Stator assembly for an electric axial flux machine

Abstract

The invention relates to a stator assembly (1) for an electric axial flux machine (2), comprising a stator (3) and a stator receiving area (4) which is connected to the stator (3). The stator (3) has a disc-shaped stator yoke (5), from which a plurality of stator teeth (6) extend in an axial direction. At least one receiving groove (8) is formed in the stator yoke (5) on the stator yoke (5) face (7) facing the stator receiving area (4), said receiving groove being equipped with a rod-shaped welding bracket (9) which is connected to the stator receiving area (4).

Description

[0001] Stator arrangement for an electric axial flux machine

[0002] The present invention relates to a stator arrangement for an electric axial flux machine comprising a stator and a stator receptacle connected to the stator, wherein the stator has a disc-shaped stator yoke from which a plurality of stator teeth extend axially.

[0003] Electric motors are increasingly being used to power motor vehicles, creating alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday suitability of electric drives and also to provide users with the same level of driving comfort they are accustomed to.

[0004] A detailed description of an electric drive can be found in an article in the magazine ATZ 113th year, 05 / 2011, pages 360-365 by Erik Schneider, Frank Fickl, Bernd Cebulski and Jens Liebold with the title: Highly integrated and flexible electric drive unit for electric vehicles, which arguably represents the closest state of the art. This article describes a drive unit for one axle of a vehicle which comprises an electric motor which is arranged concentrically and coaxially to a bevel gear differential, with a switchable 2-speed planetary gear set being arranged in the power train between the electric motor and bevel gear differential, which is also positioned coaxially to the electric motor or the bevel gear differential or spur gear differential. The drive unit is very compact and, thanks to the switchable 2-speed planetary gear set, allows a good compromise between climbing ability, acceleration and energy consumption.Such drive units are also referred to as e-axles or electrically operated drive trains.

[0005] Axial flux machines are also increasingly being used in such electric axles. An axial flux machine is a dynamoelectric machine in which the magnetic flux between the rotor and stator runs parallel to the rotor's axis of rotation. Both the stator and rotor are often largely disc-shaped. Axial flux machines are particularly advantageous when the axial space available is limited in a given application. This is often the case, for example, with the electric drive systems for electric vehicles described above. In addition to the shortened axial length, another advantage of the axial flux machine is its comparatively high torque density. The reason for this is the larger air gap area available in a given installation space compared to radial flux machines.Furthermore, a smaller iron volume is required compared to conventional machines, which has a positive effect on the efficiency of the machine.

[0006] The object of the invention is to realize a simple and secure fastening of a stator of an axial flux machine to a stator holder.

[0007] This object is achieved by a stator arrangement for an electric axial flux machine comprising a stator and a stator receptacle connected to the stator, wherein the stator has a disk-shaped stator yoke from which a plurality of stator teeth extend axially, wherein on the side of the stator yoke facing the stator receptacle at least one receiving groove is formed in the stator yoke, in which a rod-shaped welding clamp is fixed, which in turn is connected to the stator receptacle.

[0008] The mounting groove in the stator yoke, in which the rod-shaped welding clamp is fixed, facilitates stator assembly, as the welding clamp can be connected to the stator yoke simply by sliding it into the mounting groove. The connection between the welding clamp and the stator mount allows the stator to be securely fixed and a reliable mechanical connection to be established. Furthermore, this allows for a range of different mounting options that can be adapted, for example, to different application scenarios for the axial flux machine. The rod-shaped welding clamp, which is connected to the stator mount, can also help dampen vibrations and noise, which can contribute to quieter operation of the axial flux machine.

[0009] The welding clamp can be connected to the stator holder by means of a material-to-material connection. Preferably, the welding clamp can be welded to the stator holder. Welding the welding clamp to the stator holder ensures a firm and strong connection between the two components. This improves the stability and rigidity of the stator assembly, which can help minimize unwanted vibrations and movements during operation. The direct connection between the welding clamp and the stator holder also allows heat to be efficiently dissipated from the stator winding to the stator holder. Furthermore, welding can eliminate the need for additional fastening elements such as screws or clamps, which can facilitate stator assembly.

[0010] Depending on the application, it may be advantageous to design an axial flux machine in an I-arrangement or an H-arrangement. In an I-arrangement, the rotor is arranged axially next to a stator or between two stators. In an H-arrangement, two rotors are arranged on opposite axial sides of a stator. The axial flux machine according to the invention is preferably configured in an I-arrangement.

[0011] In principle, it is also conceivable that the axial flux machine consists of exactly one stator and exactly one rotor.

[0012] In principle, it is also possible for a plurality of I-type and / or H-type rotor-stator configurations to be arranged axially adjacent to one another. In this context, it would also be possible to arrange several I-type rotor-stator configurations axially adjacent to one another. In particular, it is also preferable for the H-type and / or I-type rotor-stator configurations to be essentially identical in design, so that they can be combined in a modular manner to form an overall configuration. Such rotor-stator configurations can, in particular, be arranged coaxially to one another and connected to a common rotor shaft or to multiple rotor shafts.

[0013] The stator of the electric axial flux machine according to the invention preferably has a stator body with a plurality of stator windings arranged in the circumferential direction. The stator body can be formed as a single piece or segmented in the circumferential direction. The stator body can be formed from a stator core with a plurality of laminated electrical steel layers.

[0014] Alternatively, the stator body can also be made of a pressed soft magnetic material, such as the so-called SMC material (Soft Magnetic Compound).

[0015] The rotor of an electric axial flux machine can be designed, at least in part, as a laminated rotor. A laminated rotor is designed with layers in the radial direction. Alternatively, the rotor of an axial flux machine can also have a rotor carrier, which is equipped with magnetic sheets and / or SMC material and with magnetic elements designed as permanent magnets. Preferably, the rotor does not contain any other magnetically conductive materials besides the permanent magnets. In particular, the permanent magnets can also be accommodated in a rotor molded entirely or partially from a plastic.

[0016] A rotor shaft is a rotatably mounted shaft of an electrical machine to which the rotor or rotor body is rotationally fixedly coupled.

[0017] The electric axial flux machine may further comprise a control device. A control device, as can be used in the present invention, serves in particular for the electronic control and / or regulation of one or more technical systems of the electric axial flux machine.

[0018] A control device preferably has a wired or wireless signal input for receiving electrical signals, such as sensor signals. Furthermore, a control device preferably also has a wired or wireless signal output for transmitting electrical signals, in particular.

[0019] Control and / or regulation operations can be performed within the control device. It is particularly preferred that the control device comprises hardware configured to execute software. The control device preferably comprises at least one electronic processor for executing program sequences defined in the software.

[0020] The control device may further comprise one or more electronic memories in which the data contained in the signals transmitted to the control device can be stored and read out again. Furthermore, the control device may comprise one or more electronic memories in which data can be stored in a modifiable and / or non-modifiable manner.

[0021] A control device can comprise a plurality of control units, which are arranged, in particular, spatially separated from one another in the motor vehicle. Control units are also referred to as Electronic Control Units (ECUs) or Electronic Control Modules (ECMs) and preferably have electronic microcontrollers for performing computing operations for processing data, particularly preferably using software. The control units can preferably be networked with one another, enabling wired and / or wireless data exchange between control units. In particular, it is also possible to network the control units with one another via bus systems present in the motor vehicle, such as the CAN bus or LIN bus.

[0022] Most preferably, the control device has at least one processor and at least one memory, which in particular contains a computer program code, wherein the memory and the computer program code are configured, with the processor, to cause the control device to execute the computer program code.

[0023] The control unit can particularly preferably comprise power electronics for supplying current to the stator or rotor. Power electronics is preferably a combination of various components which control or regulate a current to the electrical machine, preferably including the peripheral components required for this purpose, such as cooling elements or power supplies. In particular, the power electronics contains one or more power electronics components which are designed to control or regulate a current. These are particularly preferably one or more power switches, e.g. power transistors. The power electronics particularly preferably has more than two, particularly preferably three separate phases or current paths, each with at least one separate power electronics component. The power electronics is preferably designed to provide a power output per phase with a peak power, preferably continuous power, of at least 1,000 W, preferably at least 10.000 W, particularly preferably at least 100,000 W.

[0024] The electric axial flux machine is particularly intended for use within a drive train of a hybrid or fully electric motor vehicle. In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km / h, preferably greater than 80 km / h, and in particular greater than 100 km / h can be achieved. The electric motor particularly preferably has an output greater than 50 kW, preferably greater than 100 kW, and in particular greater than 250 kW. It is further preferred that the electric machine provides operating speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, and most particularly preferably greater than 12,500 rpm. Most preferably, the electric machine has operating speeds between 5,000 and 15,000 rpm, and most preferably between 7,500 and 13,000 rpm.

[0025] The electric axial flux machine can preferably also be installed in an electrically operated axle drive train. An electric axle drive train of a motor vehicle comprises an electric axial flux machine and a transmission, wherein the electric axial flux machine and the transmission form a structural unit. In particular, it can be provided that the electric axial flux machine and the transmission are arranged in a common drive train housing. Alternatively, it would of course also be possible for the electric axial flux machine to have a motor housing and the transmission to have a transmission housing, wherein the structural unit can then be effected by fixing the transmission relative to the electric axial flux machine. This structural unit is occasionally also referred to as an e-axle. The electric axial flux machine can particularly preferably also be intended for use in a hybrid module.In a hybrid module, components and functional elements of a hybridized powertrain can be spatially and / or structurally combined and preconfigured, allowing a hybrid module to be integrated into a motor vehicle's powertrain in a particularly simple manner. In particular, an axial flux machine and a clutch system can be included.

[0026] According to an advantageous embodiment of the invention, a plurality of receiving slots, each with a welding clamp, can be arranged on the stator yoke. By arranging several receiving slots with welding clamps along the stator yoke, for example, the load can be evenly distributed, which can help minimize stresses and deformations in the stator arrangement and ensure more uniform mechanical stability. The plurality of receiving slots also enables flexible positioning of the welding clamps along the stator yoke and permits optimal adaptation to different requirements and geometries of the axial flux machine. It is also conceivable to use more or fewer welding clamps depending on the specific operating conditions of the axial flux machine in order to ensure optimal stability and strength.

[0027] According to a further preferred development of the invention, the receiving slots can also be aligned radially on the stator yoke. The radial alignment of the receiving slots allows the magnetic flux in the stator yoke to be guided particularly efficiently. Furthermore, radially arranged receiving slots reduce unwanted magnetic losses, such as eddy current losses and hysteresis losses in the stator yoke. A radial alignment of the receiving slots can also support a more even distribution of the magnetic flux in the stator yoke.

[0028] Furthermore, according to a similarly advantageous embodiment of the invention, it can be provided that the number of receiving slots corresponds to the number of stator teeth. If the number of receiving slots corresponds to the number of stator teeth, each welding clamp can be precisely positioned and fixed to a stator tooth, which enables precise placement of the welding clamps and promotes a particularly uniform distribution of forces and loads in the stator arrangement, helping to reduce unwanted vibrations, deformations, and stresses. Furthermore, such a symmetrical design can also contribute to balanced magnetic alignment and a uniform magnetic flux in the stator yoke.

[0029] According to another particularly preferred embodiment of the invention, the receiving grooves can be arranged equidistantly distributed over the circumference of the stator yoke. This can achieve the effect that the load is distributed particularly evenly between the welding clamps and the stator due to the equidistant distribution of the receiving grooves over the circumference of the stator yoke.

[0030] Furthermore, the invention can also be further developed such that the at least one receiving groove, preferably a plurality of receiving grooves, particularly preferably all receiving grooves, has / have a cross-sectional contour that forms an axial stop with a corresponding cross-sectional contour of the welding clamps, so that the welding clamps are arranged axially secured in the receiving grooves. This enables secure fastening of the welding clamps in the receiving grooves and prevents axial slipping or loosening during operation. The cross-sectional contour of the receiving grooves and the welding clamps also facilitates the assembly of the stator arrangement, since the axial stop enables precise placement and fixation of the welding clamps.

[0031] In a likewise preferred embodiment of the invention, it can also be provided that the welding clamp inserted in a receiving groove protrudes radially from an outer surface of the stator yoke and is radially secured by means of a caulking on the outer surface, and / or the welding clamp inserted in a receiving groove protrudes radially from an inner surface of the stator yoke and is radially secured by means of a caulking on the inner surface. This provides a strong mechanical connection between the welding clamp and the stator yoke that is resistant to vibrations, loads, and external influences.

[0032] In principle, it is also possible for the welding clamp to be firmly fixed in the receiving groove, particularly by welding. Welding the welding clamp into the receiving groove creates a firmly bonded connection that ensures high stability and strength. This enables reliable transmission of forces and loads between the welding clamp and the stator yoke.

[0033] The welding clamp can be secured in the receiving groove by means of at least one continuous weld seam. Preferably, the welding clamp is secured in the receiving groove by means of two continuous weld seams. This allows a particularly robust, integral connection to be formed between a welding clamp and a receiving groove.

[0034] The welding clamp can also be secured in the receiving groove by means of at least one interrupted weld seam. It may also be preferred for the welding clamp to be secured in the receiving groove by means of at least two interrupted weld seams. This can reduce the welding effort and, consequently, the manufacturing costs.

[0035] In principle, the welding clamp can also be fixed in the receiving groove by means of welding points, which can also help to increase the welding process speed and reduce production costs.

[0036] It may also be advantageous to further develop the invention such that the stator holder and the stator yoke are axially spaced from each other at least in sections, preferably completely, forming a cooling channel. The axial distance between the stator holder and the stator yoke creates a cooling channel that enables improved heat dissipation. This distance allows the unhindered flow of cooling medium, such as air or liquid, to efficiently dissipate the heat generated during operation. This contributes to better heat dissipation and thus to the prevention of overheating and an improved operating temperature of the axial flow machine.

[0037] For this purpose, for example, the welding clamp can protrude axially from the stator yoke, and the stator receptacle can abut axially against the welding clamp protruding from the stator yoke. It would also be possible for the stator receptacle to have contact sections protruding axially from it, which abut axially against the stator yoke. Furthermore, it would be conceivable for a separate spacer element to be arranged between the stator receptacle and the stator yoke.

[0038] According to a further preferred embodiment of the subject matter of the invention, insulation can be arranged at least on the contact surfaces between the welding clamp and the receiving groove. The insulation can be connected, for example, to the welding clamp and / or to the receiving groove. Particularly preferably, the insulation is implemented as a coating. The insulation can have a thermally insulating, electrically insulating, and / or magnetically insulating effect.

[0039] Finally, the invention can also be advantageously implemented such that the stator receptacle is connected to the welding clamp by means of a continuous weld seam running along the welding clamp, or the stator receptacle is connected to the welding clamp by means of a weld seam running intermittently along the welding clamp. This allows a particularly effective and robust material connection between the welding clamp and the stator receptacle to be realized. It is also conceivable in principle for the stator receptacle to be connected to the welding clamp by means of weld points running along the welding clamp.

[0040] According to a further preferred embodiment of the invention, it can be provided that the welding clamp protrudes radially from the outer circumferential surface of the stator yoke and has a first form-locking means on its first clamp section protruding from the stator yoke, via which first form-locking means the welding clamp is connected to the stator receptacle, and / or the welding clamp protrudes radially from the inner circumferential surface of the stator yoke and has a second form-locking means on its second clamp section protruding from the stator yoke, via which second form-locking means the welding clamp is connected to the stator receptacle. The use of form-locking means can promote simple assembly and disassembly of the stator from the stator receptacle. For example, it would be possible to fix the clamp sections to the stator receptacle by means of a screw connection, with the corresponding screw reaching through a form-locking means designed as an opening.Unlike a material-to-material connection, the screw connection would also be easy to remove, which could simplify maintenance or replacement of the electrical machine.

[0041] The welding clamp can also have a third form-locking means formed in the area of ​​the receiving groove, via which the welding clamp is connected to the stator holder, which can be advantageous in particular in radially limited installation space situations.

[0042] Preferably, the first form-locking means and / or the second form-locking means and / or the third form-locking means is / are an opening in the welding clamp, which is particularly easy to produce in terms of manufacturing technology.

[0043] The first form-locking means and / or the second form-locking means and / or the third form-locking means can preferably also comprise an internal thread, via which the stator receptacle is screwed to the welding clamp. It is further conceivable for a screw to pass through the opening, the thread of which protrudes axially from the opening in the direction of the stator receptacle and the screw head of which rests axially against the welding clamp, and the stator receptacle is secured to the screw by means of a nut.

[0044] The invention will be explained in more detail below with reference to figures without limiting the general inventive concept. It shows:

[0045] Figure 1 shows an axial flow machine in I-design in a schematic axial section,

[0046] Figure 2 shows a stator arrangement of an axial flow machine in an exploded view,

[0047] Figure 3 shows a stator arrangement of an axial flux machine in a perspective view,

[0048] Figure 4 shows a detailed view of a caulking of a welding clamp on the outer surface of the stator yoke,

[0049] Figure 5 shows a stator yoke with a welding clamp not yet inserted into a receiving groove in a perspective view,

[0050] Figure 6 shows a stator yoke with a welding clamp inserted into a receiving groove in a perspective view,

[0051] Figure 7 shows a stator yoke with a plurality of welding clamps inserted in a receiving groove in a perspective view,

[0052] Figure 8 shows a welding clamp inserted into a receiving groove in an unwelded and a welded state with the stator holder in a tangential sectional view,

[0053] Figure 9 shows five different embodiments of welding clamps in different cross-sectional contours, each in a tangential section,

[0054] Figure 10 shows five different embodiments of welding clamps in different cross-sectional contours, each with a cooling channel formed between the stator holder and the stator yoke, each in a tangential section view

[0055] Figure 11 shows a welding clamp coated with insulation in a free-standing and a mounting situation accommodated in the receiving groove,

[0056] Figure 12 shows a receiving groove coated with insulation in a free-standing welding clamp with a welding clamp accommodated in the receiving groove,

[0057] Figure 13 shows five different embodiments of the stator arrangement with different weld seams for fixing the welding clamp in the respective receiving groove, each in a tangential section,

[0058] Figure 14 shows various embodiments of weld seams and welding points for fixing the welding clamp in the respective receiving groove in a tangential section,

[0059] Figure 15 shows a first embodiment of a welding clamp with sections projecting radially from the groove in a perspective view,

[0060] Figure 16 shows the first embodiment of a welding clamp with sections projecting radially from the groove with a riveted connection in an unassembled and an assembled state in an axial sectional view,

[0061] Figure 17 shows a second embodiment of a welding clamp with sections projecting radially from the groove in a perspective view, Figure 18 shows various screw connections for fixing the stator to the stator holder in an axial sectional view,

[0062] Figure 19 shows a motor vehicle with an electric drive train in a schematic representation.

[0063] Figure 1 shows an axial flux machine 2 in I-configuration with two axially spaced disc-shaped stators 3, between which the disc-shaped rotor 41 is rotatably mounted on the rotor shaft 42. The stators 3 are fixed to a stator holder 4, which is part of a motor housing of the axial flux machine 2.

[0064] Figures 2-3 show a stator arrangement 1 for the electric axial flux machine 2 comprising a stator 3 and a stator receptacle 4 connected to the stator 3, wherein the stator 3 has a disk-shaped stator yoke 5 from which a plurality of stator teeth 6 extend axially. On the side 7 of the stator yoke 5 facing the stator receptacle 4, a plurality of receiving grooves 8 are formed in the stator yoke 5, in each of which a rod-shaped welding clamp 9 is fixed, which in turn is connected to the stator receptacle 4.

[0065] Figure 4 shows that the welding clamp 9 inserted in a receiving groove 8 protrudes radially from an outer surface 13 of the stator yoke 5 and is radially secured to the outer surface 13 by means of a caulking 35. Even if not shown in Figure 4, it is nevertheless possible for the welding clamp 9 inserted in a receiving groove 8 to also protrude radially from an inner surface 14 of the stator yoke 5 and to be radially secured to the inner surface 14 by means of a caulking.

[0066] As can be clearly seen from Figures 5-7, the receiving grooves 8 are formed on the stator yoke 5, distributed radially and equidistantly over the circumference of the stator yoke 5. In the example shown, the number of receiving grooves 8 corresponds to the number of stator teeth 6. As can be seen from Figure 8, the welding clamp 9 can be welded to the stator holder 4 and have a corresponding weld seam 22. The stator holder 4 can be connected to the welding clamp 9 by means of a continuous or interrupted weld seam 22 running along the welding clamp 9. It would also be possible to connect the stator holder 4 to the welding clamp 9 by means of weld points 23 running along the welding clamp 9.

[0067] Figure 9 shows various cross-sectional shapes of the welding clamps 9 and the corresponding receiving grooves 8. What all the examples shown have in common is that the receiving groove 8 has a cross-sectional contour 10 which, together with a corresponding cross-sectional contour 11 of the welding clamps 9, forms an axial stop 12, so that the welding clamps 9 are arranged axially secured in the receiving grooves 8. In figure a, the welding clamp has a trapezoidal cross-sectional profile 11 and the receiving groove 8 a dovetail-like cross-sectional contour 10. In design variant b, the cross-sectional profiles 10, 11 have a T-shaped contour. Cuboid-shaped cross-sectional profiles 10, 11 can be seen in figure c. Circular cross-sectional profiles 10, 11 are also conceivable, as sketched in figure d.The cross-sectional contour 11 of the welding clamps 9 can also be T-shaped, with a welding projection 36 extending from the base of the T-shaped contour.

[0068] Figure 10 shows various embodiments of a stator arrangement 1 in which the stator receptacle 4 and the stator yoke 5 are at least partially axially spaced from one another to form a cooling channel 15. In Figures a and c, the welding clamp 9 protrudes axially from the stator yoke 5, with the stator receptacle 4 then axially abutting the welding clamp 9 protruding from the stator yoke 5. In Figure e, the stator receptacle 4 has contact sections 16 protruding axially therefrom, which axially abut the stator yoke 5. It is also possible for a separate spacer element 17 to be arranged between the stator receptacle 4 and the stator yoke 5, as can be seen in Figures b and d of Figure 10. A cooling fluid, such as air or cooling oil, can flow through the cooling channel 15.

[0069] It is evident from Figures 11-12 that an insulation 19 is arranged at least on the contact surfaces 18 between the welding clamp 9 and the receiving groove 8. Figure 11 shows an embodiment in which the insulation 19 is connected to the welding clamp 9, while Figure 12 shows an embodiment in which the insulation 19 is connected to the receiving groove 8.

[0070] Figure 13 shows a number of further embodiments of the stator assembly 1, in which the welding clamp 9 is firmly fixed in the receiving groove 8, in particular by welding. In this case, the stator receptacle 4 can have a stamped portion 37, which serves to dissipate welding fumes.

[0071] As can be clearly seen from Figure 14, the welding clamp 9 can be fixed in the receiving groove 8 by means of two parallel, continuous weld seams 20 (Figure a). The welding clamp 9 can also be fixed in the receiving groove 8 by means of two parallel, interrupted weld seams 20, whereby the interrupted weld seams 20 can also be arranged offset from one another, as can be seen in Figure c of Figure 14. It is also possible for the welding clamp 9 to be fixed in the receiving groove 8 by means of welding points 21, which is shown in Figure d.

[0072] Figures 15-17 show further embodiments of a stator arrangement 1, in which the welding clamp 9 protrudes radially from the outer circumferential surface 13 of the stator yoke 5 and has a first form-locking means 25 on its first clamp section 24 protruding from the stator yoke 5, via which first form-locking means 25 the welding clamp 9 is connected to the stator receptacle 4. In an analogous manner, the welding clamp 9 also protrudes radially from the inner circumferential surface 14 of the stator yoke 5 and has a second form-locking means 27 on its second clamp section 26 protruding from the stator yoke 5, via which second form-locking means 27 the welding clamp 9 is connected to the stator receptacle 4. The welding clamp 9 is secured in the receptacle groove 8 via the weld seams 20. The first form-locking means 25 and the second form-locking means 27 are designed as a circular opening 28 in the welding clamp 9.

[0073] Figure 16 shows an embodiment in which the stator holder 4 has a rivet 38 extending in the axial direction, which passes through the opening 28 and is then formed into a riveted connection, so that the welding clamp 9 and the stator yoke 5 are fixed to the stator holder 4.

[0074] Figure 17 shows a slightly modified version of the welding clamp 9 known from Figure 16, in which the form-locking means 25, 27 are designed as semicircular openings 28, against each of which a bolt 39 of the stator holder 4 rests.

[0075] As can be clearly seen from Figure 18, the welding clamp 9 can have a third form-locking means 29 formed in the region of the receiving groove 8, via which the welding clamp 9 is connected to the stator receptacle 4. The third form-locking means 29 is formed as an opening 28 in the welding clamp 9. In the embodiments shown in Figures a and b, the third form-locking means 29 has an internal thread 30, via which the stator receptacle 4 is screwed to the welding clamp 9. In this case, the stator yoke 5 can have a recess 40 that is positioned in alignment with the screw 31.

[0076] In illustration c of Figure 18, an embodiment can be seen in which the opening 28 is penetrated by a screw 31, the thread 32 of which projects axially from the opening 28 in the direction of the stator holder 4 and the screw head 33 of which bears axially against the welding clamp 9, and wherein the stator holder 4 is secured to the screw 31 by means of a nut 34.

[0077] Figure 19 shows a motor vehicle 44 with an axial flux machine 2 in a drive train 43.

[0078] The invention is not limited to the embodiments illustrated in the figures. The above description is therefore not to be considered restrictive, but rather explanatory. The following claims are to be understood in such a way that a stated feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. Where the claims and the above description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing a priority.

[0079] List of reference symbols

[0080] 1 Stator arrangement

[0081] 2 axial flux machine

[0082] 3 Stator

[0083] 4 Stator holder

[0084] 5 Stator yoke

[0085] 6 stator teeth

[0086] 7 Page

[0087] 8 mounting groove

[0088] 9 welding clamp

[0089] 10 Cross-sectional contour

[0090] 11 Cross-sectional contour

[0091] 12 stops

[0092] 13 Shell surface

[0093] 14 Shell surface

[0094] 15 cooling channels

[0095] 16 plant sections

[0096] 17 Spacer element

[0097] 18 contact surfaces

[0098] 19 Insulation

[0099] 20 Weld seam

[0100] 21 welding points

[0101] 22 Weld seam

[0102] 23 welding points

[0103] 24 bracket section

[0104] 25 form-locking devices

[0105] 26 bracket section

[0106] 27 Form-locking devices

[0107] 28 Opening

[0108] 29 Form-locking devices

[0109] 30 internal threads

[0110] 31 Screw

[0111] 32 Thread 33 Screw head

[0112] 34 Mother

[0113] 35 Caulking

[0114] 36 Weld hump 37 Embossing

[0115] 38 rivets

[0116] 39 bolts

[0117] 40 recess

[0118] 41 Rotor 42 Rotor shaft

[0119] 43 Drivetrain

[0120] 44 Motor vehicle

Claims

Claims 1. Stator arrangement (1) for an electrical axial flux machine (2) comprising a stator (3) and a stator receptacle (4) connected to the stator (3), wherein the stator (3) has a disc-shaped stator yoke (5) from which a plurality of stator teeth (6) extend axially, characterized in that on the side (7) of the stator yoke (5) facing the stator receptacle (4), at least one receiving groove (8) is formed in the stator yoke (5), in which a rod-shaped welding clamp (9) is fixed, which in turn is connected to the stator receptacle (4).

2. Stator arrangement (1) according to claim 1, characterized in that a plurality of receiving grooves (8), each with a welding clamp (9), is arranged on the stator yoke (5).

3. Stator arrangement (1) according to claim 1 or 2, characterized in that the receiving grooves (8) are aligned radially on the stator yoke (5).

4. Stator arrangement (1) according to claim 2 or 3, characterized in that the number of receiving grooves (8) corresponds to the number of stator teeth (6).

5. Stator arrangement (1) according to claim 3 or 4, characterized in that the receiving grooves (8) are arranged equidistantly over the circumference of the stator yoke (5).

6. Stator arrangement (1) according to one of the preceding claims, characterized in that the at least one receiving groove (8), preferably a plurality of receiving grooves (8), particularly preferably all receiving grooves (8) has / have a cross-sectional contour (10) which, with a corresponding cross-sectional contour (11) of the welding clamps (9), forms an axial stop (12), so that the welding clamps (9) are arranged in an axially secured manner in the receiving grooves (8).

7. Stator arrangement (1) according to one of the preceding claims, characterized in that the welding clamp (9) inserted in a receiving groove (8) protrudes radially from an outer circumferential surface (13) of the stator yoke (5) and is radially secured by means of a caulking on the outer circumferential surface (13) and / or the welding clamp (9) inserted in a receiving groove (8) protrudes radially from an inner circumferential surface (14) of the stator yoke (5) and is radially secured by means of a caulking on the inner circumferential surface (14).

8. Stator arrangement (1) according to one of the preceding claims, characterized in that the stator receptacle (4) and the stator yoke (5) are axially spaced from one another at least in sections, preferably completely, to form a cooling channel (15).

9. Stator arrangement (1) according to one of the preceding claims, characterized in that an insulation (19) is arranged at least on the contact surfaces (18) between the welding clamp (9) and the receiving groove (8).

10. Stator arrangement (1) according to one of the preceding claims, characterized in that the stator receptacle (4) is connected to the welding clamp (9) by means of a continuous weld seam (22) running along the welding clamp (9) or the stator receptacle (4) is connected to the welding clamp (9) by means of a weld seam (22) running intermittently along the welding clamp (9).

11. Stator arrangement (1) according to one of the preceding claims, characterized in that the welding clamp (9) protrudes radially from the outer circumferential surface (13) of the stator yoke (5) and has a first form-locking means (25) on its first clamp section (24) protruding from the stator yoke (5), via which first form-locking means the welding clamp (9) is connected to the stator receptacle (4), and / or the welding clamp (9) protrudes radially from the inner circumferential surface (14) of the stator yoke (5) and has a second form-locking means (27) on its second clamp section (26) protruding from the stator yoke (5), via which second form-locking means the welding clamp (9) is connected to the stator receptacle (4).

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