JP2016531418A - 径方向磁化及び強化機械強度を有する環状焼結磁石 - Google Patents
径方向磁化及び強化機械強度を有する環状焼結磁石 Download PDFInfo
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Abstract
Description
−半径方向の第1の磁気異方性度D1を有する強磁性体から作成された主環状部分と、
−磁石の前記主部分に固定された環状強化部分とを有し、強化部分が、主部分を形成する強磁性体と同じ主磁性相を有しかつ半径方向に第2の磁気異方性度D2を有する強磁性体から作成され、第1の磁気異方性度D1は、第2の磁気異方性度D2より高い。
−R2F14B主磁性相を有するR−Fe−B合金。Rは希土類系の元素である。
−RCo5及びR2Co17主磁性相を有するR−Co合金。Rは希土類系の元素である。
−MFe12O19主磁性相を有するヘキサフェライト。ここで、M=Ba又はSr。
−第1の強磁性体粉末から作成され、ブランクの組立体の半径方向に第1の磁気異方性度D1を有する主環状部分のブランクと、
−磁石の主部分の前記ブランクに隣接した環状強化部分のブランクとを有し、強化部分のブランクが、第1の強磁性体粉末と同じ主磁性相を有し、ブランクの組立体の半径方向に第2の磁気異方性度D2を有する第2の強磁性体粉末から作成され、第1の磁気異方性度D1は、磁気異方性D2より高い。
−主磁性相がR2F14BであるR−Fe−B合金と(Rは希土類系の元素である)、
−主磁性相がRCo5とR2Co17を有するRとCoの合金と(Rは希土類系の元素である)、
−主磁性相がMFe12O19であるヘキサフェライトと(M=Ba又はSrである)を含む3つのタイプの化合物のうちの1つに属する。
SmCo型強磁性体は、検討される全ての材料のなかで最低の引張強さ(典型的には、35MPa)を有し、したがって、半径のRint/Rext比率が0.9未満の径方向配向を有するリングを焼結によって作成できない。以下の例では、内部分にSmCo等方性強化を使用することによって、0.8のRint/Rext比を有し半径方向(D=1)に完全に配向された磁界を有するSmCo型リングを作成できることが示される。以下の表は、強化材を有するリング内で達した引張応力の最大値を、強化材の内半径R’intの関数として示す。
ヘキサフェライトの引張強さは、SmCo材料より高い。しかしながら、これは、粒度と形状を含む幾つかの微小構造パラメータに依存する。
NdFeB型材料は、高い引張強さ(D=1の場合に150MPaを超える)を有する。極限強さは、アライメント度が減少するときに大幅に増大する。これは、等方性材料(D=0.5)では330MPaに達する。
ρ:材料密度
R:リング内の半径位置
Ω:角速度
4 主環状部分
6 環状強化部分
Claims (16)
- 残留磁界の径方向配向を有する焼結環状磁石(1)であって、
半径方向の第1の磁気異方性度D1を有する強磁性体から作成された主環状部分(4)と、
前記磁石の前記主部分に固定された環状強化部分(6)とを有し、前記強化部分が、前記主部分を形成する前記強磁性体と同じ主磁性相を有しかつ半径方向の第2の磁気異方性度D2を有する強磁性体から作成され、前記第1の磁気異方性度D1が第2の磁気異方性度D2より高い磁石。 - 前記強化部分(6)が、前記磁石の前記主部分(4)の内周又は外周に配置された、請求項1に記載の磁石。
- 前記主部分(4)の平均半径厚さと前記強化部分(6)の平均半径厚さとの比率が、0.1〜5である、請求項2に記載の磁石。
- 前記磁石の前記主部分(4)の内径と外径の比率が、0.5〜0.85である、請求項1〜3のいずれか一項に記載の磁石。
- 前記主部分と前記強化部分を形成する前記強磁性体が、
R2F14B主磁性相を有するR−Fe−B合金であって、Rが希土類系の元素である合金、
RCo5及びR2Co17主磁性相を有するR−Co合金であって、Rが希土類系の元素である合金及び、
MFe12O19主磁性相を有するヘキサフェライトであって、M=Ba又はSrである合金の3つのタイプの化合物のうちの1つに属する、請求項1〜4のいずれか一項に記載の磁石。 - 前記磁石の前記主部分(4)とその強化部分(6)と境界(10)が構造化された、請求項1〜5のいずれか一項に記載の磁石。
- 前記境界(10)が、前記境界に沿って交互に配置された突出部(12)と凹部(14)を有する、請求項6に記載の磁石。
- 前記第1の磁気異方性度D1が0.8を超え、前記第2の磁気異方性度D2が0.8未満であり、2つの間の比率が、好ましくは1〜2である、請求項1〜7のいずれか一項に記載の磁石。
- 請求項1〜8のいずれか一項に記載の環状焼結磁石を得るブランク(100)の組立体であって、
第1の強磁性体粉末から作成され、前記ブランクの前記組立体の半径方向に第1の磁気異方性度D1を有する主環状部分(4’)のブランクと、
前記磁石の前記主部分(4’)の前記ブランクに隣接した前記環状強化部分(6’)のブランクとを含み、前記強化部分の前記ブランクが、前記第1の強磁性体粉末と同じ主磁性相を有し、前記ブランクの前記組立体の半径方向の第2の磁気異方性度D2を有する第2の強磁性体粉末から作成され、前記第1の磁気異方性度D1が、前記磁気異方性度D2より高く、前記第1と第2の粉末を構成する前記強磁性体が、
前記主磁性相がR2F14BであるR−Fe−B合金であって、Rが希土類系の元素である合金、
前記主磁性相がRCo5とR2Co17を有するRとCoの合金であって、Rが希土類系の元素である合金及び、
前記主磁性相がMFe12O19であるヘキサフェライト(M=Ba又はSrである)の3つのタイプの化合物のうちの1つに属する組立体。 - 前記主部分と前記強化部分(4’,6’)の前記ブランクが、1つ以上の粉末成形技術を使用して、好ましくは粉末射出又は粉末冷間圧縮によって作成され、前記ブランクが共焼結によって高密度化された、請求項1〜9のいずれか一項に記載の磁石(1)を製造する方法。
- 前記強化部分(6’)の前記ブランクと前記主部分(4’)の前記ブランクが、共射出成形によって作成され、前記主部分(4’)の前記ブランクが、前記強磁性体の異方性粉末P1を含む第1の原料から作成され、前記強化部分(6’)の前記ブランクが、前記異方性粉末P1と同じ主磁性相を有する強磁性体の等方性粉末P2を含む第2の原料から作成される、請求項10に記載の方法。
- 前記強化部分(6’)の前記ブランクと前記主部分(4’)の前記ブランクが、共射出成形によって作成され、前記主部分(4’)の前記ブランクが、前記強磁性体の異方性粉末P1と第1の射出媒介物V1とを含む第1の原料から作成され、前記強化部分(6’)の前記ブランクが、前記異方性粉末P1と、磁界下で磁化容易軸を前記磁石の前記半径方向に向ける粉末粒子の性質が前記第1の媒介物V1の性質より弱くなるように選択された第2の射出媒介物又はV2とを含む第2の原料から作成された、請求項10に記載の方法。
- 前記強化部分(6’)の前記ブランクと前記主部分(4’)の前記ブランクが、共射出成形によって作成され、前記主部分(4’)の前記ブランクが、前記強磁性体の異方性粉末P1と第1の射出媒介物V1とを含む第1の原料から作成され、前記強化部分(6’)の前記ブランクが、同じ異方性粉末P1と同じ第1の射出媒介物V1を含む第2の原料から作成され、前記第1の原料中の粉末含有比率Tc1が、前記第2の原料中の前記第2の粉末含有比率Tc2と異なり、その結果、磁界下で磁化容易軸を前記磁石の前記半径方向に向ける粉末粒子の性質が、前記第1の原料の性質より弱くなる、請求項10に記載の方法。
- 前記強化部分(6’)の前記ブランクが、前記主部分(4’)の前記ブランクを作成するために前記型の一部分として使用される前に作成される、請求項10に記載の方法。
- 前記強化部分(6’)の前記ブランクが、前記主部分の前記ブランクを製造するための型として使用される前に部分的に焼成される、請求項14に記載の方法。
- 前記主部分が製造されるとき、前記部分焼結された強化部分(6’)の前記ブランクが、前記主部分の前記ブランクの前記粒子の前記磁化容易軸を前記磁石の半径方向に配向するように磁化された、請求項15に記載の方法。
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FR3068539A1 (fr) * | 2017-06-30 | 2019-01-04 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Convertisseur d'energie electromagnetique |
EP3503140A1 (en) * | 2017-12-22 | 2019-06-26 | Siemens Gamesa Renewable Energy A/S | Sintered magnetic body, magnet, electrical machine, wind turbine and method for manufacturing a sintered magnetic body |
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JP2005237096A (ja) * | 2004-02-19 | 2005-09-02 | Mitsubishi Electric Corp | リング型焼結磁石及びその製造方法 |
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CN105393318A (zh) | 2016-03-09 |
EP3020055A1 (fr) | 2016-05-18 |
CN105393318B (zh) | 2018-03-16 |
JP6389251B2 (ja) | 2018-09-12 |
FR3008224A1 (fr) | 2015-01-09 |
US20160148735A1 (en) | 2016-05-26 |
EP3020055B1 (fr) | 2017-10-11 |
FR3008224B1 (fr) | 2015-08-07 |
WO2015004054A1 (fr) | 2015-01-15 |
US9748030B2 (en) | 2017-08-29 |
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