Research on Rotor Position Estimation Method of Sensorless Permanent Magnet Synchronous Motor

P212 sensor will increase the cost of the motor control system, reduce the reliability and performance of the system, and it's difficult to implement in some bad conditions. This paper presents a rotor position real-time estimation method for permanent magnet synchronous motor. The rotor position estimation is corrected by the position characteristic points obtained by back electromotive force. It will improve the accuracy and reliability of rotor position estimation. Experimental results show that the method proposed in this paper can estimate the rotor position information in real time and achieve the vector control of the motor without position sensor. This method is easy to implement, real-time, and the system runs stably.