Rotor Eddy-Current Loss in Permanent-Magnet Brushless AC Machines

Author

Wang, Jiabin ; Atallah, K. ; Chin, R. ; Arshad, W.M. ; Lendenmann, H.

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. of Sheffield, Sheffield, UK

Volume

46

Issue

7

fYear

2010

fDate

7/1/2010 12:00:00 AM

Firstpage

2701

Lastpage

2707

Abstract

This paper analyzes rotor eddy-current loss in permanent-magnet brushless ac machines. It is shown that analytical or finite-element techniques published in literature for predicting rotor eddy-current loss using space harmonic based approaches may not yield correct results in each magnet segment when one magnet-pole is circumferentially segmented into more than two pieces. It is also shown that the eddy-current loss in each equally segmented piece may differ by a large margin, which implies that the temperature distribution in the magnets will be uneven and the risk of demagnetization has to be carefully assessed. The theoretical derivation is validated by time-stepped transient finite-element analysis.

Keywords

AC machines; brushless machines; eddy current losses; finite element analysis; permanent magnet machines; rotors; temperature distribution; magnet-pole; permanent-magnet brushless AC machines; rotor eddy-current loss; space harmonic; temperature distribution; time-stepped transient finite-element analysis; Eddy-current loss; permanent-magnet brushless machines;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2010.2042963

Filename

5427141