No abstract

이산화 오차를 고려한 ZCP 추정방법과 고속 BLDC 센서리스 구동에 관한 연구 서 은 정 1) ․손 정 원 2) ․선 우 명 호 3) ․이 우 택 *4) 창원대학교 대학원 제어계측공학과 1) ․한양대학교 대학원 자동차공학과 2) ․ 한양대학교 미래자동차공학과 3) ․창원대학교 제어계측공학과 4)

-This paper presents a design method of programmable low pass filter(PLPF) which reduce an estimation error of a zero crossing point(ZCP) for a high speed brushless DC(BLDC) motor drive. BLDC motor sensorless drive is possible by estimation of ZCP. The ZCP estimated by detecting a change of back-EMF polarity has the estimation error because noises exist on the measured back-EMF. Therefore a calculated commutation timing using the ZCP is inaccurate. And the inexact commutation timing leads to ripples of 3-phase current and degradation of drive performance. This paper proposes the design method of the PLPF to overcome these problems. First, a speed calculated a inaccurate period of the ZCP is analyzed in the frequency domain. Then, the PLPF that has varying cut-off frequency according to change of the speed is designed on the frequency analysis result. The proposed method is verified by the experiment.