Methods for Detecting and Compensating Position Estimation Error Caused by Cross Saturation in Sensorless Control of SynRM

The sensorless control of synchronous reluctance motor (SynRM) based on high-frequency signal injection is susceptible to position estimation errors caused by the cross-saturation effect. Higher loads intensify cross saturation, resulting in increased position estimation errors and deterioration in control performance. This paper proposes an offline identification method for SynRM cross saturation angle based on the dual-axis high-frequency square wave voltage injection (DHFSVI) technique to enhance the sensorless control performance of SynRM at low speeds. Following that, the compensation is performed using the improved normalized cross saturation angle compensation (INCCAC) method. The compensation algorithm effectively identifies and compensates for position estimation errors induced by cross saturation, thereby enhancing the control performance of SynRM sensorless control at low-speed.