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Eddy current losses of segmented Nd‐Fe‐B sintered magnets without insulation under various conditions

Norio Takahashi (Electrical and Electronic Engineering Department, Okayama University, Okayama, Japan)
Hirofumi Shinagawa (Electrical and Electronic Engineering Department, Okayama University, Okayama, Japan)
Daisuke Miyagi (Electrical Engineering Department, Tohoku University, Sendai, Japan)
Yuhito Doi (Magnetic Materials R&D Center, Shin‐Etsu Chemical Co., Echizen, Japan)

Abstract

Purpose

The purpose of this paper is to examine the mechanism of the increase or decrease of eddy current loss of the segmented Nd‐Fe‐B sintered magnets without insulation, and the effects of parameters on such a phenomenon are discussed.

Design/methodology/approach

The measured contact resistance is used in the finite element analysis.

Findings

It is shown that the eddy current loss in a magnet shows the peak value when the number of segments are increased at 40 kHz, but this property is changed at low frequency (10 kHz). Its tendency is changed by the contact resistance and the permeance (surrounding iron core).

Originality/value

The reason of a curious property of eddy current loss of segmented magnets is clearly explained by examining the eddy current distribution at various contact resistances.

Keywords

Citation

Takahashi, N., Shinagawa, H., Miyagi, D. and Doi, Y. (2011), "Eddy current losses of segmented Nd‐Fe‐B sintered magnets without insulation under various conditions", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 30 No. 6, pp. 1679-1687. https://doi.org/10.1108/03321641111168011

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited