EP0124809B1 - Composant inductif - Google Patents

Composant inductif Download PDF

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Publication number
EP0124809B1
EP0124809B1 EP84104376A EP84104376A EP0124809B1 EP 0124809 B1 EP0124809 B1 EP 0124809B1 EP 84104376 A EP84104376 A EP 84104376A EP 84104376 A EP84104376 A EP 84104376A EP 0124809 B1 EP0124809 B1 EP 0124809B1
Authority
EP
European Patent Office
Prior art keywords
core
winding
inductive component
package
subpackages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84104376A
Other languages
German (de)
English (en)
Other versions
EP0124809A1 (fr
Inventor
Ejub Dipl.-Ing. Mesic
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Priority to AT84104376T priority Critical patent/ATE26361T1/de
Publication of EP0124809A1 publication Critical patent/EP0124809A1/fr
Application granted granted Critical
Publication of EP0124809B1 publication Critical patent/EP0124809B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/22—Cooling by heat conduction through solid or powdered fillings
    • 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
    • H01F27/085—Cooling by ambient air

Definitions

  • the invention relates to an inductive component according to the preamble of claim 1.
  • Such a component is known from JP-A-56.27908.
  • This component is, for example, a basic element of electrical engineering as a transformer with primary and secondary windings for converting AC voltages and currents or as a choke for smoothing pulsating DC currents.
  • y buses for example, in electric locomotives, trams or Troll, has particularly those chokes opened a great field of application, on the one hand by a large thermal capacity and stability, and on the other hand characterized by the most compact possible structure.
  • the object of the present invention is therefore to create an inductive component, the thermal load capacity of which is noticeably improved compared to the components of the known type in a manner that is easy to implement and without increasing the external dimensions.
  • the object is achieved in an inductive component of the type mentioned by the features from the characterizing part of claim 1.
  • the essence of the invention is to use the core of the inductive component for heat dissipation. Due to the close thermal contact between the winding and the core outer part, which results from the small width of the winding gap and / or its filling with a solid insulating material, the heat is transferred directly from the thermally particularly stressed coil section within the core area directly to the core and passed on to the outer surfaces due to the good thermal conductivity of the core.
  • the core serves as an additional heat store, which absorbs the winding heat that occurs during brief overloading and thus brings about a temperature compensation to subcritical values.
  • the core of the inductive component is composed as a package from transformer sheets.
  • the sheets are arranged in the stack with insulating intermediate layers because of the eddy current losses, the stack is nevertheless oriented in such a way that good heat conduction results straight from the winding outwards, perpendicular to the surface normal of the sheets.
  • the core package is divided into partial packages to increase the heat transfer area, and the partial packages are separated from one another by spacers and form cooling channels within the core. This makes it possible to Multiply heat transfer from the core to the outside space compared to the one-piece core and make the cooling more effective.
  • an inductive component according to the invention is characterized in that the core is brought into contact with a cooling medium, preferably air, over a large area and the heat generated in the winding is released to the cooling medium via the core.
  • a cooling medium preferably air
  • the large surface of the core can be used to give off heat.
  • the core 1 shows a plan view of a known inductive component with an E-I core 2 as an example.
  • the core 2, which forms a largely closed, magnetic circuit, can be subdivided into a core inner part 6 and core outer parts 7.
  • the core inner part 6 is enclosed by a winding 1, which is wound in the usual way from a wire and its number of turns on the electrical and magnetic properties of the component is matched.
  • the hatched inner winding areas 1 'of the winding 1 are in turn enclosed by the core 2, so that the heat generated in most previously known components within the winding 1 is transported to the outside and has to be released there because the core outer parts 7 one Direct cooling of the inner winding areas 1 'with a cooling medium was prevented and direct heat transfer to the outer core parts 7 was not possible due to the poor thermal contact due to a comparatively large winding gap 8 filled with air between the inner winding areas 1' and the outer core parts 7.
  • the winding 1 is in close thermal contact with the core outer parts 7. This is achieved in that the winding gap 8 is filled with a solid insulating material instead of the very poorly heat-conducting air and / or the width d of the winding gap 8 is chosen to be less than 0.5 mm. Due to the close thermal contact, the heat from the winding inner regions 1 'can be given off directly to the core outer parts 7 and, because of the good thermal conductivity of the core 2, can be dissipated to the surroundings via an outer surface.
  • winding gap 8 It is particularly advantageous to design the winding gap 8 with a width of approximately 0.2 mm, because then, on the one hand, sufficient space remains when the winding is inserted into the core so as not to endanger the insulation of the winding, and on the other hand only a little additional material for filling the winding gap must be used, which has a favorable influence on the thermal contact.
  • the winding gap 8 can be filled, for example, by the vacuum impregnation method known per se, gaps with a larger width being able to be filled with fiber mats before the impregnation.
  • FIG. 2 shows the inductive component according to FIG. 1 in a side view. It can be clearly seen how the sides of the winding 1 facing the core outer parts 7 are thermally closely coupled to the core outer parts 7 by solid contact through the filled winding gaps 8.
  • the core 2 is usually provided with an air gap 5, which serves as a parameter for determining the electrical data of the inductive component and can be used together with the parameters of the winding 1 and the core 2 to wind the winding 1 in their given core 2 Always design geometric dimensions so that there is only a small winding gap 8.
  • the core 2 is constructed as a package from a stack of transformer sheets.
  • the transformer sheets which are made of known metallic alloys with corresponding magnetic properties, have the required good thermal conductivity as metal sheets in order to be able to transport large amounts of heat without high temperature gradients. These heat transfer surfaces should be as large as possible so that the heat can then be dissipated from the core 2 via its external surfaces to the surroundings.
  • cooling channels 4 are provided in the core 2, through which a suitable cooling medium, preferably air, can pass and thereby absorb heat from the adjacent core walls.
  • the cooling channels 4 are produced by omitting smaller stacks of sheets and by assembling the remaining partial packages 21,..., 23 with corresponding spacers 3 in the spaces.
  • the cooling channels 4 have the additional advantage that the winding inner regions 1 'are at least partially flowed around directly by the cooling medium.
  • a core can be taken as an example of the dimensional relationships, the subpackages 21,..., 23 of which each have a thickness of approximately 60 mm, while the distance between the sub-packets, which is defined by the spacers 3, and thus the width of the cooling channels 4 is approximately 6 mm.
  • the improvement in the thermal load capacity, which results from the introduction of the cooling channels 4, can be expressed by the following numerical ratios: If the thermal load capacity of an inductive component with convection cooling is set at 100% via the core, this value can be achieved by forced cooling, for example can be increased to 300%. The introduction of the cooling channels 4 then brings a further increase in the load capacity to approximately 370% with a constant coolant throughput.
  • an inductive component according to the invention has the advantage that its thermal resilience is considerably increased compared to the prior art with the same external dimensions, this improvement being able to be achieved with very simple means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Burglar Alarm Systems (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Magnetic Heads (AREA)
  • Thermistors And Varistors (AREA)

Claims (2)

1. Composant inductif, en particulier bobine de self destinée à l'électronique de puissance, comprenant au moins un bobinage (1) et un noyau (2) présentant une perméabilité magnétique élevée, lequel noyau (2) est constitué essentiellement d'un métal et forme un circuit magnétique largement fermé, et se compose d'une partie interne (6) et d'une partie externe (7), dans lequel le bobinage (1) entoure la partie interne (6) du noyau et est à son tour entouré par le noyau (2), et est séparé de la partie externe (7) du noyau par un intervalle (8) d'une largeur (d) inférieure à 0,5 mm et/ou l'intervalle (8) est rempli d'un matériau isolant solide, caractérisé en ce que le noyau (2) est constitué par un assemblage de tôles de transformateur, en ce que l'assemblage est subdivisé en paquets partiels (21, ..., 23) dans le but d'accroître la surface d'échange de chaleur et en ce que les paquets partiels (21, ..., 23) sont séparés l'un de l'autre par des pièces d'écartement (3) et forment des canaux de refroidissement (4).
2. Composant inductif suivant la revendication 1, caractérisé en ce que le matériau isolant est une résine époxy renforcée par des fibres.
EP84104376A 1983-05-10 1984-04-18 Composant inductif Expired EP0124809B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84104376T ATE26361T1 (de) 1983-05-10 1984-04-18 Induktives bauelement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2547/83 1983-05-10
CH254783 1983-05-10

Publications (2)

Publication Number Publication Date
EP0124809A1 EP0124809A1 (fr) 1984-11-14
EP0124809B1 true EP0124809B1 (fr) 1987-04-01

Family

ID=4236246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104376A Expired EP0124809B1 (fr) 1983-05-10 1984-04-18 Composant inductif

Country Status (4)

Country Link
EP (1) EP0124809B1 (fr)
AT (1) ATE26361T1 (fr)
DE (1) DE3462965D1 (fr)
ES (1) ES8601555A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200616B (fr) * 1990-06-14 1993-02-21 Hujikura Densen Kk
US9524820B2 (en) * 2012-11-13 2016-12-20 Raytheon Company Apparatus and method for thermal management of magnetic devices
US9911532B2 (en) 2014-08-25 2018-03-06 Raytheon Company Forced convection liquid cooling of fluid-filled high density pulsed power capacitor with native fluid

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE381047C (de) * 1923-09-15 Bbc Brown Boveri & Cie Induktionsregler, der mittels eines angebauten Ventilators gekuehlt wird
DE131191C (fr) * 1901-07-05
CH257219A (de) * 1946-10-26 1948-09-30 Moser Glaser & Co Ag Verfahren zum Füllen von Hohlräumen von Transformatoren, und Transformator, dessen Hohlräume nach diesem Verfahren gefüllt worden sind.
GB2051491A (en) * 1979-05-16 1981-01-14 Westinghouse Canada Ltd Magnetic core for a capped core shunt reactor

Also Published As

Publication number Publication date
ES532295A0 (es) 1985-10-16
ATE26361T1 (de) 1987-04-15
DE3462965D1 (en) 1987-05-07
EP0124809A1 (fr) 1984-11-14
ES8601555A1 (es) 1985-10-16

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