Abstract

Th e brushless DC motor is widely used in industrial application for its different advantages over other conventional motors, however high performance motor drives require fast and accurate speed response of the system, quick recovery of speed from any disturbance and sensitivity to motor parameters variation. To operate the motor with proper reference speed different controllers are used in industrial application. In this work a comparative study on performance of different controllers for speed control of BLDC (Brushless DC) Motor is presented. A Fractional order fuzzy-PID (FOFPID) controller is developed based on fractional calculus and fuzzy technology. Performance of the BLDC motor using FOFPID is observed and compared with the classical PI, PID and fuzzy-PI controllers in terms of rise time, peak overshoot and settling time. Different conditions are considered to check the performance of motor (viz. fixed load & fixed reference speed to study basic performance of motor, time varying reference speed & fixed load to study dynamic performance of motor and time varying load & fixed reference speed to study the disturbance rejection capability of motor) . MATLAB/SIMULINK environment is used to carry out the following investigation.

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