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

Abstract

The invention relates to a stator assembly for an electric motor, comprising a winding support (12) including a ring (125) from which branches (121) of a first cross-section extend radially. The branches (121) define, in pairs, a respective slot (122), the slots (122) having a respective slot bottom (123), and the ring (125) has a central orifice and defines a theoretical inner circle (Ci) and a theoretical outer circle (Ce) in which the slot bottoms (123) are inscribed. The ring (125) has, between the theoretical inner circle (Ci) and the theoretical outer circle (Ce), a second minimum cross-section greater than or equal to 40% of a first minimum cross-section of the branches (121). The ring (125) has at least one recess (22) opposite a branch (121).The invention also relates to an electric motor and a corresponding motor-fan assembly. Figure for the abstract: Fig. 4.

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 drive 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] 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

[0007] 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 having a plurality of windings, and a winding support centered around an axis and comprising a ring from which a plurality of branches of first section extend radially with respect to the axis of the winding support, a winding being formed around each branch.

[0008] The winding support is such that the arms delimit two by two a respective notch, the notches having a respective notch bottom, and the ring has a central orifice and defines a theoretical inner circle and a theoretical outer circle in which the notch bottoms are inscribed.

[0009] According to the invention, the branches have a first minimum section. The ring defines a second section between the theoretical inner circle and the theoretical outer circle, with a second minimum section greater than or equal to 40% of the first minimum section of the branches, and the ring has at least one recess opposite a branch.

[0010] In particular, the second minimum section may be greater than or equal to half, i.e. 50%, of the first minimum section.

[0011] Thus, the ring is hollowed out opposite one or more arms, beyond the theoretical inner circle, within the ring's material thickness between the theoretical inner and outer circles. In other words, the hollowing removes material between the theoretical inner and outer circles, within which the slot bottoms are located. The hollowing(s) reduce the material and therefore the weight of the stator assembly.

[0012] The stator assembly may further comprise one or more of the following characteristics described below, taken separately or in combination.

[0013] The branches, for example, have an elongated shape.

[0014] The branches may be identical.

[0015] The branches may have the same first minimal section.

[0016] In particular, the branches may have a minimum width, which may be the same for all branches.

[0017] The ring defines, for example, a radial thickness between the theoretical inner circle and the theoretical outer circle, with a minimum radial thickness greater than or equal to 40% of the minimum width of the arms. In particular, the minimum radial thickness may be greater than or equal to half (50%) of the minimum width of the arms.

[0018] The recess can be made opposite the middle of a branch.

[0019] The recess has a radial depth such that the ring has a remaining cross-section between the recess and the bottom of the notch of at least 40%, preferably at least 50%, of the first minimum cross-section of the arms. The recess is thus as deep as possible while maintaining a minimum passage cross-section for magnetic flux.

[0020] The recess has, for example, a rectangular or substantially rectangular shape.

[0021] Alternatively, the recess may have a shape chosen from a square, circular, rounded, triangular, wavy shape.

[0022] The winding support may include at least one positioning element configured to cooperate with a complementary element on a motor support on which the stator assembly is intended to be mounted.

[0023] The positioning element can be chosen from a rib, a tooth, said recess, a notch, an eyelet, an ear, a flat, a plate, an outgrowth, a protuberance.

[0024] The positioning element can have a centering function of the winding support, the sheet metal pack, on the motor support, for example a motor support tower.

[0025] Alternatively or in addition, the positioning element may have an anti-rotation function to prevent the stator assembly from being mounted in an incorrect position.

[0026] The notch bottoms, at the level of the theoretical outer circle of the ring, can be of a generally rounded shape towards the inside of the ring.

[0027] In the present, "inwards" of an element means an orientation towards the center or substantially towards the center, that is to say, approaching the center of that element, for example of the ring.

[0028] The ring may have, at the level of the theoretical inner circle, surfaces rounded inwards (in other words towards the center or substantially towards the center, that is to say approaching the center) of the ring, the rounded surfaces being opposite the bottoms of the notch.

[0029] 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.

[0030] A tooth or a foot extends for example on either side of a corresponding branch, following the circumference of the winding support.

[0031] 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.

[0032] The winding support comprises, for example, a bundle of sheets superimposed axially on each other.

[0033] The winding support may include at least one assembly member configured to cooperate with at least one fastening element, the assembly member being selected from a closed eyelet, an open eyelet, a recess, or a clamp shape. The assembly members, in cooperation with the fastening elements, allow the winding support, in particular the lamination pack, to be fixed to the motor support.

[0034] According to a particular example, the ring has an alternation of recesses and assembly members at the level of the theoretical inner circle.

[0035] 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.

[0036] This refers in particular to a brushless motor.

[0037] 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.

[0038] In the motor-fan group or ventilation device, the fan is in particular of the blower type.

[0039] The motor support includes, for example, a tower or shaft designed to coincide with the axis of the winding support, the winding support being mounted on the tower. The tower may optionally have at least one external rib configured to cooperate with said recess in the ring of the winding support.

[0040] 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

[0041] 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:

[0042] [Fig-1] is a perspective view of an embodiment of a motor- fan.

[0043] [Fig.2] is a cross-sectional view of the motor-fan assembly of [Fig.1].

[0044] [Fig.3] is a perspective view of an electric motor of the motor-fan assembly of the [Fig.l].

[0045] [Fig.4] is a perspective view of a winding support for the electric motor of the [Fig.3] according to one embodiment.

[0046] [Fig.5] is a perspective view of a winding support for the electric motor of [Fig.3] according to another embodiment.

[0047] In these figures, identical elements bear the same reference numbers.

[0048] 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 of different embodiments can also be combined or interchanged to provide other embodiments, without departing from the scope of the invention as defined by the claims. Detailed description

[0049] 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 for a vehicle, particularly a motor vehicle.

[0050] 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.

[0051] 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.

[0052] The motor support 7 is intended to allow the fixing of the motor-fan assembly 1 in the vehicle, in particular a motor vehicle.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In addition, the motor support 7 may include a bearing carrier 13 comprising a tower or chimney extending axially. The tower may be tubular in shape around the axis A.

[0058] Engine

[0059] 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").

[0060] 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 can be internal, that is to say, located inside the rotor 5A.

[0061] The stator assembly 5B can be fixed to the motor support 7.

[0062] 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.

[0063] The winding support 12 can be mounted around the tower of the bearing carrier 13.

[0064] The winding support 12 comprises at least one sheet metal 16, and preferably can comprising a stack of 16 plates axially superimposed on one another. The plates 16 may be identical to each other. According to one embodiment, each of the plates 16 fits within a disc, each of the plates 16 having a central hole, so that the stack of plates 16 is axially perforated to receive by insertion a cylindrical part, such as the bearing support tower 13.

[0065] 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.

[0066] 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.

[0067] The branches 121 can be identical.

[0068] The branches 121 may have the same dimensions. In particular, the branches 121 may have a cross-section whose minimum cross-section is the same for several, or even all, of the branches 121.

[0069] Each branch 121 has an elongated shape of width LL. The branches 121 may have a minimum width L1 which may be the same for several or even all of the branches 121.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The notches 122 delimited between two arms 121 of the winding support 12 are axially through.

[0074] 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.

[0075] In addition, each notch 122 has a notch bottom 123. According to one embodiment, the notch bottoms 123 can be generally rounded towards the inside of the winding support 12.

[0076] “Inwards” corresponds to an orientation towards the center or substantially from the center, that is to say approaching the center, of the winding support 12.

[0077] In particular, the slot bottoms 123 can be of a generally concave shape, with the concavity oriented towards the inside of the winding support 12. This rounded shape towards the inside, in particular concave, of the slot bottoms 123 makes it possible to remove material to reduce the overall weight, wherever the cross-section for the passage of the magnetic flux is superfluous.

[0078] 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.

[0079] 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.

[0080] The teeth or feet at the free ends of the branches 121 are therefore opposite the ring 125.

[0081] The ring 125 has a central orifice. The central orifice can be configured to be traversed by the corresponding rotor shaft 51.

[0082] 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.

[0083] The theoretical inner circle Ci has a smaller diameter than the theoretical outer circle Ce.

[0084] The theoretical inner circle Ci is, for example, the smallest circle circumscribed by the surfaces of the ring 125 opposite the notch bottoms 123.

[0085] In other words, it is the inner circle defined without taking into account any elements opposite the branches 121, projecting inwards (i.e. towards the center or substantially the center) 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, 20' projecting inwards of the ring 125 and / or one or more recesses 22 cut into the ring 125 opposite the branches 121 or on the contrary one or more protrusions 22' projecting outwards from the theoretical inner circle Ci of the ring 125.

[0086] The notch bottoms 123 fit within the theoretical outer circle Ce of the ring 125.

[0087] 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 (50%), 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.

[0088] 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.

[0089] The winding support 12, for example, has a constant height. The height extends axially.

[0090] 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.

[0091] In particular, the radial thickness L2 of the ring 125 may have a minimum which is greater than or equal to 40%, preferably half (50%), of the minimum width L1 of a branch 121.

[0092] The ring 125 may, in particular, have surfaces rounded inwards at the level of the theoretical inner circle Ci (i.e., towards the center or substantially the center, that is, approaching the center of the ring 125). 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 may remain substantially circular.

[0093] The ring 125 further has 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.

[0094] This recess 22 is made in the radial thickness of the ring 125.

[0095] 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 cuts out the material between the theoretical inner circle, or substantially circular shape, Ci and the theoretical outer circle, or substantially circular shape, Ce.

[0096] 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.

[0097] 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.

[0098] Each recess 22 hollows out the ring 125 with a radial depth p22, that is to say in the radial thickness L2 of the ring 125.

[0099] This radial depth p22 can be such that the ring 125 has a remaining section R between a recess 22 and a notch bottom 123 which is at least 40%, preferably at least half (i.e. at least 50%), of the first minimum section of the arms 121. The recess 22 is thus made as deep as possible in the thickness of the ring 125, while maintaining a minimum passage section sufficient for a magnetic flux.

[0100] The recess 22 is, for example, made in a rectangular or substantially rectangular shape. Alternatively, the shape may be square or substantially square, or even circular, rounded, triangular, or wavy.

[0101] This recess 22 may be devoid of mechanical function.

[0102] Alternatively, the recess 22 may have a positioning function, for example centering or anti-rotation.

[0103] For example, one or more ribs may be formed on an external wall of the tower. These may be axial ribs. These ribs advantageously have a shape complementary to that of the recesses 22. The notches or recesses 22 cut into the ring 125 of the sheets 16 may, during the mounting of the winding support 12 around the tower, cooperate with such ribs on the external wall of the tower, so as to contribute to the correct positioning of the winding support 12.

[0104] 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 contribute to the correct positioning of the winding support 12. This element of positioning can be chosen from a rib, a tooth, an eyelet, an ear, a flat, a flat, a 22' outgrowth, a protuberance.

[0105] 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 of the motor support 7.

[0106] 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.

[0107] Furthermore, 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.

[0108] 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], in particular 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.

[0109] 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.

[0110] In this particular case, the winding support 12, in particular the lamination pack 16, can be fixed to the motor support 7.

[0111] For this purpose, the winding support 12, in particular the sheets 16, include at least one assembly member 20, 20' (an example of which is shown in [Fig.4] or [Fig.5]) intended to cooperate with at least one fastening element, such as a screw for example.

[0112] The assembly member 20, 20' extends inward (toward the center or substantially the center) of the ring 125, and thus inward toward the winding support 12. More precisely, the assembly member 20, 20' extends radially from the theoretical inner circle Ci toward the inside of the ring 125. The assembly member 20, 20' is advantageously positioned opposite a branch 121. This assembly member 20, 20' can be selected from a closed eyelet 20' ([Fig. 5]), an open eyelet 20 ([Fig. 4]), a recess, a clamp shape, or any other suitable shape. For example, at least three assembly members 20, 20' such as closed or open eyelets 20' can be provided. They are advantageously distributed at 120° to each other.

[0113] According to a particular example, the recesses 22 and the assembly members 20 follow one another alternately at the level of the theoretical inner circle Ci of the ring 125.

[0114] The assembly members 20, 20' for fixing, for example, by screws, may also offer an anti-rotation function. In the case of three assembly members 20, 20', such as three eyelets 20, 20', only three angular positions are acceptable for mounting the winding support 12 on the motor support 7.

[0115] According to one embodiment, the insulator 18 on the side of the motor support 7 can be integrated into the motor support 7, i.e., formed as a single piece with it. According to this embodiment, fasteners such as screws are not required; the windings allow the insulator on the opposite side, as well as the insulator integrated into the motor support, to be held in place on the lamination pack 16.

[0116] Figure 5 shows an alternative example of a winding support 12 of the stator assembly 5B. Only the differences from the previously described examples are detailed below.

[0117] According to this alternative, the winding support 12 comprises a stack of different sheets 16 or plates, in particular having at least two different types I, II of plates or sheets 16.

[0118] At least one type I of plates or sheets 16 can correspond to the embodiment previously described with reference to [Fig.4].

[0119] This first type I of plates or sheets 16 can for example be arranged in a lower part of the winding support 12 according to the orientation of the elements on the [Fig.5],

[0120] As an alternative or in addition, the winding support 12 may include a second type II of plates or sheets 16 different from those of the first type I.

[0121] The second type II of plates or sheets 16 can for example be arranged in an upper part of the winding support 12 according to the orientation of the elements on the [Fig.5],

[0122] The plates or sheets 16 of this second type II may each have: - one or more outgrowths 22', - one or more 20' eyelets which can be closed (as opposed to the open 20' eyelets of the 16' sheets of first type I).

[0123] The protrusions 22' and the assembly elements such as closed eyelets 20' can succeed one another alternately at the level of the theoretical inner circle Ci of the ring 125.

[0124] The projections 22' advantageously serve a centering function. These projections 22' extend radially outward from the ring 125, particularly from the theoretical inner circle Ci, in the direction of the center or approximately from the center of ring 125, or more generally from the winding support 12.

[0125] These protrusions 22' may have a rounded, or concave, shape towards the inside of the ring 125, or of the winding support 12.

[0126] The protrusions 22' can be dimensioned so that when the stator assembly 5B is assembled with the bearing carrier 13 (visible in [Fig.2]) there is a gap between the end of the protrusions 22' and the bearing carrier 13, in particular the tower, for centering with respect to the bearing carrier 13.

[0127] The 20' eyelets can serve to receive a fastening means such as a screw as previously described. In addition, the 20' eyelets can provide a rotational locking function.

[0128] These eyelets 20' can also form outgrowths for example rounded towards the inside / center of the ring 125 and forming a projection, radially, in relation to the ring 125, in particular in relation to the theoretical inner circle Ci of the ring 125.

[0129] In particular, the eyelets 20' may project more radially towards the inside / center of the ring 125 than the outgrowths 22'.

[0130] These eyelets 20' are advantageously dimensioned so as to come into contact with the bearing carrier 13, in particular the tower, and to prevent the stator assembly 5B from rotating relative to the bearing carrier 13. Additionally, the bearing carrier 13, more precisely the tower of the bearing carrier 13, may have respective recesses having a complementary shape to the eyelets 20'. Thus, through contact / cooperation of the eyelets 20' with such recesses, the stator assembly 5B is prevented from rotating relative to the bearing carrier 13.

[0131] Thus, the recess or recesses 22 or notches, made in the radial thickness of the ring 125, make it possible to reduce the material of the ring 125 and thus the weight of the winding support 12, and therefore of the stator assembly 5B, without affecting the magnetic flux which passes through the winding support 12.

[0132] In addition, the recesses 22 may or may not also have a positioning function, for example anti-rotation.

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 (14) having a plurality of windings (141), and - a winding support (12) centered about an axis (A) and comprising a ring (125) from which a plurality of branches (121) of first section extend radially with respect to the axis (A) of the winding support (12), a winding (141) being formed around each branch (121), the winding support (12) being such that: • the branches (121) delimit in pairs a respective slot (122), the slots (122) having a bottom respective notch (123),and • the ring (125) has a central orifice and defines a theoretical inner circle (Ci) and a theoretical outer circle (Ce) in which the notch bottoms (123) are inscribed, - characterized in that the arms (121) have a first minimum section, and the ring (125) defines a second section between the theoretical inner circle (Ci) and the theoretical outer circle (Ce), with a second minimum section greater than or equal to 40% of the first minimum section of the arms (121), and - in that the ring (125) has at least one recess (22) opposite an arm (121).

2. Stator assembly (5B) according to the preceding claim, wherein the recess (22) is provided opposite the middle of a branch (121).

3. Stator assembly (5B) according to any one of the preceding claims, wherein the recess (22) has a radial depth (p22), such that the ring has (125) a remaining section (R) between a recess (22) and a notch bottom (123) of at least 40% of the first minimum section of the arms (121).

4. Stator assembly (5B) according to any one of the preceding claims, wherein the recess (22) has a shape selected from a rectangular, square, circular, rounded, triangular, wavy shape.

5. Stator assembly (5B) according to any one of the preceding claims, wherein the winding support (12) comprises at least one positioning element configured to cooperate with a complementary element on a motor support on which the stator assembly is intended to be mounted, the positioning element being selected from a rib, a tooth, said recess (22), a notch, an eyelet, an ear, a flat, a plate, an outgrowth (22'), a protrusion.

6. Stator assembly (5B) according to any one of the preceding claims, wherein: - the slot bottoms (123), at the level of the theoretical outer circle (Ce) of the ring (125), are generally rounded towards the inside of the ring, and / or - the ring (125) has at the level of the theoretical inner circle (Ci) surfaces rounded towards the inside of the ring (125), the rounded surfaces being opposite the slot bottoms (123).

7. Stator assembly (5B) according to any one of the preceding claims, wherein the winding support (12) comprises a bundle of laminations (16) axially superimposed on one another.

8. Stator assembly (5B) according to any one of the preceding claims, wherein the winding support (12) comprises at least one assembly member (20, 20') configured to cooperate with at least one fastening element, the assembly member (20, 20') being selected from a closed eyelet, an open eyelet, a recess, a clamp shape.

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

10. Fan motor assembly (1), in particular of a heating, ventilation and / or air conditioning system of a motor vehicle, the fan motor assembly (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).

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