BLDC Motor Torque Ripple Minimization Technique by Using Isolated Type DC–DC Buck–Boost Converter

Application of BLDC motor is gradually growing day by day in every sector. But the primary problem with BLDC motors is ripples in the torque. The main reason for torque ripples in the BLDC motor is the presence of self-inductance per phase and different rate of rising and falling current in phases at the time of commutation. This paper represents a method for minimizing torque ripples by using a closed-loop DC-DC isolated buck–boost converter (flyback converter) before inverter. PI controller is employed in the feedback to make closed loop. Using flyback converter, there is isolation between the input and output sides so that inverter switches are protected in case of any fault condition. By using PI as a feedback, steady-state errors reduced and increase stability. Analysis using MATLAB or Simulink-centered simulations verifies the characteristics and reliability of the BLDC motor drive at constant speed with closed-loop flyback converter.