US3835436A - High speed electrical contact device including a rotating liquid contact element - Google Patents

High speed electrical contact device including a rotating liquid contact element Download PDF

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Publication number
US3835436A
US3835436A US00362832A US36283273A US3835436A US 3835436 A US3835436 A US 3835436A US 00362832 A US00362832 A US 00362832A US 36283273 A US36283273 A US 36283273A US 3835436 A US3835436 A US 3835436A
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US
United States
Prior art keywords
rotatable member
contact
contact element
electrically conductive
liquid
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.)
Expired - Lifetime
Application number
US00362832A
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English (en)
Inventor
P Klaudy
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
Application granted granted Critical
Publication of US3835436A publication Critical patent/US3835436A/en
Anticipated expiration legal-status Critical
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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
    • H01R39/64—Devices for uninterrupted current collection
    • H01R39/646—Devices for uninterrupted current collection through an electrical conductive fluid

Definitions

  • An electrical contact device for high currents and high current pickup speeds comprises a ring-shaped rotating metallic contact element, with the inner circumference of which a roller-shaped contact element that is made of solid material and rotates about an axis, is in electrical contact.
  • the speed on the circumference of the roller-shaped contact element fully or almost fully coincides with the speed on the inner circumference of the ring-shaped contact element.
  • the ring-shaped contact element consists of an highly electrically conductive contact liquid which is held in an open groove by centrifugal force. The contact resistance and the friction losses of the contact device are very small.
  • the invention relates to an electrical contact device for high currents and high current pickup speeds comprising a ring-shaped, rotating metallic contact element, with the inner circumference of which a rollershaped contact element that is made of solid material and which rotates about an axis, is in electrical contact, the speed on the circumference of the roller-shaped contact element fully or almost fully coinciding with the speed on the inner circumference of the ringshaped contact element.
  • roller contacts for transmitting high currents at high contact speeds have also been suggested.
  • a contact device with roller contacts described in German Patent 704,671, embodies a ring-shaped, rotating metallic contact element of solid material with the inner circumference of which a roller-shaped contact element of solid material revolvable around an axis is in electrical contact. Since the roller-shaped contact element is thereby driven by the ring-shaped contact element, the speed on the circumference of the rollershaped contact element roughly coincides with the speed on the inner circumference of the ring-shaped contact element of this contact device.
  • the aim is to attain contact with minimum contact resistance and minimum friction losses. Furthermore, corrosion phenomena on the contact surfaces are to be avoided as far as possible.
  • an electrical contact device comprises a ring-shaped rotating metallic contact element with the inner circumference of which a roller-shaped contact element made of solid material and capable of rotating around an axis is in electrical contact, the speed on the'circumference of the roller-shaped contact element fully or almost fully coinciding with the speed on the inner circumference of the ring-shaped contact element, the ring shaped contact element consisting of highly electrically conductive contact liquid held, in an open groove by centrifugal force.
  • the peripheral speed of the roller-shaped contact element can be approximated to the speed on the inner circumference of the ring-shaped contact element, i.e. to the speed of the rotating contact liquid ring, by letting the roller-shaped contact element roll over the surface of the contact liquid.
  • roller-shaped contact element has a separate drive of its own which matches the speed on the circumference of the rollershaped contact element either fully or almost fully to the speed on the inner circumference of the ringshaped contact element.
  • roller-shaped contact element may also be advantageous if the surface of the roller-shaped contact element is provided with grooves.
  • FIG. 1 shows an exemplary form of design of a contact device in accordance with the invention.
  • FIGS. 1 and 2 exemplify an preferred form of design of a contact device in'accordance with the invention.
  • FIG. 2 shows a cross-section through the device depicted in'FIG. 1, namely along the cross-section line II- II.
  • the contact device comprises a ring-shaped contact element 1 made of an highly electrically conductive contact liquid, e.g. mercury, and a rollershaped contact element 2 made of solid contact material, e.g. an highly electrically conductive metal.
  • the contact liquid ring I is held in a rotating groove 3 by centrifugal force, this groove being secured to a large contact disc 4 or to the rotor of a machine.
  • roller-shaped contact elements 2 may also be provided.
  • the roller-shaped contact elements 2 are well connected conductively with shafts 5, which are supported in bearings 6.
  • the roller-shaped contact elements 2 are immersed somewhat along part of the roller surface in the rotating contact liquid ring 1.
  • the peripheral speed v, of the contact roller 2 or contact rollers respectively is 50 selected that it equals or almost equals speed v of the rotating contact liquid ring 1. This can be attained, as already mentioned, by letting the contact roller 2 roll direct over the surface of the contact-liquid ring 1 or what is still more advantageous for avoiding undesirable slip by having contact roller 2 driven separately so that its surface speed coincides or almost coincides with the speed of the contact liquid. Slip friction between the contact liquid and the contact roller is then almost completely avoidable and the mechanical losses remain slight even 4 at high peripheral speeds of the contact liquid.
  • FIGS. 3 and 4 depict such a contact roller 11 with grooves 12 on its circumference. It is advantageous to immerse the contact roller 11 in the contact liquid 13 only until the tooth-like protuberances between the grooves do not lie entirely in the contact liquid, i.e. so that the grooves 12 are not immersed in the contact liquid right down to their base. The contact liquid is then able to escape laterally into the vacated spacesnext to the teeth. Eddy formations and splashing are then avoided.
  • An electrical contact device comprising:
  • a first electrically conductive annular rotatable member including a radially inwardly directed groove
  • annular contact element comprising an electrically conductive liquid, disposed in'said groove, said liquid being held in said groove by centrifugal force produced by rotation of said first rotatable member;
  • a second electrically conductive annular rotatable member having the peripheral surface thereof in contact with said liquid contact element for electrically coupling said first rotatable member thereto, said second rotatable member being driven by said contact element so that the velocity of the radially inner surface of said contact element approximately equals the peripheral speed of said second rotatable member.
  • An electrical contact device comprising:
  • a first electrically conductive annular rotatable member including a radially inwardly directed groove
  • annular contact element comprising an electrically conductive liquid, disposed in said groove, said liquid being held in said groove by centrifugal force produced by rotation of said first rotatable member;

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Friction Gearing (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)
US00362832A 1972-05-23 1973-05-22 High speed electrical contact device including a rotating liquid contact element Expired - Lifetime US3835436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT443372A AT315956B (de) 1972-05-23 1972-05-23 Flüssigkeitskontakt

Publications (1)

Publication Number Publication Date
US3835436A true US3835436A (en) 1974-09-10

Family

ID=3563957

Family Applications (1)

Application Number Title Priority Date Filing Date
US00362832A Expired - Lifetime US3835436A (en) 1972-05-23 1973-05-22 High speed electrical contact device including a rotating liquid contact element

Country Status (8)

Country Link
US (1) US3835436A (xx)
JP (1) JPS4950404A (xx)
AT (1) AT315956B (xx)
CA (1) CA988594A (xx)
CH (1) CH555095A (xx)
DE (1) DE2325398A1 (xx)
FR (1) FR2185871B1 (xx)
GB (1) GB1433143A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733038A (en) * 1985-11-22 1988-03-22 Charmilles Technologies S.A. Contact member for supplying electrical current to an electro-erosion wire electrode
US5696526A (en) * 1983-04-19 1997-12-09 Canon Kabushiki Kaisha Method of driving optical modulation device
US20030129855A1 (en) * 2001-12-21 2003-07-10 Douglas Richard E. Current collector assembly and method
US20170244209A1 (en) * 2016-02-23 2017-08-24 Sikorsky Aircraft Corporation Rotor system slip ring assemblies
US20190157947A1 (en) * 2016-09-06 2019-05-23 Bayerische Motoren Werke Aktiengesellschaft Drive Device for a Motor Vehicle
US20220255277A1 (en) * 2019-07-02 2022-08-11 Ford Global Technologies, Llc Current transferring device for an electric machine and an electric machine with the same, and a vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4566744A (en) * 1983-06-28 1986-01-28 Skf Industrial Trading & Development Company B.V. Current collector for rotating shaft

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3135840A (en) * 1962-07-19 1964-06-02 Electro Mechanical Res Inc High-speed commutators for switching units
US3295091A (en) * 1964-11-26 1966-12-27 Mossin Oskar Von Liquid contact arrangement between relatively rotatable conductors
US3444408A (en) * 1967-08-25 1969-05-13 Gen Electric Liquid metal electrical collector
US3573521A (en) * 1970-03-05 1971-04-06 Gen Electric Conductor blade for a liquid metal collector
US3604967A (en) * 1970-04-10 1971-09-14 Gen Electric Liquid metal collector velocity divider

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3135840A (en) * 1962-07-19 1964-06-02 Electro Mechanical Res Inc High-speed commutators for switching units
US3295091A (en) * 1964-11-26 1966-12-27 Mossin Oskar Von Liquid contact arrangement between relatively rotatable conductors
US3444408A (en) * 1967-08-25 1969-05-13 Gen Electric Liquid metal electrical collector
US3573521A (en) * 1970-03-05 1971-04-06 Gen Electric Conductor blade for a liquid metal collector
US3604967A (en) * 1970-04-10 1971-09-14 Gen Electric Liquid metal collector velocity divider

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5696526A (en) * 1983-04-19 1997-12-09 Canon Kabushiki Kaisha Method of driving optical modulation device
US4733038A (en) * 1985-11-22 1988-03-22 Charmilles Technologies S.A. Contact member for supplying electrical current to an electro-erosion wire electrode
US20030129855A1 (en) * 2001-12-21 2003-07-10 Douglas Richard E. Current collector assembly and method
US20170244209A1 (en) * 2016-02-23 2017-08-24 Sikorsky Aircraft Corporation Rotor system slip ring assemblies
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
US20190157947A1 (en) * 2016-09-06 2019-05-23 Bayerische Motoren Werke Aktiengesellschaft Drive Device for a Motor Vehicle
US10840779B2 (en) * 2016-09-06 2020-11-17 Bayerische Motoren Werke Aktiengesellschaft Drive device for a motor vehicle
US20220255277A1 (en) * 2019-07-02 2022-08-11 Ford Global Technologies, Llc Current transferring device for an electric machine and an electric machine with the same, and a vehicle
US11916343B2 (en) * 2019-07-02 2024-02-27 Ford Global Technologies, Llc Current transferring device for an electric machine and an electric machine with the same, and a vehicle

Also Published As

Publication number Publication date
AT315956B (de) 1974-06-25
DE2325398A1 (de) 1973-12-06
CH555095A (de) 1974-10-15
JPS4950404A (xx) 1974-05-16
FR2185871A1 (xx) 1974-01-04
GB1433143A (en) 1976-04-22
CA988594A (en) 1976-05-04
FR2185871B1 (xx) 1977-07-29

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