EP2923419B1 - Ringelektrode für einen schleifring, entsprechender schleifring und verfahren zur herstellung einer ringelektrode - Google Patents

Ringelektrode für einen schleifring, entsprechender schleifring und verfahren zur herstellung einer ringelektrode Download PDF

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Publication number
EP2923419B1
EP2923419B1 EP13789351.7A EP13789351A EP2923419B1 EP 2923419 B1 EP2923419 B1 EP 2923419B1 EP 13789351 A EP13789351 A EP 13789351A EP 2923419 B1 EP2923419 B1 EP 2923419B1
Authority
EP
European Patent Office
Prior art keywords
ring
set forth
electrodes
electrode
ring electrode
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.)
Active
Application number
EP13789351.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2923419A1 (de
Inventor
Stephan Ott
Harry Schilling
Robert RAUM
Dennis Hoff
Ronald Suchanecki
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.)
Moog GAT GmbH
Original Assignee
GAT Gesellschaft fuer Antriebstechnik mbH
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 GAT Gesellschaft fuer Antriebstechnik mbH filed Critical GAT Gesellschaft fuer Antriebstechnik mbH
Publication of EP2923419A1 publication Critical patent/EP2923419A1/de
Application granted granted Critical
Publication of EP2923419B1 publication Critical patent/EP2923419B1/de
Active legal-status Critical Current
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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
    • H01R39/14—Fastenings of commutators or slip-rings to shafts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/10—Manufacture of slip-rings
    • 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
    • H01R39/022—Details for dynamo electric machines characterised by the materials used, e.g. ceramics
    • H01R39/025—Conductive materials
    • 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
    • H01R39/08—Slip-rings
    • 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
    • H01R39/08—Slip-rings
    • H01R39/10—Slip-rings other than with external cylindrical contact surface, e.g. flat slip-rings
    • 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
    • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof
    • 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
    • H01R39/26—Solid sliding contacts, e.g. carbon brush
    • 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
    • H01R39/38—Brush holders
    • H01R39/385—Means for mechanical fixation of the brush holder

Definitions

  • the present invention relates to a ring electrode for a slip ring for transmitting electrical drive energy between machine parts, at least one of which is rotatable relative to another.
  • the EP 2426 793 discloses a Schleifringbürstensystem for a current-excited synchronous motor with ring electrodes according to the preamble of claim 1.
  • the material for the ring electrodes Cu or Cu alloys, CuZn, CuSn, AG or Ag alloys, Au or Au alloys, steel or a coating of Ni or Co or galvanized Au layer considered, wherein for the slip rings, a CuAg alloy in terms of electrical properties and a CuSn alloy are mentioned in terms of wear as preferred materials.
  • slip rings and closed ring electrodes on motors or generators can be found in US Pat FR 2,088,839 , of the US 2002/1071313 and the US 2003/0137210
  • slip rings find use on a variety of rotating machinery, especially when electrically powered, such as machine tools, certain types of electric motors, and the like.
  • slip rings with ring electrodes of larger diameter are typically also used in computer tomographs.
  • slip rings are used not only for the transmission of drive energy, but also for the transmission of electrical signals.
  • circular or annular slip paths referred to herein as "ring electrodes” are attached to a first machine part.
  • ring electrodes On a second machine part is a sliding contact, which rests with a certain contact pressure on the sliding track or the ring electrode.
  • One of the two machine parts is rotatable relative to the other, so that the sliding contact moves along the entire circumference on the surface of the ring electrode and thereby remains in constant electrical contact with the ring electrode.
  • the electrodes may optionally be in contact with the outer or inner peripheral surface of the ring electrode, but they may as well come into contact with a side surface of the ring, which (in the case of a flat ring) has the advantage that this contact surface is within the same plane lies.
  • the Ring electrode may in principle have any cross-section, but rectangular cross-sections are preferred because they provide flat bearing surfaces for the sliding contacts.
  • Corresponding ring electrodes typically consist of brass or bronze. They are usually made by separating individual rings from a tube of appropriate diameter or by cutting out of solid plates, for example by means of a laser.
  • the present invention based on the object to provide ring electrodes and corresponding slip rings, as well as a method for their preparation, which avoid at least one of the aforementioned disadvantages.
  • the aim is, inter alia, a simplified production and less wear in the use of ring electrodes and corresponding slip rings. Furthermore or alternatively, the contact noise and also the contact resistance should be reduced.
  • the ring electrode and a corresponding slip ring should be particularly suitable for use in computer tomography and similar medical devices for the representation of body cross sections and preferably optimized for this purpose.
  • a ring electrode the electrode consists of a rod material made of stainless steel, which is rolled into a ring and the free ends are brought together in a closed ring, wherein the diameter of the ring electrode in a range of 40 cm 2 m ..
  • One advantage of producing an electrode from a stainless steel rod is, inter alia, that virtually no or only a very small material waste occurs, since the rod material only has to be cut off to the length required for a ring.
  • Such bar material is often wound on large-diameter rolls and is thus practically available as a continuous material.
  • bar material any material having a constant cross-section and a diameter at least a hundred times the length.
  • rod material also includes wire cross sections from 16 mm 2 up to cross sections of, for example, 30x30 mm 2 , without any limitations being associated with these cross-sectional details.
  • the free ends of the rod formed into a closed ring are then opposite each other on impact.
  • the rod is also embedded in an insulating plastic carrier material, so that at most remains a negligible for practical purposes gap between the free ends of the annularly bent rod.
  • such a plastic carrier material should be suitably selected so that it has a coefficient of thermal expansion which corresponds as well as possible with the thermal expansion coefficient of the ring electrode made of stainless steel.
  • the coefficient of thermal expansion in the range of an operating and transport temperature between -40 and + 80 ° C, at least within a factor 2 should be in the range of the thermal expansion coefficient of stainless steel.
  • the rod or rod material used to make a particular ring should preferably have a certain small excess length because this allows the free ends of the overall ring-rolled rod to be superposed and along a miter cut to the desired one To bring length. As a result, a good overlap for a sliding over the butt weld sliding contact is ensured in each case.
  • the opposing free ends of the ring can of course also be welded together or brazed.
  • the corresponding weld seam is not exactly radial with respect to the ring axis, but significantly inclined relative to the radial direction.
  • the area of a weld on the ring electrode is preferably smoothed by milling, turning or grinding, so that excessive wear of the sliding contacts in the region of the weld is avoided.
  • the ring in the region of the weld can also be annealed to some degree by heating so that this region has substantially the same friction characteristics for the sliding contacts as the remainder of the ring electrode.
  • a corresponding slip ring for transmitting electrical energy between a stationary and a rotating machine part, which has an insulating carrier material, which likewise has the shape of a ring, is inventively characterized in that the slip ring has at least one ring electrode of the type described above.
  • the electrode is embedded in the carrier material of the slip ring and has only a slight projection over a corresponding surface of the carrier material.
  • a slip ring may also have a plurality of ring electrodes of the type described above.
  • the plurality of ring electrodes of a slip ring have different diameters and are arranged concentrically in a common radial plane, i. in a plane perpendicular to the common ring axis.
  • the plurality of ring electrodes each have the same diameter and arranged in parallel in a common cylinder surface of the annular or cylindrical support material. It goes without saying in addition to the at least one ring electrode made of stainless steel according to the invention, further ring electrodes can also be arranged on a slip ring, which consist of another conductive material, in particular of brass.
  • the corresponding sliding contacts or tap electrodes are in touching contact with the at least one ring electrode made of stainless steel and are preferably metal-containing carbon electrodes.
  • carbon electrodes with a silver content of up to 60% or a copper content of up to 75% have proven suitable for combination with stainless steel ring electrodes.
  • a plurality of carbon electrodes are arranged as sliding contacts on a common tap rail in a slip ring for each ring electrode.
  • the available contact surface between the ring and sliding contact is significantly increased and you can optimize the contact pressure and thus highlighted friction and wear to the effect that forms an ideal patina for the transfer.
  • the low initial wear of the listed material combinations in combination with ambient air humidity leads to a coating of the ring electrodes with the sliding contact material, which has a markedly positive effect on the properties with regard to contact resistance, contact noise and further wear behavior.
  • the method according to the invention for producing corresponding ring electrodes has already been implicitly described above and is characterized by using a rod material made of stainless steel, the length of a corresponding stainless steel rod corresponding at least to the circumference of the ring electrode to be produced, rolling the rod into a ring shape with the desired diameter, welding the merged free ends of the rod formed in a ring and smoothing or grinding the weld area on the surface of the welded ring.
  • a rod material with a rectangular cross-section is preferably used.
  • the preferred materials for the stainless steel of a ring electrode are, for example, stainless steels with high chromium and carbon content, such as are available as steels of the types X10Cr13 or X20Cr13.
  • FIG. 1 in plan view a ring 1 shown schematically, which consists of stainless steel and its cross-section, for example, according to FIG. 3 square with dimensions of 10x10 mm 2 can be.
  • the section A is in the upper part of FIG. 1 shown enlarged and indicated schematically by a dashed line to a weld 8, which runs along a miter cut.
  • FIG. 2 shows a plan view of a slip ring, which consists of a carrier disc 5 in ring form, which is made of an insulating plastic material, preferably polyurethane with a mineral filler, wherein the filler ensures that the plastic material has a total of a coefficient of thermal expansion, in the Magnitude of the thermal expansion of stainless steel and at least in the interesting temperature range of -40 ° to 80 ° C differs by less than a factor of 2 from the coefficient of expansion of stainless steel.
  • a slip ring which consists of a carrier disc 5 in ring form, which is made of an insulating plastic material, preferably polyurethane with a mineral filler, wherein the filler ensures that the plastic material has a total of a coefficient of thermal expansion, in the Magnitude of the thermal expansion of stainless steel and at least in the interesting temperature range of -40 ° to 80 ° C differs by less than a factor of 2 from the coefficient of expansion of stainless steel.
  • the carrier disk 5 has a total of four embedded slip rings 1, 2, 3 and 4.
  • the common axis 10 of the carrier disc 5 and the rings 1, 2, 3 and 4 is indicated in the center of the disc.
  • FIG. 3 shows a cross section through the carrier disc 5 with the four embedded Ring electrodes 1, 2, 3 and 4, which protrude slightly over the surface 6 extending in a radial plane.
  • the projection of the surfaces of the ring electrodes 1, 2, 3 and 4 with respect to the surface 6 may, for example, be between 1 and 3 mm.
  • the square in cross-section ring electrodes 1, 2, 3 and 4 are each embedded to more than half in the material of the support disk 5.
  • the parallel to the radial plane 6 extending surfaces of the ring electrodes 1, 2, 3 and 4 are preferably in turn smoothed, for example by grinding, turning or milling and lie together in a plane parallel to the plane 6 6 ', which is indicated by a dashed line.
  • FIG. 4 schematically shows a side view of a ring electrode 1, which is in sliding contact with a carbon brush 11, wherein the carbon brush, again only schematically, is shown in section.
  • the carbon brush 11 consists overall of a metal-filled or metal-impregnated graphite block 12, a guide sleeve 13, a cap 14 and a spring 15, which holds the graphite block 12 in engagement with the surface of the ring electrode 1.
  • the carbon brush 11 is typically mounted in a rail of a brush block 21 as shown in FIG FIG. 5 is shown.
  • sleeve 13, cap 14 and spring 15 made of an electrically conductive material, typically made of metal and optionally may also be a flat, flexible contact lug or line between spring 15 and graphite block 12 may be arranged with a free end with the cap 14th and / or the sleeve 13 is connected to produce a good electrical contact between graphite block 12 and sleeve 13 and cap 14.
  • a plurality of carbon brushes 11 are connected to an electrically conductive contact rail 22 of a brush block 21, specifically accommodated in each case in a matching bore of the contact rail 22.
  • the sleeve 13 could be pressed or shrunk into a bore of the rail, optionally also be soldered or screwed and is connected in this way firmly and electrically conductive with the contact rail 22.
  • carbon brushes 11 can simultaneously and consecutively lying with the same ring electrode 1 in sliding contact.
  • the holes for receiving the carbon brushes 11 on the contact rail 22 follow the arcuate course of a ring electrode 1, but this is generally not required for large diameters of the ring electrode as well as linearly arranged on a short distance carbon brushes despite a slight curvature of the ring electrode keep in touch ..
  • the adjacent contact rails 23, 24 are shown here without carbon brushes, but of course generally in turn also carbon brushes 11, with adjacent Ring electrodes, for example, the ring electrodes 2 and 3 according to FIG. 3 , contact. It is understood that the housing 25 of the brush block 21 is electrically insulating, so that the individual contact rails 22, 23, 24 fastened thereto are electrically insulated from one another.
  • the sliding contacts are held under spring bias in contact with the surface of the ring electrodes 1, 2, 3 and 4, wherein either the support plate 5 with the ring electrodes 1, 2, 3 and 4 or a machine part, on which mounted the sliding contacts are about the common axis 10 rotates, the sliding contacts are continuously in contact with the surface of the ring electrodes 1, 2, 3 and 4 and in this way can transmit electrical energy or power continuously.
  • the method according to the invention for producing the ring electrodes by rolling from stainless steel also has the advantage that rings or ring electrodes of virtually any diameter can be produced from one and the same rod material as long as the material can only be rolled to a desired diameter.
  • the surfaces have and retain a high quality and the material is extremely resistant to wear and has little friction against metal-containing graphite electrodes, so that the overall wear of the system Slip ring and sliding contact remain extremely low while providing excellent performance in terms of ampacity and signal quality.
  • the ring electrodes and slip rings according to the invention are particularly suitable for use on medical imaging devices with rotating sensors or sensors or radiation emitters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
EP13789351.7A 2012-11-23 2013-11-13 Ringelektrode für einen schleifring, entsprechender schleifring und verfahren zur herstellung einer ringelektrode Active EP2923419B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012111381.5A DE102012111381A1 (de) 2012-11-23 2012-11-23 Ringelektrode für einen Schleifring, entsprechender Schleifring und Verfahren zur Herstellung einer Ringelektrode
PCT/EP2013/073678 WO2014079743A1 (de) 2012-11-23 2013-11-13 Ringelektrode für einen schleifring, entsprechender schleifring und verfahren zur herstellung einer ringelektrode

Publications (2)

Publication Number Publication Date
EP2923419A1 EP2923419A1 (de) 2015-09-30
EP2923419B1 true EP2923419B1 (de) 2017-02-01

Family

ID=49554293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13789351.7A Active EP2923419B1 (de) 2012-11-23 2013-11-13 Ringelektrode für einen schleifring, entsprechender schleifring und verfahren zur herstellung einer ringelektrode

Country Status (7)

Country Link
US (1) US9595800B2 (ja)
EP (1) EP2923419B1 (ja)
JP (1) JP6654043B2 (ja)
KR (1) KR102133616B1 (ja)
CN (1) CN104823340B (ja)
DE (1) DE102012111381A1 (ja)
WO (1) WO2014079743A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8587648B2 (en) * 2004-06-01 2013-11-19 SeeScan, Inc. Self-leveling camera head
EP3217487B1 (en) * 2016-03-08 2019-05-08 Schleifring GmbH Modular slip ring system
US9894767B1 (en) 2016-03-20 2018-02-13 Jason Krugman Products, LLC Concentric circle printed circuit board electrical connection
CN107230921B (zh) * 2017-05-03 2019-06-18 北京航天控制仪器研究所 一种超大型ct滑环的绝缘本体拼接结构
CN107732629A (zh) * 2017-11-14 2018-02-23 九江精达检测技术有限公司 一种微小型导电滑环的勾焊式焊接方法

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US1393564A (en) * 1918-08-10 1921-10-11 Westinghouse Electric & Mfg Co Method of making current-collector rings
US1833747A (en) * 1928-10-31 1931-11-24 Gen Electric Method of making annular members
GB896248A (en) * 1959-11-05 1962-05-16 Bosch Gmbh Robert Improvements in or relating to slip rings for a.c. generators
US3153163A (en) * 1961-03-30 1964-10-13 Gen Electric Moving electric current collectors
GB1118628A (en) * 1964-12-08 1968-07-03 Gen Electric Co Ltd Improvements in or relating to electrostatic clutches and brakes
US3616589A (en) * 1968-10-31 1971-11-02 James L Sherard Fiber reinforced concrete
FR2088839A6 (ja) * 1970-04-27 1972-01-07 Ducellier & Cie
NL155324B (nl) 1970-06-26 1977-12-15 Westerschelde Comb Werkwijze voor het onder water funderen van een bouwelement.
JPS58130743A (ja) * 1982-01-27 1983-08-04 Hitachi Ltd 充電用交流発電機
US4447752A (en) * 1982-06-07 1984-05-08 The Charles Stark Draper Laboratory, Inc. Ball contact slip ring assembly
JPH04137476A (ja) * 1990-09-28 1992-05-12 Tanaka Kikinzoku Kogyo Kk 摺動集電装置
JPH04170571A (ja) * 1990-11-01 1992-06-18 Mita Ind Co Ltd 通電装置
US5612584A (en) * 1995-05-15 1997-03-18 Ford Motor Company Slip ring assembly with reinforcement ring
DE19712939A1 (de) * 1997-03-27 1998-10-01 Freudenberg Carl Fa Verfahren zur Herstellung eines spanlos umgeformten Metallrings
JPH11162608A (ja) * 1997-11-28 1999-06-18 Shimadzu Corp スリップリング装置
US20020171313A1 (en) * 2001-05-16 2002-11-21 Queener David Paul Slip ring and method of manufacturing slip ring
US20030137210A1 (en) 2001-08-17 2003-07-24 Southall Otway Archer Integrated commutator and slip-ring with sense magnet
JP2004202499A (ja) * 2002-12-24 2004-07-22 Jfe Steel Kk 金属製リング状素形材の製造方法
US20040169434A1 (en) * 2003-01-02 2004-09-02 Washington Richard G. Slip ring apparatus
JP2005261153A (ja) * 2004-03-15 2005-09-22 Denso Corp 車両用交流発電機
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EP2426793A1 (de) * 2010-09-01 2012-03-07 Brusa Elektronik AG Schleifringbürstensystem für stromerregten Synchronmotor

Also Published As

Publication number Publication date
DE102012111381A1 (de) 2014-05-28
CN104823340B (zh) 2017-09-29
CN104823340A (zh) 2015-08-05
EP2923419A1 (de) 2015-09-30
US20150295376A1 (en) 2015-10-15
US9595800B2 (en) 2017-03-14
WO2014079743A1 (de) 2014-05-30
JP2015537350A (ja) 2015-12-24
KR20150089020A (ko) 2015-08-04
JP6654043B2 (ja) 2020-02-26
KR102133616B1 (ko) 2020-07-14

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