The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2012
Filed:
Aug. 10, 2010
Fumitoshi Yamashita, Kitasaku-gun, JP;
Osamu Yamada, Kitasaku-gun, JP;
Shiho Ohya, Kitasaku-gun, JP;
Fumitoshi Yamashita, Kitasaku-gun, JP;
Osamu Yamada, Kitasaku-gun, JP;
Shiho Ohya, Kitasaku-gun, JP;
Minebea Co., Ltd., Nagano, JP;
Abstract
Anisotropic rare earth-iron based resin bonded magnet comprises: [1] a continuous phase including: (1) a spherical SmFeNbased magnetic material covered with epoxy oligomer where its average particle size is 1 to 10 μm, its average aspect ratio ARis 0.8 or more, and mechanical milling is not applied after Sm—Fe alloy is nitrided; (2) a linear polymer with active hydrogen group reacting to the oligomer; and (3) additive; and [2] a discontinuous phase being an NdFeB based magnetic material coated with the epoxy oligomer where its average particle size is 50 to 150 μm, and its average aspect ratio ARis 0.65 or more, further satisfying: [3] the air-gap ratio of a granular compound on the phases is 5% or less; and [4] a composition where crosslinking agent with 10 μm or less is adhered on the granular compound is formed at 50 MPa or less.