Curvature-related eddy-current losses in laminated axial flux machine cores

Ahfock, Tony L. and Hewitt, Andrew (2005) Curvature-related eddy-current losses in laminated axial flux machine cores. IET Electric Power Applications, 152 (5). pp. 1350-1358. ISSN 1350-2352


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In this paper we present an axiperiodic quasi-static model to evaluate
the magnetic flux density distribution and power loss due to curvature related radial
flux in the laminated core of axial flux machines. It is shown that the relatively low
effective permeability in the radial direction and the shielding effect of induced eddy
currents result in negligible radial flux density compared to the peak flux densities in
the axial and circumferential directions. This justifies the assumption of zero radial
flux which simplifies electromagnetic modelling of axial flux machine cores. The
model predicts that power loss due to curvature related radial flux is insignificant
compared to normal eddy current loss if the core permeability, core conductivity and
number of poles are sufficiently high. A laboratory technique is proposed for the
practical detection of power loss due to curvature related radial flux.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Publisher: Institution of Electrical Engineers (IEE)
Item Status: Live Archive
Additional Information (displayed to public): Reproduced in accordance with the copyright policy of the publisher.
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Electrical, Electronic and Computer Engineering
Date Deposited: 11 Oct 2007 00:25
Last Modified: 02 Jul 2013 22:33
Uncontrolled Keywords: axial flux machines, magnetic flux density distribution, axiperiodic electromagnetic model, eddy currents
Fields of Research (FoR): 09 Engineering > 0906 Electrical and Electronic Engineering > 090699 Electrical and Electronic Engineering not elsewhere classified
Identification Number or DOI: doi: 10.1049/ip-erp:20045280

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