Dept: Electrical and Computer Engineering ❌
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University of Windsor
1.
Lu, Xiaomin.
Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging.
Degree: PhD, Electrical and Computer Engineering, 2014, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5194 
► Recently, due to rising environmental concerns and predicted future shortages of fossil fuels, there is a movement towards electrification of the transportation industry. A…
(more)
▼ Recently, due to rising environmental concerns and predicted future shortages of fossil fuels, there is a movement towards electrification of the transportation industry. A vast majority of the current research uses
permanent magnet synchronous machines as the main traction motor in the drivetrain. This work proposes to add a special damper to a conventional
permanent magnet synchronous machine to further improve the suitability of this machine for electrified vehicles. Firstly, an equivalent circuit model is developed to simulate the operation of a conventional PMSM with a damper. A
synchronous loading test is proposed to determine the
synchronous reactance of the machine. A modified blocked rotor test is used to find the damper parameters assuming that the rotor cage construction is known. Also a single-phase AC test that can be used to determine the damper parameters without prior knowledge of the rotor construction is proposed and presented as an alternative to the blocked rotor test. Thereafter, the models of a 50 kW traction motor and the same machine with damper bars are developed and simulated. The performance of both
machines are compared and evaluated. The damper parameters are selected based on the dynamic and steady state performances. It is also shown that the machine with a damper has faster response to a three-phase short circuit fault. In addition, this study also looks into integrated charging which utilizes the existing drivetrain components for vehicle to grid and grid to vehicle operation. The damper is shown to be effective in mitigating the saliency condition caused by the buried magnets of IPMSM at stand-still condition. As a result, the machine windings can be used as line inductors for integrated charging.
Advisors/Committee Members: Kar, Narayan.
Subjects/Keywords: Damper; Electrified Vehicles; Integrated Charging; Parameter Determination; Permanent Magnet Synchronous Machines
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APA (6th Edition):
Lu, X. (2014). Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5194
Chicago Manual of Style (16th Edition):
Lu, Xiaomin. “Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging.” 2014. Doctoral Dissertation, University of Windsor. Accessed December 05, 2019.
https://scholar.uwindsor.ca/etd/5194.
MLA Handbook (7th Edition):
Lu, Xiaomin. “Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging.” 2014. Web. 05 Dec 2019.
Vancouver:
Lu X. Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging. [Internet] [Doctoral dissertation]. University of Windsor; 2014. [cited 2019 Dec 05].
Available from: https://scholar.uwindsor.ca/etd/5194.
Council of Science Editors:
Lu X. Dual Benefits of Adding Damper Bars in PMSMs for Electrified Vehicles: Improved Machine Dynamics and Simplified Integrated Charging. [Doctoral Dissertation]. University of Windsor; 2014. Available from: https://scholar.uwindsor.ca/etd/5194
University of Windsor
2.
Najafi, Shahram.
Electrical transients in permanent magnet synchronous machines.
Degree: MA, Electrical and Computer Engineering, 2006, University of Windsor
URL: https://scholar.uwindsor.ca/etd/7090
Subjects/Keywords: ELECTRICAL; MACHINES; MAGNET; PERMANENT; SYNCHRONOUS; TRANSIENTS
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APA (6th Edition):
Najafi, S. (2006). Electrical transients in permanent magnet synchronous machines. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7090
Chicago Manual of Style (16th Edition):
Najafi, Shahram. “Electrical transients in permanent magnet synchronous machines.” 2006. Masters Thesis, University of Windsor. Accessed December 05, 2019.
https://scholar.uwindsor.ca/etd/7090.
MLA Handbook (7th Edition):
Najafi, Shahram. “Electrical transients in permanent magnet synchronous machines.” 2006. Web. 05 Dec 2019.
Vancouver:
Najafi S. Electrical transients in permanent magnet synchronous machines. [Internet] [Masters thesis]. University of Windsor; 2006. [cited 2019 Dec 05].
Available from: https://scholar.uwindsor.ca/etd/7090.
Council of Science Editors:
Najafi S. Electrical transients in permanent magnet synchronous machines. [Masters Thesis]. University of Windsor; 2006. Available from: https://scholar.uwindsor.ca/etd/7090
University of Manitoba
3.
Guruwatta Vidanalage, Buddhika De Silva.
Electromagnetic design optimization of v-shaped magnet IPM synchronous machines.
Degree: Electrical and Computer Engineering, 2018, University of Manitoba
URL: http://hdl.handle.net/1993/32874
► This thesis presents an electromagnetic design optimization for the V-shaped magnet Interior Permanent Magnet Synchronous Machines (IPMSMs) and conducts a comparative study on the predicted…
(more)
▼ This thesis presents an electromagnetic design optimization for the V-shaped
magnet Interior
Permanent Magnet Synchronous Machines (IPMSMs) and conducts a comparative study on the predicted operating characteristics of the optimally designed
machines. A local optimizer (nonlinear Simplex Algorithms), a global optimizer (Genetic Algorithms) and a newly developed algorithm for multimodal design optimization are separately introduced and used to determine the dimensions of each optimized machine based on three distinctive Objective Functions. The conducted comparative study enables one to have more degrees of freedom in selecting a final design among the presented optimized designs by evaluating the performances of each machine.
A prototype of the optimized machine is fabricated, and the output power, losses, and efficiency of the built machine are assessed using experimental analysis. The experimental results for the optimized IPMSM design verify the accuracy, reliability, and effectiveness of the optimization approach and simulation analysis.
Advisors/Committee Members: Filizadeh, Shaahin (Electrical and Computer Engineering) (supervisor), Annakkage, Udaya (Electrical and Computer Engineering) Jeffrey, Ian (Electrical and Computer Engineering) Maghoul, Pooneh (Civil Engineering) (examiningcommittee).
Subjects/Keywords: Permanent Magnet Synchronous Machines; Design Optimization; Genetic Algorithms; Nonlinear Simplex Algorithm; Multi-modal Optimization; Sensitivity Analysis
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APA (6th Edition):
Guruwatta Vidanalage, B. D. S. (2018). Electromagnetic design optimization of v-shaped magnet IPM synchronous machines. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/32874
Chicago Manual of Style (16th Edition):
Guruwatta Vidanalage, Buddhika De Silva. “Electromagnetic design optimization of v-shaped magnet IPM synchronous machines.” 2018. Masters Thesis, University of Manitoba. Accessed December 05, 2019.
http://hdl.handle.net/1993/32874.
MLA Handbook (7th Edition):
Guruwatta Vidanalage, Buddhika De Silva. “Electromagnetic design optimization of v-shaped magnet IPM synchronous machines.” 2018. Web. 05 Dec 2019.
Vancouver:
Guruwatta Vidanalage BDS. Electromagnetic design optimization of v-shaped magnet IPM synchronous machines. [Internet] [Masters thesis]. University of Manitoba; 2018. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1993/32874.
Council of Science Editors:
Guruwatta Vidanalage BDS. Electromagnetic design optimization of v-shaped magnet IPM synchronous machines. [Masters Thesis]. University of Manitoba; 2018. Available from: http://hdl.handle.net/1993/32874
The Ohio State University
4.
Pina Ortega, Alejandro Jose.
Modeling and Analysis of Asymmetries in Permanent Magnet
Synchronous Machines.
Degree: PhD, Electrical and Computer Engineering, 2016, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1469034099
► The use of soft and hard magnetic materials in the construction of electric machines has become a common practice. However, demand for machines with higher…
(more)
▼ The use of soft and hard magnetic materials in the
construction of electric
machines has become a common practice.
However, demand for
machines with higher power density and
efficiency sets new challenges; new
machines require
non-conventional geometries, materials with higher energy
densities, higher operating temperatures and reliable mechanisms of
control. The
Permanent Magnet Synchronous Machine (PMSM) is one of
the key enabling technologies that have been
subject of
investigation in the past few decades because it can outperform
other types of electric
machines in a broad range of
applications.In the manufacturing of high power density PMSMs, even
small manufacturing variations can impact heavily on their
performance. The tolerances and imperfections lead to physical
machine asymmetries, and this work deals with the modeling and
analysis of these asymmetries. It is noteworthy that asymmetries
can also be introduced in the machine intentionally to enhance the
functionality in certain cases. By means of electromagnetic field
theory, analytic models have been developed in this study; Also,
numerical analysis on the basis of Finite Element Method (FEM) have
been extensively used throughout this work with the aim to validate
the results and further investigate the non-linear nature of
materials. Prototypes of Surface-Mounted
Permanent Magnet (SPM)
machines, Interior
Permanent Magnet (IPM)
machines and
Synchronous
Reluctance
Machines assisted
Permanent Magnets (PMaSynRM) were
built and tested to verify the validity of the proposed models
under loaded and unloaded conditions.The results provided by the
analytic models were considerably more time-efficient without
compromising accuracy when compared to those of FE-based models,
even when the geometries do not match perfectly owing to the
limitations of solving the model in polar coordinates.
%Discrepancies were found only when the machine goes beyond the
linear region due to the assumption of infinite permeability in the
analytic model.The analysis of radial forces showed that new
vibration modes occur due to unbalanced radial pressure, which then
introduce new resonance frequencies. Additionally, a geometry
optimized to minimize torque ripple through controlled-asymmetry
compensates harmonics in torque efficiently, but such compensation
does not occur in the same manner on radial forces. The results
suggest that neglecting the tolerances in the analysis might
underestimate the resultant torque ripple by as much as 75%. On
the other hand, when appropriately using controlled-asymmetries, up
to 90% of reduction in the amplitude of torque pulsations are
achieved. Furthermore, the effect of tolerances can be mitigated in
introducing controlled-asymmetries since both cases produce similar
harmonic orders in tangential and radial forces.
Advisors/Committee Members: Xu, Longya (Advisor).
Subjects/Keywords: Electrical Engineering; PMSM, Permanent Magnet Synchronous Machine, PMSynRM,
Permanent Magnet assisted Synchronous Reluctance Machine,
Asymmetry, Symmetry, Manufacturing Variations, Tolerances, Cogging,
Ripple, Radial Force, UMP, Unbalanced Magnetic Pulling
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APA (6th Edition):
Pina Ortega, A. J. (2016). Modeling and Analysis of Asymmetries in Permanent Magnet
Synchronous Machines. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1469034099
Chicago Manual of Style (16th Edition):
Pina Ortega, Alejandro Jose. “Modeling and Analysis of Asymmetries in Permanent Magnet
Synchronous Machines.” 2016. Doctoral Dissertation, The Ohio State University. Accessed December 05, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1469034099.
MLA Handbook (7th Edition):
Pina Ortega, Alejandro Jose. “Modeling and Analysis of Asymmetries in Permanent Magnet
Synchronous Machines.” 2016. Web. 05 Dec 2019.
Vancouver:
Pina Ortega AJ. Modeling and Analysis of Asymmetries in Permanent Magnet
Synchronous Machines. [Internet] [Doctoral dissertation]. The Ohio State University; 2016. [cited 2019 Dec 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1469034099.
Council of Science Editors:
Pina Ortega AJ. Modeling and Analysis of Asymmetries in Permanent Magnet
Synchronous Machines. [Doctoral Dissertation]. The Ohio State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1469034099
University of Windsor
5.
Kazerooni, Maryam.
New Load Demand for Electric Vehicles and Its Harmonic Impacts on Power System Distribution Transformers.
Degree: MA, Electrical and Computer Engineering, 2012, University of Windsor
URL: https://scholar.uwindsor.ca/etd/4778
► The growing concern about CO 2 emissions and dependency on foreign oil contributes to the increasing application of electric vehicles (EVs). EV battery chargers…
(more)
▼ The growing concern about CO 2 emissions and dependency on foreign oil contributes to the increasing application of electric vehicles (EVs). EV battery chargers are non-linear loads and large-scale application of EVs increases the grid harmonics significantly. The grid harmonics have negative impacts on the components of the power system including distribution transformers. In this thesis, the potentials for EVs to penetrate the transportation market are studied and the additional load demand when EV penetration achieves its full potential is estimated. Loss and thermal modeling of distribution transformers incorporating EV penetration are presented and the impacts of additional EV load demand on load loss, temperature and aging acceleration factor of a sample 100 kVA distribution transformer is estimated. The ability of the existing power system to accommodate the additional EV load demand without threatening the safe operation of distribution transformers (DTs) is evaluated based on the calculation results.
To increase the capacity of the existing power system in accommodating the new EV load demand, an optimal charging schedule based on optimization of negative impacts on DTs is proposed. In this regard, EV charging load is formulated as an optimization problem and Newton Method and Karush-Kuhn-Tucker (KKT) optimality conditions are investigated as effective optimization algorithms for solving the developed optimization problem. Using the proposed charging schedule, the impacts of EV penetration on a sample 100 kW distribution transformer is studied and the effectiveness of the proposed charging schedule is validated through a comparative study.
Moreover, this thesis investigates application of
permanent magnet synchronous motors (PMSMs) in EVs as a second approach for reducing the negative impacts of EV charging on DTs. Controlling PMSMs based on their efficiency maps contributes to increasing the efficiency of EV powertrain and consequently reducing the EV load demand. Considering the significance of accurate modeling in the control of PMSM, this thesis focuses on accurate modeling of PMSM and the sources of error in PMSM steady-state performance estimation.
Inaccuracy in the PMSM steady-state performance calculation corresponds to the parameter error and model imprecision. Accurate determination of the PMSM parameters may encounter various complications due to its rotor structure and drive design. Therefore, the PMSM performance calculation is generally vulnerable to inaccuracy because of the parameter error. This thesis studies the effect of parameter error on the inaccuracy of the performance calculations. Several methods for determining the PMSM armature resistance, flux linkage constant and d- and q-axis inductances with varying level of accuracy are proposed. The presented methods are applied to a laboratory PMSM and the sensitivity of the PMSM output power to the equivalent circuit parameters is analyzed based on the experimental results. In addition, this thesis contributes to…
Advisors/Committee Members: Narayan C. Kar.
Subjects/Keywords: Applied sciences; Distribution transformers; Electric vehicles; Load management; Optimization; Permanent magnet synchronous motor; Engineering
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APA ·
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APA (6th Edition):
Kazerooni, M. (2012). New Load Demand for Electric Vehicles and Its Harmonic Impacts on Power System Distribution Transformers. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/4778
Chicago Manual of Style (16th Edition):
Kazerooni, Maryam. “New Load Demand for Electric Vehicles and Its Harmonic Impacts on Power System Distribution Transformers.” 2012. Masters Thesis, University of Windsor. Accessed December 05, 2019.
https://scholar.uwindsor.ca/etd/4778.
MLA Handbook (7th Edition):
Kazerooni, Maryam. “New Load Demand for Electric Vehicles and Its Harmonic Impacts on Power System Distribution Transformers.” 2012. Web. 05 Dec 2019.
Vancouver:
Kazerooni M. New Load Demand for Electric Vehicles and Its Harmonic Impacts on Power System Distribution Transformers. [Internet] [Masters thesis]. University of Windsor; 2012. [cited 2019 Dec 05].
Available from: https://scholar.uwindsor.ca/etd/4778.
Council of Science Editors:
Kazerooni M. New Load Demand for Electric Vehicles and Its Harmonic Impacts on Power System Distribution Transformers. [Masters Thesis]. University of Windsor; 2012. Available from: https://scholar.uwindsor.ca/etd/4778
University of Windsor
6.
BALAMURALI, AISWARYA.
NOVEL MODELING, TESTING AND CONTROL APPROACHES TOWARDS ENERGY EFFICIENCY IMPROVEMENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR AND DRIVE SYSTEMS.
Degree: PhD, Electrical and Computer Engineering, 2018, University of Windsor
URL: https://scholar.uwindsor.ca/etd/7596
► This thesis investigates energy efficiency improvement in permanent magnet synchronous motor (PMSM) and drive system to achieve high–performance drive for practical industrial and primarily,…
(more)
▼ This thesis investigates energy efficiency improvement in
permanent magnet synchronous motor (PMSM) and drive system to achieve high–performance drive for practical industrial and primarily, traction applications. In achieving improved energy efficiency from a system level, this thesis proposes: (1) Accurate modeling and testing of loss components in PMSM considering inverter harmonics; (2) Easy–to–implement, accurate parameter determination techniques to understand variations in motor parameters due to saturation, cross–saturation and temperature; and (3) Control methodologies to improve system level efficiency considering improved loss models and parameter variations. An improved loss model to incorporate the influence of motor–drive interaction on the motor losses is developed by taking time and space harmonics into account. An improved winding function theory incorporating armature reaction fields due to fundamental and harmonic stator magnetic fields is proposed to calculate the additional harmonic losses in the PMSM. Once all contributing losses in the motor are modelled accurately, an investigation into control variables that affect the losses in the motor and inverter is performed. Three major control variables such as DC link voltage, switching frequency and current angle are chosen and the individual losses in the motor and inverter as well as the system losses are studied under varying control variables and wide operating conditions. Since the proposed loss as well as efficiency modeling involves machine operation dependent parameters, the effects of parameter variation on PMSM due to saturation and temperature variation are investigated. A recursive least square (RLS) based multi–parameter estimation is proposed to identify all the varying parameters of the PMSM to improve the accuracy and validity of the proposed model. The impact of losses on these parameters as well as the correct output torque considering the losses are studied. Based on the proposed loss models, parameter variations and the investigation into control variables, an off–line loss minimization procedure is developed to take into account the effects of parameter variations. The search–based procedure generates optimal current angles at varying operating conditions by considering maximization of system efficiency as the objective. In order to further simplify the consideration of parameter variations in real–time conditions, an on–line loss minimization procedure using DC power measurement and loss models solved on–line using terminal measurements in a PMSM drive is proposed. A gradient descent search–based algorithm is used to calculate the optimal current angle corresponding to maximum system efficiency from the input DC power measurement and output power based on the loss models. During the thesis investigations, the proposed models and control techniques are extensively evaluated on a laboratory PMSM drive system under different speeds, load conditions, and temperatures.
Advisors/Committee Members: Narayan Kar.
Subjects/Keywords: Electric motor drives; Electric Vehicles; Energy efficiency; Loss minimization; Motor control; Permanent magnet synchronous motor
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APA (6th Edition):
BALAMURALI, A. (2018). NOVEL MODELING, TESTING AND CONTROL APPROACHES TOWARDS ENERGY EFFICIENCY IMPROVEMENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR AND DRIVE SYSTEMS. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/7596
Chicago Manual of Style (16th Edition):
BALAMURALI, AISWARYA. “NOVEL MODELING, TESTING AND CONTROL APPROACHES TOWARDS ENERGY EFFICIENCY IMPROVEMENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR AND DRIVE SYSTEMS.” 2018. Doctoral Dissertation, University of Windsor. Accessed December 05, 2019.
https://scholar.uwindsor.ca/etd/7596.
MLA Handbook (7th Edition):
BALAMURALI, AISWARYA. “NOVEL MODELING, TESTING AND CONTROL APPROACHES TOWARDS ENERGY EFFICIENCY IMPROVEMENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR AND DRIVE SYSTEMS.” 2018. Web. 05 Dec 2019.
Vancouver:
BALAMURALI A. NOVEL MODELING, TESTING AND CONTROL APPROACHES TOWARDS ENERGY EFFICIENCY IMPROVEMENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR AND DRIVE SYSTEMS. [Internet] [Doctoral dissertation]. University of Windsor; 2018. [cited 2019 Dec 05].
Available from: https://scholar.uwindsor.ca/etd/7596.
Council of Science Editors:
BALAMURALI A. NOVEL MODELING, TESTING AND CONTROL APPROACHES TOWARDS ENERGY EFFICIENCY IMPROVEMENT IN PERMANENT MAGNET SYNCHRONOUS MOTOR AND DRIVE SYSTEMS. [Doctoral Dissertation]. University of Windsor; 2018. Available from: https://scholar.uwindsor.ca/etd/7596
New Jersey Institute of Technology
7.
Shi, Yuxi.
Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples.
Degree: MSin Electrical Engineering - (M.S.), Electrical and Computer Engineering, 2017, New Jersey Institute of Technology
URL: https://digitalcommons.njit.edu/theses/28
► The world’s commercial unmanned aerial vehicle (UAV) industry has witnessed unprecedented boom in recent years. Delighted with an ample supply of this excellent high-tech…
(more)
▼ The world’s commercial unmanned aerial vehicle (UAV) industry has witnessed unprecedented boom in recent years. Delighted with an ample supply of this excellent high-tech product, global consumers are paying more attention on UAVs. Civilian UAVs
Advisors/Committee Members: MengChu Zhou, Yun Q. Shi, Xiwang Guo.
Subjects/Keywords: Unmanned aerial vehicle (UAV); Permanent magnet synchronous motors (PMSM); Electrical and Electronics
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APA ·
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APA (6th Edition):
Shi, Y. (2017). Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples. (Thesis). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/theses/28
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shi, Yuxi. “Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples.” 2017. Thesis, New Jersey Institute of Technology. Accessed December 05, 2019.
https://digitalcommons.njit.edu/theses/28.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shi, Yuxi. “Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples.” 2017. Web. 05 Dec 2019.
Vancouver:
Shi Y. Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples. [Internet] [Thesis]. New Jersey Institute of Technology; 2017. [cited 2019 Dec 05].
Available from: https://digitalcommons.njit.edu/theses/28.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shi Y. Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples. [Thesis]. New Jersey Institute of Technology; 2017. Available from: https://digitalcommons.njit.edu/theses/28
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Georgia Tech
8.
Zhang, Shen.
Multi-objective design, optimization, and condition monitoring of high-performance electric machines for electric propulsion.
Degree: PhD, Electrical and Computer Engineering, 2019, Georgia Tech
URL: http://hdl.handle.net/1853/61715
► The objective of the proposed research is to develop methods for the multi-objective design, optimization, and condition monitoring of electric machines, so as to generate…
(more)
▼ The objective of the proposed research is to develop methods for the multi-objective design, optimization, and condition monitoring of electric
machines, so as to generate the optimal designs and improve machine robustness for electric propulsion. In particular, the selected high-performance electric
machines are the switched reluctance machine (SRM) with a simple and robust structure, and the interior
permanent magnet (IPM) machine with a high torque density and efficiency. For SRMs, an active current profiling technique integrated multi-objective analytical design and optimization is proposed to generate the optimal design in terms of multiple performance indices, which is proven to be accurate and time-saving, especially for a large search space with multiple prime design variables. The proposed scheme offers machine designers accurate, handy and convenient initial designs, which can be further verified or fine-tuned if necessary. The optimization process is further developed with advanced machine learning algorithms to accelerate the search process and facilitate the final decision-making process with the self-organizing map and t-SNE algorithm. To monitor the demagnetization property of the closed-loop direct torque controlled (DTC) IPMSM, two nonintrusive high-frequency signal injection schemes are proposed for PM temperature estimation via analyzing the PM electrical high-frequency resistance, which is a byproduct of the eddy current loss induced by the applied high-frequency magnetic field. The developed methods bring practical ways to excite a proper amount of high-frequency current into the stator winding, which leads to a simple, accurate, and nonintrusive
permanent magnet thermal monitoring scheme for DTC-controlled IPM
machines. The demagnetization properties of the IPM machine under the most commonly observed stator inter-turn short circuit fault is also systematically investigated via simulations and experiments, thereby offering machine designers handy information in evaluating the demagnetization fault-tolerant capability of various IPM machine design candidates.
Advisors/Committee Members: Habetler, Thomas G. (advisor), Graber, Lukas (committee member), Molzahn, Daniel (committee member), He, Lijun (committee member), Wang, Yan (committee member).
Subjects/Keywords: Electric machines; Electric propulsion; Switched reluctance machines; Interior permanent magnet machines; Optimization; Multi-objective; Demagnetization; Monitoring
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APA (6th Edition):
Zhang, S. (2019). Multi-objective design, optimization, and condition monitoring of high-performance electric machines for electric propulsion. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61715
Chicago Manual of Style (16th Edition):
Zhang, Shen. “Multi-objective design, optimization, and condition monitoring of high-performance electric machines for electric propulsion.” 2019. Doctoral Dissertation, Georgia Tech. Accessed December 05, 2019.
http://hdl.handle.net/1853/61715.
MLA Handbook (7th Edition):
Zhang, Shen. “Multi-objective design, optimization, and condition monitoring of high-performance electric machines for electric propulsion.” 2019. Web. 05 Dec 2019.
Vancouver:
Zhang S. Multi-objective design, optimization, and condition monitoring of high-performance electric machines for electric propulsion. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1853/61715.
Council of Science Editors:
Zhang S. Multi-objective design, optimization, and condition monitoring of high-performance electric machines for electric propulsion. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/61715
University of Manitoba
9.
Hunuhene Gedara, Indula Prasad Abeyrathne.
Design optimization and performance improvement of synchronous reluctance machines.
Degree: Electrical and Computer Engineering, 2019, University of Manitoba
URL: http://hdl.handle.net/1993/33999
► The performance capability of a four pole Synchronous Reluctance Machine (SynRM) is improved using an optimized coordinate based four flux barrier hyperbolic rotor structure. Firstly,…
(more)
▼ The performance capability of a four pole
Synchronous Reluctance Machine (SynRM) is improved using an optimized coordinate based four flux barrier hyperbolic rotor structure. Firstly, a study is conducted to compare and improve the operating performance of 36 slot four-pole SynRMs optimally designed based on three distinct Objective Functions (OFs) for (i) torque ripple minimization (RM), (ii) saliency ratio maximization (SM), and (iii) combined objective function (COF) optimization to simultaneously minimize the torque ripple and maximize the saliency ratio while supporting the required torque. For the optimized SynRMs, a normal round rotor and a rotor with a cut-off are used in the Finite Element (FE)-based rotor design optimization, while the stators are identically designed using classical electric and magnetic loading principles. The SynRMs’ dimensions and efficiencies are based on IEC-90S frame size limitations and IE3 efficiency standards, respectively. Secondly, two additional SynRMs with 24 slots and 48 slots are considered with normal and cut-off rotors. Four new SynRMs are optimized using appropriate COFs to minimize the torque ripple and maximize the saliency ratio of the
machines while also supporting the desired developed torque. Performance of each optimized SynRM is compared to introduce a final design. Finally to further improve performance capabilities such as developed torque, power factor and wide speed range, addition of low-cost ferrite
magnet is considered along q-axis. A different COF is used to maximize the developed torque and reduce torque ripple simultaneously for the design optimization of PM assisted SynRMs (PMaSynRMs). A comparative electromagnetic study and mechanical stress and deformation analysis are carried out to predict the performance capabilities and operating limits of the designed SynRM and PMaSynRMs. The optimally designed SynRM and PMaSynRM are fabricated and tested to verify the theoretical expectations.
Advisors/Committee Members: Filizadeh, Shaahin (Electrical and Computer Engineering), Rajapakse, Athula (Electrical and Computer Engineering).
Subjects/Keywords: Design optimization; Synchronous reluctance machine; SynRM; Finite element analysis; Permanent magnet assisted synchronous reluctance machine; Rotor design
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APA (6th Edition):
Hunuhene Gedara, I. P. A. (2019). Design optimization and performance improvement of synchronous reluctance machines. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/33999
Chicago Manual of Style (16th Edition):
Hunuhene Gedara, Indula Prasad Abeyrathne. “Design optimization and performance improvement of synchronous reluctance machines.” 2019. Masters Thesis, University of Manitoba. Accessed December 05, 2019.
http://hdl.handle.net/1993/33999.
MLA Handbook (7th Edition):
Hunuhene Gedara, Indula Prasad Abeyrathne. “Design optimization and performance improvement of synchronous reluctance machines.” 2019. Web. 05 Dec 2019.
Vancouver:
Hunuhene Gedara IPA. Design optimization and performance improvement of synchronous reluctance machines. [Internet] [Masters thesis]. University of Manitoba; 2019. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1993/33999.
Council of Science Editors:
Hunuhene Gedara IPA. Design optimization and performance improvement of synchronous reluctance machines. [Masters Thesis]. University of Manitoba; 2019. Available from: http://hdl.handle.net/1993/33999
Georgia Tech
10.
Duan, Yao.
Method for design and optimization of surface mount permanent magnet machines and induction machines.
Degree: PhD, Electrical and Computer Engineering, 2010, Georgia Tech
URL: http://hdl.handle.net/1853/37280
► Advances in electrical machinery with high efficiencies could significantly reduce the cost of industrial and residential energy systems, thereby reducing fossil fuel needs and emissions.…
(more)
▼ Advances in electrical machinery with high efficiencies could significantly reduce the cost of industrial and residential energy systems, thereby reducing fossil fuel needs and emissions. Electrical machine design is a comprehensive process based on several factors, including economic factors, material limitations, specifications and special application-dependent factors. At the same time, machine design is a multi-physics task comprising of electric design, magnetic design, insulation design, thermal design and mechanical design. However, the out-of-date conventional machine design can neither reflect the advances in the past 30 years, nor exploit the trade-offs between design factors from the multi-physics nature of the electrical machine.
This work focus on the development a fast and efficient method for the design and optimization of Surface Mount
Permanent Magnet (SMPM)
machines and induction
machines, as influenced by the energy source, mechanical loads, thermal effects, and the up-to-date developments in materials and manufacturing capabilities.
A new analytical design method is developed for the electromagnetic design of SMPM
machines. Both distributed and concentrated winding types of SMPM
machines are considered and compared. Based on the proposed electromagnetic analytical design method and a generic thermo-mechanical machine design model [1], an innovative and computationally efficient electromagnetic-thermo-mechanical integrated design method is developed for SMPM
machines. Particle Swarm Optimization (PSO) is applied in a novel way based on this integrated design method for the multi-objective design optimization of SMPM
machines. With the proposed method, the thermal and mechanical design is no longer treated separately and heuristically as in the traditional design, but has been systemically integrated with the electromagnetic design; the effect of power source, cooling capability, thermal limits, and up-to-date material capabilities are also reflected in the design and optimization. Superior designs compared to traditional designs can be achieved with PSO based multi-objective optimization. The proposed integrated design approach also has the merit of good computational efficiency and provides a significant time reduction of the design cycle compared to finite element analysis.
A novel electromagnetic analytical design method of induction
machines has been developed, which needs only six prime design variables but is able to design induction
machines in fine details. The advantage over the traditional and other existing design method is that this proposed method does not have the heuristic selection of the design variables and does not need manual design iterations. The computing time is almost negligible and the design cycle is significantly reduced compared to the tradition machine design.
Advisors/Committee Members: Harley, Ronald (Committee Chair), Divan, Deepak (Committee Member), Habetler, Thomas (Committee Member), Mayor, James (Committee Member), Taylor, David (Committee Member).
Subjects/Keywords: Design optimization; Electrical machines; Permanent magnet motors; Finite element method; Electric machinery, Induction
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APA (6th Edition):
Duan, Y. (2010). Method for design and optimization of surface mount permanent magnet machines and induction machines. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/37280
Chicago Manual of Style (16th Edition):
Duan, Yao. “Method for design and optimization of surface mount permanent magnet machines and induction machines.” 2010. Doctoral Dissertation, Georgia Tech. Accessed December 05, 2019.
http://hdl.handle.net/1853/37280.
MLA Handbook (7th Edition):
Duan, Yao. “Method for design and optimization of surface mount permanent magnet machines and induction machines.” 2010. Web. 05 Dec 2019.
Vancouver:
Duan Y. Method for design and optimization of surface mount permanent magnet machines and induction machines. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1853/37280.
Council of Science Editors:
Duan Y. Method for design and optimization of surface mount permanent magnet machines and induction machines. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/37280
Virginia Tech
11.
Vijayraghavan, Praveen.
Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives.
Degree: PhD, Electrical and Computer Engineering, 2001, Virginia Tech
URL: http://hdl.handle.net/10919/29799
► Switched Reluctance Machines (SRMs) are receiving significant attention from industries in the last decade. They are extremely inexpensive, reliable and weigh less than other machines…
(more)
▼ Switched Reluctance
Machines (SRMs) are receiving significant attention from industries in the last decade. They are extremely inexpensive, reliable and weigh less than other
machines of comparable power outputs. Although the design principles of the machine are available as a concatenation of many different sources, the need for a unified, step-by-step design procedure from first principles of electromagnetics is an absolute requirement. This dissertation discusses a procedure that can be applied by engineers with a basic background in electromagnetics. Subsequent to the design of the machine, existing finite element software can do the analysis of the machine. However, this is a laborious process and the need for an analytical method is preferable to verify the design procedure before the final verification by finite elements. The analytical procedure as well as a procedure to calculate iron losses is also developed in this dissertation. A prototype machine has been developed as an example of the design process and an existing prototype is analyzed to verify the analysis procedure.
The similarities between the SRM and the
Permanent Magnet Brushless DC Machine (PMDBC) beg the consideration of the development of a converter that can be used to drive either machine. One such converter has been developed in this dissertation. The design of the drive for both the
machines is seen to be very similar. As a consequence, a universal controller that can be used to operate both
machines has been developed and implemented with a DSP. Simulations and experimental correlation for both drives have been presented.
Advisors/Committee Members: Ramu, Krishnan (committeechair), Kachroo, Pushkin (committee member), Nunnally, Charles E. (committee member), VanLandingham, Hugh F. (committee member), Batra, Romesh C. (committee member).
Subjects/Keywords: Switched Reluctance Motor; Permanent Magnet Brushless DC Motor; Electric Machines; PMBDC; SRM
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APA (6th Edition):
Vijayraghavan, P. (2001). Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29799
Chicago Manual of Style (16th Edition):
Vijayraghavan, Praveen. “Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives.” 2001. Doctoral Dissertation, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/29799.
MLA Handbook (7th Edition):
Vijayraghavan, Praveen. “Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives.” 2001. Web. 05 Dec 2019.
Vancouver:
Vijayraghavan P. Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives. [Internet] [Doctoral dissertation]. Virginia Tech; 2001. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/29799.
Council of Science Editors:
Vijayraghavan P. Design of Switched Reluctance Motors and Development of a Universal Controller for Switched Reluctance and Permanent Magnet Brushless DC Motor Drives. [Doctoral Dissertation]. Virginia Tech; 2001. Available from: http://hdl.handle.net/10919/29799
Louisiana State University
12.
Dobzhanskyi, Oleksandr.
Study on permanent magnet transverse flux machine.
Degree: PhD, Electrical and Computer Engineering, 2012, Louisiana State University
URL: etd-04242012-160655
;
https://digitalcommons.lsu.edu/gradschool_dissertations/2872
► This dissertation is concentrated mainly on the newest PMTF machine topology proposed and patented by Jacek F. Gieras in March 4, 2010. Such a topology…
(more)
▼ This dissertation is concentrated mainly on the newest PMTF machine topology proposed and patented by Jacek F. Gieras in March 4, 2010. Such a topology (topology of 2010) is an object of this dissertation. A prototype that was built with 3D Finite Element Method (FEM) modeling of PMTF generator proves that the generator that was built on the basis of topology of 2010 has several significant disadvantages among which the greatest impact have high leakage flux losses. Applying FEM modeling, various steps to improve machine performance have been undertaken. Results obtained from modeling show, that keeping the same diameter and lengths of the machine as well as number of turns of the winding, output power of the machine can be two times higher and the negative flux linkage that is established by “inactive” PMs significantly reduced. This was achieved by introducing magnetic shunts to the stator structure. These shunts also reduce cogging torque. Modifications include changing machine stator structure, slot shape, and implementation of magnetic shunts which play a vital role in preventing flux leakage losses and reducing cogging torque. During modifications a big attention was paid to simplifying a manufacturing process. Modifications do not complicate machine design and count all aspects which may arise when manufacturing. Modified version of the PMTF machine was built by Polish manufacturer “Komel” for University of Nevada-Reno. This project was supported by National Science Foundation. The prototype results prove that the magnetic shunts block almost 70% of negative magnetic flux coming from inactive magnets. The induced voltage of the machine calculated using 3D FEM model is the same what was obtained during prototype laboratory test. However, the laboratory test also shows that if magnetic shunts are made of pure iron, generator has significant power losses. These power losses are caused by eddy currents induced on the magnetic shunts. To prevent eddy currents flowing on the magnetic shunts’ surface, instead of pure iron, laminated steel or magnetic powder has to be selected as a material for shunts. Combining the ideas of topologies [1-3] a new version of PMTF machine is introduced in this dissertation. Its electromechanical parameters are calculated. Three different designs of PMTF generator are compared in terms of output power to volume ratio.
Subjects/Keywords: magnetic shunts; electric machine; permanent magnet
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APA (6th Edition):
Dobzhanskyi, O. (2012). Study on permanent magnet transverse flux machine. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-04242012-160655 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2872
Chicago Manual of Style (16th Edition):
Dobzhanskyi, Oleksandr. “Study on permanent magnet transverse flux machine.” 2012. Doctoral Dissertation, Louisiana State University. Accessed December 05, 2019.
etd-04242012-160655 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2872.
MLA Handbook (7th Edition):
Dobzhanskyi, Oleksandr. “Study on permanent magnet transverse flux machine.” 2012. Web. 05 Dec 2019.
Vancouver:
Dobzhanskyi O. Study on permanent magnet transverse flux machine. [Internet] [Doctoral dissertation]. Louisiana State University; 2012. [cited 2019 Dec 05].
Available from: etd-04242012-160655 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2872.
Council of Science Editors:
Dobzhanskyi O. Study on permanent magnet transverse flux machine. [Doctoral Dissertation]. Louisiana State University; 2012. Available from: etd-04242012-160655 ; https://digitalcommons.lsu.edu/gradschool_dissertations/2872
University of Canterbury
13.
Youard, Timothy John.
Feasibility of an Electric Jetpack.
Degree: Electrical and Computer Engineering, 2010, University of Canterbury
URL: http://hdl.handle.net/10092/5293
► The Martin Aircraft Company Limited has been developing the Martin Jetpack for over 25 years. The recent worldwide launch of the Jetpack has enabled the…
(more)
▼ The Martin Aircraft Company Limited has been developing the Martin Jetpack for over 25 years. The recent worldwide launch of the Jetpack has enabled the company to step up its research and development programme. The goal of this project was to determine the feasibility of an electrically powered version of the Martin Jetpack. The feasibility of the Electric Jetpack was determined by researching energy storage technologies, researching power cable technologies, simulations of flight times, surveys of electric motors, and the development of a simulation program which was used to optimise some preliminary custom motor designs. The overall conclusion of this project was that the Electric Jetpack was feasible only when it was powered through a tethered power cable, and on-board energy storage was not used.
An investigation into current energy storage technologies showed that the Electric Jetpack is not considered feasible when using on-board energy storage, however it is possible to obtain flight for a very short time. The energy storage technologies studied were batteries, fuel cells, and ultra-capacitors. It was found that the best performing technology was the lithium iron nano-phosphate battery. A simulation of flight time showed that this battery type would be able to provide flight for approximately 3.6 minutes. Future trends indicated that the Electric Jetpack with on-board energy storage may eventually be feasible when using a lithium-ion based battery due to improvements being made in energy density and power density.
By using a tethered power cable, the weight of the on-board energy storage could be eliminated. This was shown to be a feasible method for powering the Electric Jetpack for applications where the Jetpack needs to only be operated in a small area. The best cable type to use was a multi-stranded flexible cable operating at a high DC bus voltage. The weight of a 5 meter power cable using a 1000 V bus voltage was shown to be 4.9 kg. Potential applications for this kind of Jetpack could include thrill rides and rescue operations from multi-storied buildings. A cable made from carbon nanotubes was shown to be a future technology that could offer a lighter cable.
A survey of currently available electric motors showed that none met both the power density and speed required by the Electric Jetpack, even when using a tethered power cable to eliminate the energy storage weight. Because of this, a custom motor design was needed. Research into motor technologies showed that the permanent magnet brushless DC (PMBLDC) motor was the most suited type for the Electric Jetpack. The permanent magnet brushless AC (PMBLAC) motor was also suitable. A PMBLDC motor simulation program was developed using MATLAB which could be used to optimise preliminary custom designs. A characterisation of allowable motor time constants for the PMBLDC motor type was made in order to speed up the simulation time.
The optimisation results showed that a power density of 5.41 kW/kg was achievable for the motor…
Subjects/Keywords: jetpack; feasibility; bldc; brushless; pmbl; pmblac; pmbldc; permanent magnet; motor; electric motor; motor design; optimization; optimisation; battery; high power density; power density; energy storage; motor simulation; lithium ion; TRV; synchronous motor; simulation program
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APA (6th Edition):
Youard, T. J. (2010). Feasibility of an Electric Jetpack. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/5293
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Youard, Timothy John. “Feasibility of an Electric Jetpack.” 2010. Thesis, University of Canterbury. Accessed December 05, 2019.
http://hdl.handle.net/10092/5293.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Youard, Timothy John. “Feasibility of an Electric Jetpack.” 2010. Web. 05 Dec 2019.
Vancouver:
Youard TJ. Feasibility of an Electric Jetpack. [Internet] [Thesis]. University of Canterbury; 2010. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10092/5293.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Youard TJ. Feasibility of an Electric Jetpack. [Thesis]. University of Canterbury; 2010. Available from: http://hdl.handle.net/10092/5293
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Louisiana State University
14.
Pratapa, Ravi Kishore.
Modeling and analysis of radial flux toroidally wound twin rotor permanent magnet motor.
Degree: MSEE, Electrical and Computer Engineering, 2010, Louisiana State University
URL: etd-04142010-181234
;
https://digitalcommons.lsu.edu/gradschool_theses/1441
► The main objective of current thesis is the study of Radial Flux Twin Rotor Permanent Magnet (RFTWTRPM) motor. The tasks were to review the literature…
(more)
▼ The main objective of current thesis is the study of Radial Flux Twin Rotor Permanent Magnet (RFTWTRPM) motor. The tasks were to review the literature about RFTWTPM motors and model the motor using Finite Element Method Magnetics (FEMM 4.0). Later the performance of RFTWTRPM motor as a brushless dc motor was analyzed by using MATLAB/SIMULINK package. To find the electrical and mechanical parameters of the RFTWTRPM motor, the rotor and stator dimensions of the motor were firstly optimized using linear FEMM model of the motor. The optimized dimensions were used to construct the cylindrical FEMM model. This model was later used to determine electrical and mechanical parameters. The electro-mechanical parameters were used in the construction of motor block diagram in SIMULINK. This block diagram was used to test the performance of the motor as Brushless DC motor was analyzed for various dynamic and steady state conditions. It was observed that the RFTWTRPM motor was highly suitable to operate as Brushless DC motor.
Subjects/Keywords: Permanent Magnet motors; FEMM 4.0; SIMULINK; Electromechanical parameters
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APA (6th Edition):
Pratapa, R. K. (2010). Modeling and analysis of radial flux toroidally wound twin rotor permanent magnet motor. (Masters Thesis). Louisiana State University. Retrieved from etd-04142010-181234 ; https://digitalcommons.lsu.edu/gradschool_theses/1441
Chicago Manual of Style (16th Edition):
Pratapa, Ravi Kishore. “Modeling and analysis of radial flux toroidally wound twin rotor permanent magnet motor.” 2010. Masters Thesis, Louisiana State University. Accessed December 05, 2019.
etd-04142010-181234 ; https://digitalcommons.lsu.edu/gradschool_theses/1441.
MLA Handbook (7th Edition):
Pratapa, Ravi Kishore. “Modeling and analysis of radial flux toroidally wound twin rotor permanent magnet motor.” 2010. Web. 05 Dec 2019.
Vancouver:
Pratapa RK. Modeling and analysis of radial flux toroidally wound twin rotor permanent magnet motor. [Internet] [Masters thesis]. Louisiana State University; 2010. [cited 2019 Dec 05].
Available from: etd-04142010-181234 ; https://digitalcommons.lsu.edu/gradschool_theses/1441.
Council of Science Editors:
Pratapa RK. Modeling and analysis of radial flux toroidally wound twin rotor permanent magnet motor. [Masters Thesis]. Louisiana State University; 2010. Available from: etd-04142010-181234 ; https://digitalcommons.lsu.edu/gradschool_theses/1441
Virginia Tech
15.
Lobo, Nimal.
Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines.
Degree: PhD, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/77978
► A new hybrid machine having variable reluctance and permanent magnets (PMs) is presented. The machine makes use of the features of a PM machine and…
(more)
▼ A new hybrid machine having variable reluctance and
permanent magnets (PMs) is presented. The machine makes use of the features of a PM machine and variable reluctance machine. The resulting machine is doubly salient and has a structure free of flux reversals. Unlike conventional doubly salient
permanent magnet machines (DSPMs), the one proposed in this report is driven by unipolar currents and uses an asymmetric converter which is used to drive switched reluctance
machines. The reason to have a new hybrid machine without the drawbacks of conventional flux-reversal-free-stator SRMs and conventional DSPMs is also described.
Conventional doubly salient
permanent magnet machines which are driven by alternating currents, do not use reluctance torque and have flux reversals in the stator iron. Homopolar flux at the peak flux density lowers hysteresis and eddy-current loss, since the machine's core operates in only one magnetizing quadrant. Due to unbalanced forces in conventional stator-flux-reversal-free
machines, their deployment in industrial and end-user applications has been hindered. The presented hybrid machine has balanced radial forces. Therefore, it maintains the advantages of conventional stator-flux-reversal-free
machines while shedding its disadvantages. The proposed machine has significantly increased power density and is more electromechanically efficient than its predecessor. A experimental prototype motor has been designed and built. Its static torque characteristics correlated well with predicted data. Experimental operation of the drive under open loop speed control shows the efficiency to be 90.8% under non-ideal driving conditions. In the current energy conscious environment and market, this motor because of its high efficiency has a significant role in reducing the energy consumption in household, industrial and automotive applications requiring electric motors.
Advisors/Committee Members: Ramu, Krishnan (committeechair), Stilwell, Daniel J. (committee member), Lindner, Douglas K. (committee member), Bose, Tamal (committee member), Prather, Carl L. (committee member).
Subjects/Keywords: Doubly salient permanent magnet motor; Switched reluctance motor
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APA (6th Edition):
Lobo, N. (2011). Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/77978
Chicago Manual of Style (16th Edition):
Lobo, Nimal. “Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines.” 2011. Doctoral Dissertation, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/77978.
MLA Handbook (7th Edition):
Lobo, Nimal. “Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines.” 2011. Web. 05 Dec 2019.
Vancouver:
Lobo N. Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines. [Internet] [Doctoral dissertation]. Virginia Tech; 2011. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/77978.
Council of Science Editors:
Lobo N. Doubly-Salient Permanent Magnet Flux-Reversal-Free-Stator Switched Reluctance Machines. [Doctoral Dissertation]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/77978
University of New Mexico
16.
Sandoval, Andrew J.
Experimental Verification of A6 Magnetron with Permanent Magnet.
Degree: Electrical and Computer Engineering, 2018, University of New Mexico
URL: https://digitalrepository.unm.edu/ece_etds/400
► A compact A6 relativistic magnetron with diffraction output using a transparent cathode, simple mode-converter, and a permanent magnet were simulated and tested at the…
(more)
▼ A compact A6 relativistic magnetron with diffraction output using a transparent cathode, simple mode-converter, and a
permanent magnet were simulated and tested at the University of New Mexico (UNM) for the Office of Naval Research. The standard compact MDO with a simple mode converter and transparent cathode radiates a TE11 mode axially through a cylindrical horn antenna. The magnetic field, essential for magnetron operation, is provided by a Neodymium Iron Boron (NeFeB) GradeN40M rare earth
magnet. The
permanent magnet eliminates the need for a pulsed
magnet and accompanying circuit, significantly reducing the size of the system. A
permanent magnetic field is also ideal for repetitive rate firing, which was demonstrated at the Naval Surface Warfare Center Dahlgren Division (NSWCDD) High Voltage Advanced Research (HIVAR) Laboratory in Dahlgren, Virginia. An extensive sweep of input parameters was simulated using MAGIC, a three dimensional particle-in-cell virtual prototyping tool to find the ideal operational parameters to be experimentally verified. A sweep of input voltages was completed experimentally using UNM’s PULSERAD accelerator in order to compare and verify simulation results. The compact MDO with
permanent magnet and transparent cathode were shipped to and assembled at the NSWCDD HIVAR Laboratory on their modulator and recommended input parameters from UNM’s simulations and experimental verification were demonstrated. Results from the experimental set up reproduced the qualitative behavior of the simulations and the simulated operating frequency of 2.5GHz was measured experimentally. The anticipated Gaussian radiation pattern from the 5 radiated TE11 mode was also experimentally verified by two ways, first by neon bulb grid array, and secondly by measuring the peak of the radiated microwave pulse relative to varying locations.
Advisors/Committee Members: Dr. Edl Schamiloglu, Dr. Christos Christodoulou, Dr. Ahmed Elfrgani.
Subjects/Keywords: magnetron; permanent; magnet; plasma; HPM; microwaves; Electrical and Computer Engineering
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APA (6th Edition):
Sandoval, A. J. (2018). Experimental Verification of A6 Magnetron with Permanent Magnet. (Masters Thesis). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/ece_etds/400
Chicago Manual of Style (16th Edition):
Sandoval, Andrew J. “Experimental Verification of A6 Magnetron with Permanent Magnet.” 2018. Masters Thesis, University of New Mexico. Accessed December 05, 2019.
https://digitalrepository.unm.edu/ece_etds/400.
MLA Handbook (7th Edition):
Sandoval, Andrew J. “Experimental Verification of A6 Magnetron with Permanent Magnet.” 2018. Web. 05 Dec 2019.
Vancouver:
Sandoval AJ. Experimental Verification of A6 Magnetron with Permanent Magnet. [Internet] [Masters thesis]. University of New Mexico; 2018. [cited 2019 Dec 05].
Available from: https://digitalrepository.unm.edu/ece_etds/400.
Council of Science Editors:
Sandoval AJ. Experimental Verification of A6 Magnetron with Permanent Magnet. [Masters Thesis]. University of New Mexico; 2018. Available from: https://digitalrepository.unm.edu/ece_etds/400
The Ohio State University
17.
Zhang, Yuan.
Sensorless Vector Control and Field Weakening Operation of
Permanent Magnet Synchronous Machines.
Degree: PhD, Electrical and Computer Engineering, 2010, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1291219704
► For the last couple of decades, Permanent Magnet Synchronous Machines (PMSMs) have attracted great attention in various industry applications such as hybrid electric vehicle…
(more)
▼ For the last couple of decades,
Permanent
Magnet Synchronous Machines (PMSMs) have attracted great attention
in various industry applications such as hybrid electric vehicle
systems, direct drive wind power generation applications, direct
drive washing
machines and servo systems etc. due to their high
power density, wide range of constant power operation and good
torque-speed response. This work focuses on developing and
implementing simple yet reliable sensorless vector control
algorithms for PM
machines for the full speed range including zero
speed. Speed or position sensors used to obtain
the rotor position information for high performance vector control
of PM
machines add more complexity to the hardware system, have
poor immunity to electromagnetic noise and reduce the reliability
of the system. Two sensorless algorithms are investigated in this
work: 1) High frequency carrier signal injection based sensorless
algorithm for zero and low speed operation; 2) Voltage model based
sensorless algorithm for the middle and high speed operation.
Initial rotor position is identified using the magnetic saturation
effect. Difference in the d- and q-axis
inductances results in additional reluctance torque in Interior
Permanent Magnet (IPM)
synchronous machines, which makes them very
suitable for operation with a constant output power over a very
wide speed range theoretically. It is known that the field
weakening control is required to achieve the constant power
operation. Literature review indicates that stable control of IPM
machines in the deep field weakening operation region still remains
an issue to achieve the largest possible speed range. A
single-current-regulator algorithm which gives a fixed command for
the q-axis voltage and only controls the d-axis current is
investigated in this work. The criteria of selecting the optimal
q-axis voltage in terms of variable speeds and load conditions are
proposed to achieve better operating efficiency and robustness of
the system in the deep field weakening operation
region. The sensorless vector control algorithms
and the single-current-regulator algorithm with optimal
<i>q</i>-axis voltage control are tested on a 50 kW IPM
machine system across the full range of speed and load to
substantiate the theoretical work.
Advisors/Committee Members: Xu, Longya (Advisor).
Subjects/Keywords: Electrical Engineering; permanent magnet synchornous machine; sensorless vector control; field weakening operationpermanent magnet synchornous
machine; sensorless vector control; field weakening operation
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APA (6th Edition):
Zhang, Y. (2010). Sensorless Vector Control and Field Weakening Operation of
Permanent Magnet Synchronous Machines. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1291219704
Chicago Manual of Style (16th Edition):
Zhang, Yuan. “Sensorless Vector Control and Field Weakening Operation of
Permanent Magnet Synchronous Machines.” 2010. Doctoral Dissertation, The Ohio State University. Accessed December 05, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1291219704.
MLA Handbook (7th Edition):
Zhang, Yuan. “Sensorless Vector Control and Field Weakening Operation of
Permanent Magnet Synchronous Machines.” 2010. Web. 05 Dec 2019.
Vancouver:
Zhang Y. Sensorless Vector Control and Field Weakening Operation of
Permanent Magnet Synchronous Machines. [Internet] [Doctoral dissertation]. The Ohio State University; 2010. [cited 2019 Dec 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1291219704.
Council of Science Editors:
Zhang Y. Sensorless Vector Control and Field Weakening Operation of
Permanent Magnet Synchronous Machines. [Doctoral Dissertation]. The Ohio State University; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1291219704
University of Windsor
18.
Yau, Michael Y. M.
Transient analysis of synchronous machines.
Degree: MA, Electrical and Computer Engineering, 1963, University of Windsor
URL: https://scholar.uwindsor.ca/etd/6339
Subjects/Keywords: ANALYSIS; MACHINES; SYNCHRONOUS; TRANSIENT
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APA (6th Edition):
Yau, M. Y. M. (1963). Transient analysis of synchronous machines. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/6339
Chicago Manual of Style (16th Edition):
Yau, Michael Y M. “Transient analysis of synchronous machines.” 1963. Masters Thesis, University of Windsor. Accessed December 05, 2019.
https://scholar.uwindsor.ca/etd/6339.
MLA Handbook (7th Edition):
Yau, Michael Y M. “Transient analysis of synchronous machines.” 1963. Web. 05 Dec 2019.
Vancouver:
Yau MYM. Transient analysis of synchronous machines. [Internet] [Masters thesis]. University of Windsor; 1963. [cited 2019 Dec 05].
Available from: https://scholar.uwindsor.ca/etd/6339.
Council of Science Editors:
Yau MYM. Transient analysis of synchronous machines. [Masters Thesis]. University of Windsor; 1963. Available from: https://scholar.uwindsor.ca/etd/6339
Virginia Tech
19.
Dalala', Zakariya Mahmoud.
Design and Analysis of a Small-Scale Wind Energy Conversion System.
Degree: PhD, Electrical and Computer Engineering, 2014, Virginia Tech
URL: http://hdl.handle.net/10919/51846
► This dissertation aims to present detailed analysis of the small scale wind energy conversion system (WECS) design and implementation. The dissertation will focus on implementing…
(more)
▼ This dissertation aims to present detailed analysis of the small scale wind energy conversion system (WECS) design and implementation. The dissertation will focus on implementing a hardware prototype to be used for testing different control strategies applied to small scale WECSs. Novel control algorithms will be proposed to the WECS and will be verified experimentally in details.
The wind turbine aerodynamics are presented and mathematical modeling is derived which is used then to build wind simulator using motor generator (MG) set. The motor is torque controlled based on the turbine mathematical model and the generator is controlled using the power electronic conversion circuits. The power converter consists of a three phase diode bridge followed by a boost converter. The small signal modeling for the motor, generator, and power converter are presented in details to help building the needed controllers.
The main objectives of the small scale WECS controller are discussed. This dissertation focuses on two main regions of wind turbine operation: the maximum power point tracking (MPPT) region operation and the stall region operation.
In this dissertation, the concept of MPPT is investigated, and a review of the most common MPPT algorithms is presented. The advantages and disadvantaged of each method will be clearly outlined. The practical implementation limitation will be also considered. Then, a MPPT algorithm for small scale wind energy conversion systems will be proposed to solve the common drawback of the conventional methods. The proposed algorithm uses the dc current as the perturbing variable and the dc link voltage is considered as a degree of freedom that will be utilized to enhance the performance of the proposed algorithm. The algorithm detects sudden wind speed changes indirectly through the dc link voltage slope. The voltage slope is also used to enhance the tracking speed of the algorithm and to prevent the generator from stalling under rapid wind speed slow down conditions. The proposed method uses two modes of operation: A perturb and observe (PandO) mode with adaptive step size under slow wind speed fluctuation conditions, and a prediction mode employed under fast wind speed change conditions. The dc link capacitor voltage slope reflects the acceleration information of the generator which is then used to predict the next step size and direction of the current command. The proposed algorithm shows enhanced stability and fast tracking capability under both high and low rate of change wind speed conditions and is verified using a 1.5-kW prototype hardware setup.
This dissertation deals also with the WECS control design under over power and over speed conditions. The main job of the controller is to maintain MPPT while the wind speed is below rated value and to limit the electrical power and mechanical speed to be within the system ratings when the wind speed is above the rated value.
The concept of stall region and stall control is introduced and a stability analysis for the overall system is…
Advisors/Committee Members: Lai, Jih-Sheng Jason (committeechair), De La Reelopez, Jaime (committee member), Nelson, Douglas J. (committee member), Meehan, Kathleen (committee member), Orlowski, Mariusz Kriysztof (committee member).
Subjects/Keywords: Wind Energy; Maximum Power Point Tracking (MPPT); Stall Control; Permanent Magnet Generators; WECS
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APA (6th Edition):
Dalala', Z. M. (2014). Design and Analysis of a Small-Scale Wind Energy Conversion System. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/51846
Chicago Manual of Style (16th Edition):
Dalala', Zakariya Mahmoud. “Design and Analysis of a Small-Scale Wind Energy Conversion System.” 2014. Doctoral Dissertation, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/51846.
MLA Handbook (7th Edition):
Dalala', Zakariya Mahmoud. “Design and Analysis of a Small-Scale Wind Energy Conversion System.” 2014. Web. 05 Dec 2019.
Vancouver:
Dalala' ZM. Design and Analysis of a Small-Scale Wind Energy Conversion System. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/51846.
Council of Science Editors:
Dalala' ZM. Design and Analysis of a Small-Scale Wind Energy Conversion System. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/51846
20.
Baktiono, Surya.
A Study of Field-Oriented Control of a Permanent Magnet
Synchronous Generator and Hysteresis Current Control for Wind
Turbine Application.
Degree: MS, Electrical and Computer Engineering, 2012, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1338314559
► Wind turbine has been popular in the area of renewable energy source. Wind turbine has shown the biggest growth in the past 10 years compared…
(more)
▼ Wind turbine has been popular in the area of renewable
energy source. Wind turbine has shown the biggest growth in the
past 10 years compared to other renewable sources.
Permanent Magnet
Synchronous Generator (PMSG) used as wind turbine generator. PMSG
is suitable for the application due to its high efficiency, high
torque-to-size ratio, and low maintenance requirement. The
intermittent characteristic of wind requires a wind turbine to have
good control system. This thesis discusses the Field Oriented
Control (FOC) and Hysteresis Current Control (HCC) technique used
to control the generator-side and grid-side respectively. In order
to perform these controls, good understanding of the PMSG and
electrical grid are required. In addition, reference frame theory
and Space Vector Modulation are explained as supplement theories
used for the Field Oriented Control. A MATLAB/Simulink simulation
has been developed to simulate the control
algorithms.
Advisors/Committee Members: Keyhani, Ali (Advisor).
Subjects/Keywords: Alternative Energy; Energy; Engineering; Wind Energy; Wind Turbine; PMSG: FOC; HCC; Field oriented control; Hysteresis current control; Permanent magnet synchronous generator
…26
3. WIND TURBINE GENERATORS (PERMANENT MAGNET SYNCHRONOUS
GENERATOR)… …33
3.3 Permanent Magnet Synchronous Generator (PMSG)… …34
3.3.1 Basic Operation of Permanent Magnet Synchronous Machine… …60
4.1.5 Permanent Magnet Synchronous Generator… …control of a Permanent
Magnet Synchronous Generator (PMSG) and Hysteresis Current…
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APA (6th Edition):
Baktiono, S. (2012). A Study of Field-Oriented Control of a Permanent Magnet
Synchronous Generator and Hysteresis Current Control for Wind
Turbine Application. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1338314559
Chicago Manual of Style (16th Edition):
Baktiono, Surya. “A Study of Field-Oriented Control of a Permanent Magnet
Synchronous Generator and Hysteresis Current Control for Wind
Turbine Application.” 2012. Masters Thesis, The Ohio State University. Accessed December 05, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1338314559.
MLA Handbook (7th Edition):
Baktiono, Surya. “A Study of Field-Oriented Control of a Permanent Magnet
Synchronous Generator and Hysteresis Current Control for Wind
Turbine Application.” 2012. Web. 05 Dec 2019.
Vancouver:
Baktiono S. A Study of Field-Oriented Control of a Permanent Magnet
Synchronous Generator and Hysteresis Current Control for Wind
Turbine Application. [Internet] [Masters thesis]. The Ohio State University; 2012. [cited 2019 Dec 05].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1338314559.
Council of Science Editors:
Baktiono S. A Study of Field-Oriented Control of a Permanent Magnet
Synchronous Generator and Hysteresis Current Control for Wind
Turbine Application. [Masters Thesis]. The Ohio State University; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1338314559
Georgia Tech
21.
Li, Sufei.
Multi-physics Modeling and Design of Switched Reluctance Machines and Large Synchronous Generators.
Degree: PhD, Electrical and Computer Engineering, 2019, Georgia Tech
URL: http://hdl.handle.net/1853/61086
► This dissertation focuses on developing multi-physics models for switched reluctance machines (SRMs) and the end regions of large synchronous generators (LSGs), so as to further…
(more)
▼ This dissertation focuses on developing multi-physics models for switched reluctance
machines (SRMs) and the end regions of large
synchronous generators (LSGs), so as to further exploit effective and efficient methods for the design optimization to improve their performances. In particular, for SRMs, a generalized and fast analytical model based on Maxwell’s equations and magnetic equivalent circuits (MECs) that predicts their electromagnetic (EM) behaviors is developed and validated by finite-element analyses (FEAs) and measured results; then, a hybrid thermal model combining 2-dimensional (2D) finite-difference (FD) formulations and thermal circuits is applied to estimate the temperature based on the loss distribution calculated by the EM model. Based on the multi-physics model, the methods of design of experiments (DoE) and evolutionary algorithms are adopted in the multi-objective optimization of SRMs. For the design of the end regions of LSGs, 3-dimensional (3D) EM and thermal models are constructed to estimate the magnetic field, loss density and temperature distributions in this region, which are verified by the agreement between the predicted and measured temperature values. To improve the computational efficiency, a harmonic quasi-3D FD formulation is developed that can provide acceptable solutions of the magnetic field and loss density distributions within a short period of time and is thus an appropriate tool for the initial design. In addition, parametric studies are performed to investigate the influences of different design parameters on the EM and thermal behaviors in the LSG end regions.
Advisors/Committee Members: Habetler, Thomas G (advisor), Saeedifard, Maryam (committee member), Mayor, James R (committee member), Graber, Lukas (committee member), He, Lijun (committee member).
Subjects/Keywords: Multi-physics modeling; Design optimization; Switched reluctance machines; Large synchronous generators; End region
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Manager
APA (6th Edition):
Li, S. (2019). Multi-physics Modeling and Design of Switched Reluctance Machines and Large Synchronous Generators. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61086
Chicago Manual of Style (16th Edition):
Li, Sufei. “Multi-physics Modeling and Design of Switched Reluctance Machines and Large Synchronous Generators.” 2019. Doctoral Dissertation, Georgia Tech. Accessed December 05, 2019.
http://hdl.handle.net/1853/61086.
MLA Handbook (7th Edition):
Li, Sufei. “Multi-physics Modeling and Design of Switched Reluctance Machines and Large Synchronous Generators.” 2019. Web. 05 Dec 2019.
Vancouver:
Li S. Multi-physics Modeling and Design of Switched Reluctance Machines and Large Synchronous Generators. [Internet] [Doctoral dissertation]. Georgia Tech; 2019. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1853/61086.
Council of Science Editors:
Li S. Multi-physics Modeling and Design of Switched Reluctance Machines and Large Synchronous Generators. [Doctoral Dissertation]. Georgia Tech; 2019. Available from: http://hdl.handle.net/1853/61086
Oregon State University
22.
VanderMeulen, Aaron H.
Novel control of a permanent magnet linear generator for ocean wave energy applications.
Degree: MS, Electrical and Computer Engineering, 2007, Oregon State University
URL: http://hdl.handle.net/1957/5921
► Wave energy conversion devices are a rapidly growing interest worldwide for the potential to harness a sustainable and renewable energy source. Due to the oscillatory…
(more)
▼ Wave energy conversion devices are a rapidly growing interest worldwide for the potential to harness a sustainable and renewable energy source. Due to the oscillatory nature of ocean waves, the power generated from a
permanent magnet linear generator (PMLG) for ocean wave energy conversion is pulsed. Focusing on direct drive technology, the PMLG directly translates the motion of the waves into electrical energy. The power generated, left unconditioned, is not easily used or stored.
With conventional diode rectification topologies, line currents can not be controlled easily, resulting in an uncontrolled generator output and force. With an active rectifier topology, the real and reactive power from the PMLG is fully controllable. This thesis will investigate the generator modeling and design of a novel three-phase active rectifier topology and force controller with a dc-dc converter for bus voltage regulation. An in depth analysis for the controller design and simulations are presented. Hardware for the three-phase active rectifier is specified and built with initial lab test results. The controller design is implemented with National Instruments’ LabView and compiled on a CompactRIO real-time controller.
Advisors/Committee Members: Brekken, Ted (advisor), Eggerton, Jimmy (committee member).
Subjects/Keywords: Permanent Magnet Linear Generator; Ocean wave power
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APA (6th Edition):
VanderMeulen, A. H. (2007). Novel control of a permanent magnet linear generator for ocean wave energy applications. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/5921
Chicago Manual of Style (16th Edition):
VanderMeulen, Aaron H. “Novel control of a permanent magnet linear generator for ocean wave energy applications.” 2007. Masters Thesis, Oregon State University. Accessed December 05, 2019.
http://hdl.handle.net/1957/5921.
MLA Handbook (7th Edition):
VanderMeulen, Aaron H. “Novel control of a permanent magnet linear generator for ocean wave energy applications.” 2007. Web. 05 Dec 2019.
Vancouver:
VanderMeulen AH. Novel control of a permanent magnet linear generator for ocean wave energy applications. [Internet] [Masters thesis]. Oregon State University; 2007. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1957/5921.
Council of Science Editors:
VanderMeulen AH. Novel control of a permanent magnet linear generator for ocean wave energy applications. [Masters Thesis]. Oregon State University; 2007. Available from: http://hdl.handle.net/1957/5921
Virginia Tech
23.
Merrifield, David Bruce.
Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor.
Degree: MS, Electrical and Computer Engineering, 2010, Virginia Tech
URL: http://hdl.handle.net/10919/76988
► The permanent magnet switched reluctance motor (PMSRM) is hybrid dc motor which has the potential to be more effect than the switched reluctance (SRM) and…
(more)
▼ The
permanent magnet switched reluctance motor (PMSRM) is hybrid dc motor which has the potential to be more effect than the switched reluctance (SRM) and
permanent magnet (PM) motors. The PMSRM has a both a salient rotor and stator with
permanent magnets placed directly onto the face of common pole stators. The PMSRM is wound like the SRM and can be controlled by the same family of converters. The addition of
permanent magnets creates nonlinearities in both the governing electrical and mechanical equations which differentiate the PMSRM from all other classes of electric motors.
The primary goal of this thesis is to develop a cohesive and comprehensive control strategy for the PMSRM so as to demonstrate its operation and highlight its efficiency. The control of the PMSRM starts with understanding its region of operation and the underlying torque production of the motor. The selection of operating region is followed by a both linear and nonlinear electrical modeling of the motor and the design of current controllers for the PMSRM. The electromechanical model of the motor is dynamically simulated with the addition of a closed loop speed controller. The speed controller is extended to add an efficiency searching algorithm which finds the operating condition with the highest efficiency online.
Advisors/Committee Members: Ramu, Krishnan (committeechair), Baumann, William T. (committee member), Lindner, Douglas K. (committee member).
Subjects/Keywords: SRM; Average Torque Control; Speed Control; PMSRM; Current Control; Permanent Magnet Switched Reluctance Motor; Firing Angle Selection Efficiency Based Control
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APA (6th Edition):
Merrifield, D. B. (2010). Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/76988
Chicago Manual of Style (16th Edition):
Merrifield, David Bruce. “Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor.” 2010. Masters Thesis, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/76988.
MLA Handbook (7th Edition):
Merrifield, David Bruce. “Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor.” 2010. Web. 05 Dec 2019.
Vancouver:
Merrifield DB. Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor. [Internet] [Masters thesis]. Virginia Tech; 2010. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/76988.
Council of Science Editors:
Merrifield DB. Control of the Doubly Salient Permanent Magnet Switched Reluctance Motor. [Masters Thesis]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/76988
Louisiana State University
24.
Gottipati, Pavani.
In-wheel Motors: Express Comparative Method for PMBL Motors.
Degree: PhD, Electrical and Computer Engineering, 2011, Louisiana State University
URL: etd-04112011-121215
;
https://digitalcommons.lsu.edu/gradschool_dissertations/3982
► One of the challenges facing the electric vehicle industry today is the selection and design of a suitable in-wheel motor. Permanent Magnet Brushless (PMBL) motor…
(more)
▼ One of the challenges facing the electric vehicle industry today is the selection and design of a suitable in-wheel motor. Permanent Magnet Brushless (PMBL) motor is a good choice for the in-wheel motor because of its lossless excitation, improved efficiency, reduced weight and low maintenance. The PMBL motors can be further classified as Axial-Flux Twin-Rotor (AFTR) and Radial-Flux Twin-Rotor (RFTR) machines. The objective of this dissertation is to develop a fast method for the selection of appropriate in-wheel motor depending on wheel size. To achieve this, torque equations are developed for a conventional single-rotor cylindrical, twin-rotor axial-flux and twin-rotor radial-flux PMBL motors with slot-less stators based on magnetic circuit theory and the torque ratio for any two motors is expressed as a function of motor diameter and axial length. The theoretical results are verified, on the basis of magnetic field theory, by building the 3-dimensional Finite Element Method (FEM) models of the three types of motors and analyzing them in magnetostatic solver to obtain the average torque of each motor. Later, validation of software is carried out by a prototype single-rotor cylindrical slotted motor which was built for direct driven electric wheelchair application. Further, the block diagram of this in-wheel motor including the supply circuit is built in Simulink to observe the motor dynamics in practical scenario. The results from finite element analysis obtained for all the three PMBL motors indicate a good agreement with the analytical approach. For twin-rotor PMBL motors of diameter 334mm, length 82.5mm with a magnetic loading of 0.7T and current loading of 41.5A-turns/mm, the error between the express comparison method and simulation results, in computation of torque ratio, is about 1.5%. With respect to the single-rotor cylindrical motor with slotless stator, the express method for AFTR PMBL motor yielded an error of 4.9% and that of an RFTR PMBL motor resulted in an error of -7.6%. Moreover, experimental validation of the wheelchair motor gave almost the same torque and similar dynamic performance as the FEM and Simulink models respectively.
Subjects/Keywords: Electric wheelchair; Comparative techniques; Twin-rotor motors; Magnetic Circuit Theory; Gearless (direct) drives of electric veh; Finite Element Modeling; Permanent Magnet Motors; Brushless Motors
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APA (6th Edition):
Gottipati, P. (2011). In-wheel Motors: Express Comparative Method for PMBL Motors. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-04112011-121215 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3982
Chicago Manual of Style (16th Edition):
Gottipati, Pavani. “In-wheel Motors: Express Comparative Method for PMBL Motors.” 2011. Doctoral Dissertation, Louisiana State University. Accessed December 05, 2019.
etd-04112011-121215 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3982.
MLA Handbook (7th Edition):
Gottipati, Pavani. “In-wheel Motors: Express Comparative Method for PMBL Motors.” 2011. Web. 05 Dec 2019.
Vancouver:
Gottipati P. In-wheel Motors: Express Comparative Method for PMBL Motors. [Internet] [Doctoral dissertation]. Louisiana State University; 2011. [cited 2019 Dec 05].
Available from: etd-04112011-121215 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3982.
Council of Science Editors:
Gottipati P. In-wheel Motors: Express Comparative Method for PMBL Motors. [Doctoral Dissertation]. Louisiana State University; 2011. Available from: etd-04112011-121215 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3982
25.
Bergstrom, John Paul.
High-speed high-power permanent magnet machine parameters, qualities, and considerations.
Degree: MSin Engineering, Electrical and Computer Engineering, 2013, University of Texas – Austin
URL: http://hdl.handle.net/2152/22747
► Permanent magnet machines have become an attractive topology for several applications due to their high power density and brushless qualities as compared to conventional wound…
(more)
▼ Permanent magnet machines have become an attractive topology for several applications due to their high power density and brushless qualities as compared to conventional wound field
machines or squirrel cage
machines. The presences of
permanent magnets provide distinct advantages, but at the same time unique behaviors that must be accounted for. Recent work has developed
permanent magnet machines for high-power and high-speed applications such as may be found in the petro-chemical industry, naval ships, and energy storage systems.
Advisors/Committee Members: Driga, Mircea D. (advisor).
Subjects/Keywords: Permanent magnets; Electrical machines; High-speed; High-power
…27
viii
Chapter 1
Introduction
Permanent magnet (PM) machines provide distinct… …and thus simplifies the rotor design. Also, the synchronous nature of the permanent
magnet… …Interior Permanent Magnet (IPM)
machines with multiple magnets used for each pole to… …Chapter 2
Permanent Magnet Materials
The first modern permanent magnets were developed in the… …such as is needed for a high quality permanent magnet. Soft
ferrites would be used for…
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APA (6th Edition):
Bergstrom, J. P. (2013). High-speed high-power permanent magnet machine parameters, qualities, and considerations. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/22747
Chicago Manual of Style (16th Edition):
Bergstrom, John Paul. “High-speed high-power permanent magnet machine parameters, qualities, and considerations.” 2013. Masters Thesis, University of Texas – Austin. Accessed December 05, 2019.
http://hdl.handle.net/2152/22747.
MLA Handbook (7th Edition):
Bergstrom, John Paul. “High-speed high-power permanent magnet machine parameters, qualities, and considerations.” 2013. Web. 05 Dec 2019.
Vancouver:
Bergstrom JP. High-speed high-power permanent magnet machine parameters, qualities, and considerations. [Internet] [Masters thesis]. University of Texas – Austin; 2013. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/2152/22747.
Council of Science Editors:
Bergstrom JP. High-speed high-power permanent magnet machine parameters, qualities, and considerations. [Masters Thesis]. University of Texas – Austin; 2013. Available from: http://hdl.handle.net/2152/22747
Georgia Tech
26.
Arnold, David Patrick.
Magnetic Machines for Microengine Power Generation.
Degree: PhD, Electrical and Computer Engineering, 2004, Georgia Tech
URL: http://hdl.handle.net/1853/4854
► This dissertation presents an investigation of miniaturized magnetic induction and permanent magnet (PM) machines, intended for use in a microengine. Similar to a macroscale turbogenerator,…
(more)
▼ This dissertation presents an investigation of miniaturized magnetic induction and
permanent magnet (PM)
machines, intended for use in a microengine. Similar to a macroscale turbogenerator, a microengine comprises a small, gas-fueled turbine engine for converting chemical fuel energy into mechanical power and an integrated electrical generator for converting mechanical power to electrical power. The microengine system is proposed as a revolutionary, high power-density source for portable electronics.
In this research, miniaturized magnetic induction
machines and PM
machines were designed, fabricated, and characterized. Both types of
machines used axially directed magnetic fields and were nominally 10 mm in diameter and 1.5-2.3 mm in thickness. Innovative microfabrication techniques were developed to demonstrate the feasibility of integrating magnetic
machines within a bulk-micromachined, silicon-based microengine system.
Two-phase, eight-pole induction
machines were constructed within silicon substrates using Cu coils in a laminated, slotted ferromagnetic NiFe or CoFeNi stator core. Silicon etching, wafer bonding, and electrodeposition were used to form all of the magnetic machine components. The induction
machines were characterized in motoring mode using tethered rotors and demonstrated motoring torques of up to 2.5 uN-m.
Also, three-phase, eight-pole, surface wound PM
machines were built using a hybrid microfabrication/assembly approach. The stators were fabricated by electroplating Cu coils on ferromagnetic NiFeMo (Moly Permalloy) substrates. The rotors were formed by assembling a magnetically patterned SmCo PM with a FeCoV (Hiperco 50) back iron. The PM
machines were tested as generators with free-spinning rotors, powered by an air-driven spindle, and demonstrated 2.6 W of mechanical-to-electrical power conversion with continuous DC power generation of 1.1 W at 120 krpm rotor speed.
The primary contributions of this work are (1) the demonstration of microfabricated magnetic
machines integrated within bulk-micromachined silicon and (2) the demonstration of multi-watt power conversion from a microfabricated PM generator. These achievements represent progress in the ongoing development of silicon-based microengines, but in addition, the fabrication technologies and device structures may find application in other microsystems.
Advisors/Committee Members: Mark G. Allen (Committee Chair), A. Bruno Frazier (Committee Member), Oliver Brand (Committee Member), Peter J. Hesketh (Committee Member), Ronald G. Harley (Committee Member).
Subjects/Keywords: Generators; Motors; Micromachining; Electrodeposition; MEMS; Micromachining; Permanent magnet motors Design and construction; Electric machinery Design and construction; Magnetic induction; Microfabrication
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APA (6th Edition):
Arnold, D. P. (2004). Magnetic Machines for Microengine Power Generation. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/4854
Chicago Manual of Style (16th Edition):
Arnold, David Patrick. “Magnetic Machines for Microengine Power Generation.” 2004. Doctoral Dissertation, Georgia Tech. Accessed December 05, 2019.
http://hdl.handle.net/1853/4854.
MLA Handbook (7th Edition):
Arnold, David Patrick. “Magnetic Machines for Microengine Power Generation.” 2004. Web. 05 Dec 2019.
Vancouver:
Arnold DP. Magnetic Machines for Microengine Power Generation. [Internet] [Doctoral dissertation]. Georgia Tech; 2004. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/1853/4854.
Council of Science Editors:
Arnold DP. Magnetic Machines for Microengine Power Generation. [Doctoral Dissertation]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/4854
Virginia Tech
27.
Rosado, Sebastian Pedro.
Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station.
Degree: MS, Electrical and Computer Engineering, 2001, Virginia Tech
URL: http://hdl.handle.net/10919/34448
► The present work studies the disturbances created in the electric system of a pumped storage power plant, which is an hydraulic generation facility where the…
(more)
▼ The present work studies the disturbances created in the electric system of a pumped storage power plant, which is an hydraulic generation facility where the
machines can work as turbines or pumps, by the operation of a static frequency converter (SFC). The SFC is used for starting the
synchronous machines at the station when in the pump mode. During the starting process several equipment is connected to the SFC being possible to get affected by the disturbances generated. These disturbances mainly include the creation of transient overvoltages during the commutation of the semiconductor devices of the SFC and the introduction of harmonics in the network currents and voltages. This work analyzes the possible effects of the SFC operation over the station equipment based on computer simulations. For this purpose, the complete system was modeled and the starting process simulated in a computer transient simulator program. The work begins with a general review of the effects of electric disturbances over high voltage equipment and in particular of the disturbances generated by power electronics conversion equipment. Then the models for the different kind of equipment present in the system are discussed and formulated. The control system that governs the operation of the SFC during the starting process is analyzed later as well as the operation conditions. Once the model of the system is set up, the harmonic analysis of the electric network is done by frequency domain and time domain methods. Time domain methods are also employed for the analysis of the commutation transient produced by the SFC operation. Finally, the simulation results are used to evaluate the impact of the SFC operation on the station equipment, especially on the generator step up transformer.
Advisors/Committee Members: Liu, Yilu (committeechair), Phadke, Arun G. (committee member), De La Ree Lopez, Jaime (committee member).
Subjects/Keywords: power system modeling; variable speed drives; frequency conversion; power transformers; synchronous machines; power system harmonics; power system transients; power quality
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APA (6th Edition):
Rosado, S. P. (2001). Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34448
Chicago Manual of Style (16th Edition):
Rosado, Sebastian Pedro. “Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station.” 2001. Masters Thesis, Virginia Tech. Accessed December 05, 2019.
http://hdl.handle.net/10919/34448.
MLA Handbook (7th Edition):
Rosado, Sebastian Pedro. “Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station.” 2001. Web. 05 Dec 2019.
Vancouver:
Rosado SP. Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station. [Internet] [Masters thesis]. Virginia Tech; 2001. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10919/34448.
Council of Science Editors:
Rosado SP. Analysis of Electric Disturbances from the Static Frequency Converter of a Pumped Storage Station. [Masters Thesis]. Virginia Tech; 2001. Available from: http://hdl.handle.net/10919/34448
Colorado State University
28.
D'Audney, Alex.
Ultra-high resolution pulsed-wire magnet measurement system, An.
Degree: MS(M.S.), Electrical and Computer Engineering, 2016, Colorado State University
URL: http://hdl.handle.net/10217/173484
► The performance of a Free-Electron Laser (FEL) depends in part on the quality of the magnetic field in the undulator. Ideally the magnetic field on…
(more)
▼ The performance of a Free-Electron Laser (FEL) depends in part on the quality of the magnetic field in the undulator. Ideally the magnetic field on the axis of the undulator is transverse to the axis and sinusoidally varying due to the periodic sequence of alternating field dipole magnets. The resulting ideal trajectory of a relativistic electron bunch traveling along the axis is also sinusoidal in the plane perpendicular to that of the ideal magnetic field. Imperfections in the magnetic field lead to an imperfect electron trajectory, both offset and angle, as well as a relative phase error between the oscillation phase of the electrons and the generated electromagnetic field. The result of such errors is a reduction of laser gain impacting overall FEL performance. A pulsed-wire method can be used to determine the profile of the magnetic field. This is achieved by sending a square-current pulse through a wire placed along the length of the axis that will induce an Lorentz-force interaction with the magnetic field. Measurement of the resulting displacement in the wire over time using a motion detector yields the first or second integrals of the magnetic field and so provides a measure of the local magnetic field strength. Dispersion in the wire can be corrected using algorithms, with a resulting increase in overall accuracy of the measurement. Once the fields are known, magnetic shims can be placed to correct the magnetic fields to the desired level. In this thesis we will describe the design, construction and testing of a pulsed-wire magnetic measurement system and use this system to characterize the CSU FEL undulator.
Advisors/Committee Members: Milton, Stephen (advisor), Biedron, Sandra (advisor), Johnson, Thomas (committee member).
Subjects/Keywords: pulsed-wire; Magnet characterization; undulator
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APA (6th Edition):
D'Audney, A. (2016). Ultra-high resolution pulsed-wire magnet measurement system, An. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/173484
Chicago Manual of Style (16th Edition):
D'Audney, Alex. “Ultra-high resolution pulsed-wire magnet measurement system, An.” 2016. Masters Thesis, Colorado State University. Accessed December 05, 2019.
http://hdl.handle.net/10217/173484.
MLA Handbook (7th Edition):
D'Audney, Alex. “Ultra-high resolution pulsed-wire magnet measurement system, An.” 2016. Web. 05 Dec 2019.
Vancouver:
D'Audney A. Ultra-high resolution pulsed-wire magnet measurement system, An. [Internet] [Masters thesis]. Colorado State University; 2016. [cited 2019 Dec 05].
Available from: http://hdl.handle.net/10217/173484.
Council of Science Editors:
D'Audney A. Ultra-high resolution pulsed-wire magnet measurement system, An. [Masters Thesis]. Colorado State University; 2016. Available from: http://hdl.handle.net/10217/173484
Louisiana State University
29.
Bhattarai, Prashanna Dev.
Study on effects of supply voltage asymmetry and distortion on induction machine.
Degree: MSEE, Electrical and Computer Engineering, 2013, Louisiana State University
URL: etd-03062013-185135
;
https://digitalcommons.lsu.edu/gradschool_theses/1955
► Performance of induction motor supplied with asymmetrical and nonsinusoidal supply voltages is studied in this thesis. Theory of induction motor is first presented for sinusoidal…
(more)
▼ Performance of induction motor supplied with asymmetrical and nonsinusoidal supply voltages is studied in this thesis. Theory of induction motor is first presented for sinusoidal symmetrical supply voltages. Equations for the torque, losses, currents and efficiency are derived. Appropriate changes are made to apply this theory to induction motors operating at nonsinusoidal and asymmetrical supply voltages. Single phase equivalent circuit of the induction motor is presented for both asymmetrical and nonsinusoidal supply voltages. The equations governing operating characteristics are presented. Machine torque, losses, current and efficiency for asymmetrical and nonsinusoidal supply voltages are compared with the same for sinusoidal symmetrical supply voltages. Computer simulation in MATLAB is used to study the impacts of asymmetrical and nonsinusoidal supply voltages on induction machines. Machine torque, losses, current and efficiency are calculated for various levels of voltage asymmetry and distortion. Results of computer simulation are presented.
Subjects/Keywords: asymmetry; distortion; machines
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APA (6th Edition):
Bhattarai, P. D. (2013). Study on effects of supply voltage asymmetry and distortion on induction machine. (Masters Thesis). Louisiana State University. Retrieved from etd-03062013-185135 ; https://digitalcommons.lsu.edu/gradschool_theses/1955
Chicago Manual of Style (16th Edition):
Bhattarai, Prashanna Dev. “Study on effects of supply voltage asymmetry and distortion on induction machine.” 2013. Masters Thesis, Louisiana State University. Accessed December 05, 2019.
etd-03062013-185135 ; https://digitalcommons.lsu.edu/gradschool_theses/1955.
MLA Handbook (7th Edition):
Bhattarai, Prashanna Dev. “Study on effects of supply voltage asymmetry and distortion on induction machine.” 2013. Web. 05 Dec 2019.
Vancouver:
Bhattarai PD. Study on effects of supply voltage asymmetry and distortion on induction machine. [Internet] [Masters thesis]. Louisiana State University; 2013. [cited 2019 Dec 05].
Available from: etd-03062013-185135 ; https://digitalcommons.lsu.edu/gradschool_theses/1955.
Council of Science Editors:
Bhattarai PD. Study on effects of supply voltage asymmetry and distortion on induction machine. [Masters Thesis]. Louisiana State University; 2013. Available from: etd-03062013-185135 ; https://digitalcommons.lsu.edu/gradschool_theses/1955
University of Texas – Austin
30.
Mackay, John Grant.
Efficient magnet configuration for low-field nuclear magnetic resonance applications.
Degree: MSin Engineering, Electrical and Computer Engineering, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/5362
► By miniaturizing instrumentation, nuclear magnetic resonance (NMR) can be brought into new domains and potentially revolutionize molecular analysis. The key towards miniaturization is using a…
(more)
▼ By miniaturizing instrumentation, nuclear magnetic resonance (NMR) can be brought into new domains and potentially revolutionize molecular analysis. The key towards miniaturization is using a small, portable
magnet while maintaining strict field homogeneity. This work presents novel annulus designs as well as implementations of the previously researched Halbach array. The annulus designs, although competitive in field strength, lack the required homogeneity for NMR applications. However, experimental results show the Halbach array has the best homogeneity of our
magnet configurations and can readily be adopted for NMR relaxometry. With modest additions, the Halbach array may also be a viable
magnet design for NMR spectroscopy. Impressive homogeneity results combined with low-cost (under $3.00), portability, and ease of construction show the presented
magnet design can make a significant impact in miniaturizing NMR devices and expanding NMR applications.
Advisors/Committee Members: Abraham, Jacob A. (advisor).
Subjects/Keywords: Nuclear magnetic resonance; NMR; Magnet configuration; Low-field magnet; Halbach array; NMR miniaturization
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APA (6th Edition):
Mackay, J. G. (2019). Efficient magnet configuration for low-field nuclear magnetic resonance applications. (Masters Thesis). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/5362
Chicago Manual of Style (16th Edition):
Mackay, John Grant. “Efficient magnet configuration for low-field nuclear magnetic resonance applications.” 2019. Masters Thesis, University of Texas – Austin. Accessed December 05, 2019.
http://dx.doi.org/10.26153/tsw/5362.
MLA Handbook (7th Edition):
Mackay, John Grant. “Efficient magnet configuration for low-field nuclear magnetic resonance applications.” 2019. Web. 05 Dec 2019.
Vancouver:
Mackay JG. Efficient magnet configuration for low-field nuclear magnetic resonance applications. [Internet] [Masters thesis]. University of Texas – Austin; 2019. [cited 2019 Dec 05].
Available from: http://dx.doi.org/10.26153/tsw/5362.
Council of Science Editors:
Mackay JG. Efficient magnet configuration for low-field nuclear magnetic resonance applications. [Masters Thesis]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/5362
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Open Access Theses and Dissertations
