Sensorless Control of PMSM Based on High Order Sliding Mode
The sensorless control of traditional permanent magnet synchronous motor(PMSM)is charac-terized by large overshoot,obvious chattering and easy to be affected by load disturbance.A control strategy based on high order sliding mode is proposed,and a new high order sliding mode controller is designed by combining the super-twisting algorithm(STA)and any order algorithm.The new controller is applied to the speed controller,state observer and torque observer respectively.Replace the sign function with the satu-ration function,and the integral sliding mode surface and fuzzy control are used to optimize the control sys-tem.The rotor position information is obtained by the state observer and phase locked loop(PLL),and the observed value of torque observer is fed forward to the speed controller.The simulation results show that the high order sliding mode control system can effectively weaken overshoot and chattering,improve the ac-curacy of rotor position estimation,and greatly improve the anti-interference and robustness of the system.
PMSMsensorless controlhigher order sliding modestate observertorque observer