Vol. 159, Issue 11, November 2013, pp. 190-197

Abstract: The stability and accuracy of induction motors is seriously influenced by the flux observer. The improvement of motor is restricted by the sensitivity of traditional open-loop current and voltage flux observer to the motor parameter under low or high speed. In order to improve the accuracy and stability of flux observer, a novel close-loop flux observer is implemented, which include the current and voltage flux observer cooperated with phase-compensated transition function. The accuracy and insensitivity to motor parameter are insured in the whole speed range; what's more, the deadbeat stator current observer is added to solve the one sample cycle delay. By the observer characteristic function being utilized to analysis flux observer, along with the simulation and experiment, the accuracy and stability are verified.

Keywords: Hybrid flux, Motor parameter, Sensitivity, Transition function, Deadbeat, Current observer.

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