ROTATING ELECTRIC MACHINE EQUIPPED WITH A FLANGE INCORPORATING PROJECTING HEAT DISSIPATION ELEMENTS

Abstract

The present invention relates to a flange (15) of a rotating electrical machine (10) having an axis (X2), said flange (15) comprising: - a radial wall (27) extending perpendicular to the axis (X2), said radial wall (27) comprising a first internal face (28) and a first external face (29), said first internal face (28) comprising an external periphery (31) and an internal periphery (32), - a bearing housing (33) located in a central zone of the radial wall (27), - a plurality of first projecting heat dissipation elements (43) arranged on the first internal face (28) of the radial wall (27), - spaces existing between the first projecting heat dissipation elements (43) so as to allow a radial passage of air from the external periphery (31) of the first internal face (28) of the radial wall (27) to the internal periphery (32) of the first internal face (28) of the radial wall (27). Figure 2

Description

Title of the invention: ROTATING ELECTRIC MACHINE EQUIPPED WITH A FLANGE INCORPORATING PROJECTING HEAT DISSIPATION ELEMENTS

[0001] The present invention relates to a rotating electrical machine provided with a flange incorporating projecting heat dissipation elements. The invention relates to the field of rotating electrical machines such as electric motors, alternators, or alternator-starters which are reversible electrical machines capable of operating in a motor mode or a generator mode.

[0002] In a manner known per se, a rotating electrical machine comprises a rotor secured to a driving and / or driven shaft and a stator which surrounds the rotor with the presence of an air gap. The stator is carried by a housing formed by two flanges provided with bearings for the rotational mounting of the rotor shaft.

[0003] The rotor may comprise a body formed by a stack of metal sheets held in the form of a packet by means of a suitable fastening system. The rotor comprises poles formed for example by permanent magnets housed in cavities made in the magnetic mass of the rotor. Alternatively, in an architecture known as "salient" poles, the poles are formed by coils wound around arms of the rotor.

[0004] Furthermore, the stator comprises a body consisting of a stack of thin sheets forming a crown, the inner face of which is provided with notches open towards the inside to receive a winding consisting of phase windings. These windings pass through the notches and form buns projecting on either side of the body of the stator. The phase windings are obtained for example from a continuous wire covered with enamel or from conductive elements in the form of pins connected together by welding. Alternatively, in the case of a concentric type winding, the polyphase electrical machine comprises a stator winding consisting of several preformed coils mounted around the teeth of the stator by means of a coil insulator.

[0005] Document US2011 / 0304226 describes a rotating electrical machine comprising concentric heat dissipation fins arranged on the inner face of a flange. The fins of the flange are interposed with other concentric fins arranged on the outer face of the rotor to allow heat transfer from the rotor to the flange and then to a cooling circuit for extracting the calories generated by the operation of the rotating electrical machine. Such a configuration, however, requires precise adjustment of the various components of the rotating electrical machine which is difficult to obtain given the manufacturing tolerances. In addition, the fins radially block the internal air circulation of the rotating electrical machine.

[0006] The invention aims to effectively remedy this drawback by proposing a rotating electrical machine flange having an axis, said flange comprising:

[0007] - a radial wall extending perpendicular to the axis, said radial wall comprising a first internal face and a first external face, said first internal face comprising an external periphery and an internal periphery,

[0008] - a bearing housing located in a central zone of the radial wall,

[0009] - a plurality of first heat dissipation protruding elements arranged on the first internal face of the radial wall,

[0010] - spaces existing between the first protruding heat dissipation elements so as to allow a radial passage of air from the external periphery of the first internal face of the radial wall to the internal periphery of the first internal face of the radial wall.

[0011] The invention thus makes it possible, thanks to the integration of the projecting heat dissipation elements allowing radial passage of air inside the electric machine, to improve the heat transfer of hot air to the flange of the electric machine. In addition, the flange of the rotating electric machine is easy to obtain by molding. The mounting of the flange, which does not require any particular adjustment, is also easy compared to that described in document US2011 / 0304226.

[0012] According to one embodiment of the invention, a plurality of second projecting heat dissipation elements are arranged on the first external face of the radial wall.

[0013] According to one embodiment of the invention, the first projecting heat dissipation elements and / or the second projecting heat dissipation elements are pins extending axially relative to the axis of the flange.

[0014] According to one embodiment of the invention, the pins have a shape chosen from a cylindrical, truncated, parallelepiped, or trapezoidal shape.

[0015] According to one embodiment of the invention, said flange further comprises a tubular wall extending the radial wall, said tubular wall extending axially relative to the axis of the flange, said tubular wall comprising a second internal face and a second external face.

[0016] According to one embodiment of the invention, a plurality of third projecting heat dissipation elements are arranged on the second internal face of the tubular wall.

[0017] According to one embodiment of the invention, the third projecting heat dissipation elements are fins extending radially from the axis of the flange and longitudinally in an axial direction from the axis of the flange.

[0018] According to one embodiment of the invention, the first internal face of the radial wall of the The flange also includes stiffening ribs on which first projecting heat dissipation elements are arranged.

[0019] The invention also relates to a rotating electrical machine comprising:

[0020] - at least one flange as previously defined,

[0021] - a rotor, in particular with permanent magnets, and

[0022] - a stator comprising a stator body and a winding having coils of winding extending axially on either side of the stator body.

[0023] According to one embodiment of the invention, the first projecting heat dissipation elements are arranged in a first implantation zone of the first internal face of the radial wall located opposite a winding coil and in a second implantation zone of the first internal face of the radial wall located opposite an axial end of the rotor.

[0024] According to one embodiment of the invention, the first projecting heat dissipation elements arranged in the first implantation zone are shorter than the first projecting heat dissipation elements arranged in the second implantation zone.

[0025] According to one embodiment of the invention, the first projecting heat dissipation elements arranged in the first implantation zone have a smaller diameter than a diameter of the first projecting heat dissipation elements arranged in the second implantation zone.

[0026] According to one embodiment of the invention, the rotor comprises at least one fan fixed to at least one axial end of said rotor.

[0027] According to one embodiment of the invention, said rotating electrical machine comprises a cooling chamber extending circumferentially around the stator body.

[0028] According to one embodiment of the invention, the tubular wall of the flange constitutes an internal wall or an external wall of the cooling chamber.

[0029] The invention further relates to an assembly comprising a rotating electrical machine as previously defined and a speed reduction device, said rotating electrical machine being coupled with said speed reduction device.

[0030] According to one embodiment of the invention, said speed reduction device comprises a casing delimiting an internal volume containing a lubricating liquid such as oil, the second projecting heat dissipation elements extending inside the internal volume of the casing of the speed reduction device.

[0031] The present invention will be better understood and other characteristics and advantages will become apparent upon reading the detailed description which follows, comprising embodiments given for illustrative purposes with reference to the appended figures, presented as non-limiting examples, which may be used to complete the description. understanding of the present invention and the description of its implementation and, where appropriate, contributing to its definition:

[0032] [Fig.l] [Fig.l] is a top view of a rotating electrical machine according to the present invention;

[0033] [Fig.2] [Fig.2] is a longitudinal sectional view of the rotating electrical machine according to the present invention;

[0034] [Fig.3] [Fig.3] is a perspective view of a flange according to the invention belonging to the rotating electrical machine of Figures 1 and 2;

[0035] [Fig.4a][Fig.4b] Figures 4a and 4b are respectively front views and longitudinal sectional views along the section plane AA illustrating a first embodiment of a flange according to the invention;

[0036] [Fig.5a] [Fig.5b] Figures 5a and 5b are respectively front and side views longitudinal section along the section plane BB illustrating a second embodiment of a flange according to the invention;

[0037] [Fig.6] [Fig.6] is a schematic representation of an assembly formed by a rotating electrical machine and a speed reduction device.

[0038] Identical, similar, or analogous elements retain the same reference from one figure to another.

[0039] Figures 1 and 2 show a rotating electrical machine 10 comprising a housing 11 in which a fixed stator 12 and a rotor 13 are mounted. The rotor 13 is carried by a shaft 14 mounted to rotate relative to two flanges 15, 16 of the housing 11. The electrical machine 10 has an axis XI corresponding to the axis of rotation of the rotor 13 as well as to the axis of the stator 12. The shaft 14 may comprise a pinion 18 at one of its ends so as to be able to mesh with an external mechanical element, such as a pinion of a speed reducer.

[0040] The rotor 13 comprises a body formed by a stack of metal sheets held in the form of a packet by means of a suitable fastening system comprising, for example, rivets. The rotor 13 comprises poles formed, for example, by permanent magnets housed in cavities formed in a magnetic mass of the rotor 13. Alternatively, in an architecture known as "salient" poles, the poles are formed by coils wound around arms of the rotor 13. Alternatively, the rotor 13 may be a claw rotor known as a "claw pole rotor" type in English.

[0041] Furthermore, the stator 12 comprises a body 19 consisting of a stack of thin sheets forming a crown, the inner face of which is provided with notches open towards the inside to receive a winding 20. The winding 20 comprises coils 21 extending in axial projection on either side of the stator body 19.

[0042] The winding 20 may be constituted by phase windings obtained for example from a continuous wire covered with enamel or from conductive elements in the form of pins connected together by welding. Alternatively, in the case of a concentric type winding 20, the winding 20 is constituted by several preformed coils mounted around the teeth of the stator 12 by means of a coil insulator.

[0043] In order to evacuate the calories generated by an operation of the stator 12, the flanges of the housing 11 define a cooling chamber 23 extending circumferentially around the stator body 19. The cooling chamber 23 is associated with a cooling liquid inlet 24 through which a cooling liquid penetrates inside said cooling chamber 23 and a cooling liquid outlet 25 through which the cooling liquid leaves the cooling chamber 23, as shown in [Fig. 1]. The cooling liquid may for example be water containing antifreeze. Alternatively, the cooling liquid may consist of oil or any other heat transfer liquid suitable for the application.

[0044] More precisely, as can be seen in [Fig. 3], the flange 15 of axis X2 comprises a radial wall 27 extending perpendicularly to the axis X2. The radial wall 27 comprises a first internal face 28 intended to be turned towards the inside of the rotating electrical machine 10 and a first external face 29 intended to be turned towards the outside of the rotating electrical machine 10. The first internal face 28 and the first external face 29 extend in a radial plane relative to the axis X2. The first internal face 28 has an external periphery 31 and an internal periphery 32.

[0045] A bearing housing 33 is located in a central area of ​​the radial wall 27. The bearing housing 33 is intended to receive a bearing 35 for the rotational mounting of one end of a shaft 14 carrying the rotor 13.

[0046] The flange 15 further comprises a tubular wall 38 extending the radial wall 27. The tubular wall 38 extends axially relative to the axis X2 of the flange 15. The tubular wall 38 comprises a second internal face 39 facing towards the inside of the rotating electrical machine 10 and a second external face 40 facing towards the outside of the rotating electrical machine 10.

[0047] The flange 15 is preferably made of a material that is a good heat conductor, such as a metallic material. The flange 15 may be made by molding, machining, or any other manufacturing process suitable for the application.

[0048] A plurality of first heat dissipation protruding elements 43 are arranged on the first inner face 28 of the radial wall 27. Spaces 44 exist between the heat dissipation protruding elements 43 so as to allow a radial passage of air between the outer periphery 31 and the inner periphery 32 of the first inner face 28 of the wall 27. By "radial passage of air" is meant the fact that air can circulate generally in a radial direction between the external periphery 31 and the internal periphery 32 of the machine while licking the projecting heat dissipation elements 43 but also the fact that air can circulate in a sinuous path between the projecting heat dissipation elements 43 to reach the internal periphery 32 of the first internal face 28 of the radial wall 27 when the projecting heat dissipation elements 43 are circumferentially offset relative to each other.

[0049] Advantageously, as can be seen in [Fig. 2], the first projecting heat dissipation elements 43 are arranged in a first implantation zone 46 of the first internal face 28 of the radial wall 27 located opposite a winding bun 21 and in a second implantation zone 47 of the first internal face 28 of the radial wall 27 located opposite an axial end of the rotor 13. By "located opposite", we mean the fact that there is at least one straight line DI parallel to the axis XI of the machine (respectively D2) passing through the first implantation zone 46 (respectively the second implantation zone 47) and the corresponding winding bun 21 (respectively the axial end of the rotor 13).

[0050] As can be seen in Figures 4a and 5a, the first heat dissipation protruding elements 43 of the first implantation zone 46 are arranged in two circumferential rows. The circumferential rows are circumferentially offset from each other, so that the first heat dissipation protruding elements 43 of the two rows are not aligned in a radial direction relative to the axis X2. The number of rows and the configuration of the heat dissipation protruding elements 43 within the rows located in the first implantation zone 46 may of course vary depending on the application.

[0051] In the embodiment of Figures 4a and 4b, the first heat dissipation protruding elements 43 of the second implantation zone 47 are arranged in radial rows in which the heat dissipation protruding elements 43 are aligned with respect to each other. In the embodiment of Figures 5a and 5b, the first heat dissipation protruding elements 43 of the second implantation zone 47 have radial and circumferential offsets with respect to each other. The number of rows and the configuration of the heat dissipation protruding elements 43 within the rows located in the second implantation zone 47 may of course vary depending on the application.

[0052] As illustrated by [Fig.5b], the first projecting heat dissipation elements 43 arranged in the first implantation zone 46 may be axially shorter than the first projecting heat dissipation elements 43 arranged in the second implantation zone 47. In other words, the first projecting heat dissipation elements 43 arranged in the second zone implantation zones 47 have a height greater than the height of the first projecting heat dissipation elements 43 arranged in the first implantation zone 46. Advantage is thus taken of the clearance existing inside the electric machine 10 opposite the rotor 13 to increase the height of the projecting heat dissipation elements 43 located in the second implantation zone 47.

[0053] Advantageously, for first projecting heat dissipation elements 43 having a circular cross-section, the first projecting heat dissipation elements 43 arranged in the first implantation zone 46 have a smaller diameter than a diameter of the first projecting heat dissipation elements 43 arranged in the second implantation zone 47. As a variant, all of the first projecting heat dissipation elements 43 may have the same diameter.

[0054] A density of first protruding heat dissipation elements 43 in a given implantation zone is defined as being the ratio expressed in percents between the sum of the areas of the cross-sections of the first protruding heat dissipation elements 43 considered in a median plane of the first protruding heat dissipation elements 43, that is to say at mid-height, divided by the total area of ​​the implantation zone 46, 47. According to an exemplary embodiment, the density of the first protruding heat dissipation elements 43 located in the first implantation zone 46 of large diameter is for example between 5% and 60%. The density of the first protruding heat dissipation elements 43 located in the second implantation zone 47 of small diameter is for example between 5% and 60%.The density of the first heat dissipation protruding elements 43 in the first large diameter implantation zone 46 is preferably greater than the density of the first heat dissipation protruding elements 43 in the second small diameter implantation zone 47.

[0055] As can be seen in [Fig.4a], the first internal face 28 of the radial wall 27 of the flange 15 may comprise stiffening ribs 48.1, 48.2 on which first projecting heat dissipation elements 43 are arranged. At least one rib 48.1 extending in a radial direction and / or at least one rib 48.2 extending in a circumferential direction may be provided. A rib 48.2 extending in the circumferential direction may form a boundary between the first implantation zone 46 and the second implantation zone 47.

[0056] Preferably, the first projecting heat dissipation elements 43 are pins extending axially relative to the axis of the flange 15. The pins have a shape chosen from a cylindrical, truncated cone, parallelepiped, or trapezoidal shape. Alternatively, the first projecting heat dissipation elements 43 may be constituted by fins extending along a portion of the circumference of the flange. 15 and spaced apart by a circumferential space allowing radial passage of air.

[0057] As can be seen in [Fig.4b], a plurality of second projecting heat dissipation elements 50 may be arranged on the first external face 29 of the radial wall 27 of the flange 15. The second projecting heat dissipation elements 50 are similar to the first projecting heat dissipation elements 43. Thus, the second projecting heat dissipation elements 50 are preferably pins extending axially relative to the axis X2 of the flange 15. The pins have a shape chosen from a cylindrical, truncated cone, or parallelepiped shape. Alternatively, the second projecting heat dissipation elements 50 may be constituted by fins extending along a portion of the circumference of the flange 15. Optionally, these fins may be spaced apart by a circumferential space allowing radial passage of air.

[0058] A plurality of third projecting heat dissipation elements 53 visible in Figures 2 and 4b may be arranged on the second internal face 39 of the tubular wall 38. The third projecting heat dissipation elements 53 are arranged outside the portion of the second internal face 39 of the tubular wall 38 carrying the stator 12. The third projecting heat dissipation elements 53 are preferably fins extending radially with respect to the axis X2 of the flange 15 and longitudinally in an axial direction with respect to the axis X2 of the flange 15. This makes it easier to demould the flange 15 which is carried out in an axial direction.

[0059] When the rotating electrical machine 10 is in operation, the rotation of the rotor 13 generates an air flow loop inside the rotating electrical machine 10 referenced 55 in [Fig. 2]. In this case, due to the centrifugal movement, the air flow moves from the inner periphery 32 to the outer periphery 31 of the rotor 13 and then brushes against the third projecting heat dissipation elements 53. As indicated previously, the air can then move radially from the outer periphery 31 to the inner periphery 32 of the first inner face 28 of the radial wall 27 while brushing against the first projecting heat dissipation elements 43 to extract the calories therefrom.

[0060] In order to amplify the movement of air inside the rotating electrical machine 10, it is possible to fix at least one fan 56 on at least one axial end of said rotor 13. The fan 56 preferably comprises axial blades. The fan 56 may be of the same type as that described in document WO13136021.

[0061] Furthermore, as can be seen in [Fig.2], the flange 16 has a configuration similar to the flange 15. Thus, the flange 16 of axis X3 has a radial wall 60 extending perpendicular to the axis X3. A bearing housing 61 is located in a central zone of the radial wall 60. The bearing housing 61 is intended to receive a bearing 35 for the rotational mounting of one end of the shaft 14. The flange 16 further comprises a tubular wall 62 extending the radial wall 60. The tubular wall 62 extends axially relative to the axis X3 of the flange 16. The flange 16 may be made of the same material as the flange 15.

[0062] In the embodiment shown in [Fig. 2], the flange 16 is devoid of projecting heat dissipation elements. However, as a variant, the flange 16 may comprise first projecting heat dissipation elements 43 and / or second projecting heat dissipation elements 50 and / or third projecting heat dissipation elements 53.

[0063] The tubular wall 38 of the flange 15 constitutes the internal wall of the cooling chamber 23 while the tubular wall 62 of the flange 16 constitutes the external wall of the cooling chamber 23. Of course, the structure could be reversed, that is to say that the tubular wall 62 of the flange 16 could constitute the internal wall of the cooling chamber 23 while the tubular wall 38 of the flange 15 could constitute the external wall of the cooling chamber 23. The configuration depends on the diameters of the tubular walls 38, 62 of the two flanges 15, 16.

[0064] As can be seen in Figures 2 and 3, the second external face 40 of the tubular wall 38 of the flange 15 constituting the internal wall of the cooling chamber 23 may be provided with cooling fins 63 extending in radial projection inside the cooling chamber 23, as shown in Figures 2 and 3. These fins 63 may have a circumferential or axial longitudinal elongation direction, that is to say that the largest dimension of these fins 63 may extend along at least a portion of the circumference of the second external face 40 or parallel to an axis of the second external face 40. The fins 63 may also have a heliocoidal shape.

[0065] The stator body 19 may be mounted shrink-fitted inside the space delimited by the tubular wall 38 of the flange 15. The external periphery of the stator body 19 being in intimate contact with the internal periphery 32 of the tubular wall 38 due to the shrink-fitting operation, this makes it easier to evacuate by conduction the heat generated by the winding 20 towards the cooling chamber 23.

[0066] The assembly of the two flanges 15, 16 may be carried out by means of at least one screw 64 cooperating with openings provided in ears 65, 66 coming respectively from the flange 15 and the flange 16.

[0067] As illustrated by [Fig.6], the rotating electrical machine 10 may be coupled with a speed reduction device 68. The speed reduction device 68 may be a gearbox used in combination with a heat engine or a dedicated speed reducer associated with the rotating electrical machine 10 for adapting the very high rotation speed of said rotating electrical machine 10 to the speed of the wheels of the motor vehicle.

[0068] The speed reduction device 68 comprises a casing 70 delimiting an internal volume 71 containing a lubricating liquid such as oil. Advantageously, the second projecting heat dissipation elements 50 extend inside the internal volume 71 of the casing 70 of the speed reduction device 68.

[0069] The speed reduction device 68 may integrate a temperature sensor 73. Depending on the operating situation of the assembly and the temperature of the oil contained in the casing 70, it is possible to take advantage of the oil from the speed reduction device 68 to improve the cooling of the rotating electrical machine 10 or to use the cooling chamber 23 to extract calories from the oil from the speed reduction device 68.

[0070] Alternatively, for a rotating electrical machine 10 exclusively air-cooled, the rotating electrical machine 10 is devoid of a cooling chamber 23.

[0071] Alternatively, the rotating electrical machine 10 is devoid of a cooling chamber 23 and comprises an oil cooling system via the rotor as described in patent EP3320601.

[0072] As a variant, one of the flanges 15, 16 comprises the two tubular walls 38, 62 radially delimiting the cooling chamber 23, which is closed by the other flange 15, 16 comprising only one radial wall 27, 60 forming a cover for the cooling chamber 23.

[0073] In the example shown, the flanges 15, 16 are single-piece parts. Alternatively, a flange 15, 16 may be formed from a separate tubular wall 38, 62 and assembled with the radial wall 27, 60.

[0074] Of course, the various features, variants and / or embodiments of the present invention may be combined with each other in various combinations to the extent that they are not incompatible or mutually exclusive.

[0075] Furthermore, the invention is not limited to the embodiments described above and provided solely by way of example. It encompasses various modifications, alternative forms and other variants that may be envisaged by those skilled in the art within the scope of the present invention and in particular all combinations of the different operating modes described above, which may be taken separately or in association.

Claims

Claims

1. Flange (15) of a rotating electrical machine (10) having an axis (X2), said flange (15) comprising: - a radial wall (27) extending perpendicular to the axis (X2), said radial wall (27) comprising a first internal face (28) and a first external face (29), said first internal face (28) comprising an external periphery (31) and an internal periphery (32), - a bearing housing (33) located in a central zone of the radial wall (27), said flange (15) further comprises: - a plurality of first projecting heat dissipation elements (43) arranged on the first internal face (28) of the radial wall (27), - spaces (44) existing between the first projecting heat dissipation elements (43) so as to allow a radial passage of air from the external periphery (31) of the first internal face (28) of the wall radial (27) towards the internal periphery (32) of the first internal face (28) of the radial wall (27),characterized in that a plurality of second projecting heat dissipation elements (50) are arranged on the first external face (29) of the radial wall (27),

2. Flange according to claim 1, characterized in that the first heat dissipation protruding elements (43) and / or the second heat dissipation protruding elements (50) are pins extending axially relative to the axis (X3) of the flange (15).

3. Flange according to claim 2, characterized in that the pins have a shape chosen from a cylindrical, truncated, parallelepiped, or trapezoidal shape.

4. Flange according to any one of claims 1 to 3, characterized in that it further comprises a tubular wall (38) extending the radial wall (27), said tubular wall (38) extending axially relative to the axis (X2) of the flange (15), said tubular wall (38) comprising a second internal face (39) and a second external face (40).

5. Flange according to claim 4, characterized in that a plurality of third projecting heat dissipation elements (53) are arranged on the second internal face (40) of the tubular wall (38).

6. Flange according to reservation 5, characterized in that the third projecting heat dissipation elements (53) are fins extending radially projecting relative to the axis (X2) of the flange (15) and longitudinally in an axial direction relative to the axis (X2) of the flange (15).

7. Flange according to any one of claims 1 to 6, characterized in that the first internal face (28) of the radial wall (27) of the flange (15) further comprises stiffening ribs (48.1, 48.2) on which first projecting heat dissipation elements (43) are arranged.

8. Rotating electrical machine (10) characterized in that it comprises: - at least one flange (15) as defined according to any one of the preceding claims, - a rotor (13), in particular with permanent magnets, and - a stator (12) comprising a stator body (19) and a winding (20) having winding coils (21) extending axially on either side of the stator body (19).

9. Rotating electrical machine according to claim 8, characterized in that the first projecting heat dissipation elements (43) are arranged in a first implantation zone (46) of the first internal face (28) of the radial wall (27) located opposite a winding coil (21) and in a second implantation zone (47) of the first internal face (28) of the radial wall (27) located opposite an axial end of the rotor (13).

10. Rotating electrical machine according to claim 9, characterized in that the first heat dissipation protruding elements (43) arranged in the first implantation zone (46) are shorter than the first heat dissipation protruding elements (43) arranged in the second implantation zone (47).

11. A rotating electrical machine according to claim 9 or 10, characterized in that for first heat dissipation protruding elements (43) having a circular cross-section, the first heat dissipation protruding elements (43) arranged in the first implantation zone (46) have a smaller diameter than a diameter of the first heat dissipation protruding elements (43) arranged in the second implantation zone (47).

12. Rotating electrical machine according to any one of claims 8 to 13, characterized in that the rotor (13) comprises at least one fan (56) fixed on at least one axial end of said rotor (13).

13. Assembly characterized in that it comprises an electric machine rotating machine (10) as defined according to any one of claims 8 to 12 and a speed reduction device (68), said rotating electrical machine (10) being coupled with said speed reduction device (68).

14. Assembly according to claims 1 and 13, characterized in that said speed reduction device (68) comprises a casing (70) delimiting an internal volume (71) containing a lubricating liquid such as oil, the second projecting heat dissipation elements (50) extending inside the internal volume (71) of the casing (70) of the speed reduction device (68).

Images