published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

This thesis presents a design method for a switched reluctance (SR) motor to optimise torque production for two types of 3 phase 6/4 poles SRM and 8/6 poles SRM designs. SR motors require precise control to optimise the operating efficiency; two controllers are proposed and built to operate the switched reluctance motor. The primary objectives of this thesis are: • To investigate the developed torque optimization for switched reluctance (SR) motors as a function of various dimensions e.g. pole arc/pole pitch variation, stator shape variation and rotor shape variation. This investigation is achieved through the simulation using Finite Element Method (FEM), MATLAB/SIMULINK. • The two proposed controllers are designed and built to carry out the experimental testing of SRM. The most versatile SRM converter topology is the classic bridge converter topology with two power switches and two diodes per phase. The first controller consists of a Programmable Logic Controller (PLC) and the classic bridge converter, this Programmable Logic Controller uses a simple language (ladder language) for programming the application code, reliable, and contains timers. The second controller consists of a cam positioner, encoder and the classic bridge converter, this cam positioner is easy to be programmed, high-speed operation, and this cam positioner has 8 outputs. This thesis is organized as follows: Chapter 1 describes the background, the present and future trends for the SRM. This chapter shows the design, control, finite element analysis, fuzzy logic control the for a switched reluctance (SR) motor (literature review). Chapter 2 describes the theory and principle of finite element method, as applied to SR motors. Chapter 3 describes the simulation results for serious of switched reluctance motor designs by changing (_) rotor pole arc / pole pitch ratio, and (_) stator pole arc / pole pitch ratio, for 3 Phase, 6/4 Poles SRM and 4 Phase, 8/6 Poles SRM. The results are obtained through finite element method (FEM) and MATLAB-SIMULINK. Chapter 4 describes the theory of fuzzy logic controller (FLC). This chapter shows the simulation results for the FLC. Chapter 5 describes the proposed programmable logic controller (PLC), and associated hardware and software. The proposed programmable logic controller produces lower speed. The cam positioner controller produces higher speed; the experimental results for both controllers are presented and discussed. Chapter 6 describes the summary of results from earlier chapters to draw the final conclusion for the thesis. The recommendations for further research are also discussed. Appendix A describes the program code for the PLC controller. Appendix B contains a CD of photos album, video clips for the PLC controller and cam positioner controller. Appendix C shows the list of the published papers by the author, extracted from this thesis. / Doctor of Philosophy (PhD)

Appendix 1 in back pocket / 1 v. various pagings : ill. ; 27 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Electrical Engineering, 1973

Thesis (Ph.D.) -- University of Adelaide, Dept. of Electrical Engineering, 1973. / Appendix 1 in back pocket.

Thesis (Ph. D.)--University of Hong Kong, 2000. / Includes bibliographical references.

Dissertation (PhD)--University of Stellenbosch, 2006. / Bibliography. Also available via the Internet.

M.Ing. / The robust and rigid construction of the reluctance machine makes it extremely useful for high speed applications e.g. in kinetic energy storage systems. Although its rigid construction offers, a degree of high reliability, its disadvantage is its low specific output power. In this dissertation a complete new concept is considered in which the output power of a reluctance machine is increased by 55% (rectangular current fed). The optimisation of the reluctance machine output power is achieved by forming the pole profile of the rotor. The conventional rectangular rotor pole profile is changed to a triangular rotor pole profile. A twelve phase rectangular current fed reluctance machine is used to test the validity of the theory. This is done by comparing theoretical predicted results and practical results. A strong resemblance between the results indicated that this theory is a good description of the reluctance machine. In the last chapter, behaviour predictions of the reluctance machine with a conventional rotor are compared with a formed pole rotor. The output power of these results indicate that the output power of a current fed reluctance machine, will increase by 55% when using an optimally formed pole profile rotor.

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