EP0601225A1 - Transformateur pour le transfert de hautes puissances électriques à fréquence élevée - Google Patents

Transformateur pour le transfert de hautes puissances électriques à fréquence élevée Download PDF

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Publication number
EP0601225A1
EP0601225A1 EP92120854A EP92120854A EP0601225A1 EP 0601225 A1 EP0601225 A1 EP 0601225A1 EP 92120854 A EP92120854 A EP 92120854A EP 92120854 A EP92120854 A EP 92120854A EP 0601225 A1 EP0601225 A1 EP 0601225A1
Authority
EP
European Patent Office
Prior art keywords
transformer
conductor
cup part
transformer according
cup
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.)
Withdrawn
Application number
EP92120854A
Other languages
German (de)
English (en)
Inventor
Gerhard Dipl.-Ing. Fischer (Fh)
Bernhard Dipl.-Ing. Hemmer
Dusan Kisel
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.)
FISCHER, GERHARD
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP92120854A priority Critical patent/EP0601225A1/fr
Publication of EP0601225A1 publication Critical patent/EP0601225A1/fr
Withdrawn legal-status Critical Current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
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal transformers

Definitions

  • the invention relates to a transformer for transmitting high electrical power at high frequency with a first turn consisting of two mutually parallel and one-sidedly connected sections of a tubular first conductor, with a second turn consisting of an inside of the tubular first conductor, coaxial with this second conductor and with an annular transformer core which is arranged coaxially to the two conductors.
  • Such a transformer known from "IEEE Transactions on Power Electronics", Vol. 7, No. 1, 1992, pages 54-62, is used to transmit power in the order of 50 kilowatts at a frequency of 50 kilohertz, for example in DC converters.
  • magnetic stray fields in particular contribute to the generation of iron and copper losses.
  • the known transformer has a coaxial winding structure and the use of ferrites or permalloy as the material for the transformer core.
  • two parallel pipe sections made of copper are bent on one side via a semicircular one Pipe piece or a rod-shaped connecting piece connected to one another in such a way that they form a U-shaped primary turn of the transformer.
  • the secondary winding of the transformer consists of a wire strand, which is arranged in one or more closed turns, with mutually opposite turn sections running inside the two pipe sections.
  • Several ring cores made of ferrite or amorphous metal are also pushed onto the pipe sections.
  • the invention is therefore based on the object of enabling effective cooling of the transformer core in a transformer with a coaxial winding structure and at the same time achieving a construction that is even simpler in terms of construction and more economical in terms of losses.
  • the object is achieved in that in the transformer of the type mentioned, the parallel tube sections of the first conductor have different diameters, are arranged coaxially to one another and are connected to one another via a disk-shaped base part to form a first cup part, that the second conductor an inner conductor and an outer tube coaxially surrounding this, which are connected to one another via a disk-shaped further base part to form a second cup part, that the inner diameter of the inner tube section of the first conductor is larger than the outer diameter of the inner conductor of the second conductor, that the outer diameter of the outer tube section of the first conductor is smaller than the inner diameter of the outer tube of the second conductor, that the first cup part is arranged inside the second cup part and that the transformer core is arranged inside the first cup part.
  • the two turns of the transformer are cup-shaped, it is possible to fill them with a cooling medium for the transformer core.
  • the cup parts can also be other, e.g. B. have elliptical or rectangular cross sections.
  • the structural design of the transformer according to the invention is also particularly simple, which is particularly evident in the fact that the windings designed as cup parts and the transformer core can be put together to form the transformer by simple, successive joining from a single mounting side, namely the open cup side.
  • the first, inner cup part with a cooling medium, preferably a liquid such. B. oil filled.
  • the second, outer cup part can advantageously be connected via an inlet and an outlet to a secondary coolant circuit, by means of which the lost heat absorbed by the cooling medium in the first cup part can be dissipated.
  • both cup parts are filled with the cooling medium, the first, inner cup part containing passage openings, so that a convection flow of the cooling medium is possible through both cup parts.
  • the heat loss is dissipated via the outer wall of the second, outer cup part.
  • means for heat dissipation are preferably attached to the outer tube of the second cup part.
  • This can be passive agents such as cooling fins or active agents such as. B. act coolant-flowed cooling coils.
  • the dissipation of the heat loss can also be supported by the fact that the inner conductor of the second, outer cup part is tubular.
  • the outer surface of the second container part that can be used for heat dissipation is further increased; since the current flow is displaced to the outer circumference of the round inner conductor due to the high operating frequencies, the ohmic resistance of the inner conductor is not increased by this measure.
  • the transformer core is preferably formed from toroidal cores which are superimposed on one another in the transformer according to the invention and, for example, by disc-shaped intermediate layers are isolated from each other.
  • the toroidal cores can be circular or z. B. also rectangular and in one piece or in several pieces, for example composed of U-shaped parts.
  • the transformer core is preferably made of ferrite or amorphous metal.
  • At least one further turn is provided, which is designed in the form of an additional cup part which is coaxial with the first and second cup parts.
  • the transformer according to the invention can advantageously be arranged with other similar transformers to form a transformer battery similarly known capacitor banks, the transformers being connected to one another on their open sides by busbars.
  • the transformer according to the invention can also be assembled together with other similar transformers to form a multiphase transformer.
  • the transformer shown in FIG. 1 essentially consists of a first, primary winding 1, a second, secondary winding 2 and a transformer core 3.
  • the first, primary winding 1 consists of two pipe sections 4 and 5 of different diameters arranged coaxially to one another, which are connected on one side at the bottom via an annular disk-shaped base part 6 and thereby form a first cup part 7.
  • primary connecting lines 8 and 9 are attached to the two pipe sections 4 and 5.
  • the second, secondary winding 2 also consists of a tubular inner conductor 10 with a smaller outer diameter than the inner diameter of the inner tube section 4 of the first winding 1 and a coaxial outer tube 11 with a larger inner diameter than the outer diameter of the outer tube section 5, the inner conductor 10 and the outer tube 11 are connected on one side at the bottom via a disk-shaped further base part 12 to form a second cup part 13. On the upwardly open side of the second cup part 13, secondary connecting lines 14 and 15 are connected to the inner conductor 10 and the outer tube 11.
  • the first cup part 7 forming the primary turn 1 is placed in the second cup part 13 forming the secondary turn 2, with spacers 16 made of insulating material holding the two cup parts 7 and 13 apart and in coaxial alignment with one another.
  • the turns 1 and 2 consist of copper.
  • the transformer is designed for a power transmission of approximately 50 kilowatts at an operating frequency of 400 to 500 kilohertz and, due to its 1: 1 ratio, is primarily used for potential isolation, for example in devices for induction heating. Due to the completely rotationally symmetrical structure, there are only minor losses in power transmission, these losses are also evenly distributed over the transformer so that no local heat islands arise.
  • the formation of the windings 1 and 2 as cup parts 7 and 13 and their filling with the cooling medium 20 ensures effective dissipation of the heat loss generated in the transformer core 3 via the outer wall of the second, outer cup part 13 to the environment.
  • the individual parts of the transformer can be easily assembled from a single side.
  • the exemplary embodiment shown schematically in FIG. 2 for the transformer according to the invention differs from the example shown in FIG. 1 by a further primary winding 21, which is likewise designed as a cup part 22 and is arranged between the cup parts 7 and 13.
  • the turns 1 and 21 are connected in series in such a way that the primary connecting line, designated 9, is not connected to the outer tube section 5 of the cup part 7 but to the outer tube section 23 of the cup part 22 and that the inner tube section 24 of the cup part 22 is connected via a connecting line 25 to the outer tube section 5 of the cup part 7.
  • This transformer thus has a transmission ratio of 1: 2, the same advantages as in the exemplary embodiment shown in FIG. 1 due to the still completely rotationally symmetrical structure.
  • the heat loss generated in the transformer core is dissipated to the environment through the cooling medium 20 and the wall of the outer second cup part 13. As shown in FIG. 3 shows, the dissipation of the heat loss can be improved by the fact that on the outer cup part 13 a cooling coil 26 of a coolant circuit not shown in the rest is present.
  • FIG. 4 shows an example of the interconnection of three transformers 27, 28 and 29 of the type according to the invention to form a transformer battery similar to a capacitor bank, the respective primary windings 30, 31 and 32 being connected in series and in the same way also the secondary windings 33, 34 and 35 are connected in series.
  • a parallel connection of turns is of course also possible.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP92120854A 1992-12-07 1992-12-07 Transformateur pour le transfert de hautes puissances électriques à fréquence élevée Withdrawn EP0601225A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92120854A EP0601225A1 (fr) 1992-12-07 1992-12-07 Transformateur pour le transfert de hautes puissances électriques à fréquence élevée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92120854A EP0601225A1 (fr) 1992-12-07 1992-12-07 Transformateur pour le transfert de hautes puissances électriques à fréquence élevée

Publications (1)

Publication Number Publication Date
EP0601225A1 true EP0601225A1 (fr) 1994-06-15

Family

ID=8210285

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92120854A Withdrawn EP0601225A1 (fr) 1992-12-07 1992-12-07 Transformateur pour le transfert de hautes puissances électriques à fréquence élevée

Country Status (1)

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EP (1) EP0601225A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875908A1 (fr) * 1995-12-28 1998-11-04 Suzhen Hu Transformateur a haute frequence
AU2004201441B2 (en) * 2003-07-11 2006-02-02 Lincoln Global, Inc. Transformer Module for a Welder
US7274000B2 (en) 2003-07-11 2007-09-25 Lincoln Global, Inc. Power source for high current welding
EP2083390A1 (fr) 2008-01-24 2009-07-29 BrainLAB AG Procédé destiné à la segmentation d'un ensemble de données d'image en 3D, produit de programme informatique correspondant et système correspondant
US7573000B2 (en) 2003-07-11 2009-08-11 Lincoln Global, Inc. Power source for plasma device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE922839C (de) * 1952-05-10 1955-01-27 Brown Ag Hochstrom-Transformator
FR1330315A (fr) * 1962-05-11 1963-06-21 Materiel Electrique S W Le Bobinage pour circuit magnétique non ouvert
DE2115574A1 (de) * 1971-03-31 1972-10-12 Aeg Elotherm Gmbh Elektromagnetische Vorrichtung, ins besondere für Mittelfrequenz
DE3928223A1 (de) * 1988-08-25 1990-03-01 Hitachi Metals Ltd Magnetische einrichtung fuer eine hochspannungsimpulsgeneratorvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE922839C (de) * 1952-05-10 1955-01-27 Brown Ag Hochstrom-Transformator
FR1330315A (fr) * 1962-05-11 1963-06-21 Materiel Electrique S W Le Bobinage pour circuit magnétique non ouvert
DE2115574A1 (de) * 1971-03-31 1972-10-12 Aeg Elotherm Gmbh Elektromagnetische Vorrichtung, ins besondere für Mittelfrequenz
DE3928223A1 (de) * 1988-08-25 1990-03-01 Hitachi Metals Ltd Magnetische einrichtung fuer eine hochspannungsimpulsgeneratorvorrichtung

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875908A1 (fr) * 1995-12-28 1998-11-04 Suzhen Hu Transformateur a haute frequence
EP0875908A4 (fr) * 1995-12-28 1999-03-10 Suzhen Hu Transformateur a haute frequence
US6078239A (en) * 1995-12-28 2000-06-20 Suzhen Hu High frequency transformer
AU2004201441B2 (en) * 2003-07-11 2006-02-02 Lincoln Global, Inc. Transformer Module for a Welder
US6998573B2 (en) 2003-07-11 2006-02-14 Lincoln Global, Inc. Transformer module for a welder
AU2004201441B9 (en) * 2003-07-11 2006-08-10 Lincoln Global, Inc. Transformer Module for a Welder
US7274000B2 (en) 2003-07-11 2007-09-25 Lincoln Global, Inc. Power source for high current welding
US7573000B2 (en) 2003-07-11 2009-08-11 Lincoln Global, Inc. Power source for plasma device
US7796005B2 (en) 2003-07-11 2010-09-14 Lincoln Global, Inc. Power source for plasma device
EP2083390A1 (fr) 2008-01-24 2009-07-29 BrainLAB AG Procédé destiné à la segmentation d'un ensemble de données d'image en 3D, produit de programme informatique correspondant et système correspondant

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