Title:
RARE EARTH SINTERED MAGNET AND SINTERED BODY FOR RARE EARTH SINTERED MAGNET WHICH IS USED FOR THE SAME, AND MAGNETIC FIELD APPLYING DEVICE THAT CAN BE USED FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2018190982
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a rare earth sintered magnet that can generate magnetic flux having practically useful surface magnetic flux density only on one surface in a thickness direction without increasing the size or weight of a magnet unit.SOLUTION: A rare earth sintered magnet contains rare earth material, and has a constitution that a large number of magnet material particles each of which has an axis of easy magnetization are integrally sintered. The magnet comprises a first surface 11 and a second surface 12 facing each other in a thickness direction β, and within a plane parallel with a width direction α and the thickness direction β, the magnet material particles are magnetized such that an orientation direction of the axis of easy magnetization gradually changes within a range directed from each of both ends 13a, 13b in the width direction α to a central part 13c of the width direction α. The maximum surface magnetic flux density D1 on the first surface 11 and the maximum surface magnetic flux density D2 on the second surface 12 satisfy the relationship of (D1/D2)≥4. The orientation direction of the axis of easy magnetization may be different by 90°±5° or 180°±5° between each of both ends in the width direction and the central part in the width direction.SELECTED DRAWING: Figure 1
Inventors:
FUJIKAWA KENICHI
YAMAMOTO TAKASHI
SAITO SHOICHIRO
OZAKI TAKASHI
KUME KATSUYA
YAMAMOTO TAKASHI
SAITO SHOICHIRO
OZAKI TAKASHI
KUME KATSUYA
Application Number:
JP2018089934A
Publication Date:
November 29, 2018
Filing Date:
May 08, 2018
Export Citation:
Assignee:
NITTO DENKO CORP
International Classes:
H01F41/02; H01F1/057; H01F7/02; H01F13/00
Domestic Patent References:
| JPH0661036A | 1994-03-04 | |||
| JPH05234745A | 1993-09-10 | |||
| JPH0613223A | 1994-01-21 | |||
| JPH0418410U | 1992-02-17 | |||
| JPS617609A | 1986-01-14 | |||
| JP2004250781A | 2004-09-09 | |||
| JP2014150254A | 2014-08-21 | |||
| JPS622213U | 1987-01-08 |
Attorney, Agent or Firm:
Shinichiro Tanaka
Disciple Maru Ken
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda
Hiroshi Uesugi
Naoki Kondo
Takeo Nasu
Teshima Takuji
Disciple Maru Ken
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda
Hiroshi Uesugi
Naoki Kondo
Takeo Nasu
Teshima Takuji