SMC with disturbance observer for high performance PMSM

This paper develops a sliding mode-based observer for load torque and parameters variations control of permanent magnet synchronous motor (PMSM) drives. A sliding mode control scheme combined with an observer is useful as a means to depress chattering and the robustness is increased. It is demonstrated that the robustness of an PMSM is improved by using the proposed observer and that the robustness is more enhanced by varying the controller parameters according to the value of the estimate of the disturbance. This paper also presents a detailed comparison of SMC controller with observer for PMSM. The observer designs the implementation aspects, and a comparative study on the extensive experimental results are given.