EP1030319B1 - Ringkern - Google Patents

Ringkern Download PDF

Info

Publication number
EP1030319B1
EP1030319B1 EP99123475A EP99123475A EP1030319B1 EP 1030319 B1 EP1030319 B1 EP 1030319B1 EP 99123475 A EP99123475 A EP 99123475A EP 99123475 A EP99123475 A EP 99123475A EP 1030319 B1 EP1030319 B1 EP 1030319B1
Authority
EP
European Patent Office
Prior art keywords
toroidal core
air gap
toroidal
core
characteristic
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.)
Expired - Lifetime
Application number
EP99123475A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1030319A1 (de
Inventor
Aloys Wobben
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1030319A1 publication Critical patent/EP1030319A1/de
Application granted granted Critical
Publication of EP1030319B1 publication Critical patent/EP1030319B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons

Definitions

  • Ring cores are widely used in electrical engineering, in particular in coils for increasing the inductance.
  • a choke coil whose ohmic resistance is low in comparison to the inductive reactance.
  • a toroidal core such as a laminated iron core
  • the inductance of such a choke coil is substantially increased (iron chokes). If the iron path is closed, it often receives air gaps to reduce the influence of iron saturation (throttle air gap).
  • the magnetization characteristics of coils or inductors can be set to a desired value.
  • Such inductors are increasingly used in modern power electronics in the higher power range.
  • an application such as the smoothing of pulsating DC, DC filtering, decoupling of systems or for voltage regulator (buck converter, boost converter) may be mentioned.
  • Further fields of application for inductors with a toroidal core are short-circuit reactors in an inverter branch or filter throttles.
  • different magnetization characteristics as shown by way of example in FIG. 1, can then be set. These magnetization characteristics are then also called hysteresis loops.
  • the toroidal core has no air gap.
  • the toroid In the hysteresis magnetization characteristic of type b, the toroid has a relatively small air gap, and in the hysteresis magnetization characteristic of type c, the toroid has a very large air gap.
  • the air gap of a toroidal core can be concentrated in one place, so that one can see and measure the gap (macroscopic air gap). But it can also be divided over the magnetic circuit or the ring core several small air gaps. Then one speaks of a so-called "microscopic air gap". For this purpose, the effective air gap is distributed over the entire circumference of iron powder cores by admixing non-magnetic substances. Embodiments for a macroscopic and microscopic air gap are shown in FIG. 2.
  • a ring band core with a macroscopic air gap usually takes place as follows. First, you wrap a Dynamo sheet on a core, which is removed after the winding process again. Then you cut an air gap in the ring by means of a saw, a laser or a similar tool. Very small gaps can be made with this method, however, difficult and cumbersome, since the air gap width always depends directly on the tool width.
  • the object of the invention is to provide a toroidal core, which does not have the disadvantages described above and can be produced more easily and inexpensively. This results in further advantages such as a precise definition of the course of the magnetization characteristic and very low stray fields.
  • GB-A-2 133 932 discloses a toroidal core according to the preamble of claim 1.
  • the invention is based on the approach to produce the toroidal core from at least two layers of material / layers wound on top of each other, wherein the first layer is of a magnetically and electrically conductive material and the second layer consists of a non-magnetic and non-electrically conductive material.
  • a dynamo sheet may be used as the first laminated layer, while paper or film may be used for the second layer.
  • the desired magnetization characteristics can be adjusted. For example, when using very thin layer material, such as very thin paper, one obtains only a very slightly sheared characteristic, which corresponds to a very, very small air gap. If the shearing of the characteristic curve is to be greater, a correspondingly thicker, non-conductive layer material can be used.
  • toroidal cores Since only one winding process is necessary and no special materials must be used as in previous toroidal cores with microscopic air gap can be produced with conventional materials available on the market ring cores, which have a desired magnetization depending on the choice of materials and in particular the material thicknesses.
  • the production of toroidal cores with a very slightly sheared characteristic is easy to perform by using only very thin, non-conductive material. This has the consequence that an inductance with such a toroidal core with very slightly sheared characteristic also has very little stray fields, so that no stray fields occur in very powerful applications in power electronics.
  • Such a ring core undergoes no deformation even at high currents / magnetic fields and is therefore also preferably suitable for power electronics.
  • FIG. 1 shows three different types of characteristics.
  • the characteristic of type a shows a hysteresis loop of an inductance with a toroidal core without an air gap.
  • the characteristic is slightly sheared and the toroidal core has a relatively small air gap.
  • the characteristic of type c the characteristic is sheared very far and the toroid has a very large air gap.
  • Figure 2 shows the basic structure of a toroidal core with a macroscopic air gap - type 1 - and a toroidal core with a microscopic air gap - type 2.
  • the ring core of type 1 consists for example of a magnetically and electrically conductive material such as dynamo plate.
  • the ring core type 2 is also made of a magnetically and electrically conductive material, which, however, are mixed with non-magnetic substances.
  • Figure 3 shows a two-layer, wound toroidal core.
  • the first layer or position - solid line - consists here of a dynamo plate and the second layer / layer - dashed line - consists of a magnetically and electrically non-conductive material, such as paper or a film.
  • the desired magnetization characteristic can be determined in such a wound toroidal core by the number of windings and by the choice of material and layer thickness. If one chooses a relatively small thickness for the non-conductive material compared to the dynamo sheet, the result is a slightly sheared characteristic, with which an inductance in a toroidal core with a very small air gap can be achieved.
  • the magnetization characteristic can also be adjusted by the appropriate choice for the thickness of the conductive material, which always depends on the relation of the layer thicknesses of conductive and non-conductive material.
  • the dynamo plate may have a thickness of about 0.05 to 0.6 mm for low frequency applications, eg 50 Hertz. For applications with higher operating frequencies, sheet thicknesses of 0.1 to 0.3 mm can be used. When using the ring core in a short-circuit reactor or in a boost converter, the thickness of 0.23 mm for the material thickness of the dynamo plate is very suitable. For the thickness of the magnetically non-conductive material layer thicknesses of about 0.01 to 0.5 mm come into question. This material thickness reflects the amount of maximum flow of the throttle in the application. For short-circuit reactors, a layer thickness of 0.1 mm is very well suited for the non-conductive material layer.
  • Figure 5 shows such a known arrangement in which in addition to the main flow and the leakage flux is applied.
  • Magnetic field lines always try to take the easiest route. You should in the drawn geometry ( Figure 5) flow through the legs and the two yokes. However, the magnetic field lines must overcome 4 air gaps (magnetically non-conductive paths). This geometry will easily form stray fields as they represent an alternative to the desired path.
  • Figure 4 shows a toroidal core according to the invention and the associated Hauptfluß- or leakage flux distribution. Since the effective air gap is uniformly distributed over the entire circumference in the ring core shown in Figure 4, the magnetic conductivity is homogeneous over the entire magnetic length. There are no distinct barriers, such as a concentrated air gap, in the arrangement shown in FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)
EP99123475A 1999-02-20 1999-11-25 Ringkern Expired - Lifetime EP1030319B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19907320A DE19907320C2 (de) 1999-02-20 1999-02-20 Ringkern und dessen Verwendung
DE19907320 1999-02-20

Publications (2)

Publication Number Publication Date
EP1030319A1 EP1030319A1 (de) 2000-08-23
EP1030319B1 true EP1030319B1 (de) 2004-04-28

Family

ID=7898272

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99123475A Expired - Lifetime EP1030319B1 (de) 1999-02-20 1999-11-25 Ringkern

Country Status (9)

Country Link
EP (1) EP1030319B1 (ja)
JP (1) JP3648425B2 (ja)
AR (1) AR022629A1 (ja)
AT (1) ATE265736T1 (ja)
BR (1) BR0000298B1 (ja)
DE (2) DE19907320C2 (ja)
DK (1) DK1030319T3 (ja)
ES (1) ES2217676T3 (ja)
PT (1) PT1030319E (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10314265A1 (de) * 2003-03-29 2004-10-07 J. Pröpster GmbH Blitzschutzmaterial Metallwarenfabrik Entkopplungselement zur Entkopplung mindestens zweier Überspannungs-Schutzeinrichtungen einer baulichen Anlage
ES2343930B1 (es) * 2008-05-22 2011-06-28 Universidad Carlos Iii De Madrid Inductancia para corriente continua.
JP5555725B2 (ja) 2012-01-13 2014-07-23 本田技研工業株式会社 電気負荷制御装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495167A (en) * 1945-05-19 1950-01-17 Westinghouse Electric Corp Wound core
GB1115507A (en) * 1964-09-10 1968-05-29 Mini Of The Ministerul Ind Con Manufacturing processes of magnetic cores of stratified strips and sheets
DE2062694B2 (de) * 1970-09-08 1975-05-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen Fehlerstromschutzschalter
DE2913741A1 (de) * 1979-04-05 1980-10-09 Philips Patentverwaltung Verfahren zum herstellen von ringbandkernen fuer transformatoren und nach dem verfahren hergestellter ringbandkern
DE3031257A1 (de) * 1980-08-19 1982-03-18 Vacuumschmelze Gmbh, 6450 Hanau Verfahren zum herstellen von ringbandkernen fuer fehlerstromschutzschalter und verwendung dieser kerne
US4366520A (en) * 1981-03-25 1982-12-28 Magnetic Metals Corporation Differential transformer core for pulse currents
GB2105522A (en) * 1981-09-05 1983-03-23 Gen Motors Ltd Laminated core structure
US4558297A (en) * 1982-10-05 1985-12-10 Tdk Corporation Saturable core consisting of a thin strip of amorphous magnetic alloy and a method for manufacturing the same
GB2133932A (en) * 1982-12-31 1984-08-01 Int Research & Dev Co Ltd Improvements to strip wound magnetic cores
JPH0311603A (ja) * 1989-06-08 1991-01-18 Toshiba Corp 磁心
US5091253A (en) * 1990-05-18 1992-02-25 Allied-Signal Inc. Magnetic cores utilizing metallic glass ribbons and mica paper interlaminar insulation
JPH07201549A (ja) * 1994-01-11 1995-08-04 Nippon Steel Corp インダクタ素子

Also Published As

Publication number Publication date
DK1030319T3 (da) 2004-08-09
ES2217676T3 (es) 2004-11-01
EP1030319A1 (de) 2000-08-23
DE19907320A1 (de) 2000-08-31
ATE265736T1 (de) 2004-05-15
BR0000298B1 (pt) 2013-05-14
BR0000298A (pt) 2000-09-12
JP3648425B2 (ja) 2005-05-18
AR022629A1 (es) 2002-09-04
DE19907320C2 (de) 2001-03-08
JP2000243616A (ja) 2000-09-08
DE59909327D1 (de) 2004-06-03
PT1030319E (pt) 2004-09-30

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