Title:
焼結磁石及びそれを用いた回転機
Document Type and Number:
Japanese Patent JP4672030
Kind Code:
B2
Abstract:
The sintered magnet 200; 103, 106 and the rotating machine equipped with the same are disclosed. The sintered magnet 200; 103, 106 includes crystal grains of a ferromagnetic material consisting mainly of iron, and a fluoride compound or oxyfluoride compound layer containing at least one element selected from an alkali metal element, an alkali earth metal element, and a rare earth element. The layer is formed inside some of the crystal grains or in a part of a grain boundary part. An oxyfluoride compound or fluoride compound layer containing carbon in a stratified form is formed on an outermost surface of the crystal grains. The fluoride compound or oxyfluoride compound layer has a concentration gradient of carbon, contains at least one light rare earth element and at least one heavy rare earth element. The heavy rare earth element has a concentration lower than that of the light rare earth element.
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Inventors:
Komuro Matahiro
Yuichi Satsu
Yutaka Matsunobu
Takashi Yasuhara
Yuichi Satsu
Yutaka Matsunobu
Takashi Yasuhara
Application Number:
JP2008020040A
Publication Date:
April 20, 2011
Filing Date:
January 31, 2008
Export Citation:
Assignee:
Hitachi Automotive Systems, Ltd.
International Classes:
H02K15/03; H01F1/08; H02K1/27
Domestic Patent References:
| JP2007194599A |
Attorney, Agent or Firm:
Manabu Inoue