Terminal sliding mode control (TSMC) strategy was applied to permanent magnet synchronous motor (PMSM) position control to improve system output response performance.Based on the terminal sliding mode technology,a novel disturbance observer was designed to estimate the collective uncertainty of PMSM,including system parameter uncertainty and unknown external load.Unlike the asymptotic convergence controller,the TSMC guarantees the system state error and observer estimation error can be converged to zero in a finite time.The results show that compared with PID control and traditional backstepping control,the control effect of the proposed controller is better.