A FUZZY CONTROLLER IMPROVING A LINEAR-MODEL FOLLOWING CONTROLLER FOR MOTOR-DRIVES

Since the dynamic response trajectory of a traditional fuzzy controller can not be quantitatively controlled, a fuzzy model following controller is proposed in this paper. In the proposed controller, an output feedback linear model following controller (LMFC) is first designed according to the roughly estimated plant model to let its response follow the output generated by a reference model Then a model following error driven control signal is synthesized such that good model following characteristics can be preserved at various operating conditions. The proposed controller is applied to the speed control of an induction motor drive. Dynamic signal analysis of the model following behavior is made and the procedure for constructing the control algorithms is detailedly described. The performance of the drive and the effectiveness of the proposed controller are demonstrated by some simulated and experimental results.