公开(公告)号：US20180130581A1

公开(公告)日：2018-05-10

申请号：US15559652

申请日：2016-03-24

Applicant: NITTO DENKO CORPORATION

Inventor： Kenichi FUJIKAWA ,  Katsuya KUME ,  Kazuo OUCHI ,  Toshinobu HOSHINO ,  Masakazu MORIMOTO ,  Hirofumi ONO ,  Katsuyuki NAKABAYASHI ,  Miho YAMAGUCHI ,  Hiroshi MATSUO ,  Toshiaki OKUNO ,  Makoto FUJIHARA ,  Eiichi IMOTO ,  Hirofumi EBE ,  Tomohiro OMURE ,  Izumi OZEKI ,  Takashi YAMAMOTO ,  Yuki KATO ,  Tomoya MATSUDA ,  Shoichiro SAITO

IPC: H01F1/08 ,  H01F41/02 ,  H01F1/057 ,  H02K1/27 ,  H01F7/02

CPC classification number: H01F1/086 ,  H01F1/057 ,  H01F1/0577 ,  H01F7/02 ,  H01F41/0273 ,  H01F41/028 ,  H01F41/0293 ,  H02K1/27

Abstract: Provided is a method for producing a sintered body that forms a rare-earth permanent magnet, has a single sintered structure and an arbitrary shape, and has easy magnetization axis orientations of different directions applied to the magnet material particles in a plurality of arbitrary regions. This method forms a three-dimensional first molded article from a composite material formed by mixing a resin material and magnet material particles containing a rare-earth substance. The first molded article is then subjected to a deforming force and a second molded article is formed in which the orientation direction of the easy magnetization axis of the magnet material particles in at least the one section of the horizontal cross-section is changed to a direction which differs from the orientation direction of the first molded article. The second molded article is heated to a sintering temperature and kept at the temperature for a period of time.

公开(公告)号：US20200161032A1

公开(公告)日：2020-05-21

申请号：US16611618

申请日：2018-05-08

Applicant: NITTO DENKO CORPORATION

Inventor： Kenichi FUJIKAWA ,  Takashi YAMAMOTO ,  Shoichiro SAITO ,  Takashi OZAKI ,  Katsuya KUME

IPC: H01F1/057 ,  H01F13/00 ,  H01F41/02 ,  H01F7/02 ,  H01F1/053

Abstract: The rare-earth sintered magnet has a configuration in which a large number of magnet material particles including a rare-earth substance and each having an axis of easy magnetization have been integrally sintered. The rare-earth sintered magnet is provided with a first surface and a second surface opposing each other in the thickness direction. In a plane in parallel with a width direction and the thickness direction, the magnet material particles are magnetized such that, in a region extending from each of both end portions in the width direction toward the center portion in the width direction, the orientation direction of the easy magnetization axis is gradually changed. A maximum surface magnetic flux density in the first surface and a maximum surface magnetic flux density in the second surface satisfy the relationship (D1/D2)≥4.

公开(公告)号：US20190262902A1

公开(公告)日：2019-08-29

申请号：US16342620

申请日：2017-10-17

Applicant: NITTO DENKO CORPORATION ,  TOYO TANSO CO., LTD.

Inventor： Takashi YAMAMOTO ,  Katsuya KUME ,  Toshiaki OKUNO ,  Hirofumi EBE ,  Takaaki KAKIKUBO ,  Hiroto MAKI ,  Tomoo TOKUNO ,  Ichiro FUJITA

IPC: B22F3/14 ,  B28B3/02 ,  B28B7/26

Abstract: A stacking die comprises a stacked multiple stacking plates and a side plate(s) which fixes the multiple stacking plates in a stacked state, wherein at least one or more processing object(s) is retained in a space(s) formed between the multiple stacking plates. Further, surfaces where the stacking plates and the side plate(s) abut each other are preferably tapered so that they form tapered shapes in a direction opposite to the approach direction of the side plate(s).

公开(公告)号：US20170178806A1

公开(公告)日：2017-06-22

申请号：US15118140

申请日：2014-02-12

Applicant: NITTO DENKO CORPORATION

Inventor： Keisuke TAIHAKU ,  Katsuya KUME ,  Toshiaki OKUNO ,  Izumi OZEKI ,  Tomohiro OMURE ,  Takashi OZAKI ,  Takashi YAMAMOTO

IPC: H01F41/02 ,  H02K1/27 ,  B22F3/10 ,  C22C38/00 ,  B22F9/04 ,  B22F3/16 ,  H02K15/03 ,  H01F7/02

CPC classification number: H01F41/0266 ,  B22F3/1017 ,  B22F3/1021 ,  B22F3/16 ,  B22F3/22 ,  B22F5/006 ,  B22F5/106 ,  B22F7/062 ,  B22F9/04 ,  B22F2009/041 ,  B22F2202/05 ,  B22F2301/355 ,  B22F2302/45 ,  B22F2303/40 ,  B22F2998/10 ,  B22F2999/00 ,  C22C33/0278 ,  C22C38/002 ,  C22C38/005 ,  C22C2202/02 ,  H01F1/0577 ,  H01F7/02 ,  H01F41/0273 ,  H02K1/27 ,  H02K15/03 ,  B22F2009/043 ,  B22F2009/044 ,  B22F2201/02 ,  B22F2201/11 ,  B22F2201/12 ,  B22F9/023 ,  B22F1/0074 ,  B22F3/105 ,  B22F2201/01

Abstract: Provided are: a permanent magnet wherein the magnetic field orientation process can be made simple and a degree of orientation thereof can be improved; a method for manufacturing a permanent magnet, an SPM motor using a permanent magnet, and a method for manufacturing an SPM motor. Raw material magnet is milled to magnet powder, and the magnet powder is mixed with a binder to form a compound. Then, the compound is molded by hot-melt molding to a green sheet in a shape of a sheet onto a supporting substrate. Thereafter, a magnetic field is applied to the green sheet thus molded to carry out magnetic field orientation. Further, with fixing plural green sheets after the magnetic field orientation by lamination under a deformed state thereof, the plural green sheets thus laminated are cut for shaping to a prescribed shape, which is followed by sintering to produce a permanent magnet.