Overall Torque Ripple Reduction by Constant Band Hysteresis Current Controller with Back EMF Phase Shift Error Compensator in BLDC Motor Drive

Abstract

Torque ripple is always problematic in BLDC motor drive. The torque ripple particularly during commutation period is significant and caused mostly by nonequal but opposite commutation phase current rate as well as back electromotive force (EMF) phase shift. In this paper, a constant band hysteresis current controller with back EMF phase shift error compensator for the brushless DC (BLDC) motor is presented to minimize the overall torque ripple. The detailed proposed technique is elucidated and the performance is verified via Matlab/Simulink simulation and the experimental results respectively.