A nonsingular terminal sliding mode position control strategy for permanent magnet linear synchronous motor based on disturbance observer is proposed in this paper. In this strategy, a disturbance observer is introduced into the sliding mode surface, which is used to observe the mismatched/matched disturbances to ensure the PMLSM system is robust to mismatched disturbances and matched disturbances. The feedback q axis current is integrated into the position controller to realize the overall control of the motor position, speed and current, which can make the motor position fast tracking without overshooting, and improve the dynamic performance and steady-state performance of the system. Experimental results verify the feasibility of the proposed control strategy.

Linear motor ，nonsingular terminal sliding mode control，Position control，Disturbance observer