Sensorless vector control for synchronous reluctance motor
                                                     LIU Sibei, LI Feilang, YAO Wenxi, LV Zhengyu
                                      (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at the problems of designing a stable and accurate observer to achieve the full range of speed in motor sensorless control, the control structure, controller and the flux observer considering the speed estimation of synchronous reluctance motor(SynRM) were studied. After the analysis of control scheme of system under rotor position orientation, a small signal model of voltagecurrent model flux observer was established according to the mathematical model of the SynRM. The stability of the observer was analyzed, and the inherent instability characteristics was given when reversing at low speed. Matlab/Simulink simulation model was built, and the performance of the control scheme was carried out through the dSPACE experimental platform. The results indicate that the control scheme using voltagecurrent model observer is feasible at positive rotation region, and the theoretical analysis is proved by the instability of the voltagecurrent observer when the system is rotating reversely at low speed.

Key words: synchronous reluctance motor(SynRM); vector control; flux observer