EP2973952A1 - Electrical machine rotor provided with at least one hoop for retaining the turns of the winding and corresponding electrical machine - Google Patents

Electrical machine rotor provided with at least one hoop for retaining the turns of the winding and corresponding electrical machine

Info

Publication number
EP2973952A1
EP2973952A1 EP14713555.2A EP14713555A EP2973952A1 EP 2973952 A1 EP2973952 A1 EP 2973952A1 EP 14713555 A EP14713555 A EP 14713555A EP 2973952 A1 EP2973952 A1 EP 2973952A1
Authority
EP
European Patent Office
Prior art keywords
hoop
rotor
layer
bun
rotor according
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Withdrawn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
EP14713555.2A
Other languages
German (de)
French (fr)
Inventor
Laurent Odin
Maximilien Gentil
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.)
Valeo Equipements Electriques Moteur SAS
Original Assignee
Valeo Equipements Electriques Moteur SAS
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 Valeo Equipements Electriques Moteur SAS filed Critical Valeo Equipements Electriques Moteur SAS
Publication of EP2973952A1 publication Critical patent/EP2973952A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H02K3/51—Fastening of winding heads, equalising connectors, or connections thereto applicable to rotors only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto

Definitions

  • the invention relates to a rotor provided with at least one ferrule for holding windings and the corresponding electric machine.
  • the invention finds a particularly advantageous, but not exclusive, application in the field of starters for a motor vehicle.
  • the rotor 1 comprises a collector 2 provided with electrically conductive blades 3, such as copper blades, which extend side by side on its outer periphery.
  • the rotor 1 also has longitudinal notches in its body 8 consisting of a bundle of sheets.
  • conductors 9 whose ends are welded to a portion of each blade 3 are threaded inside the notches 5.
  • the axis of the notches 5 coincides with the axis of the coils.
  • blades 3, that is to say that the blades 3 are in front of the notches 5. More specifically, each conductor 9 covered with a layer of enamel 91 for its insulation has two branches connected by a bottom 93 so to form a U.
  • the tightening between the hoop 14, 15 and the corresponding bun 12, 13 is between less than 0.15 mm and less than 0.55 mm.
  • the tightening of the hoop 14, 15 is such that there is not enough space between two adjacent conductors 9 to allow migration of a varnish 16 during an impregnation operation, as is clearly apparent from the Figures 2a and 2b.
  • the vibrations can therefore damage the email layer 91 of the conductors 9, which causes short-circuit problems at the neighboring conductors 9 in contact inside the buns 12 , 13.
  • a collector comprising an electrically conductive blade assembly
  • a winding formed by a set of conductors inserted at least partly inside the notches and electrically connected to the collector blades, portions of the conductors projecting from radial faces of the axial end of the body of the collector; rotor constituting coils winding,
  • hoop mounted axially relative to the body around a bun having an annular wall of axial orientation provided with means for retaining the hoop to axially secure the hoop to the bun and rotated relative to an axis of the hoop.
  • the hoop being provided with retaining means, it is possible to reduce the clamping force between the hoop and the buns, or even to mount them with clearance. As a result, the drivers who are less constrained in the buns are spaced apart. others, which optimizes the filling rate of varnish inside buns and thus greatly reduce the risk of short circuit.
  • the retaining means of the hoop are intended to impose a shape on a layer of impregnation located on the periphery of the bun such that the hoop is retained by said impregnating varnish layer.
  • the impregnating layer is a layer of impregnating varnish on the entire rotor to stiffen said rotor.
  • the retaining means comprise at least one hole made in the wall of the hoop for the passage of the impregnation layer so that the impregnating varnish layer has at least one protruding penetrating inside the hole.
  • the hole is a through opening.
  • the opening has an axis oriented radially relative to the axis of the hoop. This improves the infiltration of the infiltration layer in the opening of the hoop.
  • the retaining means comprise a plurality of openings spaced angularly in a regular manner around the wall of the hoop.
  • the retaining means comprise at least one protuberance intended to penetrate inside at least one hollow of the impregnating varnish layer.
  • the protrusion is either axial and the impregnation layer prevents the rotation of the hoop through this protuberance. This ensures the anti rotation of the hoop relative to the bun even in case of significant centrifugal force.
  • the impregnation layer disposed on the bun to stiffen the conductor segments of the bun is disposed before the insertion of the hoop.
  • the portions of the conductor segments radially located under the hoop are in contact via the impregnation layer. This avoids that by vibration, the varnish between the portions of the segments of the conductors opposite is removed by sintering and thus avoid electrical contact causing a malfunction of the rotor.
  • the hoop and the bun are mounted together with a clearance of between 0.15mm and 0.14mm.
  • This positive and negative clearance makes it possible to insert the hoop around the conductor segments forming the bun by hand while ensuring, through the impregnation layer, its role of holding the bun conductor segments against the centrifugal force.
  • the hoop has an internal diameter of between 47.55mm and 47.65mm while the bun has an outer diameter of between 47.5mm and 47.8mm.
  • the hoop is made of an electrically insulating material.
  • the rotor comprises two frets each positioned around a bun.
  • two portions of the conductors surrounded by the hoop delimited by the radial plane of the hoop are in contact via an impregnation layer. This prevents the insulators of the portions of conductors from being crumbled by the vibrations.
  • the invention also relates to an electric machine characterized in that it comprises a rotor according to the invention.
  • Figure 1 already described, shows an overall perspective view of a rotor according to the state of the art
  • FIGS. 2a and 2b already described, show sectional views of the conductors in the bunches respectively after the positioning of a holding band around the bun and after the impregnation operation for a rotor according to the state of the art ;
  • Figure 3 shows an overall perspective view of a rotor according to the invention;
  • Figures 4a and 4b respectively show perspective views and in cross section of a holding band of a bun according to the invention
  • Figure 4c shows a sectional view of the retaining band according to the plane B-B of Figure 4b perpendicular to an axis of the hoop;
  • Figures 5a and 5b show sectional views of the conductors in the buns respectively after the positioning of a holding band around the bun and after the impregnation operation for a rotor according to the invention
  • FIGS 6a and 6b show schematic representations of the bonding zone between the holding ferrule according to the invention and the impregnating varnish layer according to two embodiments of the invention
  • Figure 7 shows a schematic representation of the two conductor layers positioned within the notches of the rotor showing the S-shaped notch insulator.
  • FIG. 3 shows a rotor 30 comprising a body 31 mounted on a shaft 32 of axis X.
  • This body 31 in the form of a bundle of sheets has an outer periphery 31 1 of cylindrical shape delimited axially by two end faces 312, 313 of radial orientation.
  • Notches 33 are formed longitudinally at the outer periphery of the body 31.
  • a set of conductors 36 are threaded inside each of these notches 33.
  • the rotor 30 is provided with a manifold 37 comprising a plurality of contact pieces, here electrically conductive blades 39 to which the ends of the conductors 36 are welded.
  • the blades 39 and the conductors 36 are made of copper.
  • the blades 39 of the collector 37 are carried by a support 40 of plastics material integral with the shaft 32.
  • the support 40 of the collector is, for good temperature resistance, made of thermosetting plastics material, such as a phenolic plastics material thermosetting by example of Bakelite.
  • the collet 37 which has blades 39 extending longitudinally side by side on the outer periphery of the support 40 is of the "drum" type.
  • the manifold 37 used may be a flat type collector.
  • each conductor 36 is here coated with an electrically insulating layer 360, such as enamel, and has two branches 361, 362 connected by a bottom 363 so as to form a U.
  • the ends of a conductor 36 welded on the blades 39 are constituted by the free ends of each branch 361, 362.
  • the conductors 36 are threaded inside the notches 33 on two distinct layers: the top layer and the layer lower. If one of the branches 361, 362 is positioned in the lower layer then the other branch 361, 362 is in the upper layer and vice versa.
  • the cross section of the conductors 36 may be round or square or rectangular.
  • the portions of the conductors 36 projecting from the end faces 312, 313 of the body 31 of the rotor 30 form the buns 43, 44 of the coil.
  • a notch insulator 46 is positioned around the limbs 361, 362 of the leads.
  • this insulator 46 has an S-shaped section.
  • This insulator makes it possible not to harm the conductors 36 (coated with the enamel thin layer 360) during their assembly in the bundle of sheets of the rotor 30 equipped with by definition of burrs and fluted for force fitting of the rotor plate package.
  • This also electrically insulates the conductors 36 from the grounded package of sheets via the starter housing.
  • the clearance between the insulator 46 and the edges of the notches 33 is filled with an impregnating varnish.
  • Frets 49, 50 of electrically insulating material visible in Figure 1 are threaded around the buns 43, 44.
  • a first band 49 is threaded around the bun 43 located on the side of the collector 37 and formed in particular by the ends of the branches of the conductors 36.
  • a second hoop 50 is threaded around the bun 44 located on the opposite side and formed in particular by the funds 363 and a portion of the branches 361 , 362 of the conductors 36 located near the bottoms 363.
  • Each band 49, 50 is provided with retaining means 48. of the hoop axially relative to the body 31 and in rotation relative to a Y axis of the hoop 49, 50. This Y axis is substantially coincident with the X axis of the rotor when the hoop 48, 49 is positioned around the bun 43 , 44 of the corresponding winding.
  • these frets 49, 50 have an annular wall 51 of axial orientation having an inner periphery 52 intended to be pressed against an outer periphery of the bun 43, 44 corresponding and an outer periphery 53 facing outwardly of the hoop.
  • the inner periphery 52 and the outer periphery 53 are connected by edges 54, 55 of axial ends.
  • One of the edges 54 is intended to be positioned near one end face 312, 313 of the rotor 30 while the other edge 55 is intended to be positioned axially on the opposite side.
  • the retaining means 48 comprise through-openings 63 for the passage of the impregnation varnish formed in the wall 51. These openings 63 have a Z axis radially oriented relative to the Y axis of the wall of the hoop 49, 50.
  • the impregnating varnish can penetrate inside the openings 63 acting as a mold to form projections 64 in the varnish layer 68 situated at the outer periphery of the 43, 44.
  • These projections 64 have a shape complementary to the openings 63.
  • the frets 49, 50 will be retained axially and in rotation by the projections 64 in engagement with the openings 63.
  • a varnish is used for example based on heat-resistant epoxy resin which stiffens during its polymerization.
  • Other said openings 63 formed in the wall 51 of the hoop 49, 50 act as an axial lock and block in rotation the hoop 49, 50 which are retained by the polymerized impregnating varnish penetrating inside the openings 63.
  • each band 49, 50 comprises six openings 63 spaced angularly in a regular manner around the wall 51 of the band 49, 50. There is thus an angular gap A of the order of 60 degrees between two consecutive openings 63 (see Figure 4c).
  • the number of openings 63 may vary depending on the application. Alternatively, the openings 63 are not through.
  • the openings 63 have a Z axis that is axially oriented with respect to the Y axis of the wall 51, for example taking the form of elongated openings of rectangular shape extending between the edges 54, 55 of the wall annular 51 frets.
  • the frets 49, 50 and the buns 43, 44 are mounted between them with a clearance preferably between 0.15 mm and 0.14 mm less.
  • Positive play means that the hoop 49, 50 has an internal diameter D1 larger than the external diameter D2 of the corresponding bun 43, 44 (the buns 43 and 44 may have different external diameters D2) while a negative play means that the hoop 49, 50 has an internal diameter D1 smaller than the external diameter D2 of the bun 43, 44 corresponding.
  • the hoop 49, 50 has an internal diameter D1 of between 47.55mm and 47.65mm; while the bun has an outer diameter D2 (see Figure 1) between 47.5mm and 47.8mm.
  • each band 49, 50 has an internal diameter D1 of the order of 47.6 mm, a width L1 of the order of 5 mm and a thickness L 2 of the order of 1. mm.
  • the openings 63 have a diameter L3 of the order of 2.5 mm.
  • the retaining means 48 comprise protuberances 69 in place of or in addition to the openings 63.
  • protuberances 69 take for example the shape of a cylindrical rod of small dimensions originating from the inner periphery 52 of the wall of the band 49, 50 and directed towards the inside of the band 49, 50.
  • the bands 49, 50 will impose on the layer of varnish 68 a shape such that the protuberances 69 will penetrate inside recesses 70 of the lacquer layer 68.
  • the frets 49, 50 will be retained axially and in rotation relative to the axis Y by said protuberances 69 in engagement with the recesses 70 after polymerization of the lacquer layer 68.
  • the frets 49, 50 are made of an electrically insulating material.
  • the frets 49, 50 are advantageously made in one piece, that is to say that there is continuity of material between the different zones of a band 49, 50.
  • a third band 75 provides radial retention of the conductors 36 to prevent the effects of the centrifugal force on the solder ends of the conductors 36 between them and on the blades 39 of the manifold 37.
  • the rotor 30 may comprise at one end of its shaft 32 a gear wheel 78 located on the opposite side of the collector 37 and intended to form a sun gear in a planetary gear reduction system of a starter, as described for example in the document FR2787833.
  • the invention also relates to the electric machine equipped with the rotor 30 described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The invention relates to a wound rotor (30) comprising a cylindrical body (31) mounted on a shaft (32), a collector (37) including a set of electrically conductive blades (39), notches (33) that are longitudinally provided on an outer periphery of the body (31) of the rotor, and a winding made of a set of conductors (36) that is at least partially inserted inside the notches (33) and is electrically connected to the blades (39) of the collector (37), portions of the conductors (36) that project relative to the radial surfaces an axial end of the body of the rotor constituting the turns (43, 44) of the winding. According to the invention, the rotor (30) further comprises at least one hoop (49, 50) provided around a turn (43, 44) having an axially oriented annular wall provided with means for retaining the hoop axially relative to the body (31) of the rotor and rotatably relative to an axis (Y) of the hoop.

Description

ROTOR DE MACHINE ELECTRIQUE MUNI D'AU MOINS UNE FRETTE DE MAINTIEN DES CHIGNONS DU BOBINAGE ET MACHINE ELECTRIQUE CORRESPONDANTE  ELECTRIC MACHINE ROTOR PROVIDED WITH AT LEAST ONE WELDING CHUNK HOLDING FREIGHT AND CORRESPONDING ELECTRIC MACHINE
DOMAINE DE L'INVENTION L'invention concerne un rotor muni d'au moins une frette de maintien des chignons du bobinage ainsi que la machine électrique correspondante. L'invention trouve une application particulièrement avantageuse, mais non exclusive, dans le domaine des démarreurs pour véhicule automobile. FIELD OF THE INVENTION The invention relates to a rotor provided with at least one ferrule for holding windings and the corresponding electric machine. The invention finds a particularly advantageous, but not exclusive, application in the field of starters for a motor vehicle.
ETAT DE LA TECHNIQUE On connaît des machines électriques munies d'un stator, ou inducteur, comportant plusieurs aimants permanents ou des pôles bobinés (électroaimants) et d'un rotor, ou induit, comportant des conducteurs formant le bobinage du rotor doté d'un corps de forme cylindrique. Un entrefer existe entre la périphérie externe du corps du rotor et la périphérie interne des aimants du stator. STATE OF THE ART Electrical machines provided with a stator, or inductor, comprising several permanent magnets or wound poles (electromagnets) and a rotor, or an armature, comprising conductors forming the rotor winding provided with a rotor, are known. cylindrical body. An air gap exists between the outer periphery of the rotor body and the inner periphery of the stator magnets.
Comme montré sur la figure 1 , le rotor 1 comporte un collecteur 2 muni de lames 3 électriquement conductrices, telles que des lames en cuivre, qui s'étendent côte à côte sur sa périphérie externe. Le rotor 1 présente également des encoches 5 longitudinales ménagées dans son corps 8 consistant en un paquet de tôles. Pour former le bobinage, des conducteurs 9 dont les extrémités sont soudées sur une partie de chaque lame 3 sont enfilés à l'intérieur des encoches 5. Dans cette configuration connue de type tambour, l'axe des encoches 5 coïncide avec l'axe des lames 3, c'est-à-dire que les lames 3 se trouvent en face des encoches 5. Plus précisément, chaque conducteur 9 recouvert d'une couche d'émail 91 pour son isolation présente deux branches reliées par un fond 93 de manière à former un U. Ces conducteurs 9 dont les extrémités sont soudées sur les lames 3 du collecteur 2 sont insérés à l'intérieur des encoches 5 du rotor sur deux couches distinctes : la couche supérieure et la couche inférieure. Les parties des conducteurs 9 qui s'étendent en saillie de chaque côté du rotor 1 sont appelées chignons 12, 13. Pour assurer un maintien radial des conducteurs 9 dans les chignons et éviter ainsi les effets de la force centrifuge, des frettes 14, 15 sont positionnées respectivement autour des chignons 12, 13. Pour que les frettes 14 aient une bonne tenue mécanique, un serrage important est effectué entre les frettes 14, 15 et les chignons 12, 13. Généralement, le diamètre d'un chignon 12, 13 est compris entre 46.7 et 47mm; tandis que le diamètre interne d'une frette 14, 15 est compris entre 46.45 et 46.55mm. Le serrage entre la frette 14, 15 et le chignon 12, 13 correspondant est compris entre moins 0.15mm et moins 0.55mm. Le serrage de la frette 14, 15 est tel qu'il n'y a pas assez d'espace entre deux conducteurs 9 voisins pour permettre une migration d'un vernis 16 lors d'une opération d'imprégnation, comme cela ressort clairement des figures 2a et 2b. Au cours de l'utilisation de la machine électrique, les vibrations peuvent donc endommager la couche d'email 91 des conducteurs 9, ce qui engendre des problèmes de court-circuit au niveau des conducteurs 9 voisins en contact à l'intérieur des chignons 12, 13. As shown in Figure 1, the rotor 1 comprises a collector 2 provided with electrically conductive blades 3, such as copper blades, which extend side by side on its outer periphery. The rotor 1 also has longitudinal notches in its body 8 consisting of a bundle of sheets. To form the winding, conductors 9 whose ends are welded to a portion of each blade 3 are threaded inside the notches 5. In this known drum-type configuration, the axis of the notches 5 coincides with the axis of the coils. blades 3, that is to say that the blades 3 are in front of the notches 5. More specifically, each conductor 9 covered with a layer of enamel 91 for its insulation has two branches connected by a bottom 93 so to form a U. These conductors 9 whose ends are welded to the blades 3 of the collector 2 are inserted inside the notches 5 of the rotor on two separate layers: the upper layer and the lower layer. The portions of the conductors 9 which protrude from each side of the rotor 1 are called buns 12, 13. To ensure radial retention of the conductors 9 in the buns and thus avoid the effects of the centrifugal force, the hoop 14, 15 are positioned respectively around the buns 12, 13. For the hoop 14 have a good mechanical strength, a significant tightening is made between the frets 14, 15 and buns 12, 13. Generally, the diameter of a bun 12, 13 is between 46.7 and 47mm; while the inner diameter of a band 14, 15 is between 46.45 and 46.55mm. The tightening between the hoop 14, 15 and the corresponding bun 12, 13 is between less than 0.15 mm and less than 0.55 mm. The tightening of the hoop 14, 15 is such that there is not enough space between two adjacent conductors 9 to allow migration of a varnish 16 during an impregnation operation, as is clearly apparent from the Figures 2a and 2b. During the use of the electrical machine, the vibrations can therefore damage the email layer 91 of the conductors 9, which causes short-circuit problems at the neighboring conductors 9 in contact inside the buns 12 , 13.
OBJET DE L'INVENTION OBJECT OF THE INVENTION
L'invention vise à remédier efficacement à cet inconvénient en proposant un rotor bobiné comportant: The aim of the invention is to effectively remedy this disadvantage by proposing a wound rotor comprising:
- un corps de forme cylindrique monté sur un arbre, a cylindrical body mounted on a shaft,
- un collecteur comprenant un ensemble de lames électriquement conductrice,  a collector comprising an electrically conductive blade assembly,
- des encoches ménagées longitudinalement sur une périphérie externe du corps du rotor, et  notches arranged longitudinally on an outer periphery of the rotor body, and
- un bobinage formé par un ensemble de conducteurs insérés au moins en partie à l'intérieur des encoches et reliés électriquement aux lames du collecteur, des parties des conducteurs s'étendant en saillie par rapport à des faces radiales d'extrémité axiale du corps du rotor constituant des chignons du bobinage, a winding formed by a set of conductors inserted at least partly inside the notches and electrically connected to the collector blades, portions of the conductors projecting from radial faces of the axial end of the body of the collector; rotor constituting coils winding,
caractérisé en ce qu'il comporte en outre au moins une frette montée axialement par rapport au corps autour d'un chignon ayant une paroi annulaire d'orientation axiale munie de moyens de retenue de la frette pour solidariser axialement la frette au chignon et en rotation par rapport à un axe de la frette. characterized in that it further comprises at least one hoop mounted axially relative to the body around a bun having an annular wall of axial orientation provided with means for retaining the hoop to axially secure the hoop to the bun and rotated relative to an axis of the hoop.
La frette étant munie de moyens de retenue, il est possible de réduire l'effort de serrage entre les frettes et les chignons, voire même de les monter avec jeu. En conséquence, les conducteurs qui sont moins contraints dans les chignons sont espacés les uns des autres, ce qui permet d'optimiser le taux de remplissage de vernis à l'intérieur des chignons et donc de réduire grandement les risques de court-circuit. The hoop being provided with retaining means, it is possible to reduce the clamping force between the hoop and the buns, or even to mount them with clearance. As a result, the drivers who are less constrained in the buns are spaced apart. others, which optimizes the filling rate of varnish inside buns and thus greatly reduce the risk of short circuit.
Selon une réalisation, les moyens de retenue de la frette sont destinés à imposer une forme à une couche de d'imprégnation située en périphérie du chignon telle que la frette est retenue par ladite couche de vernis d'imprégnation. According to one embodiment, the retaining means of the hoop are intended to impose a shape on a layer of impregnation located on the periphery of the bun such that the hoop is retained by said impregnating varnish layer.
Ainsi une simple couche d'imprégnation permet de solidifier la frette aux conducteurs du chignon. Selon une réalisation la couche d'imprégnation est une couche de vernis d'imprégnation sur l'ensemble du rotor pour rigidifier ledit rotor. Thus, a single impregnation layer makes it possible to solidify the band to the chignon conductors. According to one embodiment the impregnating layer is a layer of impregnating varnish on the entire rotor to stiffen said rotor.
Cela permet d'utiliser une seule couche pour à la fois rigidifier les segments de conducteurs dans le chignon et la frette au chignon. This makes it possible to use a single layer to both stiffen the conductor segments in the bun and the bun fringe.
Selon une réalisation, les moyens de retenue comportent au moins un trou réalisé dans la paroi de la frette pour le passage de la couche d'imprégnation de sorte que la couche de vernis d'imprégnation présente au moins une saillie pénétrant à l'intérieur du trou. According to one embodiment, the retaining means comprise at least one hole made in the wall of the hoop for the passage of the impregnation layer so that the impregnating varnish layer has at least one protruding penetrating inside the hole.
Selon une réalisation, le trou est une ouverture traversante. In one embodiment, the hole is a through opening.
Cela permet que la couche d'imprégnation soit infiltrée entre les portions des segments de conducteurs, entourée par la frette, délimitées par le plan radial de la frette. This allows the impregnation layer is infiltrated between the portions of the conductor segments, surrounded by the hoop, delimited by the radial plane of the hoop.
Selon une réalisation, l'ouverture présente un axe orienté radialement par rapport à l'axe de la frette. Cela permet d'améliorer l'infiltration de la couche d'infiltration dans l'ouverture de la frette. According to one embodiment, the opening has an axis oriented radially relative to the axis of the hoop. This improves the infiltration of the infiltration layer in the opening of the hoop.
Selon une réalisation, les moyens de retenue comportent une pluralité d'ouvertures espacées angulairement de manière régulière autour de la paroi de la frette. In one embodiment, the retaining means comprise a plurality of openings spaced angularly in a regular manner around the wall of the hoop.
Cela permet de solidifier la frette sur le chignon de façon homogène. This helps to solidify the band on the bun homogeneously.
Selon une réalisation, les moyens de retenue comportent au moins une protubérance destinée à pénétrer à l'intérieur d'au moins un creux de la couche de vernis d'imprégnation. Dans un exemple de ce mode de réalisation, la protubérance est soit axiale et la couche d'imprégnation empêche la rotation de la frette par le biais de cette protubérance. Cela permet d'assurer l'anti rotation de la frette par rapport au chignon même en cas de force centrifuge importante. According to one embodiment, the retaining means comprise at least one protuberance intended to penetrate inside at least one hollow of the impregnating varnish layer. In an example of this embodiment, the protrusion is either axial and the impregnation layer prevents the rotation of the hoop through this protuberance. This ensures the anti rotation of the hoop relative to the bun even in case of significant centrifugal force.
Dans un autre mode de réalisation précédemment décrit, la couche d'imprégnation disposée sur le chignon pour rigidifier les segments de conducteur du chignon est disposée avant l'insertion de la frette. In another embodiment previously described, the impregnation layer disposed on the bun to stiffen the conductor segments of the bun is disposed before the insertion of the hoop.
Dans ce mode de réalisations les portions des segments de conducteur radialement située sous la frette sont en contact par le biais de la couche d'imprégnation. Cela permet d'éviter que par vibration, le vernis entre les portions de segments des conducteurs en vis à vis s'enlève par frittage et donc éviter un contact électrique provoquant un disfonctionnement du rotor. In this embodiment, the portions of the conductor segments radially located under the hoop are in contact via the impregnation layer. This avoids that by vibration, the varnish between the portions of the segments of the conductors opposite is removed by sintering and thus avoid electrical contact causing a malfunction of the rotor.
Selon une réalisation, la frette et le chignon sont montés entre eux avec un jeu compris entre plus 0.15mm et moins 0.14mm. Ce jeu positive et négative permet d'insérer la frette autour des segments de conducteurs formant le chignon à la main tout en assurant par le biais de la couche d'imprégnation son rôle de maintien des segments de conducteurs du chignon contre la force centrifuge. Selon une réalisation, la frette présente un diamètre interne compris entre 47.55mm et 47.65mm tandis que le chignon présente un diamètre externe compris entre 47.5mm et 47.8mm. In one embodiment, the hoop and the bun are mounted together with a clearance of between 0.15mm and 0.14mm. This positive and negative clearance makes it possible to insert the hoop around the conductor segments forming the bun by hand while ensuring, through the impregnation layer, its role of holding the bun conductor segments against the centrifugal force. According to one embodiment, the hoop has an internal diameter of between 47.55mm and 47.65mm while the bun has an outer diameter of between 47.5mm and 47.8mm.
Selon une réalisation, la frette est réalisée dans un matériau électriquement isolant. In one embodiment, the hoop is made of an electrically insulating material.
Cela permet d'éviter un court-circuit entre des conducteurs par le biais de la frette dans le cas ou deux portions de segments de conducteurs sont dépourvues d'isolant lors de friction entre la frette et ces portions de conducteurs. Selon une réalisation, le rotor comporte deux frettes positionnées chacune autour d'un chignon. This avoids a short circuit between conductors through the hoop in the case where two portions of conductor segments are devoid of insulation when friction between the hoop and these portions of conductors. In one embodiment, the rotor comprises two frets each positioned around a bun.
Cela permet d'assurer pour certain type de bobinage le maintien des deux chignons. This ensures for certain type of winding the maintenance of both buns.
Selon une réalisation, deux portions des conducteurs entourées par la frette délimitées par le plan radial de la frette sont en contact par le biais d'une couche d'imprégnation. Cela permet d'éviter que les isolants des portions de conducteurs s'effritent par les vibrations. According to one embodiment, two portions of the conductors surrounded by the hoop delimited by the radial plane of the hoop are in contact via an impregnation layer. This prevents the insulators of the portions of conductors from being crumbled by the vibrations.
L'invention a également pour objet une machine électrique caractérisée en ce qu'elle comporte un rotor selon l'invention. BREVE DESCRIPTION DES DESSINS The invention also relates to an electric machine characterized in that it comprises a rotor according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS
L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Ces figures ne sont données qu'à titre illustratif mais nullement limitatif de l'invention. The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given for illustrative but not limiting of the invention.
La figure 1 , déjà décrite, montre une vue d'ensemble en perspective d'un rotor selon l'état de la technique ; Figure 1, already described, shows an overall perspective view of a rotor according to the state of the art;
Les figures 2a et 2b, déjà décrites, montrent des vues en coupe des conducteurs dans les chignons respectivement après le positionnement d'une frette de maintien autour du chignon et après l'opération d'imprégnation pour un rotor selon l'état de la technique; La figure 3 montre une vue d'ensemble en perspective d'un rotor selon l'invention ; FIGS. 2a and 2b, already described, show sectional views of the conductors in the bunches respectively after the positioning of a holding band around the bun and after the impregnation operation for a rotor according to the state of the art ; Figure 3 shows an overall perspective view of a rotor according to the invention;
Les figures 4a et 4b représentent respectivement des vues en perspective et en coupe transversale d'une frette de maintien d'un chignon selon l'invention; La figure 4c représente une vue en coupe de la frette de maintien selon le plan B-B de la figure 4b perpendiculaire à un axe de la frette; Figures 4a and 4b respectively show perspective views and in cross section of a holding band of a bun according to the invention; Figure 4c shows a sectional view of the retaining band according to the plane B-B of Figure 4b perpendicular to an axis of the hoop;
Les figures 5a et 5b montrent des vues en coupe des conducteurs dans les chignons respectivement après le positionnement d'une frette de maintien autour du chignon et après l'opération d'imprégnation pour un rotor selon l'invention ; Figures 5a and 5b show sectional views of the conductors in the buns respectively after the positioning of a holding band around the bun and after the impregnation operation for a rotor according to the invention;
Les figures 6a et 6b montrent des représentations schématiques de la zone de liaison entre la frette de maintien selon l'invention et la couche de vernis d'imprégnation suivant deux modes de réalisation de l'invention; Figures 6a and 6b show schematic representations of the bonding zone between the holding ferrule according to the invention and the impregnating varnish layer according to two embodiments of the invention;
La figure 7 montre une représentation schématique des deux couches de conducteurs positionnées à l'intérieur des encoches du rotor faisant apparaître l'isolant d'encoche en forme de S. Figure 7 shows a schematic representation of the two conductor layers positioned within the notches of the rotor showing the S-shaped notch insulator.
Les éléments identiques, similaires ou analogues conservent les mêmes références d'une figure à l'autre. Identical, similar or similar elements retain the same references from one figure to another.
DESCRIPTION D'EXEMPLES DE REALISATION DE L'INVENTION La figure 3 montre un rotor 30 comportant un corps 31 monté sur un arbre 32 d'axe X. Ce corps 31 en forme de paquet de tôles présente une périphérie externe 31 1 de forme cylindrique délimitée axialement par deux faces d'extrémité 312, 313 d'orientation radiale. Des encoches 33 sont ménagées longitudinalement à la périphérie externe du corps 31 . Pour former le bobinage, un ensemble de conducteurs 36 sont enfilés à l'intérieur de chacune de ces encoches 33. EXAMPLES OF EMBODIMENTS OF THE INVENTION FIG. 3 shows a rotor 30 comprising a body 31 mounted on a shaft 32 of axis X. This body 31 in the form of a bundle of sheets has an outer periphery 31 1 of cylindrical shape delimited axially by two end faces 312, 313 of radial orientation. Notches 33 are formed longitudinally at the outer periphery of the body 31. To form the winding, a set of conductors 36 are threaded inside each of these notches 33.
En outre, le rotor 30 est pourvu d'un collecteur 37 comprenant une pluralité de pièces de contact, ici des lames 39 électriquement conductrices auxquelles les extrémités des conducteurs 36 sont soudées. Dans un exemple de réalisation, les lames 39 ainsi que les conducteurs 36 sont réalisés en cuivre. Les lames 39 du collecteur 37 sont portées par un support 40 en matière plastique solidaire de l'arbre 32. Le support 40 du collecteur est, pour une bonne tenue en température, en matière plastique thermodurcissable, telle qu'une matière plastique phénolique thermodurcissable par exemple de la bakélite. En l'occurrence, le colleteur 37 qui présente des lames 39 s'étendant longitudinalement côte à côte sur la périphérie externe du support 40 est du type « tambour ». Toutefois, en variante, le collecteur 37 utilisé pourra être un collecteur de type plat. Plus précisément, chaque conducteur 36 est ici revêtu d'une couche électriquement isolante 360, telle que de l'émail, et présente deux branches 361 , 362 reliées par un fond 363 de manière à former un U. Les extrémités d'un conducteur 36 soudées sur les lames 39 sont constituées par les extrémités libres de chaque branche 361 , 362. Comme cela est visible sur la figure 7, les conducteurs 36 sont enfilés à l'intérieur des encoches 33 sur deux couches distinctes : la couche supérieure et la couche inférieure. Si une des branches 361 , 362 est positionnée dans la couche inférieure alors l'autre branche 361 , 362 se situe dans la couche supérieure et inversement. La section transversale des conducteurs 36 peut être ronde ou carrée ou rectangulaire. Les parties des conducteurs 36 s'étendant en saillie par rapport aux faces d'extrémités 312, 313 du corps 31 du rotor 30 forment les chignons 43, 44 du bobinage. In addition, the rotor 30 is provided with a manifold 37 comprising a plurality of contact pieces, here electrically conductive blades 39 to which the ends of the conductors 36 are welded. In one embodiment, the blades 39 and the conductors 36 are made of copper. The blades 39 of the collector 37 are carried by a support 40 of plastics material integral with the shaft 32. The support 40 of the collector is, for good temperature resistance, made of thermosetting plastics material, such as a phenolic plastics material thermosetting by example of Bakelite. In this case, the collet 37 which has blades 39 extending longitudinally side by side on the outer periphery of the support 40 is of the "drum" type. However, alternatively, the manifold 37 used may be a flat type collector. More specifically, each conductor 36 is here coated with an electrically insulating layer 360, such as enamel, and has two branches 361, 362 connected by a bottom 363 so as to form a U. The ends of a conductor 36 welded on the blades 39 are constituted by the free ends of each branch 361, 362. As can be seen in FIG. 7, the conductors 36 are threaded inside the notches 33 on two distinct layers: the top layer and the layer lower. If one of the branches 361, 362 is positioned in the lower layer then the other branch 361, 362 is in the upper layer and vice versa. The cross section of the conductors 36 may be round or square or rectangular. The portions of the conductors 36 projecting from the end faces 312, 313 of the body 31 of the rotor 30 form the buns 43, 44 of the coil.
Comme montré sur la figure 7, un isolant d'encoche 46 est positionné autour des branches 361 , 362 des conducteurs. En l'occurrence, cet isolant 46 présente une section en forme de S. Cet isolant permet de ne pas blesser les conducteurs 36 (revêtus de la mince couche d'émail 360) lors de leur montage dans le paquet de tôles du rotor 30 doté par définition de bavures et cannelé pour montage à force du paquet de tôles du rotor. Cela isole également électriquement les conducteurs 36 par rapport au paquet de tôles relié à la masse via le carter du démarreur. En outre, le jeu entre l'isolant 46 et les bords des encoches 33 est comblé par un vernis d'imprégnation. As shown in Fig. 7, a notch insulator 46 is positioned around the limbs 361, 362 of the leads. In this case, this insulator 46 has an S-shaped section. This insulator makes it possible not to harm the conductors 36 (coated with the enamel thin layer 360) during their assembly in the bundle of sheets of the rotor 30 equipped with by definition of burrs and fluted for force fitting of the rotor plate package. This also electrically insulates the conductors 36 from the grounded package of sheets via the starter housing. In addition, the clearance between the insulator 46 and the edges of the notches 33 is filled with an impregnating varnish.
Des frettes 49, 50 en matière électriquement isolante visibles sur la figure 1 sont enfilées autour des chignons 43, 44. Ainsi, une première frette 49 est enfilée autour du chignon 43 situé du côté du collecteur 37 et formé notamment par les extrémités des branches des conducteurs 36. Une deuxième frette 50 est enfilée autour du chignon 44 situé du côté opposé et formé notamment par les fonds 363 et une partie des branches 361 , 362 des conducteurs 36 situées à proximité des fonds 363. Frets 49, 50 of electrically insulating material visible in Figure 1 are threaded around the buns 43, 44. Thus, a first band 49 is threaded around the bun 43 located on the side of the collector 37 and formed in particular by the ends of the branches of the conductors 36. A second hoop 50 is threaded around the bun 44 located on the opposite side and formed in particular by the funds 363 and a portion of the branches 361 , 362 of the conductors 36 located near the bottoms 363.
Ces frettes 49, 50 montrées en détails sur les figures 4a à 4c maintiennent radialement les conducteurs 36 pour éviter que les effets de la force centrifuge s'exercent sur les chignons 43, 44. Chaque frette 49, 50 est munie de moyens de retenue 48 de la frette axialement par rapport au corps 31 et en rotation par rapport à un axe Y de la frette 49, 50. Cet axe Y est sensiblement confondu avec l'axe X du rotor lorsque la frette 48, 49 est positionnée autour du chignon 43, 44 du bobinage correspondant. These frets 49, 50 shown in detail in FIGS. 4a to 4c radially hold the conductors 36 to prevent the effects of the centrifugal force acting on the buns 43, 44. Each band 49, 50 is provided with retaining means 48. of the hoop axially relative to the body 31 and in rotation relative to a Y axis of the hoop 49, 50. This Y axis is substantially coincident with the X axis of the rotor when the hoop 48, 49 is positioned around the bun 43 , 44 of the corresponding winding.
Plus précisément, ces frettes 49, 50 présentent une paroi annulaire 51 d'orientation axiale ayant une périphérie interne 52 destinée à être plaquée contre une périphérie externe du chignon 43, 44 correspondant et une périphérie externe 53 tournée vers l'extérieur de la frette. La périphérie interne 52 et la périphérie externe 53 sont reliées par des bords 54, 55 d'extrémités axiales. Un des bords 54 est destiné à être positionné à proximité d'une face d'extrémité 312, 313 du rotor 30 tandis que l'autre bord 55 est destiné à être positionné axialement du côté opposé. More specifically, these frets 49, 50 have an annular wall 51 of axial orientation having an inner periphery 52 intended to be pressed against an outer periphery of the bun 43, 44 corresponding and an outer periphery 53 facing outwardly of the hoop. The inner periphery 52 and the outer periphery 53 are connected by edges 54, 55 of axial ends. One of the edges 54 is intended to be positioned near one end face 312, 313 of the rotor 30 while the other edge 55 is intended to be positioned axially on the opposite side.
Dans le mode de réalisation des figures 4a à 4c et de la figure 6a, les moyens de retenue 48 comportent des ouvertures traversantes 63 pour le passage du vernis d'imprégnation ménagées dans la paroi 51 . Ces ouvertures 63 ont un axe Z d'orientation radiale par rapport à l'axe Y de la paroi de la frette 49, 50. In the embodiment of FIGS. 4a to 4c and of FIG. 6a, the retaining means 48 comprise through-openings 63 for the passage of the impregnation varnish formed in the wall 51. These openings 63 have a Z axis radially oriented relative to the Y axis of the wall of the hoop 49, 50.
Ainsi, comme cela est bien visible sur la figure 6a, le vernis d'imprégnation pourra pénétrer à l'intérieur des ouvertures 63 jouant un rôle de moule pour former des saillies 64 dans la couche de vernis 68 située au niveau de la périphérie externe du chignon 43, 44. Ces saillies 64 ont une forme complémentaire des ouvertures 63. Ainsi, les frettes 49, 50 seront retenues axialement et en rotation par les saillies 64 en prise avec les ouvertures 63. A cet effet, on utilise un vernis par exemple à base de résine epoxy applicable à chaud qui se rigidifie au cours de sa polymérisation. Autrement dit, les ouvertures 63 ménagées dans la paroi 51 des frettes 49, 50 agissent comme un verrou axial et bloquent en rotation les frettes 49, 50 qui sont retenues par le vernis d'imprégnation polymérisé pénétrant à l'intérieur des ouvertures 63. Une telle liaison mécanique entre la frette 49, 50 et la couche de vernis permet de monter chaque frette 49, 50 autour du chignon 43, 44 correspondant soit avec un jeu positif soit avec un jeu négatif correspondant à un serrage moindre que dans les systèmes existants en sorte qu'il existe un léger espace entre les conducteurs 36 voisins des chignons comme cela ressort clairement de la figure 5a. Cela permet d'assurer une migration du vernis d'imprégnation 68' à l'intérieur des chignons 43, 44 et donc une bonne isolation entre les conducteurs 36 comme montré sur la figure 5b. Thus, as is clearly visible in FIG. 6a, the impregnating varnish can penetrate inside the openings 63 acting as a mold to form projections 64 in the varnish layer 68 situated at the outer periphery of the 43, 44. These projections 64 have a shape complementary to the openings 63. Thus, the frets 49, 50 will be retained axially and in rotation by the projections 64 in engagement with the openings 63. For this purpose, a varnish is used for example based on heat-resistant epoxy resin which stiffens during its polymerization. Other said openings 63 formed in the wall 51 of the hoop 49, 50 act as an axial lock and block in rotation the hoop 49, 50 which are retained by the polymerized impregnating varnish penetrating inside the openings 63. Such mechanical connection between the band 49, 50 and the varnish layer makes it possible to mount each band 49, 50 around the bun 43, 44 corresponding either with a positive clearance or with a negative clearance corresponding to a lower clamping than in the existing systems so that there is a slight gap between the neighboring conductors 36 of the buns as is clear from Figure 5a. This ensures a migration of the impregnating varnish 68 'inside the buns 43, 44 and therefore good insulation between the conductors 36 as shown in Figure 5b.
En l'occurrence, chaque frette 49, 50 comporte six ouvertures 63 espacées angulairement de manière régulière autour de la paroi 51 de la frette 49, 50. II existe ainsi un écart angulaire A de l'ordre de 60 degrés entre deux ouvertures 63 consécutives (cf. figure 4c). Bien entendu, le nombre d'ouvertures 63 pourra varier en fonction de l'application. En variante, les ouvertures 63 ne sont pas traversantes. En variante, les ouvertures 63 présentent un axe Z d'orientation axial par rapport à l'axe Y de la paroi 51 en prenant par exemple la forme d'ouvertures allongées de forme rectangulaire s'étendant entre les bords 54, 55 de la paroi annulaire 51 des frettes. In this case, each band 49, 50 comprises six openings 63 spaced angularly in a regular manner around the wall 51 of the band 49, 50. There is thus an angular gap A of the order of 60 degrees between two consecutive openings 63 (see Figure 4c). Of course, the number of openings 63 may vary depending on the application. Alternatively, the openings 63 are not through. In a variant, the openings 63 have a Z axis that is axially oriented with respect to the Y axis of the wall 51, for example taking the form of elongated openings of rectangular shape extending between the edges 54, 55 of the wall annular 51 frets.
De préférence, les frettes 49, 50 et les chignons 43, 44 sont montés entre eux avec un jeu compris de préférence entre plus 0.15mm et moins 0.14mm. Un jeu positif implique que la frette 49, 50 présente un diamètre interne D1 plus grand que le diamètre externe D2 du chignon 43, 44 correspondant (les chignons 43 et 44 pouvant avoir des diamètres externes D2 différents) tandis qu'un jeu négatif implique que la frette 49, 50 présente un diamètre interne D1 plus petit que le diamètre externe D2 du chignon 43, 44 correspondant. Toutefois, dans certaines applications, il est possible d'augmenter le serrage jusqu'à des jeux négatifs de l'ordre de moins 0.25mm. Preferably, the frets 49, 50 and the buns 43, 44 are mounted between them with a clearance preferably between 0.15 mm and 0.14 mm less. Positive play means that the hoop 49, 50 has an internal diameter D1 larger than the external diameter D2 of the corresponding bun 43, 44 (the buns 43 and 44 may have different external diameters D2) while a negative play means that the hoop 49, 50 has an internal diameter D1 smaller than the external diameter D2 of the bun 43, 44 corresponding. However, in some applications, it is possible to increase the clamping up to negative clearance of less than 0.25mm.
De préférence, la frette 49, 50 présente un diamètre interne D1 compris entre 47.55mm et 47.65mm; tandis que le chignon présente un diamètre externe D2 (cf. figure 1 ) compris entre 47.5mm et 47.8mm. Dans l'exemple de réalisation particulier montré sur la figure 4b, chaque frette 49, 50 présente un diamètre interne D1 de l'ordre de 47.6mm, une largeur L1 de l'ordre de 5mm et une épaisseur L2 de l'ordre de 1 mm. Les ouvertures 63 présentent un diamètre L3 de l'ordre de 2.5mm. Dans un autre mode de réalisation montré sur la figure 6b, les moyens de retenue 48 comportent des protubérances 69 en remplacement ou en complément des ouvertures 63. Ces protubérances 69 prennent par exemple la forme de tige cylindrique de faibles dimensions issue de la périphérie interne 52 de la paroi de la frette 49, 50 et dirigée vers l'intérieur de la frette 49, 50. Ainsi, au cours de la phase d'imprégnation, les frettes 49, 50 vont imposer à la couche de vernis 68 une forme telle que les protubérances 69 vont pénétrer à l'intérieur de creux 70 de la couche de vernis 68. Ainsi, les frettes 49, 50 seront retenues axialement et en rotation par rapport à l'axe Y par lesdites protubérances 69 en prise avec les creux 70 après polymérisation de la couche de vernis 68. Preferably, the hoop 49, 50 has an internal diameter D1 of between 47.55mm and 47.65mm; while the bun has an outer diameter D2 (see Figure 1) between 47.5mm and 47.8mm. In the particular exemplary embodiment shown in FIG. 4b, each band 49, 50 has an internal diameter D1 of the order of 47.6 mm, a width L1 of the order of 5 mm and a thickness L 2 of the order of 1. mm. The openings 63 have a diameter L3 of the order of 2.5 mm. In another embodiment shown in FIG. 6b, the retaining means 48 comprise protuberances 69 in place of or in addition to the openings 63. These protuberances 69 take for example the shape of a cylindrical rod of small dimensions originating from the inner periphery 52 of the wall of the band 49, 50 and directed towards the inside of the band 49, 50. Thus, during the impregnation phase, the bands 49, 50 will impose on the layer of varnish 68 a shape such that the protuberances 69 will penetrate inside recesses 70 of the lacquer layer 68. Thus, the frets 49, 50 will be retained axially and in rotation relative to the axis Y by said protuberances 69 in engagement with the recesses 70 after polymerization of the lacquer layer 68.
De préférence, les frettes 49, 50 sont réalisées dans un matériau électriquement isolant. En outre les frettes 49, 50 sont avantageusement réalisées en un seul tenant, c'est-à-dire qu'il existe une continuité de matière entre les différentes zones d'une frette 49, 50. Par ailleurs, comme cela est visible sur la figure 1 , une troisième frette 75 assure une retenue radiale des conducteurs 36 pour éviter que les effets de la force centrifuge s'exercent sur les soudures des extrémités des conducteurs 36 entre elles et sur les lames 39 du collecteur 37. Preferably, the frets 49, 50 are made of an electrically insulating material. In addition, the frets 49, 50 are advantageously made in one piece, that is to say that there is continuity of material between the different zones of a band 49, 50. Moreover, as is visible on 1, a third band 75 provides radial retention of the conductors 36 to prevent the effects of the centrifugal force on the solder ends of the conductors 36 between them and on the blades 39 of the manifold 37.
Le rotor 30 pourra comporter à une extrémité de son arbre 32 une roue d'engrenage 78 située du côté opposé du collecteur 37 et destinée à former un planétaire dans un système de réduction de vitesse à train épicycloïdal d'un démarreur, comme décrit par exemple dans le document FR2787833. The rotor 30 may comprise at one end of its shaft 32 a gear wheel 78 located on the opposite side of the collector 37 and intended to form a sun gear in a planetary gear reduction system of a starter, as described for example in the document FR2787833.
L'invention a également pour objet la machine électrique équipée du rotor 30 précédemment décrit. The invention also relates to the electric machine equipped with the rotor 30 described above.

Claims

REVENDICATIONS
1 . Rotor (30) bobiné comportant 1. Rotor (30) wound comprising
- un corps (31 ) de forme cylindrique monté sur un arbre (32),  a body (31) of cylindrical shape mounted on a shaft (32),
- un collecteur (37) comprenant un ensemble de lames (39) électriquement conductrice,  a collector (37) comprising a set of electrically conductive blades (39),
- des encoches (33) ménagées longitudinalement sur une périphérie externe du corps (31 ) du rotor, et  - notches (33) formed longitudinally on an outer periphery of the body (31) of the rotor, and
- un bobinage formé par un ensemble de conducteurs (36) insérés au moins en partie à l'intérieur des encoches (33) et reliés électriquement aux lames (39) du collecteur (37), des parties des conducteurs (36) s'étendant en saillie par rapport à des faces radiales d'extrémité axiale du corps du rotor constituant des chignons (43, 44) du bobinage,  - a winding formed by a set of conductors (36) inserted at least partly inside the notches (33) and electrically connected to the blades (39) of the collector (37), portions of the conductors (36) extending protruding with respect to radial axial end faces of the rotor body constituting bunches (43, 44) of the winding,
caractérisé en ce qu'il comporte en outre au moins une frette (49, 50) montée axialement par rapport au corps (31 ) autour d'un chignon (43, 44) ayant une paroi (51 ) annulaire munie de moyens de retenue (48) de la frette pour solidariser la frette au chignon axialement et en rotation par rapport à un axe (Y) de la frette (49, 50).  characterized in that it further comprises at least one hoop (49, 50) mounted axially with respect to the body (31) around a bun (43, 44) having an annular wall (51) provided with retaining means ( 48) of the hoop to join the hoop to the bun axially and in rotation with respect to an axis (Y) of the hoop (49, 50).
2. Rotor selon la revendication 1 , caractérisé en ce que les moyens de retenue (48) de la frette (49, 50) sont destinés à imposer une forme à une couche de d'imprégnation (68) située en périphérie du chignon (43, 44) telle que la frette (49, 50) est retenue par ladite couche d'imprégnation (68). 2. Rotor according to claim 1, characterized in that the retaining means (48) of the hoop (49, 50) are intended to impose a shape on an impregnating layer (68) located on the periphery of the bun (43). 44) such that the hoop (49, 50) is retained by said impregnation layer (68).
3. Rotor selon la revendication 2, dans lequel la couche d'imprégnation est une couche de vernis d'imprégnation sur l'ensemble du rotor pour rigidifier ledit rotor. 4. Rotor selon la revendication 2 ou 3, caractérisé en ce que les moyens de retenue (48) comportent au moins un trou (63) réalisé dans la paroi (51 ) de la frette (49, 50) pour le passage de la couche d'imprégnation de sorte que la couche d'imprégnation (68) présente au moins une saillie (64) pénétrant à l'intérieur du trou (63). 5 Rotor selon la revendication 4, caractérisé en ce que le trou est une ouverture (63) est traversante. 3. Rotor according to claim 2, wherein the impregnating layer is a layer of impregnating varnish on the rotor assembly for stiffening said rotor. 4. Rotor according to claim 2 or 3, characterized in that the retaining means (48) comprise at least one hole (63) formed in the wall (51) of the hoop (49, 50) for the passage of the layer impregnation so that the impregnation layer (68) has at least one projection (64) penetrating inside the hole (63). 5 rotor according to claim 4, characterized in that the hole is an opening (63) is through.
6. Rotor selon la revendication 5 ou 4, caractérisé en ce que le trou (63) présente un axe (Z) orienté radialement par rapport à l'axe (Y) de la frette (49, 50). 6. Rotor according to claim 5 or 4, characterized in that the hole (63) has an axis (Z) oriented radially relative to the axis (Y) of the hoop (49, 50).
7. Rotor selon l'une des revendications 4 à 6, caractérisée en ce que les moyens de retenue comportent une pluralité d'ouvertures (63) espacées angulairement de manière régulière autour de la paroi (51 ) de la frette. 7. Rotor according to one of claims 4 to 6, characterized in that the retaining means comprise a plurality of openings (63) spaced angularly in a regular manner around the wall (51) of the hoop.
8. Rotor selon l'une des revendications 2 à 7, caractérisé en ce que les moyens de retenue (48) comportent au moins une protubérance (69) destinée à pénétrer à l'intérieur d'au moins un creux (70) de la couche de vernis d'imprégnation (68). 8. Rotor according to one of claims 2 to 7, characterized in that the retaining means (48) comprise at least one protrusion (69) intended to penetrate inside at least one recess (70) of the impregnating varnish layer (68).
9. Rotor selon l'une des revendications 1 à 8, caractérisé en ce que la frette (49, 50) et le chignon (43, 44) sont montés entre eux avec un jeu compris entre plus 0.15mm et moins 0.14mm. 9. Rotor according to one of claims 1 to 8, characterized in that the hoop (49, 50) and the bun (43, 44) are mounted between them with a clearance between plus 0.15mm and 0.14mm less.
10. Rotor selon l'une des revendications 1 à 9, caractérisé en ce que la frette (49, 50) présente un diamètre interne (D1 ) compris entre 47.55mm et10. Rotor according to one of claims 1 to 9, characterized in that the hoop (49, 50) has an inner diameter (D1) of between 47.55mm and
47.65mm tandis que le chignon (43, 44) présente un diamètre externe (D2) compris entre 47.5mm et 47.8mm. 47.65mm while the bun (43, 44) has an outer diameter (D2) of between 47.5mm and 47.8mm.
1 1 . Rotor selon l'une des revendications 1 à 10, caractérisé en ce que la frette (49, 50) est réalisée dans un matériau électriquement isolant. 12. Rotor selon l'une des revendications 1 à 1 1 , caractérisé en ce qu'il comporte deux frettes (49, 50) positionnées chacune autour d'un chignon. 1 1. Rotor according to one of claims 1 to 10, characterized in that the hoop (49, 50) is made of an electrically insulating material. 12. Rotor according to one of claims 1 to 1 1, characterized in that it comprises two frets (49, 50) each positioned around a bun.
13. Rotor selon quelconque des revendications précédentes, dans lequel deux portions des conducteurs entourée par la frette délimitées par le plan radial de la frette sont en contact par le biais d'une couche d'imprégnation. 13. Rotor according to any one of the preceding claims, wherein two portions of the conductors surrounded by the hoop delimited by the radial plane of the hoop are in contact through an impregnating layer.
14. Machine électrique caractérisée en ce qu'elle comporte un rotor (30) selon l'une des revendications précédentes. 14. Electric machine characterized in that it comprises a rotor (30) according to one of the preceding claims.
EP14713555.2A 2013-03-14 2014-03-12 Electrical machine rotor provided with at least one hoop for retaining the turns of the winding and corresponding electrical machine Withdrawn EP2973952A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1352249A FR3003412B1 (en) 2013-03-14 2013-03-14 ELECTRIC MACHINE ROTOR PROVIDED WITH AT LEAST ONE WELDING CHUNK HOLDING FREIGHT AND CORRESPONDING ELECTRIC MACHINE
PCT/FR2014/050557 WO2014140477A1 (en) 2013-03-14 2014-03-12 Electrical machine rotor provided with at least one hoop for retaining the turns of the winding and corresponding electrical machine

Publications (1)

Publication Number Publication Date
EP2973952A1 true EP2973952A1 (en) 2016-01-20

Family

ID=48521291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14713555.2A Withdrawn EP2973952A1 (en) 2013-03-14 2014-03-12 Electrical machine rotor provided with at least one hoop for retaining the turns of the winding and corresponding electrical machine

Country Status (5)

Country Link
US (1) US20160020661A1 (en)
EP (1) EP2973952A1 (en)
CN (1) CN105009423B (en)
FR (1) FR3003412B1 (en)
WO (1) WO2014140477A1 (en)

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US11038394B2 (en) * 2018-01-25 2021-06-15 Ge Aviation Systems Llc Generator rotor with coil end-turn retention mechanism

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Also Published As

Publication number Publication date
FR3003412B1 (en) 2016-12-09
US20160020661A1 (en) 2016-01-21
CN105009423B (en) 2017-09-08
CN105009423A (en) 2015-10-28
FR3003412A1 (en) 2014-09-19
WO2014140477A1 (en) 2014-09-18

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