Axial flux rotary electric machine

Abstract

The invention relates to an electric machine (1) comprising: - a casing (2) defining a cavity; - at least one rotor (3) mounted so as to be able to rotate in the cavity of the casing (2) about an axis X; and - at least one first stator (4) positioned in the cavity axially facing the rotor (3); wherein the casing (2) comprises an inlet (41) intended to be connected to a coolant supply pipe and a first chamber (19) connected to the inlet, wherein the first stator (4) is arranged axially between the first chamber (19) and the rotor (3), wherein the first chamber (19) comprises a plurality of spray openings (43) that open axially facing an annular space formed radially between coils (27) and an interconnector (34) of the first stator (4), and wherein each spray opening (43) is arranged axially facing a deflector (44, 45) that is configured to deflect a flow of coolant sprayed by the spray opening (43) and direct it radially towards the axis X in the direction of one of the coils (27).

Description

Description Title of the invention: Axial flux rotating electric machine Technical field

[0001] The invention relates to an axial flux rotating electrical machine, in particular for an electric or hybrid vehicle. Technological background

[0002] In the state of the art, axial flux rotating electrical machines are known which are equipped with a cooling circuit in which a cooling fluid circulates and which aims to cool the rotating machine in order to prevent it from heating up. Such a rotating machine is disclosed in particular in documents FR3073341 and FR3117706.

[0003] Such axial flux rotating electrical machines are not fully satisfactory, in particular because their cooling circuit does not ensure sufficiently efficient and uniform cooling of the stator coils and / or has a complex structure. Summary

[0001] An idea underlying the invention is to propose an axial flux rotating electrical machine equipped with efficient and simple cooling means.

[0002] Another idea underlying the invention is to propose a rotating electrical machine which is simple and compact.

[0003] According to one embodiment, the invention provides an electrical machine comprising: - a housing defining a housing; - at least one rotor mounted to rotate in the housing of the casing around an axis X; and - at least a first stator which is positioned in the housing, axially opposite the rotor, and which comprises: - a stator body equipped with teeth which project towards the rotor and which are distributed around the X axis; - coils which comprise a winding and which are carried by the teeth; and - an interconnector which is arranged radially outside the coils and comprises an interconnector support and conductive traces, said conductive traces being supported by the interconnector support and connected to the windings; the casing comprising an inlet intended to be connected to a coolant supply pipe and a first chamber connected to said inlet, the first stator being arranged axially between the first chamber and the rotor, the first chamber comprising a plurality of spray orifices which open axially opposite an annular space arranged radially between the coils and the interconnector, each spray orifice being arranged axially opposite a deflector which is configured to deflect a flow of coolant sprayed by said spray orifice and direct it radially towards the X axis in the direction of one of the coils.

[0004] Thanks to these features, and in particular the arrangement of the interconnector radially outside the stator, the electric machine is axially compact. In addition, the arrangement of the first chamber, the spray holes and the deflector ensure efficient cooling of the coils with a simple and compact structure.

[0005] According to embodiments, such an electric machine may comprise one or more of the following characteristics.

[0006] According to one embodiment, the deflector projects radially inward from the interconnector support. Thus, in addition to its primary function, the interconnector performs a second function, namely to carry the deflectors which redirect the coolant flows to the coils, thereby further simplifying the structure of the electrical machine.

[0007] According to one embodiment, the windings of the coils are concentrated, that is to say that the winding of each of the coils is mounted around one of the teeth. In other words, each tooth of the stator carries exactly one of the windings.

[0008] According to another embodiment, the windings of the coils are distributed, that is to say that each winding is distributed over at least two of the teeth of the stator.

[0009] According to one embodiment, the electrical machine comprises, for each coil, at least one spray orifice arranged in the first chamber and at least one deflector, said spray orifice being arranged axially opposite said deflector and said deflector being configured to deflect the flow of cooling fluid sprayed by said spray orifice and direct it radially towards the X axis in the direction of the coil. This further enhances the uniformity of cooling of the stator coils.

[0010] According to one embodiment, the electrical machine comprises, for each coil, at least two spray orifices arranged in the first chamber and at least two deflectors, said two spray orifices being spaced from each other in the circumferential direction and arranged respectively axially opposite one and the other of said two deflectors, said two deflectors being axially spaced from each other. This improves the homogeneity of the cooling of the winding of each of the coils by axially distributing the flows of cooling fluid.

[0011] According to one embodiment, the first chamber extends radially inward beyond the coils. This increases the heat exchange by conduction between the coolant and the casing.

[0012] According to one embodiment, the casing comprises: - a peripheral rim which extends axially and is arranged radially outside the first stator; - a first bottom which extends radially inwards from one end of the peripheral rim; and - a first flange which is fixed in a sealed manner to the casing and is arranged opposite the first base, at a distance from it so as to provide the first chamber between the first flange and the first base. The structure of the first chamber is thus particularly simple.

[0013] According to one embodiment, the first stator is in contact against the first base so as to allow heat exchange by conduction between the cooling fluid intended to be placed in the first chamber and the first stator.

[0014] According to one embodiment, the rotor is rotationally secured to an output shaft which is guided in rotation about the X axis by means of at least one rolling bearing, the first base having an opening through which the output shaft passes and an annular skirt which borders said opening and extends axially in the direction of the rotor, said rolling bearing being received inside said annular skirt. Thanks to such an arrangement, the lubrication of said rolling bearing can also be ensured by the cooling fluid, when the latter has lubricating properties, such as oil for example.

[0015] According to one embodiment, the first flange has an annular shape and comprises an external edge which is welded in a sealed manner to the end of the rim. peripheral and an internal edge which is sealed to a portion of the first bottom which projects axially in the direction opposite the rotor.

[0016] According to one embodiment, the first flange is fixed in a sealed manner to the housing by a friction stir welding process. The fixing of the first flange is thus ensured without a fixing member. In addition, no sealing gasket is required to ensure the sealing of the first chamber.

[0017] According to one embodiment, the electrical machine comprises a second stator which is positioned in the housing, axially opposite the rotor, the first and second stators being arranged axially on either side of the rotor, the second stator comprising: - a stator body equipped with teeth which project towards the rotor and which are distributed around the X axis; - coils which comprise a winding and which are carried by the teeth; and - an interconnector which is arranged radially outside the coils and comprises an interconnector support and conductive traces, said conductive traces being supported by the interconnector support and connected to the windings; the casing comprising a second chamber connected to said inlet, the second stator being arranged axially between the second chamber and the rotor, the second chamber comprising a plurality of spray orifices which open axially opposite an annular space arranged radially between the coils of the second stator and the interconnector, each spray orifice of the second chamber being arranged axially opposite a deflector which is configured to deflect a flow of cooling fluid sprayed by said spray orifice and direct it radially towards the X axis in the direction of one of the coils of the second stator.

[0018] According to one embodiment, the casing comprises: - a peripheral rim which extends axially and is arranged radially outside the second stator; - a second bottom which extends radially inward from one end of the peripheral rim; and - a second flange which is fixed in a sealed manner to the casing and is arranged opposite the second base, at a distance from it so as to provide the second chamber between the second flange and the second base.

[0019] According to one embodiment, the second stator is in contact against the second bottom so as to allow heat exchange by conduction between the cooling fluid intended to be placed in the second chamber and the second stator.

[0020] According to one embodiment, the casing comprises a first and a second half-casing which are fixed to each other in a sealed manner, the first and second half-casings respectively comprising the first and second bottoms.

[0021] According to one embodiment, the invention relates to a motor vehicle comprising an electric machine of the aforementioned type. Brief description of the figures

[0022] The invention will be better understood, and other objects, details, characteristics and advantages thereof will appear more clearly during the following description of several particular embodiments of the invention, given solely for illustrative and non-limiting purposes, with reference to the accompanying drawings.

[0023] [fig.1] Figure 1 is a sectional view of an axial flux rotating electrical machine along an axial plane.

[0024] [fig.2] Figure 2 is a perspective view of the electric machine of Figure 1.

[0025] [fig.3] Figure 3 is a partial perspective view of the electrical machine in which one of the flanges is not shown so that the internal space of one of the chambers intended to receive the cooling fluid is visible.

[0026] [fig.4] Figure 4 is a sectional view of the casing of the electric machine along an axial plane.

[0027] [fig.5] Figure 5 is a perspective view of the rotor of the electric machine.

[0028] [fig.6] Figure 6 is a partial perspective view of the electric machine in which one of the half-casings is not shown so as to observe one of the stators.

[0029] [fig.7] Figure 7 is a perspective view showing the stator support of one of the stators of the electric machine as well as the coils which it carries, two coils not being shown so as to observe the structure of two teeth intended to carry coils.

[0030] [fig.8] Figure 8 is a perspective view of the interconnector of one of the stators of the electric machine.

[0031] [fig.9] Figure 9 is a half-view, in section along an axial plane of the electric machine. Description of the embodiments

[0032] In the description and the claims, the terms "external" and "internal" as well as the orientations "axial" and "radial" will be used to designate, according to the definitions given in the description, elements of the electrical machine. By convention, the X axis of rotation of the rotor defines the "axial" orientation. The terms "external" and "internal" are used to define the relative position of one element with respect to another, with reference to the X axis, an element close to the X axis is thus qualified as internal as opposed to an external element located radially on the periphery. The "circumferential" orientation is directed orthogonally to the X axis and orthogonally to the radial direction.

[0033] In the example described below, the electric machine 1 is a permanent magnet synchronous machine. It can in particular be used as a motor intended to provide propulsion for an electric or hybrid vehicle and / or as a generator for such a vehicle.

[0034] In relation to figures 1 to 9, a rotating axial flux electrical machine 1 is described below according to one embodiment.

[0035] As shown for example in Figure 1, the electrical machine 1 comprises a casing 2 defining a housing in which are housed at least one rotor 3 mounted to rotate around the axis of X and at least one stator 4 which is placed axially face to face with one of the two faces of the rotor 3.

[0036] The rotor 3 is rotationally secured to an output shaft 5 which has a splined end 6. The splined end 6 of the output shaft 5 is intended to be housed in a splined hub of a reduction device, not shown. Such a reduction device is configured to increase the torque delivered by the rotating machine and may have one or more reduction ratios. In the latter case, the reduction device forms a gearbox.

[0037] In the embodiment shown, the electrical machine 1 comprises a single rotor 3 and two stators 4 which are positioned axially on either side of the rotor 3 and which are respectively arranged axially opposite each other on one and the other of the two faces of the rotor 3.

[0038] The casing 2 comprises two half-casings 7, 8 which are fixed to each other and define the housing. Each half-casing 7, 8 comprises a peripheral rim 9 which extends axially and is arranged radially outside the stator 4 and a bottom 12 which extends radially from one end of the peripheral rim 9. The peripheral rim 9 of each half-casing 7, 8 extends to the peripheral edge 9 of the other half-casing 7, 8 so as to hermetically close the housing.

[0039] The two half-casings 7, 8 are fixed to each other by means of fixing members 10, such as bolts. The fixing members 10 pass through fixing lugs 11 which project radially from the peripheral edges 9 of the half-casings 7, 8 and are regularly distributed around the axis X.

[0040] The bottom 12 of one of the half-casings 7 is pierced in its center so as to form an opening 13 allowing the passage of the output shaft 5 so that its grooved end 6 projects outside the casing 2.

[0041] The bottom 12 of said half-casing 7 has an annular skirt 14, notably visible in figures 1 and 4, which borders the opening 13 and which extends axially in the direction of the bottom 12 of the other of the half-casings 8. The annular skirt 14 is shaped to receive, on its cylindrical internal face, a rolling bearing 15, notably visible in figure 1.

[0042] Similarly, the bottom 12 of the other half-casing 8 also has an opening and an annular skirt 16, notably visible in Figures 1 and 4, which borders this opening. The annular skirt 16 extends axially towards the bottom 12 of the other of the half-casings 7 and receives, on its cylindrical internal face, a rolling bearing 17. Alternatively, the bottom 12 of the half-casing 8 has no opening.

[0043] As shown in Figure 1, the output shaft 5 is guided in rotation, around the axis X, on the casing 2 by means of the two rolling bearings 15, 17 which are respectively received against the internal face of the cylindrical skirt 14, 16 of one and the other of the two half-casings 7, 8.

[0044] Each of the half-casings 7, 8 is also equipped with a flange 18 which is arranged opposite the bottom 12 of the respective half-casing 7, 8 and is spaced therefrom so as to define, between the bottom 12 and the flange 18, a chamber 19. The chamber 19 is intended to receive a cooling fluid. The function and the characteristics of this chamber will be described in more detail below.

[0045] The flange 18 has an annular shape and its outer edge is welded in a sealed manner to the end of the peripheral rim 9 while its inner edge is welded in a sealed manner to a portion 20 of the bottom 12 of the half-casing 7, 8, notably visible in FIG. 3, which projects axially towards the outside of the casing 2. In the embodiment shown, the portion 20 of the bottom 12 has an axial shoulder, which makes it easier to position and center the flange 18 relative to the bottom 12.

[0046] The flange 18 may in particular be fixed to the half-casing 7, 8 by a friction stir welding process. According to one embodiment, the flange 18 is made of aluminum.

[0047] The rotor 3 is shown in detail in Figure 5. It comprises a disc 21 which is secured to the output shaft 5 and has an orifice through which said output shaft 5 passes. The disc 21 carries a plurality of permanent magnets 22 which are distributed around the axis X. The permanent magnets 22 have the shape of a truncated disc sector. They are each arranged in a housing of the disc 21.

[0048] In the embodiment shown, the permanent magnets 22 are connected to each other by two circles 23 made of polymer material which are arranged axially on either side of the disc 21. Each circle 23 comprises a ring 28 and legs 29 which project radially outwards from the ring 28 and are each overmolded against a face of a respective permanent magnet 22.

[0049] In relation to figures 6, 7 and 8, one of the stators 4 of the electrical machine 1 is described. The stator 4 comprises a stator body 24, notably shown in figure 7. The stator body 24 comprises an annular plate 25 which is centered around the axis X and teeth 26 which are distributed on one face of the annular plate 25 and project axially in the direction of the rotor 3.

[0050] According to one embodiment, the teeth 26 are made from a stack of electrical steel sheets. Alternatively, each tooth 26 is made from soft magnetic composite material, or “Soft Magnetic Composite (SMC)” in English, in particular obtained by sintering.

[0051] The stator 4 also comprises a plurality of coils 27 which are each carried by one of the teeth 26. Each coil 27 comprises an insulating support 30 which comprises a sheath fitted onto one of the teeth 26 and two flanges 31, 32 extending in vertical planes, respectively from one and the other of the two ends of the sheath.

[0052] The coils 27 also comprise a winding 33 which is made of wire, for example copper, and is wound around the sheath of the insulating support 30 between the two edges 31, 32. In the embodiment shown, the coils 27 have a trapezoidal section.

[0053] In the embodiment shown, the windings are therefore of the concentrated type with one winding 33 per tooth 26. In another embodiment, not shown, the windings are of the distributed type.

[0054] The coils 27 are arranged circumferentially next to each other, leaving a space between two adjacent coils 27.

[0055] Furthermore, each stator 4 also comprises an interconnector 34, visible in figures 6 and 8, making it possible, on the one hand, to connect the coils 27 to each other and on the other hand to connect said coils 27 to a connector 40, shown in particular in figure 1, which is intended to be connected to the electrical circuit of the vehicle.

[0056] The interconnector 34 comprises an interconnector support 35 which is annular in shape. The interconnector support 35 comprises an outer skirt 36 and an inner skirt 37 which extend axially around the axis X and are concentric with each other. The outer skirt 36 and the inner skirt 37 are connected to each other by two annular side walls 38, 39. The interconnector 34 also comprises three annular conductive traces corresponding to the three phases of the electrical machine 1. The three conductive traces are connected to the windings 33 of the coils 27 and are arranged in the housing provided radially between the outer skirt 36 and the inner skirt 37 of the interconnector support 35. The conductive traces are embedded in a resin making it possible to electrically insulate them from each other.

[0057] A circuit for circulating a cooling fluid inside the electrical machine 1 will now be described below. The cooling fluid is a dielectric fluid, such as oil for example. The circulation of such a cooling fluid is more particularly intended to cool the coils 27 of the stator 4 in order to prevent overheating of the electrical machine 1.

[0058] The casing 2 comprises a cooling fluid inlet 41 which is arranged in the upper part of the casing 2. The inlet 41 here has the shape of a connecting end piece configured to be connected to a cooling fluid supply pipe. As illustrated in FIG. 1, the inlet 41 opens into a channel 42 which is arranged in the casing 2 and more particularly in the peripheral edges of the two half-casings 7, 8. The channel 42 leads to each of the two chambers 19 arranged between the bottom 12 of a half-casing 7, 8 and the facing flange 18. The casing 2 also comprises an outlet 48, visible in particular in FIGS. 1 and 2, which passes through the bottom 12 of one of the half-casings 7, 8, preferably at its lowest point, to open into the interior of the casing 2.

[0059] Advantageously, the stator bodies 24 are respectively in contact against the bottom 12 of one and the other of the two half-casings 7, 8. Furthermore, each of the chambers 19 extends radially towards the axis X beyond the radially internal end of the coils 27. Such an arrangement increases the contact surface of the cooling fluid with the bottom 12 of the half-casings 7, 8, which increases the heat exchange by conduction between the cooling fluid and the stator 4.

[0060] Furthermore, as illustrated in Figure 3, the bottom 12 of each of the half-casings 7, 8 has a plurality of spray orifices 43 which are distributed around the axis X. The spray orifices 43 open axially opposite an annular space formed between one of the coils 27 and the interconnector 34. The spray orifices 43 thus make it possible to conduct the cooling fluid from one of the chambers 19 towards the stator 4.

[0061] In the illustrated embodiment, the spray orifices 43 are provided in an annular groove 47 which projects axially relative to the bottom 12 in the direction of the stator 4.

[0062] In order to ensure uniform cooling of the coils 27, the chamber 19 comprises at least one spray orifice 43 for each of the coils 27. In the preferred embodiment shown, the chamber 19 comprises two spray orifices 43 for each of the coils 27.

[0063] Each of the spray orifices 43 is arranged axially opposite a deflector 44, 45, visible in FIGS. 1, 8 and 9. The deflectors 44, 45 project radially towards the axis X from the inner face of the inner skirt 37 of the interconnector support 35 and are thus each located opposite one of the spray orifices 43. The deflectors 44, 45 thus make it possible to deflect the flow of cooling fluid which is oriented axially at the outlet of the spray orifices 43 to direct it radially towards the axis X, that is to say in the direction of one of the coils 27. In the advantageous embodiment which is shown, the two deflectors 44, 45 which are arranged radially outside each coil 27 are axially spaced apart from each other. This allows for a more even distribution of coolant flows along the X axis.

[0064] Thus, in the embodiment shown, among the two deflectors 44, 45 which are arranged radially outside each coil 27, one is arranged towards the middle, in the axial direction, of the coil 27 while the other is arranged close to the axial end of the coil 27 which is opposite the spray orifices 43.

[0065] Furthermore, after being sprayed against the coils 27, the cooling fluid falls, by gravity, into a cavity 46, notably visible in FIG. 3. The cavity 46 is preferably provided at the low point of the casing 2 to facilitate the evacuation of the cooling fluid. The cavity 43 leads to an outlet 48 of the cooling fluid which is here formed by a slot intended to be connected to a pipe for evacuating the cooling fluid.

[0066] Although the invention has been described in connection with several particular embodiments, it is obvious that it is in no way limited thereto and that it includes all technical equivalents of the means described as well as their combinations if these fall within the scope of the invention, as defined by the claims.

[0067] The use of the verb "comprise", "comprise" or "include" and its conjugated forms does not exclude the presence of other elements or other steps than those set out in a claim.

[0068] In the claims, any reference sign in parentheses cannot be interpreted as a limitation of the claim.

Claims

Claims

1. Electric machine (1) comprising: - a casing (2) defining a housing; - at least one rotor (3) mounted to rotate in the housing of the casing (2) around an axis X; and - at least one first stator (4) which is positioned in the housing, axially opposite the rotor (3), and which comprises: - a stator body (24) equipped with teeth (26) which project towards the rotor (3) and which are distributed around the X axis; - coils (27) which comprise a winding (33) and which are carried by the teeth (26); and - an interconnector (34) which is arranged radially outside the coils (27) and comprises an interconnector support (35) and conductive traces, said conductive traces being supported by the interconnector support (35) and connected to the windings (33);the casing (2) comprising an inlet (41) intended to be connected to a coolant supply pipe and a first chamber (19) connected to said inlet, the first stator (4) being arranged axially between the first chamber (19) and the rotor (3), the first chamber (19) comprising a plurality of spray orifices (43) which open axially opposite an annular space arranged radially between the coils (27) and the interconnector (34), each spray orifice (43) being arranged axially opposite a deflector (44, 45) which is configured to deflect a flow of coolant sprayed by said spray orifice (43) and direct it radially towards the axis X in the direction of one of the coils (27).;

2. An electrical machine (1) according to claim 1, wherein the deflector (44, 45) projects radially inwardly from the interconnector support (35).

3. An electrical machine (1) according to claim 1 or 2, wherein the winding (33) of each of the coils (27) is mounted around one of the teeth (26).

4. Electrical machine (1) according to claim 3, comprising, for each coil (27), at least one spray orifice (43) arranged in the first chamber (19) and at least one deflector (44, 45), said spray orifice (43) being arranged axially opposite said deflector (44, 45) and said deflector (44, 45) being configured to deflect the flow of cooling fluid sprayed by said spray orifice (43) and direct it radially towards the X axis in the direction of the coil (27).

5. Electrical machine (1) according to claim 3 or 4, comprising, for each coil (27), at least two spray orifices (43) arranged in the first chamber (19) and at least two deflectors (44, 45), said two spray orifices (43) being spaced from each other in the circumferential direction and arranged respectively axially opposite one and the other of said two deflectors (44, 45), said two deflectors (44, 45) being axially spaced from each other.

6. An electrical machine (1) according to any one of claims 1 to 6. 5, wherein the first chamber (19) extends radially inwardly beyond the coils (27).

7. An electrical machine (1) according to any one of claims 1 to 5. 6, in which the casing (2) comprises: - a peripheral rim (9) which extends axially and is arranged radially outside the first stator (4); - a first bottom (12) which extends radially inwards from one end of the peripheral rim (9); and - a first flange (18) which is fixed in a sealed manner to the casing (2) and is arranged opposite the first base (12), at a distance from the latter so as to provide the first chamber (19) between the first flange (18) and the first base (12).

8. Electrical machine (1) according to claim 7, in which the first stator (4) is in contact against the first bottom (12) so as to allow a heat exchange by conduction between the cooling fluid intended to be arranged in the first chamber (19) and the first stator (4).

9. An electrical machine (1) according to claim 7 or 8, wherein the rotor (3) is rotationally fixed to an output shaft (5) which is guided in rotation about the X axis by means of at least one rolling bearing (15), the first bottom (12) having an opening through which the output shaft (5) passes and an annular skirt (14) which borders said opening (13) and extends axially in the direction of the rotor (3); said rolling bearing (15) being received inside said annular skirt (14).

10. An electrical machine (1) according to any one of claims 7 to 9, wherein the first flange (18) has an annular shape and comprises an outer edge which is sealed welded to the end of the peripheral rim (9) and an inner edge which is sealed welded to a portion of the first bottom (12) which projects axially in the direction opposite the rotor (3).

11. An electrical machine (1) according to any one of claims 7 to 10, wherein the first flange (18) is fixed in a sealed manner to the housing (2) by a friction stir welding process.

12. An electrical machine (1) according to any one of claims 1 to 11, wherein the electrical machine (1) comprises a second stator (4) which is positioned in the housing, axially opposite the rotor (3), the first and second stators (4) being arranged axially on either side of the rotor (3), the second stator (4) comprising: - a stator body (24) equipped with teeth (26) which project towards the rotor (3) and which are distributed around the X axis; - coils (27) which comprise a winding (33) and are carried by the teeth (26); and - an interconnector (34) which is arranged radially outside the coils (27) and comprises an interconnector support (35) and conductive traces, said conductive traces being supported by the interconnector support (35) and connected to the windings (33);the casing (2) comprising a second chamber (19) connected to said inlet (41), the second stator (4) being arranged axially between the second chamber (19) and the rotor (3), the second chamber (19) comprising a plurality of spray orifices (43) which open axially opposite an annular space arranged radially between the coils (27) of the second stator (4) and the interconnector (34), each spray orifice (43) of the second chamber (19) being arranged axially opposite a deflector (44, 45) which is configured to deflect a flow of cooling fluid sprayed by said spray orifice (43) and direct it radially towards the axis X in the direction of one of the coils (27) of the second stator (4).;

13. Electrical machine (1) according to claim 12, in which the casing (2) comprises a second bottom (12) and a second flange (18) which is fixed in a sealed manner to the casing (2) and is arranged opposite the second bottom (12), at a distance from the latter so as to provide the second chamber (19) between the first flange (18) and the first bottom (12) and in which the second stator (4) is in contact against the second bottom (12) so as to allow a heat exchange by conduction between the cooling fluid intended to be arranged in the second chamber (19) and the second stator (4).

14. Motor vehicle comprising an electric machine according to any one of claims 1 to 13.

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