Stator of an electric axial flux machine

Abstract

The invention relates to a stator of an electric axial flux machine, wherein the electric axial flux machine has an axis of rotation (X), wherein the stator comprises the following: - a plurality of electrical windings (10), - a plurality of teeth (11), each carrying one of the electrical windings (10), - a multifunctional support (12) or connecting support designed to carry the plurality of teeth (11), and wherein this multifunctional support is provided with conductors (14) for electrical connection, which are designed for connection to the electrical windings (10).

Description

[0001] The present invention relates to a stator of an electric axial flux machine and such an electric axial flux machine, which is designed in particular to participate in driving an electric vehicle.

[0002] Patent application WO2016113567 discloses an axial flux machine comprising a stator with a stator housing enclosing several stator windings arranged circumferentially around a rotational axis of the axial flux machine. The axial flux machine also has two rotors, each comprising a group of permanent magnets, and these rotors are rotatably mounted about the rotational axis of the axial flux machine. Each rotor is spaced apart from the stator along the machine axis, thus defining an air gap between the stator and each rotor. The rotors are arranged on one side and the other side of the stator windings. The magnetic flux in the machine is generally oriented axially within the air gap.

[0003] The invention aims in particular to improve the work steps for assembling the teeth of a stator during manufacturing and also their mounting on the electric axial flux machine during the running time of the electric axial flux machine.

[0004] The invention thus relates to a stator of an electric axial flux machine, wherein the electric axial flux machine has an axis of rotation and the stator comprises the following: - several electrical windings, - several teeth, each carrying one of the electrical windings, - a multi-functional carrier or connecting carrier designed to support the multiple teeth, wherein this multi-functional carrier is provided with conductors for electrical connection which are set up for connection with the electrical windings.

[0005] This multifunctional carrier according to the invention makes it possible to reduce the number of parts required for the manufacture of the electric axial flux machine. This simplifies the manufacturing process and allows for better management of the machine's footprint. Furthermore, the multifunctional carrier ensures a secure hold for the teeth during machine manufacturing and throughout the machine's operation.

[0006] The windings on the teeth together form a coil of the stator, for example of the three-phase type.

[0007] According to one aspect of the invention, the multifunctional carrier comprises several seats, each of which has a tooth supported.

[0008] According to one aspect of the invention, the tooth seats are arranged around the axis of rotation, in particular in a uniform manner.

[0009] According to one aspect of the invention, each of the multiple teeth is one-piece, i.e., it consists of a single piece.

[0010] According to one aspect of the invention, each seat is limited by two radial legs of the multifunctional carrier.

[0011] According to one aspect of the invention, each tooth is arranged circumferentially between two adjacent radial legs.

[0012] According to one aspect of the invention, each tooth has a core around which the winding is formed and which extends along the axis of rotation, and has at each of its axial ends an end section which extends transversely to the core.

[0013] According to one aspect of the invention, each end section with the core essentially defines a T-shape. The end section serves for the mechanical fastening of the tooth to the multifunctional carrier or to a stator housing.

[0014] According to one aspect of the invention, each end section has an outer main surface which is generally flat and oriented opposite to the core.

[0015] According to one aspect of the invention, this outer main surface extends perpendicular to the axis of rotation of the electric axial flux machine.

[0016] According to one aspect of the invention, the end section of the tooth extends at least partially into a circumferential space between two adjacent radial legs of the multifunctional carrier.

[0017] This allows the tooth to move axially closer to the adjacent rotor, thereby reducing the air gap between the stator and rotor.

[0018] This improves the electromechanical performance of the machine.

[0019] According to one aspect of the invention, the end section of the tooth traverses the circumferential space, terminating essentially flush with the radial legs on the side of the air gap.

[0020] Thus, the radial legs of the multifunctional carrier do not project axially beyond the end sections of the teeth on the side of the air gap, and the outer main surface of the end section of the tooth essentially extends along the radial legs. In a further embodiment of the invention, the radial legs of the multifunctional carrier are set back axially relative to the end sections of the teeth. In other words, the end sections of the teeth project axially further into the gap than the radial legs of the multifunctional carrier.

[0021] According to one aspect of the invention, the radial legs of the seat of the multi-function carrier are flat and extend in particular perpendicular to the axis of rotation.

[0022] According to one aspect of the invention, the legs extend in a straight line in a radial direction.

[0023] According to another aspect of the invention, one of the radial legs is provided with a reinforcing rib. Thus, this radial leg can, for example, have a T-shape in cross-section. This shape enables an increase in the stiffness of the radial legs.

[0024] According to one aspect of the invention, the multifunctional carrier has a central hub and an outer ring, and the radial legs defining the seats extend radially between this central hub and the outer ring.

[0025] According to one aspect of the invention, the central hub has a central opening designed to allow a rotating shaft connected to one or more rotors of the electric axial flux machine to pass through it.

[0026] According to one aspect of the invention, the outer ring comprises a cylindrical outer shell with an axis parallel to the axis of rotation.

[0027] According to one aspect of the invention, the outer ring comprises a cylindrical inner shell with an axis parallel to the axis of rotation.

[0028] According to one aspect of the invention, the inner and outer shells run parallel to each other and are connected to each other by a circumferential flat strip, so that the outer ring has a U-shaped cross-section.

[0029] According to one aspect of the invention, the electrical conductors of the multifunctional carrier, to which the windings are connected, are arranged between the inner sheath and the outer sheath of the outer ring.

[0030] According to one aspect of the invention, the radial legs are connected to the inner mantle of the outer ring.

[0031] Thus, the radial legs extend between the central hub and this inner shell of the outer ring.

[0032] According to one aspect of the invention, the seat of each tooth has at least one support area against which the tooth, in particular an end section of the tooth, is supported.

[0033] According to one aspect of the invention, the end section of the tooth has an edge that rests against this support area of ​​the seat.

[0034] According to one aspect of the invention, the support area of ​​the seat is formed on the central hub or on the outer ring or on one of the radial legs of the multifunctional carrier.

[0035] According to one aspect of the invention, the seat of each tooth has at least two support areas on which the tooth, in particular an end section of the tooth, is supported.

[0036] According to one aspect of the invention, these two support areas of the seat are radially spaced apart from each other, and the end section of the tooth has a radially inner edge and a radially outer edge, each of which rests against one of the support areas of the seat.

[0037] According to one aspect of the invention, the end section of the tooth has two circumferentially spaced side edges which, together with the radially inner and radially outer edges, form the circumference of this end section of the tooth.

[0038] According to one aspect of the invention, the two side edges of the tooth end section are arranged opposite the circumferential space between two adjacent radial legs of the multifunctional carrier.

[0039] In other words, the tooth is not supported by the radial legs of the multifunctional carrier, but only by the two support areas.

[0040] According to one aspect of the invention, the two support areas of the seat are formed on the middle hub and on the outer ring, respectively.

[0041] According to one aspect of the invention, each support area is a circumferential strip extending from one of the radial legs to one of the adjacent radial legs.

[0042] According to one aspect of the invention, the radial dimension of the support area is less than 20%, in particular less than 10%, of the radial dimension of the radial leg.

[0043] Thus, the support area has a relatively small radial dimension compared to the radial legs.

[0044] According to another aspect of the invention, these two support areas are spaced apart from each other in the circumferential direction, and the end section of the tooth has two circumferentially spaced side edges which each support one of the support areas of the seat.

[0045] According to one aspect of the invention, the end section of the tooth has a radially inner edge and a radially outer edge which, together with the side edges, form the circumference of this end section of the tooth.

[0046] According to one aspect of the invention, the radially inner edge and the radially outer edge of the end section of the tooth lie opposite the circumferential space between two adjacent radial legs of the multifunctional carrier.

[0047] In other words, the tooth is not supported by the central hub and the outer ring of the multi-function carrier, but only by the two support areas.

[0048] According to one aspect of the invention, the two support areas of the seat are each formed on two adjacent radial legs.

[0049] According to one aspect of the invention, each support area is a radial strip extending substantially from the central hub to the outer ring on one of the radial legs.

[0050] Thus, each radial leg has two support areas for two adjacent teeth.

[0051] According to one aspect of the invention, the radial leg has a reinforcing rib that runs radially and extends in particular in a straight line between the two adjacent support areas of this radial leg.

[0052] According to one aspect of the invention, this radial leg thus has a T-shaped cross-section.

[0053] According to one aspect of the invention, the end section of the tooth has a shoulder along each lateral edge which is designed to rest against one of the support areas of the seat, and wherein the end section of the tooth extends between these shoulders into the circumferential space between two adjacent radial legs of the multifunctional carrier.

[0054] According to one aspect of the invention, each tooth has a core around which the winding is arranged and which extends along the axis of rotation, and has at each of its axial ends an end section extending transversely to the core, wherein the end section has an outer main surface oriented opposite to the core and has a groove in a central region of this outer main surface, wherein the central region is spaced circumferentially from two lateral edges of the end section and the groove is designed to reduce the torque ripples that may occur during operation of the electric axial flux machine.

[0055] According to one aspect of the invention, the two end sections of the tooth are symmetrical to each other by a plane of symmetry perpendicular to the axis of rotation.

[0056] According to one aspect of the invention, the multifunctional carrier has at least one positioning projection that extends into the circumferential space between two adjacent radial legs of the multifunctional carrier, wherein this positioning projection is designed to interact with the tooth, in particular with the end section of the tooth.

[0057] According to one aspect of the invention, the projection extends from one of the radial legs, in particular substantially in the middle of this radial leg.

[0058] According to one aspect of the invention, each circumferential space is assigned two opposing positioning projections, each belonging to the two legs on one side and the other side of this circumferential space.

[0059] According to another aspect of the invention, the positioning projection extends from the central hub or the outer ring of the multifunctional carrier.

[0060] According to one aspect of the invention, each circumferential space is assigned two opposing positioning projections, each belonging to the central hub and the outer ring of the multifunctional carrier.

[0061] According to one aspect of the invention, the positioning projection is in the form of a ribbing.

[0062] According to one aspect of the invention, the multifunctional carrier comprises a one-piece body, which is made in particular of plastic, in particular by molding, and wherein this one-piece body comprises the radial legs, the hub and the outer ring.

[0063] The invention enables a simplification of the construction of the electric axial flux machine, since only a few parts are required, including the aforementioned one-piece body.

[0064] According to one aspect of the invention, the electrical conductors of the multifunctional carrier are conductive rods.

[0065] According to one aspect of the invention, these conductive rods are supported by the one-piece body of the carrier.

[0066] According to one aspect of the invention, the conductive rods are supported by the outer ring of the multifunctional carrier.

[0067] According to one aspect of the invention, the guiding rods have a circular shape that essentially conforms to the shape of the outer ring.

[0068] According to one aspect of the invention, the conductive rods each comprise a tab for electrical connection with one of the electrical winding wires.

[0069] According to one aspect of the invention, this connecting tab extends axially and parallel to the axis of rotation.

[0070] According to one aspect of the invention, the outer ring thus carries several connecting tabs distributed around the axis of rotation.

[0071] According to one aspect of the invention, these rods are at least partially embedded in a resin which is supported by the outer ring, in particular between its inner and outer edges.

[0072] According to one aspect of the invention, the multifunctional carrier, in particular the one-piece body, has a compartment formed on the outer ring which is designed to receive the electrical output ends of the conductive rods, so that an electrical connection of these conductive rods with an external electrical device is possible.

[0073] According to one aspect of the invention, the stator comprises a housing designed to interact with the multifunction carrier such that the teeth are enclosed between this multifunction carrier and this housing.

[0074] According to one aspect of the invention, the housing and the multi-functional carrier are fastened to each other with fastening elements such as screws.

[0075] According to one aspect of the invention, the multifunctional carrier is completely housed within an internal volume of the casing.

[0076] According to one aspect of the invention, a cover is provided for closing the housing.

[0077] According to one aspect of the invention, this cover is generally flat and extends perpendicular to the axis of rotation.

[0078] According to one aspect of the invention, this cover is attached to an annular end edge of the housing, in particular with fastening elements such as screws.

[0079] According to one aspect of the invention, a particularly annular seal is arranged between this end of the housing and the cover.

[0080] According to one aspect of the invention, a rotor housed in the casing is arranged axially between the multi-function carrier and this cover.

[0081] According to one aspect of the invention, the housing comprises several seats, each of which is supported by a tooth.

[0082] According to one aspect of the invention, the seats of the housing are arranged around the axis of rotation, in particular in a uniform manner.

[0083] Thus, each tooth is sandwiched between a seat of the housing and a seat of the multifunctional carrier.

[0084] According to one aspect of the invention, the housing seat and the multifunction carrier seat have an identical surface.

[0085] According to one aspect of the invention, each seat is limited by two radial legs of the housing.

[0086] According to one aspect of the invention, each tooth is positioned circumferentially between two adjacent radial legs.

[0087] According to one aspect of the invention, the end section of the tooth extends at least partially into a circumferential space between two adjacent radial legs of the housing.

[0088] This allows the tooth to move axially closer to the adjacent rotor, thereby reducing the air gap between the stator and rotor.

[0089] This improves the electromechanical performance of the machine.

[0090] According to one aspect of the invention, the end section of the tooth traverses the circumferential space and closes off essentially flush with the radial legs on the side of the air gap.

[0091] In this way, the radial legs of the multifunctional carrier do not extend axially beyond the end sections of the teeth on the side of the air gap, and the outer main surface of the end section of the tooth runs essentially in extension of the radial legs.

[0092] According to one aspect of the invention, the radial legs of the housing seat are flat and, in particular, run perpendicular to the axis of rotation.

[0093] According to one aspect of the invention, the arms extend in a straight line in the radial direction.

[0094] According to another aspect of the invention, one of the radial legs is provided with a reinforcing rib. This radial leg can, for example, have a T-shape in cross-section.

[0095] According to one aspect of the invention, the housing comprises an inner annular wall and an outer annular wall, and the radial legs defining the seats extend radially between this inner annular wall and the outer annular wall.

[0096] According to one aspect of the invention, the seat for each tooth has at least one support area against which the tooth, in particular an end section of the tooth, is supported.

[0097] According to one aspect of the invention, the end section of the tooth has an edge that rests against this support area of ​​the seat.

[0098] According to one aspect of the invention, the support area of ​​the seat is formed on the inner ring wall or on the outer ring wall or on one of the radial legs of the housing.

[0099] According to one aspect of the invention, the seat of each tooth has at least two support areas on which the tooth, in particular an end section of the tooth, is supported.

[0100] According to one aspect of the invention, these two support areas of the seat are radially spaced apart from each other, and the end section of the tooth has a radially inner edge and a radially outer edge, each of which rests against one of the support areas of the seat.

[0101] According to one aspect of the invention, the end section of the tooth has two circumferentially spaced side edges which, together with the radially inner and radially outer edges, form the circumference of this end section of the tooth.

[0102] According to one aspect of the invention, the two lateral edges of the end section of the tooth are opposite the circumferential space between two adjacent radial legs of the housing.

[0103] In other words, the tooth is not supported by the radial legs of the housing, but only by the two support areas.

[0104] According to one aspect of the invention, the two support areas of the seat are formed on the inner ring wall and on the outer ring wall, respectively.

[0105] According to one aspect of the invention, each support area is a circumferential strip extending from one of the radial legs to one of the adjacent radial legs.

[0106] According to one aspect of the invention, the radial dimension of the support area is less than 20%, in particular less than 10%, of the radial dimension of the radial leg.

[0107] Thus, the support area has a relatively small radial dimension compared to the radial legs.

[0108] According to another aspect of the invention, these two support areas of the housing are spaced apart from each other in the circumferential direction, and the end section of the tooth has two circumferentially spaced side edges which each support one of the support areas of the seat.

[0109] According to one aspect of the invention, the end section of the tooth has a radially inner edge and a radially outer edge which, together with the side edges, form the circumference of this end section of the tooth.

[0110] According to one aspect of the invention, the radially inner edge and the radially outer edge of the tooth end section lie opposite the circumferential space between two adjacent radial legs of the housing.

[0111] In other words, the tooth is not supported by the inner ring wall and the outer ring wall of the housing, but only by the two support areas, each formed on two adjacent radial legs.

[0112] According to one aspect of the invention, each support area is a radial strip extending substantially from the inner ring wall to the outer ring wall along one of the radial legs.

[0113] Thus, two support areas are formed on each radial leg, each for two adjacent teeth.

[0114] According to one aspect of the invention, the radial leg has a radial reinforcing rib which extends in particular in a straight line between the two adjacent support areas of this radial leg.

[0115] This radial leg therefore has a T-shaped cross-section.

[0116] According to one aspect of the invention, the end section of the tooth has a shoulder along each lateral edge which is designed to support itself against one of the support areas of the seat, and wherein the end section of the tooth extends between these shoulders into the circumferential space between two adjacent radial legs of the housing.

[0117] According to one aspect of the invention, the housing has at least one positioning projection that extends into the circumferential space between two adjacent radial legs of the housing, wherein this positioning projection is arranged to interact with the tooth, in particular with the end section of the tooth.

[0118] According to one aspect of the invention, the positioning projection extends from one of the radial legs, in particular substantially in the middle of this radial leg.

[0119] According to one aspect of the invention, each circumferential space is assigned two opposing positioning projections, each belonging to the two legs on one side and the other side of this circumferential space.

[0120] According to another aspect of the invention, the positioning projection extends from the inner ring wall or the outer ring wall of the housing.

[0121] According to one aspect of the invention, each circumferential space is assigned two opposing positioning projections that belong to the inner ring wall and the outer ring wall of the housing, respectively.

[0122] According to one aspect of the invention, the positioning projection is in the form of a ribbing.

[0123] According to one aspect of the invention, the housing is, for example, made of plastic.

[0124] According to one aspect of the invention, the inner annular wall of the housing has a central opening designed to allow a rotating shaft to pass through, which is connected to one or more rotors of the electric axial flux machine.

[0125] According to one aspect of the invention, the housing has an inner ring-shaped shoulder against which the multi-function carrier is supported.

[0126] According to one aspect of the invention, this inner ring-shaped shoulder is formed on the outer ring wall of the housing.

[0127] According to one aspect of the invention, a rotor is arranged outside the housing opposite the radial legs of the housing.

[0128] According to one aspect of the invention, the electrical winding on the tooth is formed by windings of an electrical wire around the tooth.

[0129] The invention also relates to a multifunctional carrier for a stator of an electric axial flux machine, wherein this multifunctional carrier or connecting carrier is designed to carry several stator teeth, each of which is provided with a winding, and wherein this multifunctional carrier is provided with conductors for electrical connection, which are arranged for connection with the electrical windings.

[0130] The invention also relates to an electric axial flux machine, in particular of the type with permanent magnets, with a stator as described above and at least one rotor which is arranged in an axial direction relative to the stator.

[0131] According to one aspect of the invention, the electric axial flux machine is configured to operate in motor mode. In this case, the windings are designed to be electrically energized, generating a magnetic field that can produce an output torque with one or more rotors of the electric axial flux machine. In this case, the electric axial flux machine can be used as a vehicle propulsion machine.

[0132] According to another aspect of the invention, the electric axial flux machine is designed for operation in electric generator mode.

[0133] According to another aspect of the invention, the electric axial flux machine is designed to operate alternately in generator mode and motor mode as needed.

[0134] According to one aspect of the invention, the permanent magnets are supported by the rotor(s).

[0135] According to one aspect of the invention, the rotor comprises a plate carrying several permanent magnets, the contour of which essentially has the shape of a disk sector.

[0136] According to one aspect of the invention, the magnets have a thickness that is less than the thickness of the plate, these thicknesses being measured along the axis of rotation.

[0137] According to one aspect of the invention, the machine comprises two rotors arranged axially opposite the stator on one side and the other side of the stator.

[0138] According to one aspect of the invention, the electrical winding on the tooth is formed by windings of an electrical wire around the tooth.

[0139] According to one aspect of the invention, a resin, in particular an epoxy resin, is present on the windings of the windings and in contact with the stator housing, so that the strength of the windings and the heat conduction of these windings with the stator housing are improved.

[0140] According to one aspect of the invention, the stator housing is designed to carry an electrical connector for the electrical connection of the conductors to the electrical connection of the stator.

[0141] According to one aspect of the invention, the stator housing is arranged such that it supports a bearing, in particular a ball bearing, for the rotor shaft.

[0142] According to one aspect of the invention, the machine is designed as a permanent magnet synchronous motor, in particular for driving an electric vehicle.

[0143] The invention also relates to a method for manufacturing an electric axial flux machine, comprising the following steps: - Providing a multi-functional carrier, as described above, - Arranging the teeth, each with an electrical winding wound on the corresponding tooth, on this multifunctional carrier.

[0144] According to one aspect of the invention, the method comprises the following step: - Welding the ends of the electrical wires of the windings to the conductors for electrical connection of the carrier.

[0145] According to one aspect of the invention, the method comprises the following step: - Applying a resin, especially an epoxy resin, to the windings to improve the strength of the windings and the heat conduction of these windings to the stator housing.

[0146] Furthermore, electric machines with a rotor containing integrated permanent magnets are known to frequently exhibit torque ripple, which is associated with the presence of cogging torque and disrupts the machine's output torque. The torque ripple is generated by the mutual attraction between a pole of the rotor and a pole of the stator, specifically between the rotor magnets and the stator teeth. Each time the ends of the magnets pass a stator tooth as the rotor rotates relative to the stator, the magnetic field flows to the stator, generating a cogging torque pulse.

[0147] The invention aims to reduce these effects of torque ripple and cogging torque in an electric axial flux machine.

[0148] The invention also relates, independently of the foregoing or in combination therewith, to a stator of an electric axial flux machine, wherein the machine has an axis of rotation and the stator comprises the following: - several electrical windings, - several teeth, each carrying one of the electrical windings, and wherein each tooth has a core around which the winding is formed and which extends along the axis of rotation, and at each of its axial ends has an end section extending transversely to the core, wherein the end section has an outer main surface oriented opposite to the core and has a groove in a central region of this outer main surface, wherein the central region is spaced circumferentially from two lateral edges of the end section, wherein the groove is designed to reduce the torque ripples that may occur during the operation of the electric axial flux machine.

[0149] The central area of ​​the outer main surface of the end section of the tooth denotes an area that is spaced circumferentially from the two lateral edges of the end section.

[0150] According to the invention, it is possible in an electric axial flux machine, especially with permanent magnets, to reduce torque ripple, which is associated with the presence of a cogging torque and disturbs the output torque of the electric axial flux machine, by means of the groove in the middle region of the outer main surface.

[0151] This can improve the electromechanical performance of the electric axial flux machine.

[0152] According to one aspect of the invention, the end section of the tooth has a radially inner edge and a radially outer edge, wherein these edges in particular run parallel and the groove extends between this radially inner and this radially outer edge.

[0153] According to one aspect of the invention, the radially inner and the radially outer edges are concentric.

[0154] According to one aspect of the invention, the groove connects this radially inner and radially outer edge at its ends.

[0155] Thus, the groove traverses the entire end section of the tooth from its radially inner edge to its radially outer edge.

[0156] According to one aspect of the invention, the groove has a straight shape along a radial direction of the stator.

[0157] Preferably, the groove has a radial dimension of at least 50% of the general radial dimension of the tooth.

[0158] In other words, in order to fulfill this function of reducing torque ripple, the groove must have sufficient dimensions in the radial direction.

[0159] This groove, for example, must not be reduced to a single point.

[0160] In one variant, the groove connects only the radially inner or radially outer edge and remains at a non-zero distance to the other edge.

[0161] Thus, one of the ends of the groove is recessed relative to one of these edges, the radially inner or the radially outer edge, with this groove having, for example, a radial dimension that is smaller than the general radial dimension of the tooth.

[0162] In another variant, the groove is recessed both relative to the radially inner and the radially outer edge.

[0163] Thus, this groove is not in contact with any of these edges, the radial inner and the radial outer edge, and has a radial dimension that is smaller than the general radial dimension of the tooth.

[0164] According to one aspect of the invention, the groove between its ends is continuous.

[0165] In one version, the groove between its ends is interrupted.

[0166] Thus, the groove consists of several sections, which are arranged one after the other with a uniform or uneven distance between these sections.

[0167] According to one aspect of the invention, the groove is straight and runs along a radial centerline of the outer main surface of the tooth.

[0168] Thus, the groove is centered on this outer main surface.

[0169] According to one aspect of the invention, the groove runs in a curved shape, for example with one or more rounded bends.

[0170] According to one aspect of the invention, the groove is formed by a groove on the outer main surface of the end section of the tooth.

[0171] According to one aspect of the invention, the groove forming the slot has a depth that is essentially half the thickness of the end section of the tooth.

[0172] This depth is measured parallel to the axis of rotation.

[0173] According to one aspect of the invention, the groove has a rectangular cross-section, a trapezoidal cross-section or a semicircular cross-section.

[0174] According to one aspect of the invention, the groove has several facets, in particular flat facets, which adjoin each other along a chamfer or a rounding.

[0175] According to one aspect of the invention, the outer main surface of the end section of the tooth has several grooves in a central area designed to reduce torque ripples that may occur during operation of the machine.

[0176] According to one aspect of the invention, these grooves extend radially at an angular distance from each other.

[0177] According to one aspect of the invention, the groove is designed to interact with a positioning projection of a multifunctional carrier or a housing of the stator.

[0178] According to one aspect of the invention, this positioning projection comprises a radial intermediate leg of the multi-function carrier or the housing.

[0179] According to one aspect of the invention, the radial intermediate leg of the multifunctional carrier is positioned circumferentially between two radial legs that define a seat for the tooth.

[0180] This interaction between the groove of the tooth and this radial intermediate leg enables an improvement in the mechanical retention of the tooth on the multifunctional carrier.

[0181] According to one aspect of the invention, the wire windings forming the coil extend between the two end sections of the tooth.

[0182] According to one aspect of the invention, the tooth has mirror symmetry along a plane of symmetry that includes the axis of rotation.

[0183] In one variant, the tooth has no mirror symmetry along a plane of symmetry that contains the axis of rotation.

[0184] According to one aspect of the invention, each tooth comprises a stack of sheet metal, wherein this stack is in particular arranged radially.

[0185] According to one aspect of the invention, these sheets are electrical steel sheets, in particular grain-oriented electrical steel sheets.

[0186] According to one aspect of the invention, the grain orientation runs parallel to the axis of rotation.

[0187] In one variant, each tooth is made of a soft magnetic composite material, known as "Soft Magnetic Composite (SMC)", which is obtained in particular by sintering.

[0188] Further features and advantages of the invention will become clearer upon reading the following description, which is given as illustrative and non-limiting examples, and from the accompanying drawings. These show: - Fig. 1 schematic and partially perspective view of an electric axial flux machine according to an embodiment of the invention; - Fig. 2. Schematic and partly perspective view of the electric axial flux machine. Fig. 1 without cover; - Fig. 3. Schematic and partly perspective view of the electric axial flux machine. Fig. 1 without one of the rotors; - Fig. 4 schematically and partly in perspective the multifunctional carrier and the teeth of the stator of the electric axial flux machine. Fig. 1; - Fig. 5 schematically and partly perspectivally in another view the multifunctional carrier and the teeth of the stator of the electric axial flux machine Fig. 1; - Fig. 6. Schematic and partly perspective view of the multifunction carrier without the teeth of the stator. Fig. 4; - Fig. 7 schematically and partly in perspective an area of ​​the multifunctional carrier Fig. 6; - Fig. 8 schematically and partly in perspective the multifunction carrier and the teeth of the stator Fig. 4, one tooth not shown; - Fig. 9 schematically and partly in perspective one of the conductors for the electrical connection of the multifunctional carrier Fig. 4; - Fig. 10 schematically and partly in perspective one of the teeth of the stator Fig. 4; - Fig. 11 schematic and partly perspective view of the housing of the electric axial flux machine Fig. 1; - Fig. 12 schematically and partly in perspective one of the rotors of the electric axial flux machine Fig. 1; - Fig. 13 schematically and partly in perspective a multi-functional carrier according to a further embodiment of the invention; - Fig. 14 schematically and partly in perspective, an area of ​​the multifunctional carrier Fig. 13; - Fig. 15 schematically and partly in perspective the multifunctional carrier Fig. 13 and the stator teeth; - Fig. 16 schematically and partly in perspective a section of the multifunctional carrier from Fig. 13 and one of the stator teeth, - Fig. 17 schematically and partly in perspective the entirety of the conductors for the electrical connection of the multifunctional carrier Fig. 4; - Fig. 18 schematically and partly in perspective the stator housing according to a further embodiment of the invention; - Fig. 19 schematically and partly in perspective a tooth which is connected to the stator housing made of Fig. 18 works together.

[0189] The Fig. 1 and Fig. Figure 2 shows an electric axial flux machine 1 of the type with permanent magnets with a rotational axis X, comprising a stator 2 and two rotors 3 and 4, which are arranged axially opposite the stator 2 on one and the other side of the stator 2. Fig. Figure 2 shows no cover on the stator 2, so the rotor 4 is visible.

[0190] In the described example, the electric axial flux machine 1 is designed for operation in both motor and generator modes. It is a permanent magnet synchronous motor for powering an electric vehicle.

[0191] Each rotor 3, 4 comprises a plate 5 which carries several permanent magnets 7, the contour of which is essentially disk-sector shaped, as in Fig. 12 shown.

[0192] The magnets 7 have a thickness that is less than the thickness of the plate 5, with these thicknesses being measured along the axis of rotation X.

[0193] Stator 2 comprises the following: - several electrical windings 10, which are particularly in the Fig. 4 and Fig. 8 can be seen, - several teeth 11, each carrying one of the electrical windings 10, - a multifunctional carrier 12 or connecting carrier designed to support the multiple teeth 11, wherein this multifunctional carrier 12 is provided with conductors 14 for electrical connection which are arranged for connection with the electrical windings 10.

[0194] The windings 10 on the teeth 11 together form a stator coil, for example of the three-phase type. These windings 10 are formed by turns of electrical wires around each tooth 11.

[0195] Each tooth 11 comprises a radial stack of grain-oriented electrical steel sheets.

[0196] The grain orientation runs parallel to the axis of rotation.

[0197] In one variant, each tooth 11 consists of a soft magnetic composite material, English "Soft Magnetic Composite (SMC)", which is obtained in particular by sintering.

[0198] The windings 10 are designed to be electrically supplied, so that a magnetic field is generated which can generate an output torque with the rotors 3 and 4 of the electric axial flux machine 1.

[0199] Epoxy resin can be applied to the windings of the windings 10.

[0200] The multi-function carrier 12 has a central hub 18 and an outer ring 19, with radial legs 20 extending radially between this central hub 18 and the outer ring 19.

[0201] In the described example, the multi-functional carrier 12 has a one-piece body 48 which is made of plastic by molding, wherein this one-piece body 48 has the radial legs 20, the central hub 18 and the outer ring 19.

[0202] The central hub 18 has a central opening 21 which is designed to allow a rotating shaft 23 to pass through, which is connected to the rotors 3 and 4 of the electric axial flux machine 1.

[0203] The outer ring 19 comprises an outer shell 25 and an inner shell 26, which are arranged concentrically and are both cylindrical with an axis parallel to the axis of rotation X.

[0204] The radial legs 20 are connected to the inner surface 26 of the outer ring 19. Thus, the radial legs 20 extend between the central hub 18 and this inner surface 26 of the outer ring 19.

[0205] As in Fig. As can be clearly seen in Figure 5, the inner mantle 26 and the outer mantle 25 are connected to each other by a circumferential flat strip 27, so that the outer ring 19 has a U-shaped cross-section.

[0206] The conductors 14 for electrical connection are arranged between the inner sheath 26 and the outer sheath 25 of the outer ring 19.

[0207] As in the Fig. 9 and Fig. As shown in Figure 17, each conductor 14 for electrical connection comprises a flat, circular conductive rod 15 to which eight electrical connection tabs 16 are attached, arranged for connection with the electrical wires that form the windings 10. These electrical connection tabs 16 are evenly spaced on the flat conductive rod 15 and extend axially parallel to the axis of rotation X.

[0208] The eight electrical windings 10, each assigned to a conductor 14 for electrical connection, belong to the same electrical phase. In the described example, three conductors 14 are provided for electrical connection, assigned to the three electrical phases, as well as one conductor 114 for electrical connection, which forms the electrical neutral conductor. This conductor 114 for electrical connection has lugs 116 for electrical connection. The four conductors 14 and 114 for electrical connection are arranged one above the other with a gap between them to prevent electrical contact.

[0209] It is also a ring-shaped, neutral electrical rod with tabs 29 for electrical connection (for example in Fig. 8 visible) provided for each electrical winding 10.

[0210] As in the Fig. 4 and Fig. As shown in Figure 5, a space 30 formed on the outer ring 19 is designed to accommodate three ends 17 for the electrical output of the three conductive rods 15 in order to enable an electrical connection of these conductive rods 15 with an external electrical device for supplying the stator 2 with three-phase current.

[0211] The compartment 30 with the three ends 17 for the electrical output is integrated into an electrical plug 32 of the electric axial flux machine 1.

[0212] The conductive rods 15 are embedded in a resin 31, which is introduced into the outer ring 19 between its inner sheath 26 and outer sheath 25. The tabs 16 for electrical connection are left free, i.e., not embedded in the resin 31.

[0213] The multifunctional carrier 12 comprises several seats 33, each of which is supported by a tooth 11.

[0214] These tooth seats 33 are evenly spaced around the axis of rotation X.

[0215] Each seat 33 is bounded by two radial legs 20 of the multifunctional carrier 12, such that each tooth 11 is positioned circumferentially between two adjacent radial legs 20 extending along two geometric radii of the multifunctional carrier 12.

[0216] As in Fig. As shown in Figure 10, each tooth 11 has a core 34 around which the electrical winding 10 is formed and which extends along the axis of rotation X, and at each of its axial ends an end section 35 which extends transversely to the core 34.

[0217] Each end section 35 defines an essentially T-shaped form with the core 34. The two end sections 35 of the tooth 11 are symmetrical to each other by a plane of symmetry that runs perpendicular to the core 34 and to the axis of rotation X.

[0218] Each end section 35 has an outer main surface 36 which is flat overall and oriented opposite to the core 34.

[0219] This outer main surface 36 extends perpendicular to the axis of rotation X and has an essentially trapezoidal perimeter. In a variant not shown, this perimeter can, for example, be rectangular, and each radial leg 20 can have a variable width when following the leg from the center outwards, so that this leg adapts to the rectangular shape of the outer main surface 36 of the tooth. The radial leg is thus to be understood more broadly as having a constant or variable width and, optionally, a direction that deviates from a geometric radius of the multifunctional carrier 12.

[0220] An electrical insulator in the form of an insulating foil or an insulating coating is arranged between the core 34 of each tooth 11 and the winding 10.

[0221] The end section 35 of the tooth 11 extends into a circumferential space 38 between two adjacent radial legs 20 of the multifunctional carrier 12.

[0222] The end section 35 of the tooth 11 traverses this circumferential space 38, terminating essentially flush with the radial legs 20 on the side of the air gap.

[0223] Thus, the end section 35 of the tooth 11 does not project axially beyond the radial legs 20 on the side of the air gap, and the outer main surface 36 of the end section 35 of the tooth 11 lies essentially in the extension of the radial legs 20.

[0224] This brings each tooth 11 axially closer to the adjacent rotor 3 or 4, thereby reducing the air gap between the stator 2 and the rotor 3 or 4.

[0225] The radial legs 20 are straight and flat and extend perpendicular to the axis of rotation X.

[0226] Each seat 33 of the multifunctional carrier 12 has a pair consisting of a first support area 40 and a second support area 41 against which the end section 35 of the tooth rests, as shown in the Fig. 7 and Fig. 8 is clearly visible.

[0227] In Fig. 8 One of the teeth 11 is not shown in order to make the corresponding seat 33 more visible.

[0228] The first support area 40 of this pair of support areas is formed on the outer shell 25 of the outer ring 19.

[0229] The second support area 41 of this pair of support areas is formed on the middle hub 18.

[0230] Thus, these first and second support areas 40 and 41 are spaced apart in a radial direction, and the end section 35 of the tooth has a radially inner edge 43 and a radially outer edge 44, which are supported on the first and second support areas 41 and 40 respectively.

[0231] The end section 35 of the tooth has two circumferentially spaced side edges 45 which, together with the radially inner edge 43 and the radially outer edge 44, form the circumference of this end section 35.

[0232] The two lateral edges 45 of the end section 35 of the tooth are opposite the circumferential space 38 between two adjacent radial legs 20 of the multifunctional carrier 12.

[0233] In other words, the end section 35 of the tooth does not rest on the radial legs 20 of the multifunctional carrier 12, but only on the first and second support areas 40 and 41.

[0234] Each support area 40 and 41 is a circumferential strip extending from one of the radial legs 20 to one of the adjacent radial legs 20. These first and second support areas 40 and 41 are axially offset relative to the radial legs 20 such that the end section 35 of the tooth, upon contact with these first and second support areas 40 and 41, can penetrate into the circumferential space 38 between two radial legs 20.

[0235] The radial dimension of the support area 40, 41 is less than 20%, in particular less than 10%, of the radial dimension of the radial leg. Thus, the support area 40, 41 has a relatively small radial dimension compared to the radial legs 20.

[0236] The multifunctional carrier 12 has two opposing positioning projections 46 for each seat 33, projecting into the circumferential space 38, these positioning projections 46 being designed to interact with the end section 35 of the tooth 11.

[0237] Each positioning projection 46 is in the form of a knurling and extends from one of the radial legs 20s essentially in the middle of this radial leg 20.

[0238] The stator 2 has a housing 50 (in Fig. 11 shown separately), which is designed to interact with the multi-function carrier 12, such that the teeth 11 are enclosed between this multi-function carrier 12 and this housing 50.

[0239] The housing 50, which is manufactured by compression molding a plastic material or by forming an aluminum alloy, and the multifunctional carrier 12 are connected to each other with screws.

[0240] The multi-function carrier 12 is completely housed within an internal volume 51 of the housing 50.

[0241] A completely flat cover 52 is provided for closing the internal volume 51 of the housing 50.

[0242] This cover 52 is attached to an annular end 53 of the housing 50 by screws. A ring seal is arranged between this cover 52 and this annular end 53 of the housing 50.

[0243] The rotor 4 is housed in the casing 50 and is arranged axially between the multifunction carrier 12 and this cover 52.

[0244] The housing 50 includes several seats 55, each of which supports a tooth 11.

[0245] The seats 55 of the housing 50 are arranged evenly around the axis of rotation X.

[0246] Thus, each tooth 11 is sandwiched between a seat 55 of the housing 50 and a seat 33 of the multifunctional carrier 12.

[0247] The seat 55 of the housing 50 and the seat 33 of the multifunction carrier 12 have an identical surface.

[0248] Each seat 55 of the housing 50 is bounded by two radial legs 56 of the housing 50.

[0249] Each tooth 11 is positioned circumferentially between two adjacent radial legs 56.

[0250] The end section 35 of the tooth 11 extends into a circumferential space 57 between two adjacent radial legs 56 of the housing 50.

[0251] This causes tooth 11 to move axially closer to the adjacent rotor 3, thereby reducing the air gap between the stator 2 and the rotor 3.

[0252] The rotor 3 is arranged outside the housing 50 opposite the radial legs 56 of the housing 50.

[0253] The end section 35 of the tooth traverses the circumferential space 57 and, on the side of the air gap with the rotor 3, is essentially flush with the radial legs 56.

[0254] Thus, the end section 35 of the tooth on the side of the air gap with the rotor 3 does not project axially beyond the radial legs 56, and the outer main surface 36 of the end section 35 of the tooth lies essentially in the extension of the radial legs 56.

[0255] The radial legs 56 of the housing 50 are straight and flat and extend perpendicular to the axis of rotation X.

[0256] The radial legs 56 are each provided with a reinforcing rib 58. Thus, each radial leg 56 has a T-shaped cross-section.

[0257] This rib 58 extends between two adjacent teeth 11.

[0258] The housing 50 comprises an inner annular wall 60 and an outer annular wall 61, and the radial legs 56 bounding the seats 55 extend radially between this inner annular wall 60 and the outer annular wall 61.

[0259] The inner annular wall 60 of the housing 50 has a central opening 67 which is designed to allow the rotating shaft 23 connected to the rotors 3 and 4 of the electric axial flux machine 1 to pass through.

[0260] The housing 50 is designed to carry ball bearings 69, which serve as bearings for the rotating shaft 23.

[0261] The housing 50 has an inner ring-shaped shoulder 68 on which the multi-function carrier 12 is supported.

[0262] This inner ring-shaped shoulder 68 is formed on the outer ring wall 61 of the housing 50.

[0263] The seat 55 for each tooth 11 has two radially spaced support areas 63 and 64.

[0264] The support area 63 of the seat 55 is formed on the inner ring wall 60.

[0265] The support area 64 of the seat 55 is formed on the outer ring wall 61.

[0266] Each support area 63, 64 is a circumferential strip extending from one of the radial legs 56 to one of the adjacent radial legs 56.

[0267] The radial inner edge 43 of the end section 35 of the tooth 11 rests against the support area 63 of the seat 55.

[0268] The radial outer edge 44 of the end section 35 of the tooth 11 rests against the support area 64 of the seat 55.

[0269] The two lateral edges 45 of the end section 35 of the tooth lie opposite the circumferential space 57 between two adjacent radial legs 56 of the housing 50.

[0270] In other words, the tooth 11 is not supported on the radial legs 56 of the housing 50, but only on the two support areas 63 and 64.

[0271] The radial dimension of the support area 63, 64 is less than 20%, in particular less than 10%, of the radial dimension of the radial leg 56.

[0272] Thus, the support area 63, 64 has a relatively small radial dimension compared to the radial legs 56.

[0273] With regard to the Fig. In sections 13 to 16, a multifunctional carrier 70 and teeth 71 are described according to a further embodiment of the invention.

[0274] This multi-function carrier 70 is similar to the multi-function carrier 12 described above, except for the seats 72 for the teeth 71, the seats 72 being different from the seats 33 of the previous example.

[0275] Teeth 71 are similar to teeth 11 from the previous example, except for end sections 73, which differ from end sections 35 from the previous example.

[0276] Referring to the seat 72 of the multifunctional carrier 70, this has two support areas 74 which are spaced apart from each other in the circumferential direction, and the end section 73 of the tooth 71 has two side edges 76 which are spaced apart from each other in the circumferential direction and each support one of the support areas 74 of the seat 72.

[0277] The end section 73 of the tooth 71 has a radially inner edge 77 and a radially outer edge 78, which together with the side edges 76 form the circumference of this end section 73 of the tooth 71.

[0278] The radial inner edge 77 and the radial outer edge 78 of the end section 73 of the tooth are opposite the circumferential space 79 between two adjacent radial legs 80 of the multifunctional carrier 70.

[0279] In other words, the tooth 71 is not supported on the middle hub 18 and the outer ring 19 of the multi-function carrier 70, but only on the two support areas 74.

[0280] These two support areas 74 of the seat 72 are each formed on two adjacent radial legs 80.

[0281] Each support area 74 is a radial strip extending substantially from the central hub 18 to the outer ring 19 on one of the radial legs 80.

[0282] Thus, on each radial leg 80, two support areas 74 are formed for each of two adjacent teeth 71.

[0283] Each radial leg 80 has a reinforcing rib 81 that runs radially and extends in a straight line between the two adjacent support areas 74 of this radial leg 80.

[0284] Each radial leg 80 thus has a T-shaped cross-section.

[0285] The end section 73 of the tooth 71 has a shoulder 83 along each side edge 76, which is designed to rest against one of the support areas 74 of the seat, and between these shoulders 83 the end section 73 of the tooth 71 extends into the circumferential space 79 between two adjacent radial legs 80 of the multifunctional carrier 70.

[0286] The seats and radial legs on the housing are symmetrical to the seats 72 of the multifunction carrier 70 and are not described in more detail.

[0287] In the described example, each circumferential space 79 is assigned to two opposing positioning projections 85, which belong to the central hub 18 and the outer ring 19 of the multifunctional carrier 70, respectively.

[0288] These positioning projections 85 in the form of ridges serve to position the tooth 71 in the circumferential space 79.

[0289] In the described example, each end section 73 has an outer main surface 86 which is oriented opposite to the core 34 and has a groove 90 in a central region 91 of this outer main surface 86, wherein the groove 90 is designed to reduce the torque ripples that may occur during operation of the electric axial flux machine.

[0290] The central region 91 of the outer main surface 86 of the end section 73 of the tooth designates a region that is spaced circumferentially from the two lateral edges 76 of the end section. The end section 73 of the tooth defines two tooth feet 89 that project on one side and the other of the core 34, thereby giving the core 34 its T-shape.

[0291] Each groove 90 connects at its two ends the radially inner edge 77 and the radially outer edge 78 of the end section 73.

[0292] Thus, the groove 90 traverses continuously and centers the entire outer main surface 86 of the end section 73 of the tooth from its radial inner edge 77 to its radial outer edge 78.

[0293] The slot 90 has a straight shape corresponding to a radial direction of the stator 2.

[0294] In a variant not shown, the 90 groove runs in a curved shape, for example with one or more rounded bends.

[0295] Each groove 90 is formed by a groove 93 on the outer main surface 86 of the end section 73 of the tooth.

[0296] The groove 93 has a depth ef that is essentially half the thickness ep of the end section 73 of the tooth 71. This depth and thickness are measured parallel to the axis of rotation X in the central region 91. The thickness ep corresponds to the maximum thickness of the tooth roots 89.

[0297] The 90 mm groove has a rectangular cross-section. In one variant, this cross-section can be trapezoidal or semicircular.

[0298] In a further embodiment of the invention, which is described in the Fig. 18 and Fig. As shown in Figure 19, each groove 90 of a tooth 111 is designed to interact with a positioning projection, which is an intermediate leg 151 of a multifunctional carrier or a housing 150 of the stator. The intermediate leg 151 extends through the center of the associated seat 133. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 2016113567

[0002]

Claims

[1] Stator (2) of an electric axial flux machine (1), wherein the electric axial flux machine has an axis of rotation (X), the stator comprising: - several electrical windings (10), - several teeth (11; 71), each carrying one of the electrical windings (10), - a multifunctional carrier (12; 70) or connecting carrier designed to support the multiple teeth (11; 71), wherein this multifunctional carrier is provided with conductors (14) for electrical connection, which are provided for connection with the electrical windings (10). [2] Stator according to the preceding claim, wherein the multifunctional carrier has several seats (33; 72) on which a tooth (11; 71) is supported. [3] Stator according to the preceding claim, wherein each seat (33; 72) is limited by two radial legs (20; 80) of the multifunction carrier (12; 70). [4] Stator according to the preceding claim, wherein each tooth (11; 71) has a core (34) around which the winding is formed and which extends along the axis of rotation (X), and has at each of its axial ends an end section (35; 73) which extends transversely to the core, and wherein this end section of the tooth extends at least partially into a circumferential space (38; 79) between two adjacent radial legs (20; 80) of the multifunction carrier. [5] Stator according to claim 3 or 4, wherein the multi-function carrier (12; 70) has a central hub (18) and an outer ring (19) and the radial legs (20; 80) defining the seats extend radially between this central hub and the outer ring. [6] Stator according to one of claims 2 to 5, wherein the seat (33; 72) of each tooth has at least one support area (63; 64; 74) on which the tooth, in particular an end section (35; 73) of the tooth, is supported. [7] Stator according to the preceding claim, wherein the support area (63; 64; 74) of the seat is formed on the central hub (18) or on the outer ring (19) or on one of the radial legs (20; 80) of the multifunction carrier. [8] Stator according to the preceding claim, wherein the seat of each tooth has at least two support areas (63, 64; 74) on which the tooth, in particular an end section (35; 73) of the tooth, is supported. [9] Stator according to the preceding claim, wherein the two support areas (63, 64) of the seat are radially spaced apart from each other and the end section (35) of the tooth has a radially inner edge (43) and a radially outer edge (44) which each support one of the support areas of the seat. [10] Stator according to claim 8, wherein the two support areas (74) are spaced apart from each other in the circumferential direction and the end section (73) of the tooth has two circumferentially spaced side edges (76) which each support one of the support areas (74) of the seat. [11] Stator according to one of the preceding claims, wherein each tooth has a core around which the winding is formed and which extends along the axis of rotation, and has at each of its axial ends an end section (73) extending transversely to the core, wherein the end section has an outer main surface oriented opposite to the core and has a groove (90) in a central region of this outer main surface, wherein the central region is spaced circumferentially from two side edges of the end section, wherein this groove is designed to reduce the torque ripples that may occur during the operation of the electric axial flux machine. [12] Stator according to the preceding claim, wherein each groove (90) is designed to interact with a positioning projection of a multifunction carrier or a stator housing, wherein this positioning projection in particular comprises a radial intermediate leg (151) of the multifunction carrier or the housing. [13] Stator according to one of the preceding claims, wherein the multifunctional carrier has at least one positioning projection (46; 85) that projects into the circumferential space between two adjacent radial legs of the multifunctional carrier, wherein this positioning projection is designed to interact with the tooth, in particular with the end section of the tooth. [14] Stator according to claim 5 and optionally according to any of the other preceding claims, wherein the multifunctional carrier has a one-piece body (48) which is made in particular of plastic, in particular by molding, and wherein this one-piece body comprises the radial legs, the hub and the outer ring. [15] Stator according to one of the preceding claims, wherein the stator (2) has a housing (50) designed to interact with the multifunctional carrier (12; 70) such that the teeth are enclosed between this multifunctional carrier and this housing, wherein in particular the housing (50) has several seats (55) on which each tooth is supported. [16] Stator according to claim 4 and optionally according to one of the preceding claims, wherein the radial legs (20; 80) of the multifunction carrier are axially recessed relative to the end sections (35; 73) of the teeth or are flush with the end sections of the teeth. [17] Stator according to one of the preceding claims, wherein each tooth of the several teeth (11; 71) is formed in one piece. [18] An electric axial flux machine (1), in particular of the type with permanent magnets, comprising a stator (2) according to one of the preceding claims and at least one rotor (3; 4) arranged in an axial direction relative to the stator (2).

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