Sensorless Control of Permanent Magnet Synchronous Motor Based on Sliding Mode Controller

Aiming at the high cost of using mechanical sensors in permanent magnet synchronous motor (PMSM), a motor speed estimator based on model reference adaptive system (MRAS) is designed to realize sensorless control, so as to reduce the cost and obtain the accurate rotor position of PMSM; for the actual system, the speed outer loop adopts proportional integral (PI) controller, which is vulnerable to system parameter changes, load disturbance and external disturbance, the sliding mode controller is designed to solve the problems of load disturbance. Its biggest advantage is that it is insensitive to disturbance and parameters, fast response, and improves the robustness of the system to a certain extent. The simulation results show that the proposed control system can accurately control the motor speed to follow the set value, effectively improve the detection accuracy of the system, and the sliding mode control of speed outer loop has better dynamic performance than PI control.