Sliding mode control of permanent magnet synchronous motor
Permanent Magnet Synchronous Motor (PMSM) is a widely used motor because of its small size, high efficiency, reliable operation and good speed regulation. The reliable application of PMSM's sensorless control technology in industrial control relies on high-precision estimation of motor speed and position signal. In order to obtain accurate motor speed and position, it is necessary to accurately obtain the motor back EMF. The main strategies proposed at present are: 1 Motor model open-loop estimation, 2 high-frequency signal injection method 3 based on detecting back-EMF estimation speed position method 4 model reference adaptive estimation method 5 state observer estimation method [1]. Among them, the strategy based on sliding mode variable structure control and state observation has better accuracy and robustness in motor speed and position estimation. The sliding mode observer method is a closed-loop observer method. It is based on the principle of sliding mode variable structure, and uses the estimated deviation to design the sliding mode control mechanism, forcing the state of the system to finally stabilize on the designed sliding mode hyperplane, which can improve the system. Accuracy, rapidity and robustness of parameter estimation [2]
