브러시리스 직류전동기용 센서리스 드라이브의 토크 맥동 저감 방법

Torque Ripple Reduction Method in a Sensorless Drive for BLDC Motor

This paper presents a method to reduce commutation torque ripple in a sensorless brushless DC motor drive without current sensors. To compensate the commutation torque ripple completely, the duration of commutation must be known. The proposed method measures the duration of commutation from terminal voltage waveforms, calculates a PWM duty ratio to suppress the commutation torque ripple from the output of speed controller, and applies the calculated PWM duty ratio only during the commutation. Experimental results show that vibrations are considerably reduced when the proposed method is applied to the sensorless brushless DC moter drive for air-conditioner compressor.