FR3054749A1 - ROTATING ELECTRIC MACHINE WITH INTERCONNECTOR WITH IMPROVED CONFIGURATION - Google Patents

Abstract

The invention relates mainly to a stator (17) of rotating electrical machine, in particular for a motor vehicle, comprising: - a body (21) provided with a yoke and a plurality of teeth (23) extending radially towards the from an outer periphery of the yoke, - a multiphase coil (22) having a plurality of coils (36) having coupling portions (46), each coil (36) being wound around a tooth ( 23) corresponding to the stator body (21), and - an interconnector (43) having a plurality of coupling traces (47) provided with connection tongues (50), said interconnector (43) providing a coupling between coils (36). ) of different phases via their coupling portion (46), characterized in that the coupling traces (47) have different diameters with respect to each other and that end portions of the connecting tongues (50) lie on the same circumference.

Description

Holder (s): VALEO ELECTRIC EQUIPEMENTS MOTOR Simplified joint-stock company.

Extension request (s)

Agent (s): VALEO EQUIPEMENTS ELECTRIQUES MOTOR Simplified joint-stock company.

ROTATING ELECTRIC MACHINE PROVIDED WITH AN INTERCONNECTOR WITH IMPROVED CONFIGURATION.

FR 3 054 749 - A1 fü /) The invention relates mainly to a stator (17) of a rotating electric machine, in particular for a motor vehicle, comprising:

a body (21) provided with a cylinder head and with a plurality of teeth (23) extending radially outward from an external periphery of the cylinder head,

- a polyphase winding (22) comprising a plurality of coils (36) having coupling portions (46), each coil (36) being wound around a tooth (23) corresponding to the stator body (21), and

- an interconnector (43) comprising a plurality of coupling tracks (47) provided with connection tabs (50), said interconnector (43) ensuring coupling between coils (36) of different phases via their coupling portion (46) , characterized in that the coupling tracks (47) have different diameters with respect to each other and in that end portions of the connection tabs (50) lie along the same circumference.

ROTATING ELECTRICAL MACHINE PROVIDED WITH AN INTERCONNECTOR WITH IMPROVED CONFIGURATION

The invention relates to a rotary electrical machine provided with an interconnector with improved configuration.

The invention finds a particularly advantageous, but not exclusive, application in the field of electric machines operating in motor mode to ensure the rotation drive of motor vehicle fans.

Such fans installed on the front of the vehicle are intended to generate an air flow passing through a stack of heat exchangers such as, for example, an engine cooler and an air conditioning condenser positioned one behind the other.

To this end, these fans include a propeller driven in rotation by a bell-shaped rotor positioned around a stator with external teeth.

Indeed, the stator comprises a body provided with a plurality of teeth distributed angularly in a regular manner on an external periphery of the cylinder head.

A polyphase winding inserted in the notches of the stator is obtained for example from individual coils each wound around a tooth of the stator. An interconnector comprising a plurality of coupling traces ensures coupling between coils of different phases. To this end, the coupling tracks are provided with connection tabs on which the ends of the coils are welded.

In the existing configurations, the coupling tracks include connection tabs located at different levels making it difficult to weld between the coil wires and the connection tabs for the coupling tracks.

The invention aims to effectively remedy these drawbacks by proposing a stator of a rotating electrical machine, in particular for a motor vehicle, comprising:

a body provided with a cylinder head and with a plurality of teeth extending radially outward from an external periphery of the cylinder head,

a polyphase winding comprising a plurality of coils having coupling portions, each coil being wound around a corresponding tooth of the stator body, and

an interconnector comprising a plurality of coupling traces provided with connection tabs, said interconnector ensuring coupling between coils of different phases via their coupling portion, characterized in that the coupling traces have diameters different from each other to others and in that end portions of the connection tabs are located along the same circumference.

The invention thus makes it possible, thanks to the positioning along the same circumference of the connection tabs, to facilitate the production of welds between the coupling portions of the coils and the corresponding connection tabs.

According to one embodiment, the coupling traces have an open ring shape.

According to one embodiment, the connection tabs of each coupling trace are angularly spaced apart from each other in a regular manner.

According to one embodiment, the coupling traces are angularly offset with respect to each other.

According to one embodiment, the angular offset between two adjacent coupling traces is carried out so as to obtain groups of three connection tabs belonging to different traces, said groups being spaced regularly along the circumference of the interconnector.

According to one embodiment, the connection tabs are directed radially towards the outside of the interconnector.

According to one embodiment, the coupling traces have an axial elongation greater than their radial elongation.

According to one embodiment, the connection tabs have an axial rim of the same dimension. Thus, the tongues are all located at the same axial height to facilitate the production of welds.

According to one embodiment, each connection tab comprises a folding portion for holding a corresponding coupling portion.

According to one embodiment, the folding portions comprise a plunge. This is to prevent damage to the spool thread when the foldable portion is deformed.

According to one embodiment, each folding portion forms a right angle with respect to the corresponding connection tab.

According to one embodiment, each coupling trace has a plane of symmetry passing through a connection tab.

According to one embodiment, the coupling traces have a shape identical to a diameter and a length of the connection tabs.

The invention also relates to a rotary electrical machine, in particular for a motor vehicle, characterized in that it comprises a stator as defined above.

According to one embodiment, the rotary electric machine is a brushless DC machine.

The invention further relates to a fan for a motor vehicle, characterized in that it comprises a rotary electric machine as defined above.

The invention will be better understood on reading the description which follows and on examining the schematic figures which accompany it. These figures are given only by way of illustration but in no way limit the invention.

Figure 1 is a perspective view of the rotary electrical machine according to the present invention;

Figure 2 is a perspective view of part of the external tooth stator belonging to the rotary electric machine of Figure 1;

Figures 3a and 3b are perspective views respectively from above and from below of a wound stator according to the present invention provided with an interconnector with overmolded coupling traces;

Figure 4 is a perspective view from above illustrating an alternative embodiment of the wound stator according to the present invention provided with an interconnector with snap-in coupling traces;

Figure 5 is a detailed perspective view of the latching device used to fix the coupling tracks to the body of the interconnector of Figure 4;

FIG. 6 is an electrical diagram illustrating a first type of triangle coupling of the stator coils according to the invention;

Figure 7 is a schematic view of the front face of the stator located on the side 15 of the interconnector illustrating the positioning of the coupling portions between the coils of the different phases for the assembly of Figure 6;

Figure 8 is a schematic view of the rear face of the stator illustrating the layout of the routing portions between the coils of the same phase for the assembly of Figure 6;

FIGS. 9a and 9b are electric diagrams illustrating variants of triangle coupling of the stator coils according to the invention;

Figures 10a and 10b are perspective views from above and from below of the interconnector according to the present invention;

Figure 11 is a top view of the coupling traces belonging to the interconnector according to the present invention;

Figure 12 is a perspective view of a coupling trace according to the present invention;

Figure 13 is a sectional view of a connection tab belonging to a coupling trace of the interconnector according to the invention;

Figure 14 is a perspective view of the coil insulation pressed against the rear end face of the stator according to the invention;

Figure 15 is a perspective view of the rotor of the rotary electrical machine according to the present invention.

Identical, similar or analogous elements keep the same reference from one figure to another. In the description which follows, the so-called front side of the stator is located on the side of the interconnector and the so-called rear side is located on the opposite axial side.

Figure 1 shows an example of a rotating electrical machine 10. In this example, it is a brushless direct current rotating electrical machine also called "Brushless direct curent" (BLDC).

The rotary electrical machine 10 comprises a rotor 11 in the shape of a bell on which is intended to be fixed a propeller (not shown). The rotor 11 carries on its internal periphery a plurality of permanent magnets 12 forming the poles of the machine 10. The rotor 11 is rotatably mounted on a shaft 13 from a heat sink 16 which contains an electronic module for controlling the machine 10.

This rotor 11 surrounds a polyphase stator 17 with the presence of an air gap between the internal periphery of the rotor 11 and the external periphery of the stator 17.

This stator 17 of axis X is fixed to the heat sink 16 intended to be mounted on a support part, called a nozzle, carrying vehicle heat exchangers, such as the engine cooler and the air conditioning condenser. To this end, fastening members pass through openings made in projecting ears 18 coming from an external periphery of the heat sink 16.

The stator 17 comprises a body 21 and a winding 22. More precisely, as can be seen in FIG. 2, the stator body 21 consists, for example, of an axial stack of flat sheets. The body 21 has teeth 23 distributed angularly in a regular manner on an external periphery of a yoke 24. These teeth 23 delimit notches 27, so that each notch 27 is delimited by two successive teeth 23. The cylinder head 24 thus corresponds to the full internal annular portion of the body

21 which extends between the bottom of the notches 27 and the internal periphery of the stator 17. The notches 27 open axially in the axial end faces of the body 21. The notches 27 are also open radially towards the outside of the body 21.

In this example, the stator 17 is provided with tooth feet 28 on the side of the free ends of the teeth 23. Each tooth foot 28 extends circumferentially on either side of a corresponding tooth 23.

The stator 17 also comprises parts 31 coming from the internal periphery of the yoke 24 extending in radial projection towards the inside of the yoke 24. Each projecting part 31 has an axial opening 32 passing through which penetrates a fixing member 33, for example a screw as shown in FIG. 3a, to secure the stator 17 to the heat sink 16.

To obtain the winding 22, several phases are formed by coils 36 each wound around a corresponding tooth 23 of the body 21 of stator 17, as illustrated by FIGS. 3a, 3b, and 4.

According to a preferred configuration, the winding 22 of the three-phase type is formed by 18 coils 36 and the rotor 11 has 12 poles or 12 permanent magnets. The 18 coils are formed from the same continuous wire 37 whose diameter is less than 1.5mm. For example, this wire 37 can have a diameter of the order of 1.2 mm. The electrically conductive wire 37 is preferably covered with a layer of electrically insulating material such as enamel.

Advantageously, the winding 22 is a three-phase winding formed from three sets 40 of coils 36 coupled in a triangle. According to a first embodiment shown in FIG. 6, each assembly 40 comprises three branches 41 electrically mounted in parallel, each branch 41 having two coils 36 electrically connected in series. According to a second embodiment shown in FIG. 9a, each assembly 40 comprises two branches 41 electrically mounted in parallel, each branch 41 having three coils 36 electrically connected in series. According to a third embodiment shown in FIG. 9b, each assembly 40 comprises six coils 36 electrically connected in parallel.

An interconnector 43 shown in FIGS. 3a, 3b, 4, 10a and 10b ensures coupling between coils 36 of different phases U, V, W via their coupling portion 46. Each coupling portion 46 thus corresponds to a portion of the wire 37 extending between two coils 36 of different phases and connected electrically to the interconnector 43.

More specifically, the Y axis interconnector 43 comprises a body 44, made of an electrically insulating material, for example plastic, and a plurality of coupling tracks 47 provided with connection tabs on which the coupling portions 46 are welded. who have previously been stripped of their enamel. It should be noted that when the interconnector 43 is mounted on the stator 17, its axis Y is substantially coincident with the axis X of the stator 17.

In the embodiment of FIGS. 3a and 3b, the body 44 is overmolded on the coupling tracks 47.

Alternatively, as shown in FIGS. 4 and 5, the coupling traces 47 in the form of an open ring are inserted into circular grooves of the body 44 of corresponding shape. The coupling traces 47 are maintained inside the grooves 51, for example by snap-fastening. To this end, a radial edge of the connection tabs 50 comes to bear against ramps 54 formed in faces of the interconnector 43 delimiting radial housings for the connection tabs 50. The ramps 54 are here produced in two screw faces -with respect to the body 44 extending in a substantially radial direction.

There is a first coupling trace 47 ensuring the coupling between the coils 36 of a first phase U referenced U1-U6 and the coils 36 of a second phase V referenced V1-V6, a second coupling trace 47 ensuring the coupling between the coils 36 of phase V referenced V1-V6 and the coils 36 of a third phase W referenced W1-W6, and a third coupling trace 47 ensuring coupling between the coils 36 of phase U referenced U1-U6 and the coils 36 of phase W referenced W1-W6. The number of coupling traces 47 could of course be adapted as a function of the number of phases of the electric machine.

As can be seen in the example in FIG. 11, the coupling traces 47 of different diameters are coaxial and stacked radially with respect to each other. The traces 47 are spaced radially from each other, so that there is a layer of electrically insulating material between two adjacent traces 47 to ensure their electrical insulation. The insulating layer could consist of a part of the body 44 molded for the embodiment of FIGS. 3a and 3b or an insulating wall defining a groove 51 for the embodiment of FIGS. 4 and 5.

Preferably, the coupling trace 47 of larger diameter of the interconnector 43 has an external diameter smaller than the internal diameter of the yoke 24 of the stator body 21.

In addition, each coupling trace 47 has a body 99 which can have an axial elongation greater than its radial elongation to present a shape of a ring extending axially with respect to the axis X of the stator 17. Preferably, the body 99 has the shape of an arc of a circle.

The coupling tracks 47 are positioned axially between two axial ends of the winding 22, as shown in FIGS. 3a and 3b. In other words, the axial ends of the annular part of the coupling tracks 47 considered without the connection tabs 50 are positioned between the axial portions of the coils 36 projecting on either side of the stator body 21.

Preferably, the assembly of the interconnector 43 is positioned axially between the two axial ends of the winding 22. This makes it possible to obtain a compact assembly according to the axial and radial dimensions.

In order to facilitate the welding operations, the connection tongues 50 directed radially towards the outside of the body 99 of the corresponding coupling trace 47 have end portions 57 situated along the same circumference, as illustrated by the figure. 11. For this purpose, the radial lengths of the tabs 50 located on the internal coupling tracks 47 are greater than the lengths of the connection tabs 50 located on the most external coupling track 47 of the radial stack.

The connection tabs 50 also comprise an axial flange 58 of the same dimension so as to be all situated at the same axial height relative to the stator body 21, as shown in FIG. 12.

The connection tabs 50 of each coupling trace 47 are angularly spaced apart from each other in a regular manner. In addition, the angular offset between two adjacent coupling traces 47 is carried out so as to obtain groups 60 of three connection tabs 50 belonging to different traces 47, as shown in FIG. 11. These groups 60 are spaced apart regular along the circumference of the interconnector 43. There is a circumferential alternation between the connection tabs 50 of the different coupling traces 47.

Each connection tongue 50 preferably comprises a folding portion 63 lying in the extension of the end portion 57 of the tongue 50, as can be seen in FIGS. 12 and 13. Each folding portion 63 ensures the maintenance of a corresponding coupling portion 46 of the wire 37.

In order to avoid damage to the wire 37 of the spool 36 during the deformation of the foldable portion 63, each foldable portion 63 may include a groove 64 visible in FIG. 13. This run 64 is defined by a recess at the level of the anchoring end of the folding portion 63 with the connection tab 50. The threading 64 is applicable in the case where the traces are clipped, which corresponds to the embodiment of FIG. 4.

On the other hand, in the embodiment of FIGS. 3a and 3b corresponding to an overmolding of the coupling tracks 47, the foldable portions 63 are devoid of grooving 64, in particular for reasons of space.

Each folding portion 63 then forms a right angle relative to the corresponding connection tab 50.

In order to facilitate their realization, each coupling trace 47 can have a plane of symmetry P1 passing through a connection tab 50. The coupling traces 47 all further have a shape identical to a diameter and a radial length of the connection tongues 50 near. It is thus possible to standardize their manufacture.

In addition, as illustrated by FIGS. 10a and 10b, the interconnector 43 forms a coil insulator. To this end, the body 44 comprises a central annular portion 67 intended to be pressed against the cylinder head 24. This central annular portion 67 is located in the extension of the annular portion 68 of the interconnector 43 comprising the coupling traces 47.

The interconnector 43 further comprises a plurality of arms 71 coming from the annular portion 67. These arms 71 extending radially outwards are intended to be pressed each against a corresponding end face of a tooth 23 of the body stator 21. In addition, insulating walls 72 located in the extension of the longitudinal edges of the arms 71 are intended to be pressed against the side faces of teeth 23 corresponding.

Recesses 75 made in the body 44 allow a passage of welding electrodes on either side of the connection tabs 50. The electrodes displaced in two opposite axial directions can thus pinch the connection tab 50 - portion of coupling 46 to allow the welding to be carried out. To this end, the recesses 75 produced in the lower part of the body 44 open out towards the lower face of the tongues 50. The upper face of the tongues 50 is also released for bringing the wire of the coupling portions 46 into contact with the tongues 50.

Clearances 76 made in the body 44 allow the fixing members 33 to pass inside the openings of the projecting parts 31 to fix the stator 17 on the heat sink 16.

In addition, a coil insulator 80 shown in Figure 14 can be positioned against an axial end face of the stator body 21 opposite to the interconnector 43. This coil insulator 80 has a structure similar to that of the parts of the interconnector 43 having an electrical insulating function. Thus, the coil insulation 80 comprises a central annular portion 82 pressed against the end face of the yoke 24 opposite the interconnector 43 and a plurality of arms 83 coming from the annular portion 82. These arms 83 extending radially outwards are intended to be pressed each against a corresponding end face îo of a tooth 23 of the stator body 21. In addition, insulating walls 84 located in the extension of the longitudinal edges of the arms 83 are intended to be pressed against the lateral faces of corresponding teeth 23 so as to at least partially cover these lateral faces. For this purpose, the insulating walls 84 are directed axially, like the insulating walls 72, towards the inside of the stator 17. In other words, the insulating walls 72 and 84 are directed axially towards one another.

Advantageously, the insulating walls 84 of the coil insulation 80 and the insulating walls 72 of the interconnector 43 are axially spaced from one another. The insulating walls 84 of the coil insulation 80 and / or the insulating walls 72 of the interconnector 43 have a height less than half the axial height of the stator body 21. Such a configuration makes it possible to adapt to different configuration of stator 17 and in particular to stators 17 of different axial lengths for addressing different powers of an electric machine, without having to modify the structure of the interconnector 43 or of the coil insulation 80.

In addition, due to the tension of the wire 37 between the two insulating faces 72, 84 facing each other, the wire 37 is kept away from the areas of the lateral faces of the teeth 23 which do not are not covered by the insulating walls 72, 84, so that it is not necessary to use an additional insulator of the insulating paper type inside the notches 27 in the space between the two insulating walls 72.

The coupling traces 47 are each provided with a connection terminal (not shown) intended to be connected with a corresponding connection terminal of the electronic control module integrated in the heat sink 16. This module includes switches, such as transistors MOS type for example, controlled to inject current into the different phases of the electric machine operating in motor mode.

Described below, with reference to FIGS. 6, 7, and 8, the operations making it possible to obtain the winding 22 of the stator 17. The coils 36 are advantageously produced from the same continuous wire 37 by means of a needle device intended to pass the wire 37 around the teeth 23 of the stator body 21 via a notch opening 87 corresponding to the circumferential space between two adjacent tooth feet 28 (cf. FIG. 2). To make the turns 88 of the coils 36, the needle performs axial movements from top to bottom combined with circumferential movements alternately in one direction then in another. A relative radial movement between the needle and the tooth 23 of the stator 17 makes it possible to produce the different layers of turns 88.

According to certain implementations, the needle performs all of the movements with respect to a fixed stator body 21 to obtain the winding 22. In other winding methods, the movements are distributed between the needle and the stator body 21.

Once the first coil 36 has been produced, for example the coil U1 of the first phase U, the needle moves by three notches 27 to produce the second coil U2 of the first phase electrically connected in series with the first coil U1, such as shown in Figures 6 and 7. In other words, a space is provided to be able to produce the coils of the other two phases between two successive coils 36 of the same phase, for example the coils V4 and W3. The displacement is carried out in such a way that the routing portion 91 between the two coils U1 and U2 of the same phase, here the phase U, extend on the side of the face opposite to the interconnector 43 (cf.

figure 8).

Once the second coil U2 has been produced, the wire 37 passes through a connection tab 50 to ensure coupling between the first phase and the second phase (coupling U2-V1 in the figure) before being inserted into the adjacent notch 27 to the second coil U2 to make the first coil V1 of the second phase. The coupling is carried out for example by welding the coupling portion 46 on a corresponding connection tab 50 after having stripped the enamel of the coupling portion 46.

After having jumped two notches 27 via a routing portion 91, the second coil V2 of the second phase is produced then a coupling is carried out, via a coupling portion 46, with the first coil 36 of the third phase W1 and so on until a complete winding 22 is obtained.

In other words, the winding 22 is obtained by the alternating production of two coils 36 in series of the same phase and then of coupling between the last coil in the series with a first coil of a new series of two coils belonging to another phase.

The coupling between the coils 36 of different phases is thus carried out on an axial side of the stator body 21 via the interconnector 43 and the routing of the portions of wire 37 connecting coils 36 of the same phase is carried out, via the portions routing 91, on the opposite axial side of the stator body 21 with respect to the interconnector 43, as shown in FIGS. 7 and 8. It should be noted that in FIG. 8, the arrows F1 indicate the direction of the winding and therefore the order in which the different coils 36 are produced.

The winding 22 can thus be produced from a single wire. This wire is not cut during the coupling operations with the interconnector 43.

Furthermore, as can be seen in FIG. 15, the rotor 11 comprises an annular wall of axial orientation 94 positioned around the stator 17. This annular wall 94 is coaxial with the stator 17. This annular wall 94 extends from a outer periphery of an annular wall of radial orientation 95. This annular wall of radial orientation 95 is extended centrally by a sleeve 96 in which is mounted a bearing means 97, such as a ball or needle bearing, for ensure rotational mounting of the rotor 11 on the shaft 13 fixed to the heat sink 16. The annular wall of transverse orientation 95 can be perforated to allow air circulation inside the machine 10. The annular wall d transverse orientation 95 comprises means 98 for fixing the fan, constituted for example by through openings in which are inserted fixing members, such as screws or rivets.

The plurality of permanent magnets 12 forming the poles of the machine is fixed on an internal periphery of the annular wall of axial orientation 94.

The magnets 12, for example of parallelepiped shape, are preferably made of ferrite. Alternatively, they may however be made of rare earth according to the applications and the desired power of the electric machine 10. The magnets 12 may also be of different shades, depending on the applications.

Of course, the foregoing description has been given by way of example only and does not limit the scope of the invention from which one would not depart by replacing the various elements with any other equivalent.

Furthermore, the various features, variations, and / or embodiments of the present invention can be combined with one another in various combinations, insofar as they are not incompatible or mutually exclusive of each other.

Claims (15)

1. Stator (17) of a rotating electrical machine (10), in particular for a motor vehicle, comprising: a body (21) provided with a cylinder head (24) and with a plurality of teeth (23) extending radially outwards from an external periphery of the cylinder head (24), - a polyphase winding (22) comprising a plurality of coils (36) having coupling portions (46), each coil (36) being wound around a tooth (23) corresponding to the stator body (21), and îo - an interconnector (43) comprising a plurality of coupling tracks (47) provided with connection tabs (50), said interconnector (43) ensuring coupling between coils (36) of different phases via their coupling portion (46) , characterized in that the coupling tracks (47) have 15 different diameters with respect to each other and in that end portions (57) of the connection tabs (50) lie along the same circumference. 2. Stator according to claim 1, characterized in that the coupling tracks (47) have the shape of an open ring. 20 3. Stator according to claim 1 or 2, characterized in that the connection tabs (50) of each coupling trace (47) are angularly spaced apart from each other in a regular manner. 4. Stator according to any one of claims 1 to 3, characterized in that the coupling tracks (47) are angularly offset one 25 compared to others. 5. A stator according to claim 4, characterized in that the angular offset between two adjacent coupling traces (47) is carried out so as to obtain groups (60) of three connection tabs (50) belonging to traces (47) different, said groups (60) being spaced 30 evenly along the circumference of the interconnector (43). 6. Stator according to any one of claims 1 to 5, characterized in that the connection tabs (50) are directed radially outward from the interconnector (43). 7. Stator according to any one of claims 1 to 6, characterized in that the coupling tracks (47) have an axial elongation 5 greater than their radial elongation. 8. Stator according to any one of claims 1 to 7, characterized in that the connection tabs (50) have an axial flange (58) of the same dimension. 9. Stator according to any one of claims 1 to 8, characterized îo in that each connection tab (50) comprises a folding portion (63) for holding a corresponding coupling portion (46). 10. Stator according to claim 9, characterized in that the folding portions (63) comprise a groove (64). 11. Stator according to claim 9, characterized in that each folding portion (63) forms a right angle relative to the corresponding connection tab (50). 12. Stator according to any one of claims 1 to 11, characterized in that each coupling trace (47) has a plane of symmetry (P1) passing through a connection tab (50). 20 13. Stator according to any one of claims 1 to 12, characterized in that the coupling traces (47) have a shape identical to a diameter and a length of the connection tabs (50) close. 14. Rotating electric machine (10) especially for vehicle 25 automobile, characterized in that it comprises a stator (17) as defined according to any one of the preceding claims. 15. Fan for a motor vehicle, characterized in that it comprises a rotary electric machine (10) as defined according to the preceding claim. 1/10