Magnet Eddy-Current Loss Analysis of Interior PM Machines for Electric Vehicle Application

The magnet eddy-current losses of six interior permanent magnet (IPM) machines are investigated for electric vehicle applications in this paper. The armature field, eddy-current density of magnet, the influence of PM depth, the distance of PM layers, and the number of PM segmentation are studied by...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2017-11, Vol.53 (11), p.1-4
Main Authors: Hu, Yaohua, Zhu, Shushu, Liu, Chuang
Format: Article
Language:English
Subjects:
Armature-reaction flux
Computational modeling
Current loss
Eddy current testing
Eddy currents
eddy-current density
Electric vehicles
Finite element method
interior permanent magnet (IPM) machines
Iron
Loss measurement
magnet eddy-current loss
Magnetic analysis
Magnetic flux
Magnetic losses
Magnetism
permanent magnet (PM) segmentation
Rotors
Segmentation
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Summary:The magnet eddy-current losses of six interior permanent magnet (IPM) machines are investigated for electric vehicle applications in this paper. The armature field, eddy-current density of magnet, the influence of PM depth, the distance of PM layers, and the number of PM segmentation are studied by finite-element analysis. It is demonstrated that increasing the PM depth of first layer and the distance of PM layers can provide more soft iron space for the armature-reaction flux, which can reduce the magnet eddy-current loss. PM segmentation can effectively reduce the PM eddy-current loss, because the eddy-current paths are divided into smaller loops, increasing the effective resistance. An IPM machine with segmented PM is prototyped to verify the analysis.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2700850