EP0254132B1 - Dispositif pour ballast ou transformateur améliorant le refroidissement - Google Patents

Dispositif pour ballast ou transformateur améliorant le refroidissement Download PDF

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Publication number
EP0254132B1
EP0254132B1 EP87109829A EP87109829A EP0254132B1 EP 0254132 B1 EP0254132 B1 EP 0254132B1 EP 87109829 A EP87109829 A EP 87109829A EP 87109829 A EP87109829 A EP 87109829A EP 0254132 B1 EP0254132 B1 EP 0254132B1
Authority
EP
European Patent Office
Prior art keywords
shell
winding
core sheet
sheet pack
ballast
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 - Lifetime
Application number
EP87109829A
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German (de)
English (en)
Other versions
EP0254132A1 (fr
Inventor
Lilja Pertti
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.)
Helvar Oy AB
Original Assignee
Helvar Oy AB
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 Helvar Oy AB filed Critical Helvar Oy AB
Publication of EP0254132A1 publication Critical patent/EP0254132A1/fr
Application granted granted Critical
Publication of EP0254132B1 publication Critical patent/EP0254132B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F27/02—Casings

Definitions

  • the present invention relates to means in combination with a ballast or transformer for improving its cooling, said ballast or transformer comprising a core sheet pack, a winding whose ends extend beyond the core sheet pack, a shell which surrounds the core sheet pack, a bottom plate to whose side edges the shell edges are fastened and metal end plates which are fastened to the gables of a housing made up by the shell and bottom plate and which abut the end of the winding with a thin insulating layer therebetween.
  • a corresponding means is known from AU-B-488513.
  • the disclosed housing for a choke has channels which run over the entire length of the housing parallel to the bottom plate. These channels are used for guaranteeing a good heat transfer from the sheet metal of the choke to the housing made preferably from aluminium or steel.
  • the ballast or transformer is screwed with the back of the bottom plate onto a flat, horizontal surface the channels formed within the housing have no further effect than the mentioned heat transfer by conductivity.
  • An object of the invention is to provide an apparatus for improving or intensifying the cooling of the ballast or the transformator so that the physical size of a ballast or transformater relative to its VA-quantity or -capacity can be reduced so as to save in material costs and space requirements.
  • the means consist of bent or molded rib members in said end plates, the rib members being positioned in the free space between the winding end faces and the end of a core sheet pack at a distance from the end of the core sheet pack in a manner that, within the area of said rib members, cooling air can circulate on either side of the end plate, for which purpose
  • the rib members positioned according to the invention do not increase the maximum dimensions of a ballast or transformer.
  • VA 100 W
  • the extra cost incurred by a metal plate is quite small compared to the saving in winding and magnetic material provided by a considerably increased cooling area.
  • the end plates carrying said rib members are preferably made of aluminium.
  • the rib members are designed in a manner that the edges of said metal plate are profiled to form grooves which increase its surface area. In the disposition of these grooves, it is possible to utilize the free spaces on either side of the winding end between the shell and the side face of a winding end portion.
  • the cooling effect is improved to such a degree that the size or a ballast or transformer can be reduced decisively, up to tens of percent compared to the present practice.
  • the reduction of the size of a ballast also leads to additional savings because of the reduction of the dimensions of a lighting fixture.
  • the core sheet pack of a ballast consists of E-sheets 1 and I-sheets 2.
  • a winding 6 is fitted between the E-arms and both ends of winding 6 extend beyond the ends of said core sheet pack as the winding must travel around the midmost E-arm. Regardless of what shape of sheets the core sheet pack has been made up, a typical feature in the structure is that the winding ends extend beyond the core sheet pack.
  • a core sheet pack, together with its winding, has been laid on top of a bottom plate 3.
  • the ends of bottom plate 3 are provided with holes 13 for using screws extending therethrough to fasten the ballast, for example to a lighting fixture.
  • a shell 4 made of rather thin sheet metal, envelopes the core sheet pack and its winding.
  • the edges of bottom plate 3 are provided with hock-shaped bends 3a to be grabbed by bends 4a at the edges of shell sheet 4.
  • winding 6 must be provided with a protective insulation for preventing manual touch.
  • this protective insulation has been achieved in a rather exceptional manner in connection with metal cooling plates, explained in more detail hereinbelow.
  • the gables of a housing consisting of a shell 4 and a bottom plate 3 are provided with fixed metal plates 5 abutting the ends of the winding 6 with just a thin insulating layer therebetween.
  • This insulating layer can be a separate strip of insulant or it can be an insulating coating applied to the inner surface of the metal plates 5.
  • the edges of the metal plates 5 are provided with profiled grooves 7 for increasing the cooling area of the metal plates 5.
  • the grooves 7 do not increase the size of a ballast as they are positioned in the free spaces on either side of the winding end between the shell 4 and the side face of the end of the winding 6.
  • the outer edge of the groove 7 may serve as a fastening means for the attachment to the end edge of shell 4. This attachment can be achieved in various ways, e.g. by bending one edge around the other, by spot welding together the surfaces that are facing each other, or mechanically by shaping the edge surfaces which are facing each other.
  • the direction of the rib members 7 is perpendicular to the E-arms and the bottom plate 3.
  • Between the lower edge of the metal plate 5 and the bottom plate 3 is arranged at least one air circulation passage 9 and, correspondingly, between the upper edge of the metal plate 5 and the end edge of the shell 4 is arranged at least one air circulation passage 8.
  • Passage 9 can be made by placing the lower edge of the metal plate 5 at a small gap away from the bottom plate 3 or by making holes or notches in the lower edge of the metal plate 5.
  • the upper edge of the metal plate 5, or the edge of the shell 4 connected therewith is provided with holes or notches 8.
  • Fig. 4 illustrates alternative cooling rib profiles 7', 7'', 7''' .
  • the end plates are preferably made of aluminium or an aluminium alloy which has better heat conductivity than a shell 4 made of sheet steel.
  • Ribs 7 are designed as grooves, whose outer edges are bent to extend in the direction of the shell 4 and fastened to the inner surface of the shell 4.
  • the fastening is preferably carried out by pressing the end plate material into the holes of the shell 4 while, at the same time, urging the end plate against the end of winding 6. This secures a good heat conduction contact from the winding 6 to the shell 4 by way of the end plates 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Claims (4)

  1. Dispositif combiné à un ballast ou un transformateur pour en améliorer le refroidissement, ledit ballast ou transformateur comprenant un paquet de tôle de noyau (1, 2), un enroulement (6) dont les extrémités s'étendent au-delà du paquet de tôle de noyau, une enveloppe (4) qui entoure le paquet de tôle de noyau, une plaque de base (3) aux arêtes latérales (3a) de laquelle les bords de l'enveloppe (4a) sont attachés et des plaques d'extrémité en métal (5) qui sont attachées aux pignons d'un bâti constitué par l'enveloppe (4) et la plaque de base (3) et qui butent contre l'extrémité de l'enroulement (6) avec une mince couche isolante (10) entre les deux. caractérisé en ce que le dispositif consiste en des organes à nervures (7) courbés ou moulés dans les plaques d'extrémité mentionnées, les organes à nervures (7) étant positionnés dans les espaces libres entre les faces d'extrémité de l'enroulement et les extrémités d'un paquet de tôle de noyau à un certain écart des extrémités du paquet de tôle de noyau (1, 2) de telle manière que de l'air de refroidissement puisse circuler à l'intérieur de la zone des organes à nervures mentionnés de nimporte quel côté de la plaque d'extrémité, ce pour quoi
    - le bord inférieur de chaque plaque d'extrémité (5) est placé à un petit jeu (9) de la plaque de fond (3) ou le bord inférieur de la plaque d'extrémité (5) est pourvu de trous ou d'entailles (9) et
    - le bord supérieur de chaque plaque d'extrémité (5), ou le bord de l'enveloppe (4) qui lui est relié, est pourvu de trous ou d'entailles (8) qui s'ouvrent dans l'espace libre entre l'organe à nervure (7) et l'extrémité du paquet de tôle de noyau (1, 2).
  2. Dispositif selon la revendication 1, dans lequel les organes à nervures sont en forme de rainures (7) profilées dans les bords de la plaque d'extrémité (5) pour augmenter sa zone de surface, les rainures mentionnées étant positionnées dans les espaces libres de nimporte quel côté des extrémités de l'enroulement (6) entre l'enveloppe (4) et les faces latérales des sections d'extrémité de l'enroulement (6) et les bords extérieurs des rainures mentionnées (7) étant courbés pour s'étendre dans la direction de l'enveloppe (4) et attachés à la surface intérieure de ladite enveloppe.
  3. Dispositif selon la revendication 1 ou 2 dans lequel la plaque d'extrémité est faite en aluminium ou en un alliage d'aluminium dont la conductibilité de chaleur est meilleure que celle de l'enveloppe (4).
  4. Dispositif selon la revendication 1, 2 ou 3 dans lequel le paquet de tôle de noyau consiste en tôles en E et I et la direction des organes à nervures (7) est perpendiculaire aux bras en E et à la plaque du fond (3).
EP87109829A 1986-07-15 1987-07-08 Dispositif pour ballast ou transformateur améliorant le refroidissement Expired - Lifetime EP0254132B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI862944 1986-07-15
FI862944A FI78190C (fi) 1986-07-15 1986-07-15 Anordning i en drossel eller i en transformator foer att effektivera dess kylning.

Publications (2)

Publication Number Publication Date
EP0254132A1 EP0254132A1 (fr) 1988-01-27
EP0254132B1 true EP0254132B1 (fr) 1992-04-08

Family

ID=8522915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109829A Expired - Lifetime EP0254132B1 (fr) 1986-07-15 1987-07-08 Dispositif pour ballast ou transformateur améliorant le refroidissement

Country Status (3)

Country Link
EP (1) EP0254132B1 (fr)
DE (1) DE3778080D1 (fr)
FI (1) FI78190C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH683214A5 (de) * 1992-03-26 1994-01-31 Knobel Lichttech Gegen Berührung isolierter Kleinleistungstransformator.
US6492890B1 (en) 2000-03-10 2002-12-10 Koninkijlike Philips Electronics N.V. Method and apparatus for cooling transformer coils
US9343903B2 (en) 2013-03-14 2016-05-17 Mark Hauenstein Methods and systems architecture to virtualize energy functions and processes into a cloud based model
US11289981B2 (en) * 2018-08-17 2022-03-29 Tai-Her Yang Frame device of iron core of static electrical machine having outwardly-extended heat dissipation fins and/or heat dissipation hole

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1272444B (de) * 1966-04-30 1968-07-11 May & Christe G M B H Transfor Drosselspule oder Transformator fuer Leuchtstofflampen oder andere Gasentladungslampen

Also Published As

Publication number Publication date
FI862944A (fi) 1988-01-16
FI78190B (fi) 1989-02-28
DE3778080D1 (de) 1992-05-14
EP0254132A1 (fr) 1988-01-27
FI78190C (fi) 1989-06-12
FI862944A0 (fi) 1986-07-15

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