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

Norio Takahashi, Hirofumi Shinagawa, Daisuke Miyagi, Yuhito Doi

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1679-1687
Number of pages9
JournalCOMPEL - The international journal for computation and mathematics in electrical and electronic engineering
Volume30
Issue number6
DOIs
Publication statusPublished - 2011 Nov 15

Keywords

  • Eddy current loss
  • Finite element methods
  • Insulation
  • Magnetism
  • Nd-Fe-B magnet

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Theory and Mathematics
  • Electrical and Electronic Engineering
  • Applied Mathematics

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