A new adaptive sliding mode observer based PLSM sensorless control motors

To improve the permanent magnet synchronous motor without position sensor control system, this paper puts forward a new adaptive sliding mode observer to estimate rotor position and rotating speed, the observer is constructed a new type of switching function instead of traditional symbol function, don't have to make control system with low pass filter and phase compensation module can obtain a smooth line back emf waveform measurements, and then get the rotor position. Based on Lyapunov, Lyapunov stability theory, designed based on model reference adaptive algorithm to estimate speed, the adaptive algorithm is not affected by the switching ripple. In this paper, the proposed method can accurately estimate the rotor position and speed, effectively restrain the torque ripple, improve the stability, rapidity and robustness of the whole system.