A Study on the Universal Motor Speed Controller for Eliminating Harmonic Current

고조파전류 감쇠용 유니서셜모터 속도제어기에 관한 연구

Phase angle control ac drives system gains a high popularity due to their simple implementation despite the disadvantage of their poor input power factor especially for large values of phase delay angle. Furthermore it generates subharmononic current at specific phase angle. As input current of do drive systems are sinusoidal, the power factor and subharmonic current characteristics are improve. This paper presents the application of a PWM control technique of do chopper system to reduce the subharmonic current and its characteristics using single-phase dc chopper drive system of universal motor.