EP1993111B1 - Kühlung eines Magnetkerns einer Induktionsspule - Google Patents

Kühlung eines Magnetkerns einer Induktionsspule Download PDF

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Publication number
EP1993111B1
EP1993111B1 EP20080103955 EP08103955A EP1993111B1 EP 1993111 B1 EP1993111 B1 EP 1993111B1 EP 20080103955 EP20080103955 EP 20080103955 EP 08103955 A EP08103955 A EP 08103955A EP 1993111 B1 EP1993111 B1 EP 1993111B1
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EP
European Patent Office
Prior art keywords
axis
core
plates
magnetic
cooling
Prior art date
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Active
Application number
EP20080103955
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English (en)
French (fr)
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EP1993111A1 (de
Inventor
Bernard Gollentz
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.)
GE Energy Power Conversion Technology Ltd
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Converteam Technology Ltd
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Publication of EP1993111A1 publication Critical patent/EP1993111A1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented

Definitions

  • inductors used in the equipment, namely the so-called “air” inductors and “iron” inductors.
  • Air inductors have the advantage of not saturating, but are bulky and have the risk of radiating and inducing eddy currents in all nearby conductors.
  • Iron inductors have an iron core that allows better channeling of the magnetic flux, making them compact inductors with a much lower radiation risk than air inductors. These inductors are often more suitable for cabinetry.
  • the major disadvantage for iron inductances is losses in the iron core. These losses, which are decomposed into losses by hysteresis and losses by induced currents, increase very rapidly with the frequency of the current in the windings, to the point that the harmonic losses can be preponderant compared to the fundamental.
  • Typical inductances are designed which generate a maximum loss density of the order of 3 W / kg. If on a first design, this level is exceeded, we add air gaps to limit the magnetic field and therefore iron losses, but in return, we must increase the number of windings and the section of iron.
  • the inductances are traversed by a fundamental current of high frequency, with an important harmonic content.
  • the inductances take on significant dimensions with a large section of iron and many windings, these inductances then have very significant losses by conduction (the dissipation of the inductance alone is as important as the dissipation of all the other elements (IGBT, diodes ).
  • the present invention aims to overcome these disadvantages.
  • the master sheet in addition to its traditional function of mechanical support, acts as a heat collector and radiator, the fluid flowing in the cooling tubes carrying the calories collected by the master sheet and ensuring the temperature maintenance of the magnetic core and the proper operation of the induction coil for which it is intended.
  • two cooling tubes are welded to each master plate parallel to the axis of the core.
  • each tie may have at each of its ends a head protruding from the respective main sheet, said heads being aligned parallel to the axis, the two cooling tubes being welded to each master plate on either side of the alignment of the tie rods.
  • the invention also relates to an induction coil comprising a magnetic circuit comprising at least one magnetic core as described above.
  • the whole of the figure 1 comprises three coils wound on three magnetic cores, including the winding 2 of the coil 1b wound on the core 3, the latter being shown in section on the figure 2 .
  • the three cores are, in the usual way, arranged parallel and connected to the flux return elements 4 of the magnetic circuit.
  • Each magnetic core is composed in a known manner of a set of packets of sheets 5 of magnetic material, typically iron, one of these packets being shown in axial section at the figure 2 . It will be observed that such a core is generally cylindrical and comprises an axis 6.
  • the packets 5 are formed of individual sheets 7 whose planes are parallel to the axis 6, cut into different patterns so that their assembly has a section approaching the circular section of the coil to optimize the flow of magnetic flux.
  • All the sheets 7 of the same package 5 are pierced at their center with a hole 8 in which is arranged, without contact with the sheets, a tube 9 made of insulating material.
  • a tie rod 10 is engaged inside the tube 9.
  • the different packets of sheets of a magnetic core are arranged one after the other along the axis 6 of the core, separated by air gaps 11, as shown in FIG. figure 1 .
  • the gaps 11 consist of plates of electrically insulating material disposed perpendicular to the axis 6.
  • the electrically insulating material of the gaps 11 is also thermally insulating, which has the disadvantage of promoting a heating of the core, which the invention aims to overcome.
  • the assembly of the plate bundles 5 and the air gaps 11 of a core is ensured by means of two aluminum master plates 12, arranged on either side of the core, parallel to the plates and to the core axis. .
  • These sheets 12 are generally rectangular and press the bundles of sheets 5 over the entire axial length of the core.
  • the main plates 12 are drilled opposite the holes 8 of the sheets so that the tie rods 10 pass through them.
  • the tubes 9 bear on the master plates 12 on the side of the plates 7.
  • the aluminum master plates 12 ensure the heat conduction of a bundle of sheets to adjacent packets, while preventing the flow of magnetic flux.
  • the tie rods 10 press the sheets 7 through the master plates 12.
  • the tie rods 10 bear against the master plates 12 by means of their heads 13, for example nuts screwed onto the threaded ends of the tie rods 10.
  • Insulating washers 14 are interposed between the heads 13 of the tie rods 10 and the master plates 12.
  • the heads 13 of the tie rods 10 are generally aligned parallel to the axis 6.
  • the tube 9 and the washers 14 provide electrical insulation of the tie rod 10 vis-à-vis the master plates 12, limiting the flow of induced currents that could cause significant heating of the tie rod.
  • Two cooling tubes 15 are welded to the outside of each master plate 12, on the opposite side to the plates 7.
  • the tubes 15 are here parallel to the axis 6.
  • each tube 15 The two ends of each tube 15 are provided with connectors 16 ( figure 1 ) for connecting each tube to a circuit 17 for circulating cooling fluid.
  • a pump not shown is mounted on the circuit 17 to ensure the circulation of the cooling fluid.
  • the heat released in the sheet bundles 5 is thus collected by the master plates 12 and discharged by the fluid circulating in the cooling tubes 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)

Claims (4)

  1. Magnetkern für eine Induktorspule, Folgendes aufweisend:
    - eine Vielzahl von Paketen (5) von aus Magnetmaterial bestehenden Blechen (7), die durch Spalte (11) aus isolierendem Material getrennt sind, wobei die Pakete aufeinanderfolgend entlang einer Achse (6) des Kerns mit den Blechen parallel zur Achse und den Spalten senkrecht zur Achse angeordnet sind;
    - mindestens einen Zuganker (10), der jedes Blechpaket senkrecht zur Achse durchquert, um die Verbindung der Bleche jedes Paktes sicherzustellen;
    - und eine Ankerdeckplatte (12), die von den Zugankern auf jeder Seite der Vielzahl von Paketen parallel zu den Blechen angedrückt wird, um die Verbindung der Bestandteile des Kerns sicherzustellen;
    dadurch gekennzeichnet, dass die Ankerdeckplatte aus einem nicht magnetischen, wärmeleitenden Material hergestellt ist, und dass der Kern darüber hinaus mindestens ein Kühlrohr (15) aufweist, das an mindestens eine der Ankerdeckplatten angeschweißt ist, wobei darüber hinaus Verbindungseinrichtungen (16) vorgesehen sind, um das mindestens eine Kühlrohr mit einem Umwälzkreislauf (17) einer Kühlflüssigkeit zu verbinden.
  2. Magnetkern nach Anspruch 1, zwei Kühlrohre aufweisend, die parallel zur Achse des Kerns an jede Ankerdeckplatte angeschweißt sind.
  3. Magnetkern nach Anspruch 2, wobei jeder Zuganker an jedem seiner Enden ein Kopfstück (13) besitzt, das von der jeweiligen Ankerdeckplatte übersteht, wobei die Kopfstücke parallel zur Achse ausgerichtet sind, wobei die beiden Kühlrohre auf beiden Seiten der Fluchtlinie der Kopfstücke der Zuganker an jede Ankerdeckplatte angeschweißt sind.
  4. Induktorspule, dadurch gekennzeichnet, dass sie einen Magnetkreis aufweist, der mindestens einen Magnetkern nach einem der Ansprüche 1 bis 3 umfasst.
EP20080103955 2007-05-16 2008-05-14 Kühlung eines Magnetkerns einer Induktionsspule Active EP1993111B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0755110A FR2916298B1 (fr) 2007-05-16 2007-05-16 Refroidissement du noyau magnetique d'une bobine d'induction

Publications (2)

Publication Number Publication Date
EP1993111A1 EP1993111A1 (de) 2008-11-19
EP1993111B1 true EP1993111B1 (de) 2010-02-17

Family

ID=38951728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080103955 Active EP1993111B1 (de) 2007-05-16 2008-05-14 Kühlung eines Magnetkerns einer Induktionsspule

Country Status (3)

Country Link
EP (1) EP1993111B1 (de)
DE (1) DE602008000643D1 (de)
FR (1) FR2916298B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2995127B1 (fr) 2012-08-31 2016-02-05 Ge Energy Power Conversion Technology Ltd Noyau magnetique pour un composant magnetique a bobinage, comportant des moyens de refroidissement perfectionnes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1237215B (de) * 1963-03-11 1967-03-23 Licentia Gmbh Spannvorrichtung zum Zusammenpressen von einem aus Blechen mit zwischengelegtem Spalt geschichteten Eisenkern fuer Transformatoren
FR1418855A (fr) * 1964-07-01 1965-11-26 Comp Generale Electricite Bobine de réactance
US4039990A (en) * 1975-10-01 1977-08-02 General Electric Company Sheet-wound, high-voltage coils
US5483143A (en) * 1994-04-29 1996-01-09 Hughes Aircraft Company Composite core designed for inductive coupled transformer probes
GB2331852A (en) * 1997-11-28 1999-06-02 Asea Brown Boveri Transformer winding arrangements
DE19756188A1 (de) * 1997-12-17 1999-06-24 Trw Nelson Bolzenschweisstechn Leistungsübertrager für ein Leistungsschaltnetzteil, insbesondere für Bolzenschweißgeräte

Also Published As

Publication number Publication date
EP1993111A1 (de) 2008-11-19
FR2916298B1 (fr) 2009-08-21
FR2916298A1 (fr) 2008-11-21
DE602008000643D1 (de) 2010-04-01

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