EP0089725B1 - Appareil rotatif pour le transfert d'énergie électrique - Google Patents

Appareil rotatif pour le transfert d'énergie électrique Download PDF

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Publication number
EP0089725B1
EP0089725B1 EP19830200377 EP83200377A EP0089725B1 EP 0089725 B1 EP0089725 B1 EP 0089725B1 EP 19830200377 EP19830200377 EP 19830200377 EP 83200377 A EP83200377 A EP 83200377A EP 0089725 B1 EP0089725 B1 EP 0089725B1
Authority
EP
European Patent Office
Prior art keywords
contact
rotary device
contact element
bearing
fluid
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
Application number
EP19830200377
Other languages
German (de)
English (en)
Other versions
EP0089725A1 (fr
Inventor
Godefridus Adrianus Maria Hurkx
Everhardus Albertus Muijderman
Antonius Gerardus Tangena
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0089725A1 publication Critical patent/EP0089725A1/fr
Application granted granted Critical
Publication of EP0089725B1 publication Critical patent/EP0089725B1/fr
Expired 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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/30—Liquid contacts

Definitions

  • the invention relates to a rotary device for the transfer of electric power, which device comprises a cylindrical rotatable contact unit of which the circumference is provided with a plurality of first contact elements being discrete sections which are insulated from each other by an insulating layer, and a second contact element, situated adjacent the said circumference, the contact unit being movable relative to the second contact element for the transfer of power between said second contact element and respective first contact elements.
  • a rotary device for the transfer of electric power which device comprises a cylindrical rotatable contact unit of which the circumference is provided with a plurality of first contact elements being discrete sections which are insulated from each other by an insulating layer, and a second contact element, situated adjacent the said circumference, the contact unit being movable relative to the second contact element for the transfer of power between said second contact element and respective first contact elements.
  • the UK Patent Application GB-A-2019107A shows an electric motor having a commutator with commutator pieces, which operates with brushes.
  • a conductive layer is coated on the commutator surface to reduce the sliding friction of the brushes.
  • the brushes are fork-shaped for cutting the conductive layer so that there is a direct physical contact between the commutator pieces and the brushes.
  • the main disadvantage of this known device is the direct physical contact between the commutator and the brushes, and consequent a limited lifetime as a result of sliding friction.
  • the invention aims to diminish the sliding friction in the rotary device for transfer of electric power and is characterized in that a ring-shaped member is disposed around the circumference of the cylindrical contact unit, and has electrically insulating material at least on the inner periphery thereof in which periphery the second contact element is disposed, and the ring-shaped member defines a space between the contact unit and the second contact element, in which space an electrically conductive fluid is present, which fluid connects electrically the first and second contact elements.
  • the British Patent Specification GB-A-621 108 shows an electric machine with a rotatable commutator which cooperates with brushes.
  • this device has the disadvantage that there is not defined a space around the commutator by a ring-shaped member.
  • a particular embodiment of the present invention is characterized in that the thickness of the insulating layer is greater than the thickness of the film of the electrically conductive fluid present in the said space.
  • the contact unit and the second contact element may form part of a bearing, in particular a spiral-groove bearing.
  • the electric motor shown in Fig. 1 comprises a housing 1, stators 2 and 3 of a permanent- magnetic material, and a rotor 4 on the shaft 5.
  • the shaft also carries a contact unit 6 constructed as a collector.
  • the collector comprises first contact elements 7, 8 and 9 (Fig. 2) in the form of segments of an electrically conductive material, which segments are separated by layers 10 of an insulating material.
  • the contact elements 7, 8 and 9 are connected to the coils 11 of the rotor.
  • Second contact elements 13 and 14 are arranged in the ring 12 at two diametrically opposite locations. These contact elements 13, 14 can be connected to a voltage source via connecting lugs 15.
  • a cylindrical film 16 of an electrically conductive fluid is present between the contact unit 6 and the ring 12.
  • the contact unit 6 comprising the first contact elements 7, 8 and 9 and the ring 12 provided with the second contact elements 13 and 14 form a' device for transferring electric power during rotation of the rotor relative to the housing 1.
  • the electric current from the voltage source will flow through the contact element 13, the conductive fluid film 16, and the contact element 9 to a rotor coil 11 and will return to the voltage source via the contact element 8, the fluid film 16 and the contact element 14.
  • the resistance values of the rotor coils lie in the range 1­10 ⁇ so that, in view of the value of the leakage resistance R 2 relative to the value of the rotor-coil resistance and the resistance R 1' the loss of power as a result of the direct electric current through the fluid film at the location 18 between the contact elements 8 and 9 may be ignored.
  • the power-transfer device is constructed as a bearing comprising a shaft 19 and a bearing bush 20, the electrically conductive fluid also serving as a lubricant.
  • the bearing is constructed as a spiral-groove bearing, because as a result of the self- centring properties of such a bearing a very small clearance between the shaft and the bearing bush, corresponding to a very small thickness d of the fluid film, may be used, whilst as a result of the pumping action of the spiral-groove bearing it is achieved in a simple manner that an electrically conductive fluid is always present at the location of the contact elements and over the entire circumference of the shaft.
  • first contact elements 21, 22 and 23 are arranged, which elements are insulated from each other and from the shaft by an insulating layer 24.
  • the shaft 19 is rotatably journalled in the bearing bush 20 which is provided with second contact elements 25 (Figs. 5 and 6).
  • the bearing bush is formed with V-shaped grooves 26, so that a spiral-groove bearing is formed.
  • an electrically conductive fluid 27 is present for the transfer of electric power between the first and second contact elements, in the same way as in the embodiment shown in Figures 1 and 2.
  • a second bearing bush 28 is arranged adjacent the bearing bush 20, which second bush is also constructed as a spiral-groove bearing having grooves 29.
  • the portion of the bearing bush 28 adjacent the bearing bush 20 has an annular chamber 30 provided with an inlet duct 31.
  • a lubricant which also serves as an electrically conductive fluid, can be fed to the bearing bushes 20 and 28 via this duct 31 and the chamber 30.
  • fluid will be fed to the central zones 32 and 33 of the bearing bushes 20 and 28 respectively, whilst leakage of fluid from the bearing is minimized.
  • the zone 32 where the second contact elements 25 are located always receives an adequate amount of electrically conductive fluid.
  • mercury as the electrically conductive fluid.
  • a mixture of conductive particfes ⁇ and a non-conductive fluid, for example silver particles and ethyleneglycol can be used.

Landscapes

  • Motor Or Generator Frames (AREA)
  • Electromechanical Clocks (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Sliding-Contact Bearings (AREA)

Claims (5)

1. Dispositif rotatif pour le transfert d'énergie électrique, comportant une unité rotative cylindrique de contact (6) dont le pourtour est muni d'une pluralité de premiers éléments de contact (7, 8, 9; 21, 22, 23) constitués par des parties discrètes séparées les unes des autres par une couche isolante (10), et un second élément de contact (13, 14; 25) situé à proximité dudit pourtour, l'unité de contact étant mobile par rapport au second élément de contact pour le transfert d'énergie entre ledit second élément de contact et de premiers éléments de contact respectifs, caractérisé en ce que,
- un organe annulaire 12 est disposé autour du pourtour de l'unité cylindrique de contact (6) et est muni, au moins suivant sa périphérie intérieure d'un matériau électriquement isolant, périphérie à laquelle est disposé le second élément de contact-(-13, 14; 25) et
- l'organe annulaire définit un espace entre l'unité de contact et le second élément de contact, espace dans lequel est présent un fluide conducteur de l'électricité reliant les premiers éléments de contact (7, 8, 9; 21, 22, 23) électriquement au second élément de contact (13, 14; 25).
2. Dispositif rotatif selon la revendication 1, caractérisé en ce que l'épaisseur (s) de la couche isolante (10) est supérieure à l'épaisseur (d) du film (16) du fluide conducteur de l'électricité présent dans ledit espace.
3. Dispositif rotatif selon la revendication 1, caractérisé en ce que l'unité de contact et le second élément de contact (25) font partie d'un palier.
4. Dispositif rotatif selon la revendication 3, caractérisé en ce que le palier est du type à rainure hélicoïdale.
5. Dispositif rotatif selon l'une quelconque des revendications précédentes, caractérisé en ce que le fluide conducteur de l'électricité est un mélange de particules conductrices et d'un fluide non conducteur.
EP19830200377 1982-03-22 1983-03-21 Appareil rotatif pour le transfert d'énergie électrique Expired EP0089725B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8201166A NL8201166A (nl) 1982-03-22 1982-03-22 Inrichting voor overdracht van elektrische energie.
NL8201166 1982-03-22

Publications (2)

Publication Number Publication Date
EP0089725A1 EP0089725A1 (fr) 1983-09-28
EP0089725B1 true EP0089725B1 (fr) 1986-07-30

Family

ID=19839447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830200377 Expired EP0089725B1 (fr) 1982-03-22 1983-03-21 Appareil rotatif pour le transfert d'énergie électrique

Country Status (4)

Country Link
EP (1) EP0089725B1 (fr)
JP (1) JPS58172882A (fr)
DE (1) DE3364844D1 (fr)
NL (1) NL8201166A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2012886B1 (en) 2014-05-26 2016-06-08 Imc Corp Licensing B V Method and device for reducing the resistance between two conductors.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB621108A (en) * 1942-06-03 1949-04-05 Lorraine Carbone Improvements in sliding contacts for electric machines
GB777335A (en) * 1954-01-26 1957-06-19 Ass Elect Ind Improvements relating to electrical connectors between relatively rotating parts
US3523079A (en) * 1963-11-04 1970-08-04 Westinghouse Electric Corp Electrically conductive solid lubricant members and process and apparatus employing them
JPS54137606A (en) * 1978-04-18 1979-10-25 Mabuchi Motor Co Small motor

Also Published As

Publication number Publication date
JPS58172882A (ja) 1983-10-11
NL8201166A (nl) 1983-10-17
DE3364844D1 (en) 1986-09-04
EP0089725A1 (fr) 1983-09-28

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