EP0004272A2 - Méthode de fabrication de masses comprimées ayant des propriétés magnétiques douces - Google Patents

Méthode de fabrication de masses comprimées ayant des propriétés magnétiques douces Download PDF

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Publication number
EP0004272A2
EP0004272A2 EP79100156A EP79100156A EP0004272A2 EP 0004272 A2 EP0004272 A2 EP 0004272A2 EP 79100156 A EP79100156 A EP 79100156A EP 79100156 A EP79100156 A EP 79100156A EP 0004272 A2 EP0004272 A2 EP 0004272A2
Authority
EP
European Patent Office
Prior art keywords
iron powder
soft magnetic
grain size
magnetic properties
average grain
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.)
Granted
Application number
EP79100156A
Other languages
German (de)
English (en)
Other versions
EP0004272B1 (fr
EP0004272A3 (en
Inventor
Friedrich J. Dr. Esper
Hans-Martin Dr. Wiedenmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0004272A2 publication Critical patent/EP0004272A2/fr
Publication of EP0004272A3 publication Critical patent/EP0004272A3/xx
Application granted granted Critical
Publication of EP0004272B1 publication Critical patent/EP0004272B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • 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
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • 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
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/28—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder dispersed or suspended in a bonding agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • 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
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/33—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials mixtures of metallic and non-metallic particles; metallic particles having oxide skin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • 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
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/58—Processes of forming magnets

Definitions

  • the invention is based on a method according to the preamble of the main claim.
  • Soft magnetic plastic-bonded mass cores are already known which contain 95 to 99.5% by weight of carbonyl iron, the rest of organic binders.
  • the molding compound is also not flowable due to the very high proportion of filler and can therefore not be easily and uniformly filled into complicated shapes. It must also be compressed with pressures from 5000 to 18000 bar.
  • the mechanical strength of the components made from these molding compounds is low and the components are very brittle.
  • the magnetic properties of these mass cores cannot be adapted to the given extent to the desired extent.
  • Cores made of soft magnetic sintered ferrite are also known. However, these have a lower magnetic saturation polarization, a lower mechanical strength and a higher temperature dependence of the magnetic parameters.
  • the design options are limited, they can only be manufactured with larger dimensional tolerances and are relatively difficult to machine.
  • Such cores are also made from transformer or dynamo sheet. However, due to eddy current losses, these can only be used up to approx. 1 kHz. In addition, such cores are limited to certain designs and require packaging, which may is expensive. Thin Ni-Fe alloy sheets with a sheet thickness of up to 0.03 mm, which can also be used for frequencies up to 100 kHz and also have higher permeabilities, are expensive and difficult to process.
  • the method according to the invention with the characterizing features of the main claim has the advantage that it can be used to inexpensively produce magnets that can be used in sheared magnetic circuits with alternating magnetization up to frequencies of 100 kHz. Due to the flowability of the molding compound, it is easily possible, using the methods customary in plastics technology, to produce complex-shaped components from the molding compound with dimensional accuracy.
  • the pressure to be applied is relatively low at 200 to 2000 bar compared to the plastic-bonded mass cores mentioned above. By varying the starting components, the filler and the pressure, the magnetic properties can be adapted to the existing requirements to a large extent.
  • the cores according to the invention Compared to soft magnetic sintered ferrites, the cores according to the invention have a higher magnetic saturation polarization, better mechanical strength properties and a lower temperature dependence of the magnetic parameters. The possibilities of shaping are further extended, the cores can be manufactured with closer dimensional tolerances and can be machined more easily if necessary. In addition, the mass cores produced by the method according to the invention can be used more advantageously in circles with DC bias because of their higher saturation polarization than the soft magnetic sintered ferrites. Compared to cores made from conventional transformer or dynamo sheets, the high frequency range in which the ground cores produced by the method according to the invention can be used and the possibility of producing cores with complicated designs are particularly worth mentioning.
  • a mixture of an iron powder, which was obtained by atomization, as a sponge or electrolyte iron powder, and 30% by weight carbonyl iron powder with an average grain size of preferably 90 ⁇ m are mixed with about 50% by volume of a liquid polyester resin brought about 100 ° C heated press and pressed at a pressure of 1000 bar for about 40 seconds.
  • the excess polyester resin is pressed out through the column of the mold, the column having a width which is smaller than the average grain size of the magnetic powder, but so large that the excess build-up time from 1 to 30 seconds through this column Binding resin can leak.
  • This squeezing is essential since otherwise the high degrees of filling cannot be achieved while at the same time achieving sufficient flowability of the molding compound at the beginning of the pressing process.
  • the hardened magnetic body can be removed from the mold.
  • a magnetic body is produced from a mixture of the above iron powder with 10% by weight carbonyl iron powder in approx. 50% by volume phenolic resin at a pressure of 2000 bar.
  • the temperature of the mold is 140 ° C in this case.
  • This example shows that it is also possible to get by without carbonyl iron powder.
  • sieved iron powder of the type described above was used in 50% by volume. Polyester used. The pressure was 500 bar, the temperature of the mold corresponded to that of Example 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Soft Magnetic Materials (AREA)
EP79100156A 1978-03-22 1979-01-19 Méthode de fabrication de masses comprimées ayant des propriétés magnétiques douces Expired EP0004272B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2812445A DE2812445C2 (de) 1978-03-22 1978-03-22 Verfahren zur Herstellung von Preßmassen mit weichmagnetischen Eigenschaften
DE2812445 1978-03-22

Publications (3)

Publication Number Publication Date
EP0004272A2 true EP0004272A2 (fr) 1979-10-03
EP0004272A3 EP0004272A3 (en) 1979-10-31
EP0004272B1 EP0004272B1 (fr) 1983-10-05

Family

ID=6035124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79100156A Expired EP0004272B1 (fr) 1978-03-22 1979-01-19 Méthode de fabrication de masses comprimées ayant des propriétés magnétiques douces

Country Status (3)

Country Link
US (1) US4320080A (fr)
EP (1) EP0004272B1 (fr)
DE (2) DE2812445C2 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044592A1 (fr) * 1980-07-22 1982-01-27 Koninklijke Philips Electronics N.V. Composant électromagnétique à liant de résine synthétique et procédé pour sa fabrication
EP0220321A4 (fr) * 1985-04-19 1988-11-02 Kanegafuchi Chemical Ind Composition de materiau magnetique souple et son procede de moulage.
EP0354929A4 (fr) * 1987-10-30 1990-06-27 Ruffini & Assoc R S Compositions et procedes de production de pieces rapportees d'inducteurs.
WO1996019308A1 (fr) * 1994-12-19 1996-06-27 Aga Aktiebolag Procede, y compris le chauffage et le refroidissement, pour la production de pieces moulees par injection
FR2740259A1 (fr) * 1995-10-24 1997-04-25 Thomson Csf Noyau magnetique mixte
DE102014211116A1 (de) * 2014-06-11 2015-12-17 SUMIDA Components & Modules GmbH Verfahren zum Bilden eines Rahmenkerns mit Mittelschenkel für ein induktives Bauelement und entsprechend hergestellter Rahmenkern

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486641A (en) 1981-12-21 1984-12-04 Ruffini Robert S Inductor, coating and method
JPS58142916A (ja) * 1982-02-18 1983-08-25 Inoue Japax Res Inc 摩擦材の製造方法
US4591472A (en) * 1982-03-17 1986-05-27 Keramik Holding Ag Laufen Process for the preparation of blanks
US4459253A (en) * 1982-08-30 1984-07-10 International Business Machines Corporation Manufacture of homogeneous magnetic recording structure
US4543208A (en) * 1982-12-27 1985-09-24 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic core and method of producing the same
US4603162A (en) * 1983-06-17 1986-07-29 Matsushita Electric Industrial Co., Ltd. Radiation curable resin, paint or ink vehicle composition comprising said resin and magnetic recording medium or resistor element using said resin
US5160447A (en) * 1988-02-29 1992-11-03 Kabushiki Kaisha Sankyo Seiki Seisakusho Compressed powder magnetic core and method for fabricating same
JPH03124249A (ja) * 1989-10-02 1991-05-27 Daikin Ind Ltd 回転電力機及びその製造方法
JPH04226003A (ja) * 1990-05-09 1992-08-14 Tdk Corp 複合軟磁性材料および複合軟磁性材料用コート粒子
JPH05109520A (ja) * 1991-08-19 1993-04-30 Tdk Corp 複合軟磁性材料
CA2080177C (fr) * 1992-01-02 1997-02-25 Edward Allan Highum Blindage electromagnetique; methode de fabrication
US5418811A (en) * 1992-04-08 1995-05-23 Fluxtrol Manufacturing, Inc. High performance induction melting coil
JPH09260126A (ja) * 1996-01-16 1997-10-03 Tdk Corp 圧粉コア用鉄粉末、圧粉コアおよびその製造方法
US6063303A (en) * 1996-08-21 2000-05-16 Tdk Corporation Magnetic powder and magnetic molded article
WO1998009788A1 (fr) * 1996-09-03 1998-03-12 Tokin Corporation Procede de fabrication d'une feuille magnetique composite
EP0986073B1 (fr) * 1998-03-27 2011-02-09 The Furukawa Electric Co., Ltd. Noyau de transformateur du type a separation
US6179894B1 (en) * 1999-11-29 2001-01-30 Delphi Technologies, Inc. Method of improving compressibility of a powder and articles formed thereby
DE19960095A1 (de) * 1999-12-14 2001-07-05 Bosch Gmbh Robert Gesinterter weichmagnetischer Verbundwerkstoff und Verfahren zu dessen Herstellung
DE102006020808B4 (de) * 2005-05-03 2010-10-07 Schleifring Und Apparatebau Gmbh Induktiver Drehübertrager mit Polymermaterial und Verfahren zur Herstellung eines solchen
US7724119B2 (en) * 2005-05-03 2010-05-25 Schleifring Und Apparatebau Gmbh Inductive rotary joint comprising polymer material
JP4693732B2 (ja) * 2005-10-11 2011-06-01 キヤノン電子株式会社 複合型金属成形体およびその製造方法
JP5214335B2 (ja) * 2008-05-30 2013-06-19 株式会社東芝 アンテナ装置
TWI407462B (zh) * 2009-05-15 2013-09-01 Cyntec Co Ltd 電感器及其製作方法
DE112018004572T8 (de) * 2017-10-17 2020-07-30 Denso Corporation Komprimierter pulver-magnetkern, pulver für magnetischen kern, und deren herstellungsverfahren

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US3126617A (en) * 1964-03-31 Method of producing permanent magnets
GB416583A (en) * 1933-03-13 1934-09-13 Victor George Van Colle An improved material for use in the magnetic circuit of inductance coils carrying high frequency currents
GB416094A (en) * 1933-03-13 1934-09-13 Standard Telephones Cables Ltd Improvements in or relating to automatic or semi-automatic telephone or like exchange systems
FR773288A (fr) * 1933-05-27 1934-11-15 Siemens Ag Méthode pour construire des bobines en limaille de fer
US2064773A (en) * 1933-06-01 1936-12-15 Ferrocart Corp Of America Method for making magnetic cores
US2064583A (en) * 1934-04-24 1936-12-15 Wolkoff John Dynamo-electric machine
DE972150C (de) * 1937-06-27 1959-05-27 Siemens Ag Verfahren zur Herstellung ferromagnetischer Formkoerper
US2508705A (en) * 1946-01-18 1950-05-23 Gen Aniline & Film Corp Pulverulent iron of improved electromagnetic properties
US2503947A (en) * 1947-03-10 1950-04-11 Comm Engineering Pty Ltd Method of molidng magnetic powder
US2971872A (en) * 1954-09-16 1961-02-14 Int Nickel Co Iron powder and the manufacture of magnetic cores therefrom
US2964793A (en) * 1957-11-13 1960-12-20 Leyman Corp Method of making permanent magnets
FR1292373A (fr) * 1961-03-23 1962-05-04 Partiot Cementation Atel Procédé d'obtention de matériaux magnétiques agglomérés notamment pour noyaux magnétiques pour inducteurs, et matériaux obtenus par ce procédé
GB998853A (en) * 1961-05-11 1965-07-21 Landis & Gyr Ag Mouldable composition for the production of permanent magnets
DE1533026A1 (de) * 1966-08-02 1969-11-20 Siemens Ag Verfahren zum Pressen von Presslingen mit homogener Pressgutsichte und einer in Pressrichtung unterschiedlichen Presshoehe
US3451934A (en) * 1968-02-09 1969-06-24 Motor Wheel Corp Process of making molded magnetic material
US4040971A (en) * 1972-01-21 1977-08-09 Westinghouse Electric Corporation Magnetic wedge
DE2241094A1 (de) * 1972-08-21 1974-03-07 Siemens Ag Spule
JPS51163498U (fr) * 1976-06-09 1976-12-27

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044592A1 (fr) * 1980-07-22 1982-01-27 Koninklijke Philips Electronics N.V. Composant électromagnétique à liant de résine synthétique et procédé pour sa fabrication
EP0220321A4 (fr) * 1985-04-19 1988-11-02 Kanegafuchi Chemical Ind Composition de materiau magnetique souple et son procede de moulage.
EP0354929A4 (fr) * 1987-10-30 1990-06-27 Ruffini & Assoc R S Compositions et procedes de production de pieces rapportees d'inducteurs.
WO1996019308A1 (fr) * 1994-12-19 1996-06-27 Aga Aktiebolag Procede, y compris le chauffage et le refroidissement, pour la production de pieces moulees par injection
US5989492A (en) * 1994-12-19 1999-11-23 Aga Aktiebolag Process including heating and cooling for production of an injection-moulded body
FR2740259A1 (fr) * 1995-10-24 1997-04-25 Thomson Csf Noyau magnetique mixte
EP0771011A1 (fr) * 1995-10-24 1997-05-02 Thomson-Csf Noyau magnétique mixte
US5748013A (en) * 1995-10-24 1998-05-05 Thomson-Csf Combined magnetic core
DE102014211116A1 (de) * 2014-06-11 2015-12-17 SUMIDA Components & Modules GmbH Verfahren zum Bilden eines Rahmenkerns mit Mittelschenkel für ein induktives Bauelement und entsprechend hergestellter Rahmenkern
US10170240B2 (en) 2014-06-11 2019-01-01 SUMIDA Components & Modules GmbH Method for forming a frame core having a center leg for an inductive component and frame core produced accordingly

Also Published As

Publication number Publication date
EP0004272B1 (fr) 1983-10-05
EP0004272A3 (en) 1979-10-31
US4320080A (en) 1982-03-16
DE2966239D1 (en) 1983-11-10
DE2812445C2 (de) 1983-10-13
DE2812445A1 (de) 1979-10-04

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