An AC motor closed loop performances with different rotor flux observers

This paper deals with robust flux observation of an induction motor using both an analytical observer and an artificial intelligence based one. Each developed observer is used in the direct field oriented control scheme of a 30kW induction machine. The effectiveness of the proposed schemes is checked via simulations on an induction motor driven by a space vector voltage-source pulse width modulation (PWM) inverter. The corresponding results of the method combining optimal regulator with neuralnetwork estimator are compared with those achievable with the standard PI control and a classical Luenberger observer. Computer simulations and experimental tests are presented to highlight the effectiveness of two proposed observers.