Stator for axial flux rotating electric machine and rotating electric machine

Abstract

The invention relates to a stator (2) for a rotating electrical machine (1) with axial flux, comprising a rotor (3) having an axis of rotation (A), the stator (2) comprising: - elementary core sectors (4), each elementary core sector (4) forming teeth (5) adapted to interact with the rotor (3), - elementary windings (9), the elementary windings (9) each being wound around an elementary core sector (4), in which two adjacent elementary core sectors (4) are in contact in a first contact zone (12). The invention also relates to a rotating electrical machine with axial flux comprising such a stator. Figure for the abstract: Figure 1

Description

Title of the invention: Stator for axial flux rotating electrical machine and rotating electrical machine

[0001] The invention relates to a stator for an axial flux rotating electrical machine and to an axial flux rotating electrical machine equipped with such a stator.

[0002] A stator for a rotating electrical machine with axial flux comprising a rotor having an axis of rotation (A) is known from application WO2016034570A1, the stator comprising:

[0003] - elementary core sectors, each elementary core sector forming teeth capable of interacting with the rotor, each elementary core sector comprising a body as well as a first breech and a second breech, the first breech and the second breech being located circumferentially at the two ends of the body,

[0004] - elementary windings, each elementary winding being wound around a first yoke of an elementary core sector and a second yoke of an adjacent elementary core sector, so that each winding overlaps two adjacent elementary core sectors.

[0005] The elementary kernel sectors are inserted on a ring having an opening.

[0006] Such a stator has the disadvantage of being particularly complex and difficult to assemble. Indeed, the opening in the ring prevents the ring from holding at least one core sector. This core sector must have a different fastening system and therefore cannot be identical to the other core sectors. The number of different parts required to manufacture the stator results in a significant stator cost and thus a high cost for the rotating electrical machine. Furthermore, the presence of a hole in the core sectors for the ring insertion prevents the production of core sectors by radial stacking of laminations. The core sectors must therefore be made of more expensive materials such as soft magnetic composites (SMCs).This results in a high stator cost and therefore a high cost for the rotating electrical machine with high axial flux.

[0007] The present invention aims to resolve all or part of these drawbacks.

[0008] The invention relates to a stator for a rotating electrical machine with axial flux comprising a rotor having an axis of rotation, the stator comprising: - elementary core sectors, each elementary core sector forming teeth capable of interacting with the rotor, each elementary core sector comprising a first yoke and a first body, the first body extending axially between a first side and a second side of the elementary core sector, and the first yoke extending from the first body and having an orthoradial axis, - elementary windings, the elementary windings each being wound around the first yoke of an elementary core sector along the orthoradial axis of the first yoke, the elementary windings extending along the orthoradial axis between a first end of the elementary winding and a second end of the elementary winding, the first end of the elementary winding facing the first body of the elementary core sector around which the elementary winding is wound, in which two adjacent elementary core sectors are in contact in a first contact zone located circumferentially at the level of the second end of the winding or circumferentially distant from the winding.

[0009] Such a stator allows for simplified manufacturing. Indeed, such elementary core sectors, each carrying an elementary winding, are easily radially assembled. Furthermore, the elementary core sectors and windings are standardized. It is thus possible to reduce the cost of the axial flux rotating electrical machine. Such a stator also allows for a reduction in the size of the windings, the windings being portions of the elementary windings that extend radially inside and outside the first yokes.

[0010] According to a further feature of the invention, the elementary core sectors each comprise a first tooth foot extending circumferentially from the first body on the first side of the elementary core sector, a first notch space being formed between the first tooth foot and the elementary core sector adjacent to the first tooth foot.

[0011] The use of such a first tooth root improves the magnetic flux between the rotor and the stator. The performance of the rotating electrical machine is therefore improved. Furthermore, such a first tooth root reduces torque ripple in the axial flux rotating electrical machine. The noise of the axial flux rotating electrical machine is thus reduced.

[0012] According to a further feature of the invention, the elementary core sectors each comprise two first tooth feet extending circumferentially from the first body on the first side and the second side of the elementary core sector, with first notch spaces being formed between the first tooth feet and the elementary core sector adjacent to the first tooth feet.

[0013] The use of first tooth roots on each side of the elementary core sectors and therefore on each side of the stator makes it possible to improve the magnetic fluxes between the stator and two rotors located axially on either side of the stator. In effect, the first teeth allow for better channeling of the magnetic flux lines in the air gap between the teeth and the rotors. The performance of the rotating electrical machine is therefore improved.

[0014] According to a further feature of the invention, the elementary core sectors each comprise a second tooth foot extending circumferentially from the first body in a circumferentially opposite direction to the first tooth foot, the notch space being formed between the first tooth foot and second tooth foot of two adjacent elementary core sectors.

[0015] The use of such a second tooth in addition to the first tooth further improves the magnetic flux between the rotor and the stator. The performance of the rotating electrical machine is therefore enhanced. Furthermore, the use of a second tooth in addition to the first tooth allows, for the same notch spacing, a reduction in the length of the first tooth. Shorter tooth feet facilitate the fabrication of the elementary core sectors. The robustness of the rotating electrical machine is also improved.

[0016] According to a further feature of the invention, the elementary core sectors each comprise two second tooth feet extending circumferentially from the first body in a circumferentially opposite direction to the first tooth feet, notch spaces being formed between one of the first tooth feet and one of the second tooth feet of two adjacent elementary core sectors and between the other of the first tooth feet and the other of the second tooth feet of the two adjacent elementary core sectors.

[0017] The use of such second tooth feet in addition to the first tooth feet allows for a further improvement in the magnetic flux between the rotor and the stator. The performance of the rotating electrical machine is therefore improved. Moreover, the use of second tooth feet in addition to the first tooth feet allows, for an equal notch spacing, a reduction in the length of the first tooth feet. Shorter tooth feet facilitate the manufacturing of the elementary core sectors. The robustness of the rotating electrical machine is also improved.

[0018] According to an additional feature of the invention, the first contact zone is a first connection by complementary shapes allowing a hold between the two adjacent elementary core sectors in the circumferential direction and in the axial direction and allowing a sliding in the radial direction between the two adjacent elementary core sectors, the first connection by complementary shapes being in particular a dovetail connection or a T-shaped connection or a cylindrical sliding connection.

[0019] Such an initial connection through complementary shapes allows for good retention circumferential of the elementary core sectors relative to each other. The positioning of the stator teeth is thus more precise and the performance of the rotating electrical machine with axial flux is improved.

[0020] According to a further feature of the invention, the elementary core sectors comprise a radial stack of sheets, in particular a radial stack of flat sheets.

[0021] According to a further feature of the invention, the stator comprises an outer ring and an inner ring, the elementary core sectors comprising a radially outer surface and a radially inner surface, the radially outer surface of the elementary core sectors being in contact with the outer ring and the radially inner surface of the elementary core sectors being in contact with the inner ring.

[0022] The use of such an outer and inner ring allows for good radial positioning of the elementary core sectors. This makes it possible to improve the relative positioning between the rotor poles and the stator teeth. The performance of the electric machine is therefore improved.

[0023] According to a further feature of the invention, the stator comprises a first number (m) of phases, each phase occupying at least one distinct elementary stator sector, each elementary stator sector comprising: - a plurality of elementary core sectors and elementary windings, the elementary windings of an elementary stator sector forming a phase winding, - a first end kernel sector and a second end kernel sector, the plurality of elementary kernel sectors being located circumferentially between the first end kernel sector and the second end kernel sector, the first end core sector comprising a second body, the second body facing the second end of the elementary winding wound on the adjacent elementary core sector, the second body extending axially between a first side and a second side of the first end core sector, the first end core sector and the elementary core sector adjacent to the first end core sector being in contact in a second contact zone located circumferentially at the second end of the elementary winding wound on the adjacent elementary core sector or circumferentially distant from the elementary winding wound on the adjacent elementary core sector, the second end core sector comprising a third body and a second breech, the third body extending axially between a first side and a second side of the second end core sector, and the second yoke extending from the third body and having an orthoradial axis, an elementary winding being wound around the second yoke of the second end core sector along the orthoradial axis of the second yoke, the first end of the elementary winding facing the first body of the elementary core sector adjacent to the second end core sector, the second end core sector and the elementary core sector adjacent to the second end core sector are in contact in a third contact zone located circumferentially at the first end of the elementary winding or circumferentially distant from the elementary winding.

[0024] Such distinct elementary stator sectors for the phases make it possible to increase the number of poles of a rotating electrical machine with axial flux without reducing the width of the stator teeth. Wider stator teeth facilitate stator winding. This makes it possible to simplify stator manufacturing and thus reduce its cost. In addition, such distinct elementary stator sectors allow for a reduction of subharmonics.

[0025] According to a further feature of the invention, the first end sector and / or the second end sector comprise a radial stack of sheets, in particular a radial stack of flat sheets.

[0026] According to a further feature of the invention, the second contact zone is a second complementary shape connection allowing a hold between the first end core sector and the elementary core sector adjacent to the first end core sector in the circumferential direction and in the axial direction and allowing a sliding in the radial direction between the first end core sector and the elementary core sector adjacent to the first end core sector, the second complementary shape connection being in particular a dovetail connection or a T-shaped connection or a cylindrical sliding connection.

[0027] Such a second connection through complementary shapes allows for good circumferential support between the first end core sector and the adjacent elementary core sector. The positioning of the stator teeth is thus more precise, and the performance of the axially flux rotating electrical machine is improved.

[0028] According to a further feature of the invention, the third contact zone is a third connection by complementary shapes allowing a hold between the second end core sector and the elementary core sector adjacent to the second end core sector in the circumferential direction and in the axial direction and allowing sliding in the radial direction between the second end core sector and the elementary core sector adjacent to the second end core sector, the third connection by complementary shape being in particular a dovetail joint or a T-shaped joint or a cylindrical slide joint.

[0029] Such a third connection through complementary shapes allows for good circumferential support between the second end core sector and the adjacent elementary core sector. The positioning of the stator teeth is thus more precise, and the performance of the axially flux-rotating electrical machine is improved.

[0030] According to a further feature of the invention, the first end core sector and the second end core sector of two adjacent elementary stator sectors are separated by a flux barrier, in particular a flux barrier made of a non-magnetic material, in particular a flux barrier made of a plastic material.

[0031] Such a flux barrier makes it possible to limit magnetic leakage between the elementary stator sectors. The performance of the axial flux rotating electric machine is thus increased.

[0032] According to a further feature of the invention, the first and second end core sectors comprise a radially external surface and a radially internal surface, the radially external surface of the first and second end core sectors being in contact with the outer ring and the radially internal surface of the first and second end core sectors being in contact with the inner ring. With such a flux barrier, the dimensions of the flux barrier can be adjusted according to the actual dimensions of the elementary core sectors, the first and second end core sectors. The dimensional tolerances on the elementary core sectors, the first and second end core sectors can be increased.This simplifies stator assembly and reduces the cost of the stator.

[0033] The use of such an outer and inner ring allows for good radial positioning of the first and second end core sectors. This makes it possible to improve the relative positioning between the rotor poles and the stator teeth. The performance of the electric machine is therefore improved.

[0034] According to a further feature of the invention, the flow barriers are formed of material with the outer ring and / or the inner ring.

[0035] The invention also relates to a rotating axial flux electrical machine comprising: - a stator (2) according to one of the preceding claims, - a rotor (3) facing axially to the stator (2).

[0036] The rotating electrical machine may include a power electronic component suitable for connection to a vehicle's on-board electrical system. This power electronic component includes, for example, an inverter / rectifier that, depending on whether the rotating electrical machine is operating as a motor or a generator, can either load the vehicle's on-board electrical system or be electrically powered from it.

[0037] The invention will be better understood upon reading the following description of non-limiting examples of its implementation and upon examination of the accompanying drawing in which:

[0038] - [Fig. 1] [Fig. 1] represents a partial schematic view of an electrical machine axial flux rotating device comprising a stator according to a first embodiment of the invention

[0039] - [Fig.2] [Fig.2] represents a partial exploded schematic view of the machine rotating electrical axial flux of the [Fig.l],

[0040] - [Fig.3] [Fig.3] represents a partial exploded schematic view of the stator according to the first embodiment of the invention,

[0041] - [Fig.4] [Fig.4] represents a partial schematic view of the stator of [Fig.3],

[0042] - [Fig.5] [Fig.5] represents a partial schematic view of the stator of [Fig.3],

[0043] - [Fig.6] [Fig.6] represents a partial schematic view of a stator according to a second embodiment of the invention,

[0044] In all the figures, identical elements or elements performing the same function are identified by the same reference numerals. The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference numeral 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 embodiments.

[0045] Ordinal numeral adjectives are used to differentiate features. They do not define the position of a feature. Therefore, for example, a third feature of a product does not mean that the product has a first and / or a second feature.

[0046] Figure 1 shows a schematic partial view of a rotating electrical machine 1 with axial flux comprising a stator 2 and a rotor 3 facing axially to the stator 2 and having an axis of rotation A. The rotating electrical machine 1 with axial flux comprises, for example, two rotors 3. The two rotors 3 are, for example, on either side of the stator in the axial direction. Each of the rotors may comprise a second number of pole pairs. For example, the second number of pole pairs poles is equal to ten.

[0047] For the purposes of the invention, unless otherwise specified, the terms radial and ra-dialy are understood with respect to the axis of rotation A. For the purposes of the invention, unless otherwise specified, the terms axial, axially, longitudinal and longitudinally mean in the direction of the axis of rotation A.

[0048] Figure 2 shows a partial exploded schematic view of the axial flux rotating electric machine of Figure 1. The stator 2 comprises elementary core sectors 4, each elementary core sector 4 forming teeth 5 adapted to interact with the rotor 3. Each elementary core sector 4 comprises a first yoke 5 and a first body 6. The first body 6 extends axially between a first side 7 and a second side 8 of the elementary core sector 4. The first yoke 5 extends from the first body 6 and has an orthoradial axis,

[0049] The elementary core sectors 4 may include a radial stack of sheets, in particular a radial stack of flat sheets. In the embodiments shown in the figures, the elementary core sectors 4 include such a radial stack of flat sheets.

[0050] In another embodiment not shown, the elementary core sectors are made of soft magnetic composite materials (SMC or Soft Magnetic Composite).

[0051] The stator 2 also includes elementary windings 9. The elementary windings 9 are each wound around the first yoke 5 of an elementary core sector 4 along the orthoradial axis of the first yoke 5. The elementary windings 9 extend along the orthoradial axis between a first end 10 of the elementary winding 9 and a second end 11 of the elementary winding 9, the first end 10 of the elementary winding 9 facing the first body 6 of the elementary core sector 4 around which the elementary winding is wound.

[0052] Two adjacent elementary core sectors 4 are in contact in a first contact zone 12 located circumferentially at the level of the second end 11 of the winding 9 or circumferentially distant from the winding 9.

[0053] The elementary core sectors 4 can each include a first tooth foot 13 extending circumferentially from the first body 6 on the first side of the elementary core sector 4. A first notch space 14 thus formed between the first tooth foot 13 and the elementary core sector 4 adjacent to the first tooth foot 13.

[0054] The elementary core sectors 4 may also each comprise a second tooth foot 15 extending circumferentially from the first body 6 in a circumferential direction opposite to the first tooth foot 13. The space notch 14 is then formed between the first tooth foot 13 and second tooth foot 15 of two adjacent elementary core sectors 4.

[0055] The elementary core sectors 4 may also each include two first tooth feet 13 extending circumferentially from the first body 6 on the first side 7 and the second side 8 of the elementary core sector 4, with first notch spaces 14 being formed between the first tooth feet and the elementary core sector 4 adjacent to the first tooth feet 13. The embodiments of the invention shown in the figures include two rotors 3. Such first tooth feet face each of the two rotors 3.

[0056] The elementary core sectors 4 may also each comprise two second tooth feet 15 extending circumferentially from the first body 6 in a circumferential direction opposite to the first tooth feet 13. The notch spaces 14 are then formed between one of the first tooth feet 13 and one of the second tooth feet 15 of two adjacent elementary core sectors 4, and between the other first tooth feet 13 and the other second tooth feet 15 of the two adjacent elementary core sectors 4. The embodiments shown in the figures include such first tooth feet and such second tooth feet.

[0057] The first and second tooth feet are visible on [Fig.3] and on [Fig.4].

[0058] The first contact zone 12 is, for example, a first complementary shape joint. This first complementary shape joint allows, in particular, for retention between the two adjacent elementary core sectors 4 in the circumferential and axial directions. The first complementary shape joint can also allow sliding in the radial direction between the two adjacent elementary core sectors 4. In the embodiments of the invention shown in the figures, the first complementary shape joint is a cylindrical sliding joint.

[0059] In another embodiment of the invention not shown, the first connection by complementary shape is a dovetail connection.

[0060] In another embodiment of the invention not shown, the first connection by complementary shape is a T-shaped connection.

[0061] The stator may comprise a first number m of phases, each phase occupying at least one distinct elementary stator sector 20, in particular each phase occupies a distinct elementary stator sector 20. In the embodiments of the invention shown in the figures, the first number m of phases is equal to three and the stator comprises three elementary stator sectors 20.

[0062] Each elementary stator sector 20 may include:

[0063] - a plurality of elementary kernel sectors 4 and elementary windings 9, the elementary windings 9 of an elementary stator sector 20 forming a phase winding,

[0064] - a first end-core sector 21 and a second end-core sector of end 22, the plurality of elementary kernel sectors 4 being located circumferentially between the first end kernel sector 21 and the second end kernel sector 22.

[0065] The first end core sector 21 may include a second body 23. The second body 23 may face the second end 11 of the elementary winding 9 wound on the adjacent elementary core sector 4. The second body may extend axially between a first side 7 and a second side 8 of the first end core sector 21. The first end core sector 21 and the elementary core sector 4 adjacent to the first end core sector 21 are in contact in a second contact zone 24. The second contact zone 24 may be located circumferentially at the second end 11 of the elementary winding 9 wound on the adjacent elementary core sector 4 or circumferentially distant from the elementary winding 9 wound on the adjacent elementary core sector 4.

[0066] The second end core sector 22 may include a third body 25 and a second yoke 26. The third body 25 may extend axially between a first side 7 and a second side 8 of the second end core sector 22. The second yoke 26 may extend from the third body 25 and have an orthoradial axis, an elementary winding 9 being wound around the second yoke 26 of the second end core sector 22 along the orthoradial axis of the second yoke 26. The first end 10 of the elementary winding 9 may face the first body 6 of the elementary core sector 4 adjacent to the second end core sector 22.

[0067] The second end core sector 22 and the elementary core sector 4 adjacent to the second end core sector 22 can be in contact in a third contact zone 27 located circumferentially at the level of the first end of the elementary winding 9 or circumferentially distant from the elementary winding 9.

[0068] In the embodiments of the invention shown in the figures, each of the three elementary stator sectors 20 comprises five elementary core sectors 4.

[0069] The first end sector 21 may include a radial stack of sheets, in particular a radial stack of flat sheets. In the embodiments shown in the figures, the first end sectors include such an em- radial stacking of flat sheets.

[0070] In another embodiment not shown, the first end sectors are made of soft magnetic composite materials (SMC).

[0071] The second end sector 22 may include a radial stack of sheets, in particular a radial stack of flat sheets.

[0072] In another embodiment not shown, the second end sectors are made of soft magnetic composite materials (SMC).

[0073] The second contact zone 24 is, for example, a second complementary shape joint. This second complementary shape joint can maintain contact between the first end core sector 21 and the elementary core sector 4 adjacent to the first end core sector 21 in both the circumferential and axial directions. The second complementary shape joint can also allow sliding in the radial direction between the first end core sector 21 and the elementary core sector 4 adjacent to the first end core sector 21. In the embodiments of the invention shown in the figures, the second complementary shape joint is a cylindrical sliding joint.

[0074] In another embodiment of the invention not shown, the second connection by complementary shape is a dovetail connection.

[0075] In another embodiment of the invention not shown, the second connection by complementary shape is a T-shaped connection.

[0076] The third contact zone 27 is, for example, a third complementary shape joint. This third complementary shape joint can maintain contact between the second end core sector 22 and the elementary core sector 4 adjacent to the second end core sector 22 in both the circumferential and axial directions. The third complementary shape joint can also allow sliding in the radial direction between the second end core sector 22 and the elementary core sector 4 adjacent to the second end core sector 22. In the embodiments of the invention shown in the figures, the third complementary shape joint is a cylindrical sliding joint.

[0077] In another embodiment of the invention not shown, the third connection by complementary shape is a dovetail connection.

[0078] In another embodiment of the invention not shown, the third connection by complementary shape is a T-shaped connection.

[0079] The first end core sector 21 and the second end core sector 22 of two adjacent elementary stator sectors 20 can be separated by a flux barrier 28. The flux barrier 28 is, for example, implemented in a non-magnetic material. The flux barrier 28, for example, is made of a plastic material.

[0080] As shown in [Fig. 1], [Fig. 2], and [Fig. 5], representing the first embodiment of the invention, the stator may include an outer ring 16 and an inner ring 17. The elementary core sectors 4, the first end core sectors 21, and the second end core sectors 22 may include a radially external surface 18 and a radially internal surface 19. The radially external surface 18 of the elementary core sectors 4, the first end core sectors 21, and the second end core sectors 22 is, for example, in contact with the outer ring 16. The radially internal surface 19 of the elementary core sectors 4, the first end core sectors 21, and the second end core sectors 22 is, for example, in contact with the inner ring 17.

[0081] As shown in [Fig. 1], [Fig. 2] and [Fig. 5], the outer ring 16 may include a first annular portion 31 and internal support lugs 29. The internal support lugs 29 may be in contact with the radially external surface 18 of the elementary core sectors 4, the first end core sectors 21 and the second end core sectors 22. A circumferential space between the internal support lugs 29 may allow the passage of the elementary windings 9.

[0082] For example, the outer crown is made of an electrically non-conductive material. For example, the outer crown is made of a plastic material, in particular PVC, PA66, PEEK, or liquid crystal polymer (LCP). For example, the outer crown is made of a non-magnetic material.

[0083] Similarly, the inner ring 17 may include a second annular part 32 and external support lugs 30. The external support lugs 30 may be in contact with the radially internal surface 19 of the elementary core sectors 4, the first end core sectors 21 and the second end core sectors 22. A circumferential space between the external support lugs 30 may allow the passage of the elementary windings 9.

[0084] The stator may include a plurality of external rings 16. The first embodiment of the invention includes, for example, two external rings 16.

[0085] Similarly, the stator can comprise a plurality of internal rings 17. The first embodiment of the invention comprises, for example, two internal rings 17.

[0086] For example, the inner ring is made of an electrically non-conductive material. For example, the inner ring is made of a plastic material particularly in PVC, PA66, PEEK or liquid crystal polymer (LCP). For example, the inner ring is made of a non-magnetic material.

[0087] As in the embodiments of the invention shown in the figures, the flow barriers 27 can be formed of material with the outer ring 16 and the inner ring 17.

[0088] In another embodiment of the invention not shown, the flow barriers 27 are formed of material with the outer ring 16.

[0089] In another embodiment of the invention not shown, the flow barriers 27 are formed of material with the inner ring 17.

[0090] Figure 6 represents a second embodiment of the invention. The second embodiment of the invention is similar to the first embodiment of the invention; however, the outer ring 16 does not include internal support lugs, and the inner ring 17 does not include external support lugs. The positioning of the elementary core sectors 4, the first end core sectors 21, and the second end core sectors 22 relative to the inner and outer rings is, for example, achieved with a positioning tool during manufacturing and fixed using a curable resin, for example, a thermosetting resin.

[0091] In another embodiment not shown, the stator does not comprise first end core sectors and second end core sectors. The stator comprises, for example, a set of elementary core sectors, each elementary core sector being adjacent to two other elementary core sectors.

Claims

1. Claims Stator (2) for an axial flux rotating electrical machine (1) comprising a rotor (3) having an axis of rotation (A), the stator (2) comprising: a. elementary core sectors (4), each elementary core sector (4) forming teeth (5) capable of interacting with the rotor (3), each elementary core sector (4) comprising a first yoke (5) and a first body (6), the first body (6) extending axially between a first side (7) and a second side (8) of the elementary core sector (4), and the first yoke (5) extending from the first body (6) and having an orthoradial axis, b. elementary windings (9), the elementary windings (9) each being wound around the first yoke (5) of an elementary core sector (4) along the orthoradial axis of the first yoke (5), the elementary windings (9) extending along the orthoradial axis between a first end (10) of the elementary winding (9) and a second end (11) of the elementary winding (9), the first end (10) of the elementary winding (9) facing the first body (6) of the elementary core sector (4) on which the elementary winding (9) is wound, in which two adjacent elementary core sectors (4) are in contact in a first contact zone (12) situated circumferentially at the level of the second end (11) of the winding (9) or circumferentially distant from the winding (9) the stator further comprising a first number (m) of phases, each phase occupying at least one distinct elementary stator sector (20), each elementary stator sector (20) comprising: a. a plurality of elementary core sectors (4) and elementary windings (9), the elementary windings (9) of an elementary stator sector (20) forming a phase winding, b. a first end core sector (21) and a second end core sector (22), the plurality of end core sectors elementary cores (4) being located circumferentially between the first end core sector (21) and the second end core sector (22), the first end core sector (21) comprising a second body (23), the second body (23) facing the second end (11) of the elementary winding (9) wound on the adjacent elementary core sector (4), the second body extending axially between a first side (7) and a second side (8) of the first end core sector (21),the first end core sector (21) and the elementary core sector (4) adjacent to the first end core sector (21) being in contact in a second contact zone (24) located circumferentially at the second end (11) of the elementary winding (9) wound on the adjacent elementary core sector (4) or circumferentially distant from the elementary winding (9) wound on the adjacent elementary core sector (4), the second end core sector (22) comprising a third body (25) and a second yoke (26), the third body (25) extending axially between a first side (7) and a second side (8) of the second end core sector (22), and the second yoke (26) extending from the third body (25) and having an orthoradial axis,an elementary winding (9) being wound around the second yoke (26) of the second end core sector (22) along the orthoradial axis of the second yoke (26), the first end (10) of the elementary winding (9) facing the first body (6) of the elementary core sector (4) adjacent to the second end core sector (22), the second end core sector (22) and the elementary core sector (4) adjacent to the second end core sector (22) are in contact in a third contact zone (27) located circumferentially at the first end of the elementary winding (9) or circumferentially distant from the elementary winding (9.,

2. Stator (2) for axial flux rotating electrical machine (1) according to the preceding claim in which the elementary core sectors (4) each comprise a first tooth root (13) extending circum- ferentially from the first body (6) on the first side of the elementary core sector (4), a first notch space (14) being formed between the first tooth root (13) and the elementary core sector (4) adjacent to the first tooth root (13).

3. Stator (2) for an axial flux rotating electrical machine (1) according to claim 1 in which the elementary core sectors (4) each comprise two first tooth roots (13) extending circumferentially from the first body (6) on the first side (7) and the second side (8) of the elementary core sector (4), first notch spaces (14) being formed between the first tooth roots and the elementary core sector (4) adjacent to the first tooth roots (13).

4. Stator (2) for axial flux rotating electrical machine (1) according to one of claims 2 and 3 in which the elementary core sectors (4) each comprise a second tooth root (15) extending circumferentially from the first body (6) in a direction circumferentially opposite to the first tooth root (13), the notch space (14) being formed between the first tooth root (13) and second tooth root (15) of two adjacent elementary core sectors (4).

5. Stator (2) for axial flux rotating electrical machine (1) according to claim 3 wherein the elementary core sectors (4) each comprise two second tooth roots (15) extending circumferentially from the first body (6) in a direction circumferentially opposite to the first tooth roots (13), notch spaces (14) being formed between one of the first tooth roots (13) and one of the second tooth roots (15) of two adjacent elementary core sectors (4) and between the other of the first tooth roots (13) and the other of the second tooth roots (15) of the two adjacent elementary core sectors (4).

6. Stator (2) for an axial flux rotating electrical machine (1) according to one of the preceding claims, in which the first contact zone (12) is a form-fitting connection allowing a hold between the two adjacent elementary core sectors (4) in the circumferential direction and in the axial direction and allowing sliding in the radial direction between the two adjacent elementary core sectors (4), the form-fitting connection being in particular a dovetail connection or a T-shaped connection or a cylindrical slide connection.

7. Stator (2) for an axial flux rotating electrical machine (1) according to one of the preceding claims comprising an outer ring (16) and an inner ring (17), the elementary core sectors (4) comprising a radially outer surface (18) and a radially inner surface (19), the radially outer surface (18) of the elementary core sectors (4) being in contact with the outer ring (16) and the radially inner surface (19) of the elementary core sectors (4) being in contact with the inner ring (17).

8. Stator (2) for axial flux rotating electrical machine (1) according to claim 1 in which the first end sector (21) and / or the second end sector (22) comprise a radial stack of sheets, in particular a radial stack of flat sheets.

9. Stator (2) for an axial flux rotating electrical machine (1) according to any one of the preceding claims, in which the second contact zone (24) is a form-fitting connection allowing a hold between the first end core sector (21) and the elementary core sector (4) adjacent to the first end core sector (21) in the circumferential direction and in the axial direction and allowing sliding in the radial direction between the first end core sector (21) and the elementary core sector (4) adjacent to the first end core sector (21), the form-fitting connection being in particular a dovetail connection or a T-shaped connection or a cylindrical slide connection.

10. Stator (2) for axial flux rotating electrical machine (1) according to any one of the preceding claims wherein the third contact zone (27) is a form-fitting connection allowing a hold between the second end core sector (22) and the elementary core sector (4) adjacent to the second end core sector (22) in the circumferential direction and in the axial direction and allowing sliding in the radial direction between the second end core sector (22) and the elementary core sector (4) adjacent to the second end core sector (22), the form-fitting connection being in particular a dovetail connection or a T-shaped connection or a cylindrical slide connection.

11. Stator (2) for axial flux rotating electrical machine (1) according to any one of the preceding claims in which the first end core sector (21) and the second end core sector (22) of two adjacent elementary stator sectors (20) are separated by a flux barrier (28), in particular a flux barrier (28) made of a non-magnetic material, in particular a flux barrier (28) made of a plastic material.

12. Stator (2) for axial flux rotating electrical machine (1) according to any one of the preceding claims taken in combination with claim 8 wherein the first end core sectors (21) and the second end core sectors (22) comprise a radially outer surface (18) and a radially inner surface (19), the radially outer surface (18) of the first end core sectors (21) and the second end core sectors (22) being in contact with the outer ring (16) and the radially inner surface (19) of the first end core sectors (21) and the second end core sectors (22) being in contact with the inner ring (17).

13. Stator (2) for a rotating electrical machine (1) with axial flux according to the preceding claim taken in combination with claim 11 in which the flux barriers (27) are formed in one piece with the outer ring (16) and / or the inner ring (17).

14. A rotating electrical machine (1) with axial flux comprising: a. a stator (2) according to one of the preceding claims, b. a rotor (3) axially facing the stator (2) and having an axis of rotation (A).

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