Minimization of torque ripple in the BLDC drive using a high performance novel switched inductor QZS converter

Abstract Torque ripples during commutation are a significant problem that occurs during speed changes and transitions in brushless direct current (BLDC) drives because the incoming and outgoing phase currents fluctuate at different rates simultaneously. These ripples on the rotor side cause noise and mechanical pulsation. Moreover, the higher input current ripple leads to significant switching stress and losses throughout the switching operation. This article proposes a topology that reduces commutation current and torque ripples by adjusting the motor’s input voltage to four times the back EMF amplitude of the motor. The proposed topology incorporates a switched inductor QZS DC-DC converter at the front of a three-phase voltage source inverter, offering high voltage gain while minimizing the voltage ratings of the DC supply. The circuit for DC Link voltage has been integrated into the system to ensure the required input DC voltage is obtained during the commutation phase. The novel topology being examined has been developed utilizing the MATLAB/Simulink software. The simulation results demonstrate that the proposed module reduces commutation current and torque ripples to 13.5% and 7.5% respectively. This illustrates the efficacy of the proposed system.