Stator assembly, corresponding electric motor, and associated motor-fan unit, particularly for motor vehicles

Abstract

Stator assembly, corresponding electric motor, and associated motor-fan unit, particularly for motor vehicles. The invention relates to a stator assembly (5B) for an electric motor (5) of a motor-fan unit (1), the stator assembly (5B) comprising a winding support (12) centered around an axis (A) and comprising a ring (125) from which a plurality of branches (121) extend radially with respect to the axis (A) of the winding support (12), and a winding (14) comprising a plurality of windings (141), a winding (141) being formed around each branch (121). According to the invention, the ring (125) comprises at least one assembly member (20) opposite a branch (121) and configured to cooperate with a complementary fastening element, the assembly member (20) comprising at least one axial guide surface configured to cooperate with a complementary guide element (131) of the motor support (7).Figure for the summary: Fig. 3.

Description

Title of the invention: Stator assembly, corresponding electric motor, and associated motor-fan unit, particularly for motor vehicles technical field

[0001] The invention relates to a stator assembly for an electric motor. The invention also relates to an electric motor comprising such a stator assembly, as well as to a motor-fan unit or ventilation device comprising such an electric motor, which may be intended for use in vehicles, particularly automobiles. The invention may be applied, for example, to heating, ventilation, and / or air conditioning systems for vehicles, particularly automobiles, comprising such a motor-fan unit. Technical background

[0002] Vehicles, particularly automobiles, are commonly equipped with a system, for example, a heating, ventilation, and / or air conditioning system, which circulates air, particularly within the vehicle's passenger compartment. Such a system also manages the temperature and distribution of the airflow within the passenger compartment. This system includes, among other things, a fan, particularly a blower fan, comprising a fan wheel driven by a motor, particularly an electric one. The electric motor may, in particular, be electronically commutated and controlled by a control module.

[0003] An electronically commutated electric motor, or brushless DC motor (also known by the English name "brushless"), comprises a rotor and a stator assembly, carrying electromagnetic elements whose interaction generates the displacement of the rotor relative to the stator assembly, and thus the displacement of the fan wheel.

[0004] The electric motor is assembled in the installation, for example, of heating, ventilation and / or air conditioning by means of a motor support.

[0005] The stator assembly generally comprises a winding having a plurality of windings and a winding support. The winding support comprises a lamination centered around an axis and includes a plurality of arms extending radially from the axis of the winding support. A winding is wound around each arm of the winding support. The arms define a passage cross-section for a magnetic flux. When electric currents flow through the windings, magnetic fields are produced. The rotor is provided with a plurality of permanent magnets. also producing magnetic fields. The interaction of the magnetic fields produced generates the displacement of the rotor relative to the stator assembly, and consequently the rotation of the fan wheel.

[0006] The motor support generally includes a bearing carrier for receiving bearings mounted around the rotor shaft of the electric motor. This bearing carrier may have a tubular tower around which the winding support is mounted. It is then necessary to ensure correct angular positioning of the winding support, for example, around the motor support tower.

[0007] A constant objective in the automotive industry, in particular, is to reduce weight. Specifically, one aim of the present invention is to provide a stator assembly whose weight is reduced without impacting the cross-sectional area useful for magnetic flux. Another objective of the invention is to optimize the shape of the winding support. Summary of the invention

[0008] To this end, the invention relates to a stator assembly for an electric motor of a motor-fan unit comprising a fan wheel, the electric motor being configured to drive the fan wheel in rotation, the stator assembly comprising a winding support centered around an axis and comprising a ring from which a plurality of branches extend radially with respect to the axis of the winding support, and a winding comprising a plurality of windings, a winding being formed around each branch.

[0009] According to the invention, the ring comprises at least one assembly member extending opposite a branch and configured to cooperate with a complementary fastening element for assembling the stator assembly onto a motor support of the motor-fan unit. The assembly member comprises at least one axial guide surface configured to cooperate with a complementary guide element of the motor support.

[0010] The guide surface ensures axial guidance allowing the stator assembly to be mounted on the motor support in a correct angular position, while also allowing it to be fixed, for example by screwing or riveting.

[0011] The stator assembly may further comprise one or more of the following characteristics described below, taken separately or in combination.

[0012] The axial guide surface can delimit at least one axial guide slot.

[0013] At least one axial guide slot can be configured to cooperate with the complementary guide element of the motor mount. The guide slot thus makes it possible to reduce the material and therefore the weight, while ensuring axial guidance that allows the stator assembly to be mounted on the motor mount in the correct angular position and to be secured.

[0014] The axial guide slot can be made in the radial thickness of the assembly member.

[0015] The axial guide slot is axially through.

[0016] The assembly member has, for example, an axially through-hole for receiving the additional fastener. The axial guide slot can advantageously be formed in line with the fastener hole.

[0017] The ring can be central.

[0018] The ring may have a central orifice. The central orifice may be configured to be traversed by a motor support tower comprising the complementary guide element and a corresponding rotor shaft.

[0019] The ring can define a theoretical inner circle and a theoretical outer circle. The theoretical inner circle has a smaller diameter than the theoretical outer circle.

[0020] For example, at least one assembly member extends radially from the theoretical inner circle towards the inside of the ring.

[0021] The ring may include several assembly members, for example at least three assembly members regularly distributed at 120°.

[0022] The assembly member may have an open shape chosen from among a shape that is at least partly circular, an open ear, a clamp.

[0023] The assembly member may in particular have the shape of an open eyelet.

[0024] The ring may have at least one recess arranged opposite a branch.

[0025] According to a particular example, the ring may have an alternation of at least one recess and at least one assembly member. The recesses and assembly members are located at the theoretical inner circle of the ring.

[0026] The winding support may include at least one insulator arranged at least partially on one face of the lamination pack, in particular a face normal to the axis of the winding support. The at least one insulator may be made from parts separate from the motor support.

[0027] The winding support comprises, for example, a bundle of sheets superimposed axially on each other.

[0028] The winding support may include at the free end of a branch at least one tooth or foot. Each branch may be provided with at least one such tooth.

[0029] A tooth or a foot extends for example on either side of a corresponding branch, following the circumference of the winding support.

[0030] The teeth or feet at the free ends of the winding support arms may be designed to be arranged opposite rotor magnets. The rotor may have a cup shape, and the magnets may, for example, be fixed to an inner face of the cup shape.

[0031] The invention also relates to an electric motor, in particular for a motor-fan unit, said motor comprising a rotor and a stator assembly as defined above.

[0032] This refers in particular to a brushless motor.

[0033] The invention further relates to a motor-fan unit, in particular of a motor vehicle, the motor-fan unit comprising a fan wheel, an electric motor, as defined above, configured to drive the fan wheel in rotation, and a motor support, the stator assembly being mounted on the motor support.

[0034] In the motor-fan group or ventilation device, the fan is in particular of the blower type.

[0035] The motor support includes, for example, a tower with an axis coinciding with the axis of the winding support, the winding support being mounted on the tower so that the tower passes through a central orifice of the ring of the winding support.

[0036] The tower may have at least one external rib extending axially and cooperating with an axial guide slot of an assembly member on the winding support ring.

[0037] The motor-fan unit can be intended for a heating, ventilation and / or air conditioning installation of a vehicle, in particular a motor vehicle. Brief description of the drawings

[0038] Other advantages and features of the invention will become more apparent upon reading the following description, given by way of illustrative and non-limiting example, and the accompanying drawings, among which:

[0039] [Fig-1] is a perspective view of an embodiment of a motor-fan unit.

[0040] [Fig.2] is a cross-sectional view of the motor-fan assembly of [Fig.1].

[0041] [Fig.3] is a perspective view of an electric motor of the motor-fan assembly of the [Fig.l].

[0042] [Fig.4] is a perspective view of a winding support for the electric motor of [Fig.3] according to one embodiment.

[0043] In these figures, identical elements bear the same reference numbers.

[0044] The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features from different embodiments can also be combined or interchanged. to provide other achievements, without departing from the scope of the invention, as defined by the claims. Detailed description

[0045] Figures 1 and 2 illustrate a motor-fan assembly 1, particularly for a vehicle such as a motor vehicle. This may specifically be a motor-fan assembly 1 for a heating, ventilation and / or air conditioning system, particularly for a vehicle.

[0046] The motor-fan assembly 1 (or ventilation device) includes in particular a fan wheel 3, a fan wheel drive motor 5, and a motor support 7 for the motor 5, hereafter referred to as the motor support 7.

[0047] The fan wheel 3, particularly of the blower type, rotates about an axis A of rotation. The motor 5 is intended to drive the fan wheel 3 in rotation about its axis A. In this document, the terms "axial", "coaxial", "axially", "radial" or "radially" are defined with respect to this axis A. The motor 5 is described in more detail below.

[0048] The motor support 7 is intended to allow the fixing of the motor-fan assembly 1 in the vehicle, in particular a motor vehicle.

[0049] The motor support 7 may include a base 71 for attaching the motor 5. The base 71 may be intended to be attached to the motor 5. The base 71 has an opening 72 through which a rotor shaft passes at least partially.

[0050] The base 71 can also be intended to be fixed, directly or indirectly, to a structural element of the vehicle, for example, a vehicle heating, ventilation, and / or air conditioning system. In the illustrated example, the engine mount 7 has a mounting interface 73 to which the base 71 is fixed. This mounting interface 73 can advantageously also have an air deflector function, allowing, when the fan motor assembly 1 is operating, for at least a portion of the air set in motion by the fan wheel 3 to be diverted towards a control module 11 of the motor 5 and / or towards the motor 5. The mounting interface 73 can be intended to be fixed to the vehicle.

[0051] The base 71 may have at least a partial shape of revolution about an axis coinciding, for example, with the axis A of rotation of the fan wheel 3 in the assembled state of the motor-fan unit 1. The base 71 may be centered about this axis A. The axis A hereafter refers to both the axis of the base 71 and the axis of rotation of the fan wheel 3. The base 71 may extend mainly along a plane normal to the axis A. For example, the base 71 may have an annular shape, or a ring shape, or a disc shape.

[0052] The motor support 7 advantageously carries the control module 11 of the motor 5. In particular, the base 71 can carry the control module 11. The control module 11 can include an electronic board (not visible in the figures) and at least one connector electrically connected to the electronic board for supplying power to the electronic board and, consequently, to the motor, when connected to an electrical harness, in particular of the vehicle.

[0053] Furthermore, the motor support 7 may include a bearing carrier 13 comprising a tower 130 or chimney extending axially. The tower 130 may be tubular in shape around the axis A. This tower 130 may have at least one external rib 131 extending axially. The rib 131 is called external because it is formed on the outer wall of the tower 130, that is to say, it is oriented outwards from the tower 130, towards a winding support for the motor 5, described below.

[0054] Engine

[0055] As regards the motor 5, more clearly visible in figures 2 and 3, it is an electric motor 5, in particular a brushless motor 5 (also known by the English name "brushless").

[0056] The motor 5 comprises a rotor 5A and a stator assembly 5B, the rotor 5A being movable relative to the stator assembly 5B and capable of driving the fan wheel 3. The rotor 5A is, for example, an external rotor. The rotor 5A may have a cup shape fixed to a rotor shaft 51. Bearings 9 are mounted around the rotor shaft 51. The fan wheel 3 may be fixed directly to the rotor shaft 51. The rotor 5A may include magnets, for example, fixed to an inner face of the cup. The stator assembly 5B may be internal, that is, located inside the rotor 5A.

[0057] The stator assembly 5B can be fixed to the motor support 7.

[0058] The stator assembly 5B includes a winding support 12 fitted around an axis and an associated winding 14. The axis, i.e. the central axis of the winding support 12, can coincide with the axis A of rotation of the fan wheel 3 or the axis of the base 71. In the following description, axis A also designates the axis of the winding support.

[0059] The winding support 12 can have a constant height. The height extends axially.

[0060] The winding support 12 can be mounted around the tower 130 of the bearing carrier 13.

[0061] The winding support 12 comprises at least one sheet metal 16, and preferably can comprising a stack of sheets 16 axially superimposed one on top of the other. The sheets 16 may be identical to each other. According to one embodiment, each of the sheets 16 fits within a disk, each of the sheets 16 having a central orifice, so that the sheet metal bundle 16 is axially pierced to receive by fitting a cylindrical part, such as the tower 130 of the bearing carrier 13.

[0062] With reference to Figures 3 and 4, the winding support 12 comprises a plurality of branches 121 extending radially with respect to the axis A of the winding support 12. Thus, each of the sheets 16 can have a shape with a plurality of radial branches 121.

[0063] Each arm 121 can carry an associated winding 141. More precisely, a winding 141 is formed around a superposition of corresponding arms 121 of each sheet 16. These are the arms 121 that are aligned with each other along the axis A. The rotor magnets 5A can be arranged radially outside with respect to the windings 141. The term radially is understood with respect to the axis A.

[0064] The branches 121 may be identical.

[0065] The branches 121 may have the same dimensions. In particular, the branches 121 may have a cross-section whose minimum cross-section may be the same for several or even all of the branches 121.

[0066] Each branch 121 can have an elongated shape with a predefined width L1. The branches 121 can have a minimum width L1 which can be the same for several or even all of the branches 121.

[0067] The winding support 12 can be provided with teeth or feet on the side of the free ends of the arms 121. Each tooth or foot extends for example on either side of a corresponding arm 121, according to the circumference of the winding support 12.

[0068] The teeth or feet at the free ends of the arms 121 of the winding support 12 are arranged opposite the magnets of the rotor 5A or a support surface for the magnets of the rotor 5A, for example an inner face of the cup shape of the rotor 5A.

[0069] The arms 121 delimit, in pairs, a respective notch 122. Thus, along the circumference of the winding support 12, the latter presents an alternation of arms 121 and notches 122. The notches 122 can be distributed angularly in a regular manner around the axis A.

[0070] The notches 122 delimited between two arms 121 of the winding support 12 are axially through.

[0071] The arms 121 are preferably parallel-edged, so that the inner faces opposite each other of the notches 122 are inclined relative to each other.

[0072] Furthermore, each notch 122 has a notch bottom 123. According to one embodiment, the notch bottoms 123 may be generally rounded inwards towards the winding support 12. In particular, the notch bottoms 123 may be generally concave, with the concavity oriented inwards towards the winding support 12. This inwardly rounded, in particular concave, shape of the bottoms The 123 notch allows material to be removed to reduce overall weight, wherever the magnetic flux passage cross-section is superfluous.

[0073] Two adjacent branches 121 are connected by a bridge or link 124. Such a bridge or link 124 is therefore opposite a corresponding notch bottom 123.

[0074] The arms 121 can extend radially from a ring 125 of the winding support 12, more precisely from each sheet 16. Preferably, this is a central ring 125 with axis A as its axis. The arms 121 can be regularly distributed angularly around this ring 125. This gives, in particular, a general star shape to the winding support 12, to each sheet 16.

[0075] The teeth or feet at the free ends of the branches 121 are therefore opposite the ring 125.

[0076] The ring 125 has a central orifice. The central orifice can be configured to allow passage through the corresponding rotor shaft 51 and the motor support tower 130. More specifically, the winding support 12 is mounted on the tower 130 such that the tower 130 passes through the central orifice of the ring 125.

[0077] The ring 125 defines a theoretical inner circle Ci and a theoretical outer circle Ce. The theoretical inner circle Ci is schematically drawn by dashed lines on [Fig.4], and the theoretical outer circle Ce is schematically drawn by dashed lines.

[0078] The theoretical inner circle Ci has a smaller diameter than the theoretical outer circle Ce.

[0079] The theoretical inner circle Ci is, for example, the smallest circle circumscribed by the surfaces of the ring 125 opposite the notch bottoms 123.

[0080] In other words, it is the inner circle defined without taking into account any possible elements opposite the branches 121, projecting towards the inside of the ring 125 or on the contrary cutting into the radial thickness of the ring 125, such as one or more assembly members 20 projecting towards the inside of the ring 125 and / or one or more recesses 22 cut into the ring 125 opposite the branches 121.

[0081] The notch bottoms 123 fit within the theoretical outer circle Ce of the ring 125.

[0082] The ring 125 may have, between the theoretical inner circle Ci and the theoretical outer circle Ce, a section whose minimum (minimum section) is greater than or equal to 40%, preferably half, of the minimum section of a branch 121. For reasons of clarity, the section of a branch 121 is called the first section and the section of the ring 125 is called the second section.

[0083] Such a ratio between the first minimum section of the branches 121 and the second minimum section of the ring 125 makes it possible not to disturb the magnetic flux of the stator assembly while ensuring good mechanical strength of the latter.

[0084] The ring 125 defines a radial thickness L2 (or width) with respect to the axis A between the theoretical inner circle Ci and the theoretical outer circle Ce.

[0085] In particular, the radial thickness L2 of the ring 125 may have a minimum which is greater than or equal to 40%, preferably half, of the minimum width L1 of a branch 121.

[0086] The ring 125 may, in particular, have surfaces rounded inwards at the level of the theoretical inner circle Ci. In this case, the rounded surfaces are opposite the notch bottoms 123. The rounded surfaces at the level of the theoretical inner circle Ci are, for example, concave. According to the particular embodiment, the ring 125 is shown rounded inwards, in particular concave, on both the inner and outer sides of the ring 125. According to a variant, on the inner side of the ring 125, the shape could remain substantially circular.

[0087] The winding support 12 may include at least one insulator 18 arranged at least partially on one face of the stack of sheets 16, in particular a face normal to the axis A of the winding support 12. The insulator 18 covers at least partially the branches 121 of the winding support 12. For this purpose, it may have a shape complementary to the shape of a sheet 16.

[0088] According to one example, two insulators 18 can be arranged above and below the lamination stack 16, that is, on either side of the lamination stack 16 along axis A, as illustrated in [Fig. 2], specifically on opposite faces along axis A of the lamination stack 16, so as to protect and insulate the windings of the lamination stack 16. The insulators 18 are made of plastic parts. One insulator 18 can be on the side of the motor support 7 and another insulator 18 can be on the side of the fan wheel 3 in the assembled state of the motor-fan unit 1.

[0089] At least one insulator 18, in particular the one on the side of the motor support 7, can be made from a part separate from the motor support 7.

[0090] In this particular case, the winding support 12, in particular the lamination pack 16, can be fixed to the motor support 7. The fixing can be achieved by screwing or alternatively by riveting.

[0091] For this purpose, the winding support 12, in particular the sheets 16, includes at least one assembly member 20 (an example of which is shown in figures 3 and 4) intended to cooperate with at least one additional fastening element, such as a screw for example, for an assembly of the winding support 12 on the motor support 7.

[0092] The assembly member 20 has, for example, an axially through fixing hole. This fixing hole is intended to receive the additional fixing element such as a screw, for example, or such as a rod, at least one end of which is deformed, for example, by a swaging process.

[0093] When several sheets 16 are stacked, the fixing holes open axially onto each of the axial end sheets 16. The assembly members 20 can each allow the passage of the fixing element.

[0094] The assembly member 20 extends into the ring 125, and therefore into the winding support 12. More precisely, the assembly member 20 extends radially from the theoretical inner circle Ci into the ring 125. The assembly member 20 thus forms a protrusion in the central orifice of the ring 125, exceeding the theoretical inner circle Ci of the latter.

[0095] The assembly member 20 is advantageously positioned opposite a branch 121. For example, at least three assembly members 20 can be provided. They are advantageously distributed at 120° intervals from each other.

[0096] The assembly member 20 has an open shape selected from a shape that is at least partly circular, an open eyelet, an open ear, a clamp shape, or any other suitable open shape.

[0097] The assembly members 20, for example for fixing by screw or riveting, may also offer an anti-rotation function. In the case of three assembly members 20, only three angular positions are acceptable for mounting the winding support 12 on the motor support 7.

[0098] At least one assembly member 20 comprises at least one axial guide surface.

[0099] At least one assembly member 20 comprises, for example, at least one axial guide slot 201 delimited by the axial guide surface.

[0100] The axial guide slot 201 can be formed within the radial thickness of the assembly member 20. In particular, it is formed in line with the mounting hole. In other words, the axial guide slot 201 communicates with, or opens onto, the mounting hole. In this way, the mounting hole is no longer surrounded by material. More precisely, the axial guide slot 201 is formed on an inner side of the assembly member 20 opposite the tower 130.

[0101] The axial guide slot 201 makes it possible to reduce the material and therefore the weight of the winding support 12.

[0102] The guide surface, defining for example such a slot 201, cooperates with a complementary guide element of the motor support 7, particularly when mounting the winding support 12 on the motor support 7. In particular, this axial guide surface, or for example the axial guide slot 201, can cooperate with an external rib 131 on the tower 130 of the bearing carrier 13, or more generally of the motor support 7. The external rib 131 thus forms the complementary guide element. Such a rib 131 can have a longitudinal shape along the axis A, for example with a rectangular cross-section.

[0103] Thus, when mounting the winding support 12 around the tower 130, one or more external ribs 131 of the tower 130 are guided axially against the axial guide surfaces or through the associated axial guide slots 201 of the assembly members 20. This allows the correct angular positioning of the winding support 12 relative to the tower 130.

[0104] The axial guide surface, and for example the axial guide slot 201, can be made in a shape complementary to the shape of the complementary guide element, such as the external rib 131 of the tower 130, for form cooperation. For example, the axial guide slot 201 can follow a rectangular or substantially rectangular contour. Other shapes can be envisaged.

[0105] The assembly members 20 thus allow the sharing of functions for fixing, for example by screws, the winding support 12 to the motor support 7, and for axial guidance and angular positioning during the mounting around the tower 130 of the support 7.

[0106] Furthermore, the ring 125 may also have at least one recess 22 located opposite a branch 121. More precisely, the recess 22 is advantageously located in the middle of a branch 121. This is a magnetically neutral location, so that it does not impact the magnetic flux in operation.

[0107] This recess 22 is for example made in the radial thickness of the ring 125.

[0108] Thus, the ring 125 is hollowed out opposite one or more branches 121, beyond the theoretical inner circle Ci, in the material thickness or radial thickness L2 of the ring 125 between the theoretical inner circle Ci and the theoretical outer circle Ce. In other words, the hollowing 22 cuts out the material between the theoretical inner circle, or substantially circular circle, Ci and the theoretical outer circle, or substantially circular circle, Ce.

[0109] According to the particular example illustrated, several, for example three, recesses 22 are made in the ring 125. The recesses 22 can be regularly distributed around the ring 125. They are advantageously distributed at 120° to each other.

[0110] According to a particular example, the recesses 22 and the assembly members 20 alternate in succession at the level of the theoretical inner circle Ci of the ring 125. A recess 22 can therefore be between two assembly members 20. Similarly, an assembly member 20 can be located between two recesses 22.

[0111] The recesses 22 can in particular be formed on one or more of the sheets 16. These recesses 22 make it possible to reduce the material and therefore the weight of the stator assembly 5B.

[0112] This radial depth can be such that the ring 125 has a remaining cross-section between a recess 22 and a notch bottom 123 that is at least 40%, preferably at least half, of the first minimum cross-section of the arms 121. The recess 22 is for example made in a rectangular or substantially rectangular shape, square or substantially square, or even circular, rounded, triangular, wavy.

[0113] This recess 22 may be devoid of mechanical function.

[0114] Alternatively, the recess 22 may have a positioning function, for example centering or anti-rotation.

[0115] Alternatively or in addition, the winding support 12 may include at least one positioning element or at least one other positioning element configured to cooperate with a complementary element on the motor support 7, so as to participate in the correct positioning of the winding support 12. This positioning element may be selected from a rib, a tooth, an eyelet, an ear, a flat, a flat 23.

[0116] Furthermore, at least one positioning element may have a centering function of the winding support 12, of the sheet metal pack 16, on the motor support 7, for example around the tower 130 of the motor support 7.

[0117] Alternatively or in addition, at least one positioning element may have an anti-rotation function to prevent the stator assembly from being mounted in a position that is not correct.

[0118] According to a particular example, the additional positioning elements carried on the one hand by the winding support 12 and on the other hand by the motor support tower 7 can be formed by ribs, for example axial ribs, and additional notches, recesses, or flat surfaces. For example, one or more additional ribs 132 for positioning can be formed on an external wall of the tower 130. These can be axial ribs 132. The additional elements can be formed on the winding support 12, in particular on one or more of the laminations 16. Of course, the reverse is also possible with one or more positioning ribs formed on the winding support 12.

[0119] Thus, the assembly members 20 therefore combine both the fixing holes, for the passage of fixing elements such as screws, for fixing the winding support 12 to the motor support 7, and axial guide surfaces for the angular positioning of the winding support 12 relative to the motor support 7.

[0120] The axial guide slot(s) 201 are aligned radially with the mounting holes defined by the respective assembly members 20. These axial guide slots 201 also make it possible to reduce the material and thus the weight of the winding support 12, and therefore of the stator assembly 5B, without affecting the magnetic flux passing through the winding support 12.

[0121] In addition, one or more recesses 22 or notches, made in the radial thickness of the ring 125 can further reduce the material and thus the weight of the winding support 12.

Claims

Demands

1. Stator assembly (5B) for an electric motor (5) of a fan-motor unit (1) comprising a fan wheel (3), the electric motor (5) being configured to drive the fan wheel (3) in rotation, the stator assembly (5B) comprising: - a winding support (12) centered about an axis (A) and comprising a ring (125) from which a plurality of arms (121) extend radially with respect to the axis (A) of the winding support (12), and - a winding (14) comprising a plurality of windings (141), a winding (141) being formed around each arm (121), - characterized in that the ring (125) comprises at least one assembly member (20) extending opposite an arm (121) and configured to cooperate with a complementary fastening element for assembly of the stator assembly (5B) on a motor support (7) of the motor-fan unit (1),the assembly member (20) comprising at least one axial guide surface configured to cooperate with a complementary guide element (131) of the motor support (7).

2. Stator assembly (5B) according to the preceding claim, wherein the axial guide surface delimits at least one axial guide slot (201) configured to cooperate with the complementary guide element (131) of the motor support (7).

3. Stator assembly (5B) according to the preceding claim, wherein the axial guide slot (201) is made in the radial thickness of the assembly member (20).

4. Stator assembly (5B) according to any one of the preceding claims, wherein the ring (125) has a central orifice and defines a theoretical inner circle (Ci) and a theoretical outer circle (Ce), such that at least one assembly member (20) extends radially from the theoretical inner circle (Ci) towards the interior of the ring (125).

5. Stator assembly (5B) according to any one of the preceding claims, wherein the ring (125) comprises at least three assembly members (20) regularly distributed at 120°.

6. Stator assembly (5B) according to any one of the preceding claims, wherein the assembly member (20) has an open shape selected from a shape that is at least partly circular, an open ear, a clamp.

7. Stator assembly (5B) according to any one of the preceding claims, wherein the assembly member (20) has the form of an open eyelet.

8. Electric motor (5) in particular for a motor-fan unit (1), said motor (5) comprising a rotor (5A) and a stator assembly (5B) according to any one of the preceding claims.

9. Motor-fan unit (1), in particular of a motor vehicle, the motor-fan unit (1) comprising a fan wheel (3), an electric motor (5) according to the preceding claim configured to drive the fan wheel (3) in rotation, and a motor support (7), the stator assembly (5B) being mounted on the motor support (7).

10. Motor-fan assembly (1) according to the preceding claim, wherein the motor support (7) comprises a tower (130) with axis coinciding with the axis (A) of the winding support (12), the winding support (12) being mounted on the tower (130) such that the tower (130) passes through a central orifice of the ring (125) of the winding support (12), and wherein the tower (130) has at least one external rib (131) extending axially and cooperating with an axial guide slot (201) of an assembly member (20) on the ring (125) of the winding support (12).

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