Analysis of Eddy current losses of segmented Nd-Fe-B sintered magnets considering contact resistance

Norio Takahashi; Hirofumi Shinagawa; Daisuke Miyagi; Yuhito Doi; Koji Miyata

doi:10.1109/TMAG.2009.2012576

Analysis of Eddy current losses of segmented Nd-Fe-B sintered magnets considering contact resistance

Norio Takahashi, Hirofumi Shinagawa, Daisuke Miyagi, Yuhito Doi, Koji Miyata

ENG - Electrical Engineering

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

In large permanent magnet motors, the permanent magnet in the motor is segmented into parts in order to reduce the eddy current loss. It is reported that the insulation between NdFeB sintered magnets is possible only by contacting the segmented permanent magnets without the insulation. But the mechanism for such a phenomenon has not been clear yet. In this paper, the effect of force on the apparent contact resistance between permanent magnets is examined. The idea of contact resistance coefficient is also discussed. It is shown that the eddy current loss of segmented sintered NdFeB magnets is almost the same as the loss of the case when an insulating material is inserted between magnets.

Original language	English
Article number	4787403
Pages (from-to)	1234-1237
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	45
Issue number	3
DOIs	https://doi.org/10.1109/TMAG.2009.2012576
Publication status	Published - 2009 Mar 1

Keywords

AC magnetic loss
Contact resistance
Eddy current
Segmented magnet

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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abstract = "In large permanent magnet motors, the permanent magnet in the motor is segmented into parts in order to reduce the eddy current loss. It is reported that the insulation between NdFeB sintered magnets is possible only by contacting the segmented permanent magnets without the insulation. But the mechanism for such a phenomenon has not been clear yet. In this paper, the effect of force on the apparent contact resistance between permanent magnets is examined. The idea of contact resistance coefficient is also discussed. It is shown that the eddy current loss of segmented sintered NdFeB magnets is almost the same as the loss of the case when an insulating material is inserted between magnets.",

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AU - Takahashi, Norio

AU - Shinagawa, Hirofumi

AU - Miyagi, Daisuke

AU - Doi, Yuhito

AU - Miyata, Koji

PY - 2009/3/1

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N2 - In large permanent magnet motors, the permanent magnet in the motor is segmented into parts in order to reduce the eddy current loss. It is reported that the insulation between NdFeB sintered magnets is possible only by contacting the segmented permanent magnets without the insulation. But the mechanism for such a phenomenon has not been clear yet. In this paper, the effect of force on the apparent contact resistance between permanent magnets is examined. The idea of contact resistance coefficient is also discussed. It is shown that the eddy current loss of segmented sintered NdFeB magnets is almost the same as the loss of the case when an insulating material is inserted between magnets.

AB - In large permanent magnet motors, the permanent magnet in the motor is segmented into parts in order to reduce the eddy current loss. It is reported that the insulation between NdFeB sintered magnets is possible only by contacting the segmented permanent magnets without the insulation. But the mechanism for such a phenomenon has not been clear yet. In this paper, the effect of force on the apparent contact resistance between permanent magnets is examined. The idea of contact resistance coefficient is also discussed. It is shown that the eddy current loss of segmented sintered NdFeB magnets is almost the same as the loss of the case when an insulating material is inserted between magnets.

KW - AC magnetic loss

KW - Contact resistance

KW - Eddy current

KW - Segmented magnet

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