Speed control of Permanent Magnet Synchronous Motor using Power Reaching Law based Sliding Mode Controller

摘要

The Permanent Magnet Synchronous Motors (PMSM) are high-performance electromechanical motion devices essentially superseding traditional dc servomotors and fractional horsepower induction machines because of their high performance capability. The necessity for high performance in PMSM systems increases as the demand for precision controls. In order to optimize the speed-control performance of the PMSM system with different disturbances and uncertainties, a nonlinear speed-control algorithm for the PMSM servo systems using sliding-mode control is developed in this paper. A sliding-mode controller is designed based on conventional reaching law but the amount of chattering and reaching time are high. So a sliding mode controller is designed based on single power rate reaching law and double power rate reaching law methods. These methods improve the performance significantly. A comparison is made between PMSM servo system designed using Proportional Integral (PI) controller and sliding mode controllers designed based on different reaching law methods.