A Design of Sliding Mode Observer for Permanent Magnet Synchronous Motor

To solve the problem of the chattering phenomena in the conventional SMO(Sliding Mode Observer),a novel SMO was proposed based on the good properties of Kalman filter,where the sat function is adopted to substitute the sign function and the low pass filter was deleted.This new SMO can decrease the high frequency ripple of the back EMF(Induced Electromotive Force),has the advantage of no phase delay,and can simplify the structure of the SMO.Then the method of the gain in the Kalman filter was proposed.The simulation results show that the dynamic and static performances are good.