Performance of BLDC Motor Speed Control Based on Hysteresis Current Control Mechanism

Abstract

Brushless dc (BLDC) motor has been widely used for daily life due to has high ratio of torque, wide range of speed regulation and high efficiency compared to conventional dc motor. However, BLDC motor cannot be operated independently and needs electronic devices to control both its speed and torque. Usually, three phase inverter is required to generate commutations based on the position of rotor. Due to high frequency switching in the inverter side causes harmonic problems which affects the poor value of power factor (PF). In this paper implements hysteresis current control method in the bridgeless isolated cuk (BIC) converter topology in order to control the speed of BLDC motor and improving of power factor. From simulation results indicate that hysteresis current control is working perfectly to respond the fluctuation of speed and able to increase power factor compared to average current control method.