Axial flux motor

Abstract

The present invention relates to an axial flux motor (1), comprising: a stator (3) including a yoke (4), teeth (44) and stator windings (8) wound on the teeth (44); a housing (2_2) housing the stator (3), the yoke (4) being rigidly attached to a wall (20) of the housing (2_2); a circular bus (7) connecting the ends (80) of the stator windings (8) to the circular bus (7), the circular bus (7) being arranged between the stator windings (8), the yoke (4) including a channel (42) on the side of the housing (2_1, 2_2), the channel (42) being radially through the yoke (4), and electrical connectors (32, 34, 36) passing through the channel (42) to connect the circular bus (7) to phase terminals (94, 96) at the periphery of the motor (1).

Description

Technical Field

[0001] This invention relates to the fields of electrical engineering and mechanics, and more specifically to an axial flux motor. Background Technology

[0002] Currently, electric or hybrid vehicles use electric traction or propulsion motors, which are typically radial flux motors, meaning that the direction of the magnetic flux generated by the stator windings of such machines is radial relative to the axial direction corresponding to the machine's rotation axis.

[0003] To reduce the size of such motors used for traction or propulsion in electric vehicles, axial flux motors are considered instead of radial flux motors. In practice, this type of machine is typically more compact, at least in the axial direction corresponding to the machine's rotation axis, thus giving it a disc-like appearance.

[0004] Therefore, this motor includes a housing with an overall cylindrical shape that houses at least one stator including stator coils, and a rotor fastened to a rotating shaft that passes through the middle of the housing. The stator coils are fastened within the housing between an inner cylindrical wall and an outer cylindrical wall that defines bearing supports for the rotating shaft. These stator coils are positioned at an angle around the inner cylindrical wall, opposite the magnetic poles of the rotor.

[0005] To electrically connect the stator coils to the phase terminals of the motor intended for connection to the inverter, the ends of the stator windings of each stator coil are first soldered to a circular bus, such as a three-phase bus, which is located on one side between the stator coils and on the other side between one of the inner or outer cylindrical walls of the housing. The phase connections of the circular bus are then made to electrical connectors that connect the circular bus to the phase terminals of the machine, accessible from outside the housing.

[0006] When the circular bus is located between the stator coils and the outer cylindrical wall, these electrical connections pass through, for example, the outer cylindrical wall of the housing. This configuration of the circular bus is advantageous for connecting the motor to the inverter, but due to the size of the circular bus, it is bulky in the radial direction and consumes a large amount of copper.

[0007] When the circular bus is located between the stator coils and the inner cylindrical wall, the electrical connection connecting the circular bus to the phase terminals typically passes through the planar wall of the housing, through which the rotating shaft extends. This solution increases axial volume. Additionally, it prevents the housing of another component (e.g., a gearbox) from being directly pressed against the planar wall of the motor housing. Summary of the Invention

[0008] The present invention aims to overcome at least some of the above-mentioned disadvantages by providing axial flux motors and electric or hybrid vehicles, which limit the radial and axial volume of the motor, despite the use of circular buses located between the motor stator coils and the rotating shaft fixed to the motor rotor.

[0009] Therefore, the present invention provides an axial flux motor, comprising:

[0010] Rotor,

[0011] The stator includes a yoke, teeth projecting from the yoke in the direction of the rotor, and stator windings wound around the teeth. The yoke has a crown-like shape extending radially from the inner radial periphery of the yoke to the outer radial periphery of the yoke.

[0012] A housing that houses the stator, the yoke being fixed to the wall of the housing.

[0013] A circular bus, the ends of the stator windings are connected to the circular bus, the circular bus being radially located on the side of the inner radial periphery of the yoke.

[0014] The motor is characterized in that the yoke includes a channel on the side of the housing that passes radially through the yoke and extends from the inner radial periphery of the yoke to the outer radial periphery of the yoke, and the motor also includes an electrical connection that enables a phase connection of a circular bus to be electrically connected to a phase terminal located in the outer peripheral portion of the motor, the electrical connection passing at least partially through the channel passing radially through the yoke.

[0015] Because of this invention, electrical connections do not require an axial increase in the size of the motor, as they can be fully integrated within the thickness of the yoke. Preferably, the latter is fastened to the wall of the housing on the side opposite the teeth by bonding, welding, or a keying system; this wall is a generally planar wall. There is no gap between the housing wall and the yoke, as the axial position of the stator is guaranteed by the housing. Furthermore, the radial dimension of the motor is limited, with a circular bus located between the stator windings and the channels formed in the stator to allow the rotational shaft fixed to the rotor to pass through.

[0016] It should be noted that the circular bus in this document should be understood as a circular connection device comprising several conductive rings (circular conductive bars) that are not necessarily closed, each conductive ring capable of conducting the phase current associated with a portion of the stator coil to which it is connected. One of the rings may correspond to the neutral connection of the motor and does not necessarily need to enter from outside the motor (and therefore does not necessarily need to be electrically connected to a dedicated terminal in the outer periphery of the motor).

[0017] Furthermore, in this application, the axial orientation or direction relates to the direction of rotation fixed to the rotor's axis of rotation, that is, to a direction parallel to the axis of rotation. The radial orientation or direction is orthogonal to the axial direction and tangent to the axis of rotation. The angular orientation or direction is orthogonal to both the axial and radial directions, that is, orthogonal to the radial direction.

[0018] For example, the axial flux motor according to the invention includes a rotor and two stators, or more rotors and fewer or more stators. It has a disc-shaped form, meaning its housing has a compact, generally cylindrical shape in the axial direction. For example, the base of this generally cylindrical shape is fixed to the rotating shaft of the rotor through which it passes. Alternatively, the rotating shaft passes through only one of these bases.

[0019] According to an optional feature of the invention, the electrical connection is covered with an electrically insulating material at least in the portion of the channel radially through the yoke. This insulating protection is necessary when the walls of the housing and the yoke are metallic and the electrical connection is not covered with an electrically insulating material. In practice, the housing is typically made of aluminum, and the yoke is typically made of magnetic steel.

[0020] Preferably, each electrical connector connects different phase portions of the circular busbar to different phase terminals located on the outer periphery of the motor via different channels that pass radially through the yoke. Using different channels for each phase of the motor allows the electrical connections to be thick enough to conduct large currents, while maintaining a reduced size within the yoke channels and not interfering with the flow of magnetic flux during motor operation.

[0021] Preferably, in this invention, each channel radially passing through the yoke shares a common orthogonal radial symmetry plane with the stator teeth, or each channel has an orthogonal radial symmetry plane angled to the stator teeth, and the distance between the channel and the winding slot near the teeth is greater than or equal to the thickness of the yoke. This feature allows the yoke to be cut out at the bottom of the teeth in locations where almost no magnetic flux passes during motor operation, thus without interfering with the latter.

[0022] In one embodiment of the invention, one phase terminal of the circular busbar and one phase connector of the phase connector intersect with an orthogonal radial symmetry plane, and one of the electrical connectors connects the phase terminal to the phase connector along the orthogonal radial symmetry plane. This electrical connection has no deviation relative to the orthogonal radial symmetry plane, and it is as short as possible, saving space and materials while facilitating its installation.

[0023] For example, the motor is a three-phase motor. The first phase terminal and the first phase connection, located on the first side of the orthogonal radial symmetry plane, are connected by a first electrical connection through a channel radially passing through the yoke. The second phase terminal, the second phase connection, and the second electrical connection correspond to those that intersect or follow the orthogonal radial symmetry plane. The third phase terminal and the third phase connection, located on the second side of the orthogonal radial symmetry plane opposite to the first side, are connected by a third electrical connection through a channel radially passing through the yoke. This configuration also optimizes the volume of the electrical connections and facilitates their installation. For example, the first and third electrical connections are symmetrical about each other with respect to the orthogonal radial symmetry plane and have only two orthogonal radial bends.

[0024] Preferably, in this invention, the radially penetrating channel through the yoke is a radial groove formed on the surface of the yoke opposite the wall of the housing. This embodiment facilitates the installation of electrical connections. Furthermore, when each radial groove has a common orthogonal radial plane symmetrical to the teeth of the stator, they minimize interference with magnetic flux by centering themselves on the edge of the tooth base. Alternatively, the channel takes the form of a radial hole in the yoke, thus at the base of the tooth.

[0025] According to an optional feature of this embodiment of the invention, the yoke includes radial grooves for each tooth of the stator, with electrical connections leaving free radial grooves between them, and phase terminals joined together at the outer periphery of the same tooth. These radial grooves allow for material savings in the yoke without interfering with the magnetic flux passing through it during operation. They also allow for easy mounting of the yoke to the walls of the housing when the yoke is segmented into different sections, each comprising a stator tooth. In practice, the radial grooves are designed, for example, to position and / or angle one of every two segments of the yoke to the walls of the housing by sliding into keys of complementary shapes (e.g., integrally formed as a single piece with the walls of the housing). For example, the radial grooves have dovetail portions to facilitate proper angular and axial retention of the yoke segments. Other shapes of the groove cross-section, such as rectangular, may be considered.

[0026] In addition, the phase terminals of the motor are assembled together, for example, in a terminal block located at the radial periphery of one of the teeth, which facilitates the electrical connection between the motor and one or more inverters.

[0027] According to another optional feature of the invention, the circular busbar includes conductive strips for each phase, the conductive strips being connected to the ends of the stator windings by forks located at angles on these conductive strips, all conductive strips being overmolded while allowing phase connections to electrical connectors to be free. This feature allows for easy connection of the winding ends to the circular busbar. The overmolding ensures mechanical strength between the conductive strips. For example, the phase connections of the circular busbar are non-overmolded areas, thereby allowing each electrical connection to be welded to one of these areas through one of its ends, each area located on a different conductive strip of the circular busbar.

[0028] Preferably, the motor according to the invention comprises two stators and two corresponding circular buses, the electrical connections of each stator being electrically connected to each other in a junction box including the phase terminals, the junction box being located in the outer peripheral portion of the motor, in a radial extension of the motor housing. For example, the motor housing is made of two parts, each part forming a housing half, each housing half housing one of the stators of the motor. The rotor is mounted between the two stators, and at the end of motor assembly, the two housing halves are screwed together around the periphery of the rotor. For example, the junction box is integrated within the radial extension of one of the housing halves, forming the other axially closed housing half.

[0029] The present invention also relates to an electric or hybrid electric vehicle comprising a motor according to the invention. The electric or hybrid electric vehicle according to the invention includes advantages similar to those of the axial flux motor according to the invention. Attached Figure Description

[0030] Other features and advantages of the invention will become more apparent, both in the description which follows and from several embodiments given with reference to the accompanying schematic diagrams for illustrative and non-limiting purposes, wherein:

[0031] Figure 1 A perspective view of an electric motor according to the invention, in one embodiment, is shown, wherein a housing half is not shown so as to expose the face of one of the stators of the motor intended to be fastened to the housing half.

[0032] Figure 2 It shows Figure 1 An axial cross-sectional view of a portion of the motor.

[0033] Figure 3 The stator teeth of the motor stator according to the invention are shown. In a variation of the invention, the teeth are wound and protrude from a yoke section through which electrical connections are arranged.

[0034] Figure 4 This is an orthogonal radial cross-sectional view of the yoke section of the motor according to the invention in another variation of the invention, from which stator teeth protrude. Detailed Implementation

[0035] according to Figure 1 The embodiment of the invention shown includes an axial flux motor 1 comprising two stators 3 and a rotor 5, the rotor 5 being fixed to a rotating shaft having a rotation axis X via a hub 54. The motor 1 is a three-phase motor, but it may alternatively include more or fewer than three power phases.

[0036] The motor 1, which has a generally disc-shaped design, includes a first housing 2_1 (reference). Figure 2 ) and a second housing 2_2, each housing housing one of the stators 3 of the motor. The two housings 2_1 and 2_2 are screwed together to form a complete housing or outer casing of the motor 1 by enclosing the rotor 5 mounted between the stators 3. Each of housings 2_1 and 2_2 includes an outer cylindrical wall and a generally planar wall 20 (in Figure 2 As can be seen in the image, screw channels are formed on the outer cylindrical wall to allow housings 2_1 and 2_2 to be fastened to each other. The generally planar wall 20 includes a central hole that allows a rotating shaft to pass through. Each planar wall 20 of housings 2_1 and 2_2 includes a bearing post that adjoins the central hole, and a bearing for receiving the rotating shaft is mounted in the bearing post.

[0037] The stators 3 in each of the housings 2_1 and 2_2 are structurally almost identical by being symmetrical to each other with respect to the main extension plane of the rotor, and therefore include many of the same parts marked the same in the figures.

[0038] Specifically, each stator 3 includes, for example, a yoke 4 made of magnets, and stator teeth 44 (one in... Figure 2 (As can be seen in the image) protrudes axially from the yoke 4 in the direction of rotor 5. Stator teeth 44 are fixed to the yoke 4 or formed simultaneously with the yoke 5. The yoke 5 can be a yoke formed by an assembly of magnetic sheets joined together, or a yoke formed by an assembly of sections made of magnets. Each section includes, for example, stator teeth 44 fixed to or integrally formed with the section, or the yoke 4 and stator teeth 44 are formed as a block. When stator teeth 44 are fixed to the yoke 4, the yoke 4 may be formed by wound magnetic sheets.

[0039] It should be understood here that the yoke 4 is a support covered by the stator teeth 44, thereby forming the base of these stator teeth, and is designed to allow magnetic flux to circulate within the yoke 4 during the operation of the motor 1.

[0040] The yoke 4 is typically shaped like a crown, extending radially from the inner radial periphery 46 of the yoke 4 to the outer radial periphery 48 of the yoke 4. Figure 1 The surface 41 of the yoke 4 shown, which extends in the orthogonal radial plane, is fastened to the planar wall 20 of the housings 2_1 and 2_2.

[0041] In this embodiment of the invention, the yoke 4 is segmented according to different stator teeth 44, and below the base of each stator tooth, a radial groove 42 is provided on the surface 41 extending from the inner radial periphery 46 of the yoke 4 to the outer radial periphery 48 of the yoke 4. These radial grooves 42 are used during the fastening of the yoke to the planar wall 20, particularly for positioning the segments of the yoke 4. For example, the corresponding positioning and / or fastening system uses a key system having a shape complementary to the shape of the cross-section of the radial groove 42. Once positioned, these segments are screwed onto the planar wall 20, for example.

[0042] The stator windings 8 are wound around the stator teeth 44. To facilitate the mounting of these stator windings 8 onto the stator teeth 44, such as... Figure 2 As shown, a winding insulation support 82 is nested on each stator tooth 44, and the stator winding 8 is pre-wound on the winding insulation support 82.

[0043] The end 80 of the stator winding 8 is connected to a circular bus 7, which is formed by four conductive strips 71, 73, 75, and 77 and is located radially within the boundary of the inner radial periphery 46 of the yoke 4, i.e., the circular bus 7 is closer to the axis of rotation than the inner radial periphery 46 of the yoke 4. These conductive strips are circular and form loops that are radially nested with each other. Alternatively, these loops may not be closed or may be arranged differently.

[0044] In this embodiment of the invention, each conductive bar 71, 73, 75, and 77 includes a fork 78, which is angledly distributed on the bars, and each fork 78 allows one end of one of the stator windings 8 to be welded thereto, thereby electrically connecting the end of the stator winding 8 to one of the conductive bars 71, 73, 75, and 77. The fork is metallic and is, for example, integrally formed with or welded to the conductive bars 71, 73, 75, and 77. Preferably, the material used for the fork and the conductive bar is copper, but other conductive materials can certainly be used.

[0045] For example, conductive strip 71 corresponds to the neutral connection of motor 1, and conductive strips 73, 75 and 77 carry the electrical phases of motor 1.

[0046] To ensure the mechanical strength of the circular busbar 7, especially the mechanical strength between the conductive strips, the latter is partially overmolded. The corresponding overmolded part 70 is... Figure 2 This can be seen in the text. Specifically, in this... Figure 2 In this configuration, the axial extension of the angled conductive strip 77 in the direction of the housing wall 20 is not covered by molding, so as to allow it to be connected to the electrical connector 34 by welding. Thus, this axial extension forms the connection 74.

[0047] The circular bus 7 has an opening at its center that allows the machine's rotating shaft to pass through. For example... Figure 2 As can be seen, the rotor hub 54 finds a radial space between the stator windings 8 so as to leave an axial air gap within one millimeter between the rotor 5 and the stator 3.

[0048] The rotor 5 is formed by magnetic poles 58 distributed at an angle around the axis of rotation. These magnetic poles 58 are inserted between branches of a composite fixed at the center of the hub 54. Hoops 52 clamp the magnetic poles 58 around the rotor 5 to counteract the centrifugal force acting on these magnetic poles 58 during the operation of the motor 1.

[0049] Back Figure 1 The cylindrical wall of the second housing 2_2 includes a radial extension that accommodates the junction box within the outer peripheral portion 9 of the motor 1. The terminal block includes three phase terminals 92, 94, and 96 corresponding to the power supply phases of the motor 1, and allows electrical connection of these three phase terminals 92, 94, and 96 to one or more inverters. For example, each of the phase terminals 92, 94, and 96 is in the form of a hole connector for passing a fastening screw.

[0050] The junction box is located radially on the outer periphery of one of the stator teeth 44. In particular, the junction box extends at an angle only on a limited portion of the motor 1, and the outer peripheral portion 9 does not radially cover more than two stator teeth 44.

[0051] For each power supply phase of motor 1, electrical connections 32, 34, or 36 electrically connect one of the phase terminals 92, 94, 96 to the corresponding phase connection 72, 74, 76 of the circular busbar 7. For example, each of these phase connections 72, 74, 76 corresponds to a position on the conductive strip of the circular busbar 7, allowing the corresponding electrical connection 32, 34, 36 to be soldered at that position. Of course, other types of connections can be used, such as threaded connections.

[0052] Electrical connectors 32, 34, or 36 herein take the form of conductive strips made of copper, covered with an electrically insulating material except at their ends. Alternatively, each of these conductive strips may be formed of conductive strands or conductive wires with a circular cross-section, made of copper or other metallic materials.

[0053] According to the invention, conductive connectors 32, 34 and 36 pass at least partially through channels radially through the yoke 4, that is, in this embodiment of the invention, through radial grooves 42.

[0054] Therefore, the conductive connectors 32, 34 and 36 have no additional axial volume, or have a very small additional axial volume, and the face 41 of the yoke 4 contacts the plane wall 20 of the housing when it is fastened to the plane wall 20 of the housing.

[0055] Preferably, after this fastening, there is no gap between the planar walls 20 of the housings 2_1, 2_2 and the planar surface of the face 41 on which the radial groove 42 is carved out. In the latter case, the conductive connectors 32, 34 and 36 cannot exceed the axial limit slightly from the radial groove 42.

[0056] exist Figure 3 and Figure 4In the presence of ribs 43 protruding on the face 41 of the yoke 42, the conductive connection is allowed to exceed the axial limit relative to the planar surface of the face 41 on which the radial groove 42 is carved out. When the motor 1 is assembled, these ribs 43 contact the planar walls 20 of the housings 2_1 and 2_2.

[0057] In this embodiment of the invention, the radial groove 42 has a dovetail-shaped cross section, but other cross sections are of course possible.

[0058] Furthermore, each radial groove 42 intersects the orthogonal symmetry plane of the stator tooth 44, that is, the plane that passes through the axis X of the rotation shaft and divides the stator tooth 44 into two equal parts. The intersection point of this orthogonal radial symmetry plane and the corresponding radial groove 42 is centered in the radial groove 42.

[0059] Figure 3 This illustrates the orthogonal radially symmetric plane P passing through the stator tooth 44 in a variant of the invention. Figure 3 In, with Figure 1 and Figure 2 The same components have the same reference numerals. In particular, the stator tooth 44 is provided with a stator winding 8 pre-wound on the winding support 82.

[0060] In this variant of the invention, the electrical connector 34 is partially inserted into a radial groove 42, which is arranged in the surface 41 of the yoke 4 opposite to the planar wall 20 of the housing.

[0061] The electrical connector 34 includes an electrically insulating overlay molding that surrounds its conductive portion except at its ends. This insulating overlay molding extends at an angle beyond the groove 42 in the axial gap between the face 41 of the yoke 4 and the planar walls 20 of the housings 2_1 and 2_2. This angular extension of the overlay molding is assembled simultaneously with the electrical connector 34 on the yoke 4. The electrical connectors 32, 34, and 36 are first assembled on the yoke 4 and welded to the circular busbar 7, and then assembled integrally onto the housings 2_1 and 2_2.

[0062] One end of the electrical connector 34, which is intended to be fastened to the phase terminal 94, is in the form of a hole that can receive a fastening screw, while the other end of the electrical connector 34 is bent to provide sufficient welding surface for the corresponding conductive strip of the circular busbar 7.

[0063] exist Figure 4 In another variant that can be seen, in which, with Figure 1 , Figure 2 and Figure 3 The same elements have the same reference numerals. The tooth 44 has fins 45, which extend at an angle on either side of the tooth 44 at the axial end of the tooth facing the rotor 5.

[0064] In Figure 4 In the diagram, the magnetic flux line F passing through the yoke 4 is shown as a black line. It can be seen that the magnetic flux line F does not pass through or barely passes through the radial groove 42, from its center to the bottom of the tooth 44.

[0065] In a variation of the invention, the radial grooves 42 do not intersect the orthogonal radial symmetry plane P, a situation difficult to achieve when the stator is manufactured by winding sheet metal (the so-called "slinky" method in English). In this case, the radial grooves 42 are equidistant from each other in the angular direction; however, this condition is not necessary for implementing the invention. Any groove 42 is feasible, provided that the shortest distance d1 between the groove and the adjacent winding notch (refer to...) Figure 4 It is basically equal to or greater than the thickness d2 of the yoke.

[0066] Return to Figure 1 Electrical connection 34 connects phase connection 74 to phase terminal 94 without any angular deviation. These three elements are centered on the orthogonal radial symmetry plane P of the same stator teeth 44.

[0067] On the first side of the orthogonal radially symmetric plane P, the electrical connection 36 connects the phase connection 76 to the phase terminal 96 by passing through the radial slot 42 located in the stator tooth 44, which is separated from the stator tooth 44 through which the electrical connection 34 passes by only one other stator tooth 44.

[0068] Symmetrically, on the second side of the orthogonal radial symmetry plane P, unlike the first side described above, the electrical connection 32 connects the phase connection 72 to the phase terminal 92 by passing through a radial slot 42 located in the stator tooth 44, which is separated from the stator tooth 44 through which the electrical connection 34 passes by only one other stator tooth 44.

[0069] In the angular direction, at least one radial groove 42 is left between every two grooves, without any electrical connection, allowing the segments of the yoke 4 to be correctly positioned on the planar wall 20 of the housing using these free radial grooves 42. This also ensures the feasibility of wiring electrical connections 32, 34, 36 in terms of radius of curvature.

[0070] Phase connectors 72 and 76 are located in the continuation of the radial grooves 42 of the receiving electrical connectors 32 and 36, so there is no angular deviation between the phase connectors 72, 76 and the outer radial periphery 48 of the yoke 4. On the other hand, the electrical connectors 32 and 36 have multiple bends outside the outer radial periphery 48 of the yoke 4 to reach the corresponding phase terminals 92 and 96.

[0071] like Figure 2As shown, the electrical connectors 32, 34, and 36 of each stator 3 meet in pairs at their ends where they are electrically connected to the phase terminals 92, 94, and 96. Thus, the motor 1 has a single terminal for each phase of the two stators 3, accessible via a cover 24 on a radial extension of the cylindrical wall of the housing 2_2.

[0072] Of course, the present invention is not limited to the examples just described, and many modifications can be made to these examples without departing from the scope of the invention. In particular, features of different variations can be combined to implement the present invention, as long as these variations are incompatible with each other.

Claims

1. An axial flux motor (1), comprising: Rotor (5), The stator (3) includes a yoke (4), teeth (44) protruding from the yoke (4) in the direction of the rotor (5), and stator windings (8) wound around the teeth (44). The yoke (4) has a crown shape that extends radially from the inner radial periphery (46) of the yoke (4) to the outer radial periphery (48) of the yoke (4). A housing (2_1, 2_2) that houses the stator (3), and a yoke (4) that is fixed to the wall (20) of the housing (2_1, 2_2). A circular bus (7) is connected to the end (80) of the stator winding (8), and the circular bus (7) is radially located on the side of the inner radial periphery (46) of the yoke (4). The motor (1) is characterized in that the yoke (4) includes a channel (42) on the side of the housing (2_1, 2_2), the channel (42) extending radially through the yoke (4) and extending from the radial inner periphery (46) of the yoke (4) to the radial outer periphery (48) of the yoke (4), and the motor (1) also includes electrical connectors (32, 34, 36) capable of electrically connecting the phase connectors (72, 74, 76) of the circular busbar (7) to the phase terminals (94, 96) located in the outer peripheral portion (9) of the motor (1), the electrical connectors (32, 34, 36) passing at least partially through the channel (42) extending radially through the yoke (4).

2. The axial flux motor (1) according to claim 1, wherein, The electrical connectors (32, 34, 36) are covered with electrical insulating material at least on the portion of the channel (42) that radially passes through the yoke (4).

3. The axial flux motor (1) according to claim 1 or 2, wherein, Each of the electrical connectors (32, 34, 36) connects the different phase connection portions (72, 74, 76) of the circular busbar (7) to the different phase terminals (92, 94, 96) located in the outer peripheral portion (9) of the motor (1) by passing through different channels (42) that radially pass through the yoke (4).

4. The axial flux motor (1) according to any one of claims 1 to 3, wherein, Each channel (42) that radially passes through the yoke (4) has a common orthogonal radial symmetry plane with the teeth (44) of the stator (3), or each channel has an orthogonal radial symmetry plane that is angularly located at the teeth (44) of the stator (3), and the distance between the channel (42) and the winding slot adjacent to the teeth (44) is greater than or equal to the thickness of the yoke (4).

5. The axial flux motor (1) according to claims 3 and 4, wherein, One of the phase terminals (94) and one of the phase connection portions (74) of the circular busbar (7) intersect the orthogonal radial symmetry plane (P), and one of the electrical connection portions (34) connects the phase terminal (94) to the phase connection portion (74) along the orthogonal radial symmetry plane (P).

6. The axial flux motor (1) according to any one of claims 1 to 5, wherein, The channel (42) that passes radially through the yoke (4) is a radial groove formed on the surface of the yoke (4) opposite to the wall (20) of the housing (2_1, 2_2).

7. The axial flux motor (1) according to claims 4 to 6, wherein, The yoke (4) includes radial grooves (42) for each tooth (44) of the stator, the electrical connectors (32, 34, 36) having free radial grooves (42) between them, and the phase terminals (92, 94, 96) being assembled together at the outer periphery of the same tooth (44).

8. The axial flux motor (1) according to any one of claims 1 to 7, wherein, The circular busbar (7) includes a conductive bar for each phase, which is connected to the end (80) of the stator winding (8) by forks (78) located at an angle on the conductive bars. All the conductive bars are covered and shaped to allow the phase connectors (72, 74, 76) connected to the electrical connectors (32, 34, 36) to be free.

9. An axial flux motor (1) according to any one of claims 1 to 8, comprising two stators (3) and two corresponding circular buses (7), wherein electrical connectors (32, 34, 36) of each stator (3) are electrically connected to each other in a junction box including the phase terminals (92, 94, 96), the junction box being located in the outer peripheral portion (9) of the motor (1) and in the radial extension of the housing (2_1, 2_2) of the motor (1).

10. An electric or hybrid electric vehicle, comprising a motor (1) according to any one of claims 1 to 9.

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