EP0072693B1 - Elektrische Bürsten - Google Patents

Elektrische Bürsten Download PDF

Info

Publication number
EP0072693B1
EP0072693B1 EP19820304314 EP82304314A EP0072693B1 EP 0072693 B1 EP0072693 B1 EP 0072693B1 EP 19820304314 EP19820304314 EP 19820304314 EP 82304314 A EP82304314 A EP 82304314A EP 0072693 B1 EP0072693 B1 EP 0072693B1
Authority
EP
European Patent Office
Prior art keywords
brush
transverse hole
sensor
loop
brush body
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
EP19820304314
Other languages
English (en)
French (fr)
Other versions
EP0072693A3 (en
EP0072693A2 (de
Inventor
Royston Amos Cheesmore
Rees Morgan
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.)
Morganite Electrical Carbon Ltd
Original Assignee
Morganite Electrical Carbon Ltd
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 Morganite Electrical Carbon Ltd filed Critical Morganite Electrical Carbon Ltd
Publication of EP0072693A2 publication Critical patent/EP0072693A2/de
Publication of EP0072693A3 publication Critical patent/EP0072693A3/en
Application granted granted Critical
Publication of EP0072693B1 publication Critical patent/EP0072693B1/de
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
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear

Definitions

  • This invention relates to an electrical brush having a brush wear sensor in the form of a loop of insulated electrical conductor within the brush body and also relates to a method of anchoring a brush wear sensor in an electrical brush body.
  • United States Patent Specification No. 3153164 discloses a method of anchoring a flexible conductor in an electrical brush body. The specific method being the use of a button 21 to secure a loop 17 of a shunt or pigtail 16 in a recess 13, the shunt or pigtail loop being passed down a single passage 15 (see column 2 lines 17 to 28 of the specification).
  • a wear sensor lead has to be insulated from the conductive brush body.
  • difficulty is experienced in anchoring the necessary high temperature insulators which are based on materials such as polymers of fluoroethylene. These high temperature insulators have a smooth, generally inert surface that cannot be simply bonded in the brush body to anchor the sensor.
  • an electrical brush has a brush wear sensor in the form of a loop of insulated electrical conductor provided in a bore in the brush body leading from an upper surface thereof to a depth equivalent to the point at which brush wear is to be sensed, whereby a pair of fine bores lead from the brush upper surface to meet a transverse hole in a side face of said brush body at said wear depth, and a respective arm of said wear sensor loop lies in a respective one of said fine bores with the inner end of said sensor looping from one of said fine bores to the other of said fine bores via said transverse hole.
  • the transverse hole may be filled with an epoxy resin cement or the like.
  • the invention is also directed to a method of anchoring a brush wear sensor in an electrical brush comprising the steps of:-
  • a brush wear sensor is formed by the loop that is anchored in the brush body by virtue of its looping from one fine bore to the other via the transverse hole.
  • a brush 1 has a pair of silastomer sleeved flexible current shunts 2 and 3 located by tamped copper powder connections in the top 4 of the brush.
  • Two fine bores 5 and 6 are drilled from the brush top 4, close to the side 7, and angled towards one another to converge at a short hole 8 drilled transversely from the side 7.
  • Transverse hole 8 is drilled at a depth dfrom the brush top 4 at which it is desired to sense brush wear.
  • a brush wear sensor 9 in the form of a lead or conductor insulated with TEFLON (Trade Mark) is made into a loop of which the two arms 10 and 11 are each fed into one of the bores 5 and 6 via the transverse hole 8.
  • the sensor arms are twisted together above the brush and the free ends are connected to a terminal 12.
  • This construction has the advantage of ease of assembly as the lead ends are simple to insert through the transverse hole 8 into the bores 5 and 6.
  • the wear depth d can be set accurately, as it is a combination of the siting of hole 8 and the protrusion into the hole of the loop end 13.
  • the hole 8 is filled with ARALDITE (Trade Mark) to bond the loop end 13 in the hole 8, to seal the hole and to help to retain the loop and the ends thereof formed as the brush wears past the hole 8.
  • ARALDITE Trade Mark
  • the sensor lead 9 is used in known manner to detect wear by current leakage.

Landscapes

  • Motor Or Generator Current Collectors (AREA)

Claims (6)

1. Elektrische Bürste mit einem Bürstenverschleisssensor in Form einer Schlaufe eines isolierten elektrischen Leiters, welcher in einer Bohrung im Bürstenkörper vorgesehen ist und von seiner oberen Fläche zu einer Tiefe (d) führt, die dem Punkt entspricht, in welchem der Bürstenverschleiss zu erfassen ist, dadurch gekennzeichnet, dass ein Paar enger Bohrungen (5, 6) von der oberen Fläche (4) der Bürste zu einem Querloch (8) in einer Seitenfläche (7) des Bürstenkörpers (1) in der Tiefe (d) führt und dass je ein Arm der Sensorschlaufe (10, 11) in einer der engen Bohrungen liegt, wobei das innere Ende (13) des Sensors (9) eine über das Querloch von einer zu der anderen der engen Bohrungen führende Schlaufe bildet.
2. Elektrische Bürste nach Anspruch 1, dadurch gekennzeichnet, dass das innere Ende (13) des Sensors im Querloch (8) fixiert und abgedichtet ist.
3. Elektrische Bürste nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die engen Bohrungen (5, 6) nahe einer Seitenfläche (7) des Bürstenkörpers (1) angeordnet sind, dass das Querloch (8) ein kurzes Loch in der Seitenwand ist und dass die engen Bohrungen zueinander in einem Winkel angeordnet sind, so dass die an dem kurzen Querloch zusammenlaufen.
4. Verfahren zum Verankern eines Bürstenverschleisssensors in einem elektrischen Bürstenkörper, dadurch gekennzeichnet, dass
(i) ein Querloch (8) in einer Seitenfläche (7) des Bürstenkörpers (1) in einer Tiefe (d) ausgebildet wird, welche dem Punkt entspricht, an welchem ein Bürstenverschleiss zu erfassen ist, dass
(ii) in einer oberen Fläche (4) des Bürstenkörpers gebohrt wird, um ein Paar enger Bohrungen (5, 6) auszubilden, die auf das Querloch treffen, und dass
(iii) die freien Enden (10, 11) der Arme einer Schlaufe eines isolierten elektrischen Leiters in das Querloch eingesetzt werden und die beiden freien Enden durch je eine der engen Bohrungen geführt werden, so dass ein Bürstenverschleisssensor (9) durch die Schlaufe (11) gebildet wird, welche im Bürstenkörper aufgrund ihres Verlaufes von einer engen Bohrung zur anderen über das Querloch verankert ist.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass
(i) die Sensorschlaufenarme (10, 11) oberhalb der oberen Fläche (4) des Bürstenkörpers zusammengedreht werden und dass
(ii) die freien Enden der Sensorschlaufe mit einem Anschluss (12) verbunden werden.
6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das Querloch (8) mit einem Klebstoff gefüllt wird, um die Sensorschlaufe (13) darin zu verkleben und das Loch abzudichten.
EP19820304314 1981-08-14 1982-08-16 Elektrische Bürsten Expired EP0072693B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8124882 1981-08-14
GB8124882 1981-08-14

Publications (3)

Publication Number Publication Date
EP0072693A2 EP0072693A2 (de) 1983-02-23
EP0072693A3 EP0072693A3 (en) 1983-03-09
EP0072693B1 true EP0072693B1 (de) 1986-02-05

Family

ID=10523944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820304314 Expired EP0072693B1 (de) 1981-08-14 1982-08-16 Elektrische Bürsten

Country Status (2)

Country Link
EP (1) EP0072693B1 (de)
DE (1) DE3268958D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA836244B (en) * 1982-08-30 1984-06-27 Gen Electric Articulated brush wear indicator in combination with a carbon brush and method for making such apparatus
US5870026A (en) * 1997-07-15 1999-02-09 The Morgan Crucible Company Plc Brush wear indicator
DE19755232B4 (de) * 1997-12-12 2008-12-24 Continental Automotive Gmbh Kraftstoffpumpe
DE10026176A1 (de) * 2000-05-26 2002-01-10 Schleifring Und Appbau Gmbh Halte- und Kontaktierungsvorrichtung für Schleifkontakte; Leiterplatten-Bürstenblock

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB795998A (en) * 1955-06-29 1958-06-04 Erich Mittelsten Scheid Improvements in or relating to carbon brushes
US3153164A (en) * 1961-05-15 1964-10-13 Kirkwood Carbon Corp Commutator brush and connection
DK108400C (da) * 1966-10-18 1967-12-04 Cello Pak As Kulbørste og anlæg med en sådan.
US4316186A (en) * 1980-02-06 1982-02-16 Eltra Corporation Brush wear detection and warning system

Also Published As

Publication number Publication date
EP0072693A3 (en) 1983-03-09
EP0072693A2 (de) 1983-02-23
DE3268958D1 (en) 1986-03-20

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