EP0099274B1 - Transformer, particularly a tension reducer for electric welding equipment - Google Patents

Transformer, particularly a tension reducer for electric welding equipment Download PDF

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Publication number
EP0099274B1
EP0099274B1 EP83401128A EP83401128A EP0099274B1 EP 0099274 B1 EP0099274 B1 EP 0099274B1 EP 83401128 A EP83401128 A EP 83401128A EP 83401128 A EP83401128 A EP 83401128A EP 0099274 B1 EP0099274 B1 EP 0099274B1
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EP
European Patent Office
Prior art keywords
cooling
turns
winding
secondary circuit
transformer
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Expired
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EP83401128A
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German (de)
French (fr)
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EP0099274A1 (en
Inventor
Jean-Paul Fantou
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A R O
ARO SA
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A R O
ARO SA
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Priority to AT83401128T priority Critical patent/ATE23233T1/en
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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
    • H01F27/16—Water 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
    • H01F27/08—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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2876—Cooling

Definitions

  • the present invention relates to a transformer, in particular step-down, the secondary circuit of such a transformer, of the type consisting of a wound strip, being in principle traversed by high intensity currents.
  • transformers of this type find an important application in electric welding machines, in particular portable machines for spot welding, known under the name of welding tongs, whose secondary, which can be traversed by intensities very high, of the order of a few thousand amperes, supplies welding electrodes.
  • the invention relates more specifically to the cooling system of such transformers, and in particular the cooling of the windings, that is to say essentially of the electrical circuit.
  • cooling circuit provision was made to develop it, for example in the form of a pipe in which a coolant circulates, and incorporated, for example by being brazed, between two juxtaposed parts of the copper strip and, where appropriate aluminum, wrapped around the core and constituting the turn (s) of the secondary circuit, and this according to all appropriate technological methods.
  • a transformer according to the invention in particular step-down for electric welding machine, comprising one or more turns cooled by means of pipes inside which circulates a cooling fluid, said turns being incorporated or interposed in the primary and / or secondary windings and separating them into several parts while being in thermal contact with them, is characterized in that this or these turns are electrically inactive, - have only a cooling role - and are not part of the electrical circuits of said windings.
  • the number of sections or parts in which the primary winding (if necessary secondary) of the transformer can be increased as much as is desirable, two neighboring sections being separated each time by a cooled coil - health, since the multiplication of inactive cooling turns (not constituting a part of the electrical circuit) does not lead to any modification of the transformation ratio. It is thus understood that the invention makes it possible to further considerably increase the efficiency of the cooling of the transformer, in particular of the entirety of its primary winding, while making this cooling more homogeneous than in the past, which avoids the risk of appearance of hot spots.
  • the invention by its general design, in no way presumes how the secondary circuit may be constituted, but it is certain, in particular in the case of step-down transformers for machines with weld at very high intensity in the secondary, that it will still be entirely advantageous to constitute it essentially in the same way as in the past, namely in the form of one or more active turns (that is that is to say precisely constituting this secondary circuit) wound around the core and also cooled, these active turns can therefore have a constitution similar to that of inactive turns, can also be interposed (if necessary) between different neighboring sections of the primary winding, but being strictly limited in number, namely the number imposed by the transformation ratio.
  • a transformer according to the invention in particular a step-down transformer with high welding intensity, may also be characterized in that it comprises on the one hand a certain number - depending on the ratio of desired transformation - of active cooling turns constituting the secondary circuit, and on the other hand a certain number - depending on the desired degree of cooling - of additional cooling turns or electrically inactive dead turns, having only-
  • the invention does not, of course, preclude any configuration, and one could for example envisage dividing the winding of the primary circuit only by the additional cooling turns, that is to say the inactive turns, while the active turns of the secondary circuit would be entirely inside (if necessary outside) of the divided primary winding.
  • connection of the cooling circuit which may, according to convenience, be carried out, both with regard to the active turns and the inactive turns, in a certain number sections connected in series or in parallel, or even in a mixed manner, and connected to a suitable source of coolant (for example water).
  • a suitable source of coolant for example water
  • FIG. 1 there is shown a primary winding made of wire wound around the core 1 of a magnetic circuit 2 in M closed by a yoke 3, this winding being divided into three parts or sections 4a, 4b and 4c coaxial.
  • the sections 4b and 4c are separated by the two active turns, themselves separated by an electrical insulator 5, from a strip of copper 6 wound coaxially on said core and constituting the winding of the secondary circuit.
  • sections 4a and 4b they are separated by an additional inactive turn 7, used only for cooling this inner part of the primary, and also consisting of a copper strip coaxially wound on the core.
  • the cross section of the inactive coil 7 is less than that of the active coil 6, since it has only a cooling function and is not crossed by current.
  • These two copper strips 6 and 7 can be cooled by any appropriate means, for example by being each produced in the form of two laminated copper strips, respectively 6a-6b and 7a-7b, juxtaposed with edge, with intercalation of conduits of flattened and brazed copper cooling on the facing edges, and respectively referenced in 9 and 10, these pipes of course, for their part surrounding the core 1, the same spiral path as the corresponding bands.
  • the inlet ends of the pipes 9 and 10 are both brazed on the connection block 11, just as the other end of the pipe 9 is brazed on the connection block 12, while the outlet end of the pipe 10, referenced at 16, is connected to this same block 12 by means of an insulating elbow fitting 17, for example made of rubber, this of course to avoid a shortening secondary winding circuit 6 through the water circuit 10 and the cooling coil 7 (see, below Figure 1, the part shown torn from the lower connection block 12).
  • the cooling water circuits of the windings 6 and 7 may be in connection with those ordinarily provided for cooling each of the welding electrodes connected to the secondary of the transformer; the connections to the blocks 11 and 12 can advantageously be made by means of elastic seals.
  • FIGS. 2 and 3 various arrangements of the primary and secondary windings have been shown by way of variants, the production of the various connections possibly also being of the same type as that which has just been described with reference to FIG. 1.
  • the primary winding has been divided into four sections 19, the different separations being provided by a single central turn 20 of the secondary circuit, and two inactive turns, one exterior and the other interior, of a additional coaxial cooling winding 21.
  • the respective cooling circuits 22 and 23 can be produced as according to FIG. 1 (copper tubes flattened and brazed on the edges facing the lamellae constituting the different turns).
  • the distribution of the various windings and winding sections is similar to that of FIG. 1, comprising three sections 24 of primary winding, with the insertion of two turns isolated from one another, d 'a secondary winding 25 (with cooling pipe also in a spiral 26), and an inactive turn of an additional cooling winding 27.
  • the coolant pipe 28 of the winding 27 consists of two turns (connected in parallel or in series) spaced from each other in the width direction of the blade, which may have, on the embodiment of Figure 1, the advantage of better distribution the temperature depending on the width of the additional cooling winding.
  • Figures 4 and 5 show two possible external aspects of transformers established in accordance with the invention, without using the connection blocks of Figure 1 (outputs of independent cooling circuits).
  • the two ends of the secondary winding are referenced at 29, comprising holes 30 for connection screws. These ends consist of two adjoining strips, which facilitates their folding 31 towards the connection to the ends proper of the winding.
  • This connection (not visible in the figures) is made in a miter and is provided by solder.
  • 32 and 33 refer to the water inlet and outlet of the cooling pipe of this secondary winding, respectively.
  • the same references were used as in FIG. 1.
  • One or the other configuration will be used, depending on the connection conditions (one could also provide an end on the other side of the magnetic circuit).
  • ends 32 to 35 are of circular section to facilitate external connections, while inside the cooling pipes are flattened, as indicated above, to almost completely fill the space with rectangular section provided between the edges opposite the two strips of the same strip.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformer Cooling (AREA)
  • Dc-Dc Converters (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A voltage dropping transformer for an electric welding machine, of the type in which the secondary circuit is formed by a wound strip, is provided wherein one or more cooling turns are incorporated or inserted in the windings of the primary and/or secondary circuits, separating them into several parts while being in thermal contact therewith. The turns are electrically inactive-having solely a cooling role-and do not form part of the electric circuits of the windings.

Description

La présente invention concerne un transformateur, notamment abaisseur de tension, le circuit secondaire d'un tel transformateur, du type constitué d'une bande enroulée, étant en principe parcouru par des courants d'intensité élevée. Comme on le sait, les transformateurs de ce type trouvent une application importante dans les machines à souder électriques, notamment les machines portatives à souder par points, connues sous le nom de pinces à souder, dont le secondaire, lequel peut être parcouru par des intensités très élevées, de l'ordre de quelques milliers d'ampères, alimente des électrodes de soudage.The present invention relates to a transformer, in particular step-down, the secondary circuit of such a transformer, of the type consisting of a wound strip, being in principle traversed by high intensity currents. As is known, transformers of this type find an important application in electric welding machines, in particular portable machines for spot welding, known under the name of welding tongs, whose secondary, which can be traversed by intensities very high, of the order of a few thousand amperes, supplies welding electrodes.

L'invention concerne plus spécialement le système de refroidissement de tels transformateurs, et en particulier le refroidissement des enroulements, c'est-à-dire essentiellement du circuit électrique.The invention relates more specifically to the cooling system of such transformers, and in particular the cooling of the windings, that is to say essentially of the electrical circuit.

La demanderesse a déjà proposé dans le passé une solution permettant d'augmenter considérablement l'efficacité du système de refroidissement, cette solution consistant, en bref, à refroidir non seulement le circuit secondaire du transformateur, mais également son circuit primaire, et ceci en le divisant en plusieurs parties ou sections séparées par une ou plusieurs spires du circuit secondaire, elles-mêmes directement refroidies par un circuit de refroidissement approprié et en contact thermique avec lesdites parties du circuit primaire; autrement dit, cette solution ancienne consistait à incorporer une ou plusieurs spires refroidies de l'enroulement secondaire du transformateur dans l'enroulement du primaire, pour refroidir également ce dernier.The Applicant has already proposed in the past a solution making it possible to considerably increase the efficiency of the cooling system, this solution consisting, in short, in cooling not only the secondary circuit of the transformer, but also its primary circuit, and this by dividing into several parts or sections separated by one or more turns of the secondary circuit, themselves directly cooled by an appropriate cooling circuit and in thermal contact with said parts of the primary circuit; in other words, this old solution consisted in incorporating one or more cooled turns of the secondary winding of the transformer into the winding of the primary, to also cool the latter.

Quant audit circuit de refroidissement, on prévoyait de l'élaborer par exemple sous la forme d'une conduite dans laquelle circule un fluide réfrigérant, et incorporée, par exemple en étant brasée, entre deux parties juxtaposées de la bande de cuivre et le cas échéant d'aluminium, enroulée autour du noyau et constituant la ou les spires du circuit secondaire, et ceci selon toutes modalités technologiques appropriées.As for said cooling circuit, provision was made to develop it, for example in the form of a pipe in which a coolant circulates, and incorporated, for example by being brazed, between two juxtaposed parts of the copper strip and, where appropriate aluminum, wrapped around the core and constituting the turn (s) of the secondary circuit, and this according to all appropriate technological methods.

Cette solution s'est avérée satisfaisante dans de nombreux cas, mais les progrès de la technique, notamment dans le domaine du soudage automatique à grande cadence par robots, en ont montré les limites et ont rendu nécessaire de la perfectionner à nouveau pour augmenter encore l'efficacité du refroidissement, et ceci tout en conservant, ce qui est particulièrement indispensable dans ce cas précis d'utilisation, la faculté d'utiliser des transformateurs d'encombrement et de poids aussi réduits que possible et à haut rendement, pour ne pas diminuer les performances intrinsèques desdits robots.This solution has proved satisfactory in many cases, but advances in the technique, in particular in the field of high-speed automatic robot welding, have shown its limits and have made it necessary to perfect it again to further increase the cooling efficiency, while retaining, which is particularly essential in this specific case of use, the ability to use transformers of size and weight as low as possible and high efficiency, so as not to decrease the intrinsic performance of said robots.

Or, on ne peut espérer dépasser un certain degré de refroidissement en extrapolant simplement la solution ancienne qui vient d'être décrite et en divisant l'enroulement du primaire en un plus grand nombre de parties ou sections, car cela conduirait automatiquement à augmenter aussi le nombre des spires refroidissantes du circuit secondaire devant séparer ces sections, ce qui est impossible, ce nombre étant lui-même imposé par le rapport de transformation, pour un nombre donné de tours au primaire.However, one cannot hope to exceed a certain degree of cooling by simply extrapolating the old solution which has just been described and by dividing the winding of the primary in a greater number of parts or sections, because that would automatically lead to increasing the number of cooling turns of the secondary circuit having to separate these sections, which is impossible, this number being itself imposed by the transformation ratio, for a given number of turns in the primary.

Le but de la présente invention est de résoudre ce problème, et à cet effet, un transformateur conforme à l'invention, notamment abaisseur de tension pour machine à souder électrique, comportant une ou plusieurs spires refroidies au moyen de conduites à l'intérieur desquelles circule un fluide de refroidissement, lesdites spires étant incorporées ou intercalées dans les enroulements primaire et/ou secondaire et les séparant en plusieurs parties en étant en contact thermique avec celles-ci, est caractérisé en ce que cette ou ces spires sont électriquement inactives, - ont uniquement un rôle de refroidissement- et ne font pas partie des circuits électriques desdits enroulements.The purpose of the present invention is to solve this problem, and for this purpose, a transformer according to the invention, in particular step-down for electric welding machine, comprising one or more turns cooled by means of pipes inside which circulates a cooling fluid, said turns being incorporated or interposed in the primary and / or secondary windings and separating them into several parts while being in thermal contact with them, is characterized in that this or these turns are electrically inactive, - have only a cooling role - and are not part of the electrical circuits of said windings.

Ainsi, grâce à l'invention on peut augmenter autant que cela est souhaitable le nombre des sections ou parties en lesquelles on divise l'enroulement primaire (le cas échéant secondaire) du transformateur, deux sections voisines étant séparées à chaque fois par une spire refroidis- sante, puisque la multiplication des spires refroidissantes inactives (ne constituant pas une partie du circuit électrique) n'entraîne aucune modification du rapport de transformation. On conçoit ainsi que l'invention permette d'augmenter encore considérablement l'efficacité du refroidissement du transformateur, en particulier de l'intégralité de son enroulement primaire, tout en rendant ce refroidissement plus homogène que par le passé, ce qui évite le risque d'apparition de points chauds.Thus, thanks to the invention, the number of sections or parts in which the primary winding (if necessary secondary) of the transformer can be increased as much as is desirable, two neighboring sections being separated each time by a cooled coil - health, since the multiplication of inactive cooling turns (not constituting a part of the electrical circuit) does not lead to any modification of the transformation ratio. It is thus understood that the invention makes it possible to further considerably increase the efficiency of the cooling of the transformer, in particular of the entirety of its primary winding, while making this cooling more homogeneous than in the past, which avoids the risk of appearance of hot spots.

Comme on le voit d'après ce qui précède, l'invention, de par sa conception générale, ne présume en rien la façon dont pourra être constitué le circuit secondaire, mais il est certain, notamment dans le cas des transformateurs abaisseurs pour machines à souder à très haute intensité dans le secondaire, qu'il sera encore tout à fait avantageux de constituer celui-ci essentiellement de la même manière que par le passé, à savoir sous la forme d'une ou plusieurs spires actives (c'est-à-dire constituant précisément ce circuit secondaire) enroulées autour du noyau et également refroidies, ces spires actives pouvant donc avoir une constitution semblable à celle des spires inactives, être également intercalées (le cas échéant) entre différentes sections voisines de l'enroulement primaire, mais étant en nombre strictement limité, à savoir le nombre imposé par le rapport de transformation.As can be seen from the foregoing, the invention, by its general design, in no way presumes how the secondary circuit may be constituted, but it is certain, in particular in the case of step-down transformers for machines with weld at very high intensity in the secondary, that it will still be entirely advantageous to constitute it essentially in the same way as in the past, namely in the form of one or more active turns (that is that is to say precisely constituting this secondary circuit) wound around the core and also cooled, these active turns can therefore have a constitution similar to that of inactive turns, can also be interposed (if necessary) between different neighboring sections of the primary winding, but being strictly limited in number, namely the number imposed by the transformation ratio.

En d'autres termes, ceci étant, un transformateur conforme à l'invention, en particulier un transformateur abaisseur à haute intensité de soudage, pourra encore se caractériser en ce qu'il comporte d'une part un certain nombre - fonction du rapport de transformation désiré - de spires refroidissantes actives constituant le circuit secondaire, et d'autre part un certain nombre - fonction du degré de refroidissement désiré - de spires refroidissantes supplémentaires ou spires mortes électriquement inactives, ayant unique-In other words, this being so, a transformer according to the invention, in particular a step-down transformer with high welding intensity, may also be characterized in that it comprises on the one hand a certain number - depending on the ratio of desired transformation - of active cooling turns constituting the secondary circuit, and on the other hand a certain number - depending on the desired degree of cooling - of additional cooling turns or electrically inactive dead turns, having only-

ment une fonction de refroidissement et ne faisant pas partie du circuit secondaire, tout ou partie de l'ensemble de ces spires actives et spires supplémentaires divisant en sections l'enroulement du circuit primaire.ment a cooling function and not forming part of the secondary circuit, all or part of all of these active turns and additional turns dividing the winding of the primary circuit into sections.

L'invention n'exclut, bien entendu, aucune configuration, et l'on pourrait par exemple envisager de diviser l'enroulement du circuit primaire seulement par les spires refroidissantes supplémentaires, c'est-à-dire les spires inactives, tandis que les spires actives du circuit secondaire seraient entièrement à l'intérieur (le cas échéant à l'extérieur) de l'enroulement primaire divisé.The invention does not, of course, preclude any configuration, and one could for example envisage dividing the winding of the primary circuit only by the additional cooling turns, that is to say the inactive turns, while the active turns of the secondary circuit would be entirely inside (if necessary outside) of the divided primary winding.

Quant à la réalisation technologique de ces différentes spires de refroidissement, qu'elles soient actives ou inactives, elle pourra, comme cela a été indiqué plus haut, être de tout type approprié connu, et par exemple mettre en oeuvre des bandes ou lamelles de cuivre laminé juxtaposées de chant, avec intercalation d'une conduite de fluide de refroidissement aplatie et brasée, ou encore des bandes d'aluminium filé avec passage longitudinal central pour ce fluide, etc.As for the technological production of these different cooling turns, whether active or inactive, it may, as has been indicated above, be of any known suitable type, and for example use copper strips or strips laminate juxtaposed with edges, with the insertion of a flattened and brazed coolant line, or spun aluminum strips with central longitudinal passage for this fluid, etc.

Il en sera de même - quant aux nombreuses variantes possibles - pour ce qui est du branchement du circuit de refroidissement, lequel pourra, selon la convenance, être réalisé, tant pour ce qui concerne les spires actives que les spires inactives, en un certain nombre de sections connectées en série ou en parallèle, ou encore de façon mixte, et branchées sur une source de fluide de refroidissement adéquate (par exemple de l'eau).It will be the same - as for the many possible variants - with regard to the connection of the cooling circuit, which may, according to convenience, be carried out, both with regard to the active turns and the inactive turns, in a certain number sections connected in series or in parallel, or even in a mixed manner, and connected to a suitable source of coolant (for example water).

En tout état de cause, différents modes d'exécution de l'invention, ainsi que certains détails de réalisation, vont maintenant être décrits à titre d'exemples nullement limitatifs, avec référence aux figures du dessin annexé, dans lequel:

  • - la figure 1 est une vue schématique d'un transformateur réalisé conformément à l'invention, en perspective avec portions arrachées et deux coupes réalisées selon deux plans perpendiculaires et montrant notamment la section transversale des enroulements du primaire et du secondaire d'une part, et les bornes de connexion des différents circuits d'autre part;
  • - les figures 2 et 3 sont des vues en coupe montrant en section tranversale d'autres agencements possibles des enroulements; et
  • - les figures 4 et 5 sont des vues en perspective, également schématiques, montrant l'aspect extérieur de deux transformateurs réalisés selon l'invention.
In any event, various embodiments of the invention, as well as certain details of embodiment, will now be described by way of non-limiting examples, with reference to the figures in the appended drawing, in which:
  • FIG. 1 is a schematic view of a transformer produced in accordance with the invention, in perspective with cutaway portions and two sections made in two perpendicular planes and showing in particular the cross section of the windings of the primary and secondary on the one hand, and the connection terminals of the various circuits on the other hand;
  • - Figures 2 and 3 are sectional views showing in cross section other possible arrangements of the windings; and
  • - Figures 4 and 5 are perspective views, also schematic, showing the external appearance of two transformers produced according to the invention.

Sur la figure 1, on a représenté un enroulement primaire réalisé en fil bobiné autour du noyau 1 d'un circuit magnétique 2 en M fermé par une culasse 3, cet enroulement étant divisé en trois parties ou sections 4a, 4b et 4c coaxiales. Les sections 4b et 4c sont séparées par les deux spires actives, elles-mêmes séparées par un isolant électrique 5, d'une bande de cuivre 6 enroulée coaxialement sur ledit noyau et constituant l'enroulement du circuit secondaire. Quant aux sections 4a et 4b, elles sont séparées par une spire supplémentaire 7 inactive, servant uniquement au refroidissement de cette partie intérieure du primaire, et également constituée d'une bande de cuivre enroulée coaxialement sur le noyau.In Figure 1, there is shown a primary winding made of wire wound around the core 1 of a magnetic circuit 2 in M closed by a yoke 3, this winding being divided into three parts or sections 4a, 4b and 4c coaxial. The sections 4b and 4c are separated by the two active turns, themselves separated by an electrical insulator 5, from a strip of copper 6 wound coaxially on said core and constituting the winding of the secondary circuit. As for sections 4a and 4b, they are separated by an additional inactive turn 7, used only for cooling this inner part of the primary, and also consisting of a copper strip coaxially wound on the core.

Dans cet exemple, on voit que la section transversale de la spire inactive 7 est inférieure à celle de la spire active 6, étant donné qu'elle n'a qu'une fonction de refroidissement et qu'elle n'est pas traversée par du courant.In this example, it can be seen that the cross section of the inactive coil 7 is less than that of the active coil 6, since it has only a cooling function and is not crossed by current.

Ces deux bandes de cuivre 6 et 7 peuvent être refroidies par tous moyens appropriés, par exemple en étant réalisées chacune sous la forme de deux lamelles en cuivre laminé, respectivement 6a-6b et 7a-7b, juxtaposées de chant, avec intercalation de conduites de refroidissement de cuivre aplaties et brasées sur les chants en regard, et respectivement référencées en 9 et 10, ces conduites suivant bien entendu, pour leur partie entourant le noyau 1, le même cheminement en spirale que les bandes correspondantes.These two copper strips 6 and 7 can be cooled by any appropriate means, for example by being each produced in the form of two laminated copper strips, respectively 6a-6b and 7a-7b, juxtaposed with edge, with intercalation of conduits of flattened and brazed copper cooling on the facing edges, and respectively referenced in 9 and 10, these pipes of course, for their part surrounding the core 1, the same spiral path as the corresponding bands.

D'une façon générale, tout mode de réalisation approprié pourra être adopté et entre autres ceux qui sont connus par le brevet français de la demanderesse n° 1 068 283.In general, any suitable embodiment may be adopted and, among others, those which are known from the applicant's French patent No. 1,068,283.

Sur cette même figure 1, on a référencé en 11 et 12 deux blocs de cuivre brasés sur les deux extrémités sorties de l'enroulement secondaire 6 et servant d'une part à permettre d'établir les connexions électriques du circuit extérieur à relier à cet enroulement, par l'intermédiaire de trous taraudés tels que 13, et d'autre part à permettre la mise en communication des conduites 9 et 10 (lesquelles sont montées en parallèle) avec une source extérieure d'eau de refroidissement (non représentée), lesdits blocs comportant à cet effet des ouvertures d'entrée et de sortie d'eau, respectivement 14 et 15.In this same FIG. 1, there are referenced in 11 and 12 two copper blocks brazed on the two ends exited from the secondary winding 6 and serving on the one hand to enable electrical connections to the external circuit to be connected to this to be established winding, through tapped holes such as 13, and on the other hand to allow the communication of the pipes 9 and 10 (which are mounted in parallel) with an external source of cooling water (not shown), said blocks comprising for this purpose water inlet and outlet openings, 14 and 15 respectively.

Comme on peut le voir sur la figure, les extrémités d'entrée des conduites 9 et 10 sont toutes deux brasées sur le bloc de connexion 11, de même que l'autre extrémité de la conduite 9 est brasée sur le bloc de connexion 12, tandis que l'extrémité de sortie de la conduite 10, référencée en 16, est reliée à ce même bloc 12 par l'intermédiaire d'un raccord coudé isolant 17, par exemple en caoutchouc, ceci bien entendu pour éviter une mise en court-circuit de l'enroulement secondaire 6 par le circuit d'eau 10 et la spire de refroidissement 7 (voir, au-dessous de la figure 1, la partie représentée arrachée du bloc de connexion inférieur 12). On peut noter ici que les circuits d'eau de refroidissement des enroulements 6 et 7 pourront être en liaison avec ceux prévus ordinairement pour le refroidissement de chacune des électrodes de soudage connectées au secondaire du transformateur; les connexions sur les blocs 11 et 12 pourront s'effectuer avantageusement par l'intermédiaire de joints d'étanchéité élastiques.As can be seen in the figure, the inlet ends of the pipes 9 and 10 are both brazed on the connection block 11, just as the other end of the pipe 9 is brazed on the connection block 12, while the outlet end of the pipe 10, referenced at 16, is connected to this same block 12 by means of an insulating elbow fitting 17, for example made of rubber, this of course to avoid a shortening secondary winding circuit 6 through the water circuit 10 and the cooling coil 7 (see, below Figure 1, the part shown torn from the lower connection block 12). It may be noted here that the cooling water circuits of the windings 6 and 7 may be in connection with those ordinarily provided for cooling each of the welding electrodes connected to the secondary of the transformer; the connections to the blocks 11 and 12 can advantageously be made by means of elastic seals.

Il est à noter enfin, concernant ces blocs 11 et 12, qu'ils seront de préférence ancrés dans de la résine synthétique polymérisée enrobant-les chignons 18 des enroulements et empêchant les vibrations.Finally, it should be noted, concerning these blocks 11 and 12, that they will preferably be anchored in polymerized synthetic resin coating the buns 18 of the windings and preventing vibrations.

Aux figures 2 et 3, on a représenté à titre de variantes des dispositions différentes des enroulements primaire et secondaire, la réalisation des différentes connexions pouvant par ailleurs être du même type que celle qui vient d'être décrite avec référence à la figure 1.In FIGS. 2 and 3, various arrangements of the primary and secondary windings have been shown by way of variants, the production of the various connections possibly also being of the same type as that which has just been described with reference to FIG. 1.

Selon la figure 2, l'enroulement primaire a été divisé en quatre sections 19, les différentes séparations étant fournies par une seule spire centrale 20 de circuit secondaire, et deux spires inactives, l'une extérieure et l'autre intérieure, d'un enroulement supplémentaire coaxial de refroidissement 21. Les circuits de refroidissement respectifs 22 et 23 peuvent être réalisés comme selon la figure 1 (tubes de cuivre aplatis et brasés sur les chants en regard des lamelles constituant les différentes spires).According to FIG. 2, the primary winding has been divided into four sections 19, the different separations being provided by a single central turn 20 of the secondary circuit, and two inactive turns, one exterior and the other interior, of a additional coaxial cooling winding 21. The respective cooling circuits 22 and 23 can be produced as according to FIG. 1 (copper tubes flattened and brazed on the edges facing the lamellae constituting the different turns).

Selon la figure 3, la répartition des différents enroulements et sections d'enroulement est semblable à celle de la figure 1, comportant trois sections 24 d'enroulement primaire, avec intercalation de deux spires isolées l'une par rapport à l'autre, d'un enroulement secondaire 25 (avec conduite de refroidissement également en spirale 26), et d'une spire inactive d'un enroulement supplémentaire de refroidissement 27. Cependant, ici la conduite de fluide de refroidissement 28 de l'enroulement 27 est constituée de deux spires (connectées en parallèle ou en série) espacées l'une de l'autre dans le sens de la largeur de la lame, ce qui peut présenter, sur le mode de réalisation de la figure 1, l'avantage d'une meilleure répartition de la température selon la largeur de l'enroulement supplémentaire de refroidissement.According to FIG. 3, the distribution of the various windings and winding sections is similar to that of FIG. 1, comprising three sections 24 of primary winding, with the insertion of two turns isolated from one another, d 'a secondary winding 25 (with cooling pipe also in a spiral 26), and an inactive turn of an additional cooling winding 27. However, here the coolant pipe 28 of the winding 27 consists of two turns (connected in parallel or in series) spaced from each other in the width direction of the blade, which may have, on the embodiment of Figure 1, the advantage of better distribution the temperature depending on the width of the additional cooling winding.

Enfin, les figures 4 et 5 montrent deux aspects extérieurs possibles de transformateurs établis conformément à l'invention, sans utilisation des blocs de connexion de la figure 1 (sorties des circuits de refroidissement indépendantes).Finally, Figures 4 and 5 show two possible external aspects of transformers established in accordance with the invention, without using the connection blocks of Figure 1 (outputs of independent cooling circuits).

Sur ces figures, on a référencé en 29 les deux extrémités sorties de l'enroulement secondaire, comportant des trous 30 pour des vis de connexion. Ces extrémités sont constituées de deux lamelles accolées, ce qui facilite leur pliage 31 vers le raccordement aux extrémités proprement dites de l'enroulement. Ce raccordement (non visible sur les figures) s'effectue en onglet et est assuré par des brasures. On a référencé en outre, en 32 et 33, respectivement l'entrée et la sortie d'eau de la conduite de refroidissement de cet enroulement secondaire. Pour le circuit magnétique, on a utilisé les mêmes références que sur la figure 1.In these figures, the two ends of the secondary winding are referenced at 29, comprising holes 30 for connection screws. These ends consist of two adjoining strips, which facilitates their folding 31 towards the connection to the ends proper of the winding. This connection (not visible in the figures) is made in a miter and is provided by solder. In addition, 32 and 33 refer to the water inlet and outlet of the cooling pipe of this secondary winding, respectively. For the magnetic circuit, the same references were used as in FIG. 1.

Enfin, il y a lieu de noter que, dans le mode de réalisation de la figure 4, on a représenté l'entrée 34 et la sortie 35 de la conduite d'eau de l'enroulement supplémentaire de refroidissement d'un même côté du chignon 18, alors que sur la figure 5, à titre de variante, on les a représentées sur les deux côtés opposés de ce chignon.Finally, it should be noted that, in the embodiment of Figure 4, there is shown the inlet 34 and the outlet 35 of the water pipe of the additional cooling winding on the same side of the bun 18, while in FIG. 5, as a variant, they have been shown on the two opposite sides of this bun.

On utilisera l'une ou l'autre configuration, selon les conditions de branchement (on pourrait aussi prévoir une extrémité de l'autre côté du circuit magnétique).One or the other configuration will be used, depending on the connection conditions (one could also provide an end on the other side of the magnetic circuit).

On remarque qu'avantageusement les extrémités 32 à 35 sont à section circulaire pour faciliter les branchements extérieurs, alors qu'à l'intérieur les conduites de refroidissement sont aplaties, comme signalé plus haut, pour remplir quasi totalement l'espace à section rectangulaire ménagé entre les chants en regard des deux lamelles d'une même bande.It is noted that advantageously the ends 32 to 35 are of circular section to facilitate external connections, while inside the cooling pipes are flattened, as indicated above, to almost completely fill the space with rectangular section provided between the edges opposite the two strips of the same strip.

Ceci est particulièrement vrai pour le nombre et la répartition des différentes parties ou sections de l'enroulement primaire, pour le nombre et la répartition des spires dites actives constituant l'enroulement secondaire, ceux des spires dites inactives constituant l'enroulement supplémentaire de refroidissement, les matières utilisées, sections et autres dimensions des circuits magnétique et électriques, modes de branchement et de connexions, mode de réalisation des différents circuits de refroidissement, applications envisagées, etc.This is particularly true for the number and distribution of the different parts or sections of the primary winding, for the number and distribution of the so-called active turns constituting the secondary winding, those of the so-called inactive turns constituting the additional cooling winding, the materials used, sections and other dimensions of the magnetic and electrical circuits, methods of connection and connections, embodiment of the various cooling circuits, envisaged applications, etc.

Claims (5)

1. A transformer, more particularly a stepdown transformer for electrical welding apparatus, the transformer being of the kind in which the secondary circuit is embodied by a wound strip comprising one or more turns (7) cooled by means of ducts (10) through which a cooling fluid flows, the turns being incorporated or interleaved in the windings of the primary circuit (4a, 4b, 4c) and/or secondary circuit (6) and separating them into a number of parts while being in heat contact therewith, characterised in that the or each turn (7) is electrically inoperative, serves solely for cooling and does not form part of the electrical circuits of the windings.
2. A transformer according to claim 1, characterised in that it comprises a number, which depends upon the required transformation ratio, of operative cooling turns (6) forming the secondary circuit winding and a number, which depends upon the required extent of cooling, of supplementary cooling turns or dead turns (7) which are electrically inoperative, serve solely for cooling and do not form part of the secondary circuit, all or some of the system of operative turns (6) and supplementary turns (7) dividing the primary circuit winding into parts or sections (4a, 4b, 4c).
3. A transformer according to claim 1 or 2, characterised in that it comprises at least two connection blocks (11, 12) electrically connected to the ends of the secondary circuit winding (6) and operative to connect the secondary circuit to the external electrical circuit to be energized (welding electrodes or the like) and to connect the or each cooling turn (the or each operative turn (6) and/or the or each inoperative turn (7)) to a cooling fluid supply circuit.
4. A transformer according to claim 3 in which the fluid cooling the operative turns (6) of the secondary circuit winding and the supplementary inoperative cooling turns (7) flows through ducts in thermal and electrical contact with metal strips operative as the turns which are, for example, brazed between the opposite edges of two lamellae which form such strips, characterised in that the ends of the ducts (9,10) are directly connected with electrical contact to the connection blocks (11, 12) except for at least one (16) of the ends of the cooling duct of the or each supplementary cooling turn, such end (16) being connected to the corresponding connection block (11 or 12) by way of an insulating sleeve (17) which prevents short- circuiting of the secondary winding (6).
5. A transformer according to claim 3 or 4, characterised in that the connection between the connection blocks (11, 12) and, on the one hand, the ends of the secondary circuit winding (6) and, on the other hand, the ends (except one) of the cooling circuit, is made by brazing or welding, the connection blocks also being anchored in the polymerized synthetic resin in which the coils (18) of the windings are embedded.
EP83401128A 1982-06-08 1983-06-03 Transformer, particularly a tension reducer for electric welding equipment Expired EP0099274B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401128T ATE23233T1 (en) 1982-06-08 1983-06-03 TRANSFORMER, ESPECIALLY FOR DOWN-TRANSFORMING VOLTAGES FOR ELECTRIC WELDING MACHINE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209967A FR2528224B1 (en) 1982-06-08 1982-06-08 TRANSFORMER, IN PARTICULAR A VOLTAGE LOWERER FOR AN ELECTRIC WELDING MACHINE
FR8209967 1982-06-08

Publications (2)

Publication Number Publication Date
EP0099274A1 EP0099274A1 (en) 1984-01-25
EP0099274B1 true EP0099274B1 (en) 1986-10-29

Family

ID=9274761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401128A Expired EP0099274B1 (en) 1982-06-08 1983-06-03 Transformer, particularly a tension reducer for electric welding equipment

Country Status (7)

Country Link
US (1) US4543552A (en)
EP (1) EP0099274B1 (en)
JP (1) JPS58216408A (en)
AT (1) ATE23233T1 (en)
DE (1) DE3367299D1 (en)
ES (1) ES8402674A1 (en)
FR (1) FR2528224B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315836A1 (en) * 1983-04-30 1984-10-31 Dornier System Gmbh, 7990 Friedrichshafen Device for cooling electromagnetic coils
US5097241A (en) * 1989-12-29 1992-03-17 Sundstrand Corporation Cooling apparatus for windings
EP0982832A3 (en) * 1996-08-07 2000-08-09 Sumitomo Wiring Systems, Ltd. Charging system for electric vehicle
US20090322460A1 (en) * 2008-06-25 2009-12-31 Lin Hsun-I High-frequency switching-type direct-current rectifier
JP6527931B1 (en) * 2017-12-18 2019-06-12 株式会社三社電機製作所 Water-cooled transformer
TWI708272B (en) * 2020-02-24 2020-10-21 飛宏科技股份有限公司 Electromagnetic apparatus with heat sink structure

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GB812162A (en) * 1956-03-20 1959-04-22 Ferranti Ltd Improvements relating to electrical transformers
FR1130780A (en) * 1957-02-12
US1394044A (en) * 1919-03-25 1921-10-18 Gen Electric Water-cooled transformer
GB284774A (en) * 1926-11-03 1928-02-03 Neville Ryland Davis Improvements in or relating to fluid cooled conductors for alternating electric currents
DE686380C (en) * 1934-06-24 1940-01-08 Aeg Transformer without a boiler
US2579522A (en) * 1946-02-04 1951-12-25 Ohio Crankshaft Co Transformer construction
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Also Published As

Publication number Publication date
ATE23233T1 (en) 1986-11-15
FR2528224A1 (en) 1983-12-09
JPS58216408A (en) 1983-12-16
ES522994A0 (en) 1984-03-01
FR2528224B1 (en) 1985-06-21
US4543552A (en) 1985-09-24
DE3367299D1 (en) 1986-12-04
EP0099274A1 (en) 1984-01-25
ES8402674A1 (en) 1984-03-01

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