Invention Grant
- Patent Title: Rotating machine with sintered magnet and method for producing sintered magnet
- Patent Title (中): 带烧结磁体的旋转机及烧结磁体制造方法
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Application No.: US13453634Application Date: 2012-04-23
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Publication No.: US08350430B2Publication Date: 2013-01-08
- Inventor: Matahiro Komuro , Yuichi Satsu , Yoshii Morishita , Shigeaki Funyu , Mitsuo Katayose
- Applicant: Matahiro Komuro , Yuichi Satsu , Yoshii Morishita , Shigeaki Funyu , Mitsuo Katayose
- Applicant Address: JP Tokyo
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Crowell & Moring LLP
- Priority: JP2008-195950 20080730
- Main IPC: H02K1/02
- IPC: H02K1/02 ; H02K1/27 ; H02K21/12

Abstract:
An R—Fe—B sintered magnet has a structure including main phase crystal grains and a grain boundary area surrounding the crystal grains. The sintered magnet includes fluorine and a specified metal element selected from elements belonging to Group 2 through Group 16 of periodic table excepting the rare earth element, carbon and boron. The fluorine has a higher concentration in a region closer to a magnet surface than in the center. The specified element also has a higher concentration in the region closer to the surface. The sintered magnet includes oxyfluoride containing carbon, Dy and the metal element in a grain boundary area region at a distance of 1 μm or greater from the magnet surface, and the carbon has a higher concentration than the concentration of the metal element in a region at a distance of 1 μm to 500 μm from the magnet surface.
Public/Granted literature
- US20120205573A1 Rotating Machine with Sintered Magnet and Method for Producing Sintered Magnet Public/Granted day:2012-08-16
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