Sensorless Control of Induction Motors based on High-Gain Speed Estimation and On-Line Stator Resistance Adaptation

Stator resistance adaptation is a crucial issue in sensorless control of induction motor, particularly at low speed. In this paper, an improved indirect field oriented controller based on high gain speed estimation, which was previously proposed by the authors, is deeply revised in order to add a stator resistance adaptation mechanism. Simplicity and easy-to-tune structure of the non-adaptive version of the controller is preserved, while its robustness is significantly improved thanks to stator resistance estimation. Experimental results are provided to show the effectiveness of the proposed method.