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http://dx.doi.org/10.7467/KSAE.2014.22.1.095

A Study of the ZCP Estimation Methods considering Discretization Error and High Speed BLDC Sensorless Drive  

Seo, Eunjeong (Department of Control & Instrumentation Engineering, Graduate School, Changwon National University)
Sohn, Jeongwon (Department of Automotive Engineering, Graduate School, Hanyang University)
Sunwoo, Myoungho (Department of Automotive Engineering, Hanyang University)
Lee, Wootaik (Department of Control & Instrumentation Engineering, Changwon National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.22, no.1, 2014 , pp. 95-102 More about this Journal
Abstract
This paper presents zero crossing point(ZCP) estimation methods considering discretization error for a high speed brushless DC(BLDC) motor drive. The ZCP is estimated by detecting the change of back-EMF polarity for the BLDC sensorless drive, and the discretization error exist on the estimated ZCP. The discretization error of the ZCP is a cause of the delay of a commutation timing of current and increment of a current ripple factor. Besides a delay of a ZCP estimation brings on the limitation of a speed range for the BLDC sensorless drive. The compensation method based on the error analysis with probability theory for reducing the effects of the discretization error of the ZCP is proposed. Also a ZCP estimation method according to the Back-EMF patterns is proposed to widen the speed range for the BLDC sensorless drive. The proposed methods are verified by the experiment.
Keywords
Brushless DC motor(BLDC); Sensorless drive; Zero crossing point detection(ZCP); Discretization error;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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