DESIGN AND IMPLEMENTATION OF A FUZZY CONTROLLER FOR A HIGH-PERFORMANCE INDUCTION-MOTOR DRIVE

A limit-cycle controlled induction motor drive with a fuzzy controller is designed and implemented. The torque and flux of the proposed drive system are regulated by the limit-cycle control technique. It follows that very quick torque response can be achieved. Since the dynamic model of this type of drive system is not easy to obtain, a fuzzy controller is developed and used in the speed control feedback loop to obtain good dynamic rotor speed response. The fuzzy algorithms in the proposed controller are systematically found from the intuition and experience about the motor drive systems. The experimental results indicate that good dynamic speed performance can be achieved by the proposed controller. Moreover, since the rotor parameters are not needed in the implementation of the drive system, and due to the inherent feature of high adaptive capability possessed by the fuzzy controller, the performance of the controlled drive system is rather insensitive to the parameter and operating condition changes.