Stator for rotating electric machine

Abstract

The invention relates to a stator (4) of a rotary electric machine (1), in which at least one recess (22) comprises a receiving region (220) for an electrically conductive element and a neck (221) extending the receiving region (220) towards an inner periphery (20) of a main body (14) of the stator, the receiving region (220) having an abutment surface (222) preventing the electrically conductive element from disengaging in the direction of the inner periphery (20) in an orthogonal radial direction, and the neck (221) extending the receiving region (220) towards the inner periphery (20) of the main body (14) of the stator. The neck (221) has a width measured in an orthogonal direction that is variable over at least a portion of the distance between the abutment surface (222) and the inner periphery (20).

Description

Technical Field

[0001] This invention relates to the field of rotating electric machines, and more particularly to the field of wound stators present in such rotating electric machines. Background Technology

[0002] Typically, a rotary electric motor includes a rotor that can be rotatably moved and fixed to a drive shaft and a fixed stator, the rotor being able to rotate about the stator or inside the stator.

[0003] The stator includes a body and electrical windings. The body of the stator forms a rotating portion comprising a stack of sheets along the axis of rotation of the stator. The body is provided with a plurality of teeth forming two-by-two notches, the notches being sized to receive conductive elements of the electrical windings. The inner radial end of each tooth forms a tooth root, and each tooth root is specifically configured to retain the conductive elements of the electrical windings within their respective notches once in place.

[0004] In an electric motor, the current flowing through the stator windings contributes to the generation of a rotating magnetic field effect that flows through the metal body of the stator, and the rotor, equipped with magnetic elements (such as windings or permanent magnets), can rotate within the stator via electromagnetic drive. Reversibly, the mechanical rotational motion of the rotor equipped with magnetic elements can generate current in the conductive elements of the windings through electromagnetic interaction with the wound stator.

[0005] The electrical windings are organized into phase windings that axially cross the stator in notches and form connections at the axial ends of the stator to create winding continuity from one notch to another. These windings can in particular be multiphase windings connected in a star or delta configuration, with their outputs connected to an inverter, which can be used as a bridge rectifier if desired.

[0006] The electromagnetic performance of a rotating electric machine depends on the correct positioning of the magnetic components relative to each other, as well as the amount of magnetic flux leakage.

[0007] Regarding the first point, the designers of rotating electrical machines must therefore consider the position of the stator's electrical windings relative to the rotor, and specifically seek means to ensure that the radial position of the conductive elements forming the electrical windings is a certain distance from the air gap formed between the stator and the rotor.

[0008] Regarding the second point, the designer of the rotating electric machine must specifically limit the amount of magnetic flux that does not flow according to the theoretical magnetic flux loop, which is transmitted from the rotor to the stator via the air gap at the level of the first tooth, around the notch wound in the stator body, through the body core arranged opposite the notch to the air gap from the first tooth to the adjacent tooth, and back to the rotor via the air gap at the level of the adjacent tooth. Summary of the Invention

[0009] Against this background, the present invention proposes a stator for a rotating electric motor, wherein the notch configuration can ensure the stable positioning of the conductive elements of the electrical winding within the notch, and can also create a magnetic flux leakage barrier that does not restrict the magnetic flux flow performance within the stator.

[0010] Therefore, the main object of the present invention is to provide a stator for a rotary electric motor for a motor vehicle, the stator being intended to surround a rotor of the rotary electric motor, the stator extending along a longitudinally extending axis, the stator including a body and electrical windings, the body having an inner periphery intended to face the rotor, the body including a plurality of teeth defining recesses extending radially within the body of the stator from one longitudinally axial end of the stator body to another longitudinally axial end, the windings including conductive elements located within the recesses.

[0011] The feature is that at least one notch includes a receiving region for a conductive element and a neck extending toward the inner periphery of the stator body, the receiving region having an abutment surface that prevents the conductive element from disengaging in the direction of the inner periphery, the abutment surface being orthogonal radial, and the neck having a width measured in the orthogonal radial direction, the width being variable over at least a portion of the distance between the abutment surface and the inner periphery.

[0012] It should be noted that the variable width of the neck must be understood as a width modification other than that that can be produced by the manufacturing tolerances of the stator. This variable width can also be obtained by the average width of a portion of the neck, which differs from the average width of another portion of the neck, or by the evolving width of a portion of the neck as it approaches the rotor, and, if necessary, by both. More specifically, the width of the neck is variable, wherein it decreases as it approaches the inner periphery of the stator body.

[0013] The stator according to the invention can particularly optimize the flow of magnetic flux within the stator body, thereby improving the performance of the rotating electrical machine. The presence of a variable-width neck allows for the formation of an effective barrier, preventing magnetic flux from escaping from one tooth to another without allowing it to bypass the notch or be transmitted from the stator to the rotor. It also ensures a minimum width at the horizontal level of the stator's inner periphery to optimize the amount of magnetic flux that can be transmitted from the rotor to the stator and vice versa. This variable-width neck can be advantageously combined with the presence of an orthogonal radial abutment surface that defines the area for receiving conductive elements within the notch, ensuring proper positioning of the electrical windings in the stator and preventing movement that could damage the insulator between the conductive elements and the wall defining the notch.

[0014] According to an optional feature of the invention, the width of the neck at the abutment surface in the receiving region is greater than the width of the neck at the inner periphery of the stator. The greater width of the neck at the abutment surface in the receiving region allows for prevention of magnetic flux leakage between teeth. This means that magnetic flux is prevented from directly reaching another tooth without flowing around the slot. The smaller width of the neck at the inner periphery of the stator allows for an increase in the exchange surface between the magnetic flux and the rotor. Therefore, the electromagnetic performance of the stator is improved.

[0015] According to an optional feature of the invention, the width of the neck is variable, wherein it gradually decreases from the abutment surface of the receiving area inwards to the periphery.

[0016] According to an optional feature of the invention, the gradual decrease in the width of the neck is linear.

[0017] According to an optional feature of the invention, the neck has a widened portion with a variable width and an opening leading to the inner periphery.

[0018] In other words, the notch leads to the inner periphery of the stator via a slot, at least a portion of which has a variable width, and the slot forms a neck.

[0019] According to an optional feature of the invention, the opening portion of the neck has a constant width.

[0020] According to an optional feature of the invention, the height of the widened portion in the radial direction is greater than the height of the opening portion in the radial direction. This allows the opening portion to have good saturation, thereby increasing the magnetic flux barrier effect and improving the performance of the motor.

[0021] According to an optional feature of the invention, the neck has a widened portion whose width is variable from the abutment surface of the receiving area to the portion of the stator body between the neck and the inner periphery.

[0022] In other words, the notch does not lead to the inner periphery.

[0023] According to an optional feature of the invention, the widened portion is trapezoidal in a plane orthogonal to the longitudinal extension axis.

[0024] According to an optional feature of the invention, the widened portion is part of a circle in a plane orthogonal to the longitudinally extending axis.

[0025] According to an optional feature of the invention, the width of the neck of the notch at the level of the abutment surface is less than the dimension of the conductive element present in the notch, measured in the same orthogonal radial direction.

[0026] According to an optional feature of the invention, the width of the neck at the level of the abutment surface is approximately 50% to 80% of the value of the dimension of the conductive element measured in the same orthogonal radial direction.

[0027] In other words, the notch leads to the inner periphery of the stator via a slot, at least a portion of which has a variable width.

[0028] The present invention also relates to a rotary electric motor comprising a rotor and a stator as described above, wherein the inner periphery of the stator and the outer periphery of the rotor are arranged to form an air gap therebetween.

[0029] According to an optional feature of the invention, the conductive element consists of sections electrically connected to each other at the longitudinal axial ends of the stator. Attached Figure Description

[0030] Other features, details, and advantages of the invention will become more apparent from the following description and from the exemplary embodiments given by way of indication rather than limitation with reference to the accompanying drawings, which include:

[0031] Figure 1 This is a general perspective view of the rotary electric motor according to the present invention;

[0032] Figure 2 yes Figure 1 A perspective view of the stator of a rotating electric motor, which includes at least one electrical winding;

[0033] Figure 3 yes Figure 2 A top view of the stator, without electrical windings, makes more specific the multiple notches formed in the body of the stator and leading to the inner periphery of the body.

[0034] Figure 4 A first embodiment is shown. Figure 3 The details of the stator, without electrical windings, but this time with a rotor of a rotating motor and an air gap arranged between the rotor and the stator, make the notch form unique to this invention more clearly visible.

[0035] Figure 5 It shows Figure 4 Details of the stator, which has a notch according to the first embodiment, and conductive winding elements and an electrical insulator disposed between these conductive elements and the wall defining the notch;

[0036] Figure 6 It is similar to Figure 5 The view has a notch according to the second embodiment;

[0037] Figure 7 It is similar to Figure 5 The view has a notch according to the third embodiment;

[0038] Figure 8 yes Figure 6 The simplified representation, without electrical insulation and cut lines, indicates the dimensional features unique to this invention;

[0039] Figure 9 yes Figure 6 The simplified representation, without electrical insulation and cut lines, indicates other dimensional features unique to this invention. Detailed Implementation

[0040] Features, variations, and different embodiments of the present invention can be associated with each other in various combinations, provided that they are not incompatible or exclusive with respect to each other. In particular, it is conceivable that variations of the present invention may include only the feature selections described below, isolated from the other described features, if such feature selections are sufficient to provide a technical advantage and / or distinguish the present invention compared to the prior art.

[0041] In the accompanying drawings, elements common to several drawings retain the same reference numerals.

[0042] As a reminder, the present invention relates to a specific arrangement of notches for receiving electrical windings within the stator of a rotating electric machine, which allows for optimization of the electromagnetic performance of the rotating electric machine.

[0043] The invention, which will be described in more detail below, is particularly applicable to rotating electric machines, for example... Figure 1 The rotary motor shown in the exploded diagram can be used, for example, as an electric motor in a vehicle.

[0044] For this purpose, the rotary electric motor 1 includes a rotor / stator assembly inside a housing 2, which is formed by two housings capable of being assembled with each other. More specifically, the rotor / stator assembly with a built-in rotor includes a stator 4 and a rotor 10. The stator 4 is equipped with an electrical winding 6, which can be connected via a connector 8 suitable for an electrical network. The rotor 10 is rotatable within the stator and fixed to a shaft 12 extending along a longitudinally extending axis X. The rotor 10 includes magnetic elements, such as permanent magnets, capable of interacting with a rotating magnetic field generated by the electrical supply from the electrical winding 6.

[0045] Stator 4 (more specifically in) Figure 2 and Figure 3 (As can be seen in the image) includes a body 14, which is formed by a stack of laminations stacked on top of each other along the rotation axis R of the stator, which is parallel to the longitudinal extension axis X of the aforementioned rotary motor. In the specification, the terms radial and axial refer to the rotation axis R and / or the longitudinal extension axis X of the stator 4, and the concepts of inner and outer also refer to these axes, wherein the inner surface of a portion of the rotary motor is closer to the rotation axis than the outer surface of the same portion.

[0046] The main body 14 of the stator 4 includes at least one core 15 extending about the rotation axis R of the stator 4, and a plurality of teeth 16 protruding from the core 15. Figure 3As can be seen, each tooth 16 extends radially toward the axis of rotation of the stator, and the free end of each tooth forming a tooth root 18 facing inwards to the stator participates in defining the inner periphery 20 of the stator body 14. The plurality of teeth 16 also allow for the definition of a plurality of recesses 22 in pairs. More specifically, two adjacent teeth 16 define a recess 22 in the stator body, each recess being used to receive a conductive element 24 of the electrical winding 6 of the stator 4, such as... Figure 2 As shown.

[0047] Notch 22 (more specifically in) Figure 4 and Figure 5 (As can be seen in the image) Each includes two radially extending sidewalls 26 and a bottom wall 28 connecting the two sidewalls 26 at the level of the core 15, that is, the bottom wall 28 connects the outer radial ends of the two sidewalls. Opposite to the bottom wall, on the inner radial end side of the two sidewalls, each notch 22 leads to a neck 221. According to the invention, the neck 221 is characterized in that it leads to or does not lead to the inner periphery 20 of the stator body, and has at least one portion of variable width, as shown in the image. Figures 4 to 9 It is described in more detail in the text.

[0048] Conductive elements 24 axially pass through the stator and are arranged radially aligned within slots. The ends of these conductive elements are connected to the ends of conductive elements axially passing through the stator in another slot to form a continuous winding. These conductive elements are in particular rigid segments, each forming a branch of a U-shaped pin, such that one end of each conductive element is connected to another branch of the pin at the longitudinal axial end of the stator, and the other end is welded to a conductive element of another pin at another longitudinal axial end of the stator 4.

[0049] This configuration of the conductive elements makes it possible to axially insert the conductive elements 24 into the recess 22, which allows for an average width of the neck 221 that is smaller than the corresponding size of the conductive elements 24, so that they can be enclosed in the recess 22.

[0050] This rotary motor 1 is assembled such that the inner periphery 20 of the stator 4 extends a short distance from the outer periphery 11 of the rotor 10, having an air gap 13. The radial dimension of the air gap 13 allows the rotor to rotate within the stator, but allows the formation of a loop around the notch and the propagation of the magnetic field transmitted from the stator to the rotor.

[0051] Figure 4 The notch 22 near the inner perimeter 20 is partially shown, making the bottom wall invisible in this figure. The notch 22 lacks the electrical winding 6 here, allowing different portions of the notch to be more clearly visible.

[0052] The notch 22 includes a receiving region 220 and the aforementioned neck 221. The receiving region 220 is configured to receive a conductive element of an electrical winding and an insulator disposed between the wall of the notch and the conductive element. The neck 221 extends the receiving region 220 toward the inner periphery 20. Figure 4 In the example shown, the neck 221 leads to the inner periphery 20, but as Figure 7 and Figure 8 As shown, the neck 221 can be closed.

[0053] According to the invention, the neck 221 includes at least one portion with a variable width. In other words, at least a portion of the neck has a dimension measured in a direction perpendicular to the radial direction along which the notch 22 extends, and this dimension varies along that radial direction. More specifically, the width is variable because it decreases as it approaches the inner periphery of the stator body.

[0054] exist Figure 4 In the example shown, the neck 221 includes a first portion with a variable width and a second portion with a constant width, the first portion opening to the receiving area and the second portion opening to the inner periphery. The first portion forms a widened portion 223, and the second portion forms an opening portion 224.

[0055] from Figure 4 As can also be seen, a special feature of the stator of the present invention is that, in conjunction with the variable width of the neck, the receiving region 220 has an abutment surface 222 that extends substantially perpendicularly from the sidewall 26 defining the receiving region of the recess 22. This abutment surface extends parallel to the bottom wall of the aforementioned recess and serves to prevent the conductive elements 24 of the electrical winding from disengaging toward the interior of the stator body (in the rotor direction). The abutment surface 222 is radially orthogonal, perpendicular to the radial extension direction of the recess, to form a planar support surface for the conductive elements. (As shown in...) Figures 5 to 7 As can be seen, the abutment surface 222 also forms a support surface for the electrical insulator 25, which is designed to prevent short circuits between the stator body and the conductive elements of the electrical winding. The electrical insulator 25 may, in particular, be in the form of an insulating paper sheet, such as a polyester-based insulating paper sheet, whose shape is substantially complementary to the shape of the area for receiving the notch.

[0056] The neck 221 appears at the center of the abutment surface 222 and its width is smaller than the width of the abutment surface 222, such that two support portions 225 are formed on both sides of the opening formed by the neck 221 in the orthogonal radial abutment surface 222.

[0057] The function of neck 221 is to prevent magnetic flux leakage and ensure that the magnetic flux forms a loop from the stator to the rotor and around the windings in the notch, which is achieved by ensuring that the windings present in the notch cannot slip toward the rotor.

[0058] More specifically, the neck 221 forms a narrowed section of the channel cross-section with a notch in the direction of the inner periphery 20 of the stator, to ensure that the conductive element is well blocked in the notch 22. The orthogonal radial arrangement of the abutment surface 222 ensures a surface perpendicular to the disengagement direction of the conductive element toward the interior of the stator, and this in particular makes it possible to prevent the internal conductive element 24 of the winding from sliding along the abutment surface into the interior of the stator and damaging it by clamping the electrical insulation 25.

[0059] The neck 221 advantageously forms a metallic material gap between the orthogonal radial contact surface 222 and the inner periphery 20 of the rotor. This gap prevents magnetic flux from propagating from one tooth 16 to another between the air gap 13 and the notch 22, representing a desired reduction in leakage to optimize the flow of magnetic flux around the electrical windings and through the rotor. Thus, the material gap forms a magnetic flux barrier. The fact that it has a variable width allows for the combination of a sufficiently wide material gap to effectively prevent magnetic flux from being directly transmitted radially from one tooth root 18 to another between the notch 22 and the inner periphery 20, and the combination of the large surface area of ​​material at the inner periphery 20 to optimize the amount of magnetic flux axially passing through the air gap 13 between the rotor and stator.

[0060] In the stator according to the invention, the narrow opening 224 allows for the material to have the large surface area at the level of the inner periphery 20, and the widened portion 223, whose width increases with the distance of the air gap 13, increases the effectiveness of the barrier that prevents flow leakage from one tooth root 18 to another tooth root 18.

[0061] Furthermore, the construction of the neck 221 ensures a minimum distance between the inner conductive element 24 and the rotor. The radial dimensions of the neck 221, particularly the sum of the radial dimensions of the widened portion 223 and the opening portion 224, are then considered to push the inner conductive element sufficiently away from the inner periphery 20 of the stator.

[0062] Furthermore, considering the previous dimensional characteristics, the radial dimension of the opening 224 must be minimized, especially for industrial feasibility. The stator body 14 is obtained by stacking layers that overlap each other along the longitudinal dimension, each layer being obtained by stamping. In this case, the opening 224 must be minimized so that the tooth root 18 formed due to the presence of the opening 224 is sufficiently robust.

[0063] Figure 5 A first embodiment of the notch is shown, which has already been implemented. Figure 4 The neck 221 is shown in the figure. The electrical insulator 25 rests on the abutment surface 222 and is pressed against the abutment surface by the conductive element 24, and in particular by the inner conductive element 24 (that is, the conductive element closest to the inner periphery 20 of the body 14).

[0064] The radial dimension of the entire neck 221 (from the abutment surface 222 to the inner periphery 20 of the stator) is approximately 2 mm, in particular to ensure a minimum distance of approximately 3 mm between the rotor and the inner conductive element 24 present in the notch 22.

[0065] The width of the neck 221 is variable because it gradually decreases from the abutment surface 222 of the receiving region 220 to form a widened portion 223. More specifically, in Figure 5 In the illustrated embodiment, the width of the neck 221 decreases linearly in such a way that an inclined plane is formed between the abutment surface 222 and the opening portion 224, which extends the widened portion to the inner periphery 20. In a plane orthogonal to the longitudinal extension axis X, that is, in such a plane… Figure 5 In the cross section shown, the widened portion 223 has a trapezoidal profile.

[0066] The opening 224 of the neck 221 has a width L224, which is constant and smaller than the average width of the widened portion 223.

[0067] For example, the opening 224 has a width L224 of approximately 0.5 mm. Without departing from the context of the invention, it can have a minimum value of 0.4 mm and a maximum value of 1.5 mm. And in this case, the variable width L223 of the widening portion 223 varies from the width of the opening (at the level of the joint with the opening, for example, 0.5 mm) to its maximum width (for example, 2 mm) at the abutment surface 222.

[0068] As described above, the minimum width of the opening 224 must be observed to avoid obtaining a brittle tooth root 18, while the maximum width of the opening 224 must not be exceeded to ensure that the inner periphery 20 has a sufficiently large surface area to allow magnetic flux between the rotor and stator to pass through the air gap 13. The maximum width of the widened portion 223 at the level of the abutment surface 222 (which may vary depending on the width of the corresponding notch 22) must be observed to ensure that sufficient support portion 225 is maintained to support the inner conductive element 24 on the abutment surface 222 of the notch.

[0069] In a non-limiting aspect of the invention, considering that Figure 5 The neck 221 in a plane perpendicular to the axis of rotation of the stator, the widened portion 223 can be defined by an inclined wall at an angle of approximately 30° to 50° relative to the radial dimension of the notch 22.

[0070] In other words, in this first embodiment, the notch 22 extends to the inner periphery 20 of the body 14 via a slot portion (here, the widened portion 223), the slot portion having a variable width formed by an inclined plane. Such an embodiment may be preferred, particularly due to the ease of manufacturing the inclined plane.

[0071] The second embodiment is in Figure 6 As shown, and differing from what has been previously described, is the shape of the widened portion. In particular, in the same plane orthogonal to the longitudinal extension axis X as previously described, the widened portion 223 this time has the shape of a portion of a circle with a radius of approximately 1 mm, the center of which can be specifically positioned in the plane of the abutment surface 222.

[0072] Since the width L223 of the widened portion 223 increases more rapidly at the junction between the widened portion 223 and the opening portion 224 than in the embodiment of the widened portion formed by the inclined plane, this embodiment may be preferred for its electromagnetic efficiency. This increases the barrier performance against magnetic flux leakage. Similarly, for the feasibility of each layer of the stator 4, a minimum width of the opening portion 224 must be observed without causing brittleness of the tooth root 18.

[0073] The third embodiment is in Figure 7 As shown, and differing from the previously described embodiments, the neck 221 comprises only a variable-width widening portion 223 that does not extend into the inner periphery 20 of the body 14. In other words, a portion of the stator body 14 lies between the neck 221 and the inner periphery 20 of the stator body.

[0074] This simplifies the cutting by stamping the layers of the stator 4, since there is no notch opening onto the inner periphery 20 of the body 14, and therefore no tooth root facing the notch 22 is formed.

[0075] Figure 8 and Figure 9 The dimensional features of the body 14 according to the invention are shown, and more specifically, the dimensional features of the neck 221 are shown, which relate to the dimensions of the electrical winding 6 intended to be received in the corresponding notch 22.

[0076] It should be noted that these dimensional features are shown with reference to a second embodiment of the notch, in which the neck 221 has a curved profile, but unless otherwise stated, these features may be applied to other embodiments of the notch.

[0077] More specifically, Figure 8The width of the neck 221 of the notch 22 is less than the corresponding dimension D of the conductive element 24 present in the notch 22, measured in the same orthogonal radial direction. The maximum width of the neck 221, that is, the width of the widened portion 223 at the level of the abutment surface 222, is less than the width of the conductive element 24, such that the inner conductive element 24 can be stably rested on the planar wall of the orthogonal radial direction forming the abutment surface 222. Therefore, it is ensured that the inner conductive element 24 can abut against at least one of the two support portions 225, wherein an insulator (not shown here) is located between the inner conductive element 24 and the abutment surface 222. For example, at the level of the abutment surface 222, the maximum width of the neck 221 is 50% to 80% of the value of the corresponding dimension of the inner conductive element 24 measured in the same orthogonal radial direction. In this way, it is ensured that the orthogonal radial dimension Do of the support surface 225 between the inner conductive element 24 and the abutment surface 22 is at least 20% of the width of the notch 22, which is distributed on one and / or the other of the two support portions 225.

[0078] Figure 9 More specifically, the width difference between the widened portion 223 and the opening portion 224 within the neck is shown. Therefore, the width of the neck 221 can be considered variable for two reasons. On the one hand, the average width of the widened portion 223 is greater than the average width of the opening portion 224. On the other hand, at least the width L223 of the widened portion 223 is variable from one radial end of the portion to the other radial end. More specifically, the width L223 of the widened portion 223 increases as it moves away from the air gap 13 to strengthen the barrier to the radial passage of magnetic flux by increasing the amount of air that must pass through to be directly transmitted from one tooth 16 to another. In particular, the average width L223 of the widened portion 223 is greater than the radial dimension Dr of the air gap 13, and this average width L223 can be defined as the average of the width of the widened portion at the adjacent surface 222 and the width of the widened portion at the junction with the opening portion 224.

[0079] Figure 9 The radial dimension of the neck 221 is also shown, which is defined such that the conductive element 24 can be pushed outward at a minimum distance Dm from the rotor. The radial dimension of the neck 221 is then calculated such that the sum of the radial dimension Dr224 of the opening 224 and the radial dimension Dr223 of the widened portion 223 (also taking into account the thickness of the insulation) is at least equal to the minimum distance Dm, ensuring that the radial dimension of the opening is sufficient to allow the stator layers to be stamped without damaging the stator teeth 16.

[0080] As can be seen from this specification, the present invention achieves its intended objectives by providing a stator and associated rotating motor that enable high electromagnetic performance without fundamentally modifying the stator structure. Modifications to the shape of the notches and the slots between these notches and the inner periphery of the stator allow for stability of the conductive elements of the electrical windings, particularly by presenting orthogonal radial contact surfaces, and by limiting magnetic flux leakage, especially through the variable shape of the slots, ensuring good transmission of magnetic flux around the electrical windings.

[0081] However, the invention is not limited to the devices and configurations described and shown herein, and it extends to any equivalent devices and configurations and any technically effective combinations thereof.

Claims

1. A stator (4) of a rotary electric machine (1) for a motor vehicle, intended to surround a rotor (10) of said rotary electric machine, said stator (4) extending along a longitudinal extension axis (X), said stator (4) comprising a main body (14) having an inner periphery (20) intended to face the rotor (10), said main body (14) comprising a plurality of stator teeth (16) delimiting a recess (22) extending radially within the main body (14) of the stator (4), from one longitudinal axial end to the other of said main body of the stator, said winding (6) comprising an element conductor (24) housed in said recess (22), characterized in that at least one recess (22) comprises a receiving zone (220) for said electrically conductive element (24) and a neck (221) extending said receiving zone (220) towards the inner periphery (20) of the main body (14) of the stator, said receiving zone (220) having an abutment face (222) preventing the electrically conductive element (24) from escaping in the direction of the inner periphery (20) in an orthogonal radial direction, said neck (221) having a width measured in an orthogonal radial direction, said width being variable over at least part of the distance between said abutment face (222) and said inner periphery (20).

2. The stator of claim 1, wherein The width of the neck (221) at the abutment face (222) of the receiving zone (220) is greater than the width of the neck (221) at the inner periphery (20) of the stator.

3. A stator according to claim 1 or 2, characterised in that The width of the neck (221) is variable, wherein the width of the neck (221) gradually decreases in the direction of the inner periphery (20) from the abutment face (222) of the receiving zone (220).

4. A stator according to claim 3, characterised in that The gradual decrease in the width of the neck (221) is linear.

5. A stator according to any one of the preceding claims, characterised in that, The neck (221) has a widened portion (223) of variable width and an opening portion (224) leading to the inner periphery (20).

6. The stator of claim 5, wherein The opening portion (224) of the neck (221) has a constant width.

7. A stator according to claim 5 or 6, characterised in that The height of the widened portion (223) in the radial direction is greater than the height of the opening portion (224) in the radial direction.

8. The stator of any one of claims 1 to 4, characterized in that, The neck (221) has a widened portion (223) whose width is variable from the abutment face (222) of the receiving zone (220) to the portion of the main body (14) of the stator (4) between the neck (221) and the inner periphery (20).

9. A stator according to any one of claims 5 to 8, characterised in that, The widened portion (223) is trapezoidal in a plane orthogonal to the longitudinal extension axis (X).

10. A stator according to any one of claims 5 to 8, characterised in that, The widened portion (223) is a portion of a circle in a plane orthogonal to the longitudinal extension axis (X).

11. A stator according to any one of the preceding claims, characterised in that The width of the neck (221) of the recess (22) at the height of the abutment face (222) is less than the corresponding dimension of the electrically conductive element (24) present in the recess (22) measured in the same orthogonal radial direction.

12. Stator according to the preceding claim, characterized in that The width of the neck (221) at the level of the abutment face (222) is a value of about 50% to 80% of the value of the corresponding dimension of the electrically conductive element (24) measured in the same radial orthogonal radial direction.

13. A rotary electric machine (1) comprising a rotor (10) and a stator (4) according to any one of the preceding claims, the inner periphery (20) of the stator (4) and the outer periphery (11) of the rotor (10) being arranged so as to form an air gap (13) therebetween.

14. A rotary electric machine according to the preceding claim, characterised in that, The electrically conductive element (24) consists of pins electrically connected to each other at the longitudinal axial ends of the stator (4).

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