Research On DSP Based Control System Of Switched Reluctance Motor

Switched reluctance motor (SRM) has only a short history of 30 years, but has already won a important position in the field of electric drive due to its good performance in speed adjustment, and has a bright future. But in performance analysis, design and control, there are still some problems to be resolved, such as the dependence on the position sensors, comparatively serious torque ripple, vibration and noise, which limit its further application. This paper developed a control system for a 4-phase 8/6-pole SRM of 3 kW based on TMS320LF2407 DSP, which can be used for the technical research on SRM control.The thesis contains six parts. The first part summarizes the development and research of switched reluctance drive (SRD), discusses the main research direction, and explains the main work in this paper. In part 2, the structure of SRM, operation principle, and the position sensing technique are elaborated and analyzed. Part 3 does the research on the structure and design of power converter, adopts IGBTs as the power switch and designs a power converter for a 4-phase 8/6-pole SRM of 3 kW. In part 4, TMS320LF2407 DSP is used to design the hardware circuits of SRM control system, and design details including the current detection, position sensing, fault protection and power supply etc. are provided. Because of the full use of the abundant peripheral resources of DSP, it comes to the aim simplifying the circuit structure and heightening the reliability. Part 5 discusses the routine designing issue. Because the modularized programming method is adopted, and multi-interrupt processing technique is used, operation efficiency of the control software is highly raised. At the last, the foregoing SRM control system is tested. Speed adjustment is realized, and other targets on the research and design of SRM control system are reached, which establishes a good foundation for further research.