WO2013093292A1

WO2013093292A1 - Salient-pole rotor comprising a guide part for guiding winding wires, and associated guide part and winding method

Info

Publication number: WO2013093292A1
Application number: PCT/FR2012/052887
Authority: WO
Inventors: Frédéric BOUSSICOT; Jérémie Lutun
Original assignee: Valeo Equipements Electriques Moteur
Priority date: 2011-12-20
Filing date: 2012-12-12
Publication date: 2013-06-27
Also published as: FR2984627A1; FR2984627B1

Abstract

The invention essentially relates to a rotor (30) for a rotary electric machine (10), comprising: a rotor shaft (35) intended to be rotatably mounted about the axis (B) thereof; a stack (36) of laminations, mounted coaxially on the rotor shaft (35), said lamination stack (36) having a rotational axis (R) and comprising at least two radially salient poles (44); and an excitation winding (50) wound around each pole (44), such that axial end portions (51) of the winding, known as coil ends, project axially relative to each outer radial end face of the lamination stack (36). The rotor is characterised in that the stack also comprises a guide part (120) for guiding winding wires, positioned on an outer radial end face of the lamination stack (36), said guide part (120) comprising: a radial wall (121) provided with a main opening allowing the shaft (35) to pass therethrough; and at least one guide pin (125) which is positioned on an outer face of the radial wall (121) and which includes at least one side edge (126) that supports the winding wire, said guide pin (125) guiding the wire during the rotor winding operation and holding the wire in a fixed position once the rotor winding operation is complete.

Description

HIGH-LEVEL ROTOR COMPRISING A WINDING WIRE GUIDE PIECE, A WINDING WIRE GUIDE PART

AND ASSOCIATED WINDING METHOD

TECHNICAL FIELD OF THE INVENTION

The invention relates to a rotor with salient poles comprising a winding wire guide piece and a winding wire guide piece and an associated winding method.

[02] The invention finds a particularly advantageous application in the field of rotating electrical machines such as alternators, alternator-starters and electromagnetic retarders.

STATE OF THE ART

[03] WO 2007/003835 discloses a protruding poles rotor for a rotating electrical machine including an alternator or alternator-starter for a motor vehicle.

[04] It will be recalled that an alternator / starter is a rotating electrical machine able to work in a reversible manner, on the one hand, as an electric generator in alternator function and, on the other hand, as an electric motor in particular for starting the engine. of the motor vehicle.

[05] This machine essentially comprises a housing and, inside thereof, a rotor fixed in rotation with a central rotor shaft and an annular stator which surrounds the rotor coaxially with the shaft.

[06] The stator comprises a body in the form of a pack of sheets with notches, for example of the semi-closed type, for mounting a stator winding having a plurality of windings. This stator winding comprises for example a set of three-phase star or delta windings, the outputs of which are connected to a rectifier bridge comprising rectifying elements. [07] In general, the alternator is of the polyphase type and the rectifier bridge or bridges make it possible in particular to rectify the alternating current produced in the stator windings in a direct current, in particular for charging the battery of the motor vehicle and supplying the electric loads and consumers of the on-board network of the motor vehicle.

[08] The housing is in at least two parts, namely a front bearing and a rear bearing. The bearings are hollow in shape and each carries a central ball bearing respectively for the rotational mounting of the rotor shaft.

[09] The housing has an intermediate portion internally bearing the body of the stator. This intermediate portion is interposed axially between the bearings each having a plurality of openings for internal ventilation of the machine with at least one fan secured to one of the axial ends of the rotor. This fan has blades integral with a flange as described below.

[010] The rotor shaft carries at its front end a pulley which is arranged outside the housing. The pulley belongs to a motion transmission device via at least one belt between the alternator and the engine of the motor vehicle.

A pack of sheets is mounted coaxially on the rotor shaft in the housing, inside the stator. This bundle of sheets is formed of an axial stack of sheets which extend in a radial plane perpendicular to the axis of the rotor shaft. This bundle of plates comprises here a cylindrical central core and a circumferential distribution of arms projecting radially from the core.

[012] In a radial plane, the sheets of the sheet package all have an identical contour. The outline of the sheets is cut into a generally circular shape and having salient poles, which are regularly distributed in a radial direction and projecting from the shaft towards the outer periphery. The sheet package has at least two poles. [013] Each pole consists of an arm which, from the core, extends radially towards the outer periphery towards the stator. The free end of the pole ends with a return protruding circumferentially on either side of the arm. An annular gap exists between the free end of the poles and the inner periphery of the stator body.

[014] The function of the protruding return of each pole is to retain in the radial direction an electrically conductive excitation coil, which is wound around the radial arm of each pole, against the centrifugal force experienced by the excitation coil. when rotating the rotor. [015] The excitation windings of each pole are electrically interconnected by connecting son, for example in series. The excitation windings are electrically powered by a collector, which has slip rings, which are arranged around a rear end of the shaft. This collector is for example made by overmolding electrically insulating material on electrically conductive elements connecting the rings to a ring electrically connected by wire links to the ends of the rotor or excitation coils.

The slip rings are electrically powered by means of brushes which belong to a brush holder and which are arranged so as to rub on the slip rings. The brush holder is generally arranged in the housing and is electrically connected to a voltage regulator.

[017] Each excitation coil is wound around the radially oriented arm of each pole so that axial end portions of the excitation coil project axially with respect to each radial face of the external axial end of the package. of sheets. These protruding portions will subsequently be called "buns". Each pole thus comprises an excitation winding which itself comprises two opposite buns. [018] A first front flange and a second rear flange are mounted coaxially to the shaft so as to axially clamp the sheet of paper to keep the sheets stacked in a package. Each flange has globally the shape of a disk extending in a radial plane perpendicular to the axis of the shaft. Each flange has a central hole for coaxial mounting on the shaft.

[019] The flanges are arranged axially on either side of the plate package so that the inner radial faces of the flanges bear against the outer axial radial end faces of the sheet package. Each flange has four holes to allow the passage of four tie rods. The arms of the plate bundle have holes so that the tie rods can axially traverse the bundle of sheets from the front flange to the rear flange. The flanges are heat conductive material, for example metal.

[020] The outer peripheral edge of the flanges vis-à-vis the stator has axial grooves which are open in the radial inner and outer faces of the flanges. These grooves make it possible to renew the air which is included radially between the stator and the rotor. Each flange also has housings that are made in their inner radial face. These accommodations are intended to receive the salient buns. At least one of the housing of at least one flange has a contact surface with the outer radial face of the associated bun. Thus, when the buns are heated, their heat is transmitted to the flasks including conduction.

[021] For winding poles, it is known, as described in US2008 / 0277521 to use pads provided at one of their ends with a through groove, these pads being integrated on an outer face of a flange for the assembly of the poles. The grooves of the studs guide the wires according to the desired electrical configuration of the winding. However, such a configuration requires a high accuracy of the positioning of the wire inside the groove which complicates the winding process. In addition, such studs do not allow good maintenance of the son in a fixed position once the winding operation is complete. OBJECT OF THE INVENTION

[022] The invention aims to overcome these disadvantages by providing an improved projecting pole rotor equipped with a winding wire guide piece facilitating the winding operation while ensuring a good maintenance of the son once the operation completed.

[023] To this end, the invention relates to a rotating electric machine rotor comprising:

a rotor shaft intended to be rotatably mounted about its axis,

a bundle of plates mounted coaxially on the rotor shaft, this bundle of plates having an axis of rotation and comprising at least two radially projecting poles,

an excitation winding wound around each pole, so that axial end portions of the winding, said "buns" project axially with respect to each outer radial end face of the sheet package,

characterized in that it further comprises

a winding wire guide piece positioned on an outer radial end face of the sheet bundle, said guide piece comprising:

- a radial wall provided with a main opening allowing the passage of the shaft,

at least one guide pin positioned on an outer face of the radial wall, this guide pin having at least one lateral edge on which the winding wire bears, this guide pin ensuring the guiding of the wire during the operation winding the rotor and holding the wire in a fixed position once the rotor winding operation is complete.

[024] In one embodiment, the guide pin has a rectangular section with chamfered corners.

[025] In one embodiment, the guide member further comprises at least one end inner pin ensuring the attachment of an end of the winding wire. [026] In one embodiment, the inner end pin has a hook shape to maintain one end of the winding wire.

[027] According to one embodiment, the guide piece comprises a series of guide pins implanted generally on the same circumference on the outer face of the radial wall of the guide piece.

[028] In one embodiment, a set of two adjacent guide pins guiding the winding wire between the two windings of the two adjacent poles.

[029] In one embodiment, the winding wire of the winding of one of the poles being connected to two adjacent poles, a first set of two guiding pins guiding the winding wire between said pole and one of the adjacent poles, a second set of two guide pins guiding the winding wire between said pole and the other adjacent pole, these two sets of two guide pins having a common guide pin. [030] According to one embodiment, at least one winding wire is used to ensure the winding of all the poles of the rotor, an end internal pin is positioned at a first pole to be wound for the fixation of one of the ends of said winding wire and an inner end pin is positioned at the last pole to be wound for fixing the other end of said winding wire.

[031] In one embodiment, the guide member comprises at least two arms arranged regularly around the outer edge of the radial wall, these arms being held pressed against a radial end face of a pole protruding by a bun. [032] In one embodiment, each arm of the guide member has at its free end a cap extending circumferentially on either side of the arm, these caps being positioned between a bun and the annular flange of a flange.

[033] The invention further relates to a guide piece of winding son of a rotor of a rotating electrical machine positioned on a outer radial end face of the plate package, characterized in that it comprises:

- a radial wall provided with a main opening allowing the passage of the shaft,

at least one guide pin positioned on an outer face of the radial wall, this guide pin having at least one lateral edge on which the winding wire bears, this guide pin ensuring the guiding of the wire during the operation winding the rotor and holding the wire in a fixed position once the rotor winding operation is complete. [034] The invention furthermore relates to a method of winding rotating rotor machine poles characterized in that it comprises the following steps:

a step of fixing a first end of the winding wire to a first end internal pin,

a step of winding a first pole,

a step of positioning the wire against at least one lateral edge of two adjacent guide pins, to guide the wire between two adjacent poles,

a winding step of another pole,

a step of fixing a second end of the winding wire to a second end internal pin,

the step of positioning the wire and the winding step being repeated until all the poles are coiled.

BRIEF DESCRIPTION OF THE FIGURES

[035] The invention will be better understood by reading the following description and examining the figures that accompany it. These figures are given for illustrative but not limiting of the invention. They show :

[036] Figure 1 is an axial sectional view of a rotary electric machine provided with a rotor according to the invention; [037] Figure 2: an exploded perspective view of a rotor according to the invention which is not wound; [038] Figures 3a and 3b: perspective views of a wound rotor according to the invention without the flanges or the resolver;

[039] Figures 4a and 4b: views respectively of the top and bottom of a rotor according to the invention without the flanges or the resolver; [040] Figure 5: functional diagram showing the different steps of the winding method according to the invention;

[041] Figure 6 is a perspective view of the winding device of electric wire winding a pole of the rotor according to the invention.

[042] Identical, similar or similar elements retain the same reference from one figure to another.

DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION

[043] The invention relates to a rotor 30 with salient poles for a rotating electrical machine 10, in particular an alternator or an alternator-starter. This machine 10 is preferably intended to be implemented in a motor vehicle.

[044] It will be recalled that an alternator / starter is a rotating electrical machine able to work in a reversible manner, firstly, as an electric generator in alternator function and, secondly, as an electric motor in particular for starting the engine. of the motor vehicle. Such an alternator-starter is described for example in the document WO-A-01/69762 to which reference will be made for more details.

[045] This machine 10 essentially comprises a housing 1 1 and, inside thereof, a rotor 30 integral in rotation with a central rotor shaft and an annular stator 12 which surrounds the rotor 30 in a coaxial manner. to the shaft 35 of axis B also constituting the axis of the rotor 30.

[046] The stator 12 comprises a body in the form of a pack of sheets with notches, for example of the semi-closed type, for mounting a stator winding 13 having a plurality of windings. This stator winding 13 comprises for example a set of three-phase star windings or in the form of a triangle, the outputs of which are connected to a rectifier bridge (not shown) comprising rectifier elements comprising rectifying elements such as diodes or MOSFET transistors, in particular when the machine 10 is of the reversible type and consists of an alternator starter as described for example in document FR-A-2,745,445 (US-A-6,002,219).

[047] The windings of the stator winding 13 are obtained using a continuous, electrically conductive wire coated with an insulating layer and mounted in the relevant notches of the stator body 12. [048] According to a variant not shown, for better filling of the notches of the stator body 12, the windings 13 are made using bar-shaped conductors, such as pins, interconnected for example by welding.

[049] According to another variant not shown, to reduce the rate of ripple and magnetic noise, the stator winding 13 comprises two sets of three-phase windings to form a composite windings device stator 12, the windings being offset thirty electric degrees as described for example in US-A1-2002/0175589, EP-0,454,039 and FR-A-2,784,248. In this case, two rectifier bridges are provided and all combinations of three-phase star and / or delta windings are possible.

[050] In general, the alternator is of the polyphase type and the rectifier bridge makes it possible in particular to rectify the alternating current produced in the windings of the stator 12 into a direct current, in particular for charging the battery (not shown) of the motor vehicle and powering the loads and the electrical consumers of the onboard network of the motor vehicle.

[051] As illustrated in Figure 1, the shaft 35 of the rotor 30 is rotatably mounted about its axially oriented axis B in the stator 12 of the machine 10. [052] The housing 1 1 is in at least two parts, namely a front bearing 14 and a rear bearing 15. The bearings 14, 15 are of hollow form and each bear a ball bearing respectively 16 and 17 for the rotational mounting of the shaft 35 of the rotor 30. [053] The casing 11 comprises an intermediate portion (not referenced) internally bearing the body of the stator. This intermediate portion is interposed axially between the bearings 14, 15 each having a plurality of openings, one of which (not referenced) is visible in FIG. 1, for internal ventilation of the machine with the aid of a fan described in more detail below.

[054] The shaft 35 of the rotor 30 carries at its front end a pulley 18 which is arranged outside the housing 1 January. The pulley 18 belongs to a device for transmitting movements through at least one belt (not shown) between the alternator and the engine of the motor vehicle.

[055] Figure 2 shows the rotor 30 having the shaft 35, a bundle 36 of rotation axle plates R coaxially mounted on the shaft 35, this bundle 36 of sheets having at least two poles 44 radially projecting. The rotor 30 further comprises an excitation winding 50 (see FIGS. 3a-3b) wound around each pole 44, so that portions 51 of axial end of the winding 50, referred to as "buns", protrude axially relative to each other. at each face 40, 41 of the outer radial end of the pack 36 of sheets. Flanges 55, 56 for holding the package 36 of sheets and buns 51 of the coils 50 are arranged axially on either side of the package 36 of sheets. The flanges are advantageously metallic non-magnetic material, for example aluminum. The rotor 30 further comprises a guide piece 120 of winding wires. This piece 120 is made of electrically insulating material. It may be plastic such as PA 6.6. [056] More specifically, the package 36 of sheets is mounted coaxially on the rotor shaft 30 in the housing 1 1, inside the stator 12. The package 36 of sheets is mounted to rotate with the shaft 35. For this purpose, the bundle 36 of plates has a central axial orifice 37 which is fitted to on a knurled portion of the shaft 35. In a variant, the central core of the bundle 36 of metal sheets has an orifice 37 provided with recesses distributed in a regular circumferential manner to form tabs intended to cooperate with the corresponding knurling belonging to the 35 shaft in order to reduce the constraints during forced fitting of the shaft.

[057] The bundle 36 of sheets is formed of an axial stack of sheets which extend in a radial plane perpendicular to the axis B of the shaft 35. The bundle 36 of sheets forms the body of the rotor 30 and is in ferromagnetic material. This bundle 36 of plates here comprises a central cylindrical core and poles 44 projecting radially from the core. These poles 44 are in one embodiment in one piece with the soul. As a variant, the poles 44 are attached to the core, for example by a tenon-mortise type connection as described in document FR 2 856 532. One pole on every two or all of the poles 44 are attached to the core in such a way that to facilitate assembly and disassembly of the poles 44. Alternatively, a return 45 projecting from a pole 44 on two or 45 salient return of all the poles 44 is reported with respect to a corresponding arm 39.

[058] In the following description, radial faces oriented towards the middle of the pack 36 of sheets will be called internal faces while the radial faces oriented in an opposite direction will be called external faces. It is also considered that the rear side of the rotor 30 is located on the resolver 100 side while the front side is on the opposite side.

[059] Thus, the bundle 36 of sheets is delimited axially by the first external radial face 40 of the front end and the second opposite outer radial face 41 of the rear end.

[060] In a radial plane, the sheets of the pack 36 of sheets all have an identical contour. The contour of the sheets is cut in generally circular shape and has the salient poles 44, which are evenly distributed in a radial direction and projecting from the shaft 35 towards the outer periphery, as illustrated in FIGS. 4a-4b. The bundle 36 of plates has at least two poles 44 and in the example shown in FIGS. 4a-4b, it comprises twelve poles 44. As a variant it comprises eight or ten poles 44 see more. The number of poles 44 is equal to at least 8.

[061] Each pole 44 consists of an arm 39 and a salient return 45. The arm 39 extends radially from the core towards the outer periphery in the direction of the stator 12. The free end of the pole 44 terminates in the return 45 protruding circumferentially on either side of the arm 39. An annular air gap exists between the free end of the poles 44 and the inner periphery of the stator body 12.

[062] The function of the salient return 45 of each pole 44 is to retain in the radial direction an electrically conductive excitation coil 50, which is wound around the radial arm 39 of each pole 44 as described below, against the centrifugal force experienced by the excitation winding 50 during the rotation of the rotor 30.

[063] The excitation coils 50 of each pole 44 are electrically connected to each other by connecting son, for example in series alternately in parallel. The connecting son and windings 50 may be copper son covered with enamel. These excitation windings 50 are electrically powered by a collector 101, of the type of that described in the document FR 2 710 197 to which reference will be made, which comprises slip rings 102, which are arranged around a rear end of the This manifold 101 is for example made by overmolding electrically insulating material on electrically conductive elements (not visible) connecting the rings 102 to a ring (not referenced) electrically connected by wire links to the ends of the winding or coils 50. The collector has tabs (one of which is referenced 198 in FIG. 4a). In this Figure 4a the tabs 198 are not yet folded to clamp the ends of the son of the coils 50.

[064] The slip rings 102 are electrically powered by means of brushes (not shown) which belong to a brush holder and which are arranged so as to rub on the slip rings 102. The brush holder is generally arranged in the housing 1 1 and is electrically connected to a voltage regulator (see Figure 1). [065] Advantageously, for increasing the power of the electric machine, the rotor 30 further comprises magnets referenced 105 in Figures 4a-4b in a number equal to the number of poles (in this case twelve). The magnets 105 extend axially in the vicinity of the outer periphery of the rotor 30 between two returns 45. Thus the magnets 105 are arranged regularly around the shaft 35 alternately with the poles 44. For this purpose, each magnet 105 is positioned between two adjacent salient poles 44, the free ends of the two salient poles 44 being provided with notches holding the magnet 105 immovably between the two poles. The same notch may contain one or a plurality of magnets 105, for example two magnets 105 including a rare earth and a ferrite.

[066] The rotor 30 has at least two poles 44 diametrically opposed. In Figures 4a-4b there is provided a circumferential alternation of twelve poles 44 and twelve magnets 105. The number of poles 44 and the number of magnets 105 are variable depending on the application. An embodiment without magnets 105 may be provided. In another embodiment, the number of magnets 105 is smaller than the number of poles 44. All these arrangements make it possible to increase the power of the machine at will. For simplicity, without limitation, it will be assumed in the following that there are twelve diametrically opposed poles 44, twelve coils 50 and twelve magnets 105. The poles 44 and the magnets 105 are distributed circumferentially in a regular manner.

[067] More precisely in Figures 4a-4b the magnets 105 are mounted between the projecting returns 45 of two salient poles 44, said returns 45 having notches in the form of U-shaped profile grooves, as described for example in FR 2 784 248. The mounting of the magnets 105 in at least one groove can therefore be achieved using a blade and interposition of a softer glue than the magnet 105. Alternatively the magnets 105 are mounted in the grooves using springs. [068] In general, a low clearance, called gap, exists between the outer periphery of the poles 44 and the inner periphery of the stator body 12.

[069] As shown in Figure 3a, the rotor 30 further comprises a guide piece 120 positioned on an outer radial end face of the sheet package 36. This guide member 120 comprises a radial wall 121 provided with a main opening allowing the passage of the shaft 35 and at least one guide pin 125 positioned on an outer face of the radial wall 121 having at least one side edge 126 on which the winding wire 50 bears, this pin 125 ensuring the guiding the wire during the operation of winding the rotor 30 and maintaining the wire in a fixed position once the winding operation of the rotor 30 is complete. The guide piece is made of electrically insulating material. Here it is made of plastic material such as PA 6.6 [070] The guide piece 120 is positioned on an outer radial end face of the sheet bundle 36. This guide piece 120 comprises (FIG. 4a) a radial wall 121 provided with a main opening allowing the passage of the shaft 35 and at least one guide pin 125 positioned on an outer face of the radial wall 121 having at least one lateral edge 126 on which the winding wire 50 bears, this pin 125 guiding the wire during the winding operation of the rotor 30 and maintaining the wire in a fixed position once the winding operation of the rotor 30 is complete.

[071] The guide piece 120 further comprises at least one internal end pin 130. In one embodiment the pin 130 is identical to the pin 125. In another embodiment the pin 130 is hook-shaped for fixing one end of the winding wire.

[072] The pins 125, 130 are integral with the wall 121 being in this molded embodiment with the wall 121 of the part 120. They are protruding in the direction opposite to the package of sheets 36. The pin 130 is implanted inside the pin 125, that is to say on a circumference of smaller diameter than that of the pin 125. [073] In this embodiment, as best seen in Figure 4a, the pin 125 comprises four edges 126 and an upper face 127 constituting the top face of the pin 125 salient. Two of the edges 126 constitute the lateral edges of the pin 125 and the two other edges respectively the upper longitudinal edge and the lower longitudinal edge of the pin. The lateral edges are parallel to each other. It is the same for the upper and lower edges. This pin 125 thus has a section of rectangular shape. Advantageously the edges of the edges 126 are rounded and the corners of the pin 125, that is to say the free end of the edges 126, are chamfered not to hurt the portions of connecting son between two consecutive windings 50. The internal end pin 130 comprises, in the hook-shaped embodiment, an upper portion 131 extending in a direction substantially parallel to the radial wall 121 of the guide piece 120 and a lower portion 132, connecting the part 131 greater than the wall 121, this lower portion 132 extending in a direction substantially perpendicular to the radial wall 121 of the guide piece 120.

[074] In one embodiment of the invention, the winding of the twelve poles 44 is made so as to mount in parallel the first six adjacent poles 44 of the rotor 30 relative to the last six adjacent poles 44. The coils 50 of the first six adjacent poles 44 are then constituted by a first winding wire and the coils 50 of the six adjacent poles 44 next consist of a second winding wire. Two winding operations are therefore performed for this rotor 30. By adjacent poles 44 is meant two poles 44 positioned side by side, each pole 44 having a face facing one another.

[075] The guide piece 120 comprises in this embodiment a series of eighteen guide pins 125 implanted generally on the same circumference on the outer face of the radial wall 121 and four internal end pins 130 radially offset to the inside relative to the other pins 125 for the parallel assembly of the coils 50.

[076] More specifically, two end internal pins 130 are disposed on either side of each lug 198. In FIG. 4a, the ends of the connecting wires between the terminals are cut for greater clarity. These ends are wound around the internal pins 130 and intended to be fixed by crimping in the tabs 198. Thus an internal end pin 130 is positioned on the outer face of the radial wall 121 at the first pole 44 to which the first winding operation is carried out for fixing one of the ends of the first winding wire and an internal end pin 130 is positioned on the outer face of the radial wall 121 at the last pole 44 for which the first Winding operation is performed for fixing the other end of the first winding wire. Similarly, an internal end pin 130 is positioned on the outer face of the radial wall 121 at the first pole 44 for which the second winding operation is performed for fixing one of the ends of the second winding wire and an internal end pin 130 is positioned on the outer face of the radial wall 121 at the last pole 44 for which the second winding operation is performed for fixing the other end of the second winding wire.

[077] In addition, the guide pins 125 are distributed in a set of two adjacent pins 125 for guiding the connecting coil wire between the two coils 50 of two adjacent poles 44. By adjacent pins 125 is meant pins 125 positioned side by side on the periphery of the outer face of the radial wall 121 of the guide piece 120. The connecting wire between two adjacent poles is supported on one side. lateral edges of one of the pins and on the other lateral edge 126 of the other adjacent pin (Figure 4a).

[078] Thus for one pole out of two, two sets of two pins 125 are positioned at the outer periphery of the outer face of the radial wall 121, the first assembly ensuring the guiding of the connecting coil wire between said pole 44 and one of the adjacent poles 44, the second set guiding the winding wire between said pole 44 and the other adjacent pole 44, these two sets of two pins 125 having a pin 125 in common.

[079] As shown in Figure 4a the ends of each coil 50 are then in contact with the edges 126 of two adjacent adjacent pins 125 for a continuous connection of the coils 50. The Lower longitudinal edges of the guide pins radially retain the connecting wire between two consecutive windings 50. The assembly thus has a good performance despite the action of the centrifugal force. Of course when the windings 50 are mounted in series two internal pins 130 are sufficient. [080] It will be appreciated that the aforementioned solution 125 pins ensures continuity between the different coils 50, which are all at the same potential. The coils 50 can be made using a centrally hollow needle for passage of the wire and which moves circumferentially, axially and radially. This needle switches to move from one pawn 125 to another. Of course, in a variant, the internal pins 130 can be removed and the ends of the wires can be fixed directly on the tabs 198.

[081] In one embodiment, the guide piece 120 is integrated with an insulating element 82 of a device 80 for electrically insulating the windings 50 with respect to the sheet metal bundle 36, this bundle of sheets further comprising another insulating element 81. The insulating element is also made of plastic material such as PA 6.6. The first insulating element 81, referred to as the front element 81, is positioned against the outer radial face 40 of the sheet package 36, whereas the second insulating element 82, referred to as the rear element 82, is positioned against the outer radial face 41 of the package 36 of the sheets. These insulating elements 81, 82 ensure the electrical insulation of the buns 51 of the windings 50. The winding isolation device 80 further comprises notch insulators 83 ensuring the electrical insulation of the axial portions of the windings 50.

[082] More specifically, the insulating element 81 comprises a central radial wall 85 provided with a main opening 86 allowing passage of the shaft 35. The element 81 comprises arms 88 extending radially from the outer edge the wall 85 radially outwardly of the element 81. The element 82 has arms 88 extending radially from the outer edge of the guide piece 120 towards the outside of the element 82. Each of these arms 88 has at its free end a cap 89 extending circumferentially. on both sides of the arm 88. The cap 89 also extends axially in the opposite direction to the sheet package 36 and at the inner periphery of the returns 45. [083] The arms 88 of the elements 81, 82 insulators preferably have, on their outer face, grooves ensuring a radial retention of the turns of the coils 50. The grooves of the arms 88 of the element 81 forward insulation are inclined to facilitate the change of rank during the winding operation of winding a conductive wire around the different poles to obtain the coils 50 to turns.

[084] The radial wall 85 and the guide piece 120 further comprise two recessed portions 91 intended to receive internal sectors 79 of one of the holding flanges 55, 56. For the rear insulating member 82, the recessed portions 91 are diametrically opposed. Of course, the number and shape of the recessed portions 91, in particular the opening angle and the annular gap between two recessed portions 91, may be adapted according to the number and shape of the corresponding sectors 79. For the front insulating element 81, the recessed portions 91 and the main aperture 86 are interconnected, the internal walls delimiting the orifice being intended to bear locally on the outer circumference of the shaft 35.

[085] The insulating element 82 rear comprises an annular flange 96 defining the main opening 86. This annular flange 96 extends axially from the outer face of the insulating element 82 towards the outside of the rotor 30. When the rotor 30 is mounted, the flange 96 is situated between the collector 101 and a shoulder of the shaft 35. of the rotor 30.

[086] The insulating elements 81, 82 each comprise two devices 98 snap (clipping) for cooperating by snapping (clipping) with corresponding openings formed on each radial end face of the core of the package 36 of plates .

[087] The notch insulators 83 take the form of a thin membrane, made of an electrically insulating and heat-conducting material, for example an aramid material of the so-called Nomex (registered trademark) type, this thin membrane being folded in such a manner each notch insulator 83 is pressed against the axial inner walls of the plate package 36 between two adjacent poles 44. For this purpose, the notch insulation 83 has five parts 1 10 -1 14, each part 1 10-1 14 being folded with respect to an adjacent part along a folding segment substantially parallel to the axis B of the rotor 30. A first portion 1 10 located towards the center of the rotor 30 is pressed against a portion of the outer circumference of the core located between two adjacent poles 44. Two parts 1 1 1, 1 12 facing one another are pressed against two faces facing each other of the arms 39 of the poles 44. Two parts 1 13, 1 14 are pressed against two portions of two returns 45 adjacent projections. The number of notching insulators 83 depends on the number of poles 44, to which it is equal. Here, the number of notch insulators 83 is twelve.

[088] Each excitation winding 50 comprises turns wrapped around the radially oriented arm 39 of each pole 44 covered with notch insulators 83 and the two arms 88 of the insulating elements 81, 82 each located at one end of this pole 44, so that the buns 51 of the excitation winding 50 project axially relative to each face 40, 41 of the outer radial end of the package 36 of sheets, as shown in Figures 3a-3b. More particularly, the outer radial face of each bun 51 is offset axially outwards with respect to the associated outer radial face 40, 41 of the sheet package 36. Each pole 44 thus comprises an excitation winding 50 which itself comprises two opposing buns 51. An interwinding space exists between two buns 51 and two successive coils 50. This space delimits an axial passage passing through the sheet metal bundle 36. It will be noted that the width of the buns 51 and the coils 50 is decreasing per layer going radially from the outer periphery to the inner periphery of the buns and coils.

[089] According to this winding, each bun 51 bears against the face of the cap 89 turned towards the bun 51. The cap 89 is held stationary relative to the pole 44 with the associated arm 88 pressed between a radial face of the pole 44 and the winding wire. The outer periphery of the cap 89 in combination with the inner periphery of the rim 75 of the flange thus allows to retain the buns 51 despite the centrifugal force caused by the rotation of the rotor 30 exerted on said buns 51.

[090] Cohesion of the winding turns 50 is performed using a small amount of impregnating varnish deposited on the buns and curing by polymerization. As a variant, the cohesion of the coils of the coils 50 is produced by means of an additional bonding layer deposited on the winding wire 50 in the form of an impregnating polymer, which cures by heating and polymerization, the heating being carried out for example by Joule effect following an electric current flowing in the winding.

[091] The first flange 55 for holding the sheet package 36, said front flange 55 and the second flange 56 for holding the sheet package 36, said rear flange 56, are mounted coaxially with the shaft 35 so as to grip axially the insulating elements 81, 82 and the package 36 of sheets, These flanges 55, 56 are of non-magnetic material being advantageously metallic to better evacuate the heat.

[092] Each flange 55, 56 has a radial wall 59 extending in a radial plane perpendicular to the axis B of the shaft 35. This radial wall 59 is provided with a main opening 60 allowing the passage of the shaft 35. The rear flange 56 has two recesses 61 diametrically opposed opening towards the opening 60. These recesses 61 of substantially square shape seen from above allow the passage each of a tab 198 of the collector 101.

[093] The radial wall 59 of each flange 55, 56 has an annular flange 75 extending over the entire outer periphery of the radial wall 59 and extending axially towards the center of the rotor 30. This annular rim 75 face resting on the outer radial end faces of the returns 45 of the poles 44 so that the caps 89 of the elements 81, 82 insulating are sandwiched between an inner annular face of the flange 75 and the buns 51. Such a configuration allows the flanges 55, 56 to participate with the caps 89 in maintaining the buns 51 despite the centrifugal force caused by the rotation of the rotor 30. In a variant, it would also be possible to use only the rim 75 annular flanges 55, 56 to keep the buns 51 in position. In this case the elements 51, 52 insulators are therefore without caps 89.

[094] The outer face of the wall 59 of each flange 55, 56 carries blades 70 forming a fan. Each blade 70 extends axially towards the outside of the rotor 30 from the outer radial face of the flange 55, 56 associated. Advantageously, for better heat dissipation, the blades 70 are made integral with the flange 55, 56 associated. Preferably, the blades 70 are arranged at the periphery of the outer radial face of the flange 55, 56 asymmetrically with respect to the axis B of the shaft 35 to increase the ventilation performance and reduce the noise when the rotor 30 turned.

[095] Alternatively, the blades 70 belong to a separate fan flange 55, 56. The use of flanges 55, 56 and separate fans makes it easy to adapt the fans according to the power of the machine 10 targeted. The flange 55, 56 and the fan are then fixed together by means of a fixing device formed for example by fixing elements associated with the flanges 55, 56 cooperating with the orifices of the fan. This fixing may be carried out using screws as in Figure 16 of US 6,784,586, alternatively by riveting or spot welding.

[096] At least one of the flanges may be devoid of blades 70. Alternatively the two flanges may be free of blades.

[097] Each flange 55, 56 further comprises a first series of through orifices 72 around the main opening 60, these orifices 72 having an opening angle at least equal to the angle between two successive poles 44 protruding . Here, this first series of orifices 72 comprises four orifices 72 having the same opening angle. Of course, it depends on the applications. The four orifices 72 of the front flange 55 are arranged in a regular manner around the main opening 60. Note that the orifices 72 do not have the same size of a flange 55 to another to create an asymmetry and achieve an axial flow of air between the coils 50.

[098] Each flange 55, 56 further comprises a second series of orifices 73 through, each orifice 73 of the second series being positioned between two successive blades 70. It is possible to provide such orifices 73 in all the zones separating two successive blades 70 or only in some of these zones depending on the ventilation circuit. wish. These orifices 73 have an opening angle smaller than the opening angle of the orifices 72 of the first series of orifices 72. Here, the second series of orifices 73 comprise fourteen orifices 73 of unequal size. In a variant, additional counterbores are provided in the image of countersinks 68 described below. These countersinks radially affect the outer periphery of the radial wall 59 and axially a portion of the flange 75. These countersinks can be located at the free spaces between two returns 45. Of course, it is possible to eliminate orifices 73 and replace them with facings. It all depends on the applications. The second set of orifices 73 may not have the same size from one flange to the other.

[099] It will be noted, as shown in Figures 4a and 4b, that the width of the buns 51 and the coils 50 is decreasing per layer radially from the outer periphery to the inner periphery of the bun 51. This results in the presence of an inter-rewinding space defining a through axial passage (not referenced) between two successive windings 50. The orifices 72 are vis-à-vis at least the inner periphery of an inter-coil space and therefore a passage between two successive windings. The orifices 72 of the flange 56 are wider circumferentially and radially than those of the flange 55. The orifices 73 are implanted radially outside the orifices 72, that is to say on a mean circumference greater than that of the first orifices, and this, on the one hand, in the vicinity of the outer periphery of at least one interbobinage space and therefore a passage and secondly, in the free zones between two blades 70 arranged asymmetrically to reduce noise. There is thus an asymmetry between the two flanges 55, 56 allowing axial circulation of the undisturbed air by the possible presence of the magnets 105 implanted at the outer periphery of the sheet package 36 between two returns 45 implanted outside the slots.

It is taken into account the presence of inter-rewinding spaces and thus axial passages passing between two windings 50 facing to implant the orifices 72, 73 and ensure air circulation inside the rotor. Note that the portions of the orifices 72, 73 facing a bun allow access to the inter-rewinding space because the flanges 55, 56 are hollow. When the rotor 30 rotates, the blades 70 and the two series of orifices 72, 73 and the countersinks and allow to evacuate stored heat including air circulation inside the machine 10. Next the ventilation circuit, the air coming from outside the rotor 30 will penetrate inside the rotor 30 through the orifices 72, 73 of a flange 55, 56 to then flow along the rotor 30 to the interior of the spaces between two successive poles 44 to then emerge on the opposite side via the orifices 72, 73 of the flange 55, 56 opposite. The flanges 55, 56 constitute, via their blades 70, internal fans, the bearings 14, 15 having, in known manner, air inlet and outlet openings. The number of orifices 72, 73, and countersinks, their dimensions, the number of blades 70, as well as their arrangement, may be adapted according to the desired ventilation circuit while maintaining the mechanical strength of the flanges 55, 56.

The radial wall 59 of each flange 55, 56 further has on its inner face facing the sheet package 36 two inner sectors 79 extending axially to the package 36 of sheets. The inner sectors 79 of the flange 55 are inserted into the recessed portions 91 of the radial wall 85 of the element 81 and the inner sectors 79 of the flange 56 are inserted into the recessed portions 91 of the guide piece 120. In one example these sectors 79 are constituted by two diametrically opposite portions of the same ring. The internal sectors 79 constitute axial stops for the core of the plate package 36.

The annular flange 75 of each flange 55, 56 comprises two centering pins 77 intended to cooperate with axial openings 66 formed in the salient poles 44. The pins 77 thus facilitate the angular positioning of the flanges 55, 56 during assembly.

In one embodiment the flanges 55, 56 nonmagnetic material are made of moldable material such as aluminum to remove heat, or alternatively plastic material advantageously reinforced with fibers.

The flanges 55, 56 are fixed to each other by tie rods 62 of axial orientation, which are here three in number. For this purpose each flange 55, 56 comprises three orifices 65 intended to allow the passage of Each tie rod 62. The tie rods 62 pass axially through the axial apertures 66 in the poles, the bundle 36 of sheets from the front flange 55 to the rear flange 56. These tie rods 62 are made of non-magnetic material, for example aluminum or stainless steel. The outer radial face of each flange 55, 56 comprises countersinks 68 to accommodate the ends of each tie 62. These countersinks 68 allow passage of air.

According to a not shown variant of the invention, the flanges comprise other cooling means such as at least one heat pipe implanted at a return 45. This heat pipe can be implanted through an orifice 65 free. The shaft may be a shaped shaft to form a heat pipe.

According to another aspect of the invention the orifices 65 for fixing the flange 55 before are tapped. The tie rods 62 comprise a threaded end which is screwed into the tapped holes of the front flange 55 when the rotor 30 is mounted. In a variant, the threaded end of the tie rod 62 is self-tapping so that the associated orifice 65 of the flange 55 is smooth. Alternatively, the end of the tie rod 62 is smooth and passes through the associated orifice 65 of the flange 55, the free end of the tie rod 62 being crushed in contact with the outer face of the flange 55 for fastening by riveting. In a variant, the tie rod 62 is replaced by a rod passing through the orifices 65 of the flanges 55, 56 and the plate pack 36, the axial ends of the rod being crushed in contact with the external faces of the flanges 55, 56 for fastening by riveting. . The rotor 30 includes a resolver 100 making it possible to know the rotational position of the rotor 30. The resolver 100 intervenes in particular when the machine 10 operates in motor mode (starter function), in order to be able to suitably adapt the voltage applied to the coils 50 of the stator 12 depending on the position of the rotor 30. In one example the resolver 100 is replaced by a magnetic target associated with a set of Hall effect sensors carried by a sensor holder. Specifically, the rear flange 56 is configured to carry a target holder which is intended to allow associated sensors to detect the angular position of the rotor 30. The sensors are carried by a sensor holder whose position is adjustable circumferentially. The reading of the target is here radial. The target holder with its target and the sensors secured to a sensor holder belong to means for monitoring the rotation of the rotor as described in document WO01 / 69762 to which reference will be made for more details.

In a variant, the alternator is not reversible and is therefore devoid of resolver or magnetic target.

The assembly of the rotor 30 is described below. The notch insulators 83 are each installed between two successive poles 44. Then, the insulating elements 81, 82 are fixed on the sheet metal package 36 by clipping (clipping) via the two devices 98. Each external radial end face of each pole 44 is then in direct contact with an arm 88 of a insulating element 81, 82 and the guide piece 120 is fixed on an outer radial end face of the sheet package 36.

The excitation windings 50 are then wound in turns around each pole 44 according to a method of winding poles 44 of the rotor 30 (see Figure 5). The invention takes advantage of the inter-winding spaces to make the windings.

Thus for each winding wire ensuring the winding of a subset of poles, this method of winding poles 44 of the rotor 30 comprises a step 150 of fixing a first end of the winding wire to a first pin 130 internal, a step 151 of winding a first pole 44, at least one step 152 of positioning the wire against at least one edge 126 of two adjacent pins 125, followed by a step 153 of winding a pole 44. A last step 154 of fixing a second end of the winding wire to a second inner pin 130 completes the process.

Of course alternatively, the step 150 of fixing a first end of the wire consists of a step of attachment to the tab 198 of the collector. It is the same for the last step 154. In a variant, the pin 130 is similar to the pin 125.

The step 152 of positioning the wire and the step 153 of winding a pole 44 are repeated until all of the poles 44 to be wound by the same wire is wound.

Here, the windings 50 of the first six poles 44 being constituted by a first winding wire and the windings 50 of the six following poles 44 being constituted by a second winding wire, the process is repeated twice, each time for six poles. The wire positioning step 152 and the pole winding step 153 are reiterated five times for each occurrence of the method.

During steps 151 and 153 of winding poles, the winding wire is wound around each pole 44 covered with notch insulation 83 and the two arms 88 of the elements 81, 82 insulators associated with this pole 44, the winding wire being guided and held by the grooves of the arms 88.

In one embodiment, the electric wire winding is performed by a wire winding device 170 shown in FIG. 6. This device comprises a rotor support 178 comprising a shaft 171. The rotational axis sheet pack 36 and the guide piece 120 are fixed to the shaft 171. More specifically, the package 36 of sheets is mounted coaxially on the shaft 171. The package 36 of sheets is mounted integral in rotation and translation of the shaft 171. When the bundle 36 of sheets is mounted on the shaft 171, it can rotate along the axis R and a translation along the axis R.

The electrical wire winding device 170 further comprises a wire distribution device 175 comprising a wire coil 176 and a needle support 179 carrying a centrally hollow needle 177 for the passage of the winding wire. needle support 179 moving on a Z-axis rail 180 perpendicular to the axis R of the shaft 171. The needle 177 can thus translate along said axis Z. In order to produce a turn of the winding, the support 179 of the electrical wire winding device 170 carrying the needle 177 translates on the rail 180 in order to position the needle and the wire between two poles 44, at a distance of radial end of a pole 44 at the inner face of the flange 45 of the pole 44. The shaft 171 of the device 170 then performs a first translation along the axis R so as to position a section of this wire between two first opposite radial ends of said pole 44, then the shaft 171 makes a first rotation of axis R so as to position a section of this wire between two opposite first axial ends of said pole 44. The shaft 171 performs a second translation according to the R axis in the opposite direction of the previous translation so as to position a section of this wire between two opposite second radial ends of said pole 44 and then the shaft 171 performs a second th rotation of axis R in the opposite direction of the previous rotation so as to position a section of this electric wire between two opposite second axial ends of said pole.

These steps are repeated until the pole is fully wound, the translation of the needle 177 being calculated so that in section, the coil 50 at the pole 44 has a triangle shape, the number windings of yarn in a row tending to increase as one moves from the core of the pack 36 of sheets outwards. This form of winding 50 makes it possible to keep the space necessary for the needle 177 to effect the translations necessary for the winding of the pole 44 and allows the coils 50 of two adjacent poles 44 not to interfere with each other. Finally, a winding of decreasing width is obtained going from a return 45 to the outer edge of the wall 121 of the part 121 and the element 81.

After the winding of the poles, the packet 36 of plates, the elements 81, 82 insulators, the guide piece 120 and the associated excitation windings 50 are mounted on the rotor shaft 30, for example by fitting together. by force. Then the flanges 55, 56 are arranged axially on either side of the pack 36 of plates so that the centering pins 95 enter axial openings 66 formed in the projecting poles 44 and that the sectors 79 are positioned at inside parts 91 hollowed out. The collector 101 is positioned on the shaft 35 between the second flange 56 and the second insulating element 82.

The annular flanges 75 of the flanges 55, 56 then have a bearing surface on the outer radial end faces of the poles 44 so that the caps 89 of the insulating elements 81, 82 are sandwiched between an inner annular face. rim 75 and buns 51. Such a configuration allows the flanges 55, 56 to participate with the caps 89 in maintaining the buns 51 despite the centrifugal force caused by the rotation of the rotor 30. The threaded rod of the tie rods 62 is then introduced axially into the orifices 65 of FIG. fastening of the flange 55 before. The tie rods 62 are then screwed into the threaded fastening holes 65 of the rear flange 56 until the head of each tie rod 62 bears against the bottom of the associated countersink 68 of the front flange 55. Thus the tie rods 62 make it possible to axially grip the sheet package 36 and the insulating elements 81, 82 between the two flanges 55, 56.

Then a balancing operation flanges 55, 56 is performed. This operation consists for example in the drilling of holes or recesses in the periphery of the outer face of the radial wall 59 of each flange 55, 56 so that the rotor 30 does not vibrate when it is rotated. Thanks to the invention the balancing operation is facilitated by the flanges 55, 56 to reduce the number of fasteners.

The resolver 101 is positioned around the shaft 35, on the outer face of the radial wall 59 of the second flange 56.

When operating such a rotor 30, the excitation coils 50 tend to heat up in view of the current flowing through them.

The flanges 55, 56 rotate with the shaft 35 of the rotor 30. The blades 70 and stir air and air flows between the two flanges 55, 56 along the spaces between two adjacent poles through two series orifice 72, 73 of each flange 55, 56. The blades 70 and the orifices 72, 73 and dissipate in the air heat accumulated inside the rotor 30. The heat is effectively removed in the surrounding air by means of the blades 70 and the orifices 72, 73. The surrounding air is renewed thanks to the mixing and the turbulence induced by the blades 70.

As is evident from the description and drawings, the stator and rotor laminations make it possible to reduce the losses due to the eddy currents. The pole solution 44 in one piece with the central core of the plate package 36 is more advantageous than a reported poles solution because this solution has a better resistance to centrifugal force and ensures a smaller gap between the outer periphery of the rotor 30 and the inner periphery of the stator body. The embodiments described above make it possible to use the collectors 101 of conventional alternators, for example of the type described in document FR 2 710 197, and also the conventional mounting of the magnets of these alternators.

It is also evident from the description and the drawings that the flanges 55, 56, of hollow shape, have a flange 75 constituting a pressure element to maintain the sheet package 36 and prevent deformation, in particular a opening of it. The sheet package 36 is clamped between the flanges 55, 56. The flanges 75, configured to come into contact with the flaps 45, stiffen the flanges 55, 56 and constitute, via their inner periphery, a radial stop for the caps 89 of the elements 81. 82. Thus, under the action of the centrifugal force, the outer periphery of the caps 89 is allowed to cooperate with the inner periphery of the flanges 75 of the flanges 55, 56. These flanges 55, 56 constitute, via their flange 75, a axial stop for the magnets 105 implanted between two consecutive returns 45. The hollow form of the flanges can accommodate the buns 51, the elements 81, 82 with their caps 89 and a portion of the collector 101. It will be appreciated that the inner sectors 79 of the flanges avoid deformation of the core of the package 36 in combination with the walls 85 of the elements 81, 82. The elements 81, 82 are, as mentioned above, of electrically insulating material. They may be plastic, such as PA 6.6. They are thicker and less good heat conductor than notch insulators 83. Of course, the present invention is not limited to the described embodiments.

Thus it is possible to provide four tie rods 62, namely a hole by pulling 62. In a variant, two diametrically opposite tie rods 62 are provided and two diametrically opposed heat pipes, each heat pipe having a rod engaged in at least one hole of a flanges 55, 56 and at least in a section of the holes of the pack 36 of sheets and opening outwardly of the flange 55, 56 concerned. These heat pipes can completely cross the flanges 55, 56 and the package 36 of sheets and be configured outside the flanges 55, 56 to form fan blades 70. Such heat pipes are described for example in FIGS. 11A and 11B of the document FR 2,855,673 to which reference will be made. The provisions of Figures 12, 13 and 24 of this document are also applicable.

The number of poles 44 depends in the aforementioned manner of the applications. This number is 12 in the figures. Alternatively it may be 8 or 10. Compared to WO 2007/00385 the number of coils 50 is increased in all cases while having the possibility of increasing the number of magnets 105 at will to increase the power of the rotating electric machine with salient poles. Thus the number of magnets 105 may be smaller than the number of poles 44. Of course, the magnets 105 can be replaced by non-magnetic parts in order to have continuity of material at the outer periphery of the rotor 30. combinations. Thus all the spaces between the returns 45 may be free. Alternatively a portion of these spaces between the returns 45 may be free and others occupied by magnets 105 and / or non-magnetic parts. Alternatively the magnets 105 may be of different shade. For example some of the spaces between two returns 45 may be occupied by ferrite magnets and a at least part of the other spaces may be occupied by rare earth magnets.

Of course in a variant at least one of the elements 81, 82 is devoid of grooves and the insulation 83 may be integral with one of the elements 81, 82, for example by molding. In yet another variant, the insulator 83 may be in two parts each in one piece with one of the elements 81, 82. The insulation 83 may therefore be alternatively PA 6.6 being less thick than the elements 81 , 82.

Alternatively the flanges 55, 56 are obtained by molding, or forging or injection of plastic or metal.

In a variant, the blades 70 of at least one flange 55, 56 are removed. The two flanges 55, 56 are alternatively blade-free, especially when the rotating electric machine is cooled by water. More specifically, in the variant, the intermediate portion of the casing 1 1 comprises a channel for circulation of a cooling liquid, such that the coolant of the engine and the body of the stator 12 is mounted by shrinking inside the intermediate part. .

Of course when the two flanges 55, 56 do not carry blades 70 there is more freedom to implement the second series of openings 73, which can be wider circumferentially to extend on both sides of a winding 50.

In all cases at least one of the series of orifices 72, 73 and / or countersinks is different from a pool 55, 56 to the other.

Of course alternatively the series of orifices 72, 73 and / or countersinks are identical of a flange 55, 56 to the other.

Alternatively the housing 1 1 comprises a front bearing 14 and a rear bearing 15 as disclosed for example in Figure 14 of US 6 784 586 in the document showing a portion of the brushes and rectifier bridge current. The rotary electric machine 10 is alternatively an alternator devoid of resolver or any other means of monitoring the rotation of the rotor 30.

Alternatively the rotating electrical machine comprises an inverted current generator for supplying coils of a rotor as described in EP 0 331 559 or FR 2918512 (Figures 15 and 16). In this case the rotor caps can cooperate with a piece fixed on the outer periphery of the poles of the coils, also called cores, said piece being fixed for example by screws, as visible in the documents EP 0331 559 and FR 2 918 512 This piece is protruding and then covers the caps 89. The presence of the flanges is not required, the rotating electrical machine is alternatively an electromagnetic retarder.

Of course the pins 125, 130 are alternatively square section. The lateral edges 126 of the pins are alternately round, the upper and lower edges 126 consisting of flats. The upper edge may have another shape and include for example an extra thickness.

Alternatively one of the flanges 55, 56 nonmagnetic material is plastic and the other aluminum, brass or magnesium base. The plastic flange is advantageously made of plastic material reinforced with fibers. The embodiment of the flange made of plastic or aluminum makes it easy to obtain the blades by molding. Balancing of the plastic flange can be accomplished by adding material into at least one axial projection of the flange as described in DE 23 46 345 to which reference will be made. The balancing of at least one of the flanges is carried out alternatively by crimping at least one balancing mass in one of the recesses made in projections of this flange as described in the document DE 30 31 622 to which one refer to for more details.

Claims

1. Rotary electric machine (10) rotor (30) comprising:

a rotor shaft (35) intended to be rotatably mounted about its axis (B); a bundle (36) of laminations mounted coaxially on the rotor shaft (35), this bundle (36) of plates having a axis (R) of rotation and having at least two radially projecting poles (44),

an excitation winding (50) wound around each pole (44), so that axial end portions (51) of the winding, said "buns", project axially with respect to each external radial end face; the package (36) of sheets,

characterized in that it further comprises

- a guide piece (120) of winding wires positioned on an outer radial end face of the package (36) of sheets, this guide piece (120) comprising:

a radial wall (121) provided with a main opening allowing passage of the shaft (35),

at least one guide pin (125) positioned on an outer face of the radial wall (121), this guide pin (125) having at least one lateral edge (126) on which the winding wire bears, this pin (125) guide guiding the wire during the operation of winding the rotor and maintaining the wire in a fixed position once the winding operation of the rotor is completed.

2. Rotor according to claim 1, characterized in that the guide pin (125) has a rectangular section with chamfered corners.

3. Rotor according to claim 1 or 2, characterized in that the guide piece (120) further comprises at least one inner end pinion (130) ensuring the attachment of one end of the winding wire.

4. Rotor according to claim 3, characterized in that the pin (130) internal end has a hook shape to maintain one end of the winding wire.

5. Rotor according to one of claims 1 to 4, characterized in that the guide piece (120) comprises a series of pins (125) of guidance implanted globally on the same circumference on the outer face of the wall (121) radial of the guide piece.

6. Rotor according to claim 5, characterized in that a set of two adjacent guide pins (125) guiding the winding wire between the two coils (50) of the two poles (44) adjacent.

7. Rotor according to claim 5, characterized in that the winding winding wire (50) of one of the poles (44) being connected to two adjacent poles (44), a first set of two guide pins (125). guiding the winding wire between said pole (44) and one of the adjacent poles (44), a second set of two guiding pins (125) guiding the winding wire between said pole (44) and the other pole (44) adjacent, these two sets of two guide pins (125) having a pin (125) common guide.

8. Rotor according to claim 2, characterized in that at least one winding wire being used to ensure the winding of all the poles (44) of the rotor, an end internal pin (130) is positioned at the level of a first pole (44) to be wound for fixing one end of said winding wire and an inner end pin (130) is positioned at the last pole (44) to be wound for fixing the other end of said winding wire.

9. Rotor according to one of claims 1 to 8, characterized in that the guide piece (120) comprises at least two arms (88) arranged regularly around the outer edge of the wall (121) radial, these arms (88). ) being held pressed against a radial end face of a pole (44) projecting by a bun.

10. Rotor according to claim 9, characterized in that each arm (88) of the guide piece (120) has at its free end a cap (89) extending circumferentially on either side of the arm (88), these caps (89) being positioned between a bun (51) and the annular rim (75) of a flange (55, 56).

1 1. Guide piece (120) of winding wires of a rotor (30) of rotating electrical machine (10) according to one of the preceding claims, positioned on an outer radial end face of the package (36) of sheets, characterized in that it comprises:

at least one guide pin (125) positioned on an outer face of the radial wall (121), this guide pin (125) having at least one lateral edge (126) on which the winding wire bears, this pin (125) guide guiding the wire during the operation of winding the rotor (30) and maintaining the wire in a fixed position after the winding operation of the rotor (30) completed.

12. Method for winding poles (44) of rotor (30) rotating machine (10) electrical according to one of claims 1 to 10 characterized in that it comprises the following steps:

a step (150) for attaching a first end of the winding wire to a first end internal pin (130),

a step (151) for winding a first pole (44),

a step (152) for positioning the wire against at least one lateral edge (126) of two adjacent guide pins (125), for guiding the wire between two adjacent poles (44),

a step (153) of winding another pole (44),

a step (154) for attaching a second end of the winding wire to a second end internal pin (130),

The step (152) of positioning the wire and the step (153) of winding being repeated until all the poles (44) is wound.