Axial flux rotating electric machine

Abstract

Axial flux rotating electrical machine The invention relates to an axial flux rotating electrical machine (2), in particular of the permanent magnet type, having an axis of rotation (X) and comprising at least one stator and at least one rotor arranged face to face with the stator, in the axial direction. This machine comprises an electrical connection assembly (8) comprising: - at least one bus bar (10) arranged to make an electrical connection between at least one electrical winding (14) of the electrical machine (2) and an external electrical device; and - a hollow body (16) within which a heat transfer fluid circulation channel (18) is defined. This hollow body (16) is configured to house the at least one bus bar (10) such that this bus bar (10) extends at least partially into the heat transfer fluid circulation channel (18). Abstract figure: Fig. 3

Description

Title of the invention: Axial flux rotating electric machine

[0001] The present invention relates to an axial flux rotating electrical machine, in particular of the permanent magnet type.

[0002] An axial flux electrical machine is known, in particular of the permanent magnet type, having an axis of rotation and comprising at least one stator and at least one rotor arranged face to face with the stator, in the axial direction, this machine comprising an electrical connection assembly.

[0003] The electrical connection assembly comprises at least one bus bar, made of conductive material, in particular copper. This bus bar is arranged to make an electrical connection between a plurality of electrical windings of the electrical machine and an external electrical device, for example a battery pack.

[0004] When the electrical machine is in operation, the bus bar and the electrical connection assembly may be traversed by a significant current, which has the effect of heating them.

[0005] The bus bar must be cooled in order for the electrical machine to operate optimally. Ideally, it can be cooled by a heat transfer fluid such as a dielectric fluid.

[0006] A known strategy is to increase the cross-section of the bus bar in order to promote heat exchange between the heat transfer fluid and the bus bar and to reduce Joule losses within it. This then makes it possible to avoid the appearance of hot spots. However, this would increase the quantity of conductive material required to manufacture the bus bar, which would increase the manufacturing cost of the electrical connection assembly.

[0007] The invention makes it possible to overcome these drawbacks. One of the objectives of the invention is to optimize the heat exchange between the bus bar and the heat transfer fluid while reducing the manufacturing cost of an electrical connection assembly.

[0008] The invention thus relates to an axial flux rotating electrical machine, in particular of the permanent magnet type, having an axis of rotation and comprising at least one stator and at least one rotor arranged face to face with the stator, in the axial direction, this machine comprising an electrical connection assembly comprising: - at least one bus bar arranged to make an electrical connection between at least one electrical winding of the electrical machine and an external electrical device; and - a hollow body within which a heat transfer fluid circulation channel is defined; and this hollow body being configured to house the at least one bus bar such that this bus bar extends at least partially into the heat transfer fluid circulation channel.

[0009] Thanks to the invention, the heat transfer fluid circulation channel is located within the electrical connection assembly itself. In this way, better compactness of the axial flux electrical machine can be obtained.

[0010] The heat transfer fluid circulating in the circulation channel can be in direct contact with the bus bar. Thus, the bus bar can be cooled directly and efficiently in order to optimize the heat exchange between the bus bar and the heat transfer fluid.

[0011] Furthermore, the direct contact between the heat transfer fluid and the bus bar makes it possible to reduce the quantity of conductive material forming the bus bar compared to the case where the contact would not be direct between the heat transfer fluid and the bus bar. Therefore, it is possible to reduce the weight and the dimensions, strong constraints in particular in the automotive field, as well as the manufacturing cost of the electrical connection assembly and therefore of the axial flux rotating electrical machine.

[0012] According to one aspect of the invention, the electrical connection assembly comprises a heat transfer fluid inlet.

[0013] According to one aspect of the invention, the heat transfer fluid supply inlet has a cylindrical shape.

[0014] According to one aspect of the invention, the bus bar is circumferential.

[0015] According to one aspect of the invention, the bus bar has an annular shape.

[0016] According to one aspect of the invention, the bus bar is associated with a phase electric.

[0017] According to one aspect of the invention, the electrical connection assembly comprises a plurality of bus bars.

[0018] According to one aspect of the invention, the electrical connection assembly comprises at least three bus bars, each bus bar being associated with an electrical phase.

[0019] Thus, the at least three bus bars are associated with three different phases.

[0020] According to one aspect of the invention, the electrical connection assembly further comprises a bus bar forming an electrical neutral.

[0021] In a conventional three-phase system, there are three bus bars (three phases) and one neutral conductor. Each phase is 120 degrees out of phase with the others, which provides a more stable and uniform flow of power.

[0022] According to a variant of the invention, the electrical connection assembly comprises:

[0023] - two three-phase systems, each three-phase system comprising: • three bus bars, each bar being associated with an electrical phase; • a neutral; and these three-phase systems being interconnected with each other to form a double three-phase system.

[0024] A three-phase dual system can be, for example, a three-phase double star system or a star-delta system. Thanks to this three-phase dual system, different voltage combinations can be obtained, thus offering more flexibility in the distribution of electrical energy. This system is particularly suitable for a hybrid motorization system of a vehicle.

[0025] According to one aspect of the invention, the bus bars are in the form of rings such that they are nested relative to each other with a radial spacing between the bus bars.

[0026] According to another aspect of the invention, the bus bars are in the form of open rings.

[0027] The dimensions of some of the bus bars, for example the dimensions of the bus bars arranged to allow electrical connections between adjacent electrical windings may be shorter than the other bus bars.

[0028] According to one aspect of the invention, the bus bars may be axially aligned with an axial spacing between the bus bars.

[0029] According to one aspect of the invention, the bus bars have different dimensions from each other.

[0030] According to one aspect of the invention, the bus bars have the same dimensions between them.

[0031] According to one aspect of the invention, the hollow body comprises at least one group of projection orifices arranged to cool hot elements of the electrical machine, for example the electrical windings.

[0032] According to one aspect of the invention, the hollow body of the electrical connection assembly is made from a single piece, in particular the hollow body being made of plastic, in particular by molding.

[0033] The invention makes it possible to facilitate the construction of the axial flux electric machine, since a reduced number of parts is used, including the aforementioned hollow body, made from a single piece.

[0034] According to one aspect of the invention, the hollow body comprises an internal skirt configured to be oriented towards the center of the axis of rotation and an external skirt connected to the internal skirt by two annular walls of the electrical connection assembly, these annular walls being opposite each other.

[0035] Advantageously, the internal skirt is located on a face oriented opposite to the external skirt.

[0036] According to one aspect of the invention, the internal and external skirts are parallel to each other.

[0037] According to one aspect of the invention, the hollow body comprises at least two annular walls facing each other.

[0038] According to one aspect of the invention, the internal skirt of the electrical connection assembly comprises the group of projection orifices arranged to cool the electrical winding, called the first group of projection orifices.

[0039] According to one aspect of the invention, one of the annular walls of the hollow body comprises the second group of projection orifices.

[0040] According to one aspect of the invention, the second group of projection orifices is configured to project heat transfer fluid parallel to the axis of rotation of the axial flux rotating electrical machine.

[0041] According to another aspect of the invention, the second group of projection orifices is oriented towards the air gap.

[0042] According to another aspect of the invention, the second group of projection orifices is oriented towards the opposite side of the air gap.

[0043] According to one aspect of the invention, the orifices of the second group of projection orifices are arranged all around the annular wall of the hollow body, with a regular pitch between them.

[0044] According to a variant of the invention, the second group of projection orifices has larger dimensions than those of the first group of projection orifices, in particular a larger diameter than that of the first group of projection orifices.

[0045] According to one aspect of the invention, the electrical connection assembly comprises a holding member configured to hold the bus bar in position in the channel.

[0046] According to one aspect of the invention, the holding member comprises a plurality of spacers, each being inserted between two neighboring bus bars spaced apart with an inter-bar gap.

[0047] According to one aspect of the invention, the holding member comprises a succession of spacers occupying the inter-bar spaces.

[0048] According to one aspect of the invention, the succession of spacers occupies all the inter-bar spaces forming a column, in particular parallel to the axis of the axial flux electric machine.

[0049] These spacers make it possible to form inter-bar spaces between the bus bars in order to avoid electrical contact between them.

[0050] According to one aspect of the invention, the succession of spacers occupies only some of the inter-bar spaces and forms a column, in particular parallel to the axis of the axial flux rotating machine.

[0051] In other words, this column of spacers leaves at least one of the interbar spaces free.

[0052] According to one aspect of the invention, the spacers are arranged in two columns circumferentially offset from each other.

[0053] According to one aspect of the invention, the holding member comprises two spacer columns, each occupying only some of the inter-bar spaces, and these two columns are arranged circumferentially offset from each other.

[0054] According to one aspect of the invention, at least one of the spacers comprises at least one heat transfer fluid circulation orifice so as to allow the circulation of heat transfer fluid through this orifice.

[0055] According to one aspect of the invention, at least one of the bus bars comprises at least one heat transfer fluid circulation orifice so as to allow the circulation of heat transfer fluid through this orifice.

[0056] According to one aspect of the invention, the electrical connection assembly comprises a top portion extending perpendicularly from the external skirt of the hollow body.

[0057] According to one aspect of the invention, the top part has a general shape substantially of a trapezoidal prism.

[0058] According to one aspect of the invention, the top portion comprises a heat transfer fluid supply inlet.

[0059] According to one aspect of the invention, the heat transfer fluid supply inlet is configured to be oriented parallel to the axis of rotation on one of the faces of the top portion, said faces being oriented perpendicular to the axis of rotation.

[0060] According to one aspect of the invention, the heat transfer fluid supply inlet is on one of the faces of the top part, said faces being oriented perpendicular to the axis of rotation.

[0061] According to one aspect of the invention, the heat transfer fluid supply inlet is configured to be oriented parallel to the axis of rotation.

[0062] According to one aspect of the invention, the top part has a thickness, denoted L1, measured along the axis of rotation, which is smaller than the width of the hollow body, denoted L2, measured along the axis of rotation.

[0063] According to one aspect of the invention, the electrical connection assembly comprises a plurality of separation partitions arranged so that the heat transfer fluid follows a sinuous path to one of the groups of projection orifices, in particular to the second group of projection orifices of the annular wall.

[0064] According to one aspect of the invention, the bus bars are parallel to each other.

[0065] According to one aspect of the invention, the bus bars are arranged so that in cross-section, the busbar sections form three sides of a triangle.

[0066] According to one aspect of the invention, the bus bars are arranged so that in cross-section, the sections of the bus bars form a star.

[0067] According to one aspect of the invention, the bus bars have a substantially circular shape.

[0068] According to one aspect of the invention, the bus bars each comprise an electrical connection tab arranged to be connected to one of the electrical windings.

[0069] According to one aspect of the invention, these electrical connection tabs extend axially, parallel to the axis of rotation.

[0070] According to one aspect of the invention, the connecting tabs are distributed around the axis of rotation, with a regular pitch between them.

[0071] According to another aspect of the invention, the electrical connection assembly comprises at least one heat transfer fluid outlet arranged to cooperate with a heat transfer fluid inlet of the electrical insulator.

[0072] According to one aspect of the invention, the fluid outlet has a cylindrical shape.

[0073] According to one aspect of the invention, the electrical connection assembly comprises a plurality of heat transfer fluid outlets.

[0074] According to one aspect of the invention, the heat transfer fluid outlets are distributed around the axis of rotation, with a regular pitch between them.

[0075] According to one aspect of the invention, the heat transfer fluid outlets and the electrical connection tabs are arranged alternately around the axis of rotation.

[0076] According to one aspect of the invention, the hollow body has a cylindrical shape with an axis parallel to the axis of rotation.

[0077] According to one aspect of the invention, the hollow body has a cylindrical shape with an axis coincident with the axis of rotation.

[0078] According to one aspect of the invention, the outer skirt and the inner skirt are concentric, both cylindrical in shape with an axis parallel to the axis of rotation.

[0079] According to one aspect of the invention, the bus bar(s) are at least partially embedded in a resin, in particular between its internal and external skirts.

[0080] According to one aspect of the invention, the electrical connection tabs are left free, i.e. not embedded in the resin.

[0081] According to one aspect of the invention, the electrical connection assembly, in particular a single-piece assembly, comprises a compartment configured to receive the electrical output ends of the bus bars so as to allow electrical connection of these bus bars to an external electrical device.

[0082] “External electrical device” means a device arranged to provide electrical energy to the axial flux electric machine in motor operation or receive the electrical energy produced by the axial flux electric machine for generator operation

[0083] According to one aspect of the invention, the axial flux rotating electrical machine comprises a housing configured to form an enclosure in which the stator is placed.

[0084] According to one aspect of the invention, the housing is for example made of plastic.

[0085] According to one aspect of the invention, the housing comprises a central opening configured to allow passage of a rotating shaft linked to a rotor or several rotors of the axial flux electric machine.

[0086] According to one aspect of the invention, the housing and the electrical connection assembly are fixed together using fixing members such as screws.

[0087] According to one aspect of the invention, the electrical connection assembly is housed entirely within the enclosure of the housing.

[0088] According to one aspect of the invention, a cover is provided for closing the housing.

[0089] According to one aspect of the invention, this hood is generally flat, and extends per pendicularly to the axis of rotation.

[0090] According to one aspect of the invention, this cover is fixed to an annular end edge of the housing, in particular using fixing members such as screws.

[0091] According to one aspect of the invention, a seal, in particular an annular seal, is placed between this end of the housing and the cover.

[0092] According to one aspect of the invention, the sealing gasket is silicone-based.

[0093] According to one aspect of the invention, a rotor, housed in the housing, is arranged axially between the electrical connection assembly and this cover.

[0094] According to one aspect of the invention, the rotor is spaced from the stator along the axis of the axial flux rotating electrical machine, to define an air gap between the stator and the rotor.

[0095] According to one aspect of the invention, the axial flux rotating electrical machine comprises at least two rotors.

[0096] According to one aspect of the invention, the axial flux rotating electrical machine comprises two rotors placed on either side of the stator, axially facing this stator.

[0097] According to an independent aspect or in combination with the above, there is provided a rotating electrical machine, in particular with axial flux, having an axis of rotation, comprising:

[0098] - at least one rotor;

[0099] - at least one stator arranged face to face with said at least one rotor in a axial direction by forming an air gap, this stator being arranged in an enclosure, and comprising:

[0100] o a plurality of electrical windings which are inscribed between an inner contour and an outer contour;

[0101] o a plurality of teeth carrying the electrical windings;

[0102] o an electrical insulator interposed between each tooth and the corresponding electrical winding and the electrical insulator comprising an external face facing the enclosure and an internal face opposite the external face; and

[0103] - a distribution channel for a heat transfer fluid, in particular a di fluid electrical, this channel being formed at least partially by the internal face of the electrical insulator so that the heat transfer fluid circulating in the distribution channel can cool the stator.

[0104] “Air gap” means an area separating the rotor and the stator.

[0105] Thus, the heat transfer fluid distribution channel for cooling the stator is formed between the inner face of the electrical insulator and the tooth. In this way, the heat transfer fluid can circulate directly between the electrical insulator and the tooth of the stator. The use of an additional cooling circuit is thus avoided.

[0106] This makes it possible to optimize the evacuation of heat from the stator without excessively increasing the overall size of the rotating electrical machine, particularly at the stator level.

[0107] Furthermore, the manufacturing of the rotating electrical machine becomes simpler, because it is simpler to mold or manufacture the electrical insulator than the stator or rotor made of a harder material than the electrical insulator, for example iron.

[0108] Furthermore, the modification of the electrical insulator alone has the advantage of preserving the active material forming the stator or the rotor, and therefore of preserving the electromagnetic properties of the rotating electrical machine.

[0109] Furthermore, it may be advantageous to first assemble the electrical winding around the tooth outside the electrical machine and then attach this electrical winding to the teeth of the stator rather than assembling the electrical winding inside the electrical machine. The arrangement of the heat transfer fluid distribution channel between the electrical insulator and the teeth of the stator allows such an assembly.

[0110] According to one aspect of the invention, the axial flux rotating electrical machine comprises a housing configured to form an enclosure in which the stator is placed.

[0111] According to one aspect of the invention, the internal contours of the electrical winding are configured to be in contact with the external face of the electrical insulator and the external contours of the electrical winding are turned towards the enclosure.

[0112] According to one aspect of the invention, the enclosure is configured to surround the external contours of the electrical winding.

[0113] According to one aspect of the invention, the distribution channel communicates with the enclosure, by at least one projection orifice passing through an annular wall of the electrical insulator, this projection orifice being configured to project cooling fluid coming from the distribution channel into the enclosure.

[0114] The heat transfer fluid coming from the distribution channel can cool the electrical windings.

[0115] According to one aspect of the invention, the rotating electrical machine further comprises a flange facing the electrical insulator so as to form a distribution channel between the electrical insulator and the flange.

[0116] According to one aspect of the invention, the flange comprises a heat transfer fluid supply inlet for supplying the distribution channel.

[0117] According to one aspect of the invention, the electrical insulator partially covers one of the faces of a stator yoke of the stator so as to together form the distribution channel.

[0118] According to one aspect of the invention, the distribution channel matches the shape of the perimeter of the internal face of the electrical insulator.

[0119] According to one aspect of the invention, the rotating electrical machine is an axial flux electrical machine.

[0120] According to one aspect of the invention, the rotating electrical machine is a radial flux electrical machine.

[0121] According to one aspect of the invention, the stator comprises at least two electrical insulators having complementary shapes arranged to cooperate with each other.

[0122] According to one aspect of the invention, the successive electrical insulators have shapes that are complementary to each other.

[0123] According to one aspect of the invention, the successive complementary electrical insulators, when assembled together, have a flat surface around which the electrical windings can be carried.

[0124] According to one aspect of the invention, the electrical insulator has an L shape when viewed in section along a plane comprising the axis of rotation of the electrical machine.

[0125] According to one aspect of the invention, the distribution channel is configured to pass through in a direction perpendicular to the direction of assembly of the successive electrical insulators.

[0126] For example, the direction of assembly of the electrical insulators is oriented towards the stator body.

[0127] According to one aspect of the invention, the external electrical device is a battery pack.

[0128] According to one aspect of the invention, the electrical insulator is a polymer material, in particular a thermoplastic.

[0129] According to one aspect of the invention, the rotating electrical machine comprises an electrical connection assembly comprising: - a hollow body within which a heat transfer fluid circulation channel is defined.

[0130] According to one aspect of the invention, the hollow body is configured to house the bus bar such that this bus bar extends at least partially into the heat transfer fluid circulation channel.

[0131] According to one aspect of the invention, the electrical connection assembly comprises: - at least one bus bar arranged to make an electrical connection between an electrical winding of the electrical machine and an external electrical source.

[0132] According to one aspect of the invention, the heat transfer fluid circulation channel of the electrical connection assembly can be connected to the heat transfer fluid distribution channel formed at least partially by the internal face of the electrical insulator so that the heat transfer fluid circulating in the circulation channel and in the distribution channel can cool the stator.

[0133] According to one aspect of the invention, the rotating electrical machine comprises an electrical connection assembly comprising:

[0134] a hollow body within which a heat transfer fluid circulation channel is defined, said heat transfer fluid circulation channel of the electrical connection assembly being able to be connected to the heat transfer fluid distribution channel formed at least partially by the internal face of the electrical insulator so that the heat transfer fluid circulating in the circulation channel and in the distribution channel can cool the stator.

[0135] According to an independent aspect or in combination with the above, there is provided an assembly intended for an axial flux rotating electrical machine, in particular of the permanent magnet type, having an axis of rotation, said assembly comprising:

[0136] - a tooth around which an electrical winding is made;

[0137] - an electrical insulator between the electrical winding and the tooth;

[0138] - a flow channel for heat transfer fluid, in particular a dielectric fluid, this channel being formed at least partially between the electrical insulator and the electrical winding so that the heat transfer fluid can contribute to the exchange of heat between the electrical winding and the tooth.

[0139] Thus, the invention makes it possible to cool the electrical winding by direct contact with the heat transfer fluid. In other words, the heat transfer fluid circulating in the heat transfer fluid flow channel passes repeatedly over different faces of the electrical winding or the different faces of the tooth.

[0140] Therefore, the heat exchange surface of the electrical winding and the tooth towards the heat transfer fluid is optimized, despite the thickness of the electrical winding or the thickness of the tooth.

[0141] In this way, efficient heat transfer from the tooth and the electrical winding to the heat transfer fluid is ensured without further increasing the size of the assembly, in particular with a view to obtaining better overall cooling of the assembly.

[0142] According to one aspect of the invention, the electrical insulator comprises two plates, in particular flat plates, connected to each other by a plurality of side walls.

[0143] These flat plates as well as side walls of the electrical insulator are arranged so that the heat transfer fluid can touch them.

[0144] The heat transfer fluid touching these flat plates as well as the side walls of the electrical insulator can come from the heat transfer fluid circulation assembly, or from the distribution channel following the shape of the perimeter of the internal face of the electrical insulator, or from the combination of the two.

[0145] According to one aspect of the invention, the tooth comprises a bearing arranged to be aligned with one of the plates of the electrical insulator.

[0146] According to one aspect of the invention, the tooth comprises a female beveled wall and a male beveled wall, the female beveled wall being configured to cooperate with the male beveled wall of the tooth of a neighboring assembly.

[0147] According to one aspect of the invention, the tooth comprises at least two ears arranged symmetrically with respect to the plane parallel to the axis of rotation and passing through the middle of the tooth.

[0148] According to one aspect of the invention, the ears have rounded corners.

[0149] According to one aspect of the invention, the electrical insulator comprises a support provided of a front erected perpendicular to a foot of the electrical insulator so as to at least partially cover the ears of the tooth.

[0150] According to one aspect of the invention, the support of the electrical insulator further comprises a head erected from the front of the electrical insulator so as to form a flat between the head and the front.

[0151] According to one aspect of the invention, the electrical insulator forms a single piece.

[0152] According to one aspect of the invention, the electrical insulator is provided with at least one re receptacle arranged to receive a plurality of electrical windings.

[0153] According to one aspect of the invention, the receptacle comprises at least one cavity arranged to receive an electrical winding, this cavity comprising two ridges and a valley between these two ridges.

[0154] Thus, the valley between the two ridges forms a heat transfer fluid path arranged to maintain the electrical winding.

[0155] According to one aspect of the invention, the electrical insulator is provided with at least two receptacles arranged to receive a plurality of electrical windings.

[0156] According to one aspect of the invention, the two receptacles are symmetrical with respect to a plane passing through the middle of the tooth bearing.

[0157] According to one aspect of the invention, the heat transfer fluid flow channel is formed at least partially between the receptacles of the electrical insulator and the electrical winding so that the exchange of heat from the electrical winding and the tooth to the heat transfer fluid is optimal.

[0158] According to another aspect of the invention, the electrical insulator comprises a hollow body having a heat transfer fluid circuit connecting a heat transfer fluid inlet and a heat transfer fluid outlet.

[0159] The hollow body of the electrical insulator can be formed in particular by blow molding.

[0160] According to one aspect of the invention, the heat transfer fluid inlet of the electrical insulator of the assembly comprises a chamfer arranged to guide the heat transfer fluid outlets towards the heat transfer fluid circuit of the electrical insulator.

[0161] According to one aspect of the invention, the head of the electrical insulator support comprises the heat transfer fluid inlet.

[0162] Specific tolerances between the electrical insulator and the tooth may be provided to compensate for plastic deformation of the electrical insulator and the tooth. In this way the risk of leakage of the heat transfer fluid can be reduced.

[0163] According to one aspect of the invention, the electrical winding comprises rising parts arranged symmetrically with respect to the plane parallel to the axis of rotation and passing through the middle of the tooth.

[0164] The invention also relates to the axial flux rotating electrical machine having an axis of rotation comprising the assembly according to any one of the preceding claims.

[0165] According to one aspect of the invention, the heat transfer fluid is a cooling oil or a dielectric fluid.

[0166] The invention also relates to an electrical connection assembly comprising: - at least one bus bar arranged to make an electrical connection between an electrical winding of the electrical machine and an external electrical device; - a hollow body within which a heat transfer fluid circulation channel is defined; and this hollow body being configured to house the bus bar such that this bus bar extends at least partially into the fluid circulation channel ca- carrier.

[0167] The invention also relates to a module intended for an axial flux rotating electrical machine, said module comprising: - an assembly according to the invention configured to be connected to an electrical connection assembly according to the invention; and - the electrical connection assembly configured to be connected to the assembly.

[0168] The invention also relates to a rotating electrical machine comprising a module according to the invention.

[0169] According to one aspect of the invention, the rotating electrical machine is an axial flux rotating electrical machine.

[0170] According to one aspect of the invention, the axial flux rotating electrical machine comprises a rotor and at least two stators.

[0171] The invention also relates to a method for manufacturing an assembly according to the invention, said method comprising the following steps: - wrap an electrical coil around a tooth; - provide electrical insulation between the electrical winding and the tooth; - form a heat transfer fluid flow channel at least partially between the electrical insulator and the electrical winding so that the heat transfer fluid can contribute to the exchange of heat from the electrical winding and the tooth to the heat transfer fluid.

[0172] According to one aspect of the invention, the electrical insulator is shaped by molding or by blowing.

[0173] The invention also relates to a method of manufacturing a module according to the invention, said method comprising the following steps: - providing an electrical connection assembly according to the invention further comprising at least one heat transfer fluid outlet arranged to be connected with a heat transfer fluid inlet of the electrical insulation of the assembly; - providing an assembly according to the invention comprising the heat transfer fluid inlet configured to be connected with the heat transfer fluid outlet of the electrical connection assembly; and - insert the heat transfer fluid outlet of the electrical connection assembly into the heat transfer fluid inlet of the assembly so as to form the module.

[0174] According to one aspect of the invention, the insertion of the heat transfer fluid outlet of the electrical connection assembly into the heat transfer fluid inlet of the assembly is done in the direction parallel to the axis of rotation of the electrical connection assembly.

[0175] According to one aspect of the invention, the method further comprises a step of fixing the electrical connection assembly to the assembly.

[0176] According to one aspect of the invention, the fixing step is carried out by welding.

[0177] According to one aspect of the invention, the axis of rotation of the electric machine rotating, especially axial flow or radial flow, can be confused with the axis of rotation of the electrical connection assembly.

[0178] Other characteristics and advantages of the present invention will appear more clearly on reading the following description, provided for illustrative and non-limiting purposes, and the appended drawings in which:

[0179] [Fig-1] [Fig.l] illustrates, schematically and partially, in perspective, a rotating electrical machine according to an exemplary implementation of the invention;

[0180] [Fig.2] [Fig.2] illustrates, schematically and partially, in perspective, the rotating electric machine of [Fig.l], without the casing;

[0181] [Fig.3] [Fig.3] illustrates, schematically and partially, a set of electrical connection of the rotating electrical machine of [Fig.2];

[0182] [Fig.4] [Fig.4] illustrates, schematically and partially, the whole of connection of the rotating electrical machine according to one embodiment of the invention;

[0183] [Fig.5] [Fig.5] illustrates, schematically and partially, the whole of connection of the rotating electrical machine according to another embodiment of the invention;

[0184] [Fig.6] [Fig.6] illustrates, schematically and partially, the whole of connection of the rotating electrical machine according to another embodiment of the invention;

[0185] [Fig.7] [Fig.7] illustrates, schematically and partially, the whole of connection of the rotating electrical machine according to another embodiment of the invention;

[0186] [Fig.8] [Fig.8] illustrates, in perspective, a sectional view of the connection assembly of the rotating electric machine of [Fig.7];

[0187] [Fig.9] [Fig.9] represents the connection assembly of the electric machine rotating according to another embodiment of the invention;

[0188] [Fig. 10] [Fig. 10] represents the connection assembly of the rotating electrical machine according to another embodiment of the invention;

[0189] [Fig. 11] [Fig. 11] illustrates, in perspective and exploded view, a schematic representation of a rotating electrical machine according to an exemplary implementation of the invention;

[0190] [Fig. 12] [Fig. 12] illustrates, in perspective, a sectional view of the rotating electrical machine according to one embodiment of the invention;

[0191] [Fig. 13] [Fig. 13] illustrates, in perspective, a sectional view of the rotating electrical machine according to another embodiment of the invention;

[0192] [Fig. 14] [Fig. 14] illustrates, in perspective, a sectional view of the rotating electrical machine according to another embodiment of the invention;

[0193] [Fig. 15] [Fig. 15] illustrates, in perspective and exploded view, the rotating electrical machine of [Fig. 14];

[0194] [Fig. 16] [Fig. 16] illustrates, in perspective, a top view of the electrical insulator according to an exemplary implementation of the invention, highlighting the distribution channel;

[0195] [Fig. 17] [Fig. 17] illustrates, in perspective, a partial view of the rotating electrical machine according to an exemplary implementation of the invention illustrating the distribution channel of [Fig. 16];

[0196] [Fig. 18] [Fig. 18] illustrates a sectional view of the rotating electrical machine according to another embodiment of the invention, the rotating electrical machine comprising the electrical connection assembly of Figures 7 and 8;

[0197] [Fig. 19] [Fig. 19] illustrates, schematically and partially, a sectional view of the rotating electrical machine according to another embodiment;

[0198] [Fig.20] [Fig.20] illustrates, schematically and partially, in perspective, a sectional view of an assembly intended for a rotating electrical machine according to an exemplary implementation of the invention;

[0199] [Fig.21] [Fig.21] illustrates, schematically and partially, in perspective, a top view of the assembly according to an embodiment without the electrical windings;

[0200] [Fig.22] [Fig.22] illustrates, schematically and partially, in perspective, the assembly according to an embodiment without the electrical windings;

[0201] [Fig.23] [Fig.23] illustrates, schematically and partially, in perspective, a sectional view of an electrical connection assembly according to an embodiment adapted to be connected to the assembly of the invention;

[0202] [Fig.24] [Fig.24] illustrates, schematically and partially, in perspective, a front view of an example of the assembly according to an implementation of the invention without the electrical windings and without the rising parts, the assembly being configured to be connected to the connection assembly of [Fig.23];

[0203] [Fig.25] [Fig.25] illustrates, schematically and partially, in perspective, the electrical connection assembly of [Fig.23] cooperating with the assembly of [Fig.24];

[0204] [Fig.26] [Fig.26] illustrates, schematically and partially, a flowchart of a manufacturing process for an assembly according to an exemplary implementation of the invention;

[0205] [Fig.27] [Fig.27] illustrates, schematically and partially, an organizational chart of method of manufacturing a module according to an exemplary implementation of the invention.

[0206] The features, variants and different embodiments of the invention may be combined with each other, in various combinations, provided that they are not incompatible or mutually exclusive. In particular, variants of the invention may be imagined comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the state of the prior art.

[0207] There is shown, with reference in particular to Figures 1 to 3, an axial flux rotating electrical machine of the permanent magnet type 2, having an axis of rotation X and comprising a stator 4 and two rotors 6 arranged face to face with the stator, in the axial direction (a rotor not being visible in Figures 1 and 2).

[0208] This machine 2 comprises an electrical connection assembly 8 comprising: - bus bars 10 arranged to make electrical connections 12 between electrical windings 14 of the electrical machine 2 and an external electrical device (not shown), for example a battery pack or power converters; and - a hollow body 16 within which a heat transfer fluid circulation channel 18 is defined.

[0209] As is particularly visible in [Fig.3], this hollow body 16 is configured to house the bus bars 10 so that these bus bars 10 extend at least partially into the heat transfer fluid circulation channel 18.

[0210] Thanks to the invention, the heat transfer fluid circulation channel 18 is located within the electrical connection assembly 8 itself. In this way, better compactness of the axial flux electrical machine 2 can be obtained.

[0211] Referring in particular to Figures 3 to 6, the heat transfer fluid 19 circulating in the circulation channel 8 may be in direct contact with the bus bars 10, axially aligned with an axial spacing between the bus bars. Thus, the bus bars 10 can be cooled directly and efficiently in order to optimize the heat exchange between the bus bars 10 and the heat transfer fluid 19.

[0212] Furthermore, the direct contact between the heat transfer fluid 19 and the bus bars 10 makes it possible to reduce the quantity of conductive material forming the bus bars 10 compared to the case where the contact would not be direct between the heat transfer fluid 19 and the bus bars 10. Therefore, the manufacturing cost of the electrical connection assembly 8 can be reduced.

[0213] As can be seen in particular in [Fig.l], the rotating flux electric machine axial 2 comprises a housing 20, for example made of plastic, and configured to form an enclosure (not shown for the sake of simplicity) in which the stator 4 is placed.

[0214] In all the illustrated examples which follow, the axis of rotation X of the axial flux rotating electrical machine 2 coincides with the axis of rotation X of the electrical connection assembly 8.

[0215] The electrical connection assembly 8 is housed entirely within the enclosure of the housing 20.

[0216] The housing 20 comprises a central opening 21 configured to allow a rotary shaft 24 connected to a rotor 6 or several rotors 6 of the axial flux electric machine 2 to pass therethrough.

[0217] As can be seen in particular in [Fig.2], the housing 20 and the electrical connection assembly 8 are fixed together using fixing members such as screws 26.

[0218] As is particularly visible in Figures 1 and 2, a cover 30 is provided to close the housing 20. This cover is generally flat, and extends perpendicular to the axis of rotation. This cover 30 is fixed to an annular end edge 32 of the housing 20, in particular using fixing members such as screws 26.

[0219] A sealing gasket (not shown), for example silicone-based, and annular, is placed between this end of the housing 20 and the cover 30.

[0220] Another rotor, housed in the housing 20, is arranged axially between the electrical connection assembly 8 and this cover 30.

[0221] As can be seen in [Fig.2] representing a single rotor 6 for the sake of simplicity, the rotor 6 is spaced from the stator 4 along the axis of the axial flux rotating electrical machine 2, to define an air gap 34 between the stator 4 and the rotor 6.

[0222] It can be seen in particular in Figures 1 to 3 and 23, 25 that the electrical connection assembly 8 comprises a heat transfer fluid supply inlet 36 having a cylindrical shape.

[0223] Referring in particular to Figures 3 to 6 and 8 to 10, it can be seen that the electrical connection assembly 8 comprises three or four bus bars 10 having the same diameters.

[0224] Among the four bus bars 10, the three bus bars 10 are associated with three different phases (not shown).

[0225] The fourth bus bar 10 forms an electrical neutral.

[0226] The hollow body 16, made of plastic material, by molding, of the electrical connection assembly 8 is made of a single piece.

[0227] The hollow body 16 has a cylindrical shape with an axis parallel to the axis of rotation X.

[0228] As can be seen in Figures 1 and 2, the electrical connection assembly 8, of a single piece, comprises a compartment 44 configured to receive the electrical output ends (not shown) of the bus bars 10 so as to allow an electrical connection 12 of these bus bars 10 to an external electrical device, (not shown)

[0229] The term "external electrical device" (not shown) means a device arranged to supply electrical energy to the axial flux electric machine 2 in motor operation or to receive electrical energy from the axial flux electric machine 2 for generator operation.

[0230] The invention makes it possible to facilitate the construction of the axial flux electric machine 2, since a reduced number of parts is used, including the aforementioned hollow body 16, made from a single piece.

[0231] The hollow body 16 comprises an internal skirt 50 configured to be oriented towards the center of the axis of rotation X and an external skirt 52 connected to the internal skirt 50 by two annular walls 54 of the electrical connection assembly 8, these annular walls being opposite each other.

[0232] As illustrated in [Fig.3], the inner skirt 50 is located on a face oriented opposite to the outer skirt 52. The inner 50 and outer 52 skirts are parallel to each other.

[0233] As illustrated in [Fig.3], the bus bar(s) 10 are at least partially embedded in a resin 61, in particular between its internal 50 and external 52 skirts.

[0234] [Fig. 3] makes it particularly visible that the hollow body 16 comprises groups of projection orifices 40, 42 arranged to cool the electrical windings 14.

[0235] The internal skirt 50 of the electrical connection assembly 8 comprises the group of projection orifices 40 arranged to cool the electrical windings 14 called the first group of projection orifices 40.

[0236] One of the annular walls 54 of the hollow body 8 comprises the second group of projection orifices 42, configured to project heat transfer fluid parallel to the axis of rotation X of the axial flux rotating electrical machine.

[0237] The orifices of the second group of projection orifices 42 are arranged all around the annular wall 54 of the hollow body 16, with a regular pitch between them.

[0238] The outer skirt 52 and the inner skirt 50 are concentric, both of cylindrical shape with an axis parallel to the axis of rotation X.

[0239] It can be seen in particular in Figures 4 to 6 that the electrical connection assembly 8 comprises a holding member 60 configured to hold the bus bars 10 in position in the channel 18.

[0240] The holding member 60 comprises a plurality of spacers 62, each being inserted between two neighboring bus bars 10 spaced apart with an inter-bar space 64.

[0241] The holding member comprises a succession of spacers 62 occupying the inter-bar spaces 64.

[0242] As can be seen in particular in [Fig.4], the succession of spacers 62 occupies all the inter-bar spaces 64 and forms a column parallel to the axis of the axial flux electric machine 2.

[0243] These spacers 62 make it possible to form inter-bar spaces 64 between the bus bars 10 in order to avoid electrical contact between them.

[0244] As can be seen in particular in Figures 5 and 6, the succession of spacers 62 occupies only some of the inter-bar spaces 64 and forms a column parallel to the axis of the axial flux rotating machine 2.

[0245] In other words, this column of spacers 62 leaves at least one of the inter-bar spaces 64 free.

[0246] Still in the examples of figures 5 and 6, the spacers 62 are arranged in two columns circumferentially offset from one another.

[0247] In these examples, the holding member 60 comprises two spacer columns 62, each occupying only some of the inter-bar spaces 64, and these two columns are arranged circumferentially offset from each other.

[0248] As is particularly visible in [Fig.6], the bus bars 10 comprise heat transfer fluid circulation orifices 70 so as to allow the circulation of heat transfer fluid through these orifices.

[0249] For all examples of the invention, the bus bars 10 may include these fluid circulation orifices 70.

[0250] As can be seen in particular in Figures 5 and 6 and 23 and 25, the bus bars 10 each comprise an electrical connection tab 72 arranged to be connected to one of the electrical windings 14.

[0251] These electrical connection tabs 72 extend axially, parallel to the axis of rotation X.

[0252] The connecting tabs 72 are distributed around the rotation axis X, with a regular pitch between them.

[0253] As shown in Figures 7 and 8, the electrical connection assembly 8 comprises a top portion 74, having a general shape substantially of a trapezoidal prism, and extending perpendicularly from the external skirt 52 of the hollow body 16.

[0254] The top portion 74 comprises a heat transfer fluid supply inlet 36.

[0255] The heat transfer fluid supply inlet 36 is on one of the faces of the top part 76, said faces 76 being oriented perpendicular to the axis of rotation X.

[0256] The heat transfer fluid supply inlet 36 is configured to be oriented parallel to the axis of rotation X.

[0257] The top portion 76 has a thickness, denoted L1, measured along the rotation axis X, which is smaller than the width of the hollow body 16, denoted L2, measured along the rotation axis X.

[0258] Still in the example of [Fig.8], the electrical connection assembly 8 comprises a plurality of separation partitions 80 arranged so that the heat transfer fluid 19 follows a sinuous path to the second group of projection orifices 52 of the annular wall 54. The bus bars 10 are substantially circular or are in the form of rings so that they are nested relative to each other with a radial spacing between the bus bars 10.

[0259] In this example of [Fig.8], the bus bars 10 are parallel to each other.

[0260] In the example illustrated in [Fig.9], the bus bars 10 are arranged so that in cross-section, the sections of the bus bars 10 form three sides of a triangle.

[0261] In the example illustrated in [Fig. 10], the bus bars are arranged so that in cross-section, the sections of the bus bars 10 form a star.

[0262] A rotating electrical machine 2 in accordance with the invention will now be described in more detail, in particular with reference to FIGS. 11 to 18.

[0263] The axial flux rotating electrical machine 2, having an axis of rotation X, comprises:

[0264] - a rotor (not shown in these figures, but visible in [Fig.2]);

[0265] - a stator 4 arranged face to face with the rotor 6 in an axial direction, forming an air gap 34.

[0266] The term “air gap” 34 means an area separating the rotor and the stator 4.

[0267] This stator 4 arranged in an enclosure 17, comprises:

[0268] o a plurality of electrical windings 14 which are inscribed between an internal contour 80 and an external contour 81;

[0269] o a plurality of teeth 51 carrying the electrical windings 14;

[0270] o an electrical insulator 82, a thermoplastic, interposed between each tooth 51 and the corresponding electrical winding 14 and the electrical insulator 82 comprising an external face 84 facing the enclosure 17 and an internal face 86 opposite the external face 84.

[0271] The axial flux electrical machine 2 comprises a distribution channel 90 for a heat transfer fluid, this channel 90 being formed at least partially by the internal face 86 of the electrical insulator 82 so that the heat transfer fluid 19 circulating in the distribution channel can cool the stator 4.

[0272] Thus, the heat transfer fluid distribution channel 90 for cooling the stator 4 is formed between the internal face 86 of the electrical insulator 82 and the tooth 51. In this way, the heat transfer fluid 19 can circulate directly between the electrical insulator 82 and the tooth 51 of the stator 4. The use of an additional cooling circuit is thus avoided.

[0273] This makes it possible to optimize the evacuation of heat from the stator 4 without excessively increasing the overall size of the rotating electrical machine 2, in particular at the level of the stator 4.

[0274] Furthermore, the manufacture of the rotating electrical machine 2 becomes simpler, because it is simpler to machine the electrical insulator 82 than the stator 4 or the rotor made of a harder material than the electrical insulator, for example iron.

[0275] In addition, the machining of the electrical insulator 82 has the advantage of preserving the active material forming the stator 4 or the rotor, and therefore of preserving the electromagnetic properties of the rotating electrical machine 2.

[0276] Furthermore, it is simpler to first assemble the electrical winding 14 around the electrical insulator 82 outside the electrical machine 2, then to attach this electrical winding 14 to the teeth 51 of the stator 4 rather than assembling the electrical winding inside the electrical machine 2. The arrangement of the heat transfer fluid distribution channel 90 between the electrical insulator 82 and the teeth of the stator 4 allows such an assembly.

[0277] The internal contours 80 of the electrical winding 14 are configured to be in contact with the external face 84 of the electrical insulator 82 and the external contours 81 of the electrical winding are turned towards the enclosure 17.

[0278] The axial flux rotating electrical machine 2 comprises a housing (not shown) configured to form an enclosure 17 in which the stator 4 is placed.

[0279] The enclosure 17 is configured to surround the external contours 81 of the electrical winding 14.

[0280] As can be seen in Figures 13 and 14, the distribution channel 90 communicates with the enclosure 17, by projection orifices 140 passing through an annular wall 83 of the electrical insulator 82, these projection orifices being configured to project cooling fluid 19 coming from the distribution channel 90 into the enclosure 17.

[0281] The heat transfer fluid 19 coming from the distribution channel 90 can cool the electrical windings 14.

[0282] With reference in particular to figures 12, 13 and 15, the rotating electrical machine 2 further comprises a flange 100 facing the electrical insulator 82 so as to form a distribution channel 90 between the electrical insulator 82 and the flange 100.

[0283] As particularly illustrated in [Fig. 15], the flange 100 comprises a heat transfer fluid supply inlet 36 for supplying the distribution channel 90.

[0284] As can be seen in particular in [Fig. 14], the electrical insulator 82 partially covers one of the faces of a stator yoke 102 of the stator 4 so as to form the distribution channel together.

[0285] With reference to figures 16 and 17, the distribution channel 90 matches the shape of the periphery 104 of the internal face 86 of the electrical insulator 82.

[0286] As shown in [Fig. 18], the heat transfer fluid circulation channel 18 of the electrical connection assembly 8 can be connected to the heat transfer fluid distribution channel 90 formed at least partially by the internal face 86 of the electrical insulator 82 so that the heat transfer fluid 19 circulating in the circulation channel 18 and in the distribution channel 90 can cool the stator 4.

[0287] With particular reference to [Fig. 19], the stator 4 comprises a plurality of successive electrical insulators 82 having complementary shapes arranged to cooperate with each other.

[0288] The successive complementary electrical insulators 82, when assembled together, have a flat surface 110 around which the electrical windings 14 can be carried.

[0289] The electrical insulators 82 have an L shape when viewed in section along a plane comprising the axis of rotation X of the electrical machine 2.

[0290] The distribution channel 90 is configured to pass through in a direction perpendicular to the assembly direction 112 of the successive electrical insulators oriented towards the body 114 of the stator 4.

[0291] Now we will describe with reference in particular to figures 20-22, an assembly 200 intended for a rotating electrical machine with axial flux of the permanent magnet type 2, having an axis of rotation X.

[0292] The assembly 200 comprises:

[0293] - a tooth 51 around which an electrical winding 14 is made;

[0294] - an electrical insulator 82 between the electrical winding 14 and the tooth 51;

[0295] - a heat transfer fluid flow channel 210, this channel 210 being formed at least partially between the electrical insulator 82 and the electrical winding 14 so that the heat transfer fluid 19 can contribute to the exchange of heat generated by the electrical winding 14 and the tooth 51.

[0296] Thus, the invention makes it possible to cool the electrical winding 14 by direct contact with the heat transfer fluid. In other words, the heat transfer fluid 19 circulating in the heat transfer fluid flow channel 210 passes several times over different faces of the electrical winding 14 or different faces of the tooth 51.

[0297] Therefore, the heat exchange surface of the electrical winding 14 and the tooth 51 to the heat transfer fluid 19 is optimized, despite the thickness of the electrical winding 14 or the thickness of the tooth 51.

[0298] In this way, efficient heat transfer from the electrical winding 14 and the tooth 51 to the heat transfer fluid 19 is ensured without further increasing the size of the assembly 200, in particular with a view to obtaining better overall cooling of the assembly 200.

[0299] As can be seen in particular in Figures 21 and 22, the electrical insulator 82 comprises two flat plates 218 which are connected to each other by a plurality of side walls 220.

[0300] These flat plates 218 as well as side walls 220 of the electrical insulator 82 are arranged so that the heat transfer fluid 216 can come and touch them.

[0301] The heat transfer fluid touching these flat plates 218 as well as the side walls 220 of the electrical insulator 82 can come from the heat transfer fluid circulation assembly 8 ([Fig.23]), or from the distribution channel 90 following the shape of the periphery 104 of the internal face 86 of the electrical insulator 82 ([Fig. 17]), or from the combination of the two ([Fig. 18]).

[0302] Tooth 51 includes a bearing 222 arranged to be aligned with one of the plates of the electrical insulator.

[0303] The tooth 51 comprises a female beveled wall 230 and a male beveled wall 232, the female beveled wall 230 being configured to cooperate with the male beveled wall 232 of the tooth 51 of a neighboring assembly 200.

[0304] With reference to Figures 20 to 22, the electrical insulator 82 is provided with two receptacles 240 arranged to receive a plurality of electrical windings 14.

[0305] Referring in particular to figures 21 and 22, the receptacles 240 comprise a plurality of cavities 250 each arranged to receive an electrical winding 14, this cavity 250 comprising two ridges 252 and a valley 254 between these two ridges 252.

[0306] Thus, the valley 254 between the two ridges 252 forms a heat transfer fluid path arranged to maintain the electrical winding 14.

[0307] The two receptacles 240 are symmetrical with respect to a plane (P) passing through the middle of the bearing 222 of the tooth 51.

[0308] The heat transfer fluid flow channel is formed at least partially between the receptacles 240 of the electrical insulator 82 and the electrical winding 14 so that

[0309] the exchange of heat from the electrical winding 14 and the tooth 51 to the heat transfer fluid 19 is optimal.

[0310] In the example illustrated in [Fig.23], the electrical connection assembly 8 comprises a plurality of heat transfer fluid outlets 260, having cylindrical shapes, and each arranged to cooperate with a heat transfer fluid inlet. 262 of electrical insulation 82.

[0311] The heat transfer fluid outlets 260 are distributed around the rotation axis X, with a regular pitch between them.

[0312] Still in the example of [Fig.23], the heat transfer fluid outlets 260 and the electrical connection tabs 72 are arranged alternately around the rotation axis X.

[0313] The electrical connection tabs 72 are left free, i.e. not embedded in the resin 61.

[0314] As can be seen in particular in [Fig.24], the tooth 51 has two ears 264 having rounded corners arranged symmetrically with respect to the plane parallel to the axis of rotation X and passing through the middle of the tooth 51.

[0315] The electrical insulator 82 comprises a support 266 provided with a front 268 erected perpendicular to a foot 270 of the electrical insulator 82 so as to at least partially cover the ears 264 of the tooth 51.

[0316] The support 266 of the electrical insulator 82 further comprises a head 272 erected from the front 273 of the electrical insulator 82 so as to form a flat 274 between the head 272 and the front 273.

[0317] The electrical insulator 82 comprises a hollow body 275 having a heat transfer fluid circuit 276 connecting a heat transfer fluid inlet 262 and a heat transfer fluid outlet 277.

[0318] The hollow body 275 of the electrical insulator 82 may be formed in particular by blow molding.

[0319] The head 272 of the support 266 of the electrical insulator 82 comprises the heat transfer fluid inlet 262.

[0320] The heat transfer fluid inlet 262 of the electrical insulator 82 of the assembly 200 comprises a chamfer 280 arranged to guide the heat transfer fluid outlets 260 towards the heat transfer fluid circuit 276 of the electrical insulator 82.

[0321] Specific tolerances between the electrical insulator and the tooth may be provided to compensate for plastic deformation of the electrical insulator 82 and the tooth 51. In this way the risk of leaks of the heat transfer fluid can be reduced.

[0322] We can notably see with reference to [Fig.25] a module 290 intended for an axial flux rotating electrical machine 2.

[0323] Module 290 includes: - an assembly 200 configured to be connected to an electrical connection assembly 8; and - the electrical connection assembly 8 configured to be connected to the assembly 200.

[0324] As illustrated in [Fig.25], the electrical winding 14 has parts

[0325]

[0326]

[0327]

[0328]

[0329] rising 280 arranged symmetrically with respect to the plane parallel to the axis of rotation X and passing through the middle of the tooth 51. For the examples described above, the heat transfer fluid is a cooling oil or a dielectric fluid. [Fig.26] illustrates a manufacturing method 300 of an assembly according to the invention, said method 300 comprising the following steps: - winding an electrical winding 14 around a tooth 51 (step 310); - provide an electrical insulator 82 between the electrical winding 14 and the tooth 51 (step 320); - forming a heat transfer fluid flow channel 18 at least partially between the electrical insulator 82 and the electrical winding 14 so that the heat transfer fluid can contribute to the exchange of heat from the electrical winding 14 and the tooth 51 to the heat transfer fluid 19. [Fig.27] illustrates a method of manufacturing a module 290 according to the invention 400, said method 400 comprising the following steps: - providing an electrical connection assembly 8 further comprising at least one heat transfer fluid outlet 260 arranged to be connected with a heat transfer fluid inlet 262 of the electrical insulator 82 of the assembly 200 (step 410); - providing an assembly 200 comprising the heat transfer fluid inlet 262 configured to be connected with the heat transfer fluid outlet 260 of the electrical connection assembly 8 (step 420); and - insert the heat transfer fluid outlet 260 of the electrical connection assembly 200 into the heat transfer fluid inlet 262 of the assembly 200 so as to form the module (step 430). The insertion of the heat transfer fluid outlet of the electrical connection assembly into the heat transfer fluid inlet of the assembly is carried out in the direction 292 parallel to the axis of rotation X of the electrical connection assembly 8. The method further comprises a step of attaching the electrical connection assembly to the assembly (step 440). In this step 440, the fixing is done by welding.

Claims

Claims

1. Axial flux rotating electrical machine (2), in particular of the permanent magnet type, having an axis of rotation (X) and comprising at least one stator (4) and at least one rotor (6) arranged face to face with the stator (4), in the axial direction, this machine comprising an electrical connection assembly (8) comprising: - at least one bus bar (10) arranged to make an electrical connection (12) between at least one electrical winding (14) of the electrical machine (2) and an external electrical device; and - a hollow body (16) within which a heat transfer fluid circulation channel (18) is defined; and this hollow body (16) being configured to house the at least one bus bar (10) so that this bus bar (10) extends at least partially into the heat transfer fluid circulation channel (18).

2. An axial flux rotating electrical machine (2) according to claim 1, wherein the electrical connection assembly (8) comprises a holding member (60) configured to hold the at least one bus bar (10) in position in the channel (18).

3. An axial flux rotating electrical machine (2) according to claim 2, wherein the holding member (60) comprises a plurality of spacers (62), each being inserted between two neighboring bus bars (10) spaced apart with an inter-bar gap (64).

4. Axial flux rotating electrical machine (2) according to the preceding claim, in which the holding member (60) comprises a succession of spacers (62) occupying the inter-bar spaces (64).

5. Axial flux rotating electrical machine (2) according to claim 4, in which the succession of spacers (62) occupies all the inter-bar spaces (64) and forms a column, in particular parallel to the axis of the axial flux electrical machine (2).

6. Axial flux rotating electrical machine (2) according to claim 4, in which the succession of spacers (62) occupies only some of the inter-bar spaces (64) and forms a column, in particular parallel to the axis (X) of the machine (2).

7. Axial flux rotating electric machine (2) according to one of the claims- indications 3 to 6, wherein at least one of the spacers (62) comprises at least one heat transfer fluid circulation orifice so as to allow the circulation of heat transfer fluid through this orifice.

8. An axial flux rotating electrical machine (2) according to any preceding claim, wherein at least one of the bus bars (10) comprises at least one heat transfer fluid circulation orifice (70) so as to allow the circulation of heat transfer fluid through this orifice (70).

9. A rotating axial flux electrical machine (2) according to any one of the preceding claims, the hollow body (16) comprises at least one group of projection orifices arranged to cool hot elements of the electrical machine (2), for example the electrical windings (14).

10. Axial flux rotating electrical machine (2) according to any one of the preceding claims comprising an assembly (200) comprising: - a tooth (51) around which an electrical winding (14) is formed; - an electrical insulator (82) between the electrical winding (14) and the tooth (51); - a flow channel for heat transfer fluid (210), in particular a dielectric fluid (19), this channel (210) being formed at least partially between the electrical insulator (82) and the electrical winding (14) so ​​that the heat transfer fluid (19) can contribute to the exchange of the heat generated by the electrical winding (14) and the tooth (51).

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