3D optimal design of open type magnetic circuit producing uniform field

N. Takahashi, S. Nakazaki, H. Kato, J. Asaumi

Research output: Contribution to journalArticle

Abstract

Purpose The purpose of this paper is to provide an approach to the optimal design of open type magnetic circuit of permanent magnet having uniform field. Design/methodology/approach The Biot-Savarts law and evolution strategy are used for the design of permanent magnet configuration. The optimization is carried out by changing the objective function, dimension of target region, and target flux density. Findings The obtained uniformity is affected by the selection of objective function, dimension of target region, and target flux density. About 50 ppm uniformity of 0.08T in the imaging area is obtained by changing the dimensions, dimension of target region, and target flux of 3D magnets and the amplitudes of magnetization and the directions of magnetization vectors. Originality/value This paper describes a new approach for obtaining the optimal shape of open type magnetic circuit which may be used when magnetic resonance imaging is carried out.

Original languageEnglish
Pages (from-to)1236-1248
Number of pages13
JournalCOMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering
Volume28
Issue number5
DOIs
Publication statusPublished - Sep 11 2009

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Keywords

  • Circuits
  • Magnetic devices
  • Optimum design

ASJC Scopus subject areas

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

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