EP0624937B1 - Balai de charbon ainsi qu'un procédé pour arranger et fixer un conducteur torsade de contrÔle dans celui-ci - Google Patents

Balai de charbon ainsi qu'un procédé pour arranger et fixer un conducteur torsade de contrÔle dans celui-ci Download PDF

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Publication number
EP0624937B1
EP0624937B1 EP94107254A EP94107254A EP0624937B1 EP 0624937 B1 EP0624937 B1 EP 0624937B1 EP 94107254 A EP94107254 A EP 94107254A EP 94107254 A EP94107254 A EP 94107254A EP 0624937 B1 EP0624937 B1 EP 0624937B1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
braided
wire
accordance
insulating
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
EP94107254A
Other languages
German (de)
English (en)
Other versions
EP0624937A1 (fr
Inventor
Anton Swoboda
Edmund Kübler
Horst Ulm
Günter Schardt
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.)
Schunk Kohlenstofftechnik GmbH
Original Assignee
Schunk Kohlenstofftechnik 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 Schunk Kohlenstofftechnik GmbH filed Critical Schunk Kohlenstofftechnik GmbH
Publication of EP0624937A1 publication Critical patent/EP0624937A1/fr
Application granted granted Critical
Publication of EP0624937B1 publication Critical patent/EP0624937B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/12—Manufacture of brushes
    • 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

  • the invention relates to a carbon brush with a signal wire for indicating a certain consumption of carbon brushes, the signal wire being stamped into a recess, preferably running in the longitudinal direction of the carbon brush, such as a blind bore and spaced apart from the bottom of the recess, insulating material being on the floor.
  • the invention further relates to a method for arranging and fastening a section of a signaling wire in a carbon brush.
  • FR-A 2 223 858 it is provided to arrange a signaling wire in a sleeve made of insulating material, which extends at least in regions within a correspondingly adapted recess of the carbon brush. Since the signal wire itself is surrounded by an insulating material, problems can arise when it is clearly arranged in the sleeve.
  • optical conductors are used to detect carbon brush wear, via which light signals are transmitted or received.
  • a carbon brush for collector motors is known from DE 28 04 547 A1, in which a signaling wire surrounded by an insulating jacket is arranged in a longitudinal bore.
  • suitable adhesive materials must be used. However, especially in the case of jerky bumps, it is not ensured that the signaling wire is not moved.
  • a prefabricated plastic sleeve is provided according to G 84 33 023 U1, which can be inserted into a bore in a carbon brush.
  • the signal wire is then inserted into the plastic part itself. So that the signaling wire remains in the sleeve, it is slotted so that the signaling wire is clamped between the longitudinal halves of the sleeve which can be moved relative to one another when it is introduced into the carbon brush. High accuracy of fit is required to ensure that the sleeve clamps the signal wire. Regardless of this, the sleeve can melt at the high temperatures occurring in carbon brushes, so that an uncontrolled displacement of the signaling wire takes place.
  • EP 0 512 234 A2 provides that the signaling wire is received by a sleeve made of metal and squeezed with it. This results in a clear position fixing of the signaling wire in the sleeve, which in turn can be clearly fixed in position with a circumferential flange-like edge in a correspondingly adapted bore of the carbon brush.
  • the free end of the signal wire protrudes above the sleeve.
  • the free end of the signal wire is spaced from the bottom of the bore receiving the sleeve in the carbon brush.
  • Carbon brushes of the type mentioned are also e.g. can be found in DE 41 11 206 A1 or DE-OS 21 32 053.
  • the former are surrounded at least on the inside or outside by sleeves made of insulating material.
  • one end of the signal wire is inserted into a mini carbon brush according to US Pat. No. 4,636,778, which in turn is surrounded together with the signal wire by an insulating sleeve which is glued into a blind hole in a carbon brush.
  • the present invention is based on the problem of developing a carbon brush of the type mentioned at the outset in such a way that a signal is only triggered via the signaling wire if wear and tear has occurred to an unacceptable extent, that is to say that an early signal cannot be given.
  • manufacturing simplifications should be given, but at the same time allow a check, whether the signal wire is properly arranged in the carbon brush.
  • the object is essentially achieved in that the insulating material is an inherently rigid insulating layer in the form of an insulating plate or an insulating plate covering the bottom of the recess.
  • This can be fiber material or hard paper, e.g. is known from transformer technology and is marketed under the name Pertinax®.
  • the free end of the signaling wire should touch the insulating layer like the insulating plate, that is to say preferably stand on it.
  • the signal wire is surrounded laterally by an insulating material as ramming powder, that is to say stamped in by it is.
  • an insulating material as ramming powder, that is to say stamped in by it is.
  • This can be a thermoset or a mixture of thermosets, e.g. are sold under the name Minolite®.
  • the signaling wire namely its core, is arranged within the recess in such a way that there is an equal circumferential distance between the core and the side wall or the bottom of the recess.
  • the bottom of the recess should run perpendicularly or essentially perpendicularly to its inner wall.
  • the recess should be a blind hole with a flat bottom surface.
  • the signal wires should be z. B. made of metal sleeves such Crimp sleeves must be enclosed. These can be preassembled on the signaling wires on automatic assembly machines, so that there are no disadvantages in terms of production technology.
  • the sleeves result in a good fit of the signaling wire in the hole on the one hand and on the other hand a higher mechanical strength is achieved (increase the pull-out strength).
  • the sleeve should end at a distance from the free end of the signal wire.
  • the upper end should advantageously run below the plane spanned by the surface of the carbon brush.
  • this is not a mandatory feature.
  • a stripping coating covering the ramming powder is present between the signaling wire and the carbon brush surface.
  • a flat insulating material to be unwound from a roll is passed through the bore and punched out of these insulating plates with a punching tool, the insulating plate or the insulating plate being introduced into the blind hole by means of the punching tool or a stamp .
  • a matrix can optionally be present between the carbon brush and the insulating material band in order to facilitate the punching out of the insulating plate or the insulating plate.
  • the signaling wire is cut to length using a cutting tool such as cable shears, a voltage being applied between the cutting tool and the carbon brush to check the insulated arrangement of the signaling wire section in the blind hole.
  • a cutting tool such as cable shears
  • a section of a carbon brush (10) is shown, in which a current-carrying wire (12) and a shut-off nipple (14) are arranged.
  • the shut-off nipple (14) consists of insulating material and is spring-biased in the direction of the longitudinal axis (16) of the carbon brush (12), preferably by means of a helical spring (18).
  • Both the stranded wire (12) and the shut-off nipple (14) are stamped into powdered-in metal powder (20) or (22).
  • An insulating plate (24) on which the helical spring (18) is supported can also be arranged between the ramming powder (22) covering the shut-off nipple (14) and the end face facing it.
  • a section (26) of a signaling wire (28) also runs inside the carbon brush (10), via which a signal is then triggered when the carbon brush (10) interacting with a commutator or slip ring (not shown) is worn to the extent that a Renewing is necessary, that is, before the carbon brush (10) is consumed to such an extent that the shut-off nipple (14) lifts the carbon brush (10) off the slip ring or the commutator.
  • the signaling wire (28) is arranged in a blind hole (30) running essentially parallel to the longitudinal axis (16), the bottom surface (32) of which is flat, that is to say perpendicular or essentially perpendicular to the inner wall (34) of the blind hole (30). runs.
  • coal dust creates a conductive connection between the carbon brush (10) and the signaling wire ( 28), d. H. to its conductive core (36), which is surrounded by an insulation jacket (38).
  • the bottom surface (32) is covered with an insulating plate or plate (40), e.g. can consist of fiber material or hard paper.
  • the free end (42) of the core (36) stands on the insulating plate (40).
  • the insulation jacket (38) surrounding the core (36) can extend to the surface of the insulating plate or be stripped at a distance from it, as is illustrated in principle with reference to FIG. 1.
  • the circumference of the section (26) is stamped in, namely by an insulating stamped powder, which is or may contain a thermoset.
  • An insulating stamped powder which is or may contain a thermoset.
  • a material sold under the name Minolite® can preferably be used.
  • the cross section of the blind hole (30) is matched to the cross section of the core (36) of the section (26) of the signaling wire (28) surrounding the insulation jacket (38) and the thickness ( b) the insulating plate (40) chosen so that these and the distance (a) between the core (36) and the inner surface of the blind hole (30) are the same.
  • the stamped powder (34) is covered on the outside with a coating (44) which extends from the surface of the carbon brush (10) to the outside of the insulation jacket (38).
  • an insulation tape is unwound from a roll - above the blind hole opening - as is to be clarified in principle in FIG. 3 (46) moved in order to be punched out directly above the blind hole (30) by means of a punching tool (48) and to be pushed into the blind hole with the punching tool (48).
  • a support (50) can be provided between the carbon brush (10) and the insulating tape material (46) for support.
  • the signal wire (28) itself is also unwound from a roll and cut to the desired length. This takes place after the section (26) has been stamped into the blind hole (30). During the cutting, a voltage of z. B. 500 V, which is measured against the carbon brush (10). If the section (26) is insulated in the blind hole (30), no conductive connection between the cutting tool (48) and the carbon brush (10) may be determined. This measure results in a quality control which takes place simultaneously with the assembly of the carbon brush (10) with the signaling wire (28).
  • the diameter of the blind hole (30) can e.g. 2.5 mm at a height of 5.3 mm.
  • Typical dimensions for the cross section of the signaling wire (28) including the insulation jacket (38) are approximately 1.1 mm, the insulation jacket (38) having a thickness in the range between 0.125 and 0.25 mm.
  • the thickness (b) of the insulation plate (40) and thus the distance (a) between the core (36) of the signaling wire (28) and the inner wall (34) of the blind hole (30) can be in the range of approximately 0.7 mm .
  • insulation jacket (38) should consist of, for example, a polyester elastomer, Teflon or another temperature-resistant insulation.
  • the paint finish (44) should be a two-component adhesive based on epoxy resin.
  • FIG. 4 shows an embodiment of the teaching according to the invention to the extent that the signaling strand section (26) within the blind hole (30) is surrounded by a sleeve (50), preferably made of metal, such as a crimp sleeve.
  • the crimp sleeve (50) ends at a distance from the free end (42) of the section (26) of the signaling wire (28).
  • the outside of the sleeve should also be completely surrounded by ramming powder. This means that the upper edge (52) is covered by ramming powder, that is to say runs below the plane spanned by the surface of the carbon brush (10).
  • the sleeve results on the one hand in a good fit of the signaling wire (28) in the blind hole (30) and on the other hand a higher mechanical strength is achieved, i. H. the pull-out strength is increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Claims (12)

  1. Balai en charbon (10) équipé d'un conducteur torsadé de contrôle (26, 28) pour signaler un degré défini d'usure du charbon, ce conducteur étant monté avec bourrage dans un évidement (30) creusé de préférence selon la direction longitudinale (16) du balai, tel qu'un trou borgne s'arrêtant à une certaine distance de fond (32) de l'évidement qui est garni d'un matériau isolant,
    caractérisé en ce que
    le matériau isolant est une couche isolante (40) rigide recouvrant le fond (32) de l'évidement (30), sous la forme d'une plaque ou d'une plaquette isolante.
  2. Balai en charbon selon la revendication 1,
    caractérisé en ce que
    la plaque ou la plaquette isolante est faite d'un matériau fibreux ou de papier dur.
  3. Balai en charbon selon la revendication 1 ou 2,
    caractérisé en ce que
    le conducteur torsadé de contrôle (26, 28) touche par son extrémité libre (42) la couche isolante (40) ou est posée sur elle.
  4. Balai en charbon selon au moins une des revendications précédentes,
    caractérisé en ce que
    le conducteur torsadé de contrôle (26, 28) est entouré latéralement par un matériau isolant tel qu'une poudre de bourrage.
  5. Balai en charbon selon au moins une des revendications précédentes,
    caractérisé en ce que
    l'épaisseur (b) de la couche isolante (40) est égale à la distance (a) existant entre la face externe de l'âme (36) du conducteur torsadé de contrôle (26, 28) et la paroi interne de l'évidement (30).
  6. Balai en charbon selon au moins une des revendications précédentes,
    caractérisé en ce que
    la poudre de bourrage et le matériau de la couche isolante (40) ont des résistances spécifiques égales ou presque.
  7. Balai en charbon selon au moins une des revendications précédentes,
    caractérisé en ce que
    entre le conducteur torsadé de contrôle (28) et la face supérieure du balai, une couche de vernis (44) recouvre la poudre de bourrage.
  8. Balai en charbon selon au moins une des revendications précédentes,
    caractérisé en ce que
    la partie (26) du conducteur (28) est entourée par une douille (50), métallique de préférence, telle qu'une douille sertie dont la périphérie et les bords sont de préférence totalement entourés par la poudre de bourrage.
  9. Procédé pour placer et fixer une partie d'un cordon indicateur à l'intérieur d'un balai de charbon, selon au moins la revendication 1, comportant les étapes suivantes :
    - alésage d'un trou borgne dont le fond est plan ou sensiblement plan,
    - introduction d'une couche isolante recouvrant le fond du trou borgne,
    - engagement du morceau de conducteur dans le trou borgne jusqu'à ce que son extrémité touche la couche isolante,
    - bourrage de matériau isolant autour du conducteur,
    - éventuellement, dépôt de vernis recouvrant la poudre de bourrage.
  10. Procédé selon la revendication 9,
    caractérisé en ce que
    le conducteur torsadé de contrôle, avant son engagement dans le trou borgne, est, au moins dans la partie qui se trouvera à l'intérieur du trou, entouré par une douille.
  11. Procédé selon la revendication 9,
    caractérisé en ce qu'
    on amène au-dessus du trou borgne, en provenance d'un rouleau, un matériau isolant plan, dans lequel on estampe directement la plaque isolante au moyen d'un outil de découpage de manière à introduire ensuite directement, dans le trou borgne, cette plaque isolante par l'intermédiaire de l'outil ou d'une partie de celui-ci.
  12. Procédé selon une quelconque des revendications 9 à 11,
    caractérisé en ce que
    le conducteur torsadé de contrôle est découpé à longueur par un outil de coupe et qu'une tension est établie entre cet outil et le balai en charbon pour contrôler que le conducteur est bien isolé, dans la position qu'il occupe à l'intérieur du trou.
EP94107254A 1993-05-11 1994-05-10 Balai de charbon ainsi qu'un procédé pour arranger et fixer un conducteur torsade de contrÔle dans celui-ci Expired - Lifetime EP0624937B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4315622A DE4315622C2 (de) 1993-05-11 1993-05-11 Kohlebürste sowie Verfahren zum Anordnen und Befestigen einer Meldelitze in einer solchen
DE4315622 1993-05-11

Publications (2)

Publication Number Publication Date
EP0624937A1 EP0624937A1 (fr) 1994-11-17
EP0624937B1 true EP0624937B1 (fr) 1996-10-30

Family

ID=6487754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94107254A Expired - Lifetime EP0624937B1 (fr) 1993-05-11 1994-05-10 Balai de charbon ainsi qu'un procédé pour arranger et fixer un conducteur torsade de contrÔle dans celui-ci

Country Status (5)

Country Link
US (1) US5488261A (fr)
EP (1) EP0624937B1 (fr)
AT (1) ATE144863T1 (fr)
DE (2) DE4315622C2 (fr)
ES (1) ES2093472T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012209216A1 (de) 2012-05-31 2013-12-05 Schunk Wien Gesellschaft M.B.H. Kohlebürste mit isolierendem Stampfpulver
DE102012209222A1 (de) * 2012-05-31 2013-12-05 Schunk Kohlenstofftechnik Gmbh Kohlebürste mit Zentrierhülse

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
US5941370A (en) 1996-09-10 1999-08-24 Nichols; Bruce W. Electrical contact wear
US5870026A (en) * 1997-07-15 1999-02-09 The Morgan Crucible Company Plc Brush wear indicator
DE102006033231A1 (de) * 2006-07-18 2008-01-24 Siemens Ag Einrichtung zum Anschluss eines zum Einsatz in einem Kraftstoffbehälter insbesondere eines Kraftfahrzeuges vorgesehenen Elektromotors
US8618943B2 (en) 2007-05-24 2013-12-31 Cutsforth, Inc. Brush holder assembly monitoring apparatus, assembly, system and method
US7705744B2 (en) * 2007-05-24 2010-04-27 Cutsforth Products, Inc. Monitoring systems and methods for monitoring the condition of one or more components of an electrical device
AU2007242948B2 (en) * 2007-12-13 2010-04-01 Hoffmann & Co Elektrokohle Ag Carbon brush with connecting cable
DE102014202556C5 (de) * 2014-02-12 2019-07-18 Schunk Carbon Technology Gmbh Kohlebürstenanordnung
CA2985094C (fr) 2015-06-01 2022-03-22 Cutsforth, Inc. Surveillance de l'usure et des vibrations d'un balai
CA3008957C (fr) 2016-01-11 2020-07-14 Cutsforth, Inc. Systeme de controle destine a un appareil de mise a la terre
CA3114764A1 (fr) 2018-10-04 2020-04-09 Cutsforth, Inc. Systeme et procede de surveillance de l'etat d'un ou de plusieurs composants d'une machine electrique
CN113243063B (zh) 2018-10-04 2023-11-07 科茨福斯有限公司 用于监控电机的一个或多个元件的状态的系统和方法

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012209216A1 (de) 2012-05-31 2013-12-05 Schunk Wien Gesellschaft M.B.H. Kohlebürste mit isolierendem Stampfpulver
DE102012209222A1 (de) * 2012-05-31 2013-12-05 Schunk Kohlenstofftechnik Gmbh Kohlebürste mit Zentrierhülse
WO2013178791A1 (fr) 2012-05-31 2013-12-05 Schunk Wien Gesellschaft M.B.H. Balai de charbon doté de poudre isolante compactée

Also Published As

Publication number Publication date
ES2093472T3 (es) 1996-12-16
ATE144863T1 (de) 1996-11-15
DE4315622C2 (de) 1997-01-16
US5488261A (en) 1996-01-30
DE59400929D1 (de) 1996-12-05
DE4315622A1 (de) 1994-11-17
EP0624937A1 (fr) 1994-11-17

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