A SMO Based Position Sensorless Permanent Magnet Synchronous Motor Control Strategy

The position sensors are necessary for the permanent magnet synchronous motors(PMSM) in order to obtain the position feedback information, while also increasing the integrated system cost and the spatial occupancy, therefore, the research work for new type of position sensorless PMSM become a mainstream. The key technology of the new type motor is to obtain the position information without the position sensor. This paper proposes an improved sliding mode observer(SMO) based control strategy for PMSM. By using the improved SMO, the position and speed information can be estimated and used to form a complete closed loop control system. Real time simulation of the proposed scheme is performed through a semi-physical simulation platform to verify the effectiveness of the proposed control strategy.