Adaptive position estimation and control for permanent magnet synchronous motor

In this paper, a sensorless technology based on adaptive estimation is presented for the full-speed range control of a permanent magnet synchronous motor, where the traditional mechanical sensor is replaced by estimating the motor position and speed. The motor initial position is detected by using a rotating high frequency voltage injection method, and the motor speed is estimated by adjustable model method. The error of the rotor initial position is smaller than 0.2 % and the rotor speed estimation error is controlled within 0.7%.