EP0932168A2 - Transformateur coaxial - Google Patents

Transformateur coaxial Download PDF

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Publication number
EP0932168A2
EP0932168A2 EP99101281A EP99101281A EP0932168A2 EP 0932168 A2 EP0932168 A2 EP 0932168A2 EP 99101281 A EP99101281 A EP 99101281A EP 99101281 A EP99101281 A EP 99101281A EP 0932168 A2 EP0932168 A2 EP 0932168A2
Authority
EP
European Patent Office
Prior art keywords
coaxial
primary
connection
transformer
windings
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
EP99101281A
Other languages
German (de)
English (en)
Other versions
EP0932168A3 (fr
EP0932168B1 (fr
Inventor
Lothar Dr.-Ing. Heinemann
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.)
Mercedes Benz Group AG
Original Assignee
ABB Daimler Benz Transportation Schweiz AG
DaimlerChrysler AG
ABB Daimler Benz Transportation Technology GmbH
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 ABB Daimler Benz Transportation Schweiz AG, DaimlerChrysler AG, ABB Daimler Benz Transportation Technology GmbH filed Critical ABB Daimler Benz Transportation Schweiz AG
Publication of EP0932168A2 publication Critical patent/EP0932168A2/fr
Publication of EP0932168A3 publication Critical patent/EP0932168A3/fr
Application granted granted Critical
Publication of EP0932168B1 publication Critical patent/EP0932168B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads
    • 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
    • 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
    • H01F27/2823—Wires
    • H01F2027/2833—Wires using coaxial cable as wire

Definitions

  • the invention relates to a coaxial transformer, for example for Electrical isolation of converters in various industrial applications and can be used in traction technology.
  • a coaxial transformer is generally understood to be a transformer in which inner and outer conductors of a coaxial cable wound around a magnetic core, the primary winding or form the secondary winding.
  • a coaxial transformer shows compared to a conventional transformer with tube or disc windings, good insulation ability between primary and secondary winding due to the electrical field symmetry between indoor and outer conductor of the coaxial cable.
  • the relatively small influence is also advantageous due to the current displacement effect even with larger conductor cross sections Because of the magnetic field symmetry in the cylindrical conductor layers of the Coaxial cable.
  • Another advantage is the low and reproducible leakage inductance, since the stray field is only between the inner and outer conductors and the conductors itself occurs. After all, there is also a high power density and inexpensive Given assembly.
  • the transformer for example, soft switching converter with a switching frequency of, for example, 20 kHz and larger transmissible powers (far more than 100 kW) with high at the same time Currents and high insulation requirements (up to e.g. 50 kV). Is conceivable but also an application at mains frequency.
  • the invention has for its object a coaxial transformer of the beginning mentioned type with very good electrical insulation ability between primary and Specify secondary connection that is suitable for very high outputs, a low one Has volume and is inexpensive to manufacture.
  • a coaxial transformer with a Solved primary and secondary winding coaxial cable at least one Appropriate material core that wraps around the windings and each end of the coaxial cable is provided with a cable end closure, which the two conductors of the Connect the coaxial cable to a primary connection and a secondary connection, ensure electrical insulation and control the electrical field.
  • the advantages that can be achieved with the invention are, in particular, that the proposed transformer, suitable for outputs over 1 MW, very high insulation requirements of, for example, 50 kV with a high power density at the same time met with solid insulating material.
  • the high power density leads to an inexpensive, relatively light and requiring little space transformer.
  • the spread of the transformer is very small and precisely defined, so that it can be reproduced very precisely even in series production without additional effort. This is particularly the case with resonant converters operated at a constant switching frequency of great importance since the reactive elements of the resonant circuit then only have small tolerances.
  • the high Potential is only open on one side, the connection side. This makes it easier the electrical insulation and helps make a transformer with very low To create dimensions.
  • the electrical connections for the primary and secondary side directly next to each other and can be through the cable terminations separate very easily what is the desired very low leakage inductance and low-impedance connection to the neighboring power semiconductors.
  • FIG. 1 shows a first variant of the coaxial transformer.
  • a central winding block 16 to recognize an electrically insulating material which with recesses for Guide the individual turns of the winding and the core is provided.
  • the Windings are by a coaxial cable 17th formed, which surrounds the winding block 16 with several turns.
  • the winding can be formed in one or more layers, the advantage the precisely defined and thus reproducible inductance or scattering multilayer windings is given.
  • the dielectric 19 is preferred for the defined control of the electrical field on its two cylindrical surfaces with an electrically semiconducting Material 27 connected. This can create air voids between the primary and secondary side even with large temperature fluctuations and strong load fluctuations to be avoided entirely.
  • the outer conductor 20 is of an electrically insulating type and mechanically protective jacket 7 covered. One can be advantageous standard manufactured and therefore inexpensive coaxial cable used become.
  • Each of the two ends of the coaxial cable 17 is with a cable end closure 8 Mistake.
  • the completely maintenance-free cable terminations 17 serve the current-carrying Connection between the one conductor of the coaxial cable and the primary connection and between the other conductor of the coaxial cable and the secondary connection, the control of the electrical field and the electrical insulation.
  • the inner conductor 18 of the coaxial cable 17 preferably forms the primary winding of the Transformer and is connected to a primary terminal 9 at each end.
  • Of the Outer conductor 20 of the coaxial cable 17 forms the secondary winding of the transformer and is at each end with a preferably large-area secondary connection 10 connected. Fixing the coaxial cable for the purpose of parallel Design of the winding connections is made possible by a spacer 11.
  • Both the two primary connections and the two secondary connections can in a simple and expedient manner with further coaxial cables, not shown be connected, which the further electrical wiring within a System, for example within an electric rail vehicle.
  • auxiliary windings can be wrapped around the coaxial cable formed winding are wound. This is due to the exception of the connection side nowhere open winding without any problems.
  • the winding formed from the coaxial cable 17 preferably has in this embodiment the shape of an oval hollow cylinder. This allows the minimum allowed Bending radius of the cable can be guaranteed.
  • the two directly opposite each other straight sections of this oval hollow cylinder are each one Core 12 enclosed in a suitable core material (e.g. iron band or ferrite).
  • a suitable core material e.g. iron band or ferrite.
  • Each of the two halves of the core 12 can easily consist of several individual ones Cores that are magnetically connected in parallel are manufactured. So that one simple assembly of the core / winding arrangement is possible, the cores are preferred cut to use. In this way, reproducibility the main inductance of the transformer by introducing a Air gap can be guaranteed.
  • the core 12 can easily reach any potential, for example be "laid” on ground potential.
  • Fig. 2 (side view in the upper section and top view in the lower section) is also a mounting device for the variant shown in Fig. 1 of the coaxial transformer shown.
  • the winding block 16 with the wound coaxial cable 17, the core 12 and the two serving for connection Cable terminations 8 can be seen.
  • On the winding block 16 are on both Face plates 13 are provided, which for vibration-proof and space-saving attachment of the transformer are suitable within a housing.
  • the inner conductor 3 of the coaxial cable 2 is with forced cooling to guide the Coolant (e.g. water or compressed air). It serves, for example one primary connection as coolant inlet 14 and the other primary connection of the Coaxial cable as coolant drain 15.
  • Coolant e.g. water or compressed air
  • the transformer can at least in the area of the core partially filled with a thermally conductive potting, which the Core 12 partially encloses and in which coolant channels run or cooler are introduced.
  • a total of six modules 1 to 6 (the coaxial transformer according to Figure 2 represents such a module) connected so that a transformer with a gear ratio of 1: 3 results.
  • All primary connections 9 with the numbers 1 to 6 marked modules are via connecting bridges 28 in Series connected.
  • the terminal 21 thus represents the outer formed thereby primary connection of the modular transformer.
  • Secondary side are the connections 10 of the modules 1 to 3 and the connections 10 of the modules 4 to 6 each connected in parallel via connecting bridges 29. Then the two new winding connections that are set up in this way.
  • Terminal 22 represents the outer secondary side formed thereby Main connection of the modular transformer.
  • FIG. 4 shows the primary and secondary voltage relationships that arise in the upper section using a detailed representation of the mechanical arrangement according to FIG. 3 and in the lower section using an electrical equivalent circuit diagram.
  • a low-inductance and low-loss connection of the individual modules themselves To be able to guarantee at higher operating frequencies (e.g. 20 kHz) is - as in Figure 3 shown - a large-area railing of the connecting lines (see the connecting bridges 28, 29) advantageous.
  • the splint should be done so that the resulting in the parallel conductor pieces (connecting bridges) Currents are directed in opposite directions and are of equal magnitude. This is always fulfilled with the railing shown in FIG. 3.
  • Contacting the individual modules can always be in the proposed type of splinting done in the same way. In FIG. 3, this is shown by the connection contacts 23 (secondary side) and 24 (primary side) clarified.
  • FIG. 3 also shows that the selected busbars (connecting bridges) no additional insulation problem arises.
  • Primary and secondary sides Winding connections remain, as when using only one module, always at the same distance from each other.
  • the coolant is introduced through the connection 25. Leaves through port 26 the coolant finally returns to the cooling circuit.
  • it is also a parallel connection of all cooling connection pairs or a combination of series and parallel connection possible.
  • Figure 5 shows a second variant of the proposed transformer design, which in particular also for a modular structure with z.
  • a large one common core 12 is suitable for all modules.
  • the individual modules are simply set up on the common core 12 assembled and e.g. by reaching into corresponding bores of the winding block 16 Screw connections 31 fixed.
  • a mounting device (plates 13), as in Figure 3 shown is not absolutely necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)
EP99101281A 1998-01-26 1999-01-25 Transformateur coaxial Expired - Lifetime EP0932168B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19802760A DE19802760A1 (de) 1998-01-26 1998-01-26 Koaxialtransformator
DE19802760 1998-01-26

Publications (3)

Publication Number Publication Date
EP0932168A2 true EP0932168A2 (fr) 1999-07-28
EP0932168A3 EP0932168A3 (fr) 2000-05-31
EP0932168B1 EP0932168B1 (fr) 2003-03-26

Family

ID=7855633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99101281A Expired - Lifetime EP0932168B1 (fr) 1998-01-26 1999-01-25 Transformateur coaxial

Country Status (2)

Country Link
EP (1) EP0932168B1 (fr)
DE (2) DE19802760A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043085A1 (fr) * 2000-11-23 2002-05-30 Bombardier Transportation Gmbh Transformateur moyenne frequence
WO2004090919A1 (fr) * 2003-04-07 2004-10-21 Jens Gorm Stubbe Olsen Transformateur rotatif
EP2639800A1 (fr) * 2012-03-14 2013-09-18 Siemens Aktiengesellschaft Transformateur pour un véhicule entraîné électriquement
WO2017201202A1 (fr) * 2016-05-17 2017-11-23 Georgia Tech Research Corporation Module d'optimisation de tension isolée empilable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012016225A1 (de) 2012-08-14 2014-03-13 Jürgen Blum Elektro-Feldenergie auf der Basis von zweidimensionalen Elektronensystemen, mit der Energiemasse in dem koaxialen Leitungs- und Spulensystem des koaxialen Generators und Transformators

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3197723A (en) * 1961-04-26 1965-07-27 Ite Circuit Breaker Ltd Cascaded coaxial cable transformer
US3453574A (en) * 1968-03-22 1969-07-01 Atomic Energy Commission High-frequency,wide-band transformer
US3717808A (en) * 1971-05-19 1973-02-20 Communications Satellite Corp Shielded coaxial cable transformer
US4639707A (en) * 1985-03-20 1987-01-27 Allied Corporation Transformer with toroidal magnetic core
WO1994009544A1 (fr) * 1992-10-20 1994-04-28 Electric Power Research Institute Chargeur de batterie sans contact
DE4318270A1 (de) * 1993-06-02 1994-12-08 Zielinski Adolf Herbert Astor Koaxialer Transformator, Arbeitsweise und Einrichtung zur elektromagnetischen Transformation von Energie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3197723A (en) * 1961-04-26 1965-07-27 Ite Circuit Breaker Ltd Cascaded coaxial cable transformer
US3453574A (en) * 1968-03-22 1969-07-01 Atomic Energy Commission High-frequency,wide-band transformer
US3717808A (en) * 1971-05-19 1973-02-20 Communications Satellite Corp Shielded coaxial cable transformer
US4639707A (en) * 1985-03-20 1987-01-27 Allied Corporation Transformer with toroidal magnetic core
WO1994009544A1 (fr) * 1992-10-20 1994-04-28 Electric Power Research Institute Chargeur de batterie sans contact
DE4318270A1 (de) * 1993-06-02 1994-12-08 Zielinski Adolf Herbert Astor Koaxialer Transformator, Arbeitsweise und Einrichtung zur elektromagnetischen Transformation von Energie

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002043085A1 (fr) * 2000-11-23 2002-05-30 Bombardier Transportation Gmbh Transformateur moyenne frequence
WO2004090919A1 (fr) * 2003-04-07 2004-10-21 Jens Gorm Stubbe Olsen Transformateur rotatif
EP2639800A1 (fr) * 2012-03-14 2013-09-18 Siemens Aktiengesellschaft Transformateur pour un véhicule entraîné électriquement
WO2013135689A1 (fr) * 2012-03-14 2013-09-19 Siemens Aktiengesellschaft Transformateur pour un véhicule à propulsion électrique
WO2017201202A1 (fr) * 2016-05-17 2017-11-23 Georgia Tech Research Corporation Module d'optimisation de tension isolée empilable
US11159091B2 (en) 2016-05-17 2021-10-26 Georgia Tech Research Corporation Stackable isolated voltage optimization module

Also Published As

Publication number Publication date
EP0932168A3 (fr) 2000-05-31
EP0932168B1 (fr) 2003-03-26
DE19802760A1 (de) 1999-07-29
DE59904681D1 (de) 2003-04-30

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