A Modified Speed and Position Estimation Technique for PMSM Based on Estimation Rotating Reference Frame Model

In order to improve the speed and position estimation technique in [13], this paper presents a modified method. From [13] we found that the speed and position estimation technique, which was base on estimated reference frame, could give exceptional estimation results without several problems. Since the Extended Kalman Filter (EKF) method in [13] could not track the speed variation properly, a modification was proposed to improve the EKF method´s performance, besides a simplified EKF algorithm was adopted to make the calculation more efficient. The results of the simulation demonstrate the feasibility and effectiveness of the proposed method using Matlab/Simulink facility.