EP2146403A1 - Transmetteur - Google Patents

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Publication number
EP2146403A1
EP2146403A1 EP08012676A EP08012676A EP2146403A1 EP 2146403 A1 EP2146403 A1 EP 2146403A1 EP 08012676 A EP08012676 A EP 08012676A EP 08012676 A EP08012676 A EP 08012676A EP 2146403 A1 EP2146403 A1 EP 2146403A1
Authority
EP
European Patent Office
Prior art keywords
liquid
rotary transformer
barrier
metal alloy
liquid metal
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
EP08012676A
Other languages
German (de)
English (en)
Other versions
EP2146403B1 (fr
Inventor
Günter Schwesig
Ulrich Wetzel
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.)
Siemens AG
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 EP08012676A priority Critical patent/EP2146403B1/fr
Publication of EP2146403A1 publication Critical patent/EP2146403A1/fr
Application granted granted Critical
Publication of EP2146403B1 publication Critical patent/EP2146403B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/30—Liquid contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/64—Devices for uninterrupted current collection
    • H01R39/646—Devices for uninterrupted current collection through an electrical conductive fluid

Definitions

  • the invention relates to a rotary transformer, wherein the rotary transformer has an electrically conductive first element and an electrically conductive second element, wherein the second element is arranged rotatably relative to the first element, wherein the first and the second element are arranged separated by a gap, wherein in the gap, an electrically conductive liquid metal alloy is arranged, which causes an electrically conductive connection between the first and second element.
  • a rotary transformer which allows based on an electrically conductive liquid metal alloy transmission of electrical current between the dormant system and the rotating system.
  • Gallium or indium compounds or a eutectic of the metal components gallium, indium and tin are usually used as the liquid metal alloy.
  • Liquid metal alloys have the disadvantage that they react strongly with oxygen and thereby adversely affect their properties, for example, the liquid metal can change its viscosity and / or adhesion upon reaction with oxygen and it can lead to clumping of the liquid metal alloy, which makes the rotary transformer useless.
  • the rotary transformer If the rotary transformer is to be used under ambient air conditions, the rotary transformer or at least parts of the rotary transformer must therefore very well against the penetration be sealed gas-tight from gaseous oxygen from the ambient air.
  • the technical realization of a very good gas-tight seal of a rotating element against a dormant element is technically very difficult to achieve.
  • a magnetically conductive liquid such as a ferrofluid based seal.
  • Such based on magnetically conductive fluids seals generally have a preferably annular magnet, from which the liquid is attracted due to their magnetically conductive property.
  • the rotating shaft is passed and the magnetically conductive liquid is disposed in the gap between the shaft and the annular magnet and is held in the gap by the magnetic attraction of the magnet.
  • the magnetically conductive liquid seals the gap gas-tight with very good effect.
  • a disadvantage of the use of such based on a magnetically conductive liquid seal is that this is technically complex and expensive.
  • Another disadvantage is that while magnetically conductive metals have good gas barrier properties, on the other hand, they also react chemically with the liquid metal alloy which serves to transfer the electrical current, which in turn is the liquid metal alloy and gasket based on the magnetically conductive liquid makes us unusable.
  • the liquid metal alloy which serves to transfer the electrical current
  • the liquid metal alloy and gasket based on the magnetically conductive liquid makes us unusable.
  • any liquid that does not chemically react with the liquid metal alloy between the on the magnetically conductive Liquid-based seal and the liquid metal alloy to arrange.
  • the teaching is disclosed for the realization of a gas-tight seal to prevent the introduction of gaseous oxygen into the rotary transformer to use a based on a magnetically conductive liquid-based seal.
  • the liquid arranged behind it is in principle arbitrary and merely has to have the chemical property that it does not chemically react with the liquid metal alloy.
  • From the DE 10 2004 027 534 A1 is a wind turbine with a wind power generator having a stator and a rotor and with a current transfer device for temporarily feeding a winding of the rotor, wherein the current of the winding of the rotor is transferred via a liquid metal alloy from a fixed to the rotating part.
  • a rotary transformer wherein the rotary transformer has an electrically conductive first element and an electrically conductive second element, wherein the second element is arranged rotatably relative to the first element, wherein the first and the second element arranged by a gap separated from each other are, being in the Is disposed an electrically conductive liquid metal alloy, which causes an electrically conductive connection between the first and second element, wherein the rotary transformer for preventing contact of the liquid metal alloy with gaseous oxygen has a non-magnetic conductive and gas-impermeable barrier liquid, wherein the barrier liquid between the Liquid metal alloy and a liquid-sealing sealing element in contact with the barrier liquid is arranged.
  • the liquid metal alloy and the barrier liquid are arranged such that they have a contact with each other, wherein as a barrier liquid, a liquid is provided which does not react chemically with the liquid metal alloy and does not mix with the liquid metal alloy. This allows a particularly simple assembly.
  • the sealing element is designed as a sealing ring.
  • a design of the sealing element as a sealing ring, in particular in the form of a simmering, represents a common embodiment of the sealing element.
  • the rotary transformer has a pressure adjustment device for setting a barrier fluid pressure of the barrier fluid.
  • Commercially available liquid-sealing sealing elements can generally not completely prevent leakage of the barrier liquid from the rotary transformer, as often on the sealing element, although distributed only in very small quantities and over a longer period, sealing liquid can escape from the rotary transformer.
  • a pressure adjusting device for setting a barrier fluid pressure of the barrier liquid In order to prevent the occurrence of a vacuum in the rotary transformer due to the presence a pressure adjusting device for setting a barrier fluid pressure of the barrier liquid of advantage.
  • the barrier liquid is not electrically conductive, since then the rotary transformer can be particularly simple.
  • the first and the second element have a coating which repels the barrier liquid. As a result, penetration of the barrier liquid is prevented in the gap and thus prevents contact of the barrier liquid with the liquid metal alloy.
  • the barrier liquid is in the form of an oil.
  • Oils, especially paraffin oils, silicone oils or a mixture of paraffin oil and silicone oil are impermeable to gaseous oxygen as a result of their chemical composition and do not react chemically with the liquid metal alloy. Furthermore, they are neither magnetically conductive nor electrically conductive.
  • FIG. 1 is a rotary transformer 1 according to the invention shown in the form of a schematically illustrated sectional drawing.
  • the rotary transformer 1 is in the context of the embodiment, with the exception of the shaft 8 is substantially mirror-symmetrical constructed with respect to a symmetry line 3.
  • the shaft 8 is substantially mirror-symmetrical constructed with respect to a symmetry line 3.
  • essentially only the elements of the rotary transmitter 1 arranged to the left of the symmetry line 3 are provided with reference numerals.
  • the rotary transformer 1 has an electrically conductive, preferably stationary first element 6. Furthermore, the rotary transformer has a non-electrically conductive shaft 8 rotatably mounted by means of the bearings 12a and 12b. An electrically conductive second element 7 is rotatably connected to the shaft 8, so that the second element 7 rotates with the shaft. The second element 7 is thus arranged rotatably relative to the first element 6, wherein the first and the second element are arranged separated by a gap 9 from each other.
  • FIG. 2 is an in FIG. 1 provided with the reference numeral 19 area enlarged in detail.
  • the rotary transformer 1 has a gap 9 between the first element 6 and the second element 7.
  • an electrically conductive liquid metal alloy 21 is arranged, which produces an electrically conductive connection between the first element 6 and the rotatably arranged second element 7. If, then, a voltage U 1 generated by a voltage source 25 is applied via a resistor 27 between the first element 6 and the second element 7, which is shown in FIG FIG. 1 is shown schematically, so a current I 1 is transmitted from the stationary first element 6 via the liquid metal alloy 21 to the second element 7.
  • the rotary transformer thus serves to transmit an electrical current I 1 between the first element and the second element rotatably arranged with respect to the first element.
  • an electrical line 31 which is electrically conductively connected to the second element 7 and by the non-electrically conductive shaft 8 (shaft may consist of plastic) is guided, the current I 1 from the second element 7 to the outside.
  • the first element 6 and second element 7 each have a surface coating 22 which ensures good wetting of the first element 6 and the second element 7 with the liquid metal alloy 21, and respectively a further surface coating 23, which ensures poor wetting of the first element 6 and the second element 7 with the liquid metal alloy 21 in the region of the further surface coating 23.
  • the two surface coatings ensure that the liquid metal alloy 21 does not escape from the gap 9.
  • the rotary transformer 1 To prevent contact of the liquid metal alloy 21 with gaseous oxygen from the ambient air of the rotary transformer, the rotary transformer 1 according to the invention a non-magnetically conductive and impermeable to gaseous oxygen barrier liquid 10, wherein the barrier liquid 10 between the liquid metal alloy 21 and one with the barrier liquid 10 in contact liquid-tight sealing element 13 is arranged.
  • the liquid-tight sealing element 13 (see FIG. 1 ) is within the scope of the embodiment in the form of a sealing ring, such as a Simmerring and prevents leakage of the barrier liquid 10 from the rotary transformer 1.
  • the sealing element 13 has a sealing lip 29, due to the curved shape of the sealing element 13 against the rotatably mounted Shaft 8 is pressed and thus leakage of the barrier liquid 10 to the bearing 12 a back and out of the rotary transformer 1 also prevented. It is important that by means of the sealing element 13 according to the invention only a seal against a liquid, but not more than in the prior art, a very good seal against gaseous oxygen must be realized.
  • Liquid-sealing sealing elements, such as sealing rings are mass-produced and therefore correspondingly very favorable in contrast to the so-called ferrofluid seals based on magnetically conductive liquids which are used in the prior art.
  • the sealing of the rotary transformer 1 to gaseous oxygen from ambient air is thus achieved in two stages according to the invention.
  • a gas-tight barrier of the liquid metal alloy to gaseous oxygen is realized and in a further stage, the flow of the barrier liquid 10 is prevented by a fattykeitsabêtnde seal.
  • the barrier liquid 10 ensures a gas-tight seal of the gap 9.
  • the sealing element 13 is indeed liquid-sealing, but not gas-tight.
  • the barrier liquid 10 is impermeable to gaseous oxygen, i. the barrier liquid 10 must have the property that no gaseous oxygen can diffuse through it. Distilled water as the barrier liquid 10 would be e.g. completely unsuitable, since this is permeable to gaseous oxygen, since gaseous oxygen can diffuse through the water and thus could come into contact with the liquid metal alloy 21. Thus, it is only very specific liquids which are impermeable to gaseous oxygen because of their molecular and / or atomic binding properties as barrier liquid.
  • Particularly suitable as a barrier liquid are oils.
  • the oil may e.g. in the form of paraffin oil or silicone oil or a mixture of paraffin oil and silicone oil.
  • the liquid metal alloy 21 and the barrier liquid 10 are arranged so as to be in contact with each other, providing a barrier liquid of a liquid in addition to the above-mentioned characteristics does not chemically react with the liquid metal alloy and does not mix with the liquid metal alloy.
  • the barrier liquid may have a different density to prevent mixing with the liquid metal alloy or having a different from the liquid metal alloy substance pairing (polar or non-polar).
  • Suitable barrier fluids are, as stated above, oils such as paraffin oils, silicone oils or a mixture of both oils.
  • the first and the second element may have a coating which repels the barrier liquid.
  • the further coating 23 can thus be designed, for example, such that it also simultaneously repels the barrier liquid 10 in addition to the liquid metal alloy 21.
  • the coating for repelling the barrier liquid may also be present in addition to the coating 22 and the further coating 23. In this way, penetration of the barrier liquid 10 into the gap 9 is prevented, thus preventing contact of the barrier liquid 10 with the liquid metal alloy 21.
  • the barrier fluid is not electrically conductive, which is given when using an oil as a barrier fluid, since then the structure of the rotary transformer can be made particularly simple.
  • the rotary transformer has a pressure adjusting device 15, which consists of an adjusting screw 16, a spring element 17 and a plunger 18. By turning the screw 16, the force can be adjusted, the spring 17 on the plunger 18 and thus exerts on the barrier liquid 10.
  • the barrier liquid pressure of the barrier liquid can be adjusted so that it remains constant in the event of leakage of small amounts of the sealing liquid on the sealing element 13. If the screw 16 is completely unscrewed and the spring 17 and the plunger 18 are removed, the barrier liquid 10 can be refilled via the then resulting channel in a simple manner.
  • the rotary transformer still has some stationary housing parts 30.
  • the rotary transformer In the context of the embodiment of the rotary transformer is formed two channels, ie it can also transmit a further current I 2 , which in relation to the line of symmetry 3 in FIG. 1 is shown on the right side.
  • the two channels are galvanically separated from each other by the barrier liquid 11, which is identical to the barrier liquid 10.
  • a magnetically conductive substance is understood to be a ferromagnetic or ferrimagnetic material. Accordingly, for the purposes of the invention, a diamagnetic substance or a paramagnetic substance is regarded as a non-magnetically conductive substance, wherein in particular a substance which has a relative permeability of 1 or less than 1, in the sense of the invention, is regarded as a non-magnetically conductive substance.

Landscapes

  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
EP08012676A 2008-07-14 2008-07-14 Transmetteur Expired - Fee Related EP2146403B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08012676A EP2146403B1 (fr) 2008-07-14 2008-07-14 Transmetteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08012676A EP2146403B1 (fr) 2008-07-14 2008-07-14 Transmetteur

Publications (2)

Publication Number Publication Date
EP2146403A1 true EP2146403A1 (fr) 2010-01-20
EP2146403B1 EP2146403B1 (fr) 2012-04-25

Family

ID=39769454

Family Applications (1)

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EP08012676A Expired - Fee Related EP2146403B1 (fr) 2008-07-14 2008-07-14 Transmetteur

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EP (1) EP2146403B1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010024431A1 (de) * 2010-06-21 2011-08-18 Siemens Aktiengesellschaft, 80333 Kabellose elektrische Verbindung
DE202010012270U1 (de) 2010-09-07 2011-12-22 rc-direct Unternehmergesellschaft (haftungsbeschränkt) Übertrager
DE102010040366A1 (de) 2010-09-07 2012-03-08 rc-direct Unternehmergesellschaft (haftungsbeschränkt) Leistungsübertrager für ein Windrad
EP2498347A1 (fr) 2011-03-08 2012-09-12 Siemens Aktiengesellschaft Transmetteur
CN106099595A (zh) * 2016-05-26 2016-11-09 无锡太湖学院 一种具有石墨烯碳刷结构的集电装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1219569A (fr) * 1958-03-31 1960-05-18 Vickers Electrical Co Ltd Perfectionnements apportés aux connexions électriques de conducteurs en mouvement de rotation
US3972577A (en) * 1974-09-23 1976-08-03 Etat Francais Represented By Delegation Ministerielle Pour L'armement Isobaric device with rotating electrical contacts
EP0716013A1 (fr) * 1994-12-09 1996-06-12 Aquamaster-Rauma Ltd. Dispositif pour le transfert de courant électrique à un dispositif de propulsion équipé d'un moteur électrique dans un bateau ou similaire
WO2005062432A1 (fr) 2003-12-22 2005-07-07 Siemens Aktiengesellschaft Ensemble bague collectrice
DE102004027534A1 (de) 2004-06-04 2005-12-29 Siemens Ag Windkraftanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1219569A (fr) * 1958-03-31 1960-05-18 Vickers Electrical Co Ltd Perfectionnements apportés aux connexions électriques de conducteurs en mouvement de rotation
US3972577A (en) * 1974-09-23 1976-08-03 Etat Francais Represented By Delegation Ministerielle Pour L'armement Isobaric device with rotating electrical contacts
EP0716013A1 (fr) * 1994-12-09 1996-06-12 Aquamaster-Rauma Ltd. Dispositif pour le transfert de courant électrique à un dispositif de propulsion équipé d'un moteur électrique dans un bateau ou similaire
WO2005062432A1 (fr) 2003-12-22 2005-07-07 Siemens Aktiengesellschaft Ensemble bague collectrice
DE102004027534A1 (de) 2004-06-04 2005-12-29 Siemens Ag Windkraftanlage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010024431A1 (de) * 2010-06-21 2011-08-18 Siemens Aktiengesellschaft, 80333 Kabellose elektrische Verbindung
DE202010012270U1 (de) 2010-09-07 2011-12-22 rc-direct Unternehmergesellschaft (haftungsbeschränkt) Übertrager
DE102010040366A1 (de) 2010-09-07 2012-03-08 rc-direct Unternehmergesellschaft (haftungsbeschränkt) Leistungsübertrager für ein Windrad
WO2012032483A2 (fr) 2010-09-07 2012-03-15 Rc-Direct Ug Coupleur électromécanique pour une éolienne
EP2498347A1 (fr) 2011-03-08 2012-09-12 Siemens Aktiengesellschaft Transmetteur
CN106099595A (zh) * 2016-05-26 2016-11-09 无锡太湖学院 一种具有石墨烯碳刷结构的集电装置
CN106099595B (zh) * 2016-05-26 2018-07-03 无锡太湖学院 一种具有石墨烯碳刷结构的集电装置

Also Published As

Publication number Publication date
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