Research on the sliding-mode variable structure control based on the vector control of PMSM

Based on the vector control system of permanent magnet synchronous motor (PMSM), an integral Variable Structure Control (VSC) is designed in this paper through the application of variable structure control theory with sliding mode. Furthermore, by means of Matlab / Simulink, a simulation analysis on the control structure is performed to examine the effects of different parameters on the system performance. In view of the defect that a VSC would vibrate with high frequency around the sliding-mode origin, this paper introduces a method which integrates traditional PID with VSC for an improvement of the stability of the control system.