Sensorless control of permanent magnet synchronous motor based on sliding mode adaptive system

The traditional mechanical encoder has been used to detect the position and speed of rotors in permanent magnet synchronous motor control system, which has the problems of high cost, low system reliability, being susceptible to interference and difficult to apply in a complex environment. A novel speed estimation method based on sliding mode adaptive system is proposed in this paper, which improves the speed estimation accuracy and system robustness to achieve motor speed sensorless control. The simulation results indicate that the control strategy could avoid the limitations of traditional mechanical encoders, and estimate the rotor speed and position angle accurately when suddenly applied load