EP2571115A1 - Modularer Bürstenhalter - Google Patents

Modularer Bürstenhalter Download PDF

Info

Publication number
EP2571115A1
EP2571115A1 EP11181549A EP11181549A EP2571115A1 EP 2571115 A1 EP2571115 A1 EP 2571115A1 EP 11181549 A EP11181549 A EP 11181549A EP 11181549 A EP11181549 A EP 11181549A EP 2571115 A1 EP2571115 A1 EP 2571115A1
Authority
EP
European Patent Office
Prior art keywords
brush
contact
brush holder
insert
spring element
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.)
Granted
Application number
EP11181549A
Other languages
English (en)
French (fr)
Other versions
EP2571115B1 (de
Inventor
Andreas Wirtz
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.)
Schleifring GmbH
Original Assignee
Schleifring und Apparatebau GmbH
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 Schleifring und Apparatebau GmbH filed Critical Schleifring und Apparatebau GmbH
Priority to EP11181549.4A priority Critical patent/EP2571115B1/de
Publication of EP2571115A1 publication Critical patent/EP2571115A1/de
Application granted granted Critical
Publication of EP2571115B1 publication Critical patent/EP2571115B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01R39/38—Brush holders
    • H01R39/385—Means for mechanical fixation of the brush holder
    • 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
    • H01R39/40—Brush holders enabling brush movement within holder during current collection
    • 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
    • H01R39/381—Brush holders characterised by the application of pressure to brush

Definitions

  • the invention relates to a brush holder for holding brushes in an electrical power transfer device like a slipring or rotary joint.
  • Sliprings are used to transfer electrical power between rotating parts of machines like wind power plants, CT scanners or electrical generators.
  • a brush mainly comprising of electrically conductive material like carbon is sliding on a rotating cylindrical track of conductive material. Common materials for such tracks are steel or brass.
  • Slipring brushes must have a low contact resistance to the track during a long lifetime. Furthermore they must have low contact noise. Specifically when used in CT scanners, the rotating speed of the track is comparatively high and may be in a range up to 20 m/s. To avoid contact interruptions the brush must quickly follow dynamic changes of the track height.
  • US patent 5,220,588 discloses a low inertia brush block assembly with comparatively light weight brush holders made of molded plastic material.
  • the European patent application EP 0 358 812 discloses a metal brush holder having an inner isolated sidewalls.
  • German patent application DE 10 2009 034 884 A1 discloses a brush holder having a spring asserting a force lateral to the longitudinal axis of a brush.
  • the problem to be solved by the invention is to provide a brush holder with improved dynamic characteristics and lifetime.
  • a further object of the invention is to provide a brush holder with reduced manufacturing costs.
  • the brush holder comprises of two basic components.
  • the first basic component is the insert which comprises of electrically and thermally conductive metal. Preferably the insert is punched from a metal sheet and bent to its final form. Due to its simplicity this can be done within a few manufacturing process steps.
  • the second basic component is an isolated housing which preferably comprises of some resin or plastic material.
  • the housing provides mechanical stability and electrical isolation to the insert. It is preferably manufactured by injection molding.
  • the isolated housing provides at least one hole, preferably a plurality of holes for holding inserts. According to the required number of brushes, inserts may be inserted into the holes of the housing. This allows for a modular brush block concept. For example for achieving a high isolation for high voltage between neighbored brushes, one or a plurality of holes between these neighbored brushes may be left empty.
  • the brush holder prevents sticking of brushes due to debris particles between the brush and the brush holder. Even under normal operating conditions there is some wear of the brush. Smaller particles may break off the brush. Such particles or dust may come into the gap between the brush sidewalls and the brush holder. In most cases these particles are grinded by the movement of the brush against the brush holder. If the particles are big enough or dust has accumulated to some minimum size, the particles may prevent movement of the brush by generating frictional resistance which cannot be overcome by the spring. This results in sticking of the brush. Such as sticking brush can no more follow the tracks movement and therefore cannot conduct any current. It must be repaired manually.
  • the brush holder insert has grooves of the surfaces contacting the sides of the brush, which allow debris and dust particles to be removed during movement of the brush against the brush holder insert.
  • the inventive brush holder allows easy checking of the brush wear. Through the slot in the brush holder insert the remaining length of the brush can easily be seen. There may also be a photo sensor to measure the remaining brush length or to identify a worn brush. Such a photo sensor may be integrated into the housing of the brush rock. Alternatively the housing may also have slot for viewing the brush from the outside.
  • the insert provides a spring element having a length being larger than the partial length of the contact brush within the insert.
  • this spring element asserts a force parallel to the longitudinal axis of the brush.
  • the longitudinal axis is defined through the center and along the length of the brush.
  • the spring element may guide the part of the brush within the insert.
  • the spring element may assert a slight force to the carbon brush to provide for precise guiding within the insert. This prevents from unwanted movements of the brush within the brush holder during movement of the sliding track and therefore reduces contact noise.
  • the spring element ensures plane contact of one side of the brush with second sidewall.
  • the spring element was designed to press at least one side surface of the brush against one side wall of the brush holder.
  • this sidewall is oriented at a right angle to the direction of movement between the brush and the sliding track, thus allowing the plane contact even when the brush tilts within the brush holder.
  • a brush holder 10 comprises of a housing 11 and an insert 20 therein.
  • the housing is made of some insulating material, like plastic or resin. It isolates and stabilizes the insert.
  • the insert is made of metal providing electrical and thermal conductivity. It holds a brush 31 which is preferably a carbon brush. Basically it may hold any other type of brush like brushes being based on combinations of metal particles with Teflon.
  • brush 31 extends slightly over the lower end of insert 20, preventing a mechanical contact between the insert 20 and slipring track 40, which may damage the slip ring track. Accordingly the small piece of brush 41 is outside of the insert 20, while the remaining partial length of brush 41 is inside of insert 20.
  • At least one screw 13, although not part of the brush holder, is provided for fixing the brush holder to any part of a machine.
  • a plurality of brush holders is combined to a brush block.
  • a brush holder contact 12 is preferably fixed by means of at least one screw 14 to the housing and to the insert.
  • the housing provides a thread 59 for screw 14.
  • Electrical contact between the brush holder contact 12 and the insert 20 is provided by mechanical pressure by screw 14.
  • Figure 2 shows a brush holder 10 in side view. Furthermore a slip ring track 40 or sliding track is shown, on which the contact brush 41 is sliding, providing electric contact.
  • the slipring track 40 may be of any conductive material like steel or brass.
  • Figure 3 shows the insert 20.
  • the insert is made of one piece of metal and has a first sidewall 21, a second sidewall 22 and a third sidewall 23, all sidewalls being in the 90° angle with respect to their neighbor side walls.
  • a spring element 24 is next to third sidewall 23. It is obvious that the spring element 24 may also be next to first sidewall 21.
  • the spring element 24 preferably has an angle of 90° with respect to third sidewall 23, although there may be slightly different angles.
  • the spring element As the spring element can be bent due to its elasticity, it may change its angle with respect to third sidewall 23.
  • the spring element 24 may assert a slight force to the carbon brush to provide for precise guiding within the insert.
  • the insert furthermore has a first contact surface 25 and a second contact surface 26. One of these contact surfaces may also be sufficient to provide for electrical contact between the insert and brush holder contact 12.
  • a first screw hole 27 and the second screw hole 28 are provided.
  • these screw holes may have a thread or at least a slightly smaller diameter than the outer diameter of the screw to be inserted through the holes, causing electrical contact between the contact surfaces and the screw.
  • FIG 4 a metal plate before bending to an insert is shown.
  • This figure further shows a first recess 51, second recess 52 and third recess 53.
  • These the recesses provide for some space between the side walls and the brush which may aid in removing debris which otherwise could lead to sticking of the brush.
  • recess 52 may be omitted, as the flexibility of spring element 24 allows for some movement of the brush, even when debris is present between the brush and the sidewall.
  • first bending edge 54, second bending edge 55, third bending edge 56, first contact surface bending edge 57 and second contact surface bending edge 58 are shown.
  • Figure 5 shows a side view of the insert.
  • Figure 6 shows a bottom view of the insert.
  • a brush 31 is shown. It is connected via braid 32 to contact plate 33. Furthermore spring 35 between contact plate 33 and brush 31 causes pressure of the brush against slipring track 40.
  • contact plate 33 has at least one fixation hole 34.
  • FIG 9 a sectional view of a dual brush holder 50 is shown. Basically the elements are comparable to the previous brush holder. Due to the higher current a high carbon brush holder contact 15 is provided.
  • Figure 10 shows a side view of the dual brush holder 50. Here two brushes 31a and 31b are shown.
  • FIG 11 a perspective view of a brush holder 10 is shown, while in figure 12 a perspective view of dual brush holder 50 is shown.
  • Figure 13 shows the arrangement of two inserts 20a, 20b from a bottom view with in the dual brush holder. They are rotated against each other at 180° so that the spring elements 24 can interleave. This arrangement requires less space compared to an arrangement without rotation.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
EP11181549.4A 2011-09-16 2011-09-16 Modularer Bürstenhalter Active EP2571115B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11181549.4A EP2571115B1 (de) 2011-09-16 2011-09-16 Modularer Bürstenhalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11181549.4A EP2571115B1 (de) 2011-09-16 2011-09-16 Modularer Bürstenhalter

Publications (2)

Publication Number Publication Date
EP2571115A1 true EP2571115A1 (de) 2013-03-20
EP2571115B1 EP2571115B1 (de) 2018-08-15

Family

ID=44872175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11181549.4A Active EP2571115B1 (de) 2011-09-16 2011-09-16 Modularer Bürstenhalter

Country Status (1)

Country Link
EP (1) EP2571115B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104458233B (zh) * 2014-12-03 2017-07-11 上海博泽电机有限公司 碳刷架检测装置及其检测碳刷架中插片松紧度的方法
CN114498230A (zh) * 2021-12-20 2022-05-13 中国航天空气动力技术研究院 一种电刷装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58179144A (ja) * 1982-04-09 1983-10-20 Hitachi Ltd 小形回転電機用ブラシホルダ
JPS62163542A (ja) * 1986-01-10 1987-07-20 Hitachi Ltd 電動機の刷子保持装置
GB2195835A (en) * 1986-09-08 1988-04-13 Johnson Electric Ind Mfg Anti-chatter brush assembly in an electric motor
JPS6363593U (de) * 1986-10-15 1988-04-26
EP0358812A1 (de) 1988-09-16 1990-03-21 Siemens Aktiengesellschaft Metall-Bürstenköcher für eine Mehrschicht-Bürste
US5220588A (en) 1991-05-20 1993-06-15 Picker International, Inc. Low inertia brush block assembly
GB2433651A (en) * 2005-12-09 2007-06-27 Bosch Gmbh Robert Vibration decoupling mounting of brushes or brush holders
WO2008022631A1 (de) * 2006-08-23 2008-02-28 Temic Automotive Electric Motors Gmbh Gleichstrommaschine
DE102009034884A1 (de) 2009-07-27 2011-02-03 Schunk Kohlenstofftechnik Gmbh Kontaktstückhalter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7545072B2 (en) * 2005-10-13 2009-06-09 Culsforth Products, Inc. Resilient member for a brush holder assembly
DE102009025340B4 (de) * 2009-06-18 2011-02-24 Metabowerke Gmbh Elektrohandwerkzeuggerät mit Schleifbürsten

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58179144A (ja) * 1982-04-09 1983-10-20 Hitachi Ltd 小形回転電機用ブラシホルダ
JPS62163542A (ja) * 1986-01-10 1987-07-20 Hitachi Ltd 電動機の刷子保持装置
GB2195835A (en) * 1986-09-08 1988-04-13 Johnson Electric Ind Mfg Anti-chatter brush assembly in an electric motor
JPS6363593U (de) * 1986-10-15 1988-04-26
EP0358812A1 (de) 1988-09-16 1990-03-21 Siemens Aktiengesellschaft Metall-Bürstenköcher für eine Mehrschicht-Bürste
US5220588A (en) 1991-05-20 1993-06-15 Picker International, Inc. Low inertia brush block assembly
GB2433651A (en) * 2005-12-09 2007-06-27 Bosch Gmbh Robert Vibration decoupling mounting of brushes or brush holders
WO2008022631A1 (de) * 2006-08-23 2008-02-28 Temic Automotive Electric Motors Gmbh Gleichstrommaschine
DE102009034884A1 (de) 2009-07-27 2011-02-03 Schunk Kohlenstofftechnik Gmbh Kontaktstückhalter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104458233B (zh) * 2014-12-03 2017-07-11 上海博泽电机有限公司 碳刷架检测装置及其检测碳刷架中插片松紧度的方法
CN114498230A (zh) * 2021-12-20 2022-05-13 中国航天空气动力技术研究院 一种电刷装置
CN114498230B (zh) * 2021-12-20 2023-10-17 中国航天空气动力技术研究院 一种电刷装置

Also Published As

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