Performance characteristics of switched -reluctance motor drive

...... ............... .......................................... ......................................... ......xi CHAPTER I INTRODUCTION............................. ........I 1.1 FundamentaJs of Design and Operation......................... ..........................3 1.2 Switching Circuit...................................................... .......................................7 1.3 Motivation and Objective........ ............... ......................... .......... ................10 1.4 LiteratureReview.............. ..14 1.5 Report Overview....... ................................................................. .......16 CHAPTER 2 FINITE ELEMENT SOLUTION OF ELECTROMAGNETIC FIELD.............................. .......18 2.1 FiniteElem entForm ulation........................................ ..19 2.1.1 Variational Formulation................................................ ........22 2.1.2 Derivation of Element Matrices............ ........................ ....................25 2.1.3 Matrix Assembly and Global Equations.......................... ...............28 2.2 Implementation of FE System.......... .......................................................... 30 2.2.1 Mesh Generation............. ............ ............ ................. ........... ...............30 2.2.2 Material Representation................................... ...........39 2.2.3 Data Manipulation........................................................................ .......39 2.2.4 Boundary Condition Implementation.............................. ..41 2.2.5 Solution of Global Equations................................ ............. ..............42 2.2.6 Convergence Criteria......................................................... ............. ...42 2.3 Results and Discussion................................................................................43 CHAPTER 3 METHODS AND ACCURACY OF TORQUE CALCULATION.. • •• ••• ••••• • • ♦ • ♦ ♦ • * ••• © •••*• .49 3.1 Global Virtual Work Method................. ................................ .,..,.,....50 3.2 Maxwell-Stress Tensor ....... 51 3.3 Local Virtual Work Method . .....57 3.4 Accuracy Consideration.....................,.,...........................................61 3.5 Previous Work on Torque Calculation ............ .,.....,...,........,„,......,,...65 3.6 Torque Calculation for the SRM-........ 3.7 Results and CHAPTER 4 STATIC CHARACTERISTICS AND PARAMETERS ••••••••»•••o•••••••••••• •••••••«•••«•»•••••• 4.1 Electromagnetic Energy...............---4.2 Flux Linkage.......... ..................................................... ........_________ .......97 4*3 Inductances . « ••••• ,,............................. ........ 101 4.4 Terminal Speed Voltage 4.5 Sensitivity Analysis................^l..................... ....,.,...,.,...,......,..,...,....107 CHAPTER 5 STEADY STATE PERFORMANCE OF SRM DRIVE. • • # • • • ♦ ♦ • • • ♦ •••• ♦ ♦ • • » • » • ..116 . I Control S t r s t G ^ y •••••••••••••••••••••••• *.«*.»*•«»*••«»•»»»•*»••«„»• • **»• •»•....117 5.2 Simplified Analysis .,.......,.............I.-------------------------------------.......1.20' 5.3 Switching Strategies__ ......___ _______ 5.3.1 Switching Signals................................. ...,125 5.3.2 .Angle C o n tr o l..•♦ • .• ...,,• .• .♦ * „ ,......,...,,,..,,.....,..,,...,.,; ,,,.,,1 2 7 5.3.3 Current Control(Chopping)............ ............................................127 5.4 Steady State M odel....... 5.5 Solution Method and Simulation Techniques,,.................................129 5.6 Experimental and.Simulation Results................................................130 CHAPT1ER e SUMMARY AND FUTURE RESEARCH......,........„...........189 6.1 Summary.............................................................. ......................................189 6.2 Future Research ........... .............................................. ,.190 LIST OF REFERENCES.................... ............ .......... ....................................192