EP0029375A1 - Elektrische Schleifkontaktvorrichtung mit Mehrfaserbürste und elektrische rotierende Maschine, die eine solche Vorrichtung verwendet - Google Patents

Elektrische Schleifkontaktvorrichtung mit Mehrfaserbürste und elektrische rotierende Maschine, die eine solche Vorrichtung verwendet Download PDF

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Publication number
EP0029375A1
EP0029375A1 EP80401538A EP80401538A EP0029375A1 EP 0029375 A1 EP0029375 A1 EP 0029375A1 EP 80401538 A EP80401538 A EP 80401538A EP 80401538 A EP80401538 A EP 80401538A EP 0029375 A1 EP0029375 A1 EP 0029375A1
Authority
EP
European Patent Office
Prior art keywords
electrical contact
parts
electrical
brush
contact
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.)
Withdrawn
Application number
EP80401538A
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English (en)
French (fr)
Inventor
Michel Amiet
Jean-Pierre Chabrerie
Jacques Barthelemy
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.)
Direction General de lArmement DGA
Gouvernement de la Republique Francaise
Original Assignee
Delegation Generale pour lArmement
Gouvernement de la Republique Francaise
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 Delegation Generale pour lArmement, Gouvernement de la Republique Francaise filed Critical Delegation Generale pour lArmement
Publication of EP0029375A1 publication Critical patent/EP0029375A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres

Definitions

  • the present invention relates to electrical contact devices sliding between two parts moving relatively relative to each other, a first of these parts carrying at least one multifilament brush consisting of a bundle of fine wires embedded by one of its ends in the first part and bearing, at its other end, on at least one contact zone provided on the second part.
  • the object of the present invention is precisely to propose a sliding electrical contact device with a multifilament brush, allowing undifferentiated use, under normal conditions or embedded in a fluid, non-oxidizing and of low viscosity, gaseous or liquid, whatever the pressure. of this gas or liquid.
  • Another object of the present invention is to propose a sliding electrical contact device of this type allowing, in operation in a gas or in a liquid, high current densities, without high differences in contact potential, up to high linear speeds.
  • the multifilament brush consisting of an embedded bundle of fine wires, has a cantilever length advantageously exceeding at least lO% the normal mean spacing between the two parts moving relatively to each other and between which electrical contact must be made.
  • the brush-holder part is normally not stressed towards the second part, that is to say that, unlike traditional brush-holders, it is not essential to provide a device ensuring an application pressure of the brushes on the scrolling contact zone of the other part.
  • Electric sliding contact devices with multifilament brushes are already known, made up of fine wires with a diameter of less than 80 microns, developed essentially to limit electrical losses and imperatively intended to be used for pressing under pressure on a smooth track, in a neutral atmosphere or slight reducing.
  • the applicants have discovered that by maintaining the brush support part at a substantially constant distance from the contact zone of the part making it opposite, without exerting on this brush holder part a pressure tending to press the brushes at the end on the other part, but by giving the free or cantilevered part of the wires of these brushes a length greater than the normal spacing between the two parts, the own elasticity constituent wires of the brushes made it possible to ensure, in a controlled manner, the required contact with the contact zone, at the cost of an elastic deformation by bending of the free end of the wire bundle, thus eliminating the problem of 'application of pressure on the brush holder and, consequently, the conditions of use in a rarefied atmosphere, or in conditions of overpressure.
  • the device according to the present invention allows the production of sliding or rotating electrical contacts when immersed in a gas or a liquid. relatively dielectric and possibly hostile as mentioned above, but also finds an advantageous use in particular arrangements of rotating machines.
  • the present invention also provides a rotary sliding contact device in which at least part of the interface between the first and second parts, facing each other, is occupied by a layer of liquid metal, advantageously disposed on the contact surface of the second room.
  • Another object of the present invention is to overcome these faults effectively, without requiring any auxiliary structural or power equipment, by means of a reliable, simple assembly requiring no maintenance in installing brushes of the type defined above totally immersed at least in the localized contact zones of such chambers with electrical contact by liquid metal, the brushes achieving a "blocking" effect, or, more precisely, braking of the metal vein liquid without inducing harmful disturbances in the flow of this vein while playing a supplementary role ensuring electrical contact in unforeseen cases of leaks or partial vacuum in the chamber.
  • the device shown in Figure 1 comprises a brush holder part 1 and an adjacent part 2 capable of moving relatively relative to one another as shown by the arrow 10 while keeping between the external face of the brush holder 5 and the external face of the electrical contact zone 4 of the part 2 a substantially constant mean spacing e.
  • the part 2 is for example a current distributor rail, the part 1 being a wiper element secured for example to a motor machine.
  • the brush support part 5 is rigidly mounted on the body 6 of the part 1 or, optionally, floating with the interposition of a play take-up device 8 which does not induce any noticeable force on the brush support part 5 in the direction of track 2.
  • the brushes 3, establishing the electrical connection between the parts 1 and 2 and consisting of a bundle of fine metallic wires, good conductors of electricity and easily hardenable comprise a recessed part 9 and a free part or cantilever 9 ′ whose length l is determined to be at least 10% greater, advantageously 15 to 20%, at the spacing e between the parts 1 and 2, so that the free end 9 ′ assumes, in the position of use, a bent configuration shown on the left brush in FIG. 1.
  • Figure 3 a variant of the assembly of Figure 2, wherein the smooth ring 20 has been replaced by a grooved ring 20 'having grooves 22 extending parallel to the axis of rotation, these grooves defining longitudinal ribs 21 at the nominal diameter of the ring 20 '.
  • these grooves have the effect of increasing the difference in contact potential, they promote better resistance over time of the wire bundles 30, 30 ′ and thus make it possible to obtain greater stability over time of this difference in contact potential.
  • FIG. 1 a variant of the assembly of Figure 2, wherein the smooth ring 20 has been replaced by a grooved ring 20 'having grooves 22 extending parallel to the axis of rotation, these grooves defining longitudinal ribs 21 at the nominal diameter of the ring 20 '.
  • the width at the apex X of the grooves 22 is advantageously between 2 and 5 mm, the depth h of these grooves being advantageously of the order of 2 mm, determined so that the bottom of the groove 22 is at a level which cannot be reached by the ends of the wires 3 in their position of complete radial extension.
  • the angle with the faces of the grooves is chosen to be between 45 ° and 60 °, advantageously 60 °.
  • FIG. 5 shows a similar arrangement, but this time applied to a rotary direct current machine, comprising a collector 20 "with blades 23 separated from each other by insulating blades, for example micassées.
  • a rotary direct current machine comprising a collector 20 "with blades 23 separated from each other by insulating blades, for example micassées.
  • the series of parallel rows of bundles of wires 3 possibly having a circular cross section or even a straight section elongated in the direction of travel of the collector blades so as to cover a certain number of these manifold blades to guarantee good switching and favor reversal of the direction of rotation.
  • the brushes son have a small diameter, between about 10 wm and 300 microns advantageously of the order of 60 to 100 microns.
  • the free length l of these wires is relatively small, and is advantageously kept less than 15 mm.
  • the wires are made of hard metal alloy, with good elasticity, having good conductivity, for example, of cadmium bronze or of FeSi alloy and are obtained by drawing, possibly followed by work hardening.
  • the transverse resistance of the wire bundles can be artificially increased by isolating the wires from each other for example by coating them individually with a sheath, and by fitting them into a resistant base 51 as shown in FIG. 6.
  • the flexibility of the brushes son and their low abrasive nature allow for the tracks or contact areas 4 of the rings 20, 20 'any suitable electrically conductive material, such as copper or copper-zirconium alloys.
  • the brushes 3 can be embedded directly in a copper support 5, or, as shown in Figure 6, with their inner ends engaged in a bowl 52, formed in a piece of copper 50, the embedding the wires and determining their free length being obtained by a perforated plate 51 made of insulating material.
  • a perforated plate 51 made of insulating material.
  • the same structure can be adopted, with a plate 51 no longer made of a material which is not electrically conductive but of a material, on the contrary, a good conductor forming a radiator for the evacuation of the heat dissipated in the wires.
  • each bundle being constituted by a bundle of threads folded in a hairpin and held in the bowl 52 by a loop 53, for example in lai thread tone, the beams being connected on the rear face of the plate 50 by another brass wire 54.
  • the wires are brought together in bundles having a diameter less than or equal to 10 mm, and are assembled in parallel rows close to one another, so that the wires of the different bundles can touch in bending.
  • the beams can be arranged in a staggered fashion as a function of the expected current density.
  • the device according to the present invention allows current densities up to 100 A / cm 2 at running speeds. linear up to 40 m / s -1 and beyond, allowing service lives, immersion in non-oxidizing dielectric liquids or gases up to several thousand hours. These characteristics can be further increased by incorporating, in the wire bundles, lubricating filaments.
  • the device according to the present invention has proved effective for occasional uses in any relatively non-oxidizing liquid or gas and with a resistivity of less than 0.5 ohms per meter (for example salted sea water), the very low abrasive effect of the brushes on the contact surface of the second part, making it possible to keep a thin protective film of gold deposited on this surface for a long period of time.
  • liquids of viscosity less than 100 centipoise such as mineral oils, hydrocarbons or potassium brines, the device has proved very satisfactory in endurance.
  • the ability of the brushes to maintain the electrical contact in immersion in a liquid, even at high speeds, also makes it possible to use the electrical contact device according to the present invention in rotary systems with electrical contact ensured, at least partially, by a liquid metal compatible with the material of the brushes, such as HgIn or the NaK eutectic.
  • a liquid metal compatible with the material of the brushes such as HgIn or the NaK eutectic.
  • FIG. 7 A particularly important development of the present invention has been shown in FIG. 7.
  • a homopolar machine with liquid metal contact the external induction Bo being created for example by a superconductive solenoid to reach values of the order of a few Tesla.
  • the disc 200 integral with the shaft 40 of the rotor is mounted in a cylindrical chamber 41 so as to define, with the stator carcass elements 100, 101 two annular zones of localized contact I and II for the passage of current i, the path is shown in dashed lines, the closing of the current circuit being ensured, in the contact zones, by the liquid metal 42 at least partially filling the chamber 41, this metal or alloy having wetting agent characteristics, high conductivity and having a wide temperature zone between the boiling point and the freezing point.
  • the electrically insulated surfaces of the chamber are represented in hatching of insulation.
  • the contact zones I and II are arranged between the stationary elements 100 and 101 and the periphery of the disc 200 at least two rows of bundles of wires 30 of the type defined above, which have in particular their object to "calm”, or block the rotation due to Laplace forces of the liquid metal vein in these areas by significantly slowing the relative overspeeds of these veins and thus allowing improved operation, at low cost, of the machine for high rotational speeds.

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  • Motor Or Generator Current Collectors (AREA)
EP80401538A 1979-11-08 1980-10-30 Elektrische Schleifkontaktvorrichtung mit Mehrfaserbürste und elektrische rotierende Maschine, die eine solche Vorrichtung verwendet Withdrawn EP0029375A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7927526 1979-11-08
FR7927526A FR2469813A1 (fr) 1979-11-08 1979-11-08 Dispositif de contact electrique glissant a balai multifilamentaire

Publications (1)

Publication Number Publication Date
EP0029375A1 true EP0029375A1 (de) 1981-05-27

Family

ID=9231421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401538A Withdrawn EP0029375A1 (de) 1979-11-08 1980-10-30 Elektrische Schleifkontaktvorrichtung mit Mehrfaserbürste und elektrische rotierende Maschine, die eine solche Vorrichtung verwendet

Country Status (3)

Country Link
US (1) US4483574A (de)
EP (1) EP0029375A1 (de)
FR (1) FR2469813A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038892A1 (de) * 1980-04-29 1981-11-04 Westinghouse Electric Corporation Bürsten mit isolierter Faser für eine dynamoelektrische Maschine
DE102005055706B4 (de) * 2004-12-02 2013-12-05 Deutsch-Französisches Forschungsinstitut Saint-Louis Mobile elektrische Kontaktvorrichtung mit großer Leiterlänge

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4767957A (en) * 1986-12-08 1988-08-30 General Electric Company Liquid metal collector for acyclic generator
US6666864B2 (en) * 2001-06-29 2003-12-23 Scimed Life Systems, Inc. Electrophysiological probes having selective element actuation and variable lesion length capability
US6734588B2 (en) * 2001-08-02 2004-05-11 Siemens Westinghouse Power Corporation Sectioned conductor and related methods for accommodating stress and avoiding internal deformations in power generator
DE10215809B4 (de) * 2002-04-10 2008-09-25 Schleifring Und Apparatebau Gmbh Schleifkontaktanordnung
US7557485B1 (en) * 2004-10-08 2009-07-07 The United States Of America As Represented By The Secretary Of The Navy Ion conducting electrolyte brush additives
US8604653B2 (en) 2005-06-25 2013-12-10 Inpro/Seal, LLC Current diverter ring
US20110204734A1 (en) 2005-06-25 2011-08-25 Orlowski David C Motor Grounding Seal
US8664812B2 (en) 2006-03-17 2014-03-04 Inpro/Seal Llc Current diverter ring
US20090045694A1 (en) * 2007-08-15 2009-02-19 Oh Hieyoung W Microfiber high current conduction device
US7614907B2 (en) * 2008-02-12 2009-11-10 Chaojiong Zhang Contact terminal with self-adjusting contact surface
DE102008001361A1 (de) * 2008-04-24 2009-11-05 Schleifring Und Apparatebau Gmbh Mehrfachbürste für Schleifringe
TW201108531A (en) * 2009-04-09 2011-03-01 Inpro Seal Llc Current diverter ring
CN102371573A (zh) * 2010-08-10 2012-03-14 南京德朔实业有限公司 电动工具
DE102011053979B4 (de) * 2011-09-27 2017-12-28 Walter Maschinenbau Gmbh Schleifkontakteinrichtung einer Erodiereinrichtung einer kombinierten Schleif- und Erodiermaschine und Verfahren zur Herstellung einer Schleifkontakteinrichtung
EP2862245B1 (de) 2012-06-18 2025-05-28 Inpro/Seal LLC Stromumlenkring
US9831739B2 (en) 2012-06-18 2017-11-28 Inpro/Seal Llc Explosion-proof current diverting device
DE112013007090T5 (de) * 2013-05-17 2016-01-28 Schleifring Und Apparatebau Gmbh Hochstrom-Schleifring für Multifaserbürsten
EP3207626B1 (de) * 2014-10-17 2021-06-02 Moog Inc. Supraleitende vorrichtungen wie z. b. schleifringe und gleichpolige motoren/generatoren
US9871334B2 (en) * 2016-02-23 2018-01-16 Sikorsky Aircraft Corporation Slip ring having a liquid metal contact between a stationary element and a rotatable element
US12231007B2 (en) 2020-07-01 2025-02-18 Illinois Tool Works Inc. Systems and methods to mitigate electrical voltage on a rotating shaft immersed in oil
WO2024249121A2 (en) * 2023-05-30 2024-12-05 Atomic Machines, Inc. Electrical contacts using an array of micromachined flexures

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1495780A (en) * 1923-04-16 1924-05-27 Westinghouse Electric & Mfg Co Current-collecting device
GB1396309A (en) * 1971-05-13 1975-06-04 Int Research & Dev Co Ltd Electrical machines
FR2404936A1 (fr) * 1977-10-03 1979-04-27 Anvar Perfectionnements aux dispositifs de contact electrique glissant

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DE620087C (de) * 1933-05-24 1935-10-14 Ottomar Kasperowski Dr Ing Geschichtete Kohlebuerste fuer Gleich- oder Wechselstrom-Kollektormaschinen
DE894277C (de) * 1943-12-02 1953-10-22 Siemens Ag Kohlebuerste fuer Kommutatormaschinen
US3052764A (en) * 1959-12-21 1962-09-04 Rugeris John De Rider for brush on commutator
GB1332786A (en) * 1969-12-16 1973-10-03 Int Research & Dev Co Ltd Current transfer devices in homopolar electrical machines
US3886386A (en) * 1973-08-01 1975-05-27 Gen Electric Carbon fiber current collection brush
BE525532A (de) * 1974-01-11
US4168446A (en) * 1978-02-10 1979-09-18 General Electric Company Liquid metal current collector with compliant brush having flooded filaments
US4337407A (en) * 1980-04-29 1982-06-29 Westinghouse Electric Corp. Insulated strand brushes
US4358699A (en) * 1980-06-05 1982-11-09 The University Of Virginia Alumni Patents Foundation Versatile electrical fiber brush and method of making

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1495780A (en) * 1923-04-16 1924-05-27 Westinghouse Electric & Mfg Co Current-collecting device
GB1396309A (en) * 1971-05-13 1975-06-04 Int Research & Dev Co Ltd Electrical machines
FR2404936A1 (fr) * 1977-10-03 1979-04-27 Anvar Perfectionnements aux dispositifs de contact electrique glissant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038892A1 (de) * 1980-04-29 1981-11-04 Westinghouse Electric Corporation Bürsten mit isolierter Faser für eine dynamoelektrische Maschine
DE102005055706B4 (de) * 2004-12-02 2013-12-05 Deutsch-Französisches Forschungsinstitut Saint-Louis Mobile elektrische Kontaktvorrichtung mit großer Leiterlänge

Also Published As

Publication number Publication date
US4483574A (en) 1984-11-20
FR2469813B1 (de) 1983-05-13
FR2469813A1 (fr) 1981-05-22

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19810702

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Inventor name: AMIET, MICHEL

Inventor name: CHABRERIE, JEAN-PIERRE

Inventor name: BARTHELEMY, JACQUES