公开(公告)号：US20250010369A1

公开(公告)日：2025-01-09

申请号：US18764657

申请日：2024-07-05

Applicant: NICHIA CORPORATION

Inventor： Rie YOSHIDA ,  Daichi ITAMI ,  Muneo YAMAMOTO

IPC: B22F3/22 ,  H01F1/057 ,  H01F7/02 ,  H01F41/02

Abstract: A method of producing a cylindrical bonded magnet includes providing a mold including an inner mold portion, an outer mold portion, a first orientation magnet, and a second orientation magnet, and performing molding to obtain a cylindrical bonded magnet by filling a region between the outer surface of the inner mold portion and the inner surface of the outer mold portion with a resin composition. When viewed in a cross-section, a first distance is shorter than a second distance, the first distance is a straight line distance along a magnetic field application direction and is tangent to a circle defined by the inner surface of the outer mold portion, and the second distance is a straight line distance along the magnetic field application direction and passes through a center of a circle defined by the outer surface of the inner mold portion.

公开(公告)号：US20240047112A1

公开(公告)日：2024-02-08

申请号：US18366601

申请日：2023-08-07

Applicant: NICHIA CORPORATION

Inventor： Rie YOSHIDA ,  Daichi ITAMI ,  Masahiro ABE ,  Kuniyasu KAWAMURA ,  Takayuki YANO ,  Muneo YAMAMOTO

IPC: H01F7/02 ,  H01F1/059

CPC classification number: H01F7/021 ,  H01F1/059

Abstract: A cylindrical multipole magnet having an inner peripheral surface and an outer peripheral surface and having N- and S-poles alternately and continuously in a circumferential direction. A surface magnetic flux density of the outer peripheral surface is at least 0.2 times a surface magnetic flux density of the inner peripheral surface. The cylindrical multipole magnet contains an anisotropic rare earth magnetic powder and a resin, with a filling ratio of the anisotropic rare earth magnetic powder being at least 50 vol % but not higher than 65 vol % with respect to a total volume of the anisotropic rare earth magnetic powder and the resin.