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1. WO2016152976 - RARE-EARTH PERMANENT MAGNET AND ROTARY MACHINE INCLUDING RARE-EARTH PERMANENT MAGNET

Publication Number WO/2016/152976
Publication Date 29.09.2016
International Application No. PCT/JP2016/059391
International Filing Date 24.03.2016
IPC
H02K 1/27 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
KDYNAMO-ELECTRIC MACHINES
1Details of the magnetic circuit
06characterised by the shape, form or construction
22Rotating parts of the magnetic circuit
27Rotor cores with permanent magnets
H01F 7/02 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
7Magnets
02Permanent magnets
H02K 1/22 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
KDYNAMO-ELECTRIC MACHINES
1Details of the magnetic circuit
06characterised by the shape, form or construction
22Rotating parts of the magnetic circuit
H02K 15/03 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
KDYNAMO-ELECTRIC MACHINES
15Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
02of stator or rotor bodies
03having permanent magnets
H01F 1/057 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
047Alloys characterised by their composition
053containing rare earth metals
055and magnetic transition metals, e.g. SmCo5
057and IIIa elements, e.g. Nd2Fe14B
H01F 1/08 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
06in the form of particles, e.g. powder
08pressed, sintered, or bound together
CPC
B22F 3/105
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; ; Presses and furnaces
10Sintering only
105by using electric current ; other than for infra-red radiant energy; , laser radiation or plasma
C22C 38/005
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
005containing rare earths, i.e. Sc, Y, Lanthanides
H01F 1/0536
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
047Alloys characterised by their composition
053containing rare earth metals
0536sintered
H01F 1/0577
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
047Alloys characterised by their composition
053containing rare earth metals
055and magnetic transition metals, e.g. SmCo5
057and IIIa elements, e.g. Nd2Fe14B
0571in the form of particles, e.g. rapid quenched powders or ribbon flakes
0575pressed, sintered or bonded together
0577sintered
H01F 1/086
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
1Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
01of inorganic materials
03characterised by their coercivity
032of hard-magnetic materials
04metals or alloys
06in the form of particles, e.g. powder
08pressed, sintered, or bound together
086sintered
H01F 41/0273
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
41Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
02for manufacturing cores, coils, or magnets
0253for manufacturing permanent magnets
0273Imparting anisotropy
Applicants
  • 日東電工株式会社 NITTO DENKO CORPORATION [JP]/[JP]
Inventors
  • 藤原 誠 FUJIHARA Makoto
  • 藤川 憲一 FUJIKAWA Kenichi
  • 山本 貴士 YAMAMOTO Takashi
  • 齊藤 正一朗 SAITO Shoichiro
Agents
  • 西島 孝喜 NISHIJIMA Takaki
Priority Data
2015-06108024.03.2015JP
2016-03911601.03.2016JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) RARE-EARTH PERMANENT MAGNET AND ROTARY MACHINE INCLUDING RARE-EARTH PERMANENT MAGNET
(FR) AIMANT PERMANENT À BASE DE TERRES RARES ET MACHINE ROTATIVE COMPRENANT UN AIMANT PERMANENT À BASE DE TERRES RARES
(JA) 希土類永久磁石及び希土類永久磁石を有する回転機
Abstract
(EN)
Provided is a permanent magnet that does not undergo performance reduction in a rotary machine, such as a permanent magnet-embedded electric motor, even when an external magnetic field that causes demagnetization of the embedded permanent magnet is applied. Disclosed are: a rare-earth permanent magnet-forming sintered compact made by integrally sintering and molding magnet material particles including a rare-earth substance; a rare-earth permanent magnet obtained by magnetizing said sintered compact; and a rotary machine in which said magnet is embedded. This rare-earth permanent magnet-forming sintered compact is partitioned into a central region in the width direction, and first and second end-section regions located on respective sides of the central region. In the central region, the axis of easy magnetization of magnet material particles included in the central region is oriented in a substantially perpendicular direction to one surface of a sintered compact section that extends in the width direction. In the first end-section region and/or the second end-section region, the axis of easy magnetization of the magnet material particles included in said region(s) is oriented in a direction that converges such that the density of the magnet material particles directed toward said one surface becomes higher than that in the central region. A magnet formed by this rare-earth permanent magnet-forming sintered compact has a higher magnetic flux density in the end-section regions than in the central region, and performance reduction caused by demagnetization is suppressed.
(FR)
L'invention concerne un aimant permanent qui ne subit pas de diminution des performances dans une machine rotative, telle qu'un moteur électrique à aimant permanent intégré, même lorsqu'un champ magnétique externe qui provoque la démagnétisation de l'aimant permanent intégré est appliqué. La présente invention concerne : un compact fritté formant un aimant permanent à base de terres rares fabriqué d'une seule pièce par frittage et moulage de particules de matériau magnétique comprenant une substance à base de terres rares ; un aimant permanent à base de terres rares obtenu par magnétisation dudit compact fritté ; et une machine rotative dans laquelle est intégré ledit aimant. Ledit compact fritté formant un aimant permanent à base de terres rares est divisé en une région centrale dans le sens de la largeur, et en des première et seconde régions de section d'extrémité situées sur les côtés respectifs de la région centrale. Dans la région centrale, l'axe de magnétisation facile des particules de matériau magnétique incluses dans la région centrale est orienté dans une direction sensiblement perpendiculaire à une surface d'une section du compact fritté qui s'étend dans le sens de la largeur. Dans la première région de section d'extrémité et/ou la seconde région de section d'extrémité, l'axe de magnétisation facile des particules de matériau magnétique incluses dans ladite ou lesdites régions est orienté dans une direction qui converge de sorte que la densité des particules du matériau magnétique dirigées vers ladite une surface devienne supérieure à celle dans la région centrale. Un aimant formé par ledit compact fritté formant un aimant permanent à base de terres rares a une densité de flux magnétique plus élevée dans les régions de section d'extrémité que dans la région centrale et une diminution des performances provoquée par la démagnétisation de réduction est supprimée.
(JA)
 永久磁石埋め込み型電動モータのような回転機において、埋め込まれた永久磁石に減磁作用を及ぼす外部磁界が作用しても性能低下を生じない永久磁石を提供する。希土類物質を含む磁石材料粒子が一体に焼結成形された希土類永久磁石形成用焼結体及び該焼結体に着磁することによって得られた希土類永久磁石、並びに該磁石を埋め込んだ回転機を開示する。希土類永久磁石形成用焼結体は、幅方向の中央領域と該中央領域の両側に位置する第1及び第2の端部領域とに区画される。中央領域においては、該中央領域に含まれる磁石材料粒子は、その磁化容易軸が、幅方向に延びる焼結体部分の一表面に対して実質的に直角な方向に配向されており、第1及び第2の端部領域の一方又は両方において、該領域に含まれる磁石材料粒子は、磁化容易軸が該一表面に指向される磁石材料粒子の密度が、中央領域におけるよりも高くなるように集束する方向に配向される。この希土類永久磁石形成用焼結体により形成される磁石においては、端部領域の磁束密度が中央領域より高くなり、減磁による性能低下が抑制される。
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