EP0099274A1 - 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
EP0099274A1
EP0099274A1 EP83401128A EP83401128A EP0099274A1 EP 0099274 A1 EP0099274 A1 EP 0099274A1 EP 83401128 A EP83401128 A EP 83401128A EP 83401128 A EP83401128 A EP 83401128A EP 0099274 A1 EP0099274 A1 EP 0099274A1
Authority
EP
European Patent Office
Prior art keywords
cooling
turns
winding
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.)
Granted
Application number
EP83401128A
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English (en)
French (fr)
Other versions
EP0099274B1 (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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    • 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 pincipe traversed by currents of high intensity.
  • 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 refrigerant circulates, and incorporated, for example by being brazed, between two juxtaposed parts of the copper strip and, where appropriate of aluminum, wrapped around the core and constituting the turn (s) of the secondary circuit, and this according to all appropriate technological modalities.
  • a transformer according to the invention in particular step-down for electric welding machine, is essentially characterized in that it comprises one or more cooling turns inside which circulates a cooling fluid, incorporated or interposed in the primary and / or secondary windings and separating them into several parts by being in thermal contact with them, this or these turns being electrically inactive, having only one role of cooling - and not being part of the electrical circuits of said windings.
  • the number of sections or parts into 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 turn re - chilling, since the multiplication of inactive cooling turns (not constituting a part of the electrical circuit) does not cause 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 quite 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, can also be characterized in that it comprises on the one hand a certain number-function of the ratio of desired transformation-active Wegssantes turns constituting the circuit secondary, and secondly a number depending on the degree-of-additional desired kaussantes of cooling coils or turns dead electrically inactive, having only a cooling function and not part from the secondary circuit, all or part of all of these active turns and additional turns dividing the winding of the primary circuit into sections.
  • 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 an adequate source of coolant (for example water).
  • 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 ooaxial.
  • the sections 4b and 4c are separated by the two active turns, themselves separated by an electrical insulator 5, from a copper strip 6 coaxially wound on the 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 different arrangements of the primary and secondary windings have been shown as variants, the production of the different connections possibly also being of the same type as the one 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 intercalation of two turns, isolated from one another, 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 temperature distribution according to 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 joined strips, which facilitates their folding 31 towards the connection at the ends proper from 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.
  • 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)
  • Regulation Of General Use Transformers (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Dc-Dc Converters (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
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
FR8209967A FR2528224B1 (fr) 1982-06-08 1982-06-08 Transformateur, notamment abaisseur de tension pour machine a souder electrique
FR8209967 1982-06-08

Publications (2)

Publication Number Publication Date
EP0099274A1 true EP0099274A1 (de) 1984-01-25
EP0099274B1 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
EP0982832A3 (de) * 1996-08-07 2000-08-09 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

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB284774A (en) * 1926-11-03 1928-02-03 Neville Ryland Davis Improvements in or relating to fluid cooled conductors for alternating electric currents
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
FR1130780A (de) * 1957-02-12
GB812162A (en) * 1956-03-20 1959-04-22 Ferranti Ltd Improvements relating to electrical transformers
US3137830A (en) * 1961-08-17 1964-06-16 Kirkhof Mfg Corp Coolant transfer structure for transformers
FR1488462A (fr) * 1966-06-23 1967-07-13 Siemens Ag Transformateur de soudage refroidi à l'eau
FR2085609A2 (de) * 1970-03-12 1971-12-24 Marton Louis

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1394044A (en) * 1919-03-25 1921-10-18 Gen Electric Water-cooled transformer
DE686380C (de) * 1934-06-24 1940-01-08 Aeg Transformator ohne Kessel
CH368541A (de) * 1959-02-02 1963-04-15 Schlatter Ag Transformator
FR1513090A (fr) * 1966-05-07 1968-02-09 Aeg Elotherm Gmbh Transformateur en forme de disque
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

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1130780A (de) * 1957-02-12
GB284774A (en) * 1926-11-03 1928-02-03 Neville Ryland Davis Improvements in or relating to fluid cooled conductors for alternating electric currents
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
GB812162A (en) * 1956-03-20 1959-04-22 Ferranti Ltd Improvements relating to electrical transformers
US3137830A (en) * 1961-08-17 1964-06-16 Kirkhof Mfg Corp Coolant transfer structure for transformers
FR1488462A (fr) * 1966-06-23 1967-07-13 Siemens Ag Transformateur de soudage refroidi à l'eau
FR2085609A2 (de) * 1970-03-12 1971-12-24 Marton Louis

Also Published As

Publication number Publication date
FR2528224B1 (fr) 1985-06-21
DE3367299D1 (en) 1986-12-04
US4543552A (en) 1985-09-24
EP0099274B1 (de) 1986-10-29
ES522994A0 (es) 1984-03-01
ATE23233T1 (de) 1986-11-15
JPS58216408A (ja) 1983-12-16
ES8402674A1 (es) 1984-03-01
FR2528224A1 (fr) 1983-12-09

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