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Journal of Control Science and Engineering
Volume 2018, Article ID 3530127, 9 pages
Research Article

Harmonic Analysis on Torque Ripple of Brushless DC Motor Based on Advanced Commutation Control

1School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
2State Grid Zibo Power Supply Company, Zibo 255000, China

Correspondence should be addressed to Bin Li; nc.ude.ujt@bile

Received 29 September 2017; Revised 7 December 2017; Accepted 26 December 2017; Published 1 February 2018

Academic Editor: Carlos-Andrés García

Copyright © 2018 Yanpeng Ji et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper investigates the relationship between current, back electromotive force (back-EMF), and torque for permanent-magnet brushless DC (PM BLDC) motors under advanced commutation control from the perspective of harmonics. Considering that the phase current is the influencing factor of both torque and torque ripple, this paper firstly analyzes the effects of advanced commutation on phase current and current harmonics. And then, based on the harmonics of the phase current and back-EMF, the torque harmonic expressions are deduced. The expressions reveal the relationship of harmonic order between the torque, phase current, and back-EMF and highlight the different contribution of individual torque harmonic to the total torque ripple. Finally, the proposed harmonic analysis method is verified by the experiments with different speed and load conditions.