Study On Digital Control Technique Of Doubly Salient Electro-Magnetic Motor Control System

Doubly Salient Electro-Magnetic Motor is potentially a good candidate for future motor applications because of its unique structure and outstanding electrical characteristics. The new motor is a kind of brush-less motor with many competitive advantages. This thesis studies Doubly Salient Electro-Magnetic Motor control system from five perspectives: the basic theory, modeling and stimulation, torque ripple analysis and the digital control technique implement.Firstly, this thesis introduces the basic structure, static characteristic and the operation principle of Doubly Salient Motor. Then, this thesis analyzes three control modes carefully and compares them to show the advantages and disadvantages of each mode. With the help of MATLAB/PSB(Power System Block) toolbox, the thesis introduces a new way to model the motor and the system. Many theories in this thesis are stimulated on this model. The torque ripple of Doubly Salient Electro-Magnetic Motor is thoroughly studied. The thesis analyzes the reasons of torque ripple and relationship between torque ripple and system parameters. Means to minimize torque ripple are developed. The last part of this thesis describes a digital implement of Doubly Salient Electro-Magnetic Motor control system base on a Digital Signal Processor (DSP). The thesis gives a detailed hardware and software design of this system. A prototype of this digital control system is set up. The experiment results are obtained on the prototype, which prove that the theories and analysis are correct.As a supplement to the thesis, the affection of mutual induction on the current characteristic of Doubly Salient Permanent Magnetic Motor is also studied.