A Sliding Mode Observer Based Sensorless Controller

Permanent magnet synchronous motor (PMSM) on the one hand has simple structure, high dependably, on the other hand has high efficiency, high power factor and so on advantages. Compared with induction motor, PMSM has better speed regulation performance. Thus, it is frequently applied in a variety of speed occasions and control conditions. PMSM generally uses Hall sensor to sample the position and speed information of the motor and realize the closed-loop control of the motor. But Hall sensor limits partly the development of the motor. The control strategy without position sensor can remove this limitation. Among many insensibility control strategies, the sliding mode observer method is robust and simple to implement.