The flux condition of the magnetic circuit with a permanent magnet taking into account the long-time stability

• Itoh Kaoru

  Toshiba Corporation

• Hashiba Yutaka

  Toshiba Corporation

• Sakai Kazuto

  Toshiba Corporation

• Yagisawa Takeshi

  Toshiba Corporation

Bibliographic Information

Other Title

• 長期安定性を考慮した永久磁石磁気回路の磁束条件
• チョウキ アンテイセイ オ コウリョシタ エイキュウ ジシャク ジキ カイロ

Abstract

In the magnetic circuits under the demagnetizing field condition the fluxes of permanent magnets decrease gradually with the operating time. The loss of the flux is irreversible and affected by the magnetic properties, the temperature and the dimensional condition of the magnetic circuit. This paper proposes a new method for estimating the flux loss of rare-earth magnets for the application required the long-time stability. The non-dimensional value Δ=μr•HCJ/B_r-(1-B/B_r), the 1st term is decided by the magnetic properties at the operating temperature and the 2nd term is decided by the condition of the magnetic circuit, can be used as the parameter to predict the flux stability. When Δ is greater than 0.2, both of the initial flux loss and the aging loss of the rareearth magnets are shown in a small amount.

Journal

• IEEJ Transactions on Fundamentals and Materials

  IEEJ Transactions on Fundamentals and Materials 118 (2), 176-181, 1998

  The Institute of Electrical Engineers of Japan

Keywords

• 磁気回路
• 評価手法
• 永久磁石
• 磁気特性
• 減磁
• 安定性

Details

• CRID: 1390001204598359040
• NII Article ID: 130006838301
• NII Article ID: 10002823647
• NII Book ID: AN10136312
• DOI: 10.1541/ieejfms1990.118.2_176
• ISSN: 13475533
• ISSN: 03854205
• NDL BIB ID: 4391697
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4391697
• Web Site: https://www.jstage.jst.go.jp/article/ieejfms1990/118/2/118_2_176/_pdf
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed