The Research Of Direct Torque Control Method For Switched Reluctance Motor

The Switched Reluctance Motor（SRM）has many advantages, such as simple and solidstructure, high reliability, excellent performance of speed adjustment and flexible controlsystem. In recent years, it has been paid widespread attention. However, the serious torqueripple leaded by its special structure of doubly salient and operation mode is still a bigproblem. This paper has intensive studied the method of torque ripple suppress of SRM fromthe control point of view.The instantaneous torque equation of SRM has been derived from its basic mathematicalmodel, based on this equation and the Direct Torque Control（DTC）principle of inductionmotors, the DTC method applied to Switched Reluctance Drive（SRD）has been summarizedin this paper. The current amplitude and copper consumption of state stator is relatively largein the traditional fixed flux DTC speed control system with double closed-loop. To solve thisproblem, a variable flux DTC speed control system with three closed-loops has been putforward. The simulation results of Matlab indicated that the torque ripple, current amplitudeand copper consumption of SRM have been obviously reduced by using this speed controlsystem.In order to improve the control performance of SRM, the neural network PID controllerand the traditional PI controller has been composited with the consideration of characteristicsof the variable flux DTC speed control system, and the Neuron-PI controller and the BP-PIcontroller are used as the rate fixer in this paper. The simulation results shows that thesecomposited controllers can overcome the defects of single neural network PID controller,have better dynamic and static performance than the traditional PI controller, and improve theadaptive and robust of this control system effectively.This paper describes TMS320F2812DSP as the core controller, and base on thishardware experimental platform, the design and debugging work of SRD is realized. Thispaper builds the foundation for the further research, and has some value for practical operation.