Novel space-vector current-control method for torque ripple reduction of brushless DC motor based on three-level neutral-point-clamped inverter

Abstract

In this paper, a novel current controlled space-vector pulse width modulation (CCSVPWM) technique for reducing torque ripple in a three-level neutral-point-clamped (NPC) inverter fed trapezoidal brushless direct current (BLDC) motor is proposed. In BLDC motor, the different current slew rates between switching-in and switching-out phase generate current ripple, further leading to the generation of commutation torque ripple in the commutation interval. In the proposed method, CCSVPWM method has been applied to the three-level NPC inverter fed trapezoidal BLDC motor, current ripple and so commutation torque ripple suppressed. The proposed novel control scheme for torque ripple reduction is confirmed by dynamic simulation and it can be used to minimize the torque ripple more efficiently.