Chang-hee Won, Joong-Ho Song, and Ick Choy, “Commutation Torque Ripple Reduction in Brushless DC Motor Drives Using a Single DC Current Sensor,” in Proc. PESC Conf., Jun. 2002, pp. 985–990. > Paper

This paper presents a comprehensive study result on reducing commutation torque ripples generated in brushless dc motor drive

with only a single dc-link current sensor provided in the inverter dc-link. In brushless dc motor drives equipped with only a single

current sensor, it seems that commutation torque ripple suppression which is practically effective in low speed as well as high speed

regions has not been reported. A proposed commutation compensation technique combined with deadbeat dc-link current

controller is based on a strategy that the current slopes of the incoming and the outgoing phases during the commutation interval

can be equalized by a proper duty-ratio control. The proposed control method is verified through simulations and experiments.