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.

公开(公告)号：US20130187311A1

公开(公告)日：2013-07-25

申请号：US13727449

申请日：2012-12-26

Applicant: Nichia Corporation

Inventor： Shinji YOSHIMA ,  Muneo YAMAMOTO ,  Shuichi TADA ,  Akihiro IMAYAMA

IPC: B29C47/00

CPC classification number: B29C47/0004 ,  B29C47/0023 ,  B29C47/0066 ,  B29C47/20 ,  B29C47/92 ,  B29C2947/92704 ,  B29K2995/0008 ,  H01F41/028

Abstract: In a method for manufacturing a cylindrical bonded magnet, a molding space having a cylindrical shape is filled with a bonded magnet composition containing a magnetic material and a resin. The magnetic material disposed in the molding space is magnetically oriented using an orientation magnet. The orientation magnet includes a first permanent magnet and a second permanent magnet. The first and second permanent magnets are disposed such that same poles are opposite each other in the axial direction.

Abstract translation: 在制造圆柱形粘结磁体的方法中，用含有磁性材料和树脂的粘结磁体组合物填充具有圆柱形形状的模制空间。 设置在成型空间中的磁性材料使用定向磁铁进行磁取向。 取向磁铁包括第一永久磁铁和第二永久磁铁。 第一永久磁铁和第二永久磁铁被设置为使得相同的磁极在轴向方向上彼此相对。