EP0932168B1 - Transformateur coaxial - Google Patents

Transformateur coaxial Download PDF

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Publication number
EP0932168B1
EP0932168B1 EP99101281A EP99101281A EP0932168B1 EP 0932168 B1 EP0932168 B1 EP 0932168B1 EP 99101281 A EP99101281 A EP 99101281A EP 99101281 A EP99101281 A EP 99101281A EP 0932168 B1 EP0932168 B1 EP 0932168B1
Authority
EP
European Patent Office
Prior art keywords
coaxial
winding
primary
transformer
coaxial cable
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 - Lifetime
Application number
EP99101281A
Other languages
German (de)
English (en)
Other versions
EP0932168A2 (fr
EP0932168A3 (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
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler 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, the Potential separation of power converters in various industrial applications and can be used in traction technology.
  • a coaxial transformer This is generally understood to be a transformer in which inner and outer conductors a wound around a magnetic core coaxial cable, the primary winding or form the secondary winding.
  • a coaxial transformer has compared to a conventional transformer with tube or disc windings a good insulation between Primärund Secondary winding due to the electric field symmetry between inner and Outer conductor of the coaxial cable.
  • Another advantage is the relatively low influence due to the current displacement effect even with larger conductor cross sections Reason for the magnetic field symmetry in the cylindrical conductor layers of the Coaxial cable.
  • Another advantage is the low and reproducible leakage inductance, because the stray field only between inner and outer conductor and the conductors even occurs.
  • p.1257-1263 is a soft switching power converter known in which a coaxial transformer on the one hand is used for potential separation and on the other hand for voltage adjustment.
  • a coaxial transformer on the one hand is used for potential separation and on the other hand for voltage adjustment.
  • This embodiment is at least one of the two conductors of the coaxial cable segmented, so that except the otherwise possible transmission ratio of 1: 1 also other integer ratios can be adjusted.
  • US-A-3 717 808 describes a coaxial cable transformer with a Coaxial cable enclosing a core in one turn.
  • the coaxial cable has three conductors, of which two conductors are the primary winding and the Form secondary winding.
  • the document describes the Coaxial transformer based on an equivalent circuit diagram, the actual constructive structure of the transformer, in particular the design of the Connections, however, is not described.
  • the invention has for its object to provide a coaxial transformer of the above mentioned type with very good electrical isolation between primary and Secondary connection, which is suitable for very high performance, a low Has volume and is inexpensive to produce.
  • a coaxial transformer with a Solved primary and secondary winding coaxial cable at least one Core of suitable material encloses the windings and each end of the coaxial cable is provided with a cable termination, which is the two conductors of Connect a coaxial cable to a primary terminal and a secondary terminal, ensure electrical insulation and control the electric field.
  • the achievable with the present invention consist in particular that the proposed, for power over 1 MW suitable transformer very high insulation requirements for example, 50 kV with high power density filled with solid insulating material.
  • the high power density leads to a cost-effective, relatively light and requiring only small space transformer.
  • the dispersion of the transformer is very low and exactly defined, so that they Even with series production without additional effort is very accurate reproducible. This is particularly true when operated at a constant switching frequency resonant converters Of great importance as the reactive elements of the resonant circuit then allowed to have only small tolerances.
  • connection side is open. This facilitates the electrical insulation and helps to create a transformer with very little To create dimensions.
  • a first variant of the coaxial transformer is shown.
  • a central winding block 16 an electrically insulating material to recognize, which with recesses for Guiding the individual turns of the winding and the core is provided.
  • the Windings (primary winding, secondary winding) are through a coaxial cable 17th formed, which encloses the winding block 16 with a plurality of turns.
  • the winding may be single-layered or multi-layered, with the advantage the precisely defined and thus reproducible inductance or scattering also at multilayer windings is given.
  • the coaxial cable 17 a hollow-walled cylindrical inner conductor 18, which by means of a Dielectric 19 is separated from the likewise cylindrical outer conductor 20.
  • the dielectric 19 is preferably for defined control of the electric field on its two cylinder jacket surfaces with an electrically semiconducting Material 27 connected. This allows air cavities between the primary and secondary side even with large temperature fluctuations and heavy load fluctuations be avoided altogether.
  • the outer conductor 20 is of an electrically insulating and mechanically protective jacket 7 covered.
  • a standard manufactured and therefore inexpensive coaxial cable used become.
  • Each of the two ends of the coaxial cable 17 is provided with a cable end closure 8 Provided.
  • the completely maintenance-free cable terminations 8 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 terminal, the control of the electric field and the electrical insulation.
  • the inner conductor 18 of the coaxial cable 17 preferably forms the primary winding of the Transformers and is connected at each end to a primary terminal 9.
  • 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 terminal 10 connected.
  • the fixation of 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 other coaxial cables, not shown be connected, which the other electrical wiring within a Plant, for example, within an electric rail vehicle accomplish.
  • auxiliary windings can be wrapped around by the coaxial cable formed winding to be wound. This is due to the exception of the connection side at no point open winding completely problem-free.
  • the winding formed from the coaxial cable 17 preferably has in this embodiment the shape of an oval hollow cylinder. This can be the minimum allowed Bending radius of the cable can be ensured.
  • the two are directly opposite straight sections of this oval hollow cylinder are each from a Core 12 of suitable core material (e.g., iron ribbon or ferrite) enclosed.
  • Each of the two halves of the core 12 can easily consist of several individual Cores which are magnetically connected in parallel, are manufactured. So one simple assembly of the core / winding arrangement is possible, the cores are preferably cut to use. In this way can also reproducibility the main inductance of the transformer by the introduction of a Air gap can be ensured.
  • the split cores 12 become, for example compressed by means along the outer jacket extending steel straps.
  • the core 12 easily to any potential, for example be set to ground potential.
  • Fig. 2 (side view in the upper section and top view in the lower section) is additionally a mounting device for the variant shown in Fig. 1 of the coaxial transformer shown.
  • the winding frame 16 with the wound coaxial cable 17, the core 12 and the two serving for the connection To detect cable terminations 8.
  • the winding frame 16 At the winding frame 16 are at both End plates 13 provided, which for vibration-proof and space-saving attachment of the transformer within a housing are suitable.
  • the inner conductor 18 of the coaxial cable 17 is in forced cooling for guiding the Coolant (for example, water or compressed air) used. It serves, for example the one primary connection as coolant inlet and the other primary connection of the Coaxial cable as coolant drain.
  • Coolant for example, water or compressed air
  • the inner conductor 18 of the coaxial cable 17 is in forced cooling for guiding the Coolant (for example, water or compressed air) used. It serves, for example the one primary connection as coolant inlet and the other primary connection of the Coaxial cable as coolant drain.
  • the transformer can at least in the region of the core be partially filled with a good thermal conductivity casting, which the Core 12 partially surrounds and run in which Kuhlstoffkanäle or radiator are introduced.
  • Fig. 3 in the left section, a view from above, in the lower section of a Side view and in the middle section a view on the front side
  • Fig. 3 in the left section, a view from above, in the lower section of a Side view and in the middle section a view on the front side
  • a total of six modules 1 to 6 (the coaxial transformer according to Figure 2 represents such a module is) connected so that a transformer with a gear ratio of 1: 3 results. All primary connections 9 with The modules marked 1 to 6 are connected via connecting bridges 28 in FIG Series switched.
  • the terminal 21 thus provides the outer formed thereby Primary-side main connection of the modular transformer. Secondary side are the terminals 10 of the modules 1 to 3 and the terminals 10 of the modules. 4 to 6 connected via connecting bridges 29 each in parallel. Subsequently, the Once again, two new winding connections are connected in series.
  • Terminal 22 represents the outer secondary side formed thereby Main connection of the modular transformer.
  • Fig. 4 shows for clarity the adjusting primary and secondary voltage conditions in the upper section on the basis of a detailed representation of the mechanical arrangement of Figure 3 and in the lower section on the basis of an electrical equivalent circuit diagram.
  • the outer primary voltage with u P (t) the outer secondary voltage with u S (t)
  • the primary voltages of the modules 1 to 6 with u P1 (t) to u P6 (t) the secondary voltages of the modules 1 to 6 with u S1 (t) to u S6 (t).
  • FIG. 5 shows a second variant of the proposed transformer design, in particular also for a modular construction with e.g. a big one common core 12 is suitable for all modules.
  • the individual modules are simply on the common core 12 mounted and e.g. by crosses into corresponding holes of the winding block 16 Screw connections 31 fixed.
  • An assembly device (plates 13), as in FIG. 3 shown is not essential.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Transformers For Measuring Instruments (AREA)

Claims (5)

  1. Transformateur coaxial muni d'un câble coaxial (17) à deux conducteurs (18, 20) formant un enroulement primaire et secondaire, au moins une âme (12) entourant les enroulements et les deux conducteurs (18, 20) étant reliés à chaque extrémité du câble coaxial avec une borne primaire (9) et une borne secondaire (10), caractérisé en ce que le câble coaxial (17) est muni à chaque extrémité d'une cosse pour câble (8), lesquelles relient les deux conducteurs (18, 20) du câble coaxial avec la borne primaire (9) et la borne secondaire (10), assurent l'isolation électrique et commandent le champ électrique.
  2. Transformateur coaxial selon la revendication 1, caractérisé en ce qu'un bloc d'enroulement (16) sert à guider le câble coaxial (17).
  3. Transformateur coaxial selon la revendication 1 et/ou 2, caractérisé en ce que le conducteur interne (18) tubulaire du câble coaxial (17) sert à la circulation d'un fluide de refroidissement.
  4. Transformateur coaxial selon l'une des revendications précédentes 1 à 3, caractérisé en ce que plusieurs enroulements formant à chaque fois un enroulement primaire et secondaire et munis de cosses pour câble (8) sont prévus, un branchement en série et/ou en parallèle des enroulements primaires et/ou des enroulements secondaires individuels étant effectué à l'aide de cavaliers de liaison (28, 29) et il se forme une borne primaire extérieure (21) et une borne secondaire extérieure (22) communes de l'arrangement modulaire.
  5. Transformateur coaxial selon la revendication 4, caractérisé par une âme commune pour tous les enroulements de l'arrangement modulaire.
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 EP0932168A2 (fr) 1999-07-28
EP0932168A3 EP0932168A3 (fr) 2000-05-31
EP0932168B1 true 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)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10058080A1 (de) * 2000-11-23 2002-06-06 Daimlerchrysler Rail Systems Mittelfrequenztransformator
WO2004090919A1 (fr) * 2003-04-07 2004-10-21 Jens Gorm Stubbe Olsen Transformateur rotatif
EP2639800B1 (fr) * 2012-03-14 2014-10-15 Siemens Aktiengesellschaft Transformateur pour un véhicule entraîné électriquement
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
WO2017201202A1 (fr) * 2016-05-17 2017-11-23 Georgia Tech Research Corporation Module d'optimisation de tension isolée empilable

Family Cites Families (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
JPH0241852Y2 (fr) * 1985-03-20 1990-11-08
US5341083A (en) * 1991-09-27 1994-08-23 Electric Power Research Institute, Inc. Contactless battery charging system
DE4318270A1 (de) * 1993-06-02 1994-12-08 Zielinski Adolf Herbert Astor Koaxialer Transformator, Arbeitsweise und Einrichtung zur elektromagnetischen Transformation von Energie

Also Published As

Publication number Publication date
EP0932168A2 (fr) 1999-07-28
DE59904681D1 (de) 2003-04-30
DE19802760A1 (de) 1999-07-29
EP0932168A3 (fr) 2000-05-31

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