US3628051A - Contact brush unit for an electrical machine, particularly for a slip-ring electrical machine - Google Patents

Contact brush unit for an electrical machine, particularly for a slip-ring electrical machine Download PDF

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Publication number
US3628051A
US3628051A US10727A US3628051DA US3628051A US 3628051 A US3628051 A US 3628051A US 10727 A US10727 A US 10727A US 3628051D A US3628051D A US 3628051DA US 3628051 A US3628051 A US 3628051A
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US
United States
Prior art keywords
brush
sleeve
current supply
holder
supply bar
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
US10727A
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English (en)
Inventor
Alexandr Abramovic Chigirinshy
Evgeny Khaimovich Glider
Oleg Borisovich Gradov
David Bentsionovich Kapnman
Boris Leonidovich Konovalov
Boris Bolkovich Spivak
Vasily Semenovich Kildishev
Ivan Eliseevich Makogonenko
Ivan Terentievich Filipenko
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Individual
Original Assignee
Individual
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
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Application granted granted Critical
Publication of US3628051A publication Critical patent/US3628051A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R39/38—Brush holders
    • H01R39/41—Brush holders cartridge type

Definitions

  • a contact brush unit comprises a device for replacement of a worn-out brush without stopping the operation of the machine.
  • the device includes a sleeve, mounted around a brush holder and secured at one end to a current supply bar of the machine so that the portion of the brush holder, received inside the current supply bar, is pressed by the sleeve against this bar.
  • the unit also includes a means for raising the brush selectively off the rotor contact member, e.g.
  • a slip ring such means being spring-mounted on the stem and freely passing through the other, opposite end of the sleeve, the last-mentioned end of the sleeve having an edge portion adapted to retain thereon the brush-raising means in an abutted position, when the brush is to be replaced, whereby thesleeve and the brush holder can be jointly removed from the current supply bar during operation of the machine.
  • the present invention relates to electrical machines and, more particularly, it relates to contact brush units for electrical machines, preferably, slipring machines, and it can be employed, for example, in high-power turbine-generator sets.
  • Contact brush assemblies are known which provide for replacement of a wornout brush with sufficient safety and without the use of any additional protection means during operation of an electrical machine.
  • contact brush units for an electrical machine including a brush-having connected thereto a stem and a pressure member, a brush holder mounted on a current supply bar of the machine and an insulating means in the form of a lever, providing for replacement of a wornout brush without stopping the machine.
  • this known structure is of a relatively great size, whereby its application involves either increasing the diameter of the associated slipring, or else reducing the number of the contact brushes arranged about the ring.
  • this known contact brush unit does not give any indication of the degree to which the brush has worn in operation. The contact brush holder is removed without the brush having been raised off the slipring beforehand, which might lead to undesired generation of sparks, as the holder is raised and removed.
  • the brush replacement operation is not convenient enough, since when the lever is pressed down, the entire brush holder has to be held by the operator in his hands, which might lead to either the brush holder or the edge of the brush accidentally touching the rotating slipring.
  • a device is also known for incorporation in a contact brush unit, which provides for raising the brush and retaining it in the raised position, as the brush is being replaced. HOwever, this device is also bulky and does not ensure adequate safety and swiftness of the brush replacement operation.
  • the main object of the present invention is to provide a contact brush unit for an electrical machine, e.g. for a turbinegenerator set, which will provide for facilitated replacement of a worn-out brush, for adequately safe operation of removing the contact brush unit from the current supply bar, with the brush having been raised off the contact means of the rotor beforehand and retained with this raised position, for positive retaining of the brush-raising means in respect to the brush holder, as well as for indicating the degree to which the brush has worn out in operation.
  • an electrical machine e.g. for a turbinegenerator set
  • a contact brush unit for an electrical machine particularly, for a slipring electrical machine, comprising a brush connected to a stem, this stem receiving thereabout a compression spring adapted to effect engagement between the brush and the contact means of the rotor of the machine; means cooperating with the stem and adapted to effect selective raising of the brush and retaining the brush in a raised position, a brush holder adapted to be secured to a current supply bar of the machine, insulating means for replacement of the brush in operation of the machine, in which contact brush unit, in accordance with the present invention, said means for replacement of said brush includes a hollow sleeve mounted at least partly about said brush holder and adapted to be secured by its first end to said current supply bar, so that a portion of said brush holder, received inside said current supply bar, is pressed by said sleeve against said current supply bar, whereas said means for selective raising of said brush is spring-mounted on said stem and passes freely through the second end of said sleeve, opposing said first end,
  • said brush holder prefferably be provided with a stop member against which said brush-raising means is adapted to abut in a retained position, and for a resilient member to be interposed between the portion of said'brush holder, received inside said current supply bar, and said sleeve, the latter pressing upon said brush holder through said resilient ember.
  • a contact brush unit constructed in accordance with the present invention, has been found to attain the aforementioned aims and objects, and, besides, to feature a simplicity of structure, a relatively small size and a dependable performance.
  • FIG. 1 is a longitudinally sectional view of a contact brush unit in accordance with the present invention
  • FIG. 2 is a top plan view of the contact brush unit, in FIG. 1;
  • FIG. 3 shows schematically the same contact brush unit, as shown in FIG. 1, in which the brush-raising means is in its operating position, and the brush is unworn;
  • FIG. 4 shown s schematically the same contact brush unit, but with the brush worn to a full permissible extent
  • FIG. 5 shows schematically the same brush unit, in which the brush-raising means is in its raised position and is retained against the upper end edge of the sleeve;
  • FIG. 6 shows schematically the same contact brush unit, removed bodily from the current supply bar.
  • the contact brush unit embodying the present invention, comprises a brush holder structure I the lower portion of which is a hollow housing 2, rectangular in cross section and having an external cylindrical flange 3.
  • the housing 2 has an internal opening receiving thereinside a contact brush 4.
  • a resilient shock-damping washer 5 is mounted on top of the brush 4, and an elongated step 6 is connected to the brush 4 and bears on the washer 5 from above.
  • the brush holder structure 1 supports a device enabling replacement of the brush in operation of the motor, the device including a hollow sleeve 10 made of an electrically insulating material.
  • a threaded bottom end portion of the sleeve 10 is screwed into a threaded opening of a current supply bar I I and presses the housing 2 of the brush holder structure 1 against an internal shoulder in the bar 11, the pressure being transmitted via a resilient annular member 12.
  • Passing freely through the top end of the hollow sleeve is a member 13 for selectively raising the brush 4 and retaining the same in a raised position, the cross-sectional shape of the member 13 corresponding to the internal cross-sectional shape of the opening in the sleeve 10, through which opening the member 13 extends (see FIG. 2).
  • the member 13 is also made of an electrically insulating material, and a compression spring 14 (which is substantially weaker than the spring 8) holds the member 13 against the stop member 7, the spring 14 being received about the stem 6 and compressed in operation between the bottom flange of the member 13 and an indicating element 15 mounted on the end portion of the stem 6, opposite to the end portion thereof connected to the brush 4.
  • a flexible metal conductor 16 providing positive electric connection between the brush 4 and the brush holder 1. Ventilation ports 17 are provided in the sleeve 10.
  • the housing 2 of the brush holder structure 1 has a groove 18 therein, the groove 18 defining a desired setting of the brush 4 relative to the supply bar ll in an assembled state of the contact brush assembly.
  • the element 15 is raised well above the upper extremity of the brush-raising member 13. As the brush 4 wears in the course of operation of the associated electrical machine, the stem 6 together with the brush 4 and the indicating element 15 gradually lower, as shown in FIG. 4; when the brush 4 becomes worn beyond a permissible extent, the indicating element 15 abuts against the bottom of the member 13 and thus prevents any further lowering of the stem 6 with the brush 4.
  • the position of the indicating element 15 is clearly indicative of the degree to which the brush 4 is worn.
  • the brush raising member 13 is raised manually, until it clears the sleeve 10, whereafter it is rotated about the stem 6 through a corresponding angle and released to abut against the top edge 19 of the sleeve 10 under the compression force of the spring 8.
  • the brush 4 is retained in its raised position, and the sleeve 10 may be now unscrewed manually from the current supply bar 11, whereafter the contact brush assembly can be removed as a body, as is shown in FIG. 6.
  • the contact brush assembly may be put back and secured to the current supply bar, the procedure being the reverse of the one described.
  • a contact brush unit for an electrical machine particularly, for a slipring electrical machine, comprising: a brush; a stem having first and second ends, said first end being connected with said brush; spring means pressing said brush against contact means of the rotor of said electrical machine; a brush holder supporting said brush; a current supply bar engageable with said brush holder by receiving a portion of said holder therein; means for effecting replacement of said brush during operation of said machine including a sleeve made of an electrically insulating material mounted at least partly about said brush holder, said sleeve having a first end portion detachably connected to said current suplply bar with adjustment so that said portion of said brush ho der recelved m said current supply bar is pressed against said current supply by connection of the sleeve to said bar; and means for selective raising of said brush from the contact means of said rotor, the brush-raising means being made of an electrically insulating material and being spring-mounted on said stem, said sleeve having a
  • a brush unit as claimed in claim 1 wherein said brush holder has an end opposite said brush witha stop member thereat against which said brush-raising means abuts and it supported in the operative state of said contact brush unit, whereby to prevent accidental loosening of said sleeve with respect to said brush holder, a resilient means acting between said portion of said brush holder received in said supply bar and said sleeve to provide electrical contact between said current supply bar and said brush holder when said brush-raising means is retained in the operating position thereof.
  • a brush unit as claimed in claim 2 wherein said resilient means comprises an annular member encircling said brush holder.
  • a brush unit as claimed in claim 1 comprising an element on said stem which lowers together with said stem as said brush wears in operation, said element abutting against said brush-raising means when said brush is worn to a limited extend to prevent any further lowering of said brush.
  • a brush unit as claimed in claim 5 wherein said current supply bar is threaded to said sleeve, said brush holder including an external ring engageable by said current supply bar.

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  • Motor Or Generator Current Collectors (AREA)
US10727A 1970-02-04 1970-02-12 Contact brush unit for an electrical machine, particularly for a slip-ring electrical machine Expired - Lifetime US3628051A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19702004910 DE2004910A1 (de) 1970-02-04 1970-02-04 Bursteneinheit fur elektrische Ma schinen, vorzugsweise für Maschinen mit Schleifringen
US1072770A 1970-02-12 1970-02-12
GB811070 1970-02-19
FR7006386A FR2080078A5 (cs) 1970-02-04 1970-02-23

Publications (1)

Publication Number Publication Date
US3628051A true US3628051A (en) 1971-12-14

Family

ID=27431016

Family Applications (1)

Application Number Title Priority Date Filing Date
US10727A Expired - Lifetime US3628051A (en) 1970-02-04 1970-02-12 Contact brush unit for an electrical machine, particularly for a slip-ring electrical machine

Country Status (4)

Country Link
US (1) US3628051A (cs)
DE (1) DE2004910A1 (cs)
FR (1) FR2080078A5 (cs)
GB (1) GB1305604A (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849684A (en) * 1973-02-21 1974-11-19 Singer Co Assembly of externally accessible brushes
US3864803A (en) * 1974-02-14 1975-02-11 Gen Electric Cartridge brush holder
DE2850170A1 (de) * 1977-11-21 1979-05-23 Gen Electric Buerstenhalterung fuer dynamoelektrische maschine
EP0806818A3 (de) * 1996-05-10 1998-12-09 SCHUNK Motorensysteme GmbH Bürstenhalterung
US20100141083A1 (en) * 2005-10-13 2010-06-10 Cutsforth Products Inc. Resilient member for a brush holder assembly
US8446062B2 (en) 2011-08-08 2013-05-21 Wabtec Holding Corp. Brush holder assemblies

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE310777C (cs) *
FR485841A (fr) * 1917-06-16 1918-02-08 Henri De La Valette Borne-frotteur pour distributeurs de courants à haute tension
US2537714A (en) * 1950-03-10 1951-01-09 Lamb Electric Company Brush holder and method of assembling same into electric motors
US2986666A (en) * 1959-05-18 1961-05-30 Tsutsumi Kentaro Brush assembly units
US3005078A (en) * 1958-09-18 1961-10-17 Genevoise Instr Physique Electrical contact device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE310777C (cs) *
FR485841A (fr) * 1917-06-16 1918-02-08 Henri De La Valette Borne-frotteur pour distributeurs de courants à haute tension
US2537714A (en) * 1950-03-10 1951-01-09 Lamb Electric Company Brush holder and method of assembling same into electric motors
US3005078A (en) * 1958-09-18 1961-10-17 Genevoise Instr Physique Electrical contact device
US2986666A (en) * 1959-05-18 1961-05-30 Tsutsumi Kentaro Brush assembly units

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3849684A (en) * 1973-02-21 1974-11-19 Singer Co Assembly of externally accessible brushes
US3864803A (en) * 1974-02-14 1975-02-11 Gen Electric Cartridge brush holder
DE2850170A1 (de) * 1977-11-21 1979-05-23 Gen Electric Buerstenhalterung fuer dynamoelektrische maschine
EP0806818A3 (de) * 1996-05-10 1998-12-09 SCHUNK Motorensysteme GmbH Bürstenhalterung
US20100141083A1 (en) * 2005-10-13 2010-06-10 Cutsforth Products Inc. Resilient member for a brush holder assembly
US7816834B2 (en) * 2005-10-13 2010-10-19 Cutsforth Products, Inc. Resilient member for a brush holder assembly
US20110006635A1 (en) * 2005-10-13 2011-01-13 Cutsforth Products Inc. Resilient member for a brush holder assembly
US7960892B2 (en) * 2005-10-13 2011-06-14 Cutsforth Products, Inc. Resilient member for a brush holder assembly
US8446062B2 (en) 2011-08-08 2013-05-21 Wabtec Holding Corp. Brush holder assemblies

Also Published As

Publication number Publication date
DE2004910A1 (de) 1971-08-19
GB1305604A (cs) 1973-02-07
FR2080078A5 (cs) 1971-11-12

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