EP0232209A1 - Detection device for wear threshold of friction-type electrical contacts - Google Patents

Detection device for wear threshold of friction-type electrical contacts Download PDF

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Publication number
EP0232209A1
EP0232209A1 EP87420003A EP87420003A EP0232209A1 EP 0232209 A1 EP0232209 A1 EP 0232209A1 EP 87420003 A EP87420003 A EP 87420003A EP 87420003 A EP87420003 A EP 87420003A EP 0232209 A1 EP0232209 A1 EP 0232209A1
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EP
European Patent Office
Prior art keywords
wear
threshold
contact
optical fiber
flux
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.)
Withdrawn
Application number
EP87420003A
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German (de)
French (fr)
Inventor
Gérard Marichy
Michel Chambon
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Ferraz SA
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Ferraz SA
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Publication date
Application filed by Ferraz SA filed Critical Ferraz SA
Publication of EP0232209A1 publication Critical patent/EP0232209A1/en
Withdrawn legal-status Critical Current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
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear

Definitions

  • the present invention relates to electrical contacts of the friction type, such as power brushes for rotating machines and shoes or current collection pads for subway trains or other rail vehicles.
  • these contacts are generally made of a relatively soft conductive material (most often based on graphite) in order to ensure good bearing against the metal part with which they cooperate, and to avoid surface damage to it. this.
  • This material consequently wears out as the electric machine which it operates is operating, so that in order to avoid any untimely damage, it is necessary to provide detectors capable of emitting an alarm signal when wear reaches a certain threshold, requiring replacement of the contact.
  • the detector devices usually used are electrically operated, so that the same brush or shoe is simultaneously associated with two separate electrical circuits, namely that intended for supplying the electric machine to which it is linked, and that corresponding to the signal. alarm. This duality of circuits within the same electrical element obviously presents risks of interference.
  • the present invention mainly intends to remedy, which consists essentially in ensuring the detection of the wear threshold using at least one optical fiber which is associated with a transmitter and with a flux receiver. luminous and a part of which is inserted into the contact up to a thickness corresponding to the level of the wear threshold, so that as a result of the destruction following the wear of the material which forms the contact, the luminous flux is obscured when wear reaches the aforementioned threshold.
  • reference 1 designates the ring or "collector” intended for supplying the armature 2 of an electric motor or other rotary machine.
  • Collector 1 is associated with two brushes 3 opposite one another, each of these being connected to a source of electric current 4.
  • two optical fiber systems 5 one end is associated with a light emitter shown diagrammatically at 6, while the opposite end cooperates with a receiving device 7.
  • the optical fiber or fibers which make up each detector system 5 penetrate inside the brush 3 which corresponds to it, so that the luminous flux is obscured when the wear reaches the expected threshold, this occultation causing, at the level of the receiver 7, the emission of a sound, light or other signal, warning the user of the need to proceed the replacement of the brush 3 envisaged.
  • Fig. 2 illustrates in detail an embodiment of one of the two optical fiber systems 5.
  • a single optical fiber, referenced 15 which at the level of the brush 3 with which it is associated is folded over. itself at 180 ° to form a loop.
  • the protective sheath 8 of the fiber 15 preferably stops at the level of the seal 10 so that the two strands of the loop of the fiber 15 are held against each other with the smallest possible footprint.
  • the loop formed by the fiber 15 at the bottom of the extension 9a does not affect the passage of the light flux emitted by the emitter 6, so that the receiver 7 perceives this flux.
  • the end of the loop of the optical fiber 15 is itself eliminated. The light flux is then obscured, so that the receiver 7 automatically transmits the alarm signal.
  • each system 5 comprises two optical fibers referenced 25 and 25 ′, engaged parallel to one another inside a socket 11 introduced into the brush 3, in the same manner as in FIG. 2.
  • This sleeve is closed by a reflector or mirror 12 crimped at the end of said sleeve, so as to be located at the level of the wear threshold x- provided.
  • Fig. 5 illustrates an embodiment of the invention which uses, for each system 5, a single optical fiber referenced 35, of the bidirectional type intended to be associated with an optical coupler capable of selecting the flows flowing in opposite directions to the interior of the same fiber.
  • This single fiber protected by a sheath 13, is engaged by its free end in a socket 14 until it enters an axial extension 14a of the latter housed in the brush 3.
  • the bottom of this extension 14a is occupied by a reflector 14b located at the wear threshold xy provided for the brush 3.
  • the light flux diffused by the emitter 6 is reflected at 14b and returns in the opposite direction through the fiber 35 to a usual coupler which transmits it to the receiver 7.
  • the reflector 14b is destroyed by wear, there is obviously no more reflection, so that the receiver 7 generates the alarm signal.

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  • Motor Or Generator Current Collectors (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Detection of the wear threshold is implemented, for each of the brushes (3), by means of an optical fibre system (5) combined with an emitter (6) and a receiver (7), in order to block off automatically the luminous flux when the wear reaches the extreme part of the fibre which is embedded in the brush. Several embodiments of the system (5) are described in detail. <IMAGE>

Description

La présente invention a trait aux contacts électriques du type à frottement, tels que les balais d'alimentation pour machines tournantes et les sabots ou patins de captage de courant pour rames de métro ou autres véhicules ferroviaires.The present invention relates to electrical contacts of the friction type, such as power brushes for rotating machines and shoes or current collection pads for subway trains or other rail vehicles.

On sait que ces contacts sont généralement réalisés en une matière conductrice relativement tendre (le plus souvant à base de graphite) afin d'assurer une bonne portée contre la partie métallique avec laquelle ils coopèrent, et d'éviter l'endommagement superficiel de celle-ci. Cette matière s'use en conséquence au fur et à mesure du fonctionnement de la machine électrique dont elle opère l'alimentation, de telle sorte qu'en vue d'éviter toute avarie intempestive, il y a lieu de prévoir des détecteurs propres à émettre un signal d'alarme lorsque l'usure atteint un certain seuil, nécessitant le remplacement du contact.It is known that these contacts are generally made of a relatively soft conductive material (most often based on graphite) in order to ensure good bearing against the metal part with which they cooperate, and to avoid surface damage to it. this. This material consequently wears out as the electric machine which it operates is operating, so that in order to avoid any untimely damage, it is necessary to provide detectors capable of emitting an alarm signal when wear reaches a certain threshold, requiring replacement of the contact.

Les dispositifs détecteurs habituellement utilisés sont à fonctionnement électrique, si bien que le même balai ou patin est simultanément associé à deux circuits électriques distincts, à savoir celui destiné à l'alimentation de la machine électrique à laquelle il est lié, et celui correspondant au signal d'alarme. Cette dualité de circuits au sein du même élément électrique présente évidemment des risques d'interférences.The detector devices usually used are electrically operated, so that the same brush or shoe is simultaneously associated with two separate electrical circuits, namely that intended for supplying the electric machine to which it is linked, and that corresponding to the signal. alarm. This duality of circuits within the same electrical element obviously presents risks of interference.

C'est à cet inconvénient qu'entend principalement remédier la présente invention, laquelle consiste essentiellement à assurer la détection du seuil d'usure à l'aide d'au moins une fibre optique qui est associée à un émetteur et à un récepteur de flux lumineux et dont une partie est insérée dans le contact jusqu'à une épaisseur correspondant au niveau du seuil d'usure, afin que par suite de la destruction consécutive à l'usure de la matière qui forme le contact, le flux lumineux soit occulté lorsque l'usure atteint le seuil précité.It is to this drawback that the present invention mainly intends to remedy, which consists essentially in ensuring the detection of the wear threshold using at least one optical fiber which is associated with a transmitter and with a flux receiver. luminous and a part of which is inserted into the contact up to a thickness corresponding to the level of the wear threshold, so that as a result of the destruction following the wear of the material which forms the contact, the luminous flux is obscured when wear reaches the aforementioned threshold.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Fig. 1 est une vue schématique illustrant l'application de l'invention aux deux balais opposés d'une machine tournante.
  • Fig. 2 est une coupe diamétrale à plus grande échelle montrant l'implantation de la fibre optique dans l'un des balais.
  • Fig. 3 reproduit fig. 1, les pièces étant représentées au moment où l'usure du balai atteint le seuil prévu.
  • Fig. 4 et 5 sont des coupes analogues à celle de fig. 2, .mais correspondant à deux variantes de mise en oeuvre de l'invention.
The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • Fig. 1 is a schematic view illustrating the application of the invention to the two opposite brushes of a rotary machine.
  • Fig. 2 is a diametral section on a larger scale showing the location of the optical fiber in one of the brushes.
  • Fig. 3 reproduced fig. 1, the parts being shown when the wear of the brush reaches the expected threshold.
  • Fig. 4 and 5 are sections similar to that of FIG. 2, .but corresponding to two variant embodiments of the invention.

En fig. 1, la référence 1 désigne la bague ou "collecteur" destiné à l'alimentation de l'induit 2 d'un moteur électrique ou autre machine tournante. Au collecteur 1 sont associés deux balais 3 opposés l'un à l'autre, chacun de ceux-ci étant relié à une source de courant électrique 4.In fig. 1, reference 1 designates the ring or "collector" intended for supplying the armature 2 of an electric motor or other rotary machine. Collector 1 is associated with two brushes 3 opposite one another, each of these being connected to a source of electric current 4.

Pour assurer le contrôle de l'usure progressive des balais 3 et obtenir de manière automatique un signal d'alarme lorsque cette usure atteint le seuil nécessitant le remplacement desdits balais, on prévoit, conformément à l'invention, deux systèmes de fibres optiques 5 dont une extrémité est associée à un émetteur lumineux schématisé en 6, tandis que l'extrémité opposée coopère avec un dispositif récepteur 7..La ou les fibres optiques qui composent chaque système détecteur 5 pénètrent à l'intérieur du balai 3 qui lui correspond, de façon à ce que le flux lumineux soit occulté lorsque l'usure atteint le seuil prévu, cette occultation provoquant, au niveau du récepteur 7, l'émission d'un signal sonore, lumineux ou autre, avertissant l'utilisateur de la nécessité de procéder au remplacement du balai 3 envisagé.To control progressive wear of the brushes 3 and automatically obtain an alarm signal when this wear reaches the threshold requiring the replacement of said brushes, provision is made, in accordance with the invention, two optical fiber systems 5, one end is associated with a light emitter shown diagrammatically at 6, while the opposite end cooperates with a receiving device 7. The optical fiber or fibers which make up each detector system 5 penetrate inside the brush 3 which corresponds to it, so that the luminous flux is obscured when the wear reaches the expected threshold, this occultation causing, at the level of the receiver 7, the emission of a sound, light or other signal, warning the user of the need to proceed the replacement of the brush 3 envisaged.

On comprend qu'un tel agencement évite tout risque d'interférence entre le circuit électrique d'alimentation correspondant à la source 4 et un autre circuit électrique d'alarme, du fait que suivant l'invention, le déclenchement de cette alarme est opéré par l'intermédiaire d'un simple flux lumineux.It is understood that such an arrangement avoids any risk of interference between the electrical supply circuit corresponding to the source 4 and another electrical alarm circuit, due to the fact that according to the invention, the triggering of this alarm is operated through a simple luminous flux.

Fig. 2 illustre de manière détaillée une forme de réalisation de l'un des deux systèmes de fibres optiques 5. Pour chaque système, on a recours à une fibre optique unique, référencée 15, qui au niveau du balai 3 auquel elle est associée est repliée sur elle-même à 180° afin de former une boucle. La partie repliée de la fibre 15, protégée par une gaine 8, pénètre dans une douille 9 dont elle est rendue solidaire par un scellement 10 ; cette douille 9 comporte un prolongement 9a à plus petit diamètre qui est introduit dans un logement borgne du corps du balai 3, le fond transversal 9b dudit prolongement se trouvant disposé à une profondeur légèrement supérieure à celle correspondant au seuil d'usure x-y prévu pour ledit balai. On observera que la gaine de protection 8 de la fibre 15 s'arrête préférablement au niveau du scellement 10 afin que les deux brins de la boucle de la fibre 15 soient maintenus l'un contre l'autre en présentant le plus faible encombrement possible.Fig. 2 illustrates in detail an embodiment of one of the two optical fiber systems 5. For each system, use is made of a single optical fiber, referenced 15, which at the level of the brush 3 with which it is associated is folded over. itself at 180 ° to form a loop. The folded part of the fiber 15, protected by a sheath 8, enters a socket 9 of which it is made integral by a seal 10; this sleeve 9 has an extension 9a with a smaller diameter which is introduced into a blind housing of the body of the brush 3, the transverse bottom 9b of said extension being disposed at a depth slightly greater than that corresponding to the wear threshold xy provided for said broom. It will be observed that the protective sheath 8 of the fiber 15 preferably stops at the level of the seal 10 so that the two strands of the loop of the fiber 15 are held against each other with the smallest possible footprint.

Bien évidemment, la boucle formée par la fibre 15 au niveau du fond du prolongement 9a n'affecte pas le passage du flux lumineux émis par l'émetteur 6, si bien que le récepteur 7 perçoit ce flux. Par contre et comme illustré en fig. 3, lorsque le corps du balai 3 est usé de manière telle que la réduction de son épaisseur atteint le seuil x-y, l'extrémité de la boucle de la fibre optique 15 est elle-même éliminée. Le flux lumineux est alors occulté, de telle sorte que le récepteur 7 émet de manière automatique le signal d'alarme.Obviously, the loop formed by the fiber 15 at the bottom of the extension 9a does not affect the passage of the light flux emitted by the emitter 6, so that the receiver 7 perceives this flux. On the other hand and as illustrated in fig. 3, when the body of the brush 3 is worn in such a way that the reduction in its thickness reaches the threshold x-y, the end of the loop of the optical fiber 15 is itself eliminated. The light flux is then obscured, so that the receiver 7 automatically transmits the alarm signal.

Dans la forme de réalisation suivant fig. 4, chaque système 5 comprend deux fibres optiques référencées 25 et 25', engagées parallèlement l'une à l'autre à l'intérieur d'une douille 11 introduite dans le balai 3, de la même manière qu'en fig. 2.In the embodiment according to fig. 4, each system 5 comprises two optical fibers referenced 25 and 25 ′, engaged parallel to one another inside a socket 11 introduced into the brush 3, in the same manner as in FIG. 2.

L'extrémité intérieure de cette douille est fermée par un réflecteur ou miroir 12 serti en bout de ladite douille, de façon à se trouver situé au niveau du seuil d'usure x- prévu.The inner end of this sleeve is closed by a reflector or mirror 12 crimped at the end of said sleeve, so as to be located at the level of the wear threshold x- provided.

Les extrémités des deux fibres optiques 25 et 25' s'arrêtent à une courte distance du réflecteur 12, de telle sorte que le flux lumineux qui est convoyé par celle 25 qui est liée à l'émetteur 6 est réfléchi et peut traverser la fibre 25' reliée au récepteur 7. Il va de soi que lorsque l'usure du balai 3 atteint le seuil x-y, le réflecteur 12 est détruit, ce qui a pour effet d'occulter le flux lumineux et d'engendrer le signal d'alarme.The ends of the two optical fibers 25 and 25 'stop a short distance from the reflector 12, so that the luminous flux which is conveyed by that 25 which is linked to the emitter 6 is reflected and can pass through the fiber 25 ′ connected to the receiver 7. It goes without saying that when the wear of the brush 3 reaches the threshold xy, the reflector 12 is destroyed, which has the effect of obscuring the luminous flux and generating the alarm signal.

Fig. 5 illustre une forme de réalisation de l'invention qui fait appel, pour chaque système 5, à une fibre optique unique référencée 35, du type bidirectionnel destiné à être associé à un coupleur optique apte à sélectionner les flux circulant en sens inverses à l'intérieur d'une même fibre. Cette fibre unique, protégée par une gaine 13, est engagée par son extrémité libre dans une douille 14 jusqu'à pénétrer dans un prolongement axial 14a de celle-ci logé dans le balai 3. Le fond de ce prolongement 14a est occupé par un réflecteur 14b situé au niveau du seuil d'usure x-y prévu pour le balai 3.Fig. 5 illustrates an embodiment of the invention which uses, for each system 5, a single optical fiber referenced 35, of the bidirectional type intended to be associated with an optical coupler capable of selecting the flows flowing in opposite directions to the interior of the same fiber. This single fiber, protected by a sheath 13, is engaged by its free end in a socket 14 until it enters an axial extension 14a of the latter housed in the brush 3. The bottom of this extension 14a is occupied by a reflector 14b located at the wear threshold xy provided for the brush 3.

Aussi longtemps que ce seuil n'est pas atteint, le flux lumineux diffusé par l'émetteur 6 est réfléchi en 14b et revient en sens inverse à travers la fibre 35 jusqu'à un coupleur usuel qui le transmet au récepteur 7. Par contre, lorsque le réflecteur 14b est détruit par l'usure, il n'y a évidemment plus de réflection, de telle sorte que le récepteur 7 engendre le signal d'alarme.As long as this threshold is not reached, the light flux diffused by the emitter 6 is reflected at 14b and returns in the opposite direction through the fiber 35 to a usual coupler which transmits it to the receiver 7. On the other hand, when the reflector 14b is destroyed by wear, there is obviously no more reflection, so that the receiver 7 generates the alarm signal.

Claims (4)

1. Dispositif pour la détection du seuil d'usure des contacts électriques à frottement tels que balais, patins ou similaires, du genre propre à émettre un signal d'alarme lorsque l'usure de la matière qui constitue le contact atteint une certaine limite, caractérisé en ce qu'il comprend au moins une fibre optique (15, 25 ou 35) qui est associée à un émetteur (6) et à un récepteur (7) de flux lumineux et dont une partie est insérée dans le corps du contact (3) jusqu'à une épaisseur correspondant au niveau du seuil d'usure (x-y), afin que par suite de la destruction consécutive à l'usure de la matière qui forme le contact, le flux lumineux soit occulté lorsque cette usure atteint ledit seuil.1. Device for detecting the wear threshold of electrical friction contacts such as brushes, pads or the like, of the kind capable of emitting an alarm signal when the wear of the material constituting the contact reaches a certain limit, characterized in that it comprises at least one optical fiber (15, 25 or 35) which is associated with a transmitter (6) and a receiver (7) of light flux and a part of which is inserted into the body of the contact ( 3) up to a thickness corresponding to the level of the wear threshold (xy), so that as a result of the destruction resulting from the wear of the material which forms the contact, the light flux is obscured when this wear reaches said threshold . 2. Dispositif suivant la revendication 1, caractérisé en ce que la partie de la fibre optique (15) introduite dans le corps du contact (3) est repliée à 180° pour former une boucle.2. Device according to claim 1, characterized in that the part of the optical fiber (15) introduced into the body of the contact (3) is folded at 180 ° to form a loop. 3. Dispositif suivant la revendication 1, caractérisé en ce que la partie de la fibre optique (25) qui est introduite dans le corps du contact (3) est sectionnée de façon à déterminer deux fibres parallèles (25, 25') qui se transmettent le flux lumineux par réflection à l'aide d'un miroir (12), lequel est disposé suivant le seuil (x-y).3. Device according to claim 1, characterized in that the part of the optical fiber (25) which is introduced into the body of the contact (3) is sectioned so as to determine two parallel fibers (25, 25 ') which are transmitted the luminous flux by reflection using a mirror (12), which is arranged according to the threshold (xy). 4. Dispositif suivant la revendication 1, caractérisé en ce que la partie de la fibre optique qui est introduite dans le corps du contact (3) est formée par l'extrémité d'une fibre bidirection- nelle (35) associée d'une part à un réflecteur (14b) qui assure le retour du flux lumineux au niveau du seuil d'usure (x-y), d'autre part à un coupleur de type usuel apte à sélectionner le flux de retour.4. Device according to Claim 1, characterized in that the portion of the optical fiber which is inserted into the contact body (3) is formed by the end of a fiber bidirection - nelle (35) associated on the one hand to a reflector (14b) which ensures the return of the light flux at the wear threshold (xy), on the other hand to a usual type coupler capable of selecting the return flux.
EP87420003A 1986-01-06 1987-01-06 Detection device for wear threshold of friction-type electrical contacts Withdrawn EP0232209A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8600191 1986-01-06
FR8600191A FR2592744B1 (en) 1986-01-06 1986-01-06 DEVICE FOR DETECTING THE WEAR THRESHOLD OF ELECTRICAL CONTACTS OF THE FRICTION TYPE

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EP0232209A1 true EP0232209A1 (en) 1987-08-12

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988003721A1 (en) * 1986-11-11 1988-05-19 Morganite Electrical Carbon Limited Condition indicator system for wearable elements
DE4111206A1 (en) * 1991-04-06 1992-10-08 Schunk Kohlenstofftechnik Gmbh COAL BRUSH
GB2264168A (en) * 1992-01-28 1993-08-18 Bmt Defence Services Limited Fibre-optic device for measuring wear in bearings
EP0624937A1 (en) * 1993-05-11 1994-11-17 Schunk Kohlenstofftechnik GmbH Carbon brush and process for fixing and mounting a conducting cord thread therein
EP0920092A2 (en) * 1997-10-28 1999-06-02 Reliance Electric Industrial Company Apparatus, system and method for determining wear of an article
EP1403613A1 (en) * 2002-09-25 2004-03-31 Rockwell Automation Technologies, Inc. System for monitoring substrate conditions
US6950193B1 (en) 1997-10-28 2005-09-27 Rockwell Automation Technologies, Inc. System for monitoring substrate conditions
US7551288B1 (en) 1997-10-28 2009-06-23 Rockwell Automation Technologies, Inc. System for monitoring bearing wear
GB2489577A (en) * 2011-03-29 2012-10-03 Gen Electric Brush wear detector system with wireless sensor

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DE1804290A1 (en) * 1968-10-21 1970-05-06 Bahlsen Werner Protective device on commutators to prevent excessive brush wear
GB2011610A (en) * 1977-12-23 1979-07-11 Elliot Bros Ltd Fibre optic terminal
JPS587102A (en) * 1981-07-04 1983-01-14 Akiko Mizuno Optical coupler
JPS5849067A (en) * 1981-09-16 1983-03-23 Hitachi Ltd Detector for brush wearing amount
JPS5939084A (en) * 1982-08-27 1984-03-03 Fujitsu Ltd Mounting structure for optical integrated circuit

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DE1804290A1 (en) * 1968-10-21 1970-05-06 Bahlsen Werner Protective device on commutators to prevent excessive brush wear
GB2011610A (en) * 1977-12-23 1979-07-11 Elliot Bros Ltd Fibre optic terminal
JPS587102A (en) * 1981-07-04 1983-01-14 Akiko Mizuno Optical coupler
JPS5849067A (en) * 1981-09-16 1983-03-23 Hitachi Ltd Detector for brush wearing amount
JPS5939084A (en) * 1982-08-27 1984-03-03 Fujitsu Ltd Mounting structure for optical integrated circuit

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Title
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269307A1 (en) * 1986-11-11 1988-06-01 Morganite Electrical Carbon Limited Condition indicator system for wearable elements
WO1988003721A1 (en) * 1986-11-11 1988-05-19 Morganite Electrical Carbon Limited Condition indicator system for wearable elements
DE4111206A1 (en) * 1991-04-06 1992-10-08 Schunk Kohlenstofftechnik Gmbh COAL BRUSH
EP0512234A2 (en) 1991-04-06 1992-11-11 Schunk Kohlenstofftechnik GmbH Carbon brush
GB2264168B (en) * 1992-01-28 1995-07-19 Bmt Defence Services Limited Device for measuring wear in bearings
GB2264168A (en) * 1992-01-28 1993-08-18 Bmt Defence Services Limited Fibre-optic device for measuring wear in bearings
US5488261A (en) * 1993-05-11 1996-01-30 Schunk Kohlenstofftechnik Gmbh Carbon brush and fastening a braided indicator wire therein
DE4315622A1 (en) * 1993-05-11 1994-11-17 Schunk Kohlenstofftechnik Gmbh Carbon brush and method for arranging and attaching a signal wire in such
EP0624937A1 (en) * 1993-05-11 1994-11-17 Schunk Kohlenstofftechnik GmbH Carbon brush and process for fixing and mounting a conducting cord thread therein
EP0920092A2 (en) * 1997-10-28 1999-06-02 Reliance Electric Industrial Company Apparatus, system and method for determining wear of an article
EP0920092A3 (en) * 1997-10-28 2002-11-13 Reliance Electric Industrial Company Apparatus, system and method for determining wear of an article
US6950193B1 (en) 1997-10-28 2005-09-27 Rockwell Automation Technologies, Inc. System for monitoring substrate conditions
US7551288B1 (en) 1997-10-28 2009-06-23 Rockwell Automation Technologies, Inc. System for monitoring bearing wear
EP1403613A1 (en) * 2002-09-25 2004-03-31 Rockwell Automation Technologies, Inc. System for monitoring substrate conditions
GB2489577A (en) * 2011-03-29 2012-10-03 Gen Electric Brush wear detector system with wireless sensor
US8384266B2 (en) 2011-03-29 2013-02-26 General Electric Company Brush wear detector system with wireless sensor

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FR2592744B1 (en) 1988-10-07
FR2592744A1 (en) 1987-07-10

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