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Energies 2016, 9(11), 904; doi:10.3390/en9110904

A Novel Flux Focusing Magnetically Geared Machine with Reduced Eddy Current Loss

1,2
,
1,2,* , 1,2
,
1,2
and
1,2
1
School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
2
Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle, Zhenjiang 212013, China
*
Author to whom correspondence should be addressed.
Academic Editor: K.T. Chau
Received: 18 July 2016 / Revised: 26 October 2016 / Accepted: 27 October 2016 / Published: 2 November 2016
(This article belongs to the Special Issue Electric Machines and Drives for Renewable Energy Harvesting)

Abstract

This paper proposes a novel flux focusing magnetically geared (MG) machine for wind power generation, considering the permanent magnets (PMs) eddy current loss and the balance between the pull-out torque of MG machine and the back-electromotive force (EMF)of the PM brushless machine. The PM eddy current loss in the two rotors of the conventional surface-mounted MG machine is calculated and analyzed by using finite-element method. By adopting serial-spoke structure in the inner rotor, a novel rotor structure for a MG machine is proposed to reduce the PM eddy current loss. Moreover, in order to balance the pull-out torque and the back-EMF, several serial-spoke structures and the main design parameters are investigated. Then, a quantitative comparison between the proposed topology and the conventional surface-mounted MG machine is performed. The analysis results indicate that the PM eddy current loss of the proposed MG machine can be significantly reduced and its pull-out torque and back-EMF can be balanced well. View Full-Text
Keywords: finite-element method; eddy current loss; magnetic gear; serial-spoke structure; torque; back-electromotive force finite-element method; eddy current loss; magnetic gear; serial-spoke structure; torque; back-electromotive force
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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. (CC BY 4.0).

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MDPI and ACS Style

Liu, J.; Zhao, W.; Ji, J.; Liu, G.; Tao, T. A Novel Flux Focusing Magnetically Geared Machine with Reduced Eddy Current Loss. Energies 2016, 9, 904.

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