EP0771011A1 - Gemischter Magnetkern - Google Patents

Gemischter Magnetkern Download PDF

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Publication number
EP0771011A1
EP0771011A1 EP96402193A EP96402193A EP0771011A1 EP 0771011 A1 EP0771011 A1 EP 0771011A1 EP 96402193 A EP96402193 A EP 96402193A EP 96402193 A EP96402193 A EP 96402193A EP 0771011 A1 EP0771011 A1 EP 0771011A1
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EP
European Patent Office
Prior art keywords
core
magnetic
air gap
ferrite
permeability
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
EP96402193A
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English (en)
French (fr)
Other versions
EP0771011B1 (de
Inventor
François Thomson-CSF SCPI Beauclair
Jean-Pierre Thomson-CSF SCPI Delvinquier
Richard Thomson-CSF SCPI Lebourgeois
Michel Thomson-CSF SCPI Pate
Claude Thomson-CSF SCPI Rohart
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.)
Thales SA
Original Assignee
Thomson CSF SA
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Publication date
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Publication of EP0771011B1 publication Critical patent/EP0771011B1/de
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    • 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
    • H01F3/14—Constrictions; Gaps, e.g. air-gaps
    • 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

Definitions

  • the present invention relates to a mixed magnetic core, in particular for inductors or transformers.
  • the inductors thus produced may serve as filtering inductors or be used in power converters working at frequencies close to or greater than about 0.1 MHz.
  • An inductance of a few micro-Henrys will include a few turns or a low-permeability core.
  • a small number of turns having a high potential difference at its terminals generates a high magnetic induction in the core.
  • the losses in the nucleus are at least proportional to the square of the induction, they increase very quickly when the number of turns decreases.
  • a large number of turns is required, which imposes a core with low permeability.
  • inductors with a composite magnetic core with distributed air gap. These materials consist of ferromagnetic powder alloys dispersed in a dielectric binder. The radiation losses are reduced compared to the nuclei with localized air gap.
  • powders iron and iron-cabonyl powders whose permeability ranges from approximately 5 to 250 and powders based on iron-nickel alloys whose permeability ranges from approximately 14 to 550.
  • the losses in these materials are 15 to 20 times greater than those of massive power ferrites under the same frequency, induction and temperature conditions.
  • the present invention provides a magnetic core having high induction losses of the order of those of polycrystalline magnetic ceramics and a permeability reduced by a factor of about 100 compared to that of these permeability materials generally between 700 and 3000.
  • the present invention relates to a magnetic core comprising a polycrystalline magnetic ceramic body with at least one air gap located.
  • the localized air gap is made of a composite magnetic material.
  • the composite magnetic material can be made from ferromagnetic alloys such as iron-carbonyl or iron-nickel powders embedded in a dielectric binder or based on polycrystalline magnetic ceramic plates embedded in a dielectric binder and oriented with their faces. main substantially parallel to the magnetic field.
  • ferromagnetic alloys such as iron-carbonyl or iron-nickel powders embedded in a dielectric binder or based on polycrystalline magnetic ceramic plates embedded in a dielectric binder and oriented with their faces. main substantially parallel to the magnetic field.
  • the dielectric binder can be an epoxy, phenolic, polyimide or acrylic-based resin.
  • the localized air gap can be made integral with the body by gluing or else inserted directly by molding.
  • Such a core can work at higher inductions than the available materials for the same level of losses and the same permeability.
  • Such a core has a volume lower than those available for the same level of losses and the same permeability.
  • the present invention also relates to an inductor and a transformer which include such a core.
  • FIG. 1 schematically shows an O-ring according to the invention.
  • This core comprises a body 1 of polycrystalline magnetic ceramic with at least one localized air gap 2.
  • the air gap 2 is made of a composite magnetic material.
  • the body 1 can be a power ferrite of the PC50 type from TDK, of the F4 type from the LCC, of the 3F4 type from the Philips. Its permeability is worth approximately 1000 to 1 MH z.
  • the air gap 2 can be a composite based on powdered ferromagnetic alloys, such as iron-carbonyl or iron-nickel powders, dispersed in a dielectric binder.
  • powdered ferromagnetic alloys such as iron-carbonyl or iron-nickel powders
  • the grains will preferably be chemically passivated to avoid their oxidation.
  • the binder can be an epoxy, phenolic, polyimide or acrylic-based resin.
  • the air gap can be a composite of the A08 type from Saphyr, of the T26 type from Micrometal, from the 55,000 or 58,000 series from Magnetics. Its permeability is of the order of 10 to 1 MHz.
  • the width e of the air gap 2 is about a quarter of the perimeter of the core.
  • the width of the gap was very small compared to that of the body to avoid radiation leaks which are disruptive for the components placed near the core.
  • the air gap 2 of composite material channels the flow and the radiation leaks are practically eliminated.
  • the permeability ⁇ a is therefore worth approximately 34 which is perfectly acceptable for an application in converters with a high level of integration.
  • FIG. 2 gives the variation of the apparent permeability of a ferrite / iron-carbonyl toric core according to the invention as a function of ⁇ .
  • the total losses measured under the same conditions for the solid iron-carbonyl composite material amount to 2.5 W / cm 3 .
  • the gain is more than 10.
  • the fact of introducing a localized air gap 2 made of composite magnetic material having high losses has practically not degraded the losses of the core compared to those of the body of ferrite of spinel type.
  • the air gap 2 can also be made of a composite magnetic material such as that described in the French patent application filed on September 19, 1995 under No. 95 10952 by the applicant.
  • This composite magnetic material comprises polycrystalline magnetic ceramic plates embedded in a dielectric binder.
  • the plates are oriented so that their main faces are substantially parallel to the magnetic field to which the core is intended to be subjected.
  • the binder is resin, for example of the epoxy, phenolic, polyimide or acrylic-based type.
  • the plates are stacked in strata and embedded in the binder. There may be one or more plates per strata. From one stratum to another the plates can be arranged in columns or staggered.
  • the air gap 2 can be made integral with the body 1 by gluing, for example. It can also be molded directly in its place.
  • FIG. 4 shows an example of inductance produced from an O-ring core with a ferrite body 30 and four localized air gaps 31 arranged regularly in the body 30. These air gaps 31 are produced with plates 33 embedded in a dielectric binder 34 as previously described.
  • This inductance also includes a coil 32 preferably located on the body 30 so as to minimize the interaction of the coil 32 with the air gaps 31 made of composite magnetic material having a lower permeability than that of the body 30.
  • the conductors used for the coil 32 preferably will be multi-strand enameled or Litz wires so as to reduce copper losses at frequencies above about 50 kHz. These inductors can be used as a filter inductor or as an inductor for resonant converters.
  • an inductor To produce an inductor according to the invention, one begins by choosing the material of the core body as a function of the frequency at which the inductor must operate and the apparent permeability which it must have. Then from the permeability that this material has, the dimensions of the air gap (s) and their load of magnetic material are calculated to obtain the desired apparent permeability.
  • Figure 5 shows a transformer according to the invention. It comprises a core 50 in E with rectangular legs including a central 52 and two ends 51.
  • This core 50 comprises a body 53 made of ferrite and at each leg 51, 52 a localized air gap 54 made of composite magnetic material.
  • Two windings 55, 56 around the extreme legs 51 contribute to forming the primary and the secondary of the transformer. These windings do not surround the air gaps 54.
  • the air gaps all had the same shape. It is understood that they can have different shapes, different compositions and different magnetic material charges.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Magnetic Ceramics (AREA)
EP96402193A 1995-10-24 1996-10-15 Gemischter Magnetkern Expired - Lifetime EP0771011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9512493 1995-10-24
FR9512493A FR2740259B1 (fr) 1995-10-24 1995-10-24 Noyau magnetique mixte

Publications (2)

Publication Number Publication Date
EP0771011A1 true EP0771011A1 (de) 1997-05-02
EP0771011B1 EP0771011B1 (de) 2001-07-11

Family

ID=9483839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402193A Expired - Lifetime EP0771011B1 (de) 1995-10-24 1996-10-15 Gemischter Magnetkern

Country Status (7)

Country Link
US (1) US5748013A (de)
EP (1) EP0771011B1 (de)
JP (1) JPH09129435A (de)
AT (1) ATE203123T1 (de)
CA (1) CA2188382A1 (de)
DE (1) DE69613794T2 (de)
FR (1) FR2740259B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593132A2 (de) * 2003-01-30 2005-11-09 Metglas, Inc. Gespaltener amorpher magnetkern auf metallbasis
WO2020128268A1 (fr) 2018-12-21 2020-06-25 Safran Noyau magnétique comportant une caractéristique constitutive variant spatialement

Families Citing this family (34)

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Publication number Priority date Publication date Assignee Title
FR2738949B1 (fr) * 1995-09-19 1997-10-24 Thomson Csf Materiau magnetique composite a permeabilite et pertes reduites
US6144279A (en) * 1997-03-18 2000-11-07 Alliedsignal Inc. Electrical choke for power factor correction
AR024092A1 (es) * 1999-05-26 2002-09-04 Abb Ab Dispositivos de induccion con entrehierros distribuidos
FR2795855B1 (fr) 1999-06-29 2001-10-05 Thomson Csf Ferrites a faibles pertes
CA2282636A1 (en) 1999-09-16 2001-03-16 Philippe Viarouge Power transformers and power inductors for low frequency applications using isotropic composite magnetic materials with high power to weight ratio
US6512438B1 (en) * 1999-12-16 2003-01-28 Honeywell International Inc. Inductor core-coil assembly and manufacturing thereof
DE10000116A1 (de) * 2000-01-04 2001-07-26 Epcos Ag Sensor zur Messung eines Gleichstroms und Messverfahren
GB0008158D0 (en) * 2000-04-03 2000-05-24 Abb Ab A variable induction device
US6812707B2 (en) 2001-11-27 2004-11-02 Mitsubishi Materials Corporation Detection element for objects and detection device using the same
US7154368B2 (en) * 2003-10-15 2006-12-26 Actown Electricoil, Inc. Magnetic core winding method, apparatus, and product produced therefrom
FR2879593B1 (fr) * 2004-12-20 2007-03-02 Thales Sa Materiau ferrite a faibles pertes en hyperfrequence et procede de fabrication
JP2006216650A (ja) * 2005-02-02 2006-08-17 Sumida Corporation 磁性素子および磁性素子の製造方法
US7864013B2 (en) * 2006-07-13 2011-01-04 Double Density Magnetics Inc. Devices and methods for redistributing magnetic flux density
JP5023601B2 (ja) * 2006-08-04 2012-09-12 住友電気工業株式会社 リアクトル
JP2008140838A (ja) * 2006-11-30 2008-06-19 Matsushita Electric Ind Co Ltd インダクタ部品とこれを用いた電子機器
US7710228B2 (en) * 2007-11-16 2010-05-04 Hamilton Sundstrand Corporation Electrical inductor assembly
US20090128276A1 (en) * 2007-11-19 2009-05-21 John Horowy Light weight reworkable inductor
US20090302986A1 (en) * 2008-06-10 2009-12-10 Bedea Tiberiu A Minimal-length windings for reduction of copper power losses in magnetic elements
US20100059258A1 (en) * 2008-08-19 2010-03-11 Xu Yang Ferrite Mosaic and Magnetic Core Structure for Passive Substrate for Switched-Mode Power Supply Module
EP2209128B1 (de) * 2009-01-20 2015-03-04 ABB Research Ltd. Magnetjoch mit Spalten
US8212641B2 (en) * 2009-02-27 2012-07-03 Cyntec Co., Ltd. Choke
US9117580B2 (en) 2009-02-27 2015-08-25 Cyntec Co., Ltd. Choke
WO2011027559A1 (ja) * 2009-09-03 2011-03-10 パナソニック株式会社 コイル部品およびその製造方法
DE102011055880B4 (de) 2010-12-08 2022-05-05 Tdk Electronics Ag Induktives Bauelement mit verbesserten Kerneigenschaften
US9019062B2 (en) 2010-12-08 2015-04-28 Epcos Ag Inductive device with improved core properties
JP5333521B2 (ja) 2011-06-06 2013-11-06 株式会社豊田自動織機 磁性コア
DE102012213263A1 (de) * 2011-09-20 2013-03-21 Robert Bosch Gmbh Handwerkzeugvorrichtung mit zumindest einer Ladespule
CN103827765B (zh) * 2011-09-30 2016-09-07 英特尔公司 在耦合与解耦状态之间切换的电感器
JP2012094924A (ja) * 2012-02-16 2012-05-17 Sumitomo Electric Ind Ltd リアクトル
KR102318230B1 (ko) * 2014-12-11 2021-10-27 엘지이노텍 주식회사 인덕터
KR102347720B1 (ko) * 2016-05-13 2022-01-07 코닝 인코포레이티드 도핑된 다결정 세라믹 광학 장치를 포함하는 양자 메모리 시스템 및 양자 리피터 시스템 및 그의 제조 방법
US10553280B2 (en) * 2017-03-01 2020-02-04 Corning Incorporated Quantum memory systems and quantum repeater systems comprising doped polycrystalline ceramic optical devices and methods of manufacturing the same
CN108735449A (zh) * 2017-04-25 2018-11-02 台达电子工业股份有限公司 磁性组件、电感及变压器
CN112753072A (zh) 2018-09-24 2021-05-04 康宁股份有限公司 掺杂稀土的金属氧化物陶瓷波导量子存储器及其制造方法

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DE1159088B (de) * 1960-04-26 1963-12-12 Siemens Ag Saettigungsdrosselspule, insbesondere fuer Antriebe mit stromrichtergespeisten Gleichstrommaschinen
EP0004272A2 (de) * 1978-03-22 1979-10-03 Robert Bosch Gmbh Verfahren zur Herstellung von Pressmassen mit weichmagnetischen Eigenschaften
DE3040368A1 (de) * 1980-10-25 1982-05-27 Vogt Gmbh & Co Kg, 8391 Erlau Ferromagnetischer kern mit magnetisch gefuelltem luftspalt
JPS59210623A (ja) * 1983-05-14 1984-11-29 Matsushita Electric Works Ltd 磁心
DE3412003A1 (de) * 1984-03-31 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Elektrische spule, insbesondere fuer die zuendanlage einer brennkraftmaschine bestimmte zuendspule
JPS61150206A (ja) * 1984-12-24 1986-07-08 Toshiba Corp 静止誘導電器
DE8609584U1 (de) * 1986-04-09 1987-08-06 Philips Patentverwaltung Gmbh, 2000 Hamburg, De
US4731191A (en) * 1985-12-31 1988-03-15 Dow Corning Corporation Method for protecting carbonyl iron powder and compositions therefrom
EP0532788A1 (de) * 1990-06-11 1993-03-24 Daido Tokushuko Kabushiki Kaisha Verfahren zur Herstellung von schmelzgegossenem magnetischem Weichferrit

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DE1159088B (de) * 1960-04-26 1963-12-12 Siemens Ag Saettigungsdrosselspule, insbesondere fuer Antriebe mit stromrichtergespeisten Gleichstrommaschinen
EP0004272A2 (de) * 1978-03-22 1979-10-03 Robert Bosch Gmbh Verfahren zur Herstellung von Pressmassen mit weichmagnetischen Eigenschaften
DE3040368A1 (de) * 1980-10-25 1982-05-27 Vogt Gmbh & Co Kg, 8391 Erlau Ferromagnetischer kern mit magnetisch gefuelltem luftspalt
JPS59210623A (ja) * 1983-05-14 1984-11-29 Matsushita Electric Works Ltd 磁心
DE3412003A1 (de) * 1984-03-31 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Elektrische spule, insbesondere fuer die zuendanlage einer brennkraftmaschine bestimmte zuendspule
JPS61150206A (ja) * 1984-12-24 1986-07-08 Toshiba Corp 静止誘導電器
US4731191A (en) * 1985-12-31 1988-03-15 Dow Corning Corporation Method for protecting carbonyl iron powder and compositions therefrom
DE8609584U1 (de) * 1986-04-09 1987-08-06 Philips Patentverwaltung Gmbh, 2000 Hamburg, De
EP0532788A1 (de) * 1990-06-11 1993-03-24 Daido Tokushuko Kabushiki Kaisha Verfahren zur Herstellung von schmelzgegossenem magnetischem Weichferrit

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593132A2 (de) * 2003-01-30 2005-11-09 Metglas, Inc. Gespaltener amorpher magnetkern auf metallbasis
EP1593132A4 (de) * 2003-01-30 2011-03-09 Metglas Inc Gespaltener amorpher magnetkern auf metallbasis
WO2020128268A1 (fr) 2018-12-21 2020-06-25 Safran Noyau magnétique comportant une caractéristique constitutive variant spatialement
FR3090990A1 (fr) * 2018-12-21 2020-06-26 Safran Noyau magnétique comportant une caractéristique constitutive variant spatialement

Also Published As

Publication number Publication date
DE69613794D1 (de) 2001-08-16
DE69613794T2 (de) 2001-11-29
ATE203123T1 (de) 2001-07-15
FR2740259B1 (fr) 1997-11-07
US5748013A (en) 1998-05-05
FR2740259A1 (fr) 1997-04-25
EP0771011B1 (de) 2001-07-11
CA2188382A1 (fr) 1997-04-25
JPH09129435A (ja) 1997-05-16

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