DOUBLE FUZZY-PI CONTROLLER BASED SPEED CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTOR
In high performance industrial application, Permanent Magnet Synchronous Motor (PMSM) becomes the main competitor for AC motor. PMSM has some advantages such as high efficiency, small size, high power density, large torque to inertia ratio, and low maintenance. PMSM is also very popular compared to DC motors in applications of machine tools, servo and robots, electric vehicle, and ship propulsions. Speed control of PMSM widely uses the conventional proportional integral (PI) controller, but PI controller has difficulty in speed changes, parameter variations and load disturbances. This paper presents double fuzzy logic controllers to tune the parameters of PI controller applied in the speed control of PMSM. Double fuzzy-PI (DFPI) controller is verified using simulation process for normal and disturbance conditions. DFPI controller has better performance compared to the conventional PI controller during change of operating condition. Simulation results of DFPI controller show that PMSM quickly achieve the speed reference, has small steady state error, no overshoot and reduce the speed oscillation during load disturbance condition.