Motor support and motor fan unit for heating, ventilation and / or air conditioning system of corresponding vehicle, in particular motor vehicle

Abstract

The invention relates to a motor support (7) for a motor driving a fan wheel, in particular for a motor of a motorized fan unit of a heating, ventilation and / or air conditioning system of a motor vehicle, having a base (70) comprising an internal structure (71) and defining around the internal structure (71) a cooling channel (73) in which an air flow (F) is intended to circulate, the cooling channel (73) has at least one air inlet (74) and at least one air outlet (75). The inner structure (71) has a protrusion (76) arranged opposite the air inlet (74), the protrusion (76) extending from the inner structure (71) towards the air inlet (74) in order to divert an air flow (F) flowing from the air inlet (74) and in the cooling channel (73). The invention also relates to a motorized fan unit comprising such a motor support (7).

Description

Technical Field

[0001] The invention relates to the field of heating, ventilation and / or air conditioning systems for vehicles, in particular motor vehicles. The invention relates more particularly to a motor mount for a fan impeller, in particular a motorized fan unit. The invention also relates to a motorized fan unit for a heating, ventilation and / or air conditioning system, comprising such a motor mount. Background Art

[0002] Vehicles, in particular motor vehicles, are usually equipped with a heating, ventilation and / or air conditioning system which makes it possible to generate an air flow in the passenger compartment. Such a system also makes it possible to manage the temperature and distribution of the air flow generated in the passenger compartment. Such a heating, ventilation and / or air conditioning system comprises in particular a fan which comprises a fan impeller driven in rotation by a drive motor, in particular an electric motor. The electric motor may in particular be an electronic switching motor controlled by a control module.

[0003] An electronically switched electric motor or brushless DC motor has a rotor and stator assembly, each of which supports electromagnetic elements, the interaction of which causes movement of the rotor relative to the stator and, therefore, movement of the fan impeller.

[0004] The electric motor is mounted in the heating, ventilation and / or air conditioning system by means of a motor mount comprising a base having an internal structure allowing the fastening of the electric motor, more precisely the stator.

[0005] Since the motor and the control module include components that heat up during use, it is necessary to ensure cooling of the motor and / or the control module.

[0006] For this purpose, it is known to use the air flow circulating in the heating, ventilation and / or air conditioning system. For this purpose, a portion of the air flow generated by the motorized fan unit is diverted and directed to the motor support. Therefore, the base of the motor support comprises at least one cooling channel for guiding the diverted air flow. The cooling channel is usually shaped to direct the diverted air flow to the motor or the control module.

[0007] Optimizing the cooling of the motor or control module and improving the ventilation of the motorized fan unit are always the goals. In addition, the design of the cooling channels must not hinder the simple installation of the motorized fan unit. Summary of the invention

[0008] The object of the invention is to propose a motor mount, in particular a motor mount for a motorized fan unit of a heating, ventilation and / or air conditioning system of a motor vehicle, which is simple to manufacture and optimizes the cooling performance. Another object of the invention is to improve the overall ventilation performance.

[0009] To this end, the invention relates to a motor mount for a motor for driving a fan impeller, in particular for a motor of a motorized fan unit of a heating, ventilation and / or air conditioning system of a motor vehicle, the motor mount comprising a base, wherein the base comprises an internal structure configured for fastening the motor and defining a cooling channel around the internal structure, an air flow intended to circulate in the channel for cooling the motor and / or a control module of the motor, the motor and / or the control module intended to be fastened to the motor mount, the cooling channel having at least one air inlet and at least one air outlet.

[0010] According to the invention, the inner structure has a protrusion arranged facing the air inlet, the protrusion extending from the inner structure toward the air inlet so as to divert an air flow intended to come from the air inlet and circulate in the cooling channel.

[0011] This base defines a specific air channel for cooling the functions of the motor and / or the control module, and the protrusion makes it possible to divert the air flow intended to circulate in this channel. The protrusion makes it possible to generate turbulence and increase the speed of the air flow.

[0012] The motor mount may also have one or more of the following features, which may be considered individually or in combination.

[0013] The protrusion may have a volute shape.

[0014] For example, the protrusion has a shape that tapers in the air inlet direction.

[0015] The protrusion may have an end portion which may be arranged to face a middle region or a substantially middle region of the air inlet.

[0016] The protrusion may have two concave surfaces extending on either side of the end. The concavity of these surfaces is oriented, for example, toward the cooling channel. Such concave surfaces make it possible to reduce the speed of the incoming air flow and direct the air flow to the interior of the cooling channel without generating turbulence, thereby facilitating the flow of the air flow.

[0017] The base may at least partially have a shape produced by revolution about an axis. For example, in the assembled state of the motorized fan unit, the axis of the base is intended to coincide with the axis of rotation of the motor.

[0018] The protrusion may extend radially relative to the axis of the base.

[0019] The inner structure may be annular and the protrusion may extend from an outer wall of the annulus.

[0020] The internal structure may be in the center of the motor mount or substantially in the center of the motor mount.

[0021] The air inlet and the air outlet may be diametrically opposed to each other.

[0022] According to another aspect, the cooling channel may have a depth along the axis of the base that decreases between the air inlet and the air outlet. This depth difference makes it possible to generate a Venturi effect and improve the flow characteristics of the air flow.

[0023] For example, the depth of the cooling channel decreases continuously.

[0024] The base may have a bottom wall and a front wall opposite to each other along the axis of the base. The bottom wall and the front wall may define a cooling channel.

[0025] The depth between the bottom wall and the front wall at the air inlet is greater than the depth between the bottom wall and the front wall at the air outlet. Therefore, the bottom wall forms a plane inclined relative to the plane defined by the front wall.

[0026] According to another aspect of the invention, the base comprises at least one rib extending from a side of the base opposite the cooling channel and arranged to at least partially face the air outlet. This allows the air flow to be directed towards the motor and the fan impeller without generating turbulence.

[0027] According to a particular example, the base comprises a material bridge connecting the inner structure to the front wall.A rib may extend from the material bridge, in particular towards the motor, through the middle or substantially the middle of the air outlet, so that the cooling channel opens on both sides of the rib.

[0028] The ribs may have a tapered shape.

[0029] The rib may have two concave surfaces extending on both sides from an end portion which is rounded, for example, and on the side opposite to the bridge of material.

[0030] According to another aspect of the invention, at least one aperture is provided in the bottom wall of the base.

[0031] The base may have at least one assembly element, such as a boss, extending from a bottom wall of the base.

[0032] The at least one aperture may be arranged in a wall of the base, such as a bottom wall.

[0033] At least one aperture may be arranged close to the assembly element.

[0034] For example, at least two orifices are provided on both sides of an assembly element. One or more orifices close to an assembly element make it possible to limit the turbulence that may be generated by these assembly elements.

[0035] The assembly elements and the associated apertures close to these assembly elements may be located on the outer periphery of the cooling channel, ie opposite the inner structure.

[0036] At least one orifice can be provided in a wall of the base, such as a bottom wall, close to the air outlet. The orifice is for example arranged at a distance less than or equal to 20 mm from the air outlet. Such an orifice enables the speed of the air flow to be changed, in particular reduced.

[0037] Furthermore, the motor mount may include a heat sink which is fastened to the base and extends facing the cooling channel.

[0038] The heat sink includes, for example, a receiving portion extending from a first side of the heat sink, mounted in the internal structure of the base and configured to receive a component of the motor; and a slot configured to receive a control module on a second side opposite to the first side.

[0039] The invention further relates to a motorized fan unit for a heating, ventilation and / or air conditioning system of a vehicle, in particular a motor vehicle, comprising a fan impeller, a motor for driving the fan impeller and a motor mount as described above.

[0040] The drive motor is, for example, a brushless motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Further advantages and characteristics of the invention will become more apparent on reading the following description, given by way of illustrative and non-limiting examples, and the accompanying drawings, in which:

[0042] [ Figure 1 ] shows an exemplary embodiment of a motorized fan unit according to the present invention.

[0043] [ Figure 2a ]yes Figure 1 A perspective view of the base of the motor bracket of the motorized fan unit.

[0044] [ Figure 2b ] shows Figure 2a A base on which a heat sink is fixed, the heat sink being intended to carry the control module.

[0045] [ Figure 2c ]yes Figure 2a Another perspective view of the base.

[0046] [ Figure 3 ] is an enlarged view of the protrusion facing the air inlet formed in the base.

[0047] [ Figure 4 ] is a perspective view of the base as viewed from below, showing the ribs at the air outlet formed in the base.

[0048] In the figures, identical elements have the same reference numerals. DETAILED DESCRIPTION

[0049] The following embodiments are examples. Although the description relates to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that a feature applies only to a single embodiment. Individual features of different embodiments may also be combined and / or interchanged to provide other embodiments.

[0050] In the specification, certain elements may be assigned serial numbers, such as first element or second element. In this case, the serial numbers are only for distinguishing and indicating similar but not identical elements. Such serial numbering does not mean that one element takes precedence over another element, and such numbering can be easily interchanged without departing from the scope of the present invention.

[0051] Figure 1 A side view of a motorized fan unit 1 (also called a pulser) is shown, in particular for use in a heating, ventilation and / or air conditioning system (not shown) of a vehicle.

[0052] Typically, such a system for a vehicle, in particular a motor vehicle, comprises at least one ventilation duct or circuit and means for heating and / or for cooling the air in flow. A motorized fan unit 1 is arranged in the system in order to flow the air circulating in the ducts of the system in order to be distributed in the passenger compartment of the vehicle. The motorized fan unit 1 is typically mounted on a housing of the system (not shown in the figures).

[0053] The motorized fan unit 1 (or ventilation device) comprises in particular a fan impeller 3, an electric motor 5 and a bracket 7 for the motor 5, hereinafter referred to as motor bracket 7. The invention relates in particular to the motor bracket 7, which will be described in more detail below.

[0054] The fan impeller 3 is intended to be driven in rotation about an axis of rotation A in order to cause a flow of air. The fan impeller 3 may have a generally cylindrical shape comprising blades or vanes.

[0055] The motor 5 is used to drive the fan impeller 3 to rotate. The motor 5 can be a brushless motor 5 in particular.

[0056] The motor 5 comprises a fixed stator part and a rotor (not shown in the figure), which is movable relative to the stator part and is suitable for driving the fan impeller 3. The rotor is, for example, an external rotor. The rotor can be in the shape of a cup fastened to the motor shaft. The fan impeller 3 can be fastened directly to the motor shaft. The motor 5 and the fan impeller 3 are, for example, coaxial.

[0057] The rotor and stator parts may carry electromagnetic elements, the interaction of which results in a movement of the rotor relative to the stator part and of the fan impeller 3. In particular, the rotor may comprise magnets, for example fastened to the inner face of the cup. The stator part may be internal, i.e. positioned inside the rotor. The stator part comprises a stator and, for example, a stator winding. The magnets of the rotor may be positioned radially outside the stator winding. The term "radial" is used relative to the axis of rotation A.

[0058] Furthermore, the motor 5 is intended to be controlled by a control module 13. The control module 13 generally comprises an electronic board (not visible in the figure) having a control circuit, such as a printed circuit, and carrying a set of electronic components allowing the motor 5 to be controlled. The control module 13 may comprise a predetermined number of terminals (not shown) configured to be connected to the motor 5, for example to supply power to the stator windings. The control module 13 may also comprise at least one connector electrically connected to the electronic board, in particular for control signals of the control circuits, and / or for supplying energy for the electrical supply of the motor 5 when connected to, for example, a wiring harness of the vehicle. Thus, the stator windings may generate a magnetic field, which drives the rotor in rotation and therefore the fan impeller 3.

[0059] The motor support 7 can carry a control module 13 of the motor 5. In particular, the control module 13 can be carried by a support, which for example forms a heat sink 15 and is fastened to the motor support 7. The heat sink 15 is advantageously made of aluminum. For example, the heat sink 15 can have a recess defining a slot for accommodating the control module 13. The recess can be surrounded by a protruding rim. Finally, a cover 17 can be fastened to the motor support 7, in particular to the heat sink 15, so as to cover the control module 13. Figure 1 As shown, the control module 13 is hidden by the cover 17. It can be fastened by any suitable means, such as but not limited to by threaded connection. Therefore, the cover 17 and the recess in the radiator 15 together define a housing for receiving the control module 13.

[0060] The motor bracket 7 is intended to allow the motorized fan unit 1 to be fastened to a structure in the vehicle, such as a housing of the system.

[0061] The motor bracket 7 includes a base 70. Figures 2a to 2c The base 70 can at least partially have a shape which is produced by revolution about an axis which, for example, coincides with the axis of rotation A of the fan impeller in the assembled state of the motorized fan unit. The base 70 can be centered about this axis A. The term "axis A" hereinafter denotes the axis of the base 70 and the axis of rotation of the fan impeller / motor.

[0062] The base 70 may extend primarily along a plane perpendicular to the axis A.

[0063] In addition, the base 70 can have a first face or upper face (at Figure 2a The first surface can be used to carry the control module, and the second surface can be used to be arranged on the fan impeller side.

[0064] The base 70 includes, for example, an inner structure 71 configured for fastening the motor 5. For example, the inner structure 71 is annular.

[0065] The inner structure 71 may be in the centre of the motor mount 7 or substantially in the centre of the base 70 or in the centre of the base 70. In the example shown, the inner structure 71 defines a central aperture 72.

[0066] The base 70 may notably comprise two rings, an inner ring 7A and an outer ring 7B.

[0067] At least one decoupling material portion, for example in the form of a decoupling ring 9, may be placed between the inner ring 7A and the outer ring 7B. This may be an elastomeric material connecting the rings 7A, 7B together. The elastomeric material is, for example, polystyrene-b-poly(ethylene-butylene)-b-polystyrene or SEBS. Alternatively, it may be silicone. The decoupling material makes it possible to limit the transmission of vibrations generated by the motor and / or the fan impeller into the vehicle and / or to limit the transmission of external stresses to the motor and / or the fan impeller.

[0068] The inner structure 71 is, for example, the central structure of the inner ring 7A.

[0069] The two rings 7A, 7B may be coaxial. The outer ring 7B has a side wall, for example cylindrical. The inner ring 7A has a side wall, for example cylindrical, connecting a bottom wall 7C and a front wall 7D, which are opposite to each other along the axis A. The front wall 7D defines an annular rim of the inner ring 7A, for example along the axis A of the base 70 on the side opposite to the bottom wall 7C.

[0070] The inner ring 7A can be fastened to the motor, in particular to the stator. The heat sink 15 can be fastened to at least one of the rings, for example the inner ring 7A. In particular, the heat sink 15 can be arranged facing the bottom wall 7C of the inner ring 7A, supported on the front wall 7D. The heat sink 15 can define a housing 16 mounted in the internal structure 71 of the base 70. The housing 16 is used to accommodate elements of the motor and extends from a first side of the heat sink 15. The groove for accommodating the control module is arranged on a second side of the heat sink 15, which is opposite to the first side and opposite to the base 70.

[0071] The outer ring 7B can be used to fasten directly or indirectly to a structure in the vehicle, such as a housing of the system. Figure 1In the example shown, the motor bracket 7 comprises a peripheral air deflector 11 to which the outer ring 7B is fastened. The base can be received in a cavity of such a deflector 11. The air deflector 11 can be used for fastening to a structure in the vehicle, such as a housing of the system. The air deflector 11 forms an interface between the motor bracket 7 and the fan impeller 3 when the motor bracket 7 and the fan impeller 3 are assembled. In operation of the motorized fan unit 1, the air deflector 71 makes it possible to deflect at least a portion of the flowing air caused by the fan impeller 5 towards the control module 7 and / or the motor 5.

[0072] Reference again Figure 2a to Figure 2c The base 70 further includes at least one cooling channel 73 . The cooling channel 73 is arranged around the inner structure 71 .

[0073] The cooling channel 73 may be provided in the thickness of the base 70 so as to form a recess in the base 70 , for example in the inner ring 7A.

[0074] An air flow F for cooling the motor and / or the control module circulates in the cooling channel 73. To this end, the cooling channel 73 has at least one air inlet 74 and at least one air outlet 75, between which the air flow F can circulate. The air inlet 74 and the air outlet 75 may be diametrically opposed.

[0075] The air inlet 74 may take the form of at least one opening provided in a side wall of the outer ring 7B.

[0076] The air outlet 75 may take the form of at least one opening provided in the base 70, for example in the bottom wall 7C. According to a particular embodiment, the base 70 comprises a material bridge 7', with reference to Figure 2a In an orientation such that the material bridge 7 ′ faces the air outlet 75 and, in particular, is above the air outlet 75 , the material bridge 7 ′ connects the inner structure 71 to the front wall 7D of the inner ring 7A.

[0077] The inner structure 71 may have a protrusion 76 arranged facing the air inlet 74. The protrusion 76 extends from the inner structure 71 in the direction of the air inlet 74. In particular, when the inner structure 71 is annular, the protrusion 76 may extend from the outer wall of the annular shape. In particular, the protrusion 76 extends radially relative to the axis A.

[0078] The protrusion 76 may have two opposing sides so that the air flow F from the air inlet 74 is divided into at least two parts for circulation in the cooling channel 73. Each part of the air flow F may follow a different flow circuit from another part of the air flow F.

[0079] The protrusion 76 may have, for example, a rounded end portion 77, which is arranged facing a middle region or a substantially middle region of the air inlet 74. Thus, the two portions of the air flow F may be of equal or substantially equal proportion.

[0080] The protrusion 76 may have a tapered shape. For example, the protrusion 76 has a shape that tapers in the direction of the air inlet 74. Therefore, the end 77 of the protrusion 76 tapers relative to the rest of the protrusion 76.

[0081] Also refer to Figure 3 The protrusion 76 has, for example, two concave surfaces 78 extending on both sides of an end 77 of the protrusion 76. The concavity of these surfaces 78 is oriented toward the cooling channel 73. In other words, the side surfaces of the protrusion 76 may be curved and rounded.

[0082] Each concave (or recessed) surface 78 may describe an arc of a circle of at least 5°. As a specific and non-limiting example, the concave surfaces 78 may extend a distance of at least 10 mm.

[0083] Such a concave surface 78 makes it possible to reduce the speed of the incoming air flow F and direct the air flow F to the interior of the cooling passage 73 without generating turbulence; this facilitates part of the air flow F to flow on both sides of the protrusion 76 .

[0084] In the example shown, the protrusion 76 generally defines a droplet shape, or a shape similar to a droplet.

[0085] The cooling channel 73 has a depth along the axis A of the base 73 which advantageously decreases between the air inlet 74 and the air outlet 75. For example, the depth of the cooling channel 73 decreases continuously.

[0086] In particular, the base 70 may define a bottom wall and a front wall opposite each other along the axis A of the base 70 , delimiting the cooling channel 73 . These are, for example, the bottom wall 7C and the front wall 7D of the inner ring 7A of the base 70 .

[0087] In this case, the depth or height between the bottom wall 7C and the front wall 7D varies, in particular decreases, between the air inlet 74 and the air outlet 75. The depth h1 at the air inlet 74 is greater than the depth h2 at the air outlet 75. Therefore, the bottom wall 7C forms a plane inclined relative to the plane defined by the front wall 7D. This depth difference produces a Venturi effect, making it possible to improve the flow characteristics of the air flow F.

[0088] Likewise, the base 70 may include at least one rib 79, such as Figure 4 The rib 79 extends from the side of the base 70 opposite to the cooling channel 73. The rib 79 can extend in particular from a material bridge connecting the inner structure to the front wall of the inner ring.

[0089] The rib 79 is arranged to at least partially face the air outlet 75. Therefore, the cooling channel opens at the rib 79. In particular, the rib 79 may pass through the middle of the air outlet 75 or substantially pass through the middle of the air outlet 75 so that the cooling channel opens on both sides of the rib 75.

[0090] The ribs 79 extend, for example, in a main extension direction perpendicular to a plane defined by the bottom wall of the inner ring.

[0091] The rib 79 may have a tapered shape. This shape may in some cases be similar to the shape of the protrusion facing the air inlet described above. For example, the rib 79 may have two concave surfaces 80 extending on both sides from an end that is, for example, rounded, on the side opposite to the material bridge. Such a surface 80 serves as a surface for guiding the flow of the air stream F.

[0092] In the assembled state of the motorized fan unit, the ribs 79 extend in particular towards the motor. Thus, the air flow leaving the cooling channel can be directed towards the motor and the impeller, i.e. relative to the motor. Figures 1 to 4 The center element is directed downwards without creating turbulence.

[0093] Furthermore, in operation, it has been found that the air flow in the cooling passages can experience turbulent regions during flow. Figure 2a , 2b The base 70 may have at least one assembly element 19, such as at least one boss, extending from the bottom wall 7C of the base 70. One or more bosses are provided, for example, for assembling the base 70 with another part of the motor bracket 7, such as the heat sink 15. Such bosses may create at least some turbulent areas for the air flow F.

[0094] At least one orifice 21 , 23 is advantageously provided in a wall of the base 70 , for example in the bottom wall 7C.

[0095] One or more orifices, hereinafter referred to as first orifices 21, are provided to limit turbulence. They are advantageously positioned according to the turbulence zone. Orifice 21 may preferably be placed in the center of the vortex, or at a distance less than or equal to 5 mm from the center of the vortex.

[0096] For example, the at least one first aperture 21 is disposed close to an assembling element 19 , such as a boss.

[0097] In the example shown, at least two first orifices 21 are provided around the assembly element 19. The first two orifices 21 may be arranged symmetrically on both sides of the assembly element 19.

[0098] The assembly element 19 (eg, a boss) and the associated first aperture 21 may be located on the outer periphery of the cooling channel 73 , ie opposite the inner structure 71 .

[0099] Additionally or alternatively, at least one orifice 23 may be arranged in a wall of the base 70, for example in the bottom wall 7C of the base 70, close to the air outlet 75. In order to distinguish this orifice from the above-mentioned first orifice 21, this orifice is referred to hereinafter as a second orifice 23. Such a second orifice 23 may in some cases be provided without the first orifice 21. The second orifice 23 makes it possible to change and in particular reduce the speed of the air flow F.

[0100] In the example shown, at least two second apertures 23 are provided near the air outlet 75. The two second apertures 23 may be symmetrically arranged on both sides of the air outlet 75.

[0101] The one or more second apertures 23 may be placed at a maximum of 20 mm from the air outlet 75. They may be placed on the outer / inner periphery or in the center of the cooling channel 73 to best help direct the air flow F.

[0102] Thus, as mentioned above, the motor mount 7 makes it possible to improve the overall cooling performance, in particular of the control module 13 and / or the motor 5 .

[0103] In fact, the base 70 defines a specific air channel 73 for the cooling function, and the protrusion 76 makes it possible to divert the air flow F intended to circulate in this channel. This protrusion 76 makes it possible to generate turbulence and increase the speed of the air flow F. This can happen in such a way that part of the incoming air flow F hits the outer edge delimiting the cooling channel 73 before returning to the middle towards the inside.

[0104] Furthermore, the inclined bottom of the cooling passage 73 makes it possible to improve the flow characteristics of the air flow F from the air inlet 74 toward the air outlet 75 .

[0105] The one or more first orifices 21 and / or second orifices 23 provided in the bottom of the base 70 make it possible to limit turbulence and / or slow down the air flow F.

[0106] Finally, the side of the rib 79 opposite the cooling channel 73 allows a better guidance of the air flow F towards the motor 5 .

Claims

1. A motor mount (7) for a motor (5) for driving a fan impeller (3), in particular for a motor of a motorized fan unit (1) of a heating, ventilation and / or air conditioning system of a motor vehicle, the motor mount (7) comprising a base (70) having: comprising an internal structure (71) configured to secure the motor (5), and A cooling channel (73) is defined around the inner structure (71), an air flow (F) is used to circulate in the channel to cool the motor (5) and / or the control module (13) of the motor (5), the motor (5) and / or the control module (13) of the motor (5) being used to be fastened to the motor bracket (7), the cooling channel (73) having at least one air inlet (74) and at least one air outlet (75), It is characterized in that The inner structure (71) has a protrusion (76) arranged facing the air inlet (74), and the protrusion (76) extends from the inner structure (71) toward the air inlet (74) so ​​as to split the air flow (F) from the air inlet (74) and flowing in the cooling channel (73).

2. The motor bracket (7) according to claim 1, wherein: The protrusion (76) has a shape that tapers along the direction of the air inlet (74).

3. The motor bracket (7) according to claim 2, wherein: The protrusion (76) has two concave surfaces (78) extending on both sides of an end (77) of the protrusion (76).

4. The motor mount (7) as claimed in any one of the preceding claims, wherein: The base (70) has a shape produced by revolution about an axis (A), and the protrusion (76) extends radially relative to the axis (A).

5. The motor bracket (7) according to claim 4, wherein: The cooling channel (73) has a depth (h1-h2) along the axis (A) of the base (70), the depth decreasing between the air inlet (74) and the air outlet (75).

6. The motor mount (7) as claimed in any one of the preceding claims, wherein: The base (70) comprises at least one rib (79) extending from a side of the base opposite to the cooling channel (73) and arranged at least partially facing the air outlet (75).

7. The motor mount (7) as claimed in any one of the preceding claims, wherein: At least one aperture (21, 23) is provided in a wall (7C) of the base (70).

8. The motor bracket (7) according to claim 7, wherein: At least one orifice (23) is arranged at a distance from the air outlet (75) less than or equal to 20 mm.

9. The motor mount (7) according to any one of the preceding claims, comprising a heat sink (15), the heat sink (15) being fastened to the base (70) and extending facing the cooling channel (73), the heat sink (15) comprising: a receiving portion (16) extending from a first side of the heat sink (15), the receiving portion being mounted in the internal structure (71) of the base (70) and being configured to receive elements of the motor (5), and On a second side opposite to the first side, there is a slot configured to receive the control module (13).

10. A motorised fan unit for a heating, ventilation and / or air conditioning system of a vehicle, in particular a motor vehicle, comprising: Fan impeller, a motor for driving the fan impeller, Characterized in that it comprises a motor bracket (7) as claimed in any one of the preceding claims.

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