Speed Control of Permanent Magnet Synchronous Motor Using Sliding Mode Control Combined with Equivalent Input Disturbance Control

In this paper, a sliding mode control (SMC) for the direct torque control system to control the speed of permanent magnet synchronous motor ( PMSM) is developed. In order to further suppress torque ripple, chattering and disturbance of the system, an equivalent input disturbance control (EIDC) method is adopted. Thus, a composite control strategy combining SMC and EIDC, called SMC-EIDC strategy, is proposed for PMSM speed control system. Simulation results demonstrate that the SMC-EIDC strategy has achieved a better performance with fast torque and speed responses. The strategy makes the system has less chattering, shorter settling time, and less overshoot on speed responses