Research on Regenerative Braking Torque Ripple Suppression of Brushless DC Motor

In order to suppress the regenerative braking torque ripple of Brushless DC Motor (BLDCM), two aspects considered. On the one hand, during the non-commutation of regenerative braking, puts forward a new modulation strategy PWM-OFF-PWM to avoid the non-conducting freewheeling, thus suppressing the non-commutation torque ripple caused by the non-conducting freewheeling. On the other hand, during the commutation of regenerative braking, an overlap commutation control strategy with dynamically adjustable commutation time is proposed. The non-commutation current during the regenerative braking commutation can be kept constant, thereby suppressing the commutation torque ripple caused by the non-commutation current fluctuation. The effectiveness of the proposed new strategies to suppress the regenerative braking torque ripple of BLDCM is verified by simulation and experiment.