Shaft Position Correction Scheme Comparison for Sensorless Control PMSM based on Space State-Estimation between α-β Variance Adjustment and d-q Angle PI Regulation

This paper investigates the impact from two main shaft position-error calibration techniques for sensorless permanent-magnet synchronous motor (PMSM) drive. Of all, four state observers: the extended Kalman filter (EKF), the linear Kalman filter (LKF), the single dimension Luenberger (SDL) observer and the full-order Luenberger (FOLU) observer, are realized and compared with basic flux-linkage observer (FLO) in aspects of estimated position precision and speed dynamic response. Experimental results show the error correction type is the significant deciding factor for sensorless PMSM drives performance of position and speed