EP0662736A1 - Rotating electrical slipring with multiwire brushes - Google Patents

Rotating electrical slipring with multiwire brushes Download PDF

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Publication number
EP0662736A1
EP0662736A1 EP94400681A EP94400681A EP0662736A1 EP 0662736 A1 EP0662736 A1 EP 0662736A1 EP 94400681 A EP94400681 A EP 94400681A EP 94400681 A EP94400681 A EP 94400681A EP 0662736 A1 EP0662736 A1 EP 0662736A1
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EP
European Patent Office
Prior art keywords
brushes
strands
electrical collector
strand
rotary electrical
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
EP94400681A
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German (de)
French (fr)
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EP0662736B1 (en
Inventor
Bernard Blanchard
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.)
Everaxis Aerospace and Defence SAS
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Air Precision SA
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Publication date
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Publication of EP0662736A1 publication Critical patent/EP0662736A1/en
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Publication of EP0662736B1 publication Critical patent/EP0662736B1/en
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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
    • H01R39/64—Devices for uninterrupted 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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres

Definitions

  • the invention relates to a rotating electrical collector comprising one or more slip rings and at least one multi-strand brush slidingly resting against each slip ring, so as to allow the transmission of one or more electrical signals between two pieces capable of being driven by 'a relative rotational movement.
  • Rotating electrical collectors are devices which transmit one or more electrical signals between a fixed part or stator, and a mobile part or rotor. Such devices are used in many industrial sectors, among which, by way of example only, are machine tools, air, naval and land transport, radars, etc.
  • the rotor of a rotating electrical collector comprises a number of electrically conductive rings equal to the number of electrical signals which the device must transmit. These electrically conductive rings are arranged on an electrically insulating axis and separated from each other by an electrically insulating material.
  • the stator of the rotary electrical collectors generally comprises, opposite each of the electrically conductive rings, at least two brushes each, most often made up of a single electrically conductive strand rubbing permanently on the corresponding ring. Grooves can be machined on the electrically conductive rings to guide the brushes.
  • the subject of the invention is precisely a rotary electrical collector, the brushes of which have an original design making it possible to significantly reduce the electrical noise due to vibration, compared to the single-strand brushes, while allowing a lifetime and linear speeds greater than those permitted. with one-piece brushes, without risk of creating short-circuits as a result of breakage of the brush strands, and whatever the diameter of the slip rings, that is to say in particular for very small collectors used in gyroscopic applications.
  • this result is obtained by means of an electric collector rotating with multi-strand brushes, able to be placed between two parts capable of being driven in a relative rotational movement, this collector comprising at least one slip ring. made of an electrically conductive material and carried by a first of said parts and at least one multi-strand brush made of an electrically conductive material and carried by the second part so as to be in lateral sliding support against the slip ring, according to a pressing force determined, characterized in that each multi-strand brush includes a bundle of two to five strands juxtaposed, received in an annular groove of the slip ring so that each of them is simultaneously in contact with this groove ge.
  • multi-strand brushes having a limited number of strands arranged so as to be all in contact with the annular groove of the slip ring makes it possible to significantly reduce the variations in dynamic electrical resistance to the contact surfaces, in particular by providing self-damping. vibrations. This results in a significant reduction in the electrical noise generated in the collector as well as a marked improvement in the service life and in the linear speeds likely to be achieved, compared to the collectors with single-strand brushes.
  • limiting the number of strands constituting each brush to a very low number allows these strands to be given a sufficient diameter to avoid any risk of breakage liable to produce unacceptable short circuits in the collector.
  • each multi-strand brush includes three juxtaposed strands.
  • each multi-strand brush further comprises a base comprising a receptacle in which is received one end of the bundle and a rod for adjusting the pressing force, carrying the receptacle and capable of being fixed to a terminal block of the second part.
  • This rod is advantageously a straight rod bent to form an angle which determines the pressing force.
  • the strands are welded into a blind hole in the receptacle.
  • the annular groove in which each brush is received has either a V-shaped section or a U-shaped section.
  • two brushes are preferably in sliding lateral support, in opposite directions, in each of the annular grooves.
  • the rotary electrical collector illustrated diagrammatically in FIG. 1 comprises a rotor 10 and a stator 12.
  • the rotor 10 mainly comprises an axis 14, made of an electrically insulating material, on which are mounted slip rings 16, made of an electrically conductive material. These slip rings 16 are separated from each other by electrically insulating rings 18.
  • the number of rings 16 and 18 can be arbitrary and essentially depends on the number of signals to be transmitted through the collector.
  • Electrical conductors 20 run inside the axis 14, so as to connect each of the slip rings 16 to systems capable of receiving or emitting the electrical signals traveling through the rings.
  • the axis 14 of the rotor 10 is supported by two flanges 22 of the stator 12, by means of two bearings 24.
  • the stator 12 of the rotary electrical collector further comprises a tubular part 26 which connects the two flanges 22 coaxially to the axis 14, around the slip rings 16 and the insulating rings 18.
  • the tubular part 26 carries a terminal block 27 in one electrically insulating material, supporting conductive strips.
  • This terminal block 27 supports, in a plane radially cutting each of the slip rings 16, two multi-strand brushes 28 which are arranged so as to be in sliding lateral support, in opposite directions, on the corresponding slip ring 16. More specifically, each pair of brushes 28 is supported in a guide groove 30 of the corresponding collector ring 16, this groove 30 advantageously having a V-shaped section (FIG. 3) or a U-shaped section (FIG. 4).
  • the two brushes 28 of the same pair are fixed on the terminal block 27 in two neighboring locations, so that the brushes 28 are arranged symmetrically with respect to a plane passing through the geometric axis of the axis 14.
  • each of the multi-strand brushes 28 comprises a bundle of n juxtaposed strands, n being able to vary between 2 and 5 and being advantageously equal to 3, as illustrated in the figures.
  • the strands 32 are all identical and they are made of an electrically conductive material, mechanically resistant and having good elasticity. This material can in particular consist of a metallic alloy such as a gold-based alloy.
  • each of the strands 32 of the brush 28 is advantageously between 0.15 mm and 0.25 mm. This dimension avoids any risk of breakage and, consequently, of short-circuit inside the collector, without significantly increasing the size of the brushes.
  • Each of the multi-strand brushes 28 further comprises a base 34 by which the strands 32 are mounted on the terminal block 27 of the stator.
  • This base 34 is made of an electrically conductive material such as brass.
  • a first end of the bundle formed by the strands 32 is embedded in a blind hole formed in a tubular receptacle 36 constituting a part of the base 34.
  • the base 34 further comprises a rod 38 which is aligned with the strands 32 when these the latter are embedded in receptacle 36.
  • the three strands 32 of each of the brushes are embedded in the blind hole of the receptacle 36 and they are welded to it by solder 40.
  • This solder 40 can be produced electrically.
  • the strands 32 are then rectilinear and aligned with the rod 38 as shown in solid lines in FIG. 2.
  • the rod 38 is introduced into a bore 40, of defined depth, formed in an electrically conductive contact carried by the terminal block 27.
  • the final fixing is ensured by welding as in the case of 'represented in 42.
  • the rod 38 is bent at a determined angle, in a plane perpendicular to the geometric axis of the axis 14, as shown in broken lines in FIG. 2. This angle is such that, when the rotor is in place, the strands 32 of the brush 28 are in lateral support sliding in the groove 30 of the corresponding ring 16 , by undergoing a certain outward bending which determines the bearing force.
  • the groove 30 with a V-shaped section has been replaced by a groove with a U-shaped section.
  • This characteristic makes it possible in particular to improve the distribution between the strands 32 of the loads due to the bearing force with which the brush is applied against the groove, while preserving the guiding effect provided by this groove.
  • each of the brushes 28 constitutes the best compromise, it is however possible to envisage using only two strands, in particular in the case of a groove with a U-shaped section, or on the contrary of use four to five strands. In the latter case, it is however desirable to ensure that the strands are fixed to the stator in such a way that each of the strands is in direct contact with the groove 30 machined on the slip ring 16.

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  • Motor Or Generator Current Collectors (AREA)

Abstract

The electrical collector for a rotating machine includes a ring of conducting material (16) formed about the rotating part. a multi-fibre brush (28) comprises a bundle of two to five, and preferably three fibres in a group. These are supported in a ferrule (36) at one end, whilst their free ends run in a groove in the conducting ring (16). The ferrule end is embedded in a support (27) which allows a certain amount of bending of the assembly. The extent to which the assembly is bent determines the pressure applied by the brushes to the ring.

Description

L'invention concerne un collecteur électrique tournant comportant une ou plusieurs bagues collectrices et au moins un balai multibrin en appui latéral glissant contre chaque bague collectrice, de façon à permettre la transmission d'un ou plusieurs signaux électriques entre deux pièces aptes à être animées d'un mouvement de rotation relative.The invention relates to a rotating electrical collector comprising one or more slip rings and at least one multi-strand brush slidingly resting against each slip ring, so as to allow the transmission of one or more electrical signals between two pieces capable of being driven by 'a relative rotational movement.

Les collecteurs électriques tournants sont des dispositifs qui permettent de transmettre un ou plusieurs signaux électriques entre une partie fixe ou stator, et une partie mobile ou rotor. De tels dispositifs sont utilisés dans de nombreux secteurs industriels parmi lesquels on citera, uniquement à titre d'exemples, les machines outils, les transports aériens, navals et terrestres, les radars, etc..Rotating electrical collectors are devices which transmit one or more electrical signals between a fixed part or stator, and a mobile part or rotor. Such devices are used in many industrial sectors, among which, by way of example only, are machine tools, air, naval and land transport, radars, etc.

Le rotor d'un collecteur électrique tournant comprend un nombre de bagues électriquement conductrices égal au nombre de signaux électriques que doit transmettre le dispositif. Ces bagues électriquement conductrices sont disposées sur un axe électriquement isolant et séparées les unes des autres par un matériau électriquement isolant.The rotor of a rotating electrical collector comprises a number of electrically conductive rings equal to the number of electrical signals which the device must transmit. These electrically conductive rings are arranged on an electrically insulating axis and separated from each other by an electrically insulating material.

Le stator des collecteurs électriques tournants comprend généralement, en face de chacune des bagues électriquement conductrices, au moins deux balais constitués chacun, le plus souvent, par un brin unique électriquement conducteur frottant en permanence sur la bague correspondante. Des gorges peuvent être usinées sur les bagues électriquement conductrices pour assurer le guidage des balais.The stator of the rotary electrical collectors generally comprises, opposite each of the electrically conductive rings, at least two brushes each, most often made up of a single electrically conductive strand rubbing permanently on the corresponding ring. Grooves can be machined on the electrically conductive rings to guide the brushes.

Lorsque les balais des collecteurs électriques tournants sont des balais monobrins, comme c'est habituellement le cas, les vibrations qui se produisent inévitablement lors du fonctionnement entraînent des variations dans le temps des surfaces de contact entre les balais et les bagues collectrices pouvant aller jusqu'à de brèves pertes de contact. Ces variations des surfaces de contact et ces brèves pertes de contact ont pour conséquence des variations sensibles de la résistance électrique dynamique dans les zones de contact glissants des collecteurs.When the brushes of the rotating electrical collectors are single-strand brushes, as is usually the case, the vibrations which inevitably occur during operation cause variations over time in the contact surfaces between the brushes and the slip rings which can go up to brief loss of contact. These variations in contact surfaces and these brief contact losses result in significant variations in dynamic electrical resistance in the sliding contact zones of the collectors.

Cela se traduit tout d'abord par l'apparition de bruits dans les signaux électriques transmis pas ces collecteurs.This is reflected first of all by the appearance of noise in the electrical signals transmitted by these collectors.

Cela se traduit aussi par une accélération de l'usure des balais, à la fois pour des raisons mécaniques et du fait de l'échauffement qui se produit par effet Joule lors de l'accroissement de la résistance électrique dynamique entraînée par les pertes de contact.This also results in an acceleration of the wear of the brushes, both for mechanical reasons and because of the heating which occurs by Joule effect during the increase of the dynamic electrical resistance brought about by the losses of contact. .

Ces phénomènes sont d'autant plus sensibles que la vitesse de déplacement linéaire relative entre les bagues collectrices et les balais du collecteur est élevée.These phenomena are all the more sensitive as the speed of relative linear movement between the slip rings and the brushes of the collector is high.

En résumé, les collecteurs électriques tournants à balais monobrins ont donc pour principaux inconvénients l'introduction de bruits électriques dans les signaux qu'ils transmettent, une durée de vie parfois insuffisante et une vitesse linéaire relative entre les bagues collectrices et les balais qui ne peut excéder certaines limites.In summary, the main drawbacks of rotary electrical collectors with single-wire brushes therefore have the introduction of electrical noise into the signals they transmit, a sometimes insufficient service life and a relative linear speed between the slip rings and the brushes which cannot exceed certain limits.

Comme l'indique notamment le document FR-A-2 469 813, il est connu de doter un collecteur électrique tournant de balais multibrins. Plus précisément, ce document propose de réaliser les balais d'un collecteur électrique tournant sous la forme d'un faisceau de brins constitué par l'assemblage d'un grand nombre de fils métalliques de très faible diamètre (10 um à 300 um).As indicated in particular in document FR-A-2 469 813, it is known to provide a rotating electrical collector with multi-strand brushes. More specifically, this document proposes making the brushes of an electrical collector rotating in the form of a bundle of strands constituted by the assembly of a large number of metallic wires of very small diameter (10 μm to 300 μm).

Dans un agencement de ce type, compte tenu du grand nombre de brins et de leur très faible diamètre, il se produit rapidement une usure qui conduit à la cassure de certains des brins. Il existe alors de forts risques de courts-circuits, ce qui constitue un inconvénient rédhibitoire rendant cette solution inacceptable dans la grande majorité des cas.In an arrangement of this type, given the large number of strands and their very small diameter, wear quickly occurs which leads to breakage of some of the strands. There are then high risks of short circuits, which constitutes a crippling drawback making this solution unacceptable in the vast majority of cases.

De plus, la majorité des brins du faisceau formant un balai n'est pas directement en contact avec la bague collectrice. Par conséquent, la transmission des signaux électriques s'effectue de brins en brins jusqu'à la bague collectrice, ce qui n'est pas satisfaisant du point de vue de la variation de la résistance de contact.In addition, the majority of the strands of the bundle forming a brush is not directly in contact with the slip ring. Consequently, the transmission of the electrical signals takes place from strand to strand up to the slip ring, which is not satisfactory from the point of view of the variation in contact resistance.

L'invention a précisément pour objet un collecteur électrique tournant dont les balais présentent une conception originale permettant de diminuer sensiblement les bruits électriques dus aux vibrations, par rapport aux balais monobrins, tout en autorisant une durée de vie et des vitesses linéaires supérieures à celles permises avec les balais monobrins, sans risque de création de courts-circuits par suite de cassures des brins du balai, et quel que soit le diamètre des bagues collectrices, c'est-à-dire notamment pour des collecteurs de très petites dimensions utilisés dans des applications gyroscopiques.The subject of the invention is precisely a rotary electrical collector, the brushes of which have an original design making it possible to significantly reduce the electrical noise due to vibration, compared to the single-strand brushes, while allowing a lifetime and linear speeds greater than those permitted. with one-piece brushes, without risk of creating short-circuits as a result of breakage of the brush strands, and whatever the diameter of the slip rings, that is to say in particular for very small collectors used in gyroscopic applications.

Conformément à l'invention, ce résultat est obtenu au moyen d'un collecteur électrique tournant à balais multibrins, apte à être placé entre deux pièces susceptibles d'être animées d'un mouvement de rotation relative, ce collecteur comprenant au moins une bague collectrice réalisée en un matériau électriquement conducteur et portée par une première desdites pièces et au moins un balai multibrin réalisé en un matériau électriquement conducteur et porté par la deuxième pièce de façon à être en appui latéral glissant contre la bague collectrice, selon une force d'appui déterminée, caractérisé par le fait que chaque balai multibrin comprend un faisceau de deux à cinq brins juxtaposés, reçu dans une gorge annulaire de la bague collectrice de façon telle que chacun d'entre eux soit simultanément en contact avec cette gorge.According to the invention, this result is obtained by means of an electric collector rotating with multi-strand brushes, able to be placed between two parts capable of being driven in a relative rotational movement, this collector comprising at least one slip ring. made of an electrically conductive material and carried by a first of said parts and at least one multi-strand brush made of an electrically conductive material and carried by the second part so as to be in lateral sliding support against the slip ring, according to a pressing force determined, characterized in that each multi-strand brush includes a bundle of two to five strands juxtaposed, received in an annular groove of the slip ring so that each of them is simultaneously in contact with this groove ge.

L'utilisation de balais multibrins présentant un nombre limité de brins disposés de façon à être tous en contact avec la gorge annulaire de la bague collectrice permet de diminuer sensiblement les variations de résistance électrique dynamique aux surfaces de contact, notamment en procurant un auto- amortissement des vibrations. Il en découle une diminution sensible des bruits électriques engendrés dans le collecteur ainsi qu'une nette amélioration de la durée de vie et des vitesses linéaires susceptibles d'être atteintes, par rapport aux collecteurs à balais monobrins.The use of multi-strand brushes having a limited number of strands arranged so as to be all in contact with the annular groove of the slip ring makes it possible to significantly reduce the variations in dynamic electrical resistance to the contact surfaces, in particular by providing self-damping. vibrations. This results in a significant reduction in the electrical noise generated in the collector as well as a marked improvement in the service life and in the linear speeds likely to be achieved, compared to the collectors with single-strand brushes.

De plus, la limitation du nombre de brins constituant chaque balai à un nombre très faible permet de donner à ces brins un diamètre suffisant pour éviter tout risque de rupture susceptible de produire des courts-circuits inacceptables dans le collecteur.In addition, limiting the number of strands constituting each brush to a very low number allows these strands to be given a sufficient diameter to avoid any risk of breakage liable to produce unacceptable short circuits in the collector.

La forme de réalisation présentant le compromis le plus satisfaisant correspond au cas où chaque balai multibrin comprend trois brins juxtaposés.The embodiment with the most satisfactory compromise corresponds to the case where each multi-strand brush includes three juxtaposed strands.

De préférence, chaque balai multibrin comprend de plus une embase comportant un réceptacle dans lequel est reçue une extrémité du faisceau et une tige de réglage de la force d'appui, portant le réceptacle et apte à être fixée sur un bornier de la deuxième pièce.Preferably, each multi-strand brush further comprises a base comprising a receptacle in which is received one end of the bundle and a rod for adjusting the pressing force, carrying the receptacle and capable of being fixed to a terminal block of the second part.

Cette tige est avantageusement une tige rectiligne pliée pour former un angle qui détermine la force d'appui.This rod is advantageously a straight rod bent to form an angle which determines the pressing force.

Dans une forme de réalisation préférentielle de l'invention, les brins sont soudés dans un trou borgne du réceptacle.In a preferred embodiment of the invention, the strands are welded into a blind hole in the receptacle.

Selon le cas, la gorge annulaire dans laquelle est reçue chaque balai présente soit une section en forme de V, soit une section en forme de U.Depending on the case, the annular groove in which each brush is received has either a V-shaped section or a U-shaped section.

D'une manière en elle-même connue, deux balais sont de préférence en appui latéral glissant, en sens opposé, dans chacune des gorges annulaires.In a manner known per se, two brushes are preferably in sliding lateral support, in opposite directions, in each of the annular grooves.

On décrira à présent, à titre d'exemple non limitatif, une forme de réalisation préférentielle de l'invention, en se référant aux dessins annexés, dans lesquels :

  • - la figure 1 est une vue en perspective, avec arrachement partiel, représentant un collecteur électrique tournant réalisé conformément à l'invention ;
  • - la figure 2 est une vue en coupe transversale du collecteur de la figure 1, passant par l'axe de l'un des balais de ce collecteur ;
  • - la figure 3 est une section selon la ligne III-III de la figure 2 ; et
  • - la figure 4 est une section analogue à celle de la figure 3 illustrant une variante de réalisation de l'invention.
A preferred embodiment of the invention will now be described, by way of nonlimiting example, with reference to the appended drawings, in which:
  • - Figure 1 is a perspective view, partially broken away, showing a rotating electrical collector produced according to the invention;
  • - Figure 2 is a cross-sectional view of the collector of Figure 1, passing through the axis of one of the brushes of this collector;
  • - Figure 3 is a section along line III-III of Figure 2; and
  • - Figure 4 is a section similar to that of Figure 3 illustrating an alternative embodiment of the invention.

Le collecteur électrique tournant illustré schématiquement sur la figure 1 comprend un rotor 10 et un stator 12.The rotary electrical collector illustrated diagrammatically in FIG. 1 comprises a rotor 10 and a stator 12.

Le rotor 10 comprend principalement un axe 14, réalisé en un matériau électriquement isolant, sur lequel sont montées des bagues collectrices 16, réalisées en un matériau électriquement conducteur. Ces bagues collectrices 16 sont séparées les unes des autres par des bagues électriquement isolantes 18. Le nombre des bagues 16 et 18 peut être quelconque et dépend essentiellement du nombre de signaux à transmettre au travers du collecteur.The rotor 10 mainly comprises an axis 14, made of an electrically insulating material, on which are mounted slip rings 16, made of an electrically conductive material. These slip rings 16 are separated from each other by electrically insulating rings 18. The number of rings 16 and 18 can be arbitrary and essentially depends on the number of signals to be transmitted through the collector.

Des conducteurs électriques 20 cheminent à l'intérieur de l'axe 14, de façon à relier chacune des bagues collectrices 16 à des systèmes susceptibles de recevoir ou d'émettre les signaux électriques cheminant par les bagues.Electrical conductors 20 run inside the axis 14, so as to connect each of the slip rings 16 to systems capable of receiving or emitting the electrical signals traveling through the rings.

L'axe 14 du rotor 10 est supporté par deux flasques 22 du stator 12, par l'intermédiaire de deux paliers 24.The axis 14 of the rotor 10 is supported by two flanges 22 of the stator 12, by means of two bearings 24.

Le stator 12 du collecteur électrique tournant comprend de plus une pièce tubulaire 26 qui relie entre eux les deux flasques 22 coaxialement à l'axe 14, autour des bagues collectrices 16 et des bagues isolantes 18. La pièce tubulaire 26 porte un bornier 27 en un matériau électriquement isolant, supportant des lames conductrices.The stator 12 of the rotary electrical collector further comprises a tubular part 26 which connects the two flanges 22 coaxially to the axis 14, around the slip rings 16 and the insulating rings 18. The tubular part 26 carries a terminal block 27 in one electrically insulating material, supporting conductive strips.

Ce bornier 27 supporte, dans un plan coupant radialement chacune des bagues collectrices 16, deux balais multibrins 28 qui sont disposés de façon à être en appui latéral glissant, en sens opposé, sur la bague collectrice 16 correspondante. Plus précisément, chaque paire de balais 28 prend appui dans une gorge de guidage 30 de la bague collectrice 16 correspondante, cette gorge 30 présentant avantageusement une section en forme de V (figure 3) ou de U (figure 4). La fixation des deux balais 28 d'une même paire sur le bornier 27 est effectuée en deux emplacements voisins, de telle sorte que les balais 28 soient disposés symétriquement par rapport à un plan passant par l'axe géométrique de l'axe 14.This terminal block 27 supports, in a plane radially cutting each of the slip rings 16, two multi-strand brushes 28 which are arranged so as to be in sliding lateral support, in opposite directions, on the corresponding slip ring 16. More specifically, each pair of brushes 28 is supported in a guide groove 30 of the corresponding collector ring 16, this groove 30 advantageously having a V-shaped section (FIG. 3) or a U-shaped section (FIG. 4). The two brushes 28 of the same pair are fixed on the terminal block 27 in two neighboring locations, so that the brushes 28 are arranged symmetrically with respect to a plane passing through the geometric axis of the axis 14.

La réalisation individuelle de chacun des balais multibrins 28 va à présent être décrite en détail en se référant aux figures 2 et 3.The individual embodiment of each of the multi-strand brushes 28 will now be described in detail with reference to FIGS. 2 and 3.

Conformément à l'invention, chacun des balais multibrins 28 comprend un faisceau de n brins juxtaposés, n pouvant varier entre 2 et 5 et étant avantageusement égal à 3, comme l'illustrent les figures. Les brins 32 sont tous identiques et ils sont réalisés en un matériau électriquement conducteur, mécaniquement résistant et présentant une bonne élasticité. Ce matériau peut notamment être constitué par un alliage métallique tel qu'un alliage à base d'or.According to the invention, each of the multi-strand brushes 28 comprises a bundle of n juxtaposed strands, n being able to vary between 2 and 5 and being advantageously equal to 3, as illustrated in the figures. The strands 32 are all identical and they are made of an electrically conductive material, mechanically resistant and having good elasticity. This material can in particular consist of a metallic alloy such as a gold-based alloy.

Le diamètre de chacun des brins 32 du balai 28 est avantageusement compris entre 0,15 mm et 0,25 mm. Cette dimension évite tout risque de cassure et, par conséquent, de court-circuit à l'intérieur du collecteur, sans pour autant accroître de façon sensible l'encombrement des balais.The diameter of each of the strands 32 of the brush 28 is advantageously between 0.15 mm and 0.25 mm. This dimension avoids any risk of breakage and, consequently, of short-circuit inside the collector, without significantly increasing the size of the brushes.

Chacun des balais multibrins 28 comprend de plus une embase 34 par laquelle les brins 32 sont montés sur le bornier 27 du stator. Cette embase 34 est réalisée en un matériau électriquement conducteur tel que du laiton. Une première extrémité du faisceau formé par les brins 32 est encastrée dans un trou borgne formé dans un réceptacle tubulaire 36 constituant une partie de l'embase 34. L'embase 34 comprend de plus une tige 38 qui est alignée avec les brins 32 lorsque ces derniers sont encastrés dans le réceptacle 36.Each of the multi-strand brushes 28 further comprises a base 34 by which the strands 32 are mounted on the terminal block 27 of the stator. This base 34 is made of an electrically conductive material such as brass. A first end of the bundle formed by the strands 32 is embedded in a blind hole formed in a tubular receptacle 36 constituting a part of the base 34. The base 34 further comprises a rod 38 which is aligned with the strands 32 when these the latter are embedded in receptacle 36.

Lors de la fabrication des balais 28, les trois brins 32 de chacun des balais sont encastrés dans le trou borgne du réceptacle 36 et ils y sont soudés par de la soudure 40. Cette soudure 40 peut être réalisée électriquement. Les brins 32 sont alors rectilignes et alignés avec la tige 38 comme on l'a représenté en trait plein sur la figure 2.During the manufacture of the brushes 28, the three strands 32 of each of the brushes are embedded in the blind hole of the receptacle 36 and they are welded to it by solder 40. This solder 40 can be produced electrically. The strands 32 are then rectilinear and aligned with the rod 38 as shown in solid lines in FIG. 2.

Lorsque le balai 28 est fixé sur le bornier 27 du stator 12, la tige 38 est introduite dans un perçage 40, de profondeur définie, formé dans un contact électriquement conducteur porté par le bornier 27. La fixation définitive est assurée par soudage comme on l'a représenté en 42.When the brush 28 is fixed to the terminal block 27 of the stator 12, the rod 38 is introduced into a bore 40, of defined depth, formed in an electrically conductive contact carried by the terminal block 27. The final fixing is ensured by welding as in the case of 'represented in 42.

Afin que les brins 32 du balai 28 appuient ensuite avec une force d'appui prédéterminée contre la gorge 30 de la bague collectrice 16 correspondante, la tige 38 est pliée selon un angle déterminé, dans un plan perpendiculaire à l'axe géométrique de l'axe 14, comme on l'a représenté en traits mixtes sur la figure 2. Cet angle est tel que, lorsque le rotor est en place, les brins 32 du balai 28 sont en appui latéral glissant dans la gorge 30 de la bague 16 correspondante, en subissant une certaine flexion vers l'extérieur qui détermine la force d'appui.So that the strands 32 of the brush 28 then press with a predetermined pressing force against the groove 30 of the corresponding slip ring 16, the rod 38 is bent at a determined angle, in a plane perpendicular to the geometric axis of the axis 14, as shown in broken lines in FIG. 2. This angle is such that, when the rotor is in place, the strands 32 of the brush 28 are in lateral support sliding in the groove 30 of the corresponding ring 16 , by undergoing a certain outward bending which determines the bearing force.

Comme on l'a représenté sur la figure 3, lorsque la gorge 30 présente en section la forme d'un V, l'un des brins 32 du balai 28 prend appui dans le fond de la gorge alors que les deux autres brins 32 prennent appui à la fois sur les flancs de la gorge et sur le premier brin.As shown in Figure 3, when the groove 30 has a V-shaped section, one of the strands 32 of the brush 28 is supported in the bottom of the groove while the other two strands 32 take support both on the sides of the throat and on the first strand.

Les tests effectués à l'aide de balais réalisés de cette manière ont permis de montrer que les vibrations de chacun des brins 32 du balai sont auto-amortis par les autres brins, de telle sorte que les variations relatives des surfaces de contact entre les balais et les bagues collectrices sont sensiblement réduites par rapport à un collecteur équipé de balais monobrins. De plus, étant donné que chacun des brins 32 du balai est en contact directement avec la bague collectrice 16, les surfaces de contact sont accrues. En outre, la force d'appui élémentaire est réduite et répartie.The tests carried out using brushes made in this way made it possible to show that the vibrations of each of the strands 32 of the brush are self-absorbed by the other strands, so that the relative variations in the contact surfaces between the brushes and the slip rings are significantly reduced compared to a collector equipped with single-strand brushes. In addition, since each of the strands 32 of the brush is in direct contact with the slip ring 16, the contact surfaces are increased. In addition, the elementary support force is reduced and distributed.

Ces changements de caractéristiques ont pour conséquences des diminutions sensibles des bruits électriques, de la résistance de contact, de l'échauffement par effet Joule et de l'usure mécanique dues à une force d'appui élémentaire réduite et répartie. Cela se traduit concrètement par une augmentation notable de la durée de vie par rapport aux collecteurs électriques tournants à balais monobrins ainsi que la possibilité d'atteindre des vitesses de déplacement linéaire relatif entre les balais et les bagues sensiblement plus élevées qu'avec des balais monobrins.These changes in characteristics result in appreciable reductions in electrical noise, contact resistance, heating by the Joule effect and mechanical wear due to a reduced and distributed elementary support force. This translates concretely into a noticeable increase in the service life compared to rotary electrical collectors with single-wire brushes as well as the possibility of achieving speeds of relative linear displacement between the brushes and the rings significantly higher than with single-wire brushes. .

De plus, ces avantages sont obtenus pour un coût de fabrication très réduit et sans risquer d'entraîner des courts-circuits dans le collecteur par suite de la cassure accidentelle de certains brins.In addition, these advantages are obtained for a very low manufacturing cost and without the risk of causing short circuits in the collector as a result of the accidental breakage of certain strands.

Dans la variante de réalisation de la figure 4, la gorge 30 à section en forme de V a été remplacée par une gorge à section en forme de U. Cette caractéristique permet notamment d'améliorer la répartition entre les brins 32 des charges dues à la force d'appui avec laquelle le balai est appliqué contre la gorge, tout en préservant l'effet de guidage procuré par cette gorge.In the variant embodiment of FIG. 4, the groove 30 with a V-shaped section has been replaced by a groove with a U-shaped section. This characteristic makes it possible in particular to improve the distribution between the strands 32 of the loads due to the bearing force with which the brush is applied against the groove, while preserving the guiding effect provided by this groove.

Bien que l'utilisation de trois brins dans chacun des balais 28 constitue le meilleur compromis, on peut toutefois envisager de n'utiliser que deux brins, notamment dans le cas d'une gorge à section en forme de U, ou au contraire d'utiliser quatre à cinq brins. Dans ce dernier cas, il est toutefois souhaitable de s'assurer que la fixation des brins sur le stator soit réalisée de façon telle que chacun des brins soit directement en contact avec la gorge 30 usinée sur la bague collectrice 16.Although the use of three strands in each of the brushes 28 constitutes the best compromise, it is however possible to envisage using only two strands, in particular in the case of a groove with a U-shaped section, or on the contrary of use four to five strands. In the latter case, it is however desirable to ensure that the strands are fixed to the stator in such a way that each of the strands is in direct contact with the groove 30 machined on the slip ring 16.

Claims (9)

1. Collecteur électrique tournant à balais multibrins, apte à être placé entre deux pièces (10,12) susceptibles d'être animées d'un mouvement de rotation relative, ce collecteur comprenant au moins une bague collectrice (16) réalisée en un matériau électriquement conducteur et portée par une première desdites pièces et au moins un balai multibrin (28) réalisé en un matériau électriquement conducteur et porté par la deuxième pièce (12) de façon à être en appui latéral glissant contre la bague collectrice, selon une force d'appui déterminée, caractérisé par le fait que chaque balai multibrin (28) comprend un faisceau de deux à cinq brins juxtaposés (32), reçu dans une gorge annulaire (30) de la bague collectrice (16) de façon telle que chacun d'entre eux soit simultanément en contact avec cette gorge.1. An electrical collector rotating with multi-strand brushes, capable of being placed between two parts (10,12) capable of being driven in a relative rotational movement, this collector comprising at least one slip ring (16) made of an electrically material conductive and carried by a first of said parts and at least one multi-strand brush (28) made of an electrically conductive material and carried by the second part (12) so as to be in lateral sliding support against the slip ring, according to a force of determined support, characterized in that each multi-strand brush (28) comprises a bundle of two to five juxtaposed strands (32), received in an annular groove (30) of the slip ring (16) so that each of them be simultaneously in contact with this groove. 2. Collecteur électrique tournant, selon la revendication 1, caractérisé par le fait que chaque balai multibrin (28) comprend trois brins juxtaposés (32).2. Rotating electrical collector, according to claim 1, characterized in that each multi-strand brush (28) comprises three juxtaposed strands (32). 3. Collecteur électrique tournant selon l'une quelconque des revendications 1 et 2, caractérisé par le fait que chaque balai multibrin (28) comprend de plus une embase (34) comportant un réceptacle (36) dans lequel est reçue une extrémité du faisceau et une tige (38) de réglage de ladite force d'appui, portant le réceptacle et apte à être fixée sur un bornier (27) de la deuxième pièce (12).3. rotary electrical collector according to any one of claims 1 and 2, characterized in that each multi-strand brush (28) further comprises a base (34) comprising a receptacle (36) in which is received one end of the bundle and a rod (38) for adjusting said bearing force, carrying the receptacle and capable of being fixed on a terminal block (27) of the second part (12). 4. Collecteur électrique tournant selon la revendication 3, caractérisé par le fait que la tige (38) est une tige rectiligne pliée pour former un angle qui détermine la force d'appui.4. rotary electrical collector according to claim 3, characterized in that the rod (38) is a straight rod bent to form an angle which determines the pressing force. 5. Collecteur électrique tournant selon l'une quelconque des revendications 2 et 3, caractérisé par le fait que les brins (32) sont soudés dans un trou borgne du réceptacle (36).5. rotary electrical collector according to any one of claims 2 and 3, characterized in that the strands (32) are welded in a blind hole in the receptacle (36). 6. Collecteur électrique tournant selon l'une quelconque des revendications précédentes, caractérisé par le fait que les brins (32) ont une même section circulaire, de diamètre compris entre environ 0,15 mm et environ 0,25 mm.6. rotary electrical collector according to any one of the preceding claims, characterized in that the strands (32) have the same circular section, with a diameter between approximately 0.15 mm and approximately 0.25 mm. 7. Collecteur électrique tournant selon l'une quelconque des revendications précédentes, caractérisé par le fait que la gorge annulaire (30) présente une section en forme de U.7. rotary electrical collector according to any one of the preceding claims, characterized in that the annular groove (30) has a U-shaped section. 8. Collecteur électrique tournant selon l'une quelconque des revendications 1 à 3, caractérisé par le fait que la gorge annulaire (30) présente une section en forme de V.8. rotary electrical collector according to any one of claims 1 to 3, characterized in that the annular groove (30) has a V-shaped section. 9. Collecteur électrique tournant selon l'une quelconque des revendications précédentes, caractérisé par le fait que deux balais (28) sont en appui latéral glissant, en sens opposé, dans chacune des gorges annulaires (30).9. rotary electrical collector according to any one of the preceding claims, characterized in that two brushes (28) are in sliding lateral support, in opposite directions, in each of the annular grooves (30).
EP94400681A 1994-01-10 1994-03-30 Rotating electrical slipring with multiwire brushes Expired - Lifetime EP0662736B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9400165 1994-01-10
FR9400165A FR2715005B1 (en) 1994-01-10 1994-01-10 Electric collector rotating with multi-strand brushes.

Publications (2)

Publication Number Publication Date
EP0662736A1 true EP0662736A1 (en) 1995-07-12
EP0662736B1 EP0662736B1 (en) 1998-11-18

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EP (1) EP0662736B1 (en)
DE (1) DE69414687T2 (en)
FR (1) FR2715005B1 (en)

Cited By (23)

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EP0809334A3 (en) * 1996-05-23 1998-11-18 Precisie Industrie v.d. Akker B.V. Slip ring assembly
GB2380867A (en) * 2001-08-09 2003-04-16 Schleifring Und Appbau Gmbh Mounting device for sliding contacts
DE10215809A1 (en) * 2002-04-10 2003-11-06 Schleifring Und Appbau Gmbh Sliding contact provides an electrical connection between a fixed and moving part and is in the form of a multi layer leaf spring
EP1317030A3 (en) * 2001-11-28 2003-12-10 Stemmann-Technik GmbH Slip ring transmitter
WO2009130277A1 (en) * 2008-04-24 2009-10-29 Schleifring Und Apparatebau Gmbh Multiple brush for slip rings
WO2012136670A1 (en) 2011-04-06 2012-10-11 Schleifring Und Apparatebau Gmbh Vibration-resistant slip ring arrangement
DE102011101621A1 (en) 2011-05-14 2012-11-15 Ltn Servotechnik Gmbh Slip ring unit
DE102011077358B3 (en) * 2011-06-10 2012-12-06 Schleifring Und Apparatebau Gmbh Vibration-insensitive brush block for slip rings
DE102011051804A1 (en) 2011-07-13 2013-01-17 Schleifring Und Apparatebau Gmbh Slip ring brush with galvanic multilayer system
WO2013030563A1 (en) * 2011-08-26 2013-03-07 Overview Limited Improved slip ring apparatus and method of manufacturing a slip ring
FR2980921A1 (en) * 2011-10-03 2013-04-05 Centre Nat Etd Spatiales ELECTRICAL MANIFOLD WITH MECHANICALLY INDEPENDENT INSULATION TUBULAR INSULATION SLEEVES.
WO2013107699A1 (en) * 2012-01-16 2013-07-25 Wobben Properties Gmbh Slip ring assembly
DE102012204829A1 (en) 2012-03-12 2013-09-12 Schleifring Und Apparatebau Gmbh Slip ring brush for brush holder of slip ring arrangement for transmission of electric signals between mutually rotatable parts, has insertion mandrel comprising structure for pressing mandrel into hole of holder for receiving brush wire
EP2696442A1 (en) 2012-08-06 2014-02-12 Schleifring und Apparatebau GmbH Multifunctional housing for a slipring module
EP2696449A1 (en) 2012-08-06 2014-02-12 Schleifring und Apparatebau GmbH Slipring with integrated heating unit
WO2014183798A1 (en) 2013-05-17 2014-11-20 Schleifring Und Apparatebau Gmbh High current slipring for multi fiber brushes
US8986053B2 (en) 2012-03-12 2015-03-24 Schleifring Und Apparatebau Gmbh Slip ring brush and holder for slip ring brush
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EP3293836A1 (en) 2016-09-08 2018-03-14 Schleifring und Apparatebau GmbH Methods of making contact wires for slip rings, devices for manufacturing of structured contact wires for slip rings and slip ring brush wires
CN108321650A (en) * 2017-12-29 2018-07-24 杭州驰宏科技有限公司 A kind of rotary connector
EP3454435A1 (en) 2017-09-06 2019-03-13 Schleifring GmbH Stabilized gold wire brush for sliprings
EP3480901A1 (en) 2017-11-06 2019-05-08 Schleifring GmbH Vibration absorbing device for slip-ring brushes
IT202000014803A1 (en) * 2020-06-19 2021-12-19 R M D Components Italia S R L Winder for recharging an electric or hybrid vehicle

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DE10111403B4 (en) * 2001-03-09 2008-07-24 G. Dietrich Gmbh Device for transmitting or removing current to at least one or at least one slip ring
DE102014115291A1 (en) * 2014-10-21 2016-05-12 Ebm-Papst Mulfingen Gmbh & Co. Kg grounding device

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EP0809334A3 (en) * 1996-05-23 1998-11-18 Precisie Industrie v.d. Akker B.V. Slip ring assembly
GB2380867A (en) * 2001-08-09 2003-04-16 Schleifring Und Appbau Gmbh Mounting device for sliding contacts
GB2380867B (en) * 2001-08-09 2005-05-11 Schleifring Und Appbau Gmbh Mounting device for sliding contacts
US6926534B2 (en) 2001-08-09 2005-08-09 Schleifring Und Apparatebau Gmbh Mounting device for sliding contacts
EP1317030A3 (en) * 2001-11-28 2003-12-10 Stemmann-Technik GmbH Slip ring transmitter
DE10215809A1 (en) * 2002-04-10 2003-11-06 Schleifring Und Appbau Gmbh Sliding contact provides an electrical connection between a fixed and moving part and is in the form of a multi layer leaf spring
DE10215809B4 (en) * 2002-04-10 2008-09-25 Schleifring Und Apparatebau Gmbh Sliding contact arrangement
WO2009130277A1 (en) * 2008-04-24 2009-10-29 Schleifring Und Apparatebau Gmbh Multiple brush for slip rings
DE102008001361A1 (en) 2008-04-24 2009-11-05 Schleifring Und Apparatebau Gmbh Multiple brush for slip rings
US8167623B2 (en) 2008-04-24 2012-05-01 Schleifring Und Apparatebau Gmbh Multi contact brush for slip rings
WO2012136670A1 (en) 2011-04-06 2012-10-11 Schleifring Und Apparatebau Gmbh Vibration-resistant slip ring arrangement
DE102011006820A1 (en) 2011-04-06 2012-10-11 Schleifring Und Apparatebau Gmbh Vibration-resistant slip ring arrangement
US9093808B2 (en) 2011-04-06 2015-07-28 Schleifring Und Apparatebau Gmbh Vibration-resistant slip ring device
DE102011101621A1 (en) 2011-05-14 2012-11-15 Ltn Servotechnik Gmbh Slip ring unit
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DE102011077358B3 (en) * 2011-06-10 2012-12-06 Schleifring Und Apparatebau Gmbh Vibration-insensitive brush block for slip rings
WO2012168441A2 (en) 2011-06-10 2012-12-13 Schleifring Und Apparatebau Gmbh Vibration-insensitive brush block for slip rings
US9124055B2 (en) 2011-06-10 2015-09-01 Schleifring Und Apparatebau Gmbh Oscillation proof brushblock for sliprings
DE102011051804B4 (en) * 2011-07-13 2013-09-19 Schleifring Und Apparatebau Gmbh Slip ring brush with galvanic multilayer system
US9640928B2 (en) 2011-07-13 2017-05-02 Schleifring Und Apparatebau Gmbh Slip ring brush having a galvanic multi-layer system
CN103797660A (en) * 2011-07-13 2014-05-14 滑动环及设备制造有限公司 Slip ring brush having a galvanic multi-layer system
WO2013007458A2 (en) 2011-07-13 2013-01-17 Schleifring Und Apparatebau Gmbh Slip ring brush having a galvanic multi-layer system
DE102011051804A1 (en) 2011-07-13 2013-01-17 Schleifring Und Apparatebau Gmbh Slip ring brush with galvanic multilayer system
WO2013030563A1 (en) * 2011-08-26 2013-03-07 Overview Limited Improved slip ring apparatus and method of manufacturing a slip ring
EP2579399A1 (en) * 2011-10-03 2013-04-10 Centre National d'Etudes Spatiales ( C.N.E.S.) Electric collector with tubular insulation sheaths mechanically independent of the conductor
FR2980921A1 (en) * 2011-10-03 2013-04-05 Centre Nat Etd Spatiales ELECTRICAL MANIFOLD WITH MECHANICALLY INDEPENDENT INSULATION TUBULAR INSULATION SLEEVES.
US9356411B2 (en) 2012-01-16 2016-05-31 Wobben Properties Gmbh Slip ring assembly
WO2013107699A1 (en) * 2012-01-16 2013-07-25 Wobben Properties Gmbh Slip ring assembly
DE102013204004A1 (en) 2012-03-12 2013-09-12 Schleifring Und Apparatebau Gmbh Slip ring brushes with blind riveting technology and holder
DE102013204004B4 (en) * 2012-03-12 2020-03-05 Schleifring Gmbh Slip ring brushes with blind riveting and holder
US8986053B2 (en) 2012-03-12 2015-03-24 Schleifring Und Apparatebau Gmbh Slip ring brush and holder for slip ring brush
DE102012204829A1 (en) 2012-03-12 2013-09-12 Schleifring Und Apparatebau Gmbh Slip ring brush for brush holder of slip ring arrangement for transmission of electric signals between mutually rotatable parts, has insertion mandrel comprising structure for pressing mandrel into hole of holder for receiving brush wire
EP2696442A1 (en) 2012-08-06 2014-02-12 Schleifring und Apparatebau GmbH Multifunctional housing for a slipring module
EP2696443A3 (en) * 2012-08-06 2014-08-06 Schleifring und Apparatebau GmbH Multifunctional housing for a slipring module
EP2696443A2 (en) 2012-08-06 2014-02-12 Schleifring und Apparatebau GmbH Multifunctional housing for a slipring module
EP2696449A1 (en) 2012-08-06 2014-02-12 Schleifring und Apparatebau GmbH Slipring with integrated heating unit
US10396516B2 (en) 2012-08-06 2019-08-27 Schleifring Gmbh Slipring with integrated heating unit
WO2014183798A1 (en) 2013-05-17 2014-11-20 Schleifring Und Apparatebau Gmbh High current slipring for multi fiber brushes
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EP2924817A1 (en) 2014-03-27 2015-09-30 Schleifring und Apparatebau GmbH Slipring with Active Cooling
US10355561B2 (en) 2014-03-27 2019-07-16 Schleifring Gmbh Slipring with active cooling
WO2015144840A1 (en) 2014-03-27 2015-10-01 Schleifring Und Apparatebau Gmbh Slipring with active cooling
EP3293836A1 (en) 2016-09-08 2018-03-14 Schleifring und Apparatebau GmbH Methods of making contact wires for slip rings, devices for manufacturing of structured contact wires for slip rings and slip ring brush wires
EP3454435A1 (en) 2017-09-06 2019-03-13 Schleifring GmbH Stabilized gold wire brush for sliprings
US10424889B2 (en) 2017-09-06 2019-09-24 Schleifring Gmbh Stabilized gold wire brush for sliprings
EP3480901A1 (en) 2017-11-06 2019-05-08 Schleifring GmbH Vibration absorbing device for slip-ring brushes
US10833467B2 (en) * 2017-11-06 2020-11-10 Schleifring Gmbh Vibration absorbing device for slip-ring brushes
CN108321650A (en) * 2017-12-29 2018-07-24 杭州驰宏科技有限公司 A kind of rotary connector
IT202000014803A1 (en) * 2020-06-19 2021-12-19 R M D Components Italia S R L Winder for recharging an electric or hybrid vehicle

Also Published As

Publication number Publication date
DE69414687D1 (en) 1998-12-24
FR2715005A1 (en) 1995-07-13
DE69414687T2 (en) 1999-06-10
FR2715005B1 (en) 1996-03-22
EP0662736B1 (en) 1998-11-18

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