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EP2711942B1 - Refroidissement d'un composant électrique - Google Patents

Refroidissement d'un composant électrique Download PDF

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Publication number
EP2711942B1
EP2711942B1 EP12185341.0A EP12185341A EP2711942B1 EP 2711942 B1 EP2711942 B1 EP 2711942B1 EP 12185341 A EP12185341 A EP 12185341A EP 2711942 B1 EP2711942 B1 EP 2711942B1
Authority
EP
European Patent Office
Prior art keywords
electrical component
heat
winding
cooling
transformer
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.)
Active
Application number
EP12185341.0A
Other languages
German (de)
English (en)
Other versions
EP2711942A1 (fr
Inventor
Peter Maisel
Matthias Hager
Martin Saliternig
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.)
Siemens AG
Original Assignee
Siemens AG
Siemens Corp
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.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP12185341.0A priority Critical patent/EP2711942B1/fr
Publication of EP2711942A1 publication Critical patent/EP2711942A1/fr
Application granted granted Critical
Publication of EP2711942B1 publication Critical patent/EP2711942B1/fr
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Anticipated expiration legal-status Critical

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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
    • H01F27/22—Cooling by heat conduction through solid or powdered fillings

Definitions

  • the invention relates to an electrical component. During operation, the electrical component heats up. For operation of the electrical component cooling may be provided.
  • the electrical component which heats up during operation, is in particular an inductive component.
  • inductive components are a coil, a transformer or a winding of an electrical machine.
  • Inductive components can heat up due to ohmic losses as well as magnetic losses. This heating can be reduced or limited by suitable cooling measures. A limitation is particularly necessary if materials of certain components of the electrical component work only up to certain temperatures and / or retain their technical properties.
  • a complete electrical component is encapsulated with the electrical component.
  • the thermally conductive potting compound allows a removal of the heat energy away from the heat source.
  • the casting takes place for example in a metallic cup or a metallic housing. Both forms a container for the potting compound.
  • the container may be mounted on a cooling plate for improved cooling.
  • the electrical component can be completely potted in a cavity of a target housing, wherein the molded cavity is available for cooling.
  • An object of the invention is to provide an alternative to the cooling of an electrical component, in which it is possible to dispense with a complete encapsulation of the electrical component.
  • the casting increases the manufacturing costs of the electrical component.
  • the potting may be a hindrance in a disassembly of the electrical component, which is particularly detrimental to a recycling of the electrical component.
  • An electrical component is in particular one which has an inductive element.
  • An inductive element is for example a coil or a winding.
  • the winding is, for example, a part of an electrical machine, in particular a motor or generator.
  • a transformer or a coil has at least one winding.
  • a coil is used as a choke coil.
  • the coil as well as the transformer can be designed as air winding, or as an electrical component having an iron core.
  • the iron core is in particular made of a laminated material and constitutes an element for guiding the magnetic flux.
  • the electrical component has, in addition to the inductive element and a heat conducting material.
  • the heat conduction material is in particular a material which is of a consistency such that it can be positioned. This means that no potting takes place.
  • a potting heat-conductive potting compound can contact parts of the electrical component thermally conductive.
  • the potting compound is initially liquid to cure thereafter. The potting compound is introduced into a cavity in a liquid state and cures there. The potting compound is not localized position, because it flows in the liquid state in cavities and is not localized before curing itself localized. The local limit is given by the cavity.
  • the inductive element has a winding or is designed as a winding.
  • the winding is, for example via the heat conducting material (this is locally self-limiting positionable) connected to a heat sink thermally conductive directly.
  • a winding has a multiplicity of heat conducting materials.
  • the winding may have a plurality of winding layers, wherein the heat conducting material is located between the winding layers.
  • the heat transport can be transported within a winding. This can be advantageously used, for example, in a winding head of an electrical machine.
  • the electrical component has an element for guiding a magnetic flux.
  • This element for guiding a magnetic flux for example, a stator core of an electrical machine, a rotor core of an electrical machine, the yoke of a transformer, an iron core of a coil, in particular a throttle.
  • the element for guiding the magnetic flux is for example directly in contact with the heat-conducting material.
  • the heat conducting material has a direct contact with a heat sink.
  • the heat sink may advantageously be designed as a housing of the electrical component.
  • this has a heat sink, wherein the heat conduction material between the heat sink and the inductive element. This improves the heat transfer between the inductive element and the heat sink.
  • this has a heat sink, wherein the heat conduction material between the heat sink and the element for guiding the magnetic flux. This improves the heat transfer between the magnetic flux guide element and the heat sink.
  • the latter has a heat sink, wherein the heat conduction material is between the heat sink and a cooling flap, wherein the cooling flap is in particular heat-conductively connected to a power semiconductor component.
  • Power semiconductors are, for example, IGBTs, MOSFETs, etc.
  • the heat conduction material is a thermal compound.
  • the thermal grease is well suited for positioning.
  • this can be designed so that at a first warming their Viscosity changed so that its creep increases.
  • the contacted surface can be increased.
  • the heat conducting material is a heat conducting foil.
  • the film is for example one-sided or double-sided self-adhesive.
  • the film may itself have or be coated with the heat-conducting material.
  • the heat conduction material is a heat conduction pad.
  • the heat-conducting pad can be self-adhesive on one or both sides.
  • the heat-conducting pad may itself have or be coated with the heat-conducting material.
  • this is a transformer.
  • the transformer has at least one winding.
  • the cooling may e.g. by pressing the magnetic core (ferrites) of the inductive component over e.g. Warmeleitpads done to a cooling plate.
  • a metal spring can be used which presses the component onto the cooling plate.
  • a connection of the electrical conductor (the winding) of the inductive component to a cooling plate for example, via a réelleleitpad, an insulating nipple, screws and / or metal dome.
  • a transformer has a magnetic core (in particular an iron core), then it can be coupled in a heat-conducting manner directly to the heat sink via the heat-conducting means.
  • the winding of the transformer has a thermally conductive direct coupling via the heat conducting means to the heat sink.
  • this is an electrical machine.
  • the electrical machine has windings. Windings are inductive elements.
  • the electric machine has a laminated core. windings and / or a laminated core are thermally conductively coupled via the heat conducting means with a heat sink.
  • the heat transfer medium can be easily placed between the heat sink and the laminated core. It is just as simple with a transformer in which the heat conduction between iron core and heat sink is positioned.
  • the heat-conducting centers are then pressed in between correspondingly, so that contact with a large surface can form. This method is simpler, faster and / or less expensive compared to a grout.
  • this is a coil.
  • the coil is used, for example, as a reactor.
  • the throttle has an iron core, wherein the coil similar to the transformer or the electric machine, the heat conduction between the heat sink and winding or iron core, as an element for guiding a magnetic flux having.
  • pillows of a specific thickness or with a specific property are used as heat-conducting means.
  • Such pillows are also referred to as a pad.
  • the thermal pad has, for example, a thickness of about 0.23 mm and a lambda value of about 1.8 W / mK. It is also possible to use thicker heat-conducting cushions, which can advantageously also have a damping effect against vibrations.
  • Such a pad may have a thickness of about 0.38 mm and a lambda value of about 1 W / mK. With the same lambda value, much thinner heat-conducting pads with a thickness of approx. 0.15 mm can also be used.
  • a further possibility for improving the cooling of an electrical component results from a combination of the stated use of heat conducting material with the use of highly thermally conductive plastics in the production of a wound body for a winding.
  • a critical process in production namely the (sometimes repeated) potting of a component can be omitted.
  • high costs for maintenance-intensive production equipment (potting systems) can be saved.
  • the omission of the potting process shortens the throughput times in production, which leads to renewed cost reduction.
  • the cooled area can be substantially increased, resulting in a marked reduction in thermal resistance (e.g., doubling the area and halving the thermal resistance).
  • the element for guiding the magnetic flux (in particular a ferrite core), cooling flanges, a winding and / or a winding body may be coupled in heat-conducting manner on opposite sides, so that a multi-sided cooling arrangement results.
  • cooling flanges can have more cooling surface due to the omission of fastening bores.
  • the size of the inductive elements can be reduced, resulting in a saving of magn.
  • Material leads the magnetic flux
  • conductor material can result.
  • a smaller inductive element also means that the devices equipped with it can also be made smaller. This is particularly advantageous in vehicle construction or in aircraft construction.
  • the electrical component is thus used for example in a car which has an electric drive.
  • all springs, screws or other materials that the attachment serve the inductive element omitted, since both a thermal and a mechanical connection is realized by a sandwich cooling, ie a pressing of the inductive element between two parts of a heat sink, serving as an intermediate layer of a heat conducting material.
  • Magnet cores for transformers, chokes, etc. are advantageously ground at least on the surfaces to which they are joined together. As a result, the tolerance in this spatial direction can be maintained or determined relatively accurately.
  • a narrow tolerance band of all surfaces is often only possible by means of subsequent processing (for example grinding), which, however, has a negative effect on the cost of the part.
  • the cooling with the heat conducting material acts on these principally relatively imprecisely manufactured surfaces, being compensated by the heat conducting material manufacturing tolerances.
  • the heat conduction material is therefore on a surface which is not abraded compared to other surfaces and / or has higher manufacturing tolerances than other surfaces of the respective component.
  • the representation according to FIG. 1 schematically shows a transformer 1.
  • the transformer 1 is an electrical component, in particular an inductive power device.
  • the transformer 1 comprises a magnetic core material (eg, a ferrite).
  • the magnetic core material constitutes an element for guiding a magnetic flux.
  • the transformer 1 has a winding 2.
  • the winding 2 is an inductive element, wherein the winding can be formed with and without winding body.
  • the transformer 1 also has power terminals 7.
  • a sectional view along a line II-II is in FIG. 2 shown. This sectional view is used for a more detailed explanation of the cooling principle as well as the fastening principle. These principles are shown by way of example only on a transformer, but are also transferable eg to an electric machine or a throttle.
  • the representation according to FIG. 2 shows the transformer 1.
  • the transformer 1 has a first housing part 9 and a second housing part 10. Between the two housing parts 9 and 10 are the active parts of the transformer 1.
  • the ferrite core 4 is positioned as an element for guiding the magnetic flux between the parts 9 and 10 of the housing.
  • Such a heat conducting material 3 is also located between the second housing part 10 and the ferrite core 4. This results in a kind of sandwich cooling, since the ferrite core is located between two housing parts and with these on the planteleitmaterialien 3 in thermally conductive contact.
  • the housing with the first housing part 9 and the second housing part 10 is a heat sink, the two heat sink parts 9 and 10th having.
  • the heat conduction material 3 is clamped in particular between the ferrite core 4 and the respective housing parts 9 and 10.
  • the heat-conducting material 3 is, for example, heat-conducting pads, which in particular are glued to at least one of the adjacent parts.
  • the sauceleitmaterial 3 is after FIG. 2 Also positioned between the inductive element 2, so the winding, and the first and second housing part 9 and 10 respectively. This also results in a kind of sandwich cooling.
  • the heat transfer can take place both via the ferrite core 4 and via the winding 2 and / or via a winding body.
  • the heat removal is a large area available, even if a bobbin is included.
  • the heat-conducting material 3 is, for example, a highly heat-conductive soft silicone, a highly thermally conductive thermosilicone, a thermally conductive silicone-free film, a silicone-free phase change film (phase change film) or the like.
  • inductive power components often also require mechanical fastening, they can be fastened with clips, screws, etc.
  • FIG. 1 It can be seen that no further fastenings are necessary here, because the transformer, almost as in a potting compound (see FIG. 2 ) is embedded.
  • both a fixation of the winding body or the winding, as well as the magnetic core (ferrite core) guaranteed.
  • the inductive element 2 with the element for guiding the magnetic flux 4 in a direction 11 is not fixed, that is loosely connected.
  • the inductive element 2 within the ferrite core 4 at least in such a way be movable, that a manufacturing tolerance of the housing parts 9 and 10 is compensated.
  • thermally conductive materials eg: banksleitpads
  • a further increase in heat dissipation can be achieved by additional layers of thermally conductive materials 3 between the winding layers 12.
  • a continuous heat conduction from the inner of the inductive element 4 (winding) is constructed to the heat sink.
  • FIG. 3 shows as already described a transformer 1, which has 2 layers of heat conducting material 3 in the winding.
  • a section IV through the transformer 1 gives the representation after FIG. 4 , Here, several layers of heat conducting material 3 and winding layers 12 are shown alternately.
  • the cooling can also be improved by a thermal coupling of the winding body 13 to the housing.
  • FIG. 5 shows a further section VI through the transformer 1. This section is in FIG. 6 shown. It is shown that there is also between the inductive element 2 (winding) and the element for guiding the magnetic flux 4 (ferrite core) 3 bathleitmaterial.
  • the heat-conducting material 4 is, for example, a pad which extends beyond the element 4, so that, for example, it can also contact a heat sink.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (6)

  1. Composant ( 1 ) électrique, qui a un élément ( 2 ) inductif et un matériau ( 3 ) conducteur de la chaleur, le matériau ( 3 ) conducteur de la chaleur pouvant être mis en position localement de manière limitée, le composant ( 1 ) électrique ayant un élément ( 4 ) de guidage d'un flux magnétique, caractérisé en ce que le composant ( 1 ) électrique a une première partie ( 9 ) de refroidisseur et une deuxième partie ( 10 ) de refroidisseur,
    dans lequel le matériau ( 3 ) conducteur de la chaleur:
    - est entre les parties ( 9, 10 ) de refroidisseur et l'élément ( 2 ) inductif et est entre les parties ( 9, 10 ) de refroidisseur et l'éléments ( 4 ), pour guider le flux magnétique,
    dans lequel le matériau ( 3 ) conducteur de la chaleur est une pâte conductrice de la chaleur, une feuille conductrice de la chaleur et/ou un coussin conducteur de la chaleur.
  2. Composant ( 1 ) électrique suivant la revendication 1, dans lequel l'élément ( 2 ) inductif est un enroulement.
  3. Composant ( 1 ) électrique suivant la revendication 2, dans lequel l'enroulement a une pluralité de matériaux ( 3 ) conducteurs de la chaleur.
  4. Composant ( 1 ) électrique suivant l'une des revendications 1 à 3, dans lequel le composant ( 1 ) électrique est un transformateur.
  5. Composant ( 1 ) électrique suivant l'une des revendications 1 à 3, dans lequel le composant ( 1 ) électrique est une machine électrique.
  6. Composant ( 1 ) électrique suivant l'une des revendications 1 à 3, dans lequel le composant ( 1 ) électrique est une bobine.
EP12185341.0A 2012-09-21 2012-09-21 Refroidissement d'un composant électrique Active EP2711942B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12185341.0A EP2711942B1 (fr) 2012-09-21 2012-09-21 Refroidissement d'un composant électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12185341.0A EP2711942B1 (fr) 2012-09-21 2012-09-21 Refroidissement d'un composant électrique

Publications (2)

Publication Number Publication Date
EP2711942A1 EP2711942A1 (fr) 2014-03-26
EP2711942B1 true EP2711942B1 (fr) 2016-12-28

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EP12185341.0A Active EP2711942B1 (fr) 2012-09-21 2012-09-21 Refroidissement d'un composant électrique

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013208653A1 (de) * 2013-05-10 2014-11-13 Sts Spezial-Transformatoren-Stockach Gmbh & Co. Kg Induktives Bauteil
DE202015104205U1 (de) 2015-08-11 2016-11-14 Tridonic Gmbh & Co Kg Induktivität mit lokaler Kühlung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6705388B1 (en) * 1997-11-10 2004-03-16 Parker-Hannifin Corporation Non-electrically conductive thermal dissipator for electronic components
US8203411B2 (en) * 2004-06-17 2012-06-19 Maclennan Grant A Potted inductor apparatus and method of use thereof
US7369024B2 (en) * 2004-08-10 2008-05-06 Crompton Greaves Limited Compact dry transformer
US7164584B2 (en) * 2004-10-19 2007-01-16 Honeywell International Inc. Modular heatsink, electromagnetic device incorporating a modular heatsink and method of cooling an electromagnetic device using a modular heatsink
US20070166554A1 (en) * 2006-01-18 2007-07-19 Ruchert Brian D Thermal interconnect and interface systems, methods of production and uses thereof
FI20096045A (fi) * 2009-10-09 2011-04-10 Jarkko Salomaeki Induktiivisen komponentin käämijärjestely
JP4654317B1 (ja) * 2009-07-16 2011-03-16 株式会社神戸製鋼所 リアクトル

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
EP2711942A1 (fr) 2014-03-26

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