AN APPLIED APPROACH FOR SPEED ESTIMATION OF INDUCTION MOTORS USING SENSORLESS FLUX OBSERVER SYSTEM WITH SLIDING MODE FIELD ORIENTED CONTROL

In this paper a new observer model in parallel with a sliding mode concept for a field oriented control drive system is proposed to robustly estimate the rotor speed without the use of speed sensor. The proposed system takes into account the problem of stator resistance variation [16] [17]. To make the new observer robust in terms of motor parameter variations and eliminate the impact of stator resistance, the feedback correction on the output of the observer (the motor current, flux and speed) is used. The results of the comparison of the outputs of a sliding mode based drive system and the one without it are performed using Matlab/Simulink. Qualitative and quantitative results in comparison with state of the art research indicate that the proposed approach is robust with minimum estimated errors.