EP0081828A2 - Balai en charbon pour machines électriques - Google Patents

Balai en charbon pour machines électriques Download PDF

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Publication number
EP0081828A2
EP0081828A2 EP82111465A EP82111465A EP0081828A2 EP 0081828 A2 EP0081828 A2 EP 0081828A2 EP 82111465 A EP82111465 A EP 82111465A EP 82111465 A EP82111465 A EP 82111465A EP 0081828 A2 EP0081828 A2 EP 0081828A2
Authority
EP
European Patent Office
Prior art keywords
carbon brush
flank
brush according
curvature
groove
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
EP82111465A
Other languages
German (de)
English (en)
Other versions
EP0081828A3 (en
EP0081828B1 (fr
Inventor
Peter Dipl.-Ing. Hoffmann
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.)
Hoffmann and Co Elektrokohle AG
Original Assignee
Hoffmann and Co Elektrokohle 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 Hoffmann and Co Elektrokohle AG filed Critical Hoffmann and Co Elektrokohle AG
Priority to AT82111465T priority Critical patent/ATE18963T1/de
Publication of EP0081828A2 publication Critical patent/EP0081828A2/fr
Publication of EP0081828A3 publication Critical patent/EP0081828A3/de
Application granted granted Critical
Publication of EP0081828B1 publication Critical patent/EP0081828B1/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
    • H01R39/26—Solid sliding contacts, e.g. carbon brush

Definitions

  • the invention relates to a carbon brush for electrical machines with a contact surface or the like in cross section a hollowed profile for contact with a collector. Slip ring with nominal radius.
  • the tread has a uniform circular arc-shaped profile over its width, the radius of which corresponds to the nominal radius.
  • the flanks of the profile lying on both sides of the central plane therefore have the same radius of curvature and the same center of curvature lying on the plane. This ensures that the running surface is as large as possible in contact with the collector and thus one as possible
  • the aim is to distribute electricity across the entire area.
  • carbon brushes generally require a break-in period during which the ideal operating conditions have not yet been reached.
  • the carbon brush may be asymmetrically positioned on the collector, which is due in particular to the inevitable play of the carbon brush in the brush holder.
  • the system can fail during peak loads and result in expensive downtimes and repair times.
  • the object of the invention is to create a carbon brush with improved running-in behavior.
  • flanks of the tread pattern lying on both sides of the central plane and inclined to it run without curvature or with less curvature than the nominal radius tangential to a circle with nominal radius.
  • the two flanks of the tread pattern are therefore steeper than the nominal radius speaking circle, and when the carbon brush is attached to the collector, this initially has a line contact symmetrical on both sides of the central plane. This also results in a symmetrical load, with actuating forces acting perpendicular to the tread flanks, which force a geometric and thus also an electrical symmetry.
  • the running-in process is thus largely symmetrical until, due to increasing wear of the contact surface of the carbon brush, more and more full-surface contact of the collector on both flanks of the tread pattern is achieved in accordance with the continuous operating state.
  • each flank of the profile is curved with respect to a center of curvature lying on the other side of the center plane.
  • each flank can be formed by rib-like elevations which run in the transverse direction of the contact surface and are separated from one another by groove-like depressions. It is particularly advantageous if the rib-like elevations of one flank continue the groove-like depressions of the other flank run. This also makes manufacturing easier.
  • the groove-like depressions in each flank of the contact surface can, for example, have a flat course perpendicular to the central plane, or they can be designed to decrease at a clearance angle with respect to a plane perpendicular to the central plane.
  • the rib-like elevations preferably have a rectangular cross section.
  • the carbon brush 1 shown in Fig. 1 has a tread 2, which is formed by raised rib-like Surface areas 4, 5.
  • the surface areas 4 lie on one side and the surface areas 5 on the other side of the longitudinal center plane or symmetry plane 6 of the carbon brush 1.
  • Each rib-like raised surface area 4, 5 has a rectangular cross section and a cylindrically curved surface. These surfaces of the rib-like elevations 4, 5 form the two flanks of the contact surface profile of the carbon brush 1 on both sides of the central plane 6.
  • each raised surface area 4, 5 is curved with a radius of curvature R1, specifically around a center point M ′, M ′′, which is not offset on the central plane 6, but from this to the other side.
  • the radius of curvature R1 is slightly larger than the target radius R2 of the collector with which the brush is to be used.
  • the raised surface areas 4, 5 curved with radius R1 lie tangentially to a circle with a nominal radius R2 around a center point M lying on the central plane 6.
  • the initial contact with a collector with radius R2 thus takes place in a line-like manner symmetrically on both sides of the central plane 6, whereby the areas of contact widen rapidly as the wear progresses, but still lie symmetrically to the central plane 6. Only after extensive wear does the low point of the tread pattern on the middle level 6 come into contact with the collector circle profile with radius R2.
  • Each raised surface area 4 or 5 continues on the other side of the central plane 6 in a groove-like recessed surface area 8 or 9.
  • Its profile course transverse to the central plane 6 is in itself arbitrary. It can, for example, as shown in FIG. 2 at 8 ', continue the curvature of the raised surface area 4 with the radius R1 around the center point M ". However, as indicated in FIG. 1 at 8, they can also be one have a flat course at right angles to the central plane 6. Finally, a course is indicated at 8 ′′ in FIG. 1, in which the groove-like surface area is designed to have a clearance angle with respect to the plane perpendicular to the central plane 6.
  • Fig. 3 shows an embodiment in which the rib-like raised surface areas 4, 5 of the two flanks of the contact surface profile have a flat course inclined to the central plane 6, so that there is a dovetail-shaped contact surface profile. These surfaces are tangent to a circle with the nominal radius R2, the contact at the contact points 11 initially being even more linear than in the embodiment according to FIGS. 1 and 2.
  • the profiling of the contact surface of the carbon brush according to the invention can advantageously be carried out simultaneously with the pressing of the carbon brush, in which case no reworking of the pressed contact surface to adapt to the collector is required when the brush is finished.
EP82111465A 1981-12-10 1982-12-10 Balai en charbon pour machines électriques Expired EP0081828B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82111465T ATE18963T1 (de) 1981-12-10 1982-12-10 Kohlebuerste fuer elektrische maschinen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813148996 DE3148996A1 (de) 1981-12-10 1981-12-10 Kohlebuerste fuer elektrische maschinen
DE3148996 1981-12-10

Publications (3)

Publication Number Publication Date
EP0081828A2 true EP0081828A2 (fr) 1983-06-22
EP0081828A3 EP0081828A3 (en) 1984-03-21
EP0081828B1 EP0081828B1 (fr) 1986-04-02

Family

ID=6148411

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111465A Expired EP0081828B1 (fr) 1981-12-10 1982-12-10 Balai en charbon pour machines électriques

Country Status (3)

Country Link
EP (1) EP0081828B1 (fr)
AT (1) ATE18963T1 (fr)
DE (2) DE3148996A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0373902A2 (fr) * 1988-12-14 1990-06-20 Mitsubishi Denki Kabushiki Kaisha Assemblage de balai électrique
DE19816477A1 (de) * 1998-04-14 1999-10-21 Bsh Bosch Siemens Hausgeraete Kohlebürste
WO2005027281A1 (fr) * 2003-09-03 2005-03-24 Robert Bosch Gmbh Moteur electrique
US8558429B2 (en) 2011-01-05 2013-10-15 General Electric Company Systems, methods, and apparatus for lifting brushes of an induction motor
US8648515B2 (en) 2009-03-03 2014-02-11 Johnson Electric S.A. Brush design for electric motor having commutator
US8674581B2 (en) 2011-01-05 2014-03-18 General Electric Company Systems, methods, and apparatus for shorting slip rings of an induction motor
WO2015155321A1 (fr) * 2014-04-10 2015-10-15 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Moteur électrique et balai pour moteur électrique
EP4002657A1 (fr) * 2020-11-13 2022-05-25 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Bamberg Moteur électrique doté d'un commutateur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438868C2 (de) * 1994-11-03 2002-01-24 Bosch Gmbh Robert Kohlebürste für einen Gleichstrommotor
CN211404958U (zh) * 2019-11-21 2020-09-01 广东德昌电机有限公司 有刷电机及其电刷结构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1174253A (fr) * 1957-04-17 1959-03-09 Perfectionnements aux balais de moteurs électriques
FR2437710A1 (fr) * 1978-09-26 1980-04-25 Lorraine Carbone Balai avec face frottante striee pour machines electriques

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6802635U (de) * 1968-01-11 1969-03-13 Rau Swf Autozubehoer Kohlebuerste fuer elektrische maschinen
GB1309104A (en) * 1970-08-26 1973-03-07 Morganite Carbon Ltd Electrical contact brushes for conductive co-operation with a rotating member of an electrical machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1174253A (fr) * 1957-04-17 1959-03-09 Perfectionnements aux balais de moteurs électriques
FR2437710A1 (fr) * 1978-09-26 1980-04-25 Lorraine Carbone Balai avec face frottante striee pour machines electriques

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0373902A2 (fr) * 1988-12-14 1990-06-20 Mitsubishi Denki Kabushiki Kaisha Assemblage de balai électrique
EP0373902A3 (fr) * 1988-12-14 1990-11-28 Mitsubishi Denki Kabushiki Kaisha Assemblage de balai électrique
US4983873A (en) * 1988-12-14 1991-01-08 Mitsubishi Denki Kabushiki Kaisha Electrical brush assembly
DE19816477A1 (de) * 1998-04-14 1999-10-21 Bsh Bosch Siemens Hausgeraete Kohlebürste
WO2005027281A1 (fr) * 2003-09-03 2005-03-24 Robert Bosch Gmbh Moteur electrique
US8648515B2 (en) 2009-03-03 2014-02-11 Johnson Electric S.A. Brush design for electric motor having commutator
US8558429B2 (en) 2011-01-05 2013-10-15 General Electric Company Systems, methods, and apparatus for lifting brushes of an induction motor
US8674581B2 (en) 2011-01-05 2014-03-18 General Electric Company Systems, methods, and apparatus for shorting slip rings of an induction motor
WO2015155321A1 (fr) * 2014-04-10 2015-10-15 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Moteur électrique et balai pour moteur électrique
EP4002657A1 (fr) * 2020-11-13 2022-05-25 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Bamberg Moteur électrique doté d'un commutateur

Also Published As

Publication number Publication date
ATE18963T1 (de) 1986-04-15
DE3148996A1 (de) 1983-06-23
EP0081828A3 (en) 1984-03-21
DE3270312D1 (en) 1986-05-07
EP0081828B1 (fr) 1986-04-02

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