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http://dx.doi.org/10.5370/KIEE.2014.63.1.035

A Design of Programmable Low Pass Filter to Reduce the ZCP Estimation Error at High Speed BLDC Sensorless Drive  

Seo, Eunjeong (Department of Control & Instrumentation Engineering, Graduate School, Changwon National Univ.)
Lee, Kangseok (Department of Control & Instrumentation Engineering, Graduate School, Changwon National Univ.)
Lee, Wootaik (Dept. of Control & Instrumentation Engineering, Changwon National Univ.)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.63, no.1, 2014 , pp. 35-41 More about this Journal
Abstract
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.
Keywords
Brushless DC motor; Sensorless; Zero crossing point; Programmable low pass filter; Measurement nois of terminal voltage; Estimation error;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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