EP2338211A1 - Ensemble bague collectrice - Google Patents

Ensemble bague collectrice

Info

Publication number
EP2338211A1
EP2338211A1 EP09778446A EP09778446A EP2338211A1 EP 2338211 A1 EP2338211 A1 EP 2338211A1 EP 09778446 A EP09778446 A EP 09778446A EP 09778446 A EP09778446 A EP 09778446A EP 2338211 A1 EP2338211 A1 EP 2338211A1
Authority
EP
European Patent Office
Prior art keywords
slip ring
cable
ring unit
brush element
unit according
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
EP09778446A
Other languages
German (de)
English (en)
Other versions
EP2338211B1 (fr
Inventor
Ludwig Angerpointner
Norbert Friese
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.)
LTN Servotechnik GmbH
MD Elektronik GmbH
Original Assignee
LTN Servotechnik GmbH
MD Elektronik 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=41259840&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2338211(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by LTN Servotechnik GmbH, MD Elektronik GmbH filed Critical LTN Servotechnik GmbH
Publication of EP2338211A1 publication Critical patent/EP2338211A1/fr
Application granted granted Critical
Publication of EP2338211B1 publication Critical patent/EP2338211B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01R39/64—Devices for uninterrupted current collection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables

Definitions

  • the invention relates to a slip ring unit for the electrical connection of two relatively rotatable components, according to claim 1.
  • slip ring units consist of a slip ring brush and grinding wheels, in particular slip rings, whereby the slip ring brush has sliding contact with rotating slip rings during operation.
  • slip ring units are used in many technical fields to electrical voltages, in particular signals or electrical power z. B. to transfer from a stationary to a rotating electrical unit. It is important that there is a good and lasting contact between the slip ring brush and the slip rings, for example through springy brush elements.
  • the patent EP 1808941 shows a slip ring unit in which bent brush wires transmit electrical voltages or currents or signals to rotatable slip rings.
  • bent brush wires transmit electrical voltages or currents or signals to rotatable slip rings.
  • such arrangements are not suitable for transmitting high-frequency digital signals, which are usually transmitted in shielded lines, in addition to the analog currents from the brush wires to a relatively rotating slip ring.
  • the invention has for its object to provide a compact slip ring unit for reliable and secure transmission of electrical voltages, in particular of analog currents and digital signals, which can be produced with little effort. This object is achieved by the features of claim 1.
  • the slip ring unit is configured so that it is suitable for the electrical connection of two relatively rotatable components.
  • One of the components is configured as a first cable having a core and a screen.
  • the slip ring assembly includes a first brush member which is in electrical contact with a first abrasive member.
  • the slip ring unit comprises a second brush element, which is in electrical contact with a second abrasive body, for transmitting a voltage applied to the core.
  • the slip ring unit comprises a third brush element, which is in electrical contact with a third abrasive body for transmitting a voltage applied to the screen or an applied electrical potential.
  • the first abrasive body has an axially continuous recess through which the first cable is guided for transmitting the voltage applied to the core.
  • the second brush element is arranged with radial offset to the third brush element.
  • a contact pressure force can be generated by the relevant brush element on the respective grinding body on the brush elements, which has a radial direction component.
  • the second brush element can also be arranged in the axial direction to overlap with the third brush element. That is, both the second brush member and the third brush member are arranged in one (one and the same) cross section of the slip ring unit.
  • the cross section of the slip ring unit is a section through the slip ring unit, which is aligned orthogonal to the axis of rotation.
  • a transmission of electrical voltages is in principle also accompanied by a transmission of electrical currents, unless there is an infinitely high electrical resistance.
  • a transfer of voltage generally also means a transfer of current.
  • electrical signals are physi- Also on electrical voltages, so that the transmission of voltages can also mean a transmission of signals. Since electrical voltages are often also referred to as electrical potentials, shielding potentials can also be transmitted by the slip ring unit.
  • the first brush element which is in electrical contact with a first grinding body, may be designed, for example, to transmit analog currents for supplying power to an electrical device.
  • the second brush element which is in electrical contact with the second abrasive body, can be used to transmit a signal applied to the soul, in particular a digital high-frequency signal.
  • the slip ring unit comprises a plurality of first brush elements and a plurality of first grinding bodies for transmitting electrical voltages, in particular analog currents, wherein the first brush elements and the first grinding bodies are each arranged with axial offset from one another.
  • the first abrasive body has an axially continuous central bore for receiving the first cable.
  • the abrasive body can be designed annular and thus be referred to as a slip ring.
  • the second brush element can be arranged axially offset from the first brush element.
  • the first cable is rotatably arranged relative to the first brush element. Accordingly, then the first cable can be arranged non-rotatably relative to the first grinding body in the slip ring unit. For example, during operation of the slip ring unit, the first cable may rotate with the first abrasive wheel.
  • electrical voltages are transferable from the first cable to a second cable by the slip ring unit, wherein the second cable has a core and a screen, wherein the screen of the second cable is electrically connected to a sleeve and the screen of the first Cable is electrically connected to the third abrasive body, and the sleeve and the third abrasive body in the axial and in particular also in the radial direction are arranged overlapping.
  • the first cable and the second cable may be configured as coaxial cables.
  • the voltages to be transmitted in particular digital signals, have a comparatively high frequency, not infrequently greater than 250 MHz, or greater than 1 GHz. It is therefore important that the slip ring unit does not radiate any electromagnetic interference pulses with regard to the transmission of the digital signals, but that it is also particularly protected against the effects of external electromagnetic fields. In particular, a high level of safety in this regard is required in medical technology applications.
  • the slip ring unit electrical voltages, in particular analog currents, transferable from a third cable to a fourth cable, wherein the third cable can be guided by the axially continuous recess of the first grinding body.
  • the slip ring unit is configured so that electrical voltages, in particular analog currents, from a third cable to a fourth cable can be transmitted by the slip ring unit and electrical voltages, in particular digital signals, from the first cable to a second cable are transferable, wherein the fourth cable is guided within a housing of the slip ring unit offset radially outward of the second cable.
  • either the second brush element or the third brush element or both brush elements are designed as a hollow body.
  • one of the brush elements or both brush elements can be configured such that the relevant brush element or the brush elements have radially resilient properties.
  • the second brush element or the third brush element or both can have radially resilient tongues.
  • the second brush element or the third brush element or both brush elements can also be designed as flat spiral springs with cycloid-like geometry, to allow a comparatively soft sliding contact.
  • the core of the first cable is electrically connected to the electrically conductive second abrasive body and a potting compound is provided which surrounds the second abrasive body and the core for receiving at least a portion of the torque required for the operation of the slip ring assembly.
  • the slip ring unit for receiving at least a portion of the torque required for the operation of the slip ring unit can be designed such that electrical voltages, in particular digital signals, can be transmitted from the first cable to a second cable and the second cable has a core and a screen, wherein the core of the second cable is electrically connected to an electrically conductive element.
  • a potting compound is provided, which surrounds the element and the soul.
  • the element can serve as a holder for the second brush element, so that during operation of the slip ring unit, a torque resulting from tangential frictional forces is introduced via the element into the slip ring unit. Potting compound, for example, an initially flowable and then curable material, including an adhesive understood.
  • the potting compound is surrounded by a sleeve.
  • an improvement of the torque transmission can be achieved if a) the grinding body or b) the said element has at least one recess for non-positive connection of the casting compound with the grinding body or the element.
  • FIG. 1 shows a sectional view of a slip ring unit
  • FIG. 22 shows a detail of the sectional view of the slip ring unit, in particular the area for transmitting digital signals
  • FIG. 3 shows a detail of the sectional representation of the slip ring unit, in particular the area for the transmission of analogous currents,
  • FIG. 4 a shows a side view of a brush element for transmitting digital signals
  • FIG. 4b shows a top view of the brush element for transmitting digital signals
  • Figure 5a is a side view of another brush element for transmitting the electrical potential of a screen
  • Fig. 55bb is a plan view of the further brush element for transmitting the electrical potential of the screen.
  • the slip ring unit presented in the exemplary embodiment serves for the transmission of electrical voltages, here in particular of analog currents and digital signals, so that, for example, a rotatable electronic
  • the camera can be connected to a stationary unit.
  • analog currents come about currents to move servomotors, z. B. a zoom drive, into consideration and streams for the operation of the camera electronics.
  • the camera delivers high-frequency digital signals for image transmission, which can also be transmitted without interference by the slip ring unit.
  • the slip ring unit comprises a stator 1 and a rotor 2.
  • the rotor 2 is arranged to be rotatable relative to the stator 1 by means of bearings 3.
  • a first cable 21 Concentric with the axis of rotation, among other things, a first cable 21, which is designed as a so-called coaxial cable, guided in the rotor 2 (see also Figure 3).
  • the first cable 21 serves to transmit the digital signals having a frequency in the GHz range. It has a central electrically conductive core 21.1, which is surrounded by a dielectric layer 21.2.
  • the dielectric layer 21.2 is in turn surrounded by a screen 21.3, the screen 21.3 comprises in the presented embodiment, a metal mesh.
  • the first cable 21 has an outer insulation 21.4.
  • the screen 21.3 of the first cable 21 is shown in FIG 1 with a sleeve 2.3, which serves as (third) abrasive body, electrically connected, for. B. by a crimp connection. Furthermore, the core 21.1 of the first cable 21, here with a solder connection, electrically contacted with a pin 2.2 and mechanically fixed against rotation.
  • the pin 2.2 has a central axial blind hole, in which the soul 21.1 is introduced. As will be explained below, pin 2.2 in the slip ring assembly acts as a (second) abrasive article.
  • a radially oriented bore 2.31 is incorporated into the sleeve 2.3 so that accessibility to the intended solder joint is ensured.
  • a potting compound is introduced through the bore 2.31 after soldering, which helps to accommodate the resulting during operation of the slip ring unit torque.
  • a radial recess is additionally provided at pin 2.2. hen, which is not shown in the figures, but in principle as the groove 1.41 described below is configured.
  • the potting compound 2.6 is surrounded by the sleeve 2.3, so that the radial distance between the sleeve 2.3 and the pin 2.2, or between the sleeve 2.3 and the soul 21.1 is filled in an axial section with potting compound 2.6.
  • the sleeve 2.3 is surrounded by a component 2.5 of the rotor 2, which is supported on one of the bearings 3.
  • the first cable 21 is surrounded radially by a third cable 22, which consists of several isolated individual strands.
  • the individual strands of the third cable 22 are each guided radially outwardly through a slot in an electrically insulating support sleeve 2.4 of the rotor 2 to a respective first abrasive body, here in each case a slip ring 2.1.
  • the individual strands of the third cable 22 are each contacted.
  • the slip rings 2.1 are axially aligned with the axial offset Y on the insulating support sleeve 2.4, wherein optionally between adjacent slip rings 2.1 an electrically non-conductive insulating ring is arranged.
  • all the grinding rings 2.1 are arranged coaxially.
  • Each slip ring 2.1 has a circumferential groove, which has a V-shaped geometry (see also Figure 3).
  • a second cable 1 1 is arranged, in addition to the substantially parallel axis, a fourth cable 12 extends.
  • the second cable 11 is used to transmit the digital signals and is also designed as a coaxial cable, so in principle as the first cable 21 constructed so that it has a soul 11.1, a dielectric 1.2, a screen 11.3 and an insulating outer layer 11.4.
  • the screen 1 1.3 is electrically connected for example by a crimp connection with a hollow body 2.7.
  • On the hollow body 2.7 is in axial extension a attached further sleeve, which is referred to below as a holder sleeve 1.7.
  • the core 11.1 of the second cable 11 is electrically and mechanically non-rotatably connected to a sleeve-shaped element 1.4 by a soldered connection 1.8.
  • the sleeve-shaped element 1.4 has a recess in the form of a groove 1.41. Alternatively, a plurality of recesses can be incorporated into the element 1.4.
  • the soldering is done by a radial bore 1.71 in the holder sleeve 1.7. After the soldering process potting compound 1.6 is pressed through the bore 1.71 in the cavity between the holder sleeve 1.7 and the element 1.4 or between the holder sleeve 1.7 and the soul 1 1.1.
  • the potting 1.6 then hardens and serves to accommodate at least a portion of the torque required for the operation of the Schieifringarii.
  • the load capacity of this connection is enhanced by the recess 1.41, through which a non-positive connection of the potting compound 1.6 is made with the sleeve-shaped element 1.4.
  • a frictional connection of the potting compound 1.6 is achieved with the holder sleeve 1.7. Because the volume of the potting compound 1.6 is distributed so that casting compound 1.6 also remains in the bore 1.71, so that there goes radially beyond the inner diameter of the holder sleeve 1.7 out and so there is also a positive connection is generated.
  • the rotor-side connection between the potting compound 2.6 and the sleeve 2.3 is formed analogously to the described connection with the stator-side potting compound 1.6.
  • the fourth cable 12 serves to transmit the analog currents and also has several individual strands.
  • the individual strands are brought into contact with first brush elements 1.1.
  • the first brush elements 1.1 are fastened to a holder which is designed as a printed circuit board and, incidentally, is not shown in the figures.
  • the first brush elements 1.1 are also shown here as fe running end wire bracket, which are arranged with axial offset Y to each other.
  • FIGS. 4a and 4b show the second brush element 1.2.
  • the second brush element 1.2 is made of a thin (0.1 mm) sheet metal strip, which is bent into an open ring and are incorporated into the recesses or openings by an etching process, so that tongues 1.21 arise. These tongues 1.21 are bent radially inwards to achieve the spring action. Each tongue 1.21 also includes a radially inwardly directed protrusion, produced by a bending process, which serves to produce a sliding contact on the surface of the pin 2.2.
  • the second brush element 1 .2 can be inserted axially into the element 1.4, wherein an axial securing of the second brush element 1.2 relative to the sleeve-shaped element 1.4 is produced by a return in the element 1.4.
  • the third brush element 1.3 is constructed, which likewise comprises resilient tongues 1.31.
  • the third brush element 1.3 is fixed in the holder sleeve 1.7 according to the same principle as the second brush element 1.2 in the sleeve-shaped element 1.4.
  • FIG. 5b omits the representation of the contours visible through the slits in the brush element 1.3.
  • the pin 2.2 and the sleeve 2.3 can be inserted into the brush elements 1.2 and 1.3 respectively. Thereafter, the stator-side holder sleeve 1.7 and the rotor-side sleeve 2.3 are arranged overlapping in the axial direction, which is particularly important for the shielding of electromagnetic radiation, since the holder sleeve 1.7 and the sleeve 2.3 with the umbrellas 1 1.3, 21.3 are electrically contacted.
  • the axis of rotation of the rotor 2 is simultaneously the axis of rotation of the slip ring unit, so that the rotor 2 is rotatable about the axis of rotation relative to all the brush elements 1.1, 1.2, 1.3.
  • the new design creates a very compact and reliable grinding ring unit.
  • both digital signals between the relatively rotatable first and second cables 21, 11 and analogous currents between the relatively rotatable third and fourth cables 12, 22 can be transmitted.
  • the design is characterized, inter alia, by the fact that the first cable 21 is guided in the cavity formed by the axially juxtaposed slip rings 2.1.
  • the second brush element 1.2 is arranged with a radial offset X (see FIG. 2) to the third brush element 1.3.
  • This design allows a very reliable electrical transmission, which allows despite the respective sliding contacts insensitive to electromagnetic interference operation.
  • the holder sleeve 1.7 and / or the sleeve-shaped element 1.4 can be arranged radially floating in the slip ring unit.
  • the bearings 3 in particular the bearing 3 located further inside in the housing 1.10.
  • a machine element such as a snap ring
  • the second and the third brush element can be designed such that they absorb radial forces in the sense of a bearing.
  • the operation of the slip ring unit can also be reversed, so that the stator 1 is rotating during operation and the rotor 2 is stationary.

Landscapes

  • Motor Or Generator Current Collectors (AREA)

Abstract

L'invention concerne un ensemble bague collectrice pour la liaison électrique de deux composants (11, 12; 21, 22) pouvant tourner l'un par rapport à l'autre. Un composant est conçu comme un premier câble (21) qui comprend une âme (21.1) et un blindage (21.3). L'ensemble bague collectrice comprend des premier, deuxième et troisième éléments de balai (1.1, 1.2, 1.3) ainsi que des premier, deuxième et troisième corps de frottement (2.1, 2.2, 2.3). Le premier corps de frottement (2.1) comporte un évidement axialement traversant par lequel un premier câble (21) est guidé pour transmettre la tension appliquée à l'âme (21.1). Le deuxième élément de balai (1.2) est en outre disposé avec un décalage axial (X) par rapport au troisième élément de balai (1.3).
EP09778446A 2008-10-15 2009-09-10 Ensemble bague collectrice Active EP2338211B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008051671A DE102008051671A1 (de) 2008-10-15 2008-10-15 Schleifringeinheit
PCT/EP2009/006564 WO2010043290A1 (fr) 2008-10-15 2009-09-10 Ensemble bague collectrice

Publications (2)

Publication Number Publication Date
EP2338211A1 true EP2338211A1 (fr) 2011-06-29
EP2338211B1 EP2338211B1 (fr) 2012-05-16

Family

ID=41259840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09778446A Active EP2338211B1 (fr) 2008-10-15 2009-09-10 Ensemble bague collectrice

Country Status (5)

Country Link
US (1) US8348677B2 (fr)
EP (1) EP2338211B1 (fr)
CN (1) CN102217151B (fr)
DE (2) DE102008051671A1 (fr)
WO (1) WO2010043290A1 (fr)

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DE102011101621A1 (de) * 2011-05-14 2012-11-15 Ltn Servotechnik Gmbh Schleifringeinheit
CN103124037B (zh) * 2011-11-21 2016-07-20 上海新跃仪表厂 强弱电隔离导电滑环
US8986017B2 (en) 2012-10-26 2015-03-24 Oasys Healthcare Corporation Rotatable electric coupling apparatus and method
US20180241166A9 (en) * 2013-03-13 2018-08-23 Mark S. Olsson Rotating contact assemblies for self-leveling camera heads
CN103762475B (zh) * 2014-01-06 2015-08-19 伍浪 高频滑环装置
CN103944029B (zh) * 2014-04-30 2015-12-30 北京航天控制仪器研究所 一种支撑与信号传递一体化轴系
US9228359B2 (en) 2014-05-15 2016-01-05 Dometic Corporation Rotatable awning with illumination
US9695635B2 (en) 2014-05-15 2017-07-04 Dometic Corporation Power track awning assembly
USD805019S1 (en) 2015-05-15 2017-12-12 Dometic Sweden Ab Accessory base
USD805458S1 (en) 2015-05-15 2017-12-19 Dometic Sweden Ab Accessory base
EP3118946B1 (fr) * 2015-07-15 2017-09-13 LTN Servotechnik GmbH Collecteur rotatif et unité comprenant un collecteur rotatif
DE202015105241U1 (de) * 2015-10-05 2017-01-09 Walter Kraus Gmbh Hochfrequenz-Ethernet-Schleifringübertrager
DE102016203762A1 (de) 2016-03-08 2017-09-14 Krones Ag Schleifringübertrager für Rundläufermaschinen
CN107069368B (zh) * 2017-04-28 2019-03-22 北京航天控制仪器研究所 一种ct滑环用组合式碳刷组件
CN110176701B (zh) * 2018-05-30 2021-03-23 中航光电科技股份有限公司 电滑环及其电刷连接环
CN110148866B (zh) * 2019-04-22 2024-03-19 立讯精密工业股份有限公司 导电滑环
DE202020101851U1 (de) * 2020-04-03 2021-07-12 Walter Kraus Gmbh Drehübertrager für Hochfrequenz-Signale
US11951333B2 (en) 2020-09-08 2024-04-09 Shanghai United Imaging Healthcare Co., Ltd. X-ray imaging system for radiation therapy
CN116709990A (zh) * 2020-12-14 2023-09-05 上海联影医疗科技股份有限公司 滑环组件、医疗系统及其方法
CN114252062B (zh) * 2022-03-02 2022-04-29 山东胜工检测技术有限公司 一种海床测距装置及其检测方法

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Also Published As

Publication number Publication date
US20120129360A1 (en) 2012-05-24
WO2010043290A1 (fr) 2010-04-22
US8348677B2 (en) 2013-01-08
DE102008051671A1 (de) 2010-04-22
DE202009018554U1 (de) 2012-01-30
EP2338211B1 (fr) 2012-05-16
CN102217151B (zh) 2013-11-06
CN102217151A (zh) 2011-10-12

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