Housing comprising a heat sink equipped with fins oriented with a non-zero angle of incidence

Abstract

Casing comprising a heat sink equipped with fins oriented with a non-zero angle of incidence The casing (5) comprises a heat sink (6) located between an internal part (10) and an external part (11) and comprising a plurality of fins (8) comprising a body which rises from the external face (102) of the internal part, said body extending in projection towards the external part, these fins (8) being distributed in a plurality of lines (L) parallel to their axial direction (DA). The heat sink (6) comprises a plurality of separating walls (12) each extending in a plane parallel to their axial direction (DA) and delimiting a plurality of flow volumes (13) comprising at least one line (L) of fins comprising fins (8) whose body is oriented at an angle of incidence (β) relative to their axial direction (DA), with (β) being non-zero for at least one fin (8) of said line (L). Figure to be published with the abstract: Figure 4

Description

Title of the invention: Housing comprising a heat sink equipped with fins oriented with a non-zero angle of incidence TECHNICAL FIELD OF THE INVENTION

[0001] The technical field of the invention is that of intelligent electric motors for aircraft.

[0002] The present invention relates to an external casing for an intelligent aircraft electric motor, and in particular to a casing comprising outwardly projecting fins.

[0003] The invention finds applications in the aeronautical field, in particular for intelligent motors used in the context of hybrid thermal / electric propulsion systems for aircraft, for converters intended for propulsive applications such as vertical take-off and landing (VTOL) aircraft, and for converters for non-propulsive applications such as for example variable speed constant frequency (VSCF) current systems. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0004] An example of an intelligent engine for aircraft according to the prior art, or “Smart Motor” in English, is illustrated in [Fig.l] and [Fig.2] and is described in patent FR3091063B1 in the name of the applicant.

[0005] The intelligent motors 1' usually comprise an electromechanical converter 2' provided with a rotor 3' and a polyphase stator 4', a cylindrical casing 5' equipped with a heat sink 6', and an electronic control unit comprising a plurality of electronic cards 7'.

[0006] In operation, these electronic cards 7' heat up considerably and need to be cooled to avoid deterioration. Thus, an essential role of the heat sink 6' is to cool not only the casing 5', but also to cool by conduction the electronic cards 7' which are mounted on the underside of the casing 5'. The heat sink 6' is usually provided with cooling fins 8' projecting radially outwards. These fins 8' make it possible to cool the casing 5' and the electronic cards 7' with the air which circulates through the heat sink 6' when the aircraft moves. These fins 8' can be surrounded by an external casing (not shown), also designated by the English term "shroud", which serves mainly to channel the flow and to delimit the flow veins of the cooling air.They usually extend in a radial direction in which the rotor 3' and the stator 4' of the intelligent motor 1' extend so that the re air. cooling circulates through the 8' fins in an axial direction.

[0007] In order to produce sufficient cooling, the fins 8' have a significant radial height, which disadvantageously represents a high overall size, weight and cost for the intelligent motor 1'.

[0008] There is therefore a need for a heat sink that is less bulky, less heavy and less expensive for a given thermal performance. Summary of the invention

[0009] The invention provides a solution to the problems mentioned above by providing a heat sink whose fins have a considerably reduced radial height compared to that of the prior art, while providing at least an equal cooling effect. This result is achieved by adding to at least some fins an airflow deflection role in addition to their convection and conduction cooling effect.

[0010] One aspect of the invention relates to a smart motor casing, comprising a hollow cylindrical portion defining an axial direction DA, a radial direction DR and a tangential direction DT, said cylindrical portion comprising: • a cylindrical internal part, • a heat sink located on the internal part and thermally connected to it, and comprising a plurality of fins comprising a body which rises from the external face of the internal part and extends projecting outwards, these fins being distributed in a plurality of lines L parallel to their axial direction DA, and characterized in that: • the heat sink also includes: • a plurality of separating walls each extending in a plane P defined by their radial direction DR and their axial direction DA; • a plurality of flow volumes each delimited by the internal part and two successive separating walls; • at least one line L of fins located in at least one flow volume, the body of which is oriented at an angle of incidence [3 relative to their axial direction DA, said angle of incidence [3 being non-zero for at least one fin of said line L.

[0011] Thanks to the invention, the cooling air circulates through the fins in a substantially helical rather than linear movement, as illustrated in [Fig. 15] and [Fig. 16]. Indeed, the air flow is confined in flow volumes where fins oriented with a non-zero angle of incidence give it an ideally helical movement with a propeller axis substantially parallel to the axial direction, for better heat transfer taking place by radial conduction. and by convection at the level of the two sides of the fins.

[0012] Thus, for an equivalent cooling effect, the conductive part of the fin can be lightened by shortening and thinning it. In order to maintain a satisfactory exchange surface, the number of shortened and thinner fins is multiplied. Also, convective cooling on the fins is more effective near the leading edge, the cumulative lengths of which are multiplied.

[0013] The separating walls are fins which do not participate in the helical movement, but delimit the air flow and can therefore extend over the entire length of the casing, maximizing its filling.

[0014] According to one aspect of the invention, the heat sink comprises at least one line L of fins located in at least one flow volume and comprising n fins 8b 82, ... 8n with n > 2, the body of which is oriented according to an angle of incidence [3i, [32, ... [3n relative to their axial direction DA such that 0° < ipj < l[32l < ... < l[3J < 35°, more preferably such that 0° < l[3il < l[32l < ... < l[3J < 20°, which advantageously makes it possible to gradually deflect the air in a substantially helical displacement.

[0015] According to another aspect of the invention, the heat sink further comprises at least one line L of fins located in at least one flow volume and the body of which is inclined in their tangential direction DT by a non-zero angle of inclination α relative to their radial direction DR.

[0016] According to an additional aspect of the invention, the angle of inclination a is such that 5° < lal < 60°, more preferably such that 10° < lal < 45°.

[0017] The combination of angles α and [3 advantageously makes it possible to generate a satisfactory helical movement for the flow of air through the fins without slowing down said flow excessively. These angles can advantageously be optimized so that at cruising speed, the flow of air preferably makes substantially between two thirds and one helix turn over the entire axial length of the heat sink.

[0018] According to one aspect of the invention, the heat sink comprises, in at least one flow volume, at least two lines L of fins, of which at least one line L of fins has a positive inclination angle α and at least one line L of fins has a negative inclination angle α.

[0019] According to another aspect of the invention, the heat sink comprises, in at least one flow volume, at least one transverse row R of fins comprising m successive fins with m > 2 whose body is inclined in their tangential direction DT by an angle of inclination ai, a2, ... am such that laj < la2l < ... < laml.

[0020] According to a further aspect of the invention, the heat sink further comprises at least one additional separating wall which extends in a defined plane PS by its radial direction DR and its axial direction DA and which compartmentalizes a flow volume into two flow sub-volumes. Such a wall advantageously makes it possible to compartmentalize each flow volume so as to give each flow sub-volume a geometry approaching that of a cylinder of circular section, which is the shape most suitable for generating an air flow along a helical and circular path.

[0021] According to another aspect of the invention, the additional separating wall is equidistant from the two separating walls delimiting the flow volume that it compartmentalizes. Such a geometry advantageously makes it possible to have the same cooling effect in each flow sub-volume, and therefore to better control the overall cooling of the heat sink.

[0022] According to a further aspect of the invention, at least one other line L of fins is located between the two lines L of fins whose fins have a body inclined in their tangential direction DT from one line L of fins towards the other line L of fins. This configuration advantageously makes it possible to additionally promote the formation of a helical movement in the air flow and to fill the space with more fins with a rather homogeneous distribution.

[0023] According to one aspect of the invention, at least one separating wall or one additional separating wall is connected to the external face of the internal part by a fillet connection. These fillet shapes advantageously give an at least partially rounded contour to the section of each flow volume so as to give it a shape approaching that of a cylinder of circular section.

[0024] According to a further aspect of the invention, at least one fin has at least one of the following characteristics: • it has reliefs and / or hollows on at least one side; • it has an arched profile; • it has a curved intrados and extrados with different curvatures different; • it presents a twist, the angle of incidence of the fin not being constant over its height; • it has a rounded trailing edge; • it has an angular trailing edge; • it has a rounded leading edge; and • it has an angular leading edge.

[0025] These characteristics advantageously make it possible to increase the heat dissipation effect of the fins by reducing pressure losses.

[0026] According to one aspect of the invention, at least one fin and the internal part are part of a single part made of thermally conductive material which is the product of a fa additive manufacturing. Indeed, this manufacturing technique advantageously makes it possible to manufacture fins with complex geometry.

[0027] According to another aspect of the invention, at least one fin comprises a downstream trailing edge having at least one notch of substantially triangular shape, this notch in particular making it possible to minimize the use of support when the fins are produced by additive manufacturing from downstream to upstream.

[0028] According to a further aspect of the invention, the cylindrical portion comprises an upstream part and a downstream part which have a different cross-sectional shape, and at least two successive fins circumferentially and located in an upstream zone of the downstream part are connected to each other by a fin of which a downstream edge is inclined towards the internal part. This fin advantageously makes it possible to bring the air flow back towards the fins of the downstream part of the internal part when it encounters an obstacle due to a change in geometry between the upstream part and the downstream part of the cylindrical portion.

[0029] According to another of the invention, the cylindrical portion further comprises a cylindrical outer part concentric with the inner part, the heat sink being located between the inner part and the outer part, and the heat sink comprises a plurality of additional cooling fins which project towards the inner part from an inner face of the outer part. These additional fins advantageously promote the deflection of the cooling air flow, in particular when they have a geometry similar to that of the fins of the inner part.

[0030] Another aspect of the invention relates to an intelligent motor equipped with a casing as described above, which advantageously has a lower weight and size than intelligent motors equipped with a conventional heat sink, for an at least equivalent cooling effect.

[0031] A further aspect of the invention relates to an aircraft equipped with a smart engine as described above.

[0032] The invention and its various applications will be better understood upon reading the following description and examining the accompanying figures. BRIEF DESCRIPTION OF THE FIGURES

[0033] The figures are presented for information purposes only and in no way limit the invention.

[0034] [Fig. 1] is a schematic perspective view of an intelligent motor according to the prior art whose casing does not include an external casing.

[0035] [Fig.2] is a view similar to [Fig.l] where the downstream face is open.

[0036] [Fig.3] is a schematic perspective view of an intelligent motor equipped with a casing according to the invention and whose downstream face is open.

[0037] [Fig.4] is a perspective view of a sector of the downstream part of a casing according to the invention whose external part is shown transparent.

[0038] [Fig.5] is a perspective view of a detail of a sector of the downstream part of the casing of [Fig.4] limited to a single flow volume separated into two half-volumes separated by an additional separating wall and where the external part is not shown.

[0039] [Fig.6] is a downstream side front view of the flow volume of [Fig.5].

[0040] [Fig.7] is an external radial view of the flow volume of [Fig.5].

[0041] [Fig.8] is a sectional view of the flow volume of [Fig.5] in a plane per pendicular to the motor axis.

[0042] [Fig.9] is a sectional view in an axial plane parallel to the motor axis at the level of the foot of the fins of the flow volume of [Fig.7] where the fins all have the same angle of incidence [3 within the same line, for example where the helical movement is established.

[0043] [Fig. 10] is a sectional view in an axial plane parallel to the engine axis at the level of the foot of the fins of the flow volume of [Fig.7] where the fins have a different angle of incidence [3 within the same line, and increasing as one moves downstream.

[0044] [Fig. 11] is a perspective view of a sector of the upstream and external part of a casing according to the invention seen from the inside, with fillet shapes in the corners of the walls delimiting the flow volumes.

[0045] [Fig. 12] is a perspective view of a flow sub-volume of the downstream part of a casing according to the invention with fillet shapes in the corners for the external part and chamfered shapes for the internal part of the walls delimiting said flow sub-volume.

[0046] [Fig. 13] is a perspective view of a middle zone of a casing according to the invention where the helical movement is established, whose fins are equipped with a fin and where there is a change in the air stream section from cylinder to plane facet.

[0047] [Fig. 14] is a sectional view similar to [Fig.8], but where the external part of the casing is shown equipped with additional fins.

[0048] [Fig. 15] is a view similar to [Fig.8] where the substantially helical movement of the cooling air is represented by white arrows.

[0049] [Fig. 16] is a view similar to [Fig. 14] where the substantially helical movement of the cooling air is represented by white arrows.

[0050] [Fig. 17] is a view of a fin profile which has a cambered profile and a greater thickness in the middle.

[0051] It will be noted that [Fig.4] to [Fig. 10] and [Fig. 12] to [Fig. 16] illustrate only the downstream part of a casing according to the invention. The upstream part of said casing is however very similar to the downstream part, except that the internal part has a circular section in the upstream part rather than a polygonal one. DETAILED DESCRIPTION

[0052] Unless otherwise specified, the same element appearing in different figures has a single reference.

[0053] By convention, in the present application, the terms “upstream” and “downstream” are defined relative to the direction of flow E of the air in the intelligent engine, this direction of flow E being represented by white arrows in the figures.

[0054] Similarly, the terms "inner" and "outer" and "internal" and "external" are defined radially relative to the radial direction DR of the casing.

[0055] By "line" of fins is meant an aligned set or group of fins.

[0056] Finally, the axial direction DA, the radial direction DR and the tangential direction DT, in particular for a fin, are defined relative to the external surface of the cylindrical internal part on which said fin is located, this cylindrical internal part being for example of polygonal, circular or other section. The radial direction DR is a direction passing through the axis of the cylindrical internal part. For the additional fins, these directions are defined relative to the internal surface of the cylindrical external part on which these fins are located.

[0057] A tangential direction DT is orthogonal to the axial direction DA.

[0058] The tangential direction DT of a fin is similar to the circumferential direction thereof when the cylindrical internal part has an external surface of circular section.

[0059] An intelligent motor 1 equipped with a casing 5 according to the invention is illustrated in [Fig.3].

[0060] A smart motor 1 is composed of an electromechanical converter 2 and its coaxial control electronics. To simplify the industrial diagram, the smart motor 1 preferably has its own half-casing, usually cylindrical with a round section, and the electronics has its own half-casing, usually cylindrical with a polygonal section. The two half-casings are usually bolted coaxially to form the casing 5 which encloses the entire smart motor 1.

[0061] Conventionally, the casing 5 is equipped with a heat sink 6 and contains an electromechanical converter 2 comprising a rotor 3 and a stator 4, and an electronic control unit comprising a plurality of electronic cards 7 located on the underside of the casing 5.

[0062] The casing 5 comprises a hollow cylindrical portion 9 with a circular and / or polygonal base, forming a crown defining a radial direction DR and an axial direction DA corresponding to the axis of revolution of the cylinder when it has a circular base.

[0063] The cylindrical portion 9 comprises a cylindrical internal part 10, having an internal face 101 equipped with the heat sink 6 and an external face 102. The portion cylindrical 9 may also comprise a cylindrical external part 11, having an internal face 111 and an external face 112. The external part 11 is larger than the internal part 10 and concentric with it so that the heat sink 6 is located between these two parts 10, 11.

[0064] According to one embodiment of the invention, the cylindrical portion 9 comprises an upstream part 9a (see [Fig.3] where the electromechanical converter 2 is preferably housed and a downstream part 9b (see [Fig.4]) where the electronic cards 7 are preferably housed.

[0065] Conventionally, the heat sink 6 comprises a plurality of fins 8 having a cooling role, and comprising a body which rises towards the external part 11 in a general direction A from the external face 102 of the internal part 10 (see [Fig.5], [Fig.6] and [Fig.7]). The fins 8 are distributed in a plurality of lines L parallel to their axial direction DA. Each line L of fins 8 preferably comprises n fins 8i, 82, ... 8n with n > 2.

[0066] Although in the figures the fins 8 are distributed in lines and rows which intersect at right angles, they can also be arranged in a staggered pattern.

[0067] Each fin 8 has a body comprising a foot 85 by which it is positioned on the external face 102 of the internal part 10, a free end 87, located opposite the foot 85, a leading edge 82 located on the upstream side, a trailing edge 81 located on the downstream side and two sides 88 delimited by these four parts 81, 82, 85, 87. The leading edge 82 is preferably rectilinear.

[0068] The heat sink 6 comprises a plurality of separating walls 12 each extending in a plane P, substantially radial, parallel to their axial direction Da. The plane P preferably passes through the central longitudinal axis of the casing 5, it is then defined by the axial direction DA and the radial direction DR of each separating wall.

[0069] The heat sink 6 comprises a plurality of flow volumes 13 each delimited between the internal part 10, the external part 11 (if present) and two successive separating walls 12.

[0070] According to one embodiment of the invention, the heat sink 6 also comprises a plurality of technical volumes 16, each located between two flow volumes 13, and each delimited by the internal part 10, the external part 11 and two successive separating walls 12. Each technical volume is preferably occupied by elements making it possible to connect the internal part 10 and the external part 11.

[0071] The heat sink 6 is characterized in that, in at least one flow volume, it comprises at least one line L of fins 8 whose body is inclined in their tangential direction DT by a non-zero angle of inclination a relative to their radial direction DR.

[0072] Preferably the angle a is such that 5° < lal < 60°, more preferably such that 10° < lal < 45°.

[0073] According to one embodiment of the invention, the heat sink 6 further comprises at least one additional separating wall 14 which extends in a plane PS defined by its radial direction DR and its axial direction D, and which compartmentalizes a flow volume 13 into two flow sub-volumes 13A, 13B, in particular in order to form flow sub-volumes 13A, 13B whose section is as close as possible to a circle.

[0074] When a flow volume 13 comprises a single additional separating wall 14, the latter is preferably equidistant from the two separating walls 12 delimiting the flow volume 13 which it compartmentalizes.

[0075] When a flow volume 13 comprises several additional separating walls 14, these and the two separating walls 12 delimiting the flow volume 13 which they compartmentalize are located equidistant from each other. The flow volume 13 is then compartmentalized into more than two flow sub-volumes 13 A.

[0076] It will be noted that a separating wall 12 or an additional separating wall 14 can be likened to a fin which would cover the entire axial length of the flow volume 13 and whose plane preferably passes through the motor axis.

[0077] In order to form flow sub-volumes 13A, 13B whose section is as close as possible to a circle, according to one embodiment of the invention at least one separating wall 12 is connected to the external face 102 of the internal part 10 and / or to the internal face 111 of the external part 11 by a fillet connection 121, 122 (see [Fig. 11] and [Fig. 12]). Similarly, at least one additional separating wall 14 is preferentially connected to the external face 102 of the internal part 10 and / or to the internal face 111 of the external part 11 by a fillet connection 141, 142.

[0078] By fillet is meant a surface with a partial circular section of concave shape intended to connect two surfaces forming a re-entrant angle.

[0079] Each flow volume 13 or flow sub-volume 13A, 13B preferably comprises several lines L of fins, including at least one line L of fins 8 having a positive angle α and at least one line L of fins 8 having a negative angle α, that is to say that it preferably comprises at least two lines L of fins facing each other, where the body of the fins 8 of these lines L is mutually inclined from one line L towards another line L.

[0080] Each flow volume 13 or flow sub-volume 13A, 13B preferably comprises at least one transverse row R of fins 8 comprising m successive fins with m > 2 whose body is inclined in their tan- gential DT of an inclination angle a2, ... am such that Icql < la2l < ... < laml, that is to say that within the same row R the inclination angle a of the fins 8 evolves, preferably linearly, from one fin 8 to another adjacent fin 8 (see [Fig.8]). In the same flow volume 13, within the same row R, the inclination angle a of the fins 8 evolves preferentially uniformly from the outside towards the center of said flow volume 13.

[0081] According to one embodiment of the invention, each flow volume 13 or flow sub-volume 13A, 13B also comprises at least one line L of non-inclined fins 8.

[0082] According to a preferred embodiment of the invention, each flow volume 13 or flow sub-volume 13A, 13B also comprises at least one line L of fins 8 having a body inclined in their tangential direction DT, and located between two other lines L of fins 8.

[0083] The fins according to the invention can not only be inclined tangentially as seen previously, but they can also be oriented with a non-zero angle around their axis A, so that the general direction B of their foot 85 forms an angle of incidence [3 relative to the axial direction DA (cf. [Fig.9]).

[0084] In the case where the fins are twisted, the angle of incidence of the chord of a fin 8 is not constant over its height. Due to the camber or curvature effect, the angle of incidence of the leading edge 82 and that of the trailing edge 81 differ, so the angle of incidence [3 then designates the average angle of incidence of the fin.

[0085] Furthermore, this angle of incidence [3 progresses preferentially downstream, from 0° to 35°, preferentially from 0° to 20°, so that within the same line L, a fin 8 has an angle of incidence [3 less than or equal to that of the fins 8 downstream of it and greater than or equal to that of the fins 8 upstream of it (cf. [Fig. 10]).

[0086] According to a preferred embodiment of the invention, at least one line L of fins 8 comprises fins 8b 82, ... 8n whose body is oriented according to an angle of incidence [3 i, [32, ... [3n relative to their axial direction DA such that 0° < l[3il < l[32l < ... < l[3nl < 35°, more preferably such that 0° < l[3il < l[32l < ... < l[3nl < 20°. When this angle of incidence [3 increases from one fin to the next within a line L, this makes it possible to progressively impose a helical displacement on the air, while when this angle of incidence [3 remains constant from one fin to the next, this makes it possible to maintain this helical displacement

[0087] According to a preferred embodiment, within the same line L of fin 8, the angle of incidence of the trailing edge 81 of an upstream fin 8n is substantially equal to the angle of incidence of the leading edge 82 of the following downstream fin 8n+i.

[0088] According to a preferred embodiment of the invention, fins 8 may have reliefs and / or hollows on at least one of their flanks 88, for example in the form ripples, shark skin scales, circular hollows distributed evenly over the surface like the outer face of a golf ball, etc.

[0089] According to a preferred embodiment of the invention, at least one fin 8 and the internal part 10 are produced by additive manufacturing. This additive manufacturing is preferably carried out from downstream to upstream, in particular so as to be able to obtain fins 8 whose leading edge 82 is rectilinear. In order to allow this manufacturing, the trailing edge 81 of the fins 8 produced by additive manufacturing preferably has at least one notch 86 of substantially triangular shape.

[0090] According to one embodiment of the invention, fins 8 may have a cambered profile (see [Fig. 17]). The curvature or camber, over a given height of fin 8, designates the angular difference between the angle of incidence at the leading edge 82 and the angle of incidence at the trailing edge 81.

[0091] Fins 8 may also have a greater thickness in the middle to generate the least possible pressure loss, where the intrados and the extrados are curved with different curvatures (see [Fig. 17]). In addition, fins 8 may have a twist, where the angle of incidence of a fin 8 may not be constant over its height. Finally, fins 8 may have a trailing edge and / or a leading edge that is rounded or angular, with a preferably acute angle. These characteristics, optimized together, each make it possible to promote the helical movement of the air flow through the fins 8.

[0092] Fins 8 may also have a greater thickness at their foot 85, which drains more calories.

[0093] According to one embodiment of the invention, the cylindrical portion 9 comprises an upstream part 9a and a downstream part 9b which have a different cross-sectional shape, for example an upstream part 9a of circular cross-section and a downstream part 9b of polygonal cross-section (see [Fig.4]), which generates a change of direction for the flow of air passing from the upstream part 9a to the downstream part 9b. In order to correct this change of direction, a fin 15 may be provided in the flow volumes 13 or flow sub-volumes 13A, 13B (see [Fig. 13]). This fin 15 is preferably provided at the start of the downstream part 9b, that is to say in an upstream zone of the downstream part 9b. It is preferably carried by two successive fins 8 circumferentially, for example at the level of their free end 87. Each fin is inclined so that its downstream edge is inclined towards the internal part 10.

[0094] According to a preferred embodiment of the invention, the external part 11 also comprises cooling fins, designated as additional fins 80 (see [Fig. 14]). Thus, the heat sink 6 comprises a plurality of additional cooling fins 80 which project towards the internal part 10 from the internal face 111 of the external part 11.

[0095] The additional fins 80 may have the same characteristics as those of the fins 8, except that they are preferably provided in axial symmetry with respect to the helical center of rotation of the air flow or with respect to the center of the air flow vein. They will therefore not be described in an additional manner.

[0096] It will nevertheless be noted that in one embodiment of the invention, the additional fins 80 can be obtained by folding and cutting a sheet metal. The additional fins 80 are preferably fixed by welding against the internal face 111 of the external part 11, itself preferably a tubular sheet metal. The additional fins 80 can also be produced in one piece with the heat sink 6 by additive manufacturing (see [Fig. 14]).

[0097] The invention also relates to an intelligent engine 1 equipped with a casing 5 according to the invention, as well as an aircraft equipped with such an intelligent engine 1.

[0098] Although described through a certain number of examples, variants and embodiments, the housing according to the invention includes various variants, modifications and improvements which will be obvious to those skilled in the art, it being understood that these variants, modifications and improvements are part of the scope of the invention.

Claims

Claims

1. Housing (5) of an intelligent motor (1), i.e. of an electric motor comprising an electronic control unit, said housing (5) comprising a hollow cylindrical portion (9) defining an axial direction (DA), a radial direction (DR) and a tangential direction (DT), said cylindrical portion (9) comprising: - a cylindrical internal part (10), - a heat sink (6) located on the internal part (10) and thermally connected thereto, and comprising a plurality of fins (8) comprising a body which rises from the external face (102) of the internal part (10) and extends projecting outwards, these fins (8) being distributed in a plurality of lines (L) parallel to their axial direction (DA),and characterized in that: - the heat sink (6) further comprises: • a plurality of separating walls (12) each extending in a plane (P) defined by their radial direction (DR) and their axial direction (DA); • a plurality of flow volumes (13) each delimited by the internal part (10) and two successive separating walls (12); • at least one line (L) of fins (8) located in at least one flow volume (13), the body of which is oriented according to an angle of incidence [3 relative to their axial direction (DA), said angle of incidence [3 being non-zero for at least one fin (8) of said line (L).,

2. Housing (5) according to claim 1, characterized in that the heat sink (6) comprises at least one line (L) of fins (8) located in at least one flow volume (13) and comprising n fins (8i, 82, ... 8n) with n > 2, the body of which is oriented at an angle of incidence [3i, [32, ... [3n relative to their axial direction (DA) such that 0° < l[3il < l[32l < ... < l[3nl < 35°, more preferably such that 0° < l[3il < l[32l < ... < l|3nl < 20°.

3. Housing (5) according to claim 1 or 2, characterized in that the dis- thermal sipator (6) further comprises at least one line (L) of fins (8) located in at least one flow volume (13) and the body of which is inclined in their tangential direction (DT) by a non-zero angle of inclination α relative to their radial direction (DR).

4. Housing (5) according to claim 3, characterized in that the angle of inclination a is such that 5° < lal < 60°, more preferably such that 10° < lal < 45°.

5. Housing (5) according to any one of the preceding claims, characterized in that the heat sink (6) comprises, in at least one flow volume (13), at least two lines (L) of fins (8), of which at least one line (L) of fins (8) has a positive inclination angle α and at least one line (L) of fins (8) has a negative inclination angle α.

6. Casing (5) according to any one of the preceding claims, characterized in that the heat sink (6) comprises, in at least one flow volume (13), at least one transverse row (R) of fins (8) comprising m successive fins with m > 2 whose body is inclined in their tangential direction (DT) by an angle of inclination ab a2, ... am such that laj < la2l < ... < lamL

7. Housing (5) according to any one of the preceding claims, characterized in that the heat sink (6) further comprises at least one additional separating wall (14) which extends in a plane (PS) defined by its radial direction (DR) and its axial direction (DA) and which compartmentalizes a flow volume (13) into two flow sub-volumes (13A, 13B).

8. Housing (5) according to any one of the preceding claims, characterized in that at least one separating wall (12) or an additional separating wall (14) is connected to the external face (102) of the internal part (10) by a filleted connection (121, 141).

9. Casing (5) according to any one of the preceding claims, characterized in that at least one fin (8) has at least one characteristic among the following characteristics: - it has reliefs and / or hollows on at least one flank (88); - it has a cambered profile; - it has a curved intrados and extrados with different curvatures; - it has a twist, the angle of incidence of the fin (8) not being constant over its height; - it has a rounded trailing edge (81); - it has an angular trailing edge (81); - it has a rounded leading edge (82); and - it has an angular leading edge (82).

10. Housing (5) according to the preceding claim, characterized in that at least one fin (8) and the internal part (10) are part of a single part made of thermally conductive material which is the product of additive manufacturing.

11. Casing (5) according to any one of the preceding claims, characterized in that the cylindrical portion (9) comprises an upstream part (9a) and a downstream part (9b) which have a different section shape, and in that at least two circumferentially successive fins (8) located in an upstream zone of the downstream part (9b) are connected to each other by a fin (15) of which a downstream edge is inclined towards the internal part (10).

12. Housing (5) according to any one of the preceding claims, characterized in that: - the cylindrical portion (9) further comprises a cylindrical external part (11) concentric with the internal part (10), the heat sink (6) being located between the internal part (10) and the external part (11), and in that - the heat sink (6) comprises a plurality of additional cooling fins (80) which project towards the internal part (10) from an internal face (111) of the external part (11).

13. Intelligent motor (1), characterized in that it is equipped with a casing (5) according to any one of the preceding claims.

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