EP0004272A2 - Verfahren zur Herstellung von Pressmassen mit weichmagnetischen Eigenschaften - Google Patents
Verfahren zur Herstellung von Pressmassen mit weichmagnetischen Eigenschaften Download PDFInfo
- 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
Links
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)
Abstract
Description
- Die Erfindung geht aus von einem Verfahren nach der Gattung des Hauptanspruches. Es sind bereits weichmagnetische kunststoffgebundene Massekerne bekannt, die 95 bis 99,5 Gew.-% Carbonyleisen, Rest organischen Binder enthalten. Abgesehen von dem verhältnismäßig hohen Preis für Carbonyleisen, die derartige Magnete teuer machen, ist auch die Preßmasse infolge des sehr hohen Füllstoffanteils nicht fließfähig und läßt sich daher nicht so einfach und gleichmäßig in komplizierte Formen füllen. Sie muß auch mit Drücken von 5000 bis 18000 bar verdichtet werden. Darüber hinaus ist die mechanische Festigkeit der aus diesen Preßmassen hergestellten Bauteile gering und die Bauteile sind sehr spröde. Schließlich lassen sich die magnetischen Eigenschaften dieser Massekerne nicht in dem gewünschten Umfange an die gegebenen Erfordernisse anpassen.
- Es sind weiterhin Kerne aus weichmagnetischem Sinterferrit bekannt. Diese haben jedoch eine geringere magnetische Sättigungspolarisation, eine geringere mechanische Festigkeit und eine höhere Temperaturabhängigkeit der magnetischen Kennwerte. Die Möglichkeiten der Formgebung sind eingeschränkt, sie können nur mit größeren Maßtoleranzen hergestellt werden und lassen sich nur verhältnismäßig schwierig bearbeiten.
- Schließlich werden derartige Kerne auch aus Transformator-oder Dynamoblech hergestellt. Wegen Wirbelstromverlusten lassen sich diese jedoch nur bis ca. 1 kHz einsetzen. Darüber hinaus sind derartige Kerne auf bestimmte Bauformen begrenzt und erfordern Paketieren, das u.U. kostenaufwendig ist. Dünne Ni-Fe-Legierungsbleche mit einer Blechdicke bis 0,03 mm, die auch für Frequenzen bis 100 kHz einsetzbar sind und auch höhere Permeabilitäten aufweisen, sind teuer und schwer verarbeitbar.
- Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruches hat demgegenüber den Vorteil, daß sich mit ihm Magnete preisgünstig herstellen lasseri, die in gescherten Magnetkreisen mit Wechselmagnetisierung bis zu Frequenzen von 100 kHz eingesetzt werden können. Aufgrund der Fließfähigkeit der Preßmasse ist es mittels der in der Kunststofftechnik üblichen Verfahren ohne weiteres möglich, kompliziert geformte Bauteile aus der Preßmasse maßgenau herzustellen. Der anzuwendende Preßdruck liegt mit 200 bis 2000 bar gegenüber den obenerwähnten kunststoffgebundenen Massekernen verhältnismäßig niedrig. Durch Variation der Ausgangskomponenten,des Füllstoffes und des Preßdrucks lassen sich die magnetischen Eigenschaften in weitem Umfange an die gegebenen Erfordernisse anpassen. Gegenüber weichmagnetischen Sinterferriten weisen die erfindungsgemäßen Kerne eine höhere magnetische Sättigungspolarisation, bessere mechanische Festigkeitseigenschaften sowie eine geringere Temperaturabhängigkeit der magnetischen Kennwerte auf. Die Möglichkeiten der Formgebung sind weiter gesteckt, die Kerne können mit engeren Maßtolerenzan hergestellt werden und lassen sich, wenn nötig, leichter bearbeiten. Darüber hinaus sind die nach dem erfindungsgemäßen Verfahren hergestellten Massekerne bei Kreisen mit Gleichstromvormagnetisierung wegen ihrer höheren Sättigungspolarisation vorteilhafter zu verwenden als die weichmagnetischen Sinterferrite. Gegenüber Kernen aus konventionellem Transformator- oder Dynamoblechen ist vor allem der hohe Frequenzbereich, in dem die nach dem erfindungsgemäßen Verfahren hergestellten Massekerne verwendbar sind, sowie die Möglichkeit, Kerne mit komplizierten Bauformen herzustellen, zu erwähnen.
- Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahrens möglich. So ist es, um Wirbelstromverluste - insbesondere bei großen Teilequerschnitten - bei höheren Frequenzen zu vermindern, besonders vorteilhaft, das Carbonyleisen ganz oder teilweise durch Weichferritpulver zu. ersetzen.
- Ein Gemisch aus einem Eisenpulver, das durch Verdüsung, als Schwamm - oder Elektrolyteisenpulver gewonnen wurde, und 30 Gew.-% Carbonyleisenpulver mit einer mittleren Korngröße von vorzugsweise 90 jum werden mit etwa 50 Vol.-% eines flüssigen Polyesterharzes gemischt, in eine auf ca. 100 °C aufgeheizte Preßfbrm gebracht und mit einem Druck von 1000 bar ca. 40 Sekunden lang gepreßt. Dabei wird das überschüssige Polyesterharz durch die Spalte der Preßform ausgepreßt, wobei die Spalte eine Weite aufweisen, die kleiner ist als die mittlere Korngröße des Magnetpulvers, jedoch so groß, daß währ end der Druck-Aufbauzeit von 1 bis 30 Sekunden durch diese Spalte das überschüssige Bindeharz austreten kann. Dieses Auspressen ist wesentlich, da sonst nicht die hohen Füllgrade bei gleichzeitiger Erzielung einer ausreichenden Fließfähigkeit der Preßmasse zu Beginn des Preßvorgangs erreicht werden. Nach dem Abkühlen kann der ausgehärtete Magnetkörper der Form entnommen werden.
- In der gleichen Weise wird ein Magnetkörper aus einem Gemisch von dem obengenannten Eisenpulver mit 10 Gew.-% Carbonyleisenpulver in ca. 50 Vol.-% Phenolharz hergestellt bei einem Preßdruck von 2000 bar. Die Temperatur der Preßform beträgt in diesem Falle 140 °C.
- Dieses Beispiel zeigt, daß es auch möglich ist, ganz ohne Carbonyleisenpulver auszukommen. Für dieses Beispiel wurde gesiebtes Eisenpulver der obenbezeichneten Art in 50 Vol.-% Polyester verwendet. Der Preßdruck betrug 500 bar, die Temperatur der Preßform entsprach der des Beispiels 1.
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Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2812445 | 1978-03-22 | ||
DE2812445A DE2812445C2 (de) | 1978-03-22 | 1978-03-22 | Verfahren zur Herstellung von Preßmassen mit weichmagnetischen Eigenschaften |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0004272A2 true EP0004272A2 (de) | 1979-10-03 |
EP0004272A3 EP0004272A3 (en) | 1979-10-31 |
EP0004272B1 EP0004272B1 (de) | 1983-10-05 |
Family
ID=6035124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79100156A Expired EP0004272B1 (de) | 1978-03-22 | 1979-01-19 | Verfahren zur Herstellung von Pressmassen mit weichmagnetischen Eigenschaften |
Country Status (3)
Country | Link |
---|---|
US (1) | US4320080A (de) |
EP (1) | EP0004272B1 (de) |
DE (2) | DE2812445C2 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0044592A1 (de) * | 1980-07-22 | 1982-01-27 | Koninklijke Philips Electronics N.V. | Mit Kunstharz gebundenes, elektromagnetisches Bauelement und Verfahren zu seiner Herstellung |
EP0220321A1 (de) * | 1985-04-19 | 1987-05-06 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Zusammensetzung weicher magnetmaterialien und verfahren zum giessen derselben |
EP0354929A1 (de) * | 1987-10-30 | 1990-02-21 | R.S. RUFFINI & ASSOCIATES | Induktor-einsetzzusammensetzungen und verfahren zur herstellung derselben |
WO1996019308A1 (en) * | 1994-12-19 | 1996-06-27 | 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 |
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)
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 (en) * | 1992-01-02 | 1997-02-25 | Edward Allan Highum | Electro-magnetic shield and method for making the same |
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 |
WO1998008233A1 (fr) * | 1996-08-21 | 1998-02-26 | Tdk Corporation | Poudre magnetique et article magnetique moule |
KR20000064304A (ko) * | 1996-09-03 | 2000-11-06 | 도낀 가부시끼가이샤 | 복합자성 시트의 제조방법 |
JP4278719B2 (ja) * | 1998-03-27 | 2009-06-17 | 古河電気工業株式会社 | 分離型トランス |
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 |
US7724119B2 (en) * | 2005-05-03 | 2010-05-25 | Schleifring Und Apparatebau Gmbh | Inductive rotary joint comprising polymer material |
DE102006020808B4 (de) * | 2005-05-03 | 2010-10-07 | Schleifring Und Apparatebau Gmbh | Induktiver Drehübertrager mit Polymermaterial und Verfahren zur Herstellung eines solchen |
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 |
WO2019078257A1 (ja) * | 2017-10-17 | 2019-04-25 | 株式会社豊田中央研究所 | 圧粉磁心、磁心用粉末およびそれらの製造方法 |
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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 |
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US2971872A (en) * | 1954-09-16 | 1961-02-14 | Int Nickel Co | Iron powder and the manufacture of magnetic cores therefrom |
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 |
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US4116906A (en) * | 1976-06-09 | 1978-09-26 | Tdk Electronics Co., Ltd. | Coatings for preventing reflection of electromagnetic wave and coating material for forming said coatings |
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US3126617A (en) * | 1964-03-31 | Method of producing permanent magnets | ||
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 |
US2964793A (en) * | 1957-11-13 | 1960-12-20 | Leyman Corp | Method of making permanent magnets |
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 |
-
1978
- 1978-03-22 DE DE2812445A patent/DE2812445C2/de not_active Expired
-
1979
- 1979-01-19 EP EP79100156A patent/EP0004272B1/de not_active Expired
- 1979-01-19 DE DE7979100156T patent/DE2966239D1/de not_active Expired
-
1980
- 1980-10-03 US US06/193,467 patent/US4320080A/en not_active Expired - Lifetime
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US2971872A (en) * | 1954-09-16 | 1961-02-14 | Int Nickel Co | Iron powder and the manufacture of magnetic cores therefrom |
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 |
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 |
US4116906A (en) * | 1976-06-09 | 1978-09-26 | Tdk Electronics Co., Ltd. | Coatings for preventing reflection of electromagnetic wave and coating material for forming said coatings |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0044592A1 (de) * | 1980-07-22 | 1982-01-27 | Koninklijke Philips Electronics N.V. | Mit Kunstharz gebundenes, elektromagnetisches Bauelement und Verfahren zu seiner Herstellung |
EP0220321A1 (de) * | 1985-04-19 | 1987-05-06 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Zusammensetzung weicher magnetmaterialien und verfahren zum giessen derselben |
EP0220321A4 (de) * | 1985-04-19 | 1988-11-02 | Kanegafuchi Chemical Ind | Zusammensetzung weicher magnetmaterialien und verfahren zum giessen derselben. |
EP0354929A1 (de) * | 1987-10-30 | 1990-02-21 | R.S. RUFFINI & ASSOCIATES | Induktor-einsetzzusammensetzungen und verfahren zur herstellung derselben |
EP0354929A4 (de) * | 1987-10-30 | 1990-06-27 | Ruffini & Assoc R S | Induktor-einsetzzusammensetzungen und verfahren zur herstellung derselben. |
WO1996019308A1 (en) * | 1994-12-19 | 1996-06-27 | Aga Aktiebolag | Process including heating and cooling for production of an injection-moulded body |
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 (de) * | 1995-10-24 | 1997-05-02 | Thomson-Csf | Gemischter Magnetkern |
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 |
---|---|
US4320080A (en) | 1982-03-16 |
EP0004272B1 (de) | 1983-10-05 |
DE2966239D1 (en) | 1983-11-10 |
DE2812445A1 (de) | 1979-10-04 |
DE2812445C2 (de) | 1983-10-13 |
EP0004272A3 (en) | 1979-10-31 |
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