EP2498347A1 - Transmetteur - Google Patents

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Publication number
EP2498347A1
EP2498347A1 EP11157265A EP11157265A EP2498347A1 EP 2498347 A1 EP2498347 A1 EP 2498347A1 EP 11157265 A EP11157265 A EP 11157265A EP 11157265 A EP11157265 A EP 11157265A EP 2498347 A1 EP2498347 A1 EP 2498347A1
Authority
EP
European Patent Office
Prior art keywords
porous material
electrically conductive
liquid metal
recess
metal alloy
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
EP11157265A
Other languages
German (de)
English (en)
Other versions
EP2498347B1 (fr
Inventor
Joachim Denk
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 EP20110157265 priority Critical patent/EP2498347B1/fr
Publication of EP2498347A1 publication Critical patent/EP2498347A1/fr
Application granted granted Critical
Publication of EP2498347B1 publication Critical patent/EP2498347B1/fr
Not-in-force 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 first and the second element are arranged rotatably to each other, wherein the first and the second element are arranged separated by a gap from each other, wherein in the gap an electrically conductive liquid metal alloy is arranged.
  • an electric current often has to be transmitted from a stationary to a rotating system or vice versa.
  • rotary joints which usually transmit electric current based on slip rings.
  • slip rings sliding contacts are subject to a temporally progressive mechanical abrasion. Consequently, an uninterrupted transmission of electric current over a long period of time, especially with a large mechanical load of the rotary transformer (for example, at high speeds or high currents) can be ensured only with great effort.
  • Rotary transformers which use liquid metal alloys instead of the conventional slip rings.
  • a current transmission surface is provided in each case on a stationary part and on a part of the rotary transformer rotating relative thereto, wherein a gap is arranged between the two current transmission surfaces in which the liquid metal alloy is introduced.
  • the liquid metal alloy By the liquid metal alloy, an electrically conductive connection is created between the two parts, which does not affect the rotation of the rotating part relative to the stationary part.
  • a rotary transformer wherein the rotary transformer has an electrically conductive first element and an electrically conductive second element, wherein the first and the second element are arranged rotatably to each other, wherein the first and the second element arranged separated by a gap from each other are, wherein in the gap an electrically conductive liquid metal alloy is arranged, wherein the first element on its side facing the second element has a first recess and the second element on its side facing the first element has a second recess, wherein in the first and second recesses an electrically conductive first porous material is arranged, wherein the liquid metal alloy has an electrically conductive connection between the electrically conductive first porous material arranged in the first recess and the electrically conductive first porous material arranged in the second recess al produces.
  • a second porous material is arranged between the first porous material arranged in the first recess and the first element, and between the first porous material arranged in the second recess and the second element.
  • the first element has on its side facing the second element a plurality of mutually separate first recesses and the second element has on its side facing the first element a plurality of mutually separate second recesses, wherein in the first and second Recesses an electrically conductive porous material is arranged, wherein the liquid metal alloy produces an electrically conductive connection between the arranged in the first recesses electrically conductive first porous material and the arranged in the second recesses electrically conductive first porous material.
  • the second porous material has ceramic particles and metal particles. This ensures a particularly reliable retention of the liquid metal alloy in the gap.
  • the ceramic particles are made of aluminum oxide, since ceramic particles can be produced in a particularly simple manner from aluminum oxide.
  • the second porous material has metal particles, wherein a part of the metal particles has a non-stick coating. As a result, a particularly secure retention of the liquid metal alloy is ensured in the gap.
  • the non-stick coating is in the form of a ceramic coating, since a ceramic coating has a particularly good anti-adhesive effect against the liquid metal.
  • the ceramic coating consists of aluminum oxide, since the ceramic coating can be made in a particularly simple manner of aluminum oxide.
  • the first porous material has metal particles, since then the first porous material has a particularly good adhesion to the liquid metal.
  • the metal particles have molybdenum, titanium or iron.
  • the metals molybdenum, titanium or iron are particularly suitable for the production of metal particles.
  • FIG. 1 Shown in the form of a schematic representation of an inventive rotary transformer 1, wherein for the sake of clarity, only the essential elements of the understanding of the invention elements of the rotary transformer are shown.
  • FIG. 2 is shown in the form of a schematic representation of a sectional view of the rotary transformer according to the invention and in FIG. 3 is a detail view of FIG. 2 shown.
  • the rotary transformer 1 has an electrically conductive, preferably annularly designed first element 2 and an electrically conductive, preferably annular, second element 3.
  • the first and the second element are arranged rotatably relative to one another.
  • the second element 3 is rotatably arranged and the first element 2 is arranged stationary.
  • the second element 3 for example with a rotatably mounted motor shaft or generator shaft, be rotatably connected so that it rotates with the motor or generator shaft and the first element 2 is arranged at rest.
  • the second element 3 rotates during operation of the rotary transformer in the direction of rotation R.
  • the first element 2 is arranged circumferentially around the second element 3.
  • a gap 4 is arranged, the width of the sake of clarity in FIG. 1 wider than shown in reality.
  • the second element 3 rotates during operation of the rotary transformer 1 about the axis of rotation Z of the rotary transformer in the direction of rotation R.
  • an electrical connection element 5a is attached to connect an electrical line 6a.
  • an electrical connection element 5b is attached to the second element 3 for connection of an electrical line 6b.
  • gap 4 is an electrically conductive liquid metal alloy 8, which causes an electrically conductive connection between the first and second elements 2 and 3.
  • the first element 2 and the second element 3 are preferably in the form of metal rings, which may consist of steel, for example.
  • the first element 2 has a first recess 15a on its side 9a facing the second element 3, and the second element 3 has a second recess 15b on its side 9b facing the first element 2.
  • the first and the second recess preferably have a rectangular cross section and are preferably in the form of a groove which is introduced into the respective element.
  • an electrically conductive first porous material is arranged in the first and the second recess 15a and 15b, wherein the liquid metal alloy forms an electrically conductive connection between the electrically conductive first porous material 7 arranged in the first recess 15a and the electrically conductive one arranged in the second recess first porous material 7 produces.
  • FIG. 4 is that in FIG. 3 shown on the left side shown first porous material 7, wherein in FIG. 4 the same elements are provided with the same reference numerals as in 1 to FIG. 3 ,
  • the first porous material due to its porosity and its associated high surface area, strongly attracts the liquid metal alloy and thereby holds the liquid metal alloy in the gap between the first and second elements 2 and 3.
  • the first porous material 7 is preferably made of metal particles, for the sake of clarity in FIG. 4 only a metal particle 11 is provided with a reference numeral. A part of the liquid metal alloy 8 is thus sucked into the cavities arranged between the metal particles, whereby the liquid metal alloy 8 adheres very well to the first porous material 7.
  • the first porous material 7 has a high adhesion effect.
  • the metal particles are preferably molybdenum, titanium or iron and are preferably predominantly or wholly molybdenum, titanium or iron.
  • FIG. 10 is a detail view on the arranged in the first recess 15 a, in FIG. 3 shown on the right side shown first porous material, wherein in FIG. 10 the same elements are provided with the same reference numerals as in FIG. 4 ,
  • a preferably electrically conductive second porous material 10 may be arranged between the first porous material 7 arranged in the first recess 15a and the first element 2, and between the first porous material 7 arranged in the second recess 15b and the second element 3, a preferably electrically conductive second porous material 10 may be arranged.
  • FIG. 5 the second porous material 10 arranged between the second element 3 and the first porous material 7 is shown.
  • FIG. 9 is that too FIG. 5 corresponding representation with respect to the arranged between the first element 2 and the first porous material 7 second porous material 10 is shown.
  • the second porous material 10 has ceramic and metal particles, with only one metal particle 11 'and one ceramic particle 12 being provided with a reference symbol for the sake of clarity.
  • the second porous material 10 consists of a mixture of ceramic and metal particles.
  • the ceramic particles are preferably made of aluminum oxide.
  • the metal particles of the second porous material 10 are preferably made of the same material as the first porous material 7.
  • the ceramic particles have a repellent effect on the liquid metal alloy. This ensures that the layer consisting of the second porous material is not completely soaked with the liquid metal alloy, but still remain between the individual particles of the second porous material cavities that remain empty during normal operation of the rotary transformer, ie in the no liquid metal alloy is involved.
  • the non-stick effect of the ceramic particles on the liquid metal alloy prevents the second porous material from becoming completely saturated with the liquid metal alloy. Under extreme conditions, if eg due to High centrifugal forces caused by high rotational speeds or vibration coupling by external sources and acting on the liquid metal alloy, thus leaving a reservoir into which the liquid metal alloy can still penetrate in these extreme cases, so that no liquid metal alloy emerges from the gap.
  • a type of sponge is created, which does not fully soak in normal operation of the rotary transformer with the liquid metal alloy, so that even under extreme conditions ensures that a residual suction on the liquid metal alloy is maintained and thus this remains in the gap 4.
  • the second porous material a kind of pumping action is generated, which ensures that even under extreme conditions in which high forces act on the liquid metal, this is securely held in the gap.
  • the second porous material 10 may also have metal particles 11 'coated with a non-stick coating 13.
  • the second porous material thus comprises metal particles, with a portion of the metal particles having a non-stick coating.
  • the metal particles of the second porous material 10 preferably consist of the same material as the metal particles of the first porous material.
  • the non-stick coating 13 may e.g. in the form of a ceramic coating, which preferably consists of aluminum oxide.
  • the operating principle is otherwise the same as in the embodiment in which the second porous material consists of a mixture of metal particles and ceramic particles.
  • the liquid metal is strongly attracted by the first and if present by the second porous material, it is securely held in the gap 4, which has a favorable effect on the manufacturing cost of the rotary transformer 1, since the gap 4 can be increased and thus the dimensions of the first and second elements of the rotary transformer can have greater tolerances and still a very reliable holding of the liquid metal alloy is ensured in the gap.
  • FIG. 8 a further embodiment of the rotary transformer 1 according to the invention is shown, wherein in 7 and FIG. 8 the same elements are provided with the same reference numerals as in 1 to FIG. 3 ,
  • the first element 2 on its second element 3 facing side 9a a plurality of mutually separate first recesses 15a 'and the second element 3 on its the first element 2 side facing 9b a plurality of separate second recesses 15b 'up.
  • the recesses are separated by partitions, with the sake of clarity in FIG. 7 only the partitions 14a and 14b are provided with reference numerals.
  • the first and the second recesses 15a 'and 15b' are arranged one behind the other in the direction of rotation R and in the context of the exemplary embodiment consist of grooves which have been introduced into the first and second elements 2 and 3, for example by milling.
  • FIG. 7 For the sake of clarity, the electrical connection elements and the electrical lines to the connection elements are not shown, and the first element 2 and the second element 3 are shown offset in the direction of the rotation axis Z.
  • FIG. 8 is a sectional view of the embodiment according to FIG. 7 represented, wherein like elements are provided with the same reference numerals as in FIG. 7 , Otherwise, the arrangement as well as the mode of action of the first and preferably present second porous material arranged in the first and second recesses corresponds exactly to that described in the first embodiment of the invention.
  • the only difference of the embodiment according to 7 and FIG. 8 Compared to the first embodiment is that the first and second recesses described therein in the second Embodiment are performed segmented.
  • the influence of the weight and the resulting uneven mass distribution of the liquid metal alloy in the gap can be greatly reduced because, when the rotation axis Z extends in the horizontal direction, and the rotary transformer is thus upright, the liquid metal can not collect more in the lower region of the gap 4, while the upper portion of the gap 4 is not or only insufficiently electrically bridged by the liquid metal.
  • the first and the porous material may e.g. in the form of powder metallurgically produced solids, in particular in the form of powder metallurgically produced solid state rings.
  • the first element can at the same time, in many cases, take over the function of the mechanical support of the second element 3 arranged rotatably in the exemplary embodiment, similar to a plain bearing bush saturated with lubricant.
  • the mechanical structure of the rotary transformer can be considerably simplified.
EP20110157265 2011-03-08 2011-03-08 Transmetteur rotatif Not-in-force EP2498347B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20110157265 EP2498347B1 (fr) 2011-03-08 2011-03-08 Transmetteur rotatif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110157265 EP2498347B1 (fr) 2011-03-08 2011-03-08 Transmetteur rotatif

Publications (2)

Publication Number Publication Date
EP2498347A1 true EP2498347A1 (fr) 2012-09-12
EP2498347B1 EP2498347B1 (fr) 2015-04-29

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ID=44209730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110157265 Not-in-force EP2498347B1 (fr) 2011-03-08 2011-03-08 Transmetteur rotatif

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EP (1) EP2498347B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244052A (zh) * 2020-09-09 2022-03-25 西门子医疗有限公司 直流马达、检查床以及用于运行直流马达的方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890304A (en) * 1957-03-06 1959-06-09 Jr Howard W Cole Mercury slip ring for electrical apparatus
US3622944A (en) * 1969-08-05 1971-11-23 Tokai Denki Kk Electrical connector
SU1092631A1 (ru) * 1982-11-24 1984-05-15 Ордена Трудового Красного Знамени Институт Химических Наук Ан Казсср Ртутный токосъемник
WO2005062432A1 (fr) 2003-12-22 2005-07-07 Siemens Aktiengesellschaft Ensemble bague collectrice
WO2007147657A1 (fr) 2006-06-22 2007-12-27 Siemens Aktiengesellschaft Machine-outil ou machine de production ou robot
EP2146403A1 (fr) 2008-07-14 2010-01-20 Siemens Aktiengesellschaft Transmetteur
DE102009018655A1 (de) * 2009-04-23 2010-10-28 Siemens Aktiengesellschaft Flüssigmetall-Dreh-Übertrager

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2890304A (en) * 1957-03-06 1959-06-09 Jr Howard W Cole Mercury slip ring for electrical apparatus
US3622944A (en) * 1969-08-05 1971-11-23 Tokai Denki Kk Electrical connector
SU1092631A1 (ru) * 1982-11-24 1984-05-15 Ордена Трудового Красного Знамени Институт Химических Наук Ан Казсср Ртутный токосъемник
WO2005062432A1 (fr) 2003-12-22 2005-07-07 Siemens Aktiengesellschaft Ensemble bague collectrice
WO2007147657A1 (fr) 2006-06-22 2007-12-27 Siemens Aktiengesellschaft Machine-outil ou machine de production ou robot
EP2146403A1 (fr) 2008-07-14 2010-01-20 Siemens Aktiengesellschaft Transmetteur
DE102009018655A1 (de) * 2009-04-23 2010-10-28 Siemens Aktiengesellschaft Flüssigmetall-Dreh-Übertrager

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114244052A (zh) * 2020-09-09 2022-03-25 西门子医疗有限公司 直流马达、检查床以及用于运行直流马达的方法

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