A novel indirect rotor position sensing method to improve the performance of sensorless drive for brushless DC motors

브러시리스 직류 전동기 센서리스 드라이브의 성능 향상을 위한 새로운 회전자 위치 간접 검출 방식

In this paper, a novel indirect rotor position sensing method is proposed to improve the performance of sensorless drive of brushless DC motors. Fast mode change to the sensorless operation is difficult in the existing indirect rotor position sensing methods because precise rotor position can not be obtained when an excessive input is applied to the drive during synchronous operation mode. To cope with this problem, the relationship between terminal voltage and back-emf waveform is analyzed in this paper, also a novel indirect position sensing method which can detect a precise rotor position at low speed range is proposed. The effectiveness of the proposed method is verified through the experimental results.