EP0794538A1 - Toroidal core for inductance, in particular for radio interference suppression of phase-controllable semiconductor circuits - Google Patents

Toroidal core for inductance, in particular for radio interference suppression of phase-controllable semiconductor circuits Download PDF

Info

Publication number
EP0794538A1
EP0794538A1 EP97102148A EP97102148A EP0794538A1 EP 0794538 A1 EP0794538 A1 EP 0794538A1 EP 97102148 A EP97102148 A EP 97102148A EP 97102148 A EP97102148 A EP 97102148A EP 0794538 A1 EP0794538 A1 EP 0794538A1
Authority
EP
European Patent Office
Prior art keywords
trough
toroidal
cover
amorphous
toroidal core
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.)
Withdrawn
Application number
EP97102148A
Other languages
German (de)
French (fr)
Inventor
Hans-Joachim Pöss
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
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
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0794538A1 publication Critical patent/EP0794538A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it

Definitions

  • a toroidal choke that meets these requirements is described for example in DE 18 04 835 C3.
  • the first of these materials having a relatively low permeability with high saturation induction and the second material having a medium permeability.
  • amorphous powder or nanocrystalline powder has also been used. This is evident from EP 302 355 A1. Despite the significantly higher permeability of the amorphous material and in particular of the nanocrystalline material, a powder core will also have a lower permeability here compared to solid cores even from crystalline material because of the binder used.
  • the object of the present invention is to provide a core for such a ring core choke which is simple and inexpensive to produce and which can be produced in a very compact size, depending on the power, by utilizing the high permeability of amorphous or nanocrystalline alloys.
  • the invention thus relates to a toroidal core for a choke, in particular for radio interference suppression of semiconductor circuits using the phase gating method, which consists of two soft magnetic materials of different permeability and saturation induction.
  • one of the materials consists of a soft magnetic, crystalline material and that an annular core-shaped trough is formed from this material and that the other material consists of amorphous and / or nanocrystalline particles which as powder or flakes are inside the toroidal trough.
  • the trough made of crystalline soft magnetic material can be made from any soft magnetic alloy. However, pure iron is advantageously used. Shredded tapes made of amorphous or nanocrystalline material can be used as powder or flakes. But it is also possible that the resulting in the production of the tapes and for tapes z. B. because of brittleness, poor dimensional accuracy, etc. to use unusable material that would otherwise have to be melted down as scrap.
  • a cover which is also made of soft magnetic material or plastic, serves to close the trough, so that the nanocrystalline particles are enclosed on all sides and do not require any compaction. Nevertheless, it is possible to improve the filling factor by pressing in the particles or to achieve additional noise insulation by adding a binder to the trough.
  • FIG. 1 An exemplary embodiment is shown in cross section in FIG. 1 and in plan view in FIG. 2.
  • Amorphous and / or nanocrystalline particles 3 are located in an annular core-shaped trough 1, which can be covered by a cover 2, which largely fill the interior of the trough 1.
  • the trough 1 with the particles 3 therein made of nanocrystalline or amorphous material can be provided with insulation in the usual way and serve as a ring core for a throttle.
  • the structure according to the invention is particularly advantageous for radio interference suppression chokes, since the high permeability of the particles of amorphous or nanocrystalline material with small dimensions ensure high inductance and since the eddy currents which form in the trough 1 contribute to damping the current. For this reason, the core is especially for chokes suitable, which are used for radio interference suppression of semiconductor circuits, which work according to the phase control method and cause harmonics in the operating current.
  • FIG. 2 shows a plan view of the ring core shown in cross section in FIG. 1, with the trough 1 without a lid and the particles 3 located inside the trough.
  • the trough 1 can consist entirely or only partially of soft magnetic material, depending on what level of eddy currents is desired for the respective application.
  • the eddy currents that are formed can also be adapted to the respective requirements by selecting the wall thickness of the trough.

Abstract

The ring core is made up of two weakly magnetic materials of different permeability and saturation induction. One of the materials is a weakly magnetic, crystalline material. A ring core shaped vat (1) is formed of this first material. The other material is made up of amorphous and/or nano crystalline particles (3) which are provided as powder or flakes in the inside of the ring core shaped vat (1). The vat may be closed by a disk shaped cover (2). The vat and/or the cover may be made of pure iron. The cover (2) which closes the vat (1) may be made of plastic. Preferably the amorphous or crystalline particles are held together by a binding means.

Description

Zur Begrenzung leitungsgebundener hochfrequenter Störenergien werden Funkentstördrosseln im allgemeinen als Längsglieder dort eingesetzt, wo Kondensatoren allein keinen ausreichenden störungsarmen Funkempfang sicherstellen. Derartige Drosseln sind insbesondere erforderlich zur Entstörung von Halbleiter-Schaltungen, welche in Bezug auf Funkstörungen einen kleinen Innenwiderstand aufweisen. Beispielsweise werden sie benötigt in mit Thyristoren arbeitenden Helligkeitsreglern. Solche Drosseln sollen

  • die notwendige Entstörung bei möglichst geringem Aufwand an Siebmitteln bewirken,
  • die eigentliche Funktion der Schaltung nicht nachteilig beeinflussen, also z. B. nach Ablauf des Schaltvorgangs für den Laststrom keinen nennenswerten ohmschen und induktiven Widerstand mehr darstellen,
  • den Halbleiter gegen zu hohe Spannungsspitzen und zu steilen Anstieg des Einschaltstromes schützen
  • sowie kleine Abmessungen haben und streuarm sein.
In order to limit conducted high-frequency interference energies, radio interference suppression chokes are generally used as series links where capacitors alone do not ensure adequate, low-interference radio reception. Such chokes are particularly necessary for interference suppression of semiconductor circuits which have a low internal resistance with respect to radio interference. For example, they are required in brightness controllers working with thyristors. Such chokes are said to
  • cause the necessary interference suppression with the least possible expenditure on sieving media,
  • do not adversely affect the actual function of the circuit, e.g. B. after the switching process for the load current no longer represent any significant ohmic and inductive resistance,
  • protect the semiconductor against too high voltage peaks and too steep an increase in the inrush current
  • as well as small dimensions and have little scatter.

Eine Ringkerndrossel, die diese Forderungen erfüllt, ist beispielsweise in DE 18 04 835 C3 beschrieben. Hier wird vorgeschlagen, für den Ringkern der Funkentstördrossel zwei unterschiedliche, weichmagnetische metallische Werkstoffe zu verwenden, wobei der erste dieser Werkstoffe eine relativ niedrige Permeabilität bei gleichzeitig hoher Sättigungsinduktion und der zweite Werkstoff eine mittlere Permeabilität aufweist.A toroidal choke that meets these requirements is described for example in DE 18 04 835 C3. Here it is proposed to use two different, soft magnetic metallic materials for the toroid of the radio interference suppression choke, the first of these materials having a relatively low permeability with high saturation induction and the second material having a medium permeability.

Weiterhin ist es aus DE 23 43 377 B2 bekannt, für den Kern einer Funkentstördrossel neben Blechringen einen Pulverkern zu verwenden, der aus mit Kunststoff verpreßtem Eisenpulver besteht. Hierbei dient der aus mit Kunststoff verpreßtem Eisenpulver bestehende Teil des zusammengesetzten Drosselkerns als Werkstoff mit geringerer Permeabilität, da der Kunststoffbinder zwischen den Eisenteilchen magnetisch wie einzelne Luftspalte wirkt.Furthermore, it is known from DE 23 43 377 B2 to use a powder core for the core of a radio interference suppressor in addition to sheet metal rings, which core consists of iron powder pressed with plastic. Here, the part of the assembled throttle core made of plastic pressed iron powder serves as a material with lower permeability, since the plastic binder between the iron particles acts magnetically like individual air gaps.

Für magnetische Kerne, die aus gepreßtem weichmagnetischem Pulver bestehen, hat man auch schon amorphes Pulver oder auch nanokristallines Pulver verwendet. Dies geht aus EP 302 355 A1 hervor. Trotz der wesentlich höheren Permeabilität des amorphen Materials und insbesondere des nanokristallinen Materials wird aber auch hier ein Pulverkern wegen des verwendeten Binders gegenüber Massivkernen selbst aus kristallinem Material eine niedrigere Permeabilität aufweisen.For magnetic cores, which consist of compressed soft magnetic powder, amorphous powder or nanocrystalline powder has also been used. This is evident from EP 302 355 A1. Despite the significantly higher permeability of the amorphous material and in particular of the nanocrystalline material, a powder core will also have a lower permeability here compared to solid cores even from crystalline material because of the binder used.

Aufgabe der vorliegenden Erfindung ist es, einen Kern für eine derartige Ringkerndrossel anzugeben, der einfach und preiswert herstellbar ist und durch Ausnutzung der hohen Permeabilität von amorphen oder nanokristallinen Legierungen in sehr kompakten Maßen - abhängig von der Leistung - der Drossel herstellbar ist.The object of the present invention is to provide a core for such a ring core choke which is simple and inexpensive to produce and which can be produced in a very compact size, depending on the power, by utilizing the high permeability of amorphous or nanocrystalline alloys.

Die Erfindung betrifft damit einen Ringkern für eine Drossel, insbesondere zur Funkentstörung von Halbleiterschaltungen nach dem Phasenanschnittsverfahren, der aus zwei weichmagnetischen Materialien unterschiedlicher Permeabilität und Sättigungsinduktion besteht.The invention thus relates to a toroidal core for a choke, in particular for radio interference suppression of semiconductor circuits using the phase gating method, which consists of two soft magnetic materials of different permeability and saturation induction.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß eines der Materialien aus einem weichmagnetischen, kristallinen Material besteht und daß aus diesem Material ein ringkernförmiger Trog ausgebildet ist, und daß das andere Material aus amorphen und/oder nanokristallinen Teilchen besteht, die als Pulver oder Flakes sich im Inneren des ringkernförmigen Troges befinden.This object is achieved in that one of the materials consists of a soft magnetic, crystalline material and that an annular core-shaped trough is formed from this material and that the other material consists of amorphous and / or nanocrystalline particles which as powder or flakes are inside the toroidal trough.

Der aus kristallinem weichmagnetischem Material bestehende Trog kann aus jeder beliebigen weichmagnetischen Legierung hergestellt werden. Vorteilhafterweise verwendet man jedoch reines Eisen. Als Pulver oder Flakes kann man zerkleinerte Bänder aus amorphem oder nanokristallinem Material verwenden. Es ist aber außerdem möglich, das bei der Herstellung der Bänder anfallende und für Bänder z. B. wegen Sprödigkeit, schlechter Maßhaltigkeit usw., nicht brauchbare Material zu verwenden, das sonst als Schrott hätte wieder eingeschmolzen werden müssen. Ein ebenfalls aus weichmagnetischem Material oder Kunststoff bestehender Deckel dient dabei zum Verschließen des Troges, so daß die nanokristallinen Teilchen allseitig eingeschlossen sind und keiner Kompaktierung bedürfen. Trotzdem ist es möglich, den Füllfaktor durch Einpressen der Teilchen zu verbessern oder eine zusätzliche Geräuschdämmung durch Zugabe eines Binders in den Trog zu erzielen.The trough made of crystalline soft magnetic material can be made from any soft magnetic alloy. However, pure iron is advantageously used. Shredded tapes made of amorphous or nanocrystalline material can be used as powder or flakes. But it is also possible that the resulting in the production of the tapes and for tapes z. B. because of brittleness, poor dimensional accuracy, etc. to use unusable material that would otherwise have to be melted down as scrap. A cover, which is also made of soft magnetic material or plastic, serves to close the trough, so that the nanocrystalline particles are enclosed on all sides and do not require any compaction. Nevertheless, it is possible to improve the filling factor by pressing in the particles or to achieve additional noise insulation by adding a binder to the trough.

Ein Ausführungsbeispiel ist in Fig. 1 im Querschnitt und in Fig. 2 in Draufsicht dargestellt.An exemplary embodiment is shown in cross section in FIG. 1 and in plan view in FIG. 2.

In einem ringkernförmigen Trog 1, der durch einen Deckel 2 abgedeckt sein kann, befinden sich amorphe und/oder nanokristalline Teilchen 3, die den Innenraum des Troges 1 weitgehend ausfüllen. Der Trog 1 mit den darin befindlichen Teilchen 3 aus nanokristallinem oder amorphem Material kann dabei in üblicher Weise mit einer Isolation versehen werden und als Ringkern für eine Drossel dienen. Insbesondere für Funkentstördrosseln ist der erfindungsgemäße Aufbau von Vorteil, da die hohe Permeabilität der Teilchen aus amorphem oder nanokristallinem Material bei kleinen Abmessungen eine hohe Induktivität gewährleisten und da die im Trog 1 sich ausbildenden Wirbelströme zur Dämpfung des Stromes beitragen. Aus diesem Grund ist der Kern besonders für Drosseln geeignet, die zur Funkentstörung von Halbleiterschaltungen eingesetzt werden, die nach dem Phasenanschnittverfahren arbeiten und Oberwellen im Betriebsstrom hervorrufen.Amorphous and / or nanocrystalline particles 3 are located in an annular core-shaped trough 1, which can be covered by a cover 2, which largely fill the interior of the trough 1. The trough 1 with the particles 3 therein made of nanocrystalline or amorphous material can be provided with insulation in the usual way and serve as a ring core for a throttle. The structure according to the invention is particularly advantageous for radio interference suppression chokes, since the high permeability of the particles of amorphous or nanocrystalline material with small dimensions ensure high inductance and since the eddy currents which form in the trough 1 contribute to damping the current. For this reason, the core is especially for chokes suitable, which are used for radio interference suppression of semiconductor circuits, which work according to the phase control method and cause harmonics in the operating current.

Fig. 2 zeigt eine Aufsicht auf den in Fig. 1 im Querschnitt dargestellten Ringkern, mit dem Trog 1 ohne Deckel und den im Innern des Troges befindlichen Teilchen 3. Der Trog 1 kann dabei ganz oder nur teilweise aus weichmagnetischem Material bestehen, abhängig davon, welches Maß an Wirbelströmen für den jeweiligen Einsatzzweck gewünscht wird. Die sich ausbildenden Wirbelströme lassen sich auch durch Wahl der Wandstärke des Troges den jeweiligen Erfordernissen anpassen.FIG. 2 shows a plan view of the ring core shown in cross section in FIG. 1, with the trough 1 without a lid and the particles 3 located inside the trough. The trough 1 can consist entirely or only partially of soft magnetic material, depending on what level of eddy currents is desired for the respective application. The eddy currents that are formed can also be adapted to the respective requirements by selecting the wall thickness of the trough.

Claims (5)

Ringkern für eine Drossel, insbesondere zur Funkentstörung von Halbleiterschaltungen nach dem Phasenanschnittsverfahren, der aus zwei weichmagnetischen Materialien unterschiedlicher Permeabilität und Sättigungsinduktion besteht, dadurch gekennzeichnet , daß eines der Materialien aus einem weichmagnetischen, kristallinen Material besteht und daß aus diesem Material ein ringkernförmiger Trog (1) ausgebildet ist, und daß das andere Material aus amorphen und/oder nanokristallinen Teilchen (3) besteht, die als Pulver oder Flakes sich im Inneren des ringkernförmigen Troges (1) befinden.Toroidal core for a choke, in particular for radio interference suppression of semiconductor circuits according to the phase control method, which consists of two soft magnetic materials of different permeability and saturation induction, characterized in that one of the materials consists of a soft magnetic, crystalline material and that a toroidal trough made of this material (1) is formed, and that the other material consists of amorphous and / or nanocrystalline particles (3) which are in the form of powder or flakes in the interior of the toroidal trough (1). Ringkern nach Anspruch 1, dadurch gekennzeichnet , daß der ringkernförmige Trog von einem als ringkernförmige Scheibe ausgebildeten Deckel (2) verschlossen ist.Ring core according to claim 1, characterized in that the ring-shaped trough is closed by a cover (2) designed as a ring-shaped disc. Ringkern noch Anspruch 1 oder 2, dadurch gekennzeichnet , daß der ringkernförmige Trog (1) und/oder der Deckel (2) aus reinem Eisen bestehen.Toroidal core still claim 1 or 2, characterized in that the toroidal trough (1) and / or the cover (2) consist of pure iron. Ringkern nach Anspruch 3, dadurch gekennzeichnet , daß der den ringkernförmigen Trog (1) verschließende Deckel (2) aus Kunststoff besteht.Toroidal core according to claim 3, characterized in that the cover (2) closing the toroidal trough (1) consists of plastic. Ringkern nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , daß die amorphen oder nanokristallinen Teilchen (3) in dem Trog von einem Bindemittel zusammengehalten werden.Toroidal core according to one of the preceding claims, characterized in that the amorphous or nanocrystalline particles (3) are held together in the trough by a binder.
EP97102148A 1996-03-07 1997-02-11 Toroidal core for inductance, in particular for radio interference suppression of phase-controllable semiconductor circuits Withdrawn EP0794538A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19608890 1996-03-07
DE19608890 1996-03-07

Publications (1)

Publication Number Publication Date
EP0794538A1 true EP0794538A1 (en) 1997-09-10

Family

ID=7787546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102148A Withdrawn EP0794538A1 (en) 1996-03-07 1997-02-11 Toroidal core for inductance, in particular for radio interference suppression of phase-controllable semiconductor circuits

Country Status (3)

Country Link
US (1) US5751207A (en)
EP (1) EP0794538A1 (en)
JP (1) JPH09246049A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091141A1 (en) * 2000-05-19 2001-11-29 Vacuumschmelze Gmbh & Co. Kg Inductive component and method for the production thereof
DE102006032520A1 (en) * 2006-07-12 2008-01-17 Vacuumschmelze Gmbh & Co. Kg Manufacture of magnet core used in inductive component such as choke for power factor correction, involves pressing mixture of amorphous coarse grain particle fraction with nanocrystalline fine grain powder particle fraction
US8287664B2 (en) 2006-07-12 2012-10-16 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US8298352B2 (en) 2007-07-24 2012-10-30 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US8372218B2 (en) 2006-06-19 2013-02-12 Vacuumschmelze Gmbh & Co. Kg Magnet core and method for its production

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19848827A1 (en) * 1998-10-22 2000-05-04 Vacuumschmelze Gmbh Device for damping interference voltages
US7541909B2 (en) 2002-02-08 2009-06-02 Metglas, Inc. Filter circuit having an Fe-based core
TW200419600A (en) * 2002-12-06 2004-10-01 Toko Inc Complex magnetic material, and core and magnetic element using the complex magnetic material
CN100458988C (en) * 2004-12-15 2009-02-04 台达电子工业股份有限公司 Choke coil and its embedded iron core
US20070257759A1 (en) * 2005-11-04 2007-11-08 Delta Electronics, Inc. Noise filter and manufacturing method thereof
US8610533B2 (en) 2011-03-31 2013-12-17 Bose Corporation Power converter using soft composite magnetic structure
DE102015200666A1 (en) * 2015-01-16 2016-08-18 Vacuumschmelze Gmbh & Co. Kg Magnetic core, method for producing such a magnetic core and method for producing an electrical or electronic assembly with such a magnetic core
CN106158225B (en) * 2016-08-31 2018-09-11 广东美的制冷设备有限公司 High low pass Combined Filter magnetic core, electric elements and electrical equipment
JP6881379B2 (en) * 2018-03-30 2021-06-02 株式会社豊田自動織機 In-vehicle electric compressor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7726882U1 (en) * 1977-08-30 1977-12-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen COVERING FOR RING-SHAPED CORES OF REACTOR COILS
DE2735407A1 (en) * 1976-08-09 1978-02-16 Nippon Kinzoku Co Ltd THROTTLE COIL
DE2736963A1 (en) * 1977-08-17 1979-02-22 Hartmann Goetz Udo Radio interference suppression choke for semiconductor circuits - esp. for lighting dimmers, and using multilayer iron core
US4197146A (en) * 1978-10-24 1980-04-08 General Electric Company Molded amorphous metal electrical magnetic components
JPS6151808A (en) * 1984-08-20 1986-03-14 Fujitsu Ltd Structure of ringed compound magnetic core
DE4306128A1 (en) * 1993-02-27 1994-09-01 Vacuumschmelze Gmbh ISDN transformer having a composite magnetic core

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1809042A (en) * 1926-11-30 1931-06-09 Bell Telephone Labor Inc Magnet core
US2467101A (en) * 1941-03-08 1949-04-12 Western Electric Co Magnetic core
DE2058509C3 (en) * 1970-11-27 1975-07-03 Siemens Ag Radio interference suppression choke against impulse-like interference voltages
JPS5591810A (en) * 1978-12-29 1980-07-11 Mitsubishi Electric Corp Zero phase current transformer
US4789849A (en) * 1985-12-04 1988-12-06 General Electric Company Amorphous metal transformer core and coil assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2735407A1 (en) * 1976-08-09 1978-02-16 Nippon Kinzoku Co Ltd THROTTLE COIL
DE2736963A1 (en) * 1977-08-17 1979-02-22 Hartmann Goetz Udo Radio interference suppression choke for semiconductor circuits - esp. for lighting dimmers, and using multilayer iron core
DE7726882U1 (en) * 1977-08-30 1977-12-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen COVERING FOR RING-SHAPED CORES OF REACTOR COILS
US4197146A (en) * 1978-10-24 1980-04-08 General Electric Company Molded amorphous metal electrical magnetic components
JPS6151808A (en) * 1984-08-20 1986-03-14 Fujitsu Ltd Structure of ringed compound magnetic core
DE4306128A1 (en) * 1993-02-27 1994-09-01 Vacuumschmelze Gmbh ISDN transformer having a composite magnetic core

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 213 (E - 422) 25 July 1986 (1986-07-25) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091141A1 (en) * 2000-05-19 2001-11-29 Vacuumschmelze Gmbh & Co. Kg Inductive component and method for the production thereof
US7265651B2 (en) 2000-05-19 2007-09-04 Vacuumschmelze Gmbh & Co. Kg Inductive component and method for the production thereof
US8327524B2 (en) 2000-05-19 2012-12-11 Vacuumscmelze Gmbh & Co. Kg Inductive component and method for the production thereof
US8372218B2 (en) 2006-06-19 2013-02-12 Vacuumschmelze Gmbh & Co. Kg Magnet core and method for its production
DE102006032520A1 (en) * 2006-07-12 2008-01-17 Vacuumschmelze Gmbh & Co. Kg Manufacture of magnet core used in inductive component such as choke for power factor correction, involves pressing mixture of amorphous coarse grain particle fraction with nanocrystalline fine grain powder particle fraction
DE102006032520B4 (en) * 2006-07-12 2008-04-10 Vacuumschmelze Gmbh & Co. Kg Method for producing magnetic cores, magnetic core and inductive component with a magnetic core
US8287664B2 (en) 2006-07-12 2012-10-16 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US8298352B2 (en) 2007-07-24 2012-10-30 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core

Also Published As

Publication number Publication date
JPH09246049A (en) 1997-09-19
US5751207A (en) 1998-05-12

Similar Documents

Publication Publication Date Title
EP0794538A1 (en) Toroidal core for inductance, in particular for radio interference suppression of phase-controllable semiconductor circuits
EP2463869B2 (en) Inductive component with improved core properties
DE69911138T2 (en) Sintered R-T-B permanent magnet
DE60208523T2 (en) COIL COMPONENT AND METHOD FOR THE PRODUCTION THEREOF
DE102006032517B4 (en) Process for the preparation of powder composite cores and powder composite core
CH630665A5 (en) PERMANENT MAGNETIC ALLOY.
DE112011104619T5 (en) Arctic magnet with polar anisotropic orientation and method and form of formation for its manufacture
EP0794539B1 (en) Toroidal inductance for radio interference suppression of phase-controllable semiconductor circuits
DE2825235C2 (en) Choke coil with a ring-shaped iron core
DE2121514B2 (en) Process for the production of an intermetallic sintered material, in particular for permanent magnets
DE19849781A1 (en) Injection molded soft magnetic powder composite and process for its manufacture
DE4442420A1 (en) Soft magnetic iron-based alloy with cobalt for magnetic circuits or excitation circuits
DE2736963C3 (en) Radio interference suppression choke and process for their manufacture
DE19942939A1 (en) Soft magnetic film and process for its production
DE102006032520B4 (en) Method for producing magnetic cores, magnetic core and inductive component with a magnetic core
DE19945943B4 (en) Borarme Nd-Fe-B alloy and process for its preparation
DE2811227A1 (en) Iron powder core for loudspeaker filters - prepd. by pressing powder which pref. includes lubricant and colloidal and phenolic resin binders
DE2122977A1 (en) Sintered iron - silicon switching magnet - having superior mech strength - prepn
DE19636284C2 (en) SE-Fe-B permanent magnet and process for its manufacture
DE19901255A1 (en) Inductor, especially a choke, choke coil, transformer or relay, is produced by surrounding one or more coils with ferromagnetic material powder
DE2505080B2 (en) Radio interference suppression choke and process for their manufacture
DE2721967A1 (en) SPARK CONDUCTORS FOR PHASE-GATE CONTROLLED SEMI-CONDUCTOR CIRCUITS
DE19842791C2 (en) Use of a casting process to provide starting material for the production of hard magnetic materials
AT301714B (en) Toroidal core choke composed of two magnetic cores
DE2814570A1 (en) Permanent magnetic alloy - contains cobalt, iron, copper, hafnium and samarium and/or cerium

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19971006

17Q First examination report despatched

Effective date: 19990705

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19991116