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EP0099274B1 - Transformator, insbesondere zum Herabtransformieren von Spannungen für Elektroschweissgerät - Google Patents

Transformator, insbesondere zum Herabtransformieren von Spannungen für Elektroschweissgerät 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
Authority
EP
European Patent Office
Prior art keywords
cooling
turns
winding
secondary circuit
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.)
Expired
Application number
EP83401128A
Other languages
English (en)
French (fr)
Other versions
EP0099274A1 (de
Inventor
Jean-Paul Fantou
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.)
A R O
ARO SA
Original Assignee
A R O
ARO SA
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 A R O, ARO SA filed Critical A R O
Priority to AT83401128T priority Critical patent/ATE23233T1/de
Publication of EP0099274A1 publication Critical patent/EP0099274A1/de
Application granted granted Critical
Publication of EP0099274B1 publication Critical patent/EP0099274B1/de
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
    • H01F27/10—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.

Landscapes

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

Claims (5)

1. Transformator, insbesondere Spannungsabsenktransformator, für elektrische Schweissmaschinen, derjenigen Bauart, bei der der Sekundärkreis von einem gewickelten Band gebildet ist, der eine oder mehrere Kühlspiralen (7) aufweist, wobei vermittels von Leitungen (10) im Inneren desselben ein Kühlfluid zirkuliert, wobei die genannten Spiralen in den Wicklungen (4a, 4b, 4c) des Primärkreises und/oder Sekundärkreises (6) eingebettet oder zwischengelegt sind und wobei sie diese voneinander an vielen Stellen, dadurch dass sie thermisch mit denen in Kontakt sind, trennen, dadurch gekennzeichnet, dass diese Spiralen (7) elektrisch inaktiv sind, - sie haben nur die Kühlfunktion - und nicht Teil der elektrischen Kreise der genannten Spulenwicklungen sind.
2. Transformator nach Anspruch 1, dadurch gekennzeichnet, dass er einerseits eine gewisse Anzahl - abhängig von der gewünschten Transformation-von aktiven Kühlspiralen (6) aufweist, die die Wicklungen des Sekundärkreises bilden und andererseits eine gewisse Zahl - abhängig von dem gewünschten Kühlgrad - von Zusatzwicklungen oder toten Spiralen (7) aufweist, die elektrisch inaktiv sind und einzig eine Kühlfunktion haben und nicht einen Teil des Sekundärkreises bilden, wobei alle oder ein Teil der Gemeinsamtkeit der aktiven Spiralen (6) und der Zusatzspiralen (7) die Spule des Primärkreises in Sektionen (4a, 4b und 4c) aufteilen.
3. Transformator nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass er wenigstens zwei Verbindungsblocks (11 und 12) aufweist, die elektrisch an den Enden der Wicklung (6) des Sekundärkreises verbunden sind und zum einen Teil dazu dienen, diesen Sekundärkreis elektrisch mit einem externen Verbraucher zu verbinden (Schweisselektroden oder anderes) und zum anderen, um die Kühlspule oder -spulen (aktive 6 und/oder inaktive 7) mit einem Versorgungskreis für Kühlflüssigkeit zu verbinden.
4. Transformator nach Anspruch 3, bei dem das Kühlfluid der aktiven Wicklungen des Sekundärkreises (6) und der inaktiven Zusatzkühlwicklungen (7) in diesen Leitungen im thermischen und elektrischen Kontakt mit den Metallbändern zirkuliert, die diese Wicklungen bilden, wobei diese beispielsweise zwischen die Schmalseiten in bezug auf zwei Lamellen, die diese Bänder bilden, gelötet sind, dadurch gekennzeichnet, dass die äusseren Enden dieser Leiter (9, 10) direkt - mit elektrischem Kontakt - mit den Verbindungsblocks (11, 12) verbunden sind, ohne wenigstens eines (16) der äusseren Enden des Kühlkanales von der oder den Zusatzkühlmittelspiralen, welche letztere an den entsprechenden Verbindungsblock (11 oder 12) durch die Zwischenschaltung einer Isoliermuffe (17), die einen Kurzschluss der Sekundärwicklung (6) verhindert, verbunden ist.
5. Transformator nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Verbindung zwischen den Verbindungsblocks (11, 12) und der äusseren Enden der Wicklungen (6) des Sekundärkreises einerseits und der äusseren Enden (mit Ausnahme von einem) des Kühlkreises andererseits durch Löten oder Schweissen vorgenommen ist, wobei die Blocks andererseits in einem synthetischen Polymerharz eingegossen sind, welches die Knoten (18) der Spulen umgibt.
EP83401128A 1982-06-08 1983-06-03 Transformator, insbesondere zum Herabtransformieren von Spannungen für Elektroschweissgerät Expired EP0099274B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401128T ATE23233T1 (de) 1982-06-08 1983-06-03 Transformator, insbesondere zum herabtransformieren von spannungen fuer elektroschweissgeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8209967 1982-06-08
FR8209967A FR2528224B1 (fr) 1982-06-08 1982-06-08 Transformateur, notamment abaisseur de tension pour machine a souder electrique

Publications (2)

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

Family

ID=9274761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401128A Expired EP0099274B1 (de) 1982-06-08 1983-06-03 Transformator, insbesondere zum Herabtransformieren von Spannungen für Elektroschweissgerät

Country Status (7)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315836A1 (de) * 1983-04-30 1984-10-31 Dornier System Gmbh, 7990 Friedrichshafen Vorrichtung zur kuehlung elektromagnetischer spulen
US5097241A (en) * 1989-12-29 1992-03-17 Sundstrand Corporation Cooling apparatus for windings
EP0823767A1 (de) * 1996-08-07 1998-02-11 SUMITOMO WIRING SYSTEMS, Ltd. Ladesystem für elektrisches Fahrzeug
US20090322460A1 (en) * 2008-06-25 2009-12-31 Lin Hsun-I High-frequency switching-type direct-current rectifier
JP6527931B1 (ja) * 2017-12-18 2019-06-12 株式会社三社電機製作所 水冷式変圧器
TWI708272B (zh) * 2020-02-24 2020-10-21 飛宏科技股份有限公司 具導熱結構之磁性裝置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1130780A (de) * 1957-02-12
GB812162A (en) * 1956-03-20 1959-04-22 Ferranti Ltd Improvements relating to electrical transformers
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 (de) * 1934-06-24 1940-01-08 Aeg Transformator ohne Kessel
US2577825A (en) * 1946-02-04 1951-12-11 Ohio Crankshaft Co Transformer
US2579522A (en) * 1946-02-04 1951-12-25 Ohio Crankshaft Co Transformer construction
US2770785A (en) * 1953-01-29 1956-11-13 Raytheon Mfg Co Directly-cooled electromagnetic components
CH368541A (de) * 1959-02-02 1963-04-15 Schlatter Ag Transformator
US3137830A (en) * 1961-08-17 1964-06-16 Kirkhof Mfg Corp Coolant transfer structure for transformers
FR1513090A (fr) * 1966-05-07 1968-02-09 Aeg Elotherm Gmbh Transformateur en forme de disque
FR1488462A (fr) * 1966-06-23 1967-07-13 Siemens Ag Transformateur de soudage refroidi à l'eau
US3659239A (en) * 1970-03-12 1972-04-25 Louis L Marton Power transformer incorporating improved heat dissipation means
JPS5534633B2 (de) * 1975-02-20 1980-09-08
US4039990A (en) * 1975-10-01 1977-08-02 General Electric Company Sheet-wound, high-voltage coils
DE2642216C2 (de) * 1976-09-20 1982-04-15 Messwandler-Bau Gmbh, 8600 Bamberg Spannungstransformator mit stabförmigem Eisenkern zur Verwendung als Ankopplungstransformator für Netzwerke mit überlagerter Tonfrequenzspannung, insbesondere Rundsteueranlagen

Also Published As

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

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