JP2010135529A - Nd系焼結磁石及びその製造方法 - Google Patents
Nd系焼結磁石及びその製造方法 Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910052692 Dysprosium Inorganic materials 0.000 claims abstract description 51
- 229910052771 Terbium Inorganic materials 0.000 claims abstract description 47
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- H01F41/02—Apparatus 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 for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus 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 for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0293—Apparatus 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 for manufacturing cores, coils, or magnets for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
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- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
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- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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Abstract
【効果】本発明は、永久磁石回転機に適した、永久磁石の残留磁束密度の低下がなく、保磁力が大きく、特に永久磁石端部の保磁力が大きくなり、高温でも減磁しにくい永久磁石回転機用のNd系焼結磁石を提供することができる。
【選択図】図1
Description
Nd系焼結磁石の残留磁束密度増大は、Nd2Fe14B化合物の体積率増大と結晶配向度向上により達成され、これまでに種々のプロセスの改善が行われてきている。保磁力の増大に関しては、結晶粒の微細化を図る、Nd量を増やした組成合金を用いる、あるいは効果のある元素を添加する等、様々なアプローチがある中で、現在最も一般的な手法はDyやTbでNdの一部を置換した組成合金を用いることである。Nd2Fe14B化合物のNdをこれらの元素で置換することで、化合物の異方性磁界が増大し、保磁力も増大する。一方で、DyやTbによる置換は化合物の飽和磁気分極を減少させる。従って、上記手法で保磁力の増大を図る限りでは残留磁束密度の低下は避けられない。
請求項1:
Nd系焼結磁石ブロックに対し、磁化方向に垂直な面を除いた表面にDy又はTb酸化物粉末あるいはDy又はTbフッ化物の粉末あるいはDy又はTbを含む合金粉末を被覆し、その後高温処理してDy又はTbをブロック内部に拡散させ、次いで磁石体の磁化方向に垂直な面でブロックを切断して、切断面の保磁力が外周部で高く内周部ほど低くなる分布をもち、磁化方向には一定の保磁力分布をもつNd系焼結磁石を得ることを特徴とするNd系焼結磁石の製造方法。
請求項2:
ブロックを切断して得られた磁石片の磁化方向に垂直な面を研削加工し、上記磁石片をC型又はD型の形状にしたことを特徴とする請求項1記載のNd系焼結磁石の製造方法。
請求項3:
上記磁石ブロックの大きさが、Dy又はTbが拡散する磁化方向に垂直な方向の最大寸法が100mm以下、磁化方向の最大長さが30mm以上である請求項1又は2記載のNd系焼結磁石の製造方法。
請求項4:
請求項1記載の製造方法によって得られた、切断面の保磁力が外周部で高く内周部ほど低くなる分布をもち、磁化方向には一定の保磁力分布をもつことを特徴とするNd系焼結磁石。
請求項5:
磁化方向に垂直な面が研削加工され、C型又はD型の形状に形成された請求項4記載のNd系焼結磁石。
請求項6:
永久磁石回転機の永久磁石用である請求項4又は5記載のNd系焼結磁石。
このようなNd系焼結磁石ブロックを得る方法としては、公知の方法が採用し得る。
<実施例及び比較例の磁気特性>
純度99質量%以上のNd、Co、Al、Feメタルとフェロボロンを所定量秤量してAr雰囲気中で高周波溶解し、この合金溶湯をAr雰囲気中で銅製単ロールに注湯するいわゆるストリップキャスト法により薄板状の合金とした。得られた合金の組成はNdが13.5原子%、Coが1.0原子%、Alが0.5原子%、Bが5.8原子%、Feが残部であり、これを合金Aと称する。合金Aに水素を吸蔵させた後、真空排気を行いながら500℃まで加熱して部分的に水素を放出させる、いわゆる水素粉砕により30メッシュ以下の粗粉とした。更に純度99質量%以上のNd、Tb、Fe、Co、Al、Cuメタルとフェロボロンを所定量秤量し、Ar雰囲気中で高周波溶解した後、鋳造した。得られた合金の組成はNdが20原子%、Tbが10原子%、Feが24原子%、Bが6原子%、Alが1原子%、Cuが2原子%、Coが残部であり、これを合金Bと称する。合金Bは窒素雰囲気中、ブラウンミルを用いて30メッシュ以下に粗粉砕された。
本発明の磁石M1、M2及び比較例の磁石P1を永久磁石モータに組み込んだ時のモータ特性について説明する。永久磁石モータは図4に示す表面磁石型モータである。ロータは、0.5mmの電磁鋼板を積層したものの表面に永久磁石が貼り付けられており6極構造となっている。ロータの外径寸法は45mm、長さ50mmとなっている。ステータは、0.5mmの電磁鋼板を積層した9スロット構造で、各ティースには集中巻きでコイルが15ターン巻かれており、コイルはU相,V相,W相の3相Y結線となっている。ロータとステータの空隙は1mmである。図4に示すコイルの黒丸印はコイルの巻き方向が手前、×印はコイルの巻き方向が奥であることを意味している。コイルに電流を流すと、ステータコア部分に書いた矢印の方向に界磁され、回転子を反時計回りに回転させる。このとき、永久磁石セグメントの回転方向の後方(図4の磁石において○で囲った部分)は界磁が永久磁石の磁化と逆方向になるので減磁しやすい状況になっている。
本発明の磁石M1、M2及び比較例の磁石P1を永久磁石モータに組み込んだ時のモータ特性について説明する。永久磁石モータは図6に示すもので、ステータは図4のD型磁石を用いたモータと同じものである。ロータは、0.5mmの電磁鋼板を積層したものの表面にC型の永久磁石が貼り付けられており、6極構造となっている。ロータの外径寸法は45mm、長さ50mmとなっている。
2 磁石
3 回転子
10 ロータヨーク
11 ステータコア
12 コイル
13 固定子
14 ステータヨーク
100 Nd系焼結磁石ブロック
100a 磁石片
Claims (6)
- Nd系焼結磁石ブロックに対し、磁化方向に垂直な面を除いた表面にDy又はTb酸化物粉末あるいはDy又はTbフッ化物の粉末あるいはDy又はTbを含む合金粉末を被覆し、その後高温処理してDy又はTbをブロック内部に拡散させ、次いで磁石体の磁化方向に垂直な面でブロックを切断して、切断面の保磁力が外周部で高く内周部ほど低くなる分布をもち、磁化方向には一定の保磁力分布をもつNd系焼結磁石を得ることを特徴とするNd系焼結磁石の製造方法。
- ブロックを切断して得られた磁石片の磁化方向に垂直な面を研削加工し、上記磁石片をC型又はD型の形状にしたことを特徴とする請求項1記載のNd系焼結磁石の製造方法。
- 上記磁石ブロックの大きさが、Dy又はTbが拡散する磁化方向に垂直な方向の最大寸法が100mm以下、磁化方向の最大長さが30mm以上である請求項1又は2記載のNd系焼結磁石の製造方法。
- 請求項1記載の製造方法によって得られた、切断面の保磁力が外周部で高く内周部ほど低くなる分布をもち、磁化方向には一定の保磁力分布をもつことを特徴とするNd系焼結磁石。
- 磁化方向に垂直な面が研削加工され、C型又はD型の形状に形成された請求項4記載のNd系焼結磁石。
- 永久磁石回転機の永久磁石用である請求項4又は5記載のNd系焼結磁石。
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JP2008309338A JP5262643B2 (ja) | 2008-12-04 | 2008-12-04 | Nd系焼結磁石及びその製造方法 |
MYPI2010003037A MY153537A (en) | 2008-12-04 | 2009-11-27 | Nd based sintered magnet and its preparation |
DK09830345.6T DK2254131T3 (en) | 2008-12-04 | 2009-11-27 | PROCEDURE FOR MANUFACTURING AN ND-BASED SINTER MAGNET |
EP09830345.6A EP2254131B1 (en) | 2008-12-04 | 2009-11-27 | MANUFACTURING METHOD OF A Nd-BASED SINTERED MAGNET |
ES09830345.6T ES2661192T3 (es) | 2008-12-04 | 2009-11-27 | Método de fabricación de un imán a base de Nd sinterizado |
KR1020107015042A KR101495613B1 (ko) | 2008-12-04 | 2009-11-27 | Nd계 소결 자석 및 그 제조방법 |
CN200980104188.1A CN101939804B (zh) | 2008-12-04 | 2009-11-27 | Nd基烧结磁体及其制造方法 |
US12/673,315 US8695210B2 (en) | 2008-12-04 | 2009-11-27 | Method of manufacturing an Nd based sintered magnet |
PCT/JP2009/070010 WO2010064578A1 (ja) | 2008-12-04 | 2009-11-27 | Nd系焼結磁石及びその製造方法 |
TW098141376A TWI455160B (zh) | 2008-12-04 | 2009-12-03 | 釹系燒結磁石及其製造方法 |
TW103124518A TWI497541B (zh) | 2008-12-04 | 2009-12-03 | 釹系燒結磁石之製造方法 |
US14/187,573 US9953750B2 (en) | 2008-12-04 | 2014-02-24 | Nd based sintered magnet |
PH12015500458A PH12015500458A1 (en) | 2008-12-04 | 2015-03-03 | Nd-based sintered magnet and its preparation |
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ES2661192T3 (es) | 2018-03-27 |
PH12015500458B1 (en) | 2015-08-03 |
WO2010064578A1 (ja) | 2010-06-10 |
PH12015500458A1 (en) | 2015-08-03 |
EP2254131A1 (en) | 2010-11-24 |
EP2254131B1 (en) | 2017-12-20 |
TW201443941A (zh) | 2014-11-16 |
EP2254131A4 (en) | 2016-08-24 |
TWI497541B (zh) | 2015-08-21 |
CN101939804B (zh) | 2014-04-16 |
US8695210B2 (en) | 2014-04-15 |
KR101495613B1 (ko) | 2015-02-25 |
CN101939804A (zh) | 2011-01-05 |
TWI455160B (zh) | 2014-10-01 |
US9953750B2 (en) | 2018-04-24 |
MY153537A (en) | 2015-02-27 |
US20110210810A1 (en) | 2011-09-01 |
KR20110096104A (ko) | 2011-08-29 |
TW201036009A (en) | 2010-10-01 |
JP5262643B2 (ja) | 2013-08-14 |
DK2254131T3 (en) | 2018-02-12 |
US20140167895A1 (en) | 2014-06-19 |
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