EP1772877A1 - Transformateur MF avec meilleure dissipation thermique - Google Patents

Transformateur MF avec meilleure dissipation thermique Download PDF

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Publication number
EP1772877A1
EP1772877A1 EP06011057A EP06011057A EP1772877A1 EP 1772877 A1 EP1772877 A1 EP 1772877A1 EP 06011057 A EP06011057 A EP 06011057A EP 06011057 A EP06011057 A EP 06011057A EP 1772877 A1 EP1772877 A1 EP 1772877A1
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EP
European Patent Office
Prior art keywords
insulation
inductive component
winding
component according
heat
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
EP06011057A
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German (de)
English (en)
Other versions
EP1772877B1 (fr
Inventor
Christof C Gulden
Wilhelm Krämer
Ulrich Kleineidam
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.)
Sts Spezial-Transformatoren-Stockach & Co KG GmbH
Original Assignee
Sts Spezial-Transformatoren-Stockach & Co KG GmbH
Priority date (The priority date 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 date listed.)
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Publication of EP1772877A1 publication Critical patent/EP1772877A1/fr
Application granted granted Critical
Publication of EP1772877B1 publication Critical patent/EP1772877B1/fr
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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support

Definitions

  • the invention relates to an inductive component, such as a transformer or a choke, but in particular a medium-frequency transformer (MF transformers) with galvanic isolation, as used for example for applications in the field of railway technology and industry.
  • MF transformers medium-frequency transformer
  • Transformers and chokes are essential components in electrical engineering, in industrial plant construction, in rail vehicle construction and generally in many areas of technology (including airplanes / satellites). Nevertheless, power compression has been realized in the design of transformers and chokes in the past to a limited extent. For example, known rectangular and cylindrical designs have a power to weight ratio of about 0.4-0.6 g / W at 6-12 KHz with a transmission power between 30 and 50 KVA.
  • MF transformers as well as other transformers and chokes for industrial and rail transport, are traditionally cooled only at the winding or at gaps with air or other media.
  • the reason for this is the problem of how the resulting heat loss can be dissipated into the atmosphere.
  • the heat dissipation is greatly hindered by the thermal resistances of the interlayer and coil insulation, especially in the mid-interior areas of the windings, resulting in high temperatures.
  • the classes of insulation limit the currents of the transformers by fixed maximum temperatures of insulating materials, although in most cases higher Controllers of the magnetic circuit and thus higher currents and powers would be possible.
  • the conductor cross section and / or the core cross section must be increased, also because the functional curves of the magnetic materials (inter alia induction) deteriorate at high temperatures, ie. H.
  • the core cross-sections usually have to be significantly increased, which in turn leads to higher losses due to the larger windings (longer winding lengths).
  • HBU rail technology - auxiliary converter converters
  • the slow development of transformers and chokes becomes clear in two ways.
  • the development of power electronics, semiconductors, and passive magnetic components is increasingly falling apart in terms of weight and volume. Ie. the significant reduction of the HBU or drive converter modules also does not have a desirable dynamic equivalent in the magnetic components.
  • the invention has for its object, in power transformers and reactors, especially MF transformers, a power compression, at least by a factor of 1.5 to achieve. That is, the MF transformers or chokes according to the invention have compared to conventional MF transformers, with the same volume and weight, at least a factor of 1.5 greater performance, or at the same power a significantly lower volume and weight
  • the invention solves the problem of difficult heat transmission through the conductor insulations, or in the case of reflow / pouring of the windings through most of the insulating surfaces of the transformers or reactors.
  • newly developed shall be used, which have a better thermal conductivity by a factor of 5-20 than the previously used insulation materials, and it is galvanically isolating test voltage safe thermal bridges used, which derive the heat loss much more effective from thermal focus.
  • thermal bridge intermediate insulations are newly developed, which substantially improve the heat dissipation from the inner layers of the windings to the outer layers and to the transformer surface and make the use of auxiliary coolers arranged there with low volume very effective.
  • the invention is based on a novel concept for the conductor and intermediate insulations by use of windable aluminum nitride (AIN) or aluminum oxide-based low-plastic heat-conducting insulating films to reduce the thermal resistance between the film turns and layers by a factor of 3-10 To significantly reduce the weight and volume of the windings, so that the magnetic circuits of the transformers - in particular width and / or height of the winding - can be significantly reduced.
  • AIN windable aluminum nitride
  • AIN aluminum oxide-based low-plastic heat-conducting insulating films
  • the primary and secondary windings are preferably separated from each other by intermediate insulation and a hermetic encapsulation, the cores being thermally and electrically insulated in respective spool penetrations in the coil encapsulation.
  • the Spulenumguß is preferably a primary and secondary winding hermetically sealed and separated from each other potting compound. This forms together with the windings a compact block for receiving the cores.
  • the potting compound is preferably in turn composed of a resin, preferably epoxy resin with thermally conductive fillers, preferably aluminum nitrite and / or silanized quartz powder and / or isolated metal particles, as far as the casting insulation properties are not affected thereby.
  • the invention is not limited to encapsulated or encapsulated coils / windings.
  • the thermal bridge intermediate insulation and thermal bridges Windungsisolation can also be used for conventional transformers without
  • the primary and secondary windings of the transformers and chokes are preferably foil conductors, but may also be designed as a high-frequency strand and / or profile waveguide (for direct / indirect liquid cooling).
  • impregnation of windings can also be provided with heat-conducting additives according to the invention so that the impregnation can penetrate into the many fine gaps in order to bridge the not insignificant gap heat resistances.
  • Figures 1 and 2 show a molded MF transformer with a winding 50 which is surrounded by an encirclement 51.
  • flexible thermal bridges 52 are provided, which consist for example of flexible shallleitfolien of windable aluminum nitride or aluminum oxide.
  • ceramic thermal bridges 53 are provided in the interior of the winding, as well as ceramic thermal bridges 54 as Outdoor cooler or as a connection to outdoor coolers. These designs of the thermal bridges are rigid and must therefore be adapted constructively to the winding shapes. But they have in comparison to the flexible thermal bridges significantly higher thermal conductivity.
  • Figures 1 a and 2a show (compared to Figures 1, 2, 3, 4) a so-called pot transformer.
  • the outer and inner contours of the winding are with politiciansleitkachel 54; 53 or provided with flexible thermal bridges 66 which are spatok coupled to the pot housing to low-gap and cast together with the cores 69.
  • Figures 1-4 illustrate windings for transformers in encapsulation and non-encapsulation technology, i. Applications without pot housing dar.
  • the sprue of the winding and the cores takes place in pot housings according to Figures 1a and 2b.
  • the winding equipped with thermal bridges as in 1 and 2.
  • winding and cores are thermally (thermally conductive) contacted with the thermal bridges 54 and or 51 on the pot housing 66.
  • the heat losses of the cores / yokes are dissipated via heat conducting lugs or special molded parts to the housing, which can be equipped with and without cooling ribs 70.
  • Figures 3 and 4 show a comparison with Figures 1 and 2 modified embodiment of a transformer, between each winding layer 50 flexible thermal bridges 52, which also serve as insulation, as well as ceramic thermal bridges 53 are provided, which effectively reduces the heat generated in winding 50 heat loss lead outside.
  • FIGs 5, 6 and 7 show various possibilities of building solid thermal bridges, such as ceramic thermal bridges 53 and 54, according to Figures 5 and 7.
  • These thermal bridges 53 and 54 are in their shape - as mentioned - adapted to the particular application.
  • the thermal bridge according to FIG. 5 is arranged, for example, between the layers of a winding, while the thermal bridge according to FIG. 7 can represent a thermal bridge for external cooling.
  • Figure 6 shows a thermal bridge 61 consisting of an injection molding, casting, or sintered material, which is very cheap and easy to manufacture.
  • the injection-molding material preferably contains additives of very good heat-conductive materials.
  • FIGS. 8 to 13 show MF transformers with thermal bridges, in particular internal thermal bridges 58 between the winding layers and outer thermal bridges 57, which are connected to further thermal bridges 59 and cooling lugs 55 for dissipating the heat to the atmosphere.
  • the radiator lugs are realized, for example, by a heat conduction plate 56, as shown in FIG.
  • the entire winding region of the transformer is surrounded for example by an epoxy encapsulation 60, which may also consist of good thermal conductivity material but need not.
  • FIGS 14 to 17 show another embodiment of the medium-frequency transformer according to the invention in different views.
  • the MF transformer has a Spulenumguß 1 with a substantially chamfered-rectangular cross section.
  • a primary winding 2a and a secondary winding 2b are cast. This results in a windings 2a, 2b hermetically enclosing block.
  • the front and the back form an end face 3, the z. B. for positioning the terminals 13, 14 of the MF transformer can be used.
  • At the bottom End transformer feet 4 are preferably provided, which have a sprue fitting 6 for floor or wall mounts.
  • a flexible intermediate insulation 7 is provided, which also serves as a thermal bridge between the winding layers, so that the loss heat generated in the windings is immediately transported in the direction of the cores or to the outside.
  • the coil encapsulation 1 for example, two three-layer windings 2a and 2b are inserted, wherein the windings are juxtaposed by a Isolier fundamentalguß 19 separated from each other.
  • 20 cavities 20 can be provided on the front and back 3 of the Spulenumgußes, which provide better dissipation of heat from the coils 2a, 2b to the outside in the environment.
  • the electrical connection of the windings 2a and 2b takes place in integrated boarding rooms 11 and 12, which are also fully filled with potting compound.
  • each coil has a coil penetration, wherein the coil penetrations are arranged plane-parallel to each other.
  • the coil penetrations have, for example, a rectangular cross-section, with bevelled areas on the narrow sides of the penetration, wherein in each case ribs 9 arranged parallel to one another are provided on one longitudinal side of the rectangle.
  • the ribs 9 to the surfaces of the coil penetration are arranged plane-parallel.
  • the ribs 9 are preferably longitudinally conically shaped, both laterally and in their breakthrough width.
  • the cores 21, 22 and yokes 18, as indicated in FIGS. 20 and 21, are joined into assemblies from I-cores or ribbon cores.
  • the cores 21, 22 or yokes 18 are then externally and in the region of the adhesive joints to the ribs 9 of the Spulenumgußes 1 with a thermal insulating layer 5, preferably glued GfK. This ensures that the cores 21, 22 of the Windings 2a, 2b can be thermally decoupled.
  • These pasted with the insulating layer 5 cores 21, 22 are now fixed on one side by gluing to the ribs 9.
  • the cores 21, 22 thus have contact only with the coil encapsulation 1 in the region of the ribs 9.
  • no mechanical supporting or clamping elements are required for the cores 21, 22 and yokes 18, since the cores lie directly on the ribs 9 within the coil penetrations be applied.
  • the cores 21, 22 are freely suspended in the windings on all sides and attached to the ribs 9 on only one side. As a result, the cores 21, 22 held in the Spulenumguß 1 due to the bond "elastic-solid" and very quiet. All parts for fixing the cores 21, 22 are made of non-conductive materials, so that the cores can float freely in terms of potential.
  • the cores are not grounded in contrast to conventional transformers. Preference is given to using ferrite cores or nanocrystalline or amorphous cores.
  • Figures 18 and 19 show a slightly modified embodiment of an MF transformer according to the invention, in which case somewhat narrower ribs 9 are used for fastening the cores 21, 22.
  • the transformer can be optimized either in terms of its leakage inductance or its noise emission.
  • intermediate thermal bridging insulations 7 are used between the layers of windings 2a and 2b.
  • Figures 22 to 26 show a transformer with thermal bridges and base surfaces for internal and external cooling.
  • the transformer comprises both outer cooling plates 25 and inner cooling plates 26, which have corresponding ones Thermal bridge contacts 27 are thermally conductively connected to the windings 2a and 2b, respectively.
  • the windings are, as described above, separated from each other by intermediate thermal insulation 7.
  • the cooling plates 25 and 26 are fixed for example by means of an undercut 28 in the casting resin of the transformer.
  • the cooling plates 25 and 26 may have corresponding screw thread 29 to which then additional cooling elements can be screwed.
  • FIGS. 27 to 30 show the transformer according to FIGS. 22 to 26 with external cooling elements 30 and 31 which are fastened, preferably screwed, to the cooling plates 25 and 26.
  • the cooling element 31 has, for example, a number of cooling webs 32, between which cooling chimneys 33 form, which ensure good heat dissipation by air circulation. That The coolers have the task of compensating either by the area reduction of the transformers, which is accompanied by the volume reduction, or the increased power loss, which takes place with the possible power increase.
  • FIGS. 31 and 32 show, by way of example, a cross section and a top view of one of the two windings 2a and 2b, for example, of the transformers according to FIGS. 14 and 22.
  • the conductors are preferably copper foil conductors 23, which are substantially square with the interposition of an intermediate insulation 24 or rectangular wound.
  • the Cu conductors 23 are externally connected in the terminals 13, 14 of the Spulenumgußes 1.
  • the windings are firmly and hermetically sealed with a potting compound of a resin, preferably epoxy resin, with thermally conductive fillers, but it need not be in conventional transformers.
  • the windings can also be wrapped with a coarse-meshed glass silk tape, so that the Wicklungsumguß is highly stable, heat and cold shock resistant.
  • the conventional mica insulation is replaced according to the invention by thermal bridges 34 and cast-resin intermediate insulating 7.
  • the magnetic cores are provided with thin GfK plates for stress compensation and as adhesion promoter. Furthermore, side recesses 16 remain for the air bubble rise to the middle or outside for the process improvement during the casting process of the windings.
  • FIG. 33 shows, starting from the example of FIGS. 31 and 32, the production of a winding with thermal bridges, wherein the individual parts of the windings are connected to one another in a heat-conducting manner by thermal bridges 34 and 34a.
  • Figures 34 and 35 show a further embodiment of a transformer with thermal bridges in the form of a pot transformer.
  • thermal bridge insulation for example made of aluminum nitride, and cast intermediate insulations 38.
  • internal thermal bridges 36 and outer thermal bridges 44 are provided, the internal thermal bridges 36, the heat between the winding bearings 35 derived and to the outer Give thermal bridges 44, which then deliver it to inner-outer heat conductor 39, which are connected to a corresponding cooling element 41.
  • the cooling element 41 is preferably integrated in the pot housing 40 of the transformer.
  • FIGS. 36 and 37 show a similar exemplary embodiment to FIGS. 34 and 35, wherein heatpipes 43 connected to the inner thermal bridges 36 are additionally provided here, which absorb the heat generated in the interior of the winding 35 and release it to the cooling elements 41 to the outside.
  • Figures 38 and 39 show possibilities of heat dissipation and heat dissipation from the interior of the transformer to the heat pipe 43.
  • ® Windungs- and intermediate insulation 47 made of insulating réelleleitmaterial to transfer the heat to a planteleitfahne the heat pipe.
  • the heat is passed through a ceramic strip 48 to the heat pipe 43 and with a metal rail part, such as copper 49, evenly transferred to the heat pipe 43.
  • FIG. 40 shows an example of a transformer with thermal bridges and conductive heat pipe to an external cooling element 45.
  • the heat generated in the interior of the transformer is conducted via the heat pipes 43 to the external cooling element 45, which is cooled by a cooling air flow 46.
  • the external cooling element may, for example, be located in a separate room which is separated from the space of the transformer by a bulkhead wall.
  • FIGS. 41 and 42 show, by way of example, a disk throttle for railway or industrial applications.
  • the schematic diagrams show how, in the sense of the invention, basically the windings of transformers and reactors are traversed.
  • the windings 80 of the choke coil for example, consist of a foil conductor, high-frequency strand or a waveguide.
  • the windings 80 are electrically insulated from each other by thermal bridge insulation 76.
  • thermal bridge insulation 76 Between the outer diameter of the winding and the throttle jacket thermal bridges 75 are provided, as well as thermal bridges 76 between the core and the inner diameter of the coil.
  • the potting 82 of the disc choke is preferably made of thermally conductive resins, with a specific thermal conductivity of, for example, greater than 1.6 W / m K.
  • the core 78 and the disc (yoke) 79 consist for example of powder composite materials or other soft magnetic materials.
  • thermally conductive winding insulation 81 may be provided.
  • the electrical connections 83 of the throttle are designed as a passage through the disk housing.
  • an impregnating varnish 84 or impregnating varnish application 85 can be used which has been enriched with heat-conducting powder of different grain size.
  • the pos. 75 in Figure 43 symbolizes a conventional insulation of the windings 80.
  • the pos 81 a, 81 b and 81 c in Figures 44, 45 and 46 show the forced thermal bridge technique between conductors, be it high-voltage stranded wire or other conductors, where It should be noted that the winding insulation, with the relatively small differences in voltage between adjacent windings, allows foils with high and special addition of heat conducting materials up to a specific thermal conductivity of currently 8-10 W / m K (the development continues to even higher thermal conductivities, is included by definition and according to the invention)
  • the cover layers of an intermediate insulation of previous insulating z. B. mica polyamide, etc. to wrap and to wrap the main strength of the intermediate insulation of thermal bridging films, which increases the overall thermal resistance but only slightly because of the proportional layer thickness ratios, however, has the advantage of decades in Trafobau proven materials to place directly where the voltage stress on the Intermediate insulation is highest.
  • the inner winding insulation (the inner layers) can be made with “thermal bridge insulation” 81, while z. B. "outer Windungsisolationen” often can be made from conventional Windungsisolationen.
  • Windings with impregnations which have better heat-conducting properties than previous impregnations, are optimally completed.
  • the impregnations 84, 85 can, similar to the thermal bridging films, be enriched with varnishleitpulvern, which means a better overall heat engineering design of MF transformers and chokes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Thin Magnetic Films (AREA)
  • Insulating Of Coils (AREA)
  • Non-Reversible Transmitting Devices (AREA)
  • Transformer Cooling (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Insulated Conductors (AREA)
EP06011057A 2005-06-02 2006-05-30 Transformateur MF avec meilleure dissipation thermique Active EP1772877B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202005008757U DE202005008757U1 (de) 2005-06-02 2005-06-02 Transformator

Publications (2)

Publication Number Publication Date
EP1772877A1 true EP1772877A1 (fr) 2007-04-11
EP1772877B1 EP1772877B1 (fr) 2009-12-09

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EP06010808A Active EP1729310B1 (fr) 2005-06-02 2006-05-26 Transformateur MF
EP06011057A Active EP1772877B1 (fr) 2005-06-02 2006-05-30 Transformateur MF avec meilleure dissipation thermique

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EP (2) EP1729310B1 (fr)
AT (2) ATE381766T1 (fr)
DE (3) DE202005008757U1 (fr)
DK (2) DK1729310T3 (fr)
ES (2) ES2299118T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2684202A2 (fr) * 2011-03-11 2014-01-15 Reo Train Technologies GmbH Composant électrique comportant au moins une source de dissipation de puissance électrique disposée dans un matériau d'enrobage et un dispositif de refroidissement
DE102013105120A1 (de) * 2013-05-17 2014-11-20 Reo Inductive Components Ag Elektrische und induktive Bauteile
US11557428B2 (en) 2017-02-17 2023-01-17 Hitachi Energy Switzerland Ag Medium-frequency transformer with dry core

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10356978A1 (de) * 2003-12-05 2005-07-14 Bosch Rexroth Ag Modul einer Widerstandsschweißzange
DE102013208653A1 (de) 2013-05-10 2014-11-13 Sts Spezial-Transformatoren-Stockach Gmbh & Co. Kg Induktives Bauteil
KR20200014834A (ko) * 2017-05-29 2020-02-11 신 에너지 리미티드. 초박형 변압기 그 생산 방법
PL73320Y1 (pl) 2021-09-30 2024-01-29 Abb Schweiz Ag Obudowa elementów magnetycznych
EP4167255A1 (fr) 2021-10-14 2023-04-19 Premo, S.A. Bobine conductrice de chaleur pour une unité d'alimentation magnétique

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EP0287814A1 (fr) * 1987-03-24 1988-10-26 Asea Brown Boveri Ab Matière électro-isolante comprenant une couche d'un polymère organique
DE9211601U1 (fr) * 1991-08-30 1992-10-22 Tridonic-Bauelemente Gmbh, Dornbirn, At
EP0540958A1 (fr) * 1991-11-02 1993-05-12 Asea Brown Boveri Ag Inductance toroidale
EP0882574A1 (fr) * 1995-12-28 1998-12-09 Dupont Teijin Advanced Papers Ltd. Feuille composite et son procede de fabrication
EP1114807A1 (fr) * 1999-06-14 2001-07-11 Sumitomo Electric Industries, Ltd. Materiau composite et dispositif a semi-conducteur comprenant celui-ci
DE10203246A1 (de) * 2002-01-21 2003-08-21 Bombardier Transp Gmbh Mittelfrequenz-Transformator
EP1422983A2 (fr) * 2002-10-14 2004-05-26 IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH Boítier plastique résistant à l'usure, conduisant et rayonnant la chaleur, pourvu de nervures de renfort et d'un radiateur surmoulé pour le refroidissement, procédé de fabrication de ce boítier
US20040105664A1 (en) * 2002-12-03 2004-06-03 Mladen Ivankovic Linear electric motor controller and system for providing linear speed control
EP1489113A1 (fr) * 2002-03-14 2004-12-22 Daikin Industries, Ltd. Fluorocopolymere, procede de production de fluorocopolymere, composition de fluorocopolymere durcissable et objet durcissable
EP1530223A1 (fr) * 2002-07-04 2005-05-11 Kabushiki Kaisha Toshiba Element isolant a conductivite thermique elevee et son procede de fabrication, bobine electromagnetique et dispositif electromagnetique

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FR1325184A (fr) * 1962-04-26 1963-04-26 Landis & Gyr Sa Corps de bobine
JP4026128B2 (ja) * 2002-08-22 2007-12-26 ミネベア株式会社 コイル用ボビン

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5875818A (ja) * 1981-10-30 1983-05-07 Toshiba Corp 箔巻巻体
DE3539737A1 (de) * 1985-11-08 1987-05-21 Transformatoren Union Ag Wicklung fuer transformatoren und drosselspulen
EP0287814A1 (fr) * 1987-03-24 1988-10-26 Asea Brown Boveri Ab Matière électro-isolante comprenant une couche d'un polymère organique
DE9211601U1 (fr) * 1991-08-30 1992-10-22 Tridonic-Bauelemente Gmbh, Dornbirn, At
EP0540958A1 (fr) * 1991-11-02 1993-05-12 Asea Brown Boveri Ag Inductance toroidale
EP0882574A1 (fr) * 1995-12-28 1998-12-09 Dupont Teijin Advanced Papers Ltd. Feuille composite et son procede de fabrication
EP1114807A1 (fr) * 1999-06-14 2001-07-11 Sumitomo Electric Industries, Ltd. Materiau composite et dispositif a semi-conducteur comprenant celui-ci
DE10203246A1 (de) * 2002-01-21 2003-08-21 Bombardier Transp Gmbh Mittelfrequenz-Transformator
DE10203246B4 (de) 2002-01-21 2004-01-29 Bombardier Transportation Gmbh Mittelfrequenz-Transformator
EP1489113A1 (fr) * 2002-03-14 2004-12-22 Daikin Industries, Ltd. Fluorocopolymere, procede de production de fluorocopolymere, composition de fluorocopolymere durcissable et objet durcissable
EP1530223A1 (fr) * 2002-07-04 2005-05-11 Kabushiki Kaisha Toshiba Element isolant a conductivite thermique elevee et son procede de fabrication, bobine electromagnetique et dispositif electromagnetique
EP1422983A2 (fr) * 2002-10-14 2004-05-26 IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH Boítier plastique résistant à l'usure, conduisant et rayonnant la chaleur, pourvu de nervures de renfort et d'un radiateur surmoulé pour le refroidissement, procédé de fabrication de ce boítier
US20040105664A1 (en) * 2002-12-03 2004-06-03 Mladen Ivankovic Linear electric motor controller and system for providing linear speed control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2684202A2 (fr) * 2011-03-11 2014-01-15 Reo Train Technologies GmbH Composant électrique comportant au moins une source de dissipation de puissance électrique disposée dans un matériau d'enrobage et un dispositif de refroidissement
DE102011013684B4 (de) 2011-03-11 2019-09-12 Reo Ag Elektrisches Bauteil mit wenigstens einer in einer Vergussmasse angeordneten elektrischen Verlustleistungsquelle und einer Kühleinrichtung
DE102013105120A1 (de) * 2013-05-17 2014-11-20 Reo Inductive Components Ag Elektrische und induktive Bauteile
DE102013105120B4 (de) 2013-05-17 2019-09-26 Reo Inductive Components Ag Elektrische und induktive Bauteile
US11557428B2 (en) 2017-02-17 2023-01-17 Hitachi Energy Switzerland Ag Medium-frequency transformer with dry core

Also Published As

Publication number Publication date
DE202005008757U1 (de) 2006-10-12
DE502006005568D1 (de) 2010-01-21
DK1729310T3 (da) 2008-05-05
ATE381766T1 (de) 2008-01-15
EP1772877B1 (fr) 2009-12-09
ES2337279T3 (es) 2010-04-22
DK1772877T3 (da) 2010-04-26
ES2299118T3 (es) 2008-05-16
DE502006000228D1 (de) 2008-01-31
EP1729310A1 (fr) 2006-12-06
ATE451703T1 (de) 2009-12-15
EP1729310B1 (fr) 2007-12-19

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