Sensorless Control Strategy for IPMSM Based on Extended EMF models Considering Parameter Variation

A sensorless control method based on novel extended electromotive force models considering parameter variation is proposed for the interior permanent magnet synchronous motor(IPMSM). Based on the variation of inductance parameters, the function relation between inductance parameters and stator current is introduced into the dynamic equation of motor, and the motor model considering parameter variation is derived. The extended EMF in the rotating reference frame is estimated by a least-order observer, and the estimation position error is obtained from the extended EMF. The proposed system is very simple and easy to design. The simulation results of the traditional control algorithm and the proposed control algorithm are compared. Verify the feasibility, reliability and convergence of the proposed control strategy.