EP1993111A1 - Cooling of the magnetic core of an induction coil. - Google Patents

Cooling of the magnetic core of an induction coil. Download PDF

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Publication number
EP1993111A1
EP1993111A1 EP08103955A EP08103955A EP1993111A1 EP 1993111 A1 EP1993111 A1 EP 1993111A1 EP 08103955 A EP08103955 A EP 08103955A EP 08103955 A EP08103955 A EP 08103955A EP 1993111 A1 EP1993111 A1 EP 1993111A1
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Prior art keywords
sheets
axis
core
magnetic
packets
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EP08103955A
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German (de)
French (fr)
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EP1993111B1 (en
Inventor
Bernard Gollentz
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GE Energy Power Conversion Technology Ltd
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Converteam SAS
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    • 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.
  • inductors for high-speed motors the inductances are traversed by a fundamental current of high frequency, with an important harmonic content.
  • the inductances take on large dimensions with a large section of iron and many windings, these inductors then have very significant conduction losses as well (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.

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

Abstract

The core has link sticks traversing packets of sheets perpendicular to an axis (6) for assuring connection of the sheets of each packet. A main sheet (12) is plated by the link sticks parallel to the sheets for assuring the connection of core elements, where the main sheet is made of non-magnetic heat conducting material i.e. aluminum. A cooling tube (15) is welded on the main sheet, and a connector (16) connects the cooling tube with a coolant circulation circuit (17).

Description

La présente invention concerne La présente invention concerne un noyau magnétique pour bobine d'induction, et plus particulièrement un tel noyau comprenant :

  • une pluralité de paquets de tôles en matériau magnétique séparés par des entrefers en matériau isolant, lesdits paquets étant disposés les uns à la suite des autres le long d'un axe du noyau avec les tôles parallèles à l'axe et les entrefers perpendiculaires à l'axe ;
  • au moins un tirant traversant chaque paquet de tôles perpendiculairement à l'axe pour assurer la solidarisation desdites tôles de chaque paquet ;
  • et une tôle maîtresse plaquée par lesdits tirants de chaque côté de ladite pluralité de paquets parallèlement aux tôles pour assurer la solidarisation des éléments du noyau.
The present invention relates to the present invention relates to a magnetic core for induction coil, and more particularly to such a core comprising:
  • a plurality of packets of sheets of magnetic material separated by air gaps of insulating material, said packets being arranged one after the other along an axis of the core with the sheets parallel to the axis and the air gaps perpendicular to the axis;
  • at least one tie passing through each pack of sheets perpendicular to the axis to ensure the joining of said sheets of each packet;
  • and a master plate pressed by said tie rods on each side of said plurality of packets parallel to the sheets for securing the elements of the core.

Il existe deux types d'inductances utilisés dans les équipements, à savoir les inductances dites "à air" et les inductances dites "à fer".There are two types of inductors used in the equipment, namely the so-called "air" inductors and "iron" inductors.

Les inductances à air ont l'avantage de ne pas saturer, mais sont volumineuses et présentent le risque de rayonner et d'induire des courants de Foucault dans tous conducteurs à proximité immédiate.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.

Les inductances à fer comportent un noyau en fer qui permet de mieux canaliser le flux magnétique, ce qui en fait des inductances compactes avec un risque de rayonnement nettement plus bas que les inductances à air. Ces inductances sont souvent plus appropriées pour être mise en armoire. L'inconvénient majeur pour les inductances à fer concerne les pertes dans le noyau de fer. Ces pertes fer, qui se décomposent en pertes par hystérésis et en pertes par courants induits, augmentent très rapidement avec la fréquence du courant dans les enroulements, au point que les pertes aux harmoniques peuvent être prépondérantes par rapport au fondamental.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.

On conçoit typiquement des inductances qui génèrent une densité de perte maximale de l'ordre de 3W/kg. Si sur une première conception, ce niveau est dépassé, on ajoute des entrefers pour limiter le champ magnétique et donc les pertes fer, mais en contrepartie, on doit augmenter le nombre d'enroulements et la section de fer.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.

Dans les inductances pour moteurs à grande vitesse, les inductances sont traversées par un courant fondamental de fréquence élevée, avec un contenu harmonique important. Il en résulte que les inductances prennent des dimensions importantes avec une large section de fer et de nombreux enroulements, ces inductances présentent alors des pertes par conduction très importantes également (la dissipation de l'inductance seule est aussi importante que la dissipation de tous les autres éléments (IGBT, diodes...).In inductors for high-speed motors, the inductances are traversed by a fundamental current of high frequency, with an important harmonic content. As a result, the inductances take on large dimensions with a large section of iron and many windings, these inductors then have very significant conduction losses as well (the dissipation of the inductance alone is as important as the dissipation of all the other elements (IGBT, diodes ...).

La présente invention vise à palier ces inconvénients.The present invention aims to overcome these disadvantages.

A cet effet, l'invention a tout d'abord pour objet un noyau magnétique pour bobine d'induction comprenant :

  • une pluralité de paquets de tôles en matériau magnétique séparés par des entrefers en matériau isolant, lesdits paquets étant disposés les uns à la suite des autres le long d'un axe du noyau avec les tôles parallèles à l'axe et les entrefers perpendiculaires à l'axe ;
  • au moins un tirant traversant chaque paquet de tôles perpendiculairement à l'axe pour assurer la solidarisation desdites tôles de chaque paquet ;
  • et une tôle maîtresse plaquée par lesdits tirants de chaque côté de ladite pluralité de paquets parallèlement aux tôles pour assurer la solidarisation des éléments du noyau ;
caractérisé par le fait que ladite tôle maîtresse est réalisée dans un matériau amagnétique conducteur de la chaleur, et que ledit noyau comprend en outre au moins un tube de refroidissement soudé sur au moins une des tôles maîtresses, des moyens étant en outre prévus pour raccorder ledit au moins un tube de refroidissement à un circuit de circulation d'un fluide de refroidissement.For this purpose, the invention firstly relates to a magnetic core for induction coil comprising:
  • a plurality of packets of sheets of magnetic material separated by air gaps of insulating material, said packets being arranged one after the other along an axis of the core with the sheets parallel to the axis and the air gaps perpendicular to the axis;
  • at least one tie passing through each pack of sheets perpendicular to the axis to ensure the joining of said sheets of each packet;
  • and a master plate pressed by said tie rods on each side of said plurality of packets parallel to the sheets for securing the elements of the core;
characterized by the fact that said master plate is made of a heat-conducting non-magnetic material, and said core further comprises at least one cooling tube welded to at least one of the master plates, means being further provided for connecting said at least one cooling tube to a circulation circuit of a cooling fluid.

Ainsi la tôle maîtresse, outre sa fonction traditionnelle de support mécanique, fait office de collecteur de chaleur et de radiateur, le fluide circulant dans les tubes de refroidissement emportant les calories collectées par la tôle maîtresse et assurant le maintien en température du noyau magnétique et le fonctionnement convenable de la bobine d'induction à laquelle il est destiné.Thus 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.

Dans un mode de réalisation particulier, deux tubes de refroidissement sont soudés sur chaque tôle maîtresse parallèlement à l'axe du noyau.In a particular embodiment, two cooling tubes are welded to each master plate parallel to the axis of the core.

Plus particulièrement, chaque tirant peut posséder à chacune de ses extrémités une tête dépassant de la tôle maîtresse respective, lesdites têtes étant alignées parallèlement à l'axe, les deux tubes de refroidissement étant soudés sur chaque tôle maîtresse de part et d'autre de l'alignement des têtes de tirants.More particularly, 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.

L'invention à également pour objet une bobine d'induction comprenant un circuit magnétique comportant au moins un noyau magnétique tel que décrit ci-dessus.The invention also relates to an induction coil comprising a magnetic circuit comprising at least one magnetic core as described above.

On décrira maintenant, à titre d'exemple non limitatif, un mode de réalisation de l'invention en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue en élévation, partiellement en coupe, d'une bobine d'induction triphasée selon l'invention ; et
  • la figure 2 est une vue en coupe selon la ligne II-II de la figure 1.
One embodiment of the invention will now be described, by way of nonlimiting example, with reference to the appended drawings in which:
  • the figure 1 is an elevational view, partially in section, of a three-phase induction coil according to the invention; and
  • the figure 2 is a sectional view along line II-II of the figure 1 .

On voit à la figure 1 un ensemble triphasé de trois bobines d'induction 1a, 1b et 1 c. Du circuit électrique, seul le bobinage 2 de la bobine 1 b a été représenté à titre d'exemple. L'ensemble du circuit électrique, y compris les connexions, sont de type connu et n'ont donc pas été représentés.We see at the figure 1 a three-phase assembly of three induction coils 1a, 1b and 1c. Of the electric circuit, only the winding 2 of the coil 1b has been represented by way of example. The entire electrical circuit, including the connections, are of known type and have therefore not been represented.

L'ensemble de la figure 1 comprend donc trois bobinages enroulés sur trois noyaux magnétiques, dont le bobinage 2 de la bobine 1b enroulé sur le noyau 3, ce dernier étant représenté en coupe sur la figure 2. Les trois noyaux sont, de façon habituelle, disposés parallèlement et raccordés aux éléments 4 de retour de flux du circuit magnétique.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.

Chaque noyau magnétique est composé de façon connue d'un ensemble de paquets de tôles 5 en matériau magnétique, typiquement en fer, l'un de ces paquets étant représenté en coupe axiale à la figure 2. On observera qu'un tel noyau est généralement cylindrique et comporte un axe 6. Les paquets 5 sont formés de tôles individuelles 7 dont les plans sont parallèles à l'axe 6, découpées selon différents motifs de manière que leur assemblage ait une section se rapprochant de la section circulaire de la bobine pour optimiser la circulation du flux magnétique.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.

Toutes les tôles 7 d'un même paquet 5 sont percées en leur centre d'un trou 8 dans lequel est disposé, sans contact avec les tôles, un tube 9 réalisé en matériau isolant. Un tirant 10 est engagé l'intérieur du tube 9.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.

Les différents paquets de tôles d'un noyau magnétique sont disposés les uns à la suite des autres le long de l'axe 6 du noyau, séparés par des entrefers 11, comme montré à la figure 1. Les entrefers 11 sont constitués de plaques en matériau isolant électriquement disposées perpendiculairement à l'axe 6. Le matériau isolant électriquement des entrefers 11 est également isolant thermiquement, ce qui présente l'inconvénient de favoriser un échauffement du noyau, que l'invention vise à pallier.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.

L'assemblage des paquets de tôles 5 et des entrefers 11 d'un noyau est assuré à l'aide de deux tôles maîtresses 12 en aluminium, disposées de part et d'autre du noyau, parallèlement aux tôles et à l'axe du noyau. Ces tôles 12 sont généralement rectangulaires et pressent les paquets de tôles 5 sur toute la longueur axiale du noyau. Les tôles maîtresses 12 sont percées en vis-à-vis des trous 8 des tôles de sorte qu'elles sont traversées par les tirants 10. Les tubes 9 sont en appui sur les tôles maîtresses 12 du côté des tôles 7.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.

Les tôles maîtresses 12 en aluminium assurent la conduction de la chaleur d'un paquet de tôles aux paquets adjacents, tout en prévenant la circulation des flux magnétiques.The aluminum master plates 12 ensure the heat conduction of a bundle of sheets to adjacent packets, while preventing the flow of magnetic flux.

Les tirants 10 pressent les tôles 7 par l'intermédiaire des tôles maîtresses 12. A cet effet, les tirants 10 sont en appui sur les tôles maîtresses 12 à l'aide de leurs têtes 13, par exemple des écrous vissés sur les extrémités filetées des tirants 10. Des rondelles isolantes 14 sont interposées entre les têtes 13 des tirants 10 et les tôles maîtresses 12. Les têtes 13 des tirants 10 sont généralement alignées parallèlement à l'axe 6.The tie rods 10 press the sheets 7 through the master plates 12. For this purpose, 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.

Le tube 9 et les rondelles 14 assurent l'isolation électrique du tirant 10 vis-à-vis des tôles maîtresses 12, limitant la circulation des courants induits qui pourraient provoquer un échauffement important du tirant.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.

Deux tubes de refroidissement 15 sont soudés à l'extérieur de chaque tôle maîtresse 12, du côté opposé aux tôles 7. Les tubes 15 sont ici parallèles à l'axe 6.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.

Les deux extrémités de chaque tube 15 sont munies de raccords 16 (figure 1) permettant de raccorder chaque tube à un circuit 17 de circulation de fluide de refroidissement. Une pompe non représentée est montée sur le circuit 17 pour assurer la circulation du fluide de refroidissement.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.

Les calories dégagées dans les paquets de tôles 5 sont donc collectées par les tôles maîtresses 12 et évacuées par le fluide circulant dans les tubes de refroidissement 15.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.

Claims (4)

Noyau magnétique pour bobine d'induction comprenant : - une pluralité de paquets (5) de tôles (7) en matériau magnétique séparés par des entrefers (11) en matériau isolant, lesdits paquets étant disposés les uns à la suite des autres le long d'un axe (6) du noyau avec les tôles parallèles à l'axe et les entrefers perpendiculaires à l'axe ; - au moins un tirant (12) traversant chaque paquet de tôles perpendiculairement à l'axe pour assurer la solidarisation desdites tôles de chaque paquet ; - et une tôle maîtresse (12) plaquée par lesdits tirants de chaque côté de ladite pluralité de paquets parallèlement aux tôles pour assurer la solidarisation des éléments du noyau ; caractérisé par le fait que ladite tôle maîtresse est réalisée dans un matériau amagnétique conducteur de la chaleur, et que ledit noyau comprend en outre au moins un tube de refroidissement (15) soudé sur au moins une des tôles maîtresses, des moyens (16) étant en outre prévus pour raccorder ledit au moins un tube de refroidissement à un circuit (17) de circulation d'un fluide de refroidissement.Magnetic core for induction coil comprising: a plurality of packets (5) of sheets (7) made of magnetic material separated by gaps (11) made of insulating material, said packets being arranged one after the other along an axis (6) of the core with sheets parallel to the axis and air gaps perpendicular to the axis; - At least one tie rod (12) passing through each package of sheets perpendicular to the axis to ensure the joining of said sheets of each package; - and a master plate (12) pressed by said tie rods on each side of said plurality of packets parallel to the sheets to ensure the joining of the core elements; characterized in that said master plate is made of a non-magnetic material conducting heat, and said core further comprises at least one cooling tube (15) welded to at least one of the master plates, means (16) being further provided for connecting said at least one cooling tube to a circulation circuit (17) for circulating a coolant. Noyau magnétique selon la revendication 1, comprenant deux tubes de refroidissement soudés sur chaque tôle maîtresse parallèlement à l'axe du noyau.Magnetic core according to claim 1, comprising two cooling tubes welded to each main sheet parallel to the axis of the core. Noyau magnétique selon la revendication 2, dans lequel chaque tirant possède à chacune de ses extrémités une tête (13) dépassant de la tôle maîtresse respective, lesdites têtes étant alignées parallèlement à l'axe, les deux tubes de refroidissement étant soudés sur chaque tôle maîtresse de part et d'autre de l'alignement des têtes de tirants.Magnetic core according to claim 2, wherein each tie has at each of its ends a head (13) 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 both sides of the alignment of the tie rods. Bobine d'induction, caractérisée par le fait qu'elle comprend un circuit magnétique comportant au moins un noyau magnétique selon l'une quelconque des revendications 1 à 3.Induction coil, characterized in that it comprises a magnetic circuit comprising at least one magnetic core according to any one of claims 1 to 3.
EP20080103955 2007-05-16 2008-05-14 Cooling of the magnetic core of an induction coil. Active EP1993111B1 (en)

Applications Claiming Priority (1)

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FR0755110A FR2916298B1 (en) 2007-05-16 2007-05-16 COOLING THE MAGNETIC CORE OF AN INDUCTION COIL

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EP1993111A1 true EP1993111A1 (en) 2008-11-19
EP1993111B1 EP1993111B1 (en) 2010-02-17

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Publication number Priority date Publication date Assignee Title
EP2704161A1 (en) 2012-08-31 2014-03-05 GE Energy Power Conversion Technology Ltd Magnetic core for magnetic component with winding, containing improved means of cooling

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DE602008000643D1 (en) 2010-04-01
FR2916298A1 (en) 2008-11-21
EP1993111B1 (en) 2010-02-17
FR2916298B1 (en) 2009-08-21

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