Permanent Magnet Synchronous Motor Sensorless Control Strategy Based on Super Twisting Sliding Mode Observer

Aiming at the problem of speed waveform overtwisting in the sensorless control system of permanent magnet synchronous motor, this paper combined the STA sliding mode controller and PI controller organically based on the Super-Twisting Algorithm (STA). A Fast Super-Twisting Sliding Mode Controller (FST-SMC) was designed, and it was verified by simulation that its resistance to load disturbance was strong and the speed waveform almost had no overmodulation. Secondly, in view of the problems of large buffering and low observation accuracy of the traditional Sliding Mode Observer (SMO), this paper introduces the super-spiral sliding mode control rate into the observer and designs a super-spiral sliding mode observer. Simulation results show that the observer designed in this paper can accurately observe the rotor position and speed. Effectively reduce buffeting, with good anti-interference ability and robustness.