EP0388930A1 - E-I core with an air gap - Google Patents

E-I core with an air gap Download PDF

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Publication number
EP0388930A1
EP0388930A1 EP90105359A EP90105359A EP0388930A1 EP 0388930 A1 EP0388930 A1 EP 0388930A1 EP 90105359 A EP90105359 A EP 90105359A EP 90105359 A EP90105359 A EP 90105359A EP 0388930 A1 EP0388930 A1 EP 0388930A1
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EP
European Patent Office
Prior art keywords
core
air gap
legs
core according
grinding
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Withdrawn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
EP90105359A
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German (de)
French (fr)
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.)
Vogt Electronic AG
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Vogt Electronic AG
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Filing date
Publication date
Application filed by Vogt Electronic AG filed Critical Vogt Electronic AG
Publication of EP0388930A1 publication Critical patent/EP0388930A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to an E-I core according to the introductory part of patent claim 1 and to a method for adjusting the air gap in an E-I core according to the invention.
  • air gaps are required in the E-I cores used there, which reduce the saturation magnetization of the E-I cores, which are preferably made of ferrite. These air gaps were realized either by removing the length of the middle leg of the E-part of the core or by intermediate layers on all three legs of the core.
  • the invention has for its object to provide an EI core according to the introductory part of claim 1, the production of which does not require any special grinding technique, in which the air gap is not in the area of the coil winding and which, if necessary, can also be designed in a simple manner can that stray fields are avoided on the outer legs.
  • the air gap is embedded in the I part thereof, which, e.g. with ferrite as the core material by a corresponding pressing and sintering process can be realized very easily without additional costs.
  • the associated E-part of the core can be produced in the known manner, the pole faces of the legs being made plane-parallel by simple grinding.
  • the invention also provides a method for simple, very precise adjustment of the air gap in an EI core according to the invention. This method is characterized in claims 5 and 6.
  • the height of the air gap can then be adapted to the requirements by removing material from the pole faces of the I part of the core, preferably simply by grinding these surfaces, if the air gap is initially chosen to be larger than required.
  • 1 denotes the air gap
  • 2 the I part of the core
  • 3 the E part.
  • the air gap 1 is predetermined in the I part of the core and is located here in the area opposite the middle leg of the E part 3.
  • the core parts 2 and 3 are first made in a known manner, e.g. with ferrite as the core material, produced by pressing and sintering, the air gap 1 being given an excess for the time being. Then the pole faces of the E part and the pole faces of the I part lying on the outer legs of the E part are made plane-parallel by simple grinding. When grinding the pole faces of the I part, so much material is removed until the air gap has reached the intended height, which can be achieved very easily and with great accuracy in this way.

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  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

An E-I core is described whose air gap 1 is situated in the I-part 2 of the core by being pressed in. <IMAGE>

Description

Die Erfindung bezieht sich auf einen E-I-Kern gemäß dem einleitenden Teil des Patentanspruchs 1 und auf ein Verfah­ren zum Einstellen des Luftspalts bei einem E-I-Kern gemäß der Erfindung.The invention relates to an E-I core according to the introductory part of patent claim 1 and to a method for adjusting the air gap in an E-I core according to the invention.

Für viele induktive Anwendungen in der Elektronik sind in den dort verwendeten E-I-Kernen Luftspalte erforderlich, die die Sättigungsmagnetisierung der vorzugsweise aus Ferrit bestehenden E-I-Kerne herabsetzen. Diese Luftspalte wurden entweder durch Abtragen der Länge des Mittelschen­kels des E-Teils des Kerns oder durch Zwischenlagen an allen drei Schenkeln von diesem realisiert.For many inductive applications in electronics, air gaps are required in the E-I cores used there, which reduce the saturation magnetization of the E-I cores, which are preferably made of ferrite. These air gaps were realized either by removing the length of the middle leg of the E-part of the core or by intermediate layers on all three legs of the core.

Das Abtragen des Mittelschenkels des E-Teils -meistens durch Schleifen realisiert- erfordert eine besondere Schleiftechnik, die aufwendig ist. Außerdem liegt dann normalerweise der Luftspalt schon im Bereich der Spulen­wicklung, in der durch die austretenden magnetischen Feld­linien Wirbelströme induziert werden, die die Güte der Spule herabsetzen.The removal of the middle leg of the E-part - mostly realized by grinding - requires a special grinding technique that is complex. In addition, the air gap then normally already lies in the area of the coil winding, in which eddy currents are induced by the emerging magnetic field lines, which reduce the quality of the coil.

Wenn der Luftspalt durch Zwischenlagen zwischen dem E-Teil und dem I-Teil des Kerns realisiert wird, ergeben sich an den äußeren Schenkein Streufelder, die in magnetempfind­lichen Geräten zu Störungen führen können oder zusätzliche Abschirmmaßnahmen erfordern.If the air gap is realized by intermediate layers between the E-part and the I-part of the core, there are no stray fields on the outer legs, which can lead to faults in magnetically sensitive devices or require additional shielding measures.

Der Erfindung liegt die Aufgabe zugrunde, einen E-I-Kern gemäß dem einleitenden Teil des Patentanspruchs 1 zu schaf­fen, dessen Herstellung keine besondere Schleiftechnik erfordert, bei dem der Luftspalt auch nicht im Bereich der Spulenwicklung liegt und der im Bedarfsfalle auf einfa­che Weise auch so gestaltet werden kann, daß an den äußeren Schenkeln Streufelder vermieden sind.The invention has for its object to provide an EI core according to the introductory part of claim 1, the production of which does not require any special grinding technique, in which the air gap is not in the area of the coil winding and which, if necessary, can also be designed in a simple manner can that stray fields are avoided on the outer legs.

Die vor stehende Aufgabe wird durch die Merkmale des Patent­anspruchs 1 gelöst.The above task is solved by the features of claim 1.

Bei dem erfindungsgemäßen E-I-Kern ist der Luftspalt in dem I-Teil von diesem eingelassen, was -z.B. bei Ferrit als Kernmaterial durch ein entsprechendes Preß- und Sinter­verfahren- sehr leicht ohne zusätzliche Kosten realisiert werden kann. Der zugehörige E-Teil des Kerns kann nach der bekannten Art hergestellt werden, wobei die Polflächen der Schenkel durch einfaches Überschleifen planparallel gestaltet sind.In the E-I core according to the invention, the air gap is embedded in the I part thereof, which, e.g. with ferrite as the core material by a corresponding pressing and sintering process can be realized very easily without additional costs. The associated E-part of the core can be produced in the known manner, the pole faces of the legs being made plane-parallel by simple grinding.

Die abhängigen Patentansprüche 2 - 4 haben bevorzugte Ausführungsformen des erfindungsgemäßen E-I-Kerns zum Gegenstand. Die Ausführungsform gemäß Patentanspruch 2 ergibt einen Kern ohne Streufelder an den äußeren Schen­keln.Dependent claims 2-4 relate to preferred embodiments of the E-I core according to the invention. The embodiment according to claim 2 results in a core without stray fields on the outer legs.

Die Erfindung schafft auch ein Verfahren zum einfachen, sehr genauen Einstellen des Luftspalts bei einem erfin­dungsgemäßen E-I-Kern. Dieses Verfahren ist in den Patent­ansprüchen 5 und 6 gekennzeichnet. Danach kann die Höhe des Luftspaltes durch Abtragung von Material an den Polflä­chen des I-Teils des Kerns, vorzugsweise durch einfaches Überschleifen dieser Flächen, den Erfordernissen angepaßt werden, wenn der Luftspalt zunächst größer gewählt wird als erforderlich.The invention also provides a method for simple, very precise adjustment of the air gap in an EI core according to the invention. This method is characterized in claims 5 and 6. The height of the air gap can then be adapted to the requirements by removing material from the pole faces of the I part of the core, preferably simply by grinding these surfaces, if the air gap is initially chosen to be larger than required.

In der Zeichnung ist als Beispiel eine bevorzugte Ausfüh­rungsform des erfindungsgemäßen E-I-Kerns in Seitenansicht dargestellt.In the drawing, a preferred embodiment of the E-I core according to the invention is shown in side view as an example.

In der Zeichnung bezeichnen 1 den Luftspalt, 2 den I-Teil des Kerns und 3 dessen E-Teil. Der Luftspalt 1 ist in dem I-Teil des Kerns vorgegeben und befindet sich hier in dessen dem Mittelschenkel des E-Teils 3 gegenüberliegen­den Bereich.In the drawing, 1 denotes the air gap, 2 the I part of the core and 3 the E part. The air gap 1 is predetermined in the I part of the core and is located here in the area opposite the middle leg of the E part 3.

Die Kernteile 2 und 3 werden zunächst in bekannter Weise, z.B. bei Ferrit als Kernmaterial durch Pressen und Sintern, hergestellt, wobei dem Luftspalt 1 vorerst ein Übermaß gegeben wird. Dann werden die Polflächen des E-Teils und die den äußeren Schenkeln des E-Teils aufliegenden Polflä­chen des I-Teils durch einfaches Überschleifen planparallel gestaltet. Beim Schleifen der Polflächen des I-Teils wird so viel Material abgetragen, bis der Luftspalt die vorgese­hene Höhe erhalten hat, was auf diese Weise sehr einfach und mit großer Genauigkeit erreichbar ist.The core parts 2 and 3 are first made in a known manner, e.g. with ferrite as the core material, produced by pressing and sintering, the air gap 1 being given an excess for the time being. Then the pole faces of the E part and the pole faces of the I part lying on the outer legs of the E part are made plane-parallel by simple grinding. When grinding the pole faces of the I part, so much material is removed until the air gap has reached the intended height, which can be achieved very easily and with great accuracy in this way.

Claims (6)

1. E-I-Kern mit einem Luftspalt, dadurch gekennzeichnet, daß der Luftspalt (1) in dem I-Teil (2) des Kerns vorgesehen ist.1. EI core with an air gap, characterized in that the air gap (1) is provided in the I part (2) of the core. 2. E-I-Kern nach Anspruch 1, dadurch gekennzeichnet, daß der Luftspalt (1) in dem Bereich des I-Teils (2) des Kerns vorgesehen ist, der dem Mittelschenkel des E-Teils (3) des Kerns gegenüberliegt.2. EI core according to claim 1, characterized in that the air gap (1) is provided in the region of the I part (2) of the core, which lies opposite the middle leg of the E part (3) of the core. 3. E-I-Kern nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß der E-Teil (3) des Kerns stirnseitig an den Enden der Schenkel nur planparallel geschliffen ist.3. EI core according to claim 1 or 2, characterized in that the E-part (3) of the core is only ground plane-parallel at the ends of the legs. 4. E-I-Kern nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er aus Ferrit besteht.4. EI core according to one or more of the preceding claims, characterized in that it consists of ferrite. 5. Verfahren zum Einstellen des Luftspalts bei einem E-I-Kern nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Luftspalt (1) bei der Herstellung des I-Teils (2) des Kerns zunächst mit Übermaß in diesen eingebracht und dann durch Materialabtragung an den den Schenkeln des E-Teils (3) des Kerns aufliegenden Polflächen des I-Teils (2) auf das richtige Maß eingestellt wird.5. A method for adjusting the air gap in an EI core according to one or more of the preceding claims, characterized in that the air gap (1) in the manufacture of the I-part (2) of the core is first introduced in excess and then through Material removal on the pole faces of the I-part (2) lying on the legs of the E-part (3) of the core is set to the correct dimension. 6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Materialbatragung durch Schleifen vorgenommen wird.6. The method according to claim 5, characterized in that the material bathing is carried out by grinding.
EP90105359A 1989-03-23 1990-03-21 E-I core with an air gap Withdrawn EP0388930A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893909624 DE3909624A1 (en) 1989-03-23 1989-03-23 E-I - CORE WITH AIR GAP
DE3909624 1989-03-23

Publications (1)

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EP0388930A1 true EP0388930A1 (en) 1990-09-26

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DE (1) DE3909624A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264397A (en) * 1992-02-20 1993-08-25 Gen Electric Low-profile multi-post magnetic core and gap arrangement
EP0779633A1 (en) * 1995-06-30 1997-06-18 Hitachi Metals, Ltd. Magnetic core
WO2002025677A2 (en) * 2000-09-20 2002-03-28 Ascom Energy Systems Ag, Berne Planar inductive element
WO2009121627A2 (en) * 2008-04-04 2009-10-08 Vogt Electronic Components Gmbh Inductive component for activating lights
WO2015189245A1 (en) * 2014-06-11 2015-12-17 SUMIDA Components & Modules GmbH Method for forming a frame core having a center leg for an inductive component and frame core produced accordingly
US11670444B2 (en) * 2018-06-05 2023-06-06 Abb Power Electronics Inc. Integrated magnetic assemblies and methods of assembling same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1597508A (en) * 1976-12-23 1981-09-09 Licentia Gmbh E-cores
DE3318370A1 (en) * 1983-05-20 1984-11-22 Waasner, Bruno, 8550 Forchheim SHEET CUT FROM TWO PARTS AND WITH THREE LEGS
CH647090A5 (en) * 1979-05-19 1984-12-28 Philberth Karl CORE SHEET FOR SHELL CORES, ESPECIALLY FOR TRANSFORMERS.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451202A (en) * 1945-02-21 1948-10-12 Acme Electric Corp Laminated magnetic core and method of making

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1597508A (en) * 1976-12-23 1981-09-09 Licentia Gmbh E-cores
CH647090A5 (en) * 1979-05-19 1984-12-28 Philberth Karl CORE SHEET FOR SHELL CORES, ESPECIALLY FOR TRANSFORMERS.
DE3318370A1 (en) * 1983-05-20 1984-11-22 Waasner, Bruno, 8550 Forchheim SHEET CUT FROM TWO PARTS AND WITH THREE LEGS

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2264397A (en) * 1992-02-20 1993-08-25 Gen Electric Low-profile multi-post magnetic core and gap arrangement
US5414401A (en) * 1992-02-20 1995-05-09 Martin Marietta Corporation High-frequency, low-profile inductor
EP0779633A1 (en) * 1995-06-30 1997-06-18 Hitachi Metals, Ltd. Magnetic core
EP0779633A4 (en) * 1995-06-30 1998-09-30 Hitachi Metals Ltd Magnetic core
WO2002025677A2 (en) * 2000-09-20 2002-03-28 Ascom Energy Systems Ag, Berne Planar inductive element
WO2002025677A3 (en) * 2000-09-20 2002-09-06 Ascom Energy Systems Ag Berne Planar inductive element
US6967553B2 (en) 2000-09-20 2005-11-22 Delta Energy Systems (Switzerland) Ag Planar inductive element
WO2009121627A2 (en) * 2008-04-04 2009-10-08 Vogt Electronic Components Gmbh Inductive component for activating lights
WO2009121627A3 (en) * 2008-04-04 2009-12-10 Vogt Electronic Components Gmbh Inductive component for activating lights
WO2015189245A1 (en) * 2014-06-11 2015-12-17 SUMIDA Components & Modules GmbH Method for forming a frame core having a center leg for an inductive component and frame core produced accordingly
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
US11670444B2 (en) * 2018-06-05 2023-06-06 Abb Power Electronics Inc. Integrated magnetic assemblies and methods of assembling same

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Publication number Publication date
DE3909624A1 (en) 1990-09-27

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