Novel composite sliding mode control for PMSM system based on disturbance observer

This paper mainly studies the sliding mode control strategies for the speed regulation of permanent magnet synchronous motor (PMSM) system. A new nonsingular terminal sliding mode control (NTSMC) strategy is designed based on vector control theory, which is adopted in the speed loop. Meanwhile, a disturbance observer is proposed to reduce chattering. Through disturbance estimation for feed-forward compensation, one new composite NTSMC (CNTSMC) algorithm has been proposed to take a smaller value for the switching gain without large chattering. It is fully verified by comprehensive simulation and experiments as available in the full paper.