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This paper deals with brushless DC position control systems of unknown external load disturbances and plant parameter variations .Such systems have a very complex dynamic characteristics and highly nonlinearity, a conventional linear control design may not assure satisfactory requirements. One promising method to improve the dynamic response of such systems is adaptive fuzzy controller (AFC) which has been proposed. The proposed AFC is inherently robust, and is based on simple rules that are derived from engineering and experimental results. Simulation results show that the proposed approach can achieve accurate velocity/position servo tracking in the presence of load disturbance and plant parameter variations. Excellent flexibility and adaptability as well as high precision and good robustness are also obtained by the proposed strategy.

DESIGN OF BRUSHLESS DC POSITION SERVO SYSTEMS USING ADAPTIVE FUZZY CONTROLLER