JP4721456B2 - 圧粉磁心の製造方法 - Google Patents
圧粉磁心の製造方法 Download PDFInfo
- Publication number
- JP4721456B2 JP4721456B2 JP2007070878A JP2007070878A JP4721456B2 JP 4721456 B2 JP4721456 B2 JP 4721456B2 JP 2007070878 A JP2007070878 A JP 2007070878A JP 2007070878 A JP2007070878 A JP 2007070878A JP 4721456 B2 JP4721456 B2 JP 4721456B2
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- JP
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- Prior art keywords
- powder
- resin
- surface area
- resin powder
- magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000428 dust Substances 0.000 title claims description 26
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000843 powder Substances 0.000 claims description 100
- 239000011347 resin Substances 0.000 claims description 78
- 229920005989 resin Polymers 0.000 claims description 78
- 239000006247 magnetic powder Substances 0.000 claims description 31
- 239000002245 particle Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 9
- 239000011812 mixed powder Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 74
- 239000011162 core material Substances 0.000 description 55
- 229910052742 iron Inorganic materials 0.000 description 32
- 230000004907 flux Effects 0.000 description 29
- 239000000523 sample Substances 0.000 description 27
- 238000009413 insulation Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 11
- 229920001721 polyimide Polymers 0.000 description 10
- 239000004642 Polyimide Substances 0.000 description 9
- 229920001187 thermosetting polymer Polymers 0.000 description 9
- 229920001169 thermoplastic Polymers 0.000 description 7
- 239000004416 thermosoftening plastic Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- -1 phosphate compound Chemical class 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—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
- 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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
- Developing Agents For Electrophotography (AREA)
Description
W=(k1Bm2t2 /ρ)f2+k2Bm1.6f…(1)
本発明は、上記要請に鑑みてなされたものであり、樹脂を軟磁性粉末間により一層均一に介在させることにより、絶縁性を向上させて高周波領域での渦電流損Weおよびそれに起因する発熱を低減して磁心の長寿命化および圧粉磁心を用いた製品の高性能化を実現するとともに、軟磁性粉末間に均一に介在させる樹脂を薄くすることにより、十分な磁束密度を確保し、圧粉磁心を用いた製品の高性能化を実現した圧粉磁心の製造方法を提供することを目的としている。
樹脂粉末として、市販の(熱可塑性または熱硬化性)ポリイミド粉末(比表面積:0.3m2/cm3)を用意した。また、粉砕条件を変えて比表面積を0.5〜5m2/cm3まで変えるとともに、メジアン径を5〜30μmに調整した(熱可塑性 or 熱硬化性)ポリイミド粉末を用意した。
第1実施例の比表面積が2.0m2/cm3の(熱可塑性または熱硬化性)ポリイミド粉末について、メジアン径を2〜100μmまで変えて調整したものを用意した。これらの樹脂粉末を第1実施例で用いた軟磁性粉末に0.1体積%添加、混合した原料粉末を用いて、第1実施例と同じ条件で試料作製を行い、表3に示す試料番号08〜12の試料を得た。これらの試料について、第1実施例と同様の条件で直流磁気特性、交流磁気特性および電気特性について調査した。その結果を表4に示す。なお、表3および表4に、第1実施例の試料番号05の試料の結果を併せて示した。
第1実施例の比表面積が2.0m2/cm3の(熱可塑性または熱硬化性)ポリイミド粉末について、メジアン径を3.5μmにするとともに最大粒径を15〜150μmまで変化さ変化させて調整したものを用意した。これらの樹脂粉末を第1実施例で用いた軟磁性粉末に0.3体積%添加、混合した原料粉末を用いて、第1実施例と同じ条件で試料作製を行い、表5に示す試料番号13〜15の試料を得た。これらの試料について、第1実施例と同様の条件で直流磁気特性、交流磁気特性および電気特性について調査した。その結果を表6に示す。なお、表5および表6に、第1実施例の試料番号05の試料の結果を併せて示した。
第1実施例の比表面積が2.0m2/cm3の(熱可塑性または熱硬化性)ポリイミド粉末について、メジアン径を3.5μm、最大粒径を15μmに調整したものを用意し、第1実施例で用いた軟磁性粉末に添加量を0.005〜5体積%まで変えて添加、混合した原料粉末を用意した。これらの原料粉末を用いて、第1実施例と同じ条件で試料作製を行い、表7に示す試料番号16〜25の試料を得た。また比較のため、従来例として、第1実施例の比表面積が0.3m2/cm3の(熱可塑性または熱硬化性)ポリイミド粉末についても同様にメジアン径を30μm、最大粒径を100μmに調整するとともに、軟磁性粉末に添加量を0.005〜5体積%まで変えた試料(試料番号26〜35)を作製した。これらの試料について、第1実施例と同様の条件で直流磁気特性、交流磁気特性および電気特性について調査した。その結果を表8に示す。なお、表7および表8に、第1実施例の試料番号01および05の試料の結果を併せて示した。
Claims (2)
- 軟磁性粉末と樹脂粉末とを含む混合粉末を用い、混合粉末を所望の形状に圧粉成形および加熱する圧粉磁心の製造方法において、
前記樹脂粉末は、メジアン径で30μm以下で、かつ最大粒径が100μm以下であるとともに、比表面積が1.0m2/cm3以上の粉末であり、その添加量が0.005〜2体積%(0.01体積%以上を除く)であることを特徴とする圧粉磁心の製造方法。 - 前記樹脂粉末が、比表面積が1.5m2/cm3以上の粉末であることを特徴とする請求項1に記載の圧粉磁心の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007070878A JP4721456B2 (ja) | 2007-03-19 | 2007-03-19 | 圧粉磁心の製造方法 |
US12/076,332 US8062583B2 (en) | 2007-03-19 | 2008-03-17 | Method for producing soft magnetic powdered core |
CNA2008100879070A CN101299367A (zh) | 2007-03-19 | 2008-03-19 | 压粉磁芯的制造方法 |
EP08005181A EP1973129A1 (en) | 2007-03-19 | 2008-03-19 | Method for producing soft magnetic powdered core |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007070878A JP4721456B2 (ja) | 2007-03-19 | 2007-03-19 | 圧粉磁心の製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008235455A JP2008235455A (ja) | 2008-10-02 |
JP4721456B2 true JP4721456B2 (ja) | 2011-07-13 |
Family
ID=39529337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007070878A Active JP4721456B2 (ja) | 2007-03-19 | 2007-03-19 | 圧粉磁心の製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US8062583B2 (ja) |
EP (1) | EP1973129A1 (ja) |
JP (1) | JP4721456B2 (ja) |
CN (1) | CN101299367A (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011077601A1 (ja) * | 2009-12-25 | 2011-06-30 | 株式会社タムラ製作所 | 圧粉磁心及びその製造方法 |
CN108288530B (zh) * | 2013-09-27 | 2020-06-09 | 日立化成株式会社 | 压粉磁芯、以及磁芯用压粉体的制造方法 |
US9677523B2 (en) | 2014-05-30 | 2017-06-13 | Cummins Inc. | Fuel injector including an injection control valve having an improved stator core |
US20210065942A1 (en) * | 2017-12-22 | 2021-03-04 | Querdenkfabrik Ag | Method for the production of a soft magnetic formed part and soft magnetic formed part |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002280209A (ja) * | 2001-03-21 | 2002-09-27 | Kobe Steel Ltd | 高強度圧粉磁心用粉末、高強度圧粉磁心とその製造方法 |
JP2004146804A (ja) * | 2002-09-30 | 2004-05-20 | Hitachi Powdered Metals Co Ltd | 圧粉磁心の製造方法 |
JP2005094923A (ja) * | 2003-09-17 | 2005-04-07 | Denso Corp | 電磁アクチュエータ、電磁アクチュエータの製造方法、および燃料噴射弁 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4273527A (en) * | 1979-09-04 | 1981-06-16 | Meenan Cyril F | Multiple fuel burning system for furnaces or the like |
JP3690562B2 (ja) | 1998-03-02 | 2005-08-31 | 日立粉末冶金株式会社 | 高周波用圧粉磁心の製造方法 |
JP3421944B2 (ja) | 1998-06-10 | 2003-06-30 | 株式会社日立製作所 | 圧粉磁心の製造方法及び製造装置 |
JP3986043B2 (ja) | 2001-02-20 | 2007-10-03 | 日立粉末冶金株式会社 | 圧粉磁心及びその製造方法 |
-
2007
- 2007-03-19 JP JP2007070878A patent/JP4721456B2/ja active Active
-
2008
- 2008-03-17 US US12/076,332 patent/US8062583B2/en active Active
- 2008-03-19 EP EP08005181A patent/EP1973129A1/en not_active Withdrawn
- 2008-03-19 CN CNA2008100879070A patent/CN101299367A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002280209A (ja) * | 2001-03-21 | 2002-09-27 | Kobe Steel Ltd | 高強度圧粉磁心用粉末、高強度圧粉磁心とその製造方法 |
JP2004146804A (ja) * | 2002-09-30 | 2004-05-20 | Hitachi Powdered Metals Co Ltd | 圧粉磁心の製造方法 |
JP2005094923A (ja) * | 2003-09-17 | 2005-04-07 | Denso Corp | 電磁アクチュエータ、電磁アクチュエータの製造方法、および燃料噴射弁 |
Also Published As
Publication number | Publication date |
---|---|
JP2008235455A (ja) | 2008-10-02 |
US8062583B2 (en) | 2011-11-22 |
CN101299367A (zh) | 2008-11-05 |
US20080232995A1 (en) | 2008-09-25 |
EP1973129A1 (en) | 2008-09-24 |
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