Research on PMSM Speed Control System Based on Improved Reaching Law

Abstract

In the research of performance optimization of permanent magnet synchronous motor speed control system, in order to solve the problems of slow starting speed, high chattering and poor robustness caused by large change of switching function in traditional exponential reaching law, an improved variable speed reaching law was proposed in this paper, based on the PMSM sliding mode variable speed control strategy. In the design process of speed controller, in order to eliminate the contradiction between large motor starting current and fast speed response, the speed error was introduced into the constant velocity term of the traditional exponential reaching law, the motion process was related to the speed of the system, which effectively solved the above problems. At the same time, the integral state variable was used to improve the control precision of the motor speed. The results of modeling and simulation in Matlab software show that the improved variable speed reaching law can better the dynamic performance of the motor speed control system.