Aiming at the problem of flux observation in high performance control of induction motor

a fractional order integral rotor flux sliding mode observer based on the improved law with Faln function is designed.Fractional-order integral sliding surface and improved Faln function are used as approximation function in slidingmode observers. And rotating speed is estimated through the flux observer. Simulation results show that the fractional order integral sliding mode observer with improved reaching law can effectively improve the observational precision and dynamic response performance. And chattering in sliding mode observations is suppressed

precision of speed estimation through flux observer is high.