Computationally efficient approaches for evaluation of rotor eddy current loss in permanent magnet brushless machines

The paper describes a number of computationally efficient techniques for predicting rotor eddy current loss in permanent-magnet brushless machines. In particular, a correction factor which takes into account the finite length effect of magnets is employed to adjust analytically predicted losses for...

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Bibliographic Details
Published in2009 International Conference on Electrical Machines and Systems pp. 1 - 6
Main Authors Wang, J., Papini, F., Chin, R., Arshad, W.M., Lendenmann, H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2009
Subjects
Boundary conditions
Brushless machines
eddy current loss
Eddy currents
finite element analysis
Finite element methods
Harmonic analysis
Magnetic analysis
Magnetic losses
Permanent magnet machines
Permanent magnets
Stators
Thin wall structures
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Summary:The paper describes a number of computationally efficient techniques for predicting rotor eddy current loss in permanent-magnet brushless machines. In particular, a correction factor which takes into account the finite length effect of magnets is employed to adjust analytically predicted losses for each harmonic. The results are compared with 3-dimensional (3D) finite element (FE) calculations. A simplified 3D FE model, in which the stator magneto-motive force (MMF) is distributed as current sheets in the slots of a highly permeable, thin-walled cylinder, is employed to quantify the 3D eddy current distribution in magnets and their associated losses. Appropriate boundary conditions are set to reduce model complexity and size, and hence computation time. The utility and accuracy of these approaches are discussed and compared, and their relative merits are assessed.
ISBN:9781424451777
1424451779
DOI:10.1109/ICEMS.2009.5382991