High Gain Observer Based Simultaneous Identification of Stator Resistance and Rotor Speed for Sensorless Induction Motor Drives

Aiming at the instability in sensorless induction motor drives caused by stator resistance mismatch under low speed conditions, this paper investigates a dual-parameter collaborative identification method based on adaptive high gain observer (AHGO). The method effectively addresses the system instability induced by excessive parameter sensitivity in conventional single parameter identification strategies with real-time simultaneous identification of rotor speed and stator resistance. Experimental results validate its effectiveness under various low speed operating conditions.