Commutation Error Compensation Strategy for Sensorless Brushless DC Motors

Xuliang Yao, Jicheng Zhao, Guangxu Lu, Hao Lin and Jingfang Wang
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Xuliang Yao: College of Automation, Harbin Engineering University, Harbin 150001, China
Jicheng Zhao: College of Automation, Harbin Engineering University, Harbin 150001, China
Guangxu Lu: College of Automation, Harbin Engineering University, Harbin 150001, China
Hao Lin: College of Automation, Harbin Engineering University, Harbin 150001, China
Jingfang Wang: College of Automation, Harbin Engineering University, Harbin 150001, China

Energies, 2019, vol. 12, issue 2, 1-22

Abstract: Sensorless brushless DC (BLDC) motor drive systems often suffer from inaccurate commutation signals, which result in current fluctuation and high conduction loss. To improve precision of commutation signals, this paper presents a novel commutation error compensation strategy for BLDC motors. First, the relationship between the line voltage difference integral in 60 electrical degree conduction interval and the commutation error is analyzed. Then, in terms of the relationship derived, a feedback compensation strategy based on the line voltage difference integral is proposed to regulate commutation signals by making three-phase back electromotive force (EMF) integral to zero, and the effect of the freewheeling process on the line voltage difference integral is considered. Moreover, an incremental PI controller is designed to achieve closed-loop compensation for the commutation error automatically. Finally, experiment results verify feasibility and effectiveness of the proposed strategy.

Keywords: brushless DC (BLDC) motor; sensorless motor; commutation error compensation; free-wheeling period (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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