PFC based SEPIC converter fed BLDC motor with torque ripple minimization approach

In this paper, a Single Ended Primary Inductor Converter (SEPIC) fed brushless dc motor (BLDCM) incorporated with a torque ripple minimization scheme is developed for enhancing the power factor at supply mains and reducing the torque ripples. By varying dc link voltage, speed of BLDCM is regulated. Generally, current ripple is responsible for the presence of ripple in commutation torque. By inserting an additional voltage source in non-commutating phase, ripple in current as well as ripple in commutation torque can also be eliminated. The proposed BLDCM drive can be designed to work with an extensive speed range management with an enhanced power quality at AC mains along with minimal torque ripples. In Matlab/Simulink environment, proposed SEPIC with torque ripple minimization method for BLDCM is developed and simulated. Finally, the effectiveness of proposed BLDCM drive is validated.