A closed-loop torque controlled induction motor drive system is presented which can function as a controllable source of torque with a fast dynamic response and thus it can achieve an adequate control performance. The proposed drive system includes an accurate and robust flux and torque estimator and a direct fuzzy controller to enhance the torque regulation. The proposed flux and torque estimators keep the machine field oriented and can overcome any problem created by changes in the transformation and torque ripples. The fuzzy controller can achieve an adequate control performance with a high bandwidth torque control. Simulation and experimental results are presented to show the effectiveness of the proposed drive system.
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