Research on Speed Identification of Induction Motor Based on Sliding Mode Observer

An improved integral sliding mode observer in this paper is proposed for speed identification in induction motor, compared with traditional sliding mode observer, the steady-state error and buffeting of the control system are reduced, and the integral saturation is effectively suppressed. Based on the phase-locked loop decoding technique, the rotor position angle is calculated. The system has a good performance in speed tracking and has a satisfied accuracy of identified speed in full speed range. Finally, the correctness of the speed identification strategy proposed in this paper is verified by simulation and experimental study.