JP5732979B2 - フェライト焼結磁石及びモータ - Google Patents
フェライト焼結磁石及びモータ Download PDFInfo
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- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
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- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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Description
表面粗さの異なるフェライト焼結磁石を製造して、摩擦による発塵及び変色の度合いを評価した。フェライト焼結磁石は、射出成形によって製造された。以下における比較例は、従来例を意味するものではない。まず、フェライト焼結磁石の製造方法を説明する。出発原料として、Fe2O3粉末と、SrCO3粉末と、La(OH)3粉末と、CaCO3粉末と、Co3O4粉末とを準備した。これらを所定量秤量し、添加物と共に、湿式アトライターで粉砕した後、乾燥させて整粒した。その後、空気中において、1230℃で3時間焼成して顆粒状の仮焼体を得た。
発塵性の度合いは、以下のように評価した。同粒度の砥石により同条件で研磨された試料の2片、又は未研削の試料の2片を100回擦り合わせた。その後、試料の表面に透明テープを貼付してはがし、白色の紙片上に再貼付した。目視によってテープに付着した塵の量を3段階に判別し、多量の塵が付着したテープが得られた試料の評価を、×(発塵低減効果なし)、塵の付着がわずかであるテープが得られた試料の評価を○(発塵低減効果あり)、塵の付着がほとんどないテープが得られた試料の評価を◎(著しい発塵低減効果あり)とした。
変色の度合いは、発塵性の度合いの評価において得られたテープの茶色の濃度を目視で判別することにより評価した。茶色のテープが得られた試料の評価を×(変色低減効果なし)、薄茶色のテープが得られた試料の評価を○(変色低減効果あり)、変色がほとんど確認できないテープが得られた試料の評価を◎(著しい変色低減効果あり)とした。
試料を機器に組み付ける際の汚れの度合いは、以下のようにして評価した。図4は、フェライト焼結磁石による汚れの、低減効果の評価法について説明する図である。汚れ低減効果は、直流ブラシモータのモータケース101に試料100を挿入した後に生じた、モータケース101内面の塵の存在及び汚れを、目視により3段階に判別して評価した。試料100の外周面102がモータケース101の内側に接するようにして、モータケース101の開口部から試料100を挿入した。同粒度の砥石により同条件で研磨された試料又は未研削の試料100個を、同条件の試料と100回擦り合わせた後、同一寸法のモータケースにそれぞれ挿入し、評価を行った。モータケース内面に塵が付着し、汚れの発生が見られる試料の評価を×(汚れ低減効果なし)、モータケース内面に塵がわずかに付着し、汚れの発生がわずかである試料の評価を○(汚れ低減効果あり)、モータケース内面に塵が付着せず、ほとんど汚れを発生させない試料の評価を◎(著しい汚れ低減効果あり)とした。表1に発塵性の度合い、変色の度合い及び汚れの度合いの評価結果を示す。
2 射出成形機
3 磁場印加装置
4 投入口
5 スクリュー
6 押出機
6C 筐体
6H 射出口
7 ペレット
8 金型
9 キャビティ
100 試料
101 モータケース
Claims (3)
- 研磨されていない表面の表面粗さRzが3.5μm以下であることを特徴とするフェライト焼結磁石。
- 前記表面粗さRzは、2.0μm未満である請求項1に記載のフェライト焼結磁石。
- 請求項1又は請求項2に記載のフェライト焼結磁石を用いたモータ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011080726A JP5732979B2 (ja) | 2011-03-31 | 2011-03-31 | フェライト焼結磁石及びモータ |
US13/431,450 US8835001B2 (en) | 2011-03-31 | 2012-03-27 | Ferrite sintered magnet, motor, and method for producing the ferrite sintered magnet |
KR1020120033175A KR20120112226A (ko) | 2011-03-31 | 2012-03-30 | 페라이트 소결 자석, 모터, 및 페라이트 소결 자석을 제조하는 방법 |
CN2012100933654A CN102737807A (zh) | 2011-03-31 | 2012-03-31 | 铁氧体烧结磁铁、电机和制造铁氧体烧结磁铁的方法 |
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JP2011080726A JP5732979B2 (ja) | 2011-03-31 | 2011-03-31 | フェライト焼結磁石及びモータ |
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JP2012216674A JP2012216674A (ja) | 2012-11-08 |
JP5732979B2 true JP5732979B2 (ja) | 2015-06-10 |
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US (1) | US8835001B2 (ja) |
JP (1) | JP5732979B2 (ja) |
KR (1) | KR20120112226A (ja) |
CN (1) | CN102737807A (ja) |
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KR102446182B1 (ko) * | 2015-05-27 | 2022-09-22 | 엘지이노텍 주식회사 | 로터 및 상기 로터를 포함하는 모터 |
KR102067907B1 (ko) | 2018-09-11 | 2020-01-17 | 김성직 | 페라이트 마그네틱 양 단부 면취장치 |
KR20240063421A (ko) | 2022-11-03 | 2024-05-10 | 김성직 | 마그네트 형삭 가공장치용 레일베이스 어셈블리 |
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JPH10125519A (ja) * | 1996-08-30 | 1998-05-15 | Sumitomo Special Metals Co Ltd | フェライト系磁性材料とその製造方法 |
CN1239578A (zh) * | 1997-09-19 | 1999-12-22 | Tdk株式会社 | 磁体粉末、烧结磁体,其制造工艺、粘结磁体、马达和磁记录介质 |
JPWO2002021543A1 (ja) * | 2000-09-08 | 2004-01-15 | Necトーキン株式会社 | 永久磁石、それを磁気バイアス用磁石とした磁気コア、およびそれを用いたインダクタンス部品 |
US7879469B2 (en) * | 2003-02-25 | 2011-02-01 | Tdk Corporation | Ferrite magnet powder, sintered magnet, bond magnet, and magnetic recording medium |
JP2005339607A (ja) * | 2004-05-24 | 2005-12-08 | Fuji Photo Film Co Ltd | 磁気記録媒体 |
JP4215261B2 (ja) * | 2004-10-29 | 2009-01-28 | Tdk株式会社 | フェライト磁性材料及びその製造方法 |
EP1814128B1 (en) * | 2004-11-17 | 2014-05-07 | TDK Corporation | Rare earth sintered magnet |
US7919007B2 (en) * | 2005-12-19 | 2011-04-05 | Tdk Corporation | Ferrite magnetic material |
JP4529906B2 (ja) * | 2006-01-10 | 2010-08-25 | Tdk株式会社 | フェライト部品 |
JP2007270235A (ja) | 2006-03-31 | 2007-10-18 | Tdk Corp | 磁場中成形装置、金型、希土類焼結磁石の製造方法 |
CN101262085B (zh) * | 2007-03-07 | 2016-04-27 | 户田工业株式会社 | 铁氧体成形片材、烧结铁氧体基板和天线模块 |
JP4678003B2 (ja) * | 2007-03-27 | 2011-04-27 | Tdk株式会社 | 磁石の製造方法及び磁性粒子を成型するための成型装置 |
JP4685893B2 (ja) * | 2008-03-31 | 2011-05-18 | Tdk株式会社 | 焼結磁石の製造方法 |
US8986568B2 (en) * | 2010-03-31 | 2015-03-24 | Tdk Corporation | Sintered magnet and method for producing the sintered magnet |
-
2011
- 2011-03-31 JP JP2011080726A patent/JP5732979B2/ja active Active
-
2012
- 2012-03-27 US US13/431,450 patent/US8835001B2/en active Active
- 2012-03-30 KR KR1020120033175A patent/KR20120112226A/ko not_active Application Discontinuation
- 2012-03-31 CN CN2012100933654A patent/CN102737807A/zh active Pending
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JP2012216674A (ja) | 2012-11-08 |
KR20120112226A (ko) | 2012-10-11 |
US20120248913A1 (en) | 2012-10-04 |
CN102737807A (zh) | 2012-10-17 |
US8835001B2 (en) | 2014-09-16 |
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