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Abstract

This paper presents a BLDC motor drive system using modified Staircase PWM (SCPWM). Based on the hall position sensor signal, the controller generates Staircase PWM to drive the BLDC motor. Because it’s SCPWM instead of Sine PWM signal, minimize pulsation torque ripple is more efficiently at various speeds. The BLDC motor has the advantage of being a special electrical machine and high power applications a staircase modulation, also known as selective harmonic elimination based method, has been proposed. This method is used to reduce the switching losses to a minimum value and to improve the efficiency of the inverter. Finally, the simulation and experimental results are presented to minimize pulsation torque ripple of the BLDC drive system.