Stator arrangement for an electric axial flux machine

Abstract

The invention relates to a stator arrangement (1) for an 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, wherein at least one receiving groove (8) is formed in the stator yoke (5) on the side (7) of the stator receptacle (4) facing the stator receptacle (4), in which a rod-shaped welding clamp (9) is fixed, which in turn is connected to the stator receptacle (4).

Description

[0001] 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 disk-shaped stator yoke from which a plurality of stator teeth extend axially.

[0002] Electric motors are increasingly being used in motor vehicles to provide alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday usability of electric drives and to offer users the familiar driving comfort.

[0003] A detailed description of an electric drive system can be found in an article in the journal ATZ, Volume 113, 05 / 2011, pages 360-365, by Erik Schneider, Frank Fickl, Bernd Cebulski, and Jens Liebold, entitled: "Highly Integrated and Flexible Electric Drive Unit for E-Vehicles," which likely represents the next state of the art. This article describes a drive unit for one axle of a vehicle, comprising an electric motor arranged concentrically and coaxially to a bevel gear differential. A switchable two-speed planetary gear set is located in the power train between the electric motor and the bevel gear differential, also positioned coaxially to the electric motor and the bevel or spur gear differential. The drive unit has a very compact design and, thanks to the switchable two-speed planetary gear set, allows for 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.

[0004] Axial flux machines are increasingly being used in such e-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. Often, both the stator and rotor are largely disk-shaped. Axial flux machines are particularly advantageous when the available axial installation space is limited in a given application. This is frequently the case, for example, with both of the electric drive systems for electric vehicles described earlier. In addition to the reduced axial length, another advantage of the axial flux machine lies in its comparatively high torque density. This is due to the larger air gap area available within a given installation space compared to radial flux machines.Furthermore, a smaller volume of iron is required compared to conventional machines, which has a positive effect on the efficiency of the machine.

[0005] The object of the invention is to provide a simple and secure fastening of a stator of an axial flux machine to a stator mount.

[0006] This problem is solved 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 at least one receiving groove is formed in the stator yoke on the side of the stator receptacle facing the stator receptacle, in which a rod-shaped welding clamp is fixed, which in turn is connected to the stator receptacle.

[0007] The groove in the stator yoke, in which the rod-shaped welding clamp is fixed, simplifies stator assembly, as the welding clamp can be easily connected to the stator yoke by simply sliding it into the groove. The connection between the welding clamp and the stator mount ensures secure stator fixation and a reliable mechanical connection. Furthermore, this allows for a variety of mounting options, which can be adapted to different operating scenarios of the axial flux machine. The rod-shaped welding clamp connected to the stator mount can also contribute to damping vibrations and noise, resulting in quieter operation of the axial flux machine.

[0008] The welding clamp can be connected to the stator mount by means of a metallurgical bond. Preferably, the welding clamp can be welded to the stator mount. Welding the clamp to the stator mount ensures a strong and secure connection between the two components. This results in improved stability and rigidity of the stator assembly, which can help minimize unwanted vibrations and movement during operation. Furthermore, the direct connection between the welding clamp and the stator mount allows for efficient heat dissipation from the stator winding to the stator mount. Additionally, welding eliminates the need for extra fasteners such as screws or clamps, which can simplify stator assembly.

[0009] Depending on the application, it can 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.

[0010] In principle, it is also conceivable that the axial flux machine consists of exactly one stator and exactly one rotor.

[0011] In principle, it is also possible for multiple rotor-stator configurations of I-type and / or H-type to be arranged axially side by side. It would also be possible in this context to arrange several I-type rotor-stator configurations side by side in the axial direction. In particular, it is also preferred that the H-type and / or I-type rotor-stator configurations are essentially identical, so that they can be assembled modularly into a complete configuration. Such rotor-stator configurations can, in particular, be arranged coaxially to one another and be connected to a common rotor shaft or to multiple rotor shafts.

[0012] The stator of the electric axial flux machine according to the invention preferably comprises a stator body with several circumferentially arranged stator windings. 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 lamination stack with several laminated layers of electrical steel. Alternatively, the stator body can also be formed from a pressed soft magnetic material, such as the so-called SMC material (Soft Magnetic Compound).

[0013] The rotor of an electric axial flux machine can be designed, at least in part, as a laminated rotor. A laminated rotor is formed with layers in the radial direction. Alternatively, the rotor of an axial flux machine can also have a rotor carrier that is appropriately equipped with magnetic laminations and / or SMC material and with magnetic elements designed as permanent magnets. Preferably, the rotor has no other magnetically conductive materials besides the permanent magnets. In particular, the permanent magnets can also be mounted in a rotor that is molded entirely or partially from a plastic.

[0014] A rotor shaft is a rotatably mounted shaft of an electric machine, to which the rotor or rotor body is coupled in a rotationally fixed manner.

[0015] The electric axial flux machine can further comprise a control device. A control device such as that which 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.

[0016] A control device has, in particular, a wired or wireless signal input for receiving signals, especially electrical signals, such as sensor signals. Furthermore, a control device also preferably has a wired or wireless signal output for transmitting signals, especially electrical signals.

[0017] Control operations and / or regulation operations can be performed within the control unit. It is particularly preferred that the control unit comprises hardware configured to execute software. Preferably, the control unit includes at least one electronic processor for executing program sequences defined in software.

[0018] The control unit may also include one or more electronic storage devices in which the data contained in the signals transmitted to the control unit can be stored and read back. Furthermore, the control unit may include one or more electronic storage devices in which data can be stored in a modifiable and / or immutable manner.

[0019] A control system can comprise multiple control units, which are preferably arranged spatially separated from one another within the vehicle. Control units are also referred to as Electronic Control Units (ECUs) or Electronic Control Modules (ECMs) and preferably have electronic microcontrollers for performing calculations and processing data, particularly preferably by means of software. The control units can preferably be networked with each other, enabling wired and / or wireless data exchange between them. In particular, it is also possible to network the control units with each other via bus systems present in the vehicle, such as CAN bus or LIN bus.

[0020] Particularly preferably, the control device has at least one processor and at least one memory, which in particular contains 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.

[0021] The control unit can particularly preferably include power electronics for supplying current to the stator or rotor. Power electronics are preferably a combination of various components that control or regulate a current to the electric machine, preferably including the necessary peripheral components such as cooling elements or power supplies. In particular, the power electronics contain one or more power electronic components configured for controlling or regulating a current. These are particularly preferably one or more power switches, e.g., power transistors. The power electronics particularly preferably have more than two, and more preferably three, separate phases or current paths, each with at least one dedicated power electronic component. The power electronics are preferably designed to provide a power output per phase with a peak power, preferably continuous power, of at least 1,000 W, and more preferably at least 10 W.000 W is particularly preferred for controlling or regulating at least 100,000 W.

[0022] The electric axial flux machine is intended for use within the powertrain of a hybrid or fully electric motor vehicle. In particular, the electric machine is dimensioned to enable vehicle speeds greater than 50 km / h, preferably greater than 80 km / h, and especially greater than 100 km / h. The electric motor preferably has a power output greater than 50 kW, preferably greater than 100 kW, and especially 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 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.

[0023] 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 single structural unit. It can be provided, in particular, 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 a transmission housing, whereby the structural unit is then achieved by fixing the transmission to the electric axial flux machine. This structural unit is occasionally also referred to as an e-axle.

[0024] The electric axial flux machine can particularly preferably also be designed for use in a hybrid module. In a hybrid module, structural and functional elements of a hybridized powertrain can be spatially and / or structurally combined and preconfigured, so that a hybrid module can be integrated into a motor vehicle powertrain in a particularly simple manner. In particular, an axial flux machine and a coupling system can be present.

[0025] According to an advantageous embodiment of the invention, a plurality of receiving grooves, each with a welding clamp, can be arranged on the stator yoke. By arranging several receiving grooves with welding clamps along the stator yoke, the load can be distributed evenly, which can help to minimize stresses and deformations in the stator assembly and ensure more uniform mechanical stability. Furthermore, the plurality of receiving grooves allows for 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, to ensure optimal stability and strength.

[0026] According to a further preferred embodiment of the invention, the receiving grooves can also be arranged radially on the stator yoke. This radial orientation of the receiving grooves allows for particularly efficient guidance of the magnetic flux within the stator yoke. Furthermore, radially arranged receiving grooves reduce undesirable magnetic losses, such as eddy current losses and hysteresis losses within the stator yoke. A radial orientation of the receiving grooves can also promote a more uniform distribution of the magnetic flux within the stator yoke.

[0027] Furthermore, according to another advantageous embodiment of the invention, the number of receiving grooves can correspond to the number of stator teeth. If the number of receiving grooves corresponds to the number of stator teeth, each welding clamp can be precisely positioned and fixed to a stator tooth. This enables precise placement of the welding clamps and promotes a particularly uniform distribution of forces and loads in the stator assembly, helping to reduce unwanted vibrations, deformations, and stresses. Moreover, such a symmetrical design can also contribute to a balanced magnetic alignment and a uniform magnetic flux in the stator yoke.

[0028] According to a further particularly preferred embodiment of the invention, the receiving grooves can be arranged equidistantly distributed around the circumference of the stator yoke. This achieves, in particular, the effect that the load is distributed especially evenly between the welding clamps and the stator due to the equidistant distribution of the receiving grooves around the circumference of the stator yoke.

[0029] Furthermore, the invention can also be further developed in such a way that the at least one receiving groove, preferably a plurality of receiving grooves, and particularly preferably all receiving grooves have a cross-sectional contour which, together with a corresponding cross-sectional contour of the welding clamps, forms an axial stop, so that the welding clamps are axially secured in the receiving grooves. This enables secure fastening of the welding clamps in the receiving grooves and prevents axial slippage or loosening during operation. The cross-sectional contour of the receiving grooves and the welding clamps also facilitates the assembly of the stator assembly, since the axial stop enables precise placement and fixing of the welding clamps.

[0030] In a further preferred embodiment of the invention, the welding clamp inserted in a receiving groove may also protrude radially from an outer surface of the stator yoke and be radially secured to the outer surface by means of a stapling, and / or the welding clamp inserted in a receiving groove may protrude radially from an inner surface of the stator yoke and be radially secured to the inner surface by means of a stapling. This provides a strong mechanical connection between the welding clamp and the stator yoke, which is resistant to vibrations, loads, and external influences.

[0031] It is also possible, in principle, for the welding clamp to be fixed in the mounting groove by means of a material bond, particularly by welding. Welding the clamp in the mounting groove creates a material bond that ensures high stability and strength. This enables reliable transmission of forces and loads between the welding clamp and the stator yoke.

[0032] The welding clamp can be fixed in the receiving groove by means of at least one continuous weld. Preferably, the welding clamp is fixed in the receiving groove by means of two continuous welds. This allows for a particularly robust, material-bonded connection between the welding clamp and the receiving groove.

[0033] The welding clamp can also be fixed in the receiving groove by means of at least one interrupted weld. It is also preferable for the welding clamp to be fixed in the receiving groove by means of at least two interrupted welds. This reduces the welding effort and consequently the manufacturing costs.

[0034] The welding clamp can also be fixed in the receiving groove by means of spot welds, which can also help to increase the welding process speed and reduce manufacturing costs.

[0035] It can also be advantageous to further develop the invention such that the stator mount and the stator yoke are axially spaced apart from each other, at least partially, preferably completely, forming a cooling channel. The axial distance between the stator mount and the stator yoke creates a cooling channel that enables improved heat dissipation. This distance allows the unimpeded 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 preventing overheating and improving the operating temperature of the axial flux machine.

[0036] For example, the welding clamp could protrude axially from the stator yoke, and the stator mount could rest axially against the welding clamp protruding from the stator yoke. It would also be possible for the stator mount to have axially protruding contact sections that rest axially against the stator yoke. Furthermore, it would be conceivable for a separate spacer element to be arranged between the stator mount and the stator yoke.

[0037] According to a further preferred embodiment of the invention, insulation may be provided at least on the contact surfaces between the welding clamp and the receiving groove. The insulation may, for example, be connected to the welding clamp and / or to the receiving groove. The insulation is particularly preferably designed as a coating. The insulation may be thermally insulating, electrically insulating, and / or magnetically insulating.

[0038] Finally, the invention can also be advantageously implemented such that the stator mount is connected to the welding clamp by means of a continuous weld seam running along the welding clamp, or the stator mount is connected to the welding clamp by means of a weld seam running intermittently along the welding clamp. This allows for a particularly effective and robust material-bonded connection between the welding clamp and the stator mount. It is also conceivable, in principle, that the stator mount is connected to the welding clamp by means of spot welds running along the welding clamp.

[0039] According to a further preferred embodiment of the invention, the welding clamp can project radially from the outer surface of the stator yoke and have a first positive locking element on its first clamp section projecting from the stator yoke, by means of which the welding clamp is connected to the stator mount, and / or the welding clamp can project radially from the inner surface of the stator yoke and have a second positive locking element on its second clamp section projecting from the stator yoke, by means of which the welding clamp is connected to the stator mount. The use of positive locking elements can facilitate easy assembly and disassembly of the stator from the stator mount. For example, it would be possible to fix the clamp sections to the stator mount by means of a screw connection, with the corresponding screw passing through a positive locking element designed as an opening.Unlike a material-bonded connection, the screw connection could also be easily loosened again, which can simplify the maintenance or replacement of the electrical machine.

[0040] The welding clamp can also have a third form-locking element formed in the area of ​​the receiving groove, via which the welding clamp is connected to the stator mounting, which can be particularly advantageous in radially limited installation space situations.

[0041] Preferably, the first positive locking element and / or the second positive locking element and / or the third positive locking element is an opening in the welding clamp, which is particularly easy to manufacture.

[0042] The first positive locking element and / or the second positive locking element and / or the third positive locking element may preferably also include an internal thread via which the stator mount is screwed to the welding clamp. It is further conceivable that the opening is penetrated by a screw whose thread projects axially from the opening towards the stator mount and whose screw head rests axially against the welding clamp, and wherein the stator mount is secured to the screw by means of a nut.

[0043] The invention will now be explained in more detail with reference to figures, without limiting the general concept of the invention.

[0044] It shows: Fig. 1. An axial flux machine in I-configuration in a schematic axial section view, Fig. 2. An exploded view of a stator arrangement of an axial flux machine. Fig. 3 a stator arrangement of an axial flux machine in a perspective view, Fig. 4 a detailed view of a weld clamp being riveted to the outer surface of the stator yoke, Fig. 5 a stator yoke with a welding clamp not yet inserted into a receiving groove in a perspective view, Fig. 6 a stator yoke with a welding clamp inserted in a receiving groove in a perspective view, Fig. 7 a stator yoke with a multitude of welding clamps inserted in a single receiving groove in a perspective view, Fig. 8 a welding clamp inserted in a receiving groove in a state unwelded and welded to the stator mounting in a tangential section view, Fig. 9 five different designs of welding clamps in different cross-sectional contours, each in a tangential section view, Fig. 10 five different embodiments of welding clamps in different cross-sectional contours, each with a cooling channel formed between the stator mount and the stator yoke, shown in a tangential section view Fig. 11 a welding clamp coated with insulation in a freestanding and a mounting situation taken up in the receiving groove, Fig. 12 a receiving groove coated with an insulation in a freestanding and with a welding clamp held in the receiving groove, Fig. 13 Five different embodiments of the stator arrangement with different weld seams for fixing the welding clamp in the respective receiving groove, each shown in a tangential section view, Fig. 14 different designs of welds and weld points for fixing the welding clamp in the respective receiving groove, each in a tangential section view, Fig. 15 A first embodiment of a welding clamp with sections projecting radially from the groove in a perspective view, Fig. 16 the first embodiment of a welding clamp with sections projecting radially from the groove with a rivet connection in an unassembled and an assembled state in an axial section view, Fig. 17 a second embodiment of a welding clamp with sections projecting radially from the groove in a perspective view, Fig. 18 different screw connections for fixing the stator to the stator mount, each shown in an axial sectional view. Fig. 19 A motor vehicle with an electric powertrain in a schematic representation.

[0045] Fig. Figure 1 shows an axial flux machine 2 in I-configuration with two axially spaced disk-shaped stators 3, between which the disk-shaped rotor 41 is rotatably mounted on the rotor shaft 42. The stators 3 are fixed to a stator mount 4, which is part of a motor housing of the axial flux machine 2.

[0046] The Fig. 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.

[0047] In the Fig. 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 rivet 35. Even if it is in the Fig. Although not shown in 4, it is still possible that the welding clamp 9 inserted in a receiving groove 8 also protrudes radially from an inner surface 14 of the stator yoke 5 and is secured radially to the inner surface 14 by means of a rivet.

[0048] How to use the Fig. As can be clearly seen in Figures 5-7, the receiving grooves 8 are radially and equidistantly distributed around 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.

[0049] How to get out of the Fig. If the weld clamp 9 is detected, it can be welded to the stator mount 4 and have a corresponding weld seam 22. The stator mount 4 can be connected to the weld clamp 9 by means of a continuous or interrupted weld seam 22 running along the weld clamp 9. It would also be possible to connect the stator mount 4 to the weld clamp 9 by means of spot welds 23 running along the weld clamp 9.

[0050] In the Fig. Figure 9 shows various cross-sectional shapes of the welding clamps 9 and the corresponding receiving grooves 8. All the examples shown have in common 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 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 has a dovetail-shaped cross-sectional contour 10. In embodiment b, the cross-sectional profiles 10, 11 have a T-shaped contour. Cuboid cross-sectional profiles 10, 11 are shown in the Fig. to be seen. Circular cross-sectional profiles 10,11 are also conceivable, as shown in the Fig. The cross-sectional contour 11 of the welding clamps 9 can also be T-shaped, with a welding boss 36 extending out from the base of the T-shaped contour.

[0051] Fig. Figure 10 shows various embodiments of a stator arrangement 1 in which the stator mount 4 and the stator yoke 5 are axially spaced apart from each other, at least in sections, forming a cooling channel 15. In Figures a and c, the welding clamp 9 projects axially from the stator yoke 5, with the stator mount 4 then bearing axially against the welding clamp 9 projecting from the stator yoke 5. In Figure e, the stator mount 4 has axially projecting contact sections 16 that bear axially against the stator yoke 5. It is also possible for a separate spacer element 17 to be arranged between the stator mount 4 and the stator yoke 5, as shown in Figures b and d. Fig. Figure 10 shows that the cooling channel 15 can be filled with a cooling fluid, such as air or cooling oil.

[0052] It is evident from the Fig. 11-12, that at least on the contact surfaces 18 between the welding clamp 9 and the receiving groove 8 an insulation 19 is arranged. Fig. Figure 11 shows an embodiment in which the insulation 19 is connected to the welding clamp 9, while the Fig. Figure 12 shows a design in which the insulation 19 is connected to the receiving groove 8.

[0053] In the Fig. Figure 13 shows a number of further embodiment variants of the stator arrangement 1, in which the welding clamp 9 is fixed in the receiving groove 8 by means of a material bond, in particular by welding. In this case, the stator receiving 4 can have an imprint 37 which serves to dissipate welding fumes.

[0054] As from the Fig. As can be clearly seen in Figure 14, the welding clamp 9 can be fixed in the receiving groove 8 by means of two parallel, continuous welds 20 (Figure a). Alternatively, the welding clamp 9 can be fixed in the receiving groove 8 by means of two parallel, interrupted welds 20, whereby the interrupted welds 20 can also be arranged offset from each other, as shown in the Fig. the Fig. 14 can be seen. It is also possible that the welding clamp 9 is fixed in the receiving groove 8 by means of welding points 21, which is shown in the Fig. is shown.

[0055] In the Fig. Figures 15-17 show further embodiments of a stator arrangement 1, in which the welding clamp 9 projects radially from the outer surface 13 of the stator yoke 5 and has a first positive locking element 25 on its first clamp section 24 projecting from the stator yoke 5, via which the welding clamp 9 is connected to the stator receptacle 4. Similarly, the welding clamp 9 also projects radially from the inner surface 14 of the stator yoke 5 and has a second positive locking element 27 on its second clamp section 26 projecting from the stator yoke 5, via which the welding clamp 9 is connected to the stator receptacle 4. The welding clamp 9 is secured in the receptacle groove 8 by the weld seams 20.

[0056] The first positive locking element 25 and the second positive locking element 27 are designed as a circular opening 28 in the welding clamp 9.

[0057] In the Fig. Figure 16 shows an embodiment in which the stator mount 4 has an axially extending rivet 38 which passes through the opening 28 and is then formed into a rivet connection, so that the welding clamp 9 and the stator yoke 5 are fixed to the stator mount 4.

[0058] Fig. Figure 17 shows a slightly modified version of the one from the Fig. 16 known welding clamp 9, in which the positive locking means 25,27 are designed as semicircular openings 28, on each of which a bolt 39 of the stator mount 4 rests.

[0059] As shown by the Fig. As can be clearly seen in Figure 18, the welding clamp 9 can have a third positive locking element 29 formed in the area of ​​the receiving groove 8, via which the welding clamp 9 is connected to the stator mount 4. The third positive locking element 29 is formed as an opening 28 in the welding clamp 9. In the embodiments shown in Figures a and b, the third positive locking element 29 has an internal thread 30, via which the stator mount 4 is screwed to the welding clamp 9. Here, the stator yoke 5 can have a recess 40 that is aligned with the screw 31.

[0060] In the Fig. the Fig. Figure 18 shows an embodiment in which the opening 28 is penetrated by a screw 31, the thread 32 of which protrudes axially from the opening 28 in the direction of the stator mount 4 and the screw head 33 rests axially against the welding clamp 9, and wherein the stator mount 4 is secured to the screw 31 by means of a nut 34.

[0061] In the Fig. Figure 19 shows a motor vehicle 44 with an axial flux machine 2 in a drive train 43.

[0062] The invention is not limited to the embodiments illustrated in the figures. The foregoing description is therefore not to be considered limiting, but rather explanatory. The following claims are to be understood as meaning that a named feature is present in at least one embodiment of the invention. This does not preclude the presence of further features. Insofar as the claims and the foregoing description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing any hierarchy. Reference symbol list 1 Stator arrangement 2 Axial flux machine 3 Stator 4 Stator mount 5 Stator yoke 6 stator teeth Page 7 8 recordings 9 welding clamp 10 Cross-sectional contour 11 Cross-sectional contour 12 stops 13 Surface area 14 Surface area 15 cooling channels 16 plant sections 17 spacer element 18 contact surfaces 19 Insulation 20 weld seam 21 welding points 22 weld seam 23 welding points 24 bracket section 25 Form-fitting devices 26 bracket section 27 Form-fitting devices 28 Opening 29 Positive locking devices 30 internal threads 31 screw 32 threads 33 screw head 34 Mother 35 Caulking 36 sweat bumps 37. Imprint 38 rivets 39 bolts 40 recess 41 Rotor 42 Rotor shaft 43 Powertrain 44 Motor vehicle 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 non-patent literature

[0000] Journal ATZ 113th year, 05 / 2011, pages 360-365 by Erik Schneider, Frank Fickl, Bernd Cebulski and Jens Liebold entitled: Highly integrated and flexible electric drive unit for electric vehicles, which probably represents the next state of the art

[0003]

Claims

[1] Stator arrangement (1) for an 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 disc-shaped stator yoke (5) from which a plurality of stator teeth (6) extend axially, characterized by 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 by 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 by that the receiving grooves (8) are radially aligned with the stator yoke (5). [4] Stator arrangement (1) according to claim 2 or 3, characterized bythat 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 by 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 by 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 forms an axial stop (12) with a corresponding cross-sectional contour (11) of the welding clamps (9), 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 by , 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 by means of a caulking on the outer 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 by 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 by 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 by , that the stator holder (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 holder (4) is connected to the welding clamp (9) by means of a weld seam (22) which runs interruptedly along the welding clamp (9). [11] Stator arrangement (1) according to one of the preceding claims, characterized by , that the welding clamp (9) protrudes radially from the outer 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 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 the welding clamp (9) is connected to the stator receptacle (4).

Images