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A Method for Predicting Flux Loss of Multipole Magnet and Its Evaluation

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Title: A Method for Predicting Flux Loss of Multipole Magnet and Its Evaluation
Authors: Fukunaga, Hirotoshi / Narikiyo, Shohei / Koreeda, Hiroyuki / Yanai, Takeshi / Nakano, Masaki / Yamashita, Fumitoshi
Issue Date: Oct-2011
Publisher: Institute of Electrical and Electronics Engineers
Citation: IEEE Transactions on Magnetics, 47(10), pp.4108-4111; 2011
Abstract: The prediction of flux loss due to exposure at an elevated temperature is very important in applications of Nd-Fe-B magnets because of the low Curie temperature of the Nd2 Fe14 B. Previously, we proposed the prediction method of the initial flux loss, FLint, from basic magnetic properties of a magnet by taking advantage of the finite element method. The prediction method takes the magnetizing process and the distribution of coercivity into account, and is composed of four steps, 1) simulation of distribution of magnetization under magnetizing filed, 2) determination of demagnetization curves at room and exposure temperatures, 3) simulation of distributions of magnetization at room and exposure temperatures, and finally 4) prediction of distribution of FLint. We applied this method to a Nd-Fe-B ring magnet with 12 poles, and predicted FLint due to the exposure at 120°C. Subsequently, the prediction method was evaluated by comparing the predicted FLint values with the experimental ones. The predicted FLint values agreed with those obtained experimentally, which suggests the validity of the proposed method.
Keywords: Coercivity / flux loss / magnetization process / Nd-Fe-B magnet / permanent magnet motor
URI: http://hdl.handle.net/10069/26164
ISSN: 00189464
DOI: 10.1109/TMAG.2011.2158195
Rights: © 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/26164

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