Stability Improvement of the Speed Observer of Induction Motor for Electric Vehicles

This study examines the performance of an extended speed observer of an induction motor (IM) traction drive for electric vehicles (EVs). It employs an extended-speed adaptive observer with a stabilizing function to improve the low-speed stability of sensorless IMs. An approach for estimating rotor speed using machine models of multiscalar control plus the stabilizing function is used for controlling IM electric vehicle motors. The proposed speed estimator performance is compared to motor speed throughout several driving profiles of EVs, including motoring, constant speed, low and zero speed, and regenerating modes of operation. The findings show that the proposed speed observer performs well across various driving profiles. The study found that using an adaptive full-order observer for speed sensorless control in EV is effective and stable.