Abstract:
These motor are extensively used in aerospace, automotive and other home appliances. These motors have winding in the stator which is excited from a separate source. The control of these motor drives is obtained using converter circuits that control the excitation of the phase by switching converter switches. The conventional converter circuit suffers from low power factor and high harmonic content which in turns affects the performance of the motor drive. The aim of the work is to develop a suitable converter circuit that would give and improved power factor and low torque ripples. Three phase asymmetrical power converter using IGBT is used in the feedback of motor to control the power factor of motor. Further for minimization of ripples in torque and optimization technique named bacterial foraging optimization is used. It takes torque in the objective function and calculate ripples; assign new values to turn on and off angle of motor. So that an optimum position to the stator and rotor of motor can be assigned. Where ripple are minimum.

Keywords: SR motor,Matlab/Simulink,3-phase power converter, IGBT,BFO optimization, torque ripple minimization