Torque Ripple Suppression of Brushless DC Motor Under an Improved Segmented PWM

This paper mainly describes a segmented PWM control method to minimize commutation torque ripple to achieve smooth operation of the motor at high and low speeds. The reasons for commutation torque ripple generated by brushless DC motors in three-phase six-state and two-phase conduction mode were analyzed. and a commutation torque ripple suppression strategy under ON-PWM modulation is proposed. This strategy considers the influence of the change of back EMF on the torque ripple during the commutation process, and further improves the compensation effect of commutation torque ripple, so as to realize the low torque ripple operation of the motor at low speed and high speed. By establishing a system simulation model in Matlab/Simulink environment, it is confirmed that the new control strategy can effectively reduce the commutation torque ripple, and verify the effectiveness and theoretical correctness of the control method.