Method for manufacturing a stator winding and electric machine

Abstract

The invention relates to a method for manufacturing a stator winding (1) for a stator (2) of an electrical machine (3), having the following steps: - providing stator wires (4), - winding the stator wires (4) around winding tools (5) in order to produce a wave-shaped winding having a plurality of winding waves (6), - holding the stator wires (4) on a first winding device (5a) and a second winding device (5b) by means of holding devices (7), - relatively moving the second winding device (5b) relative to the first winding device (5a) in the direction of the course of a first winding longitudinal axis (W1), and - relatively folding the first winding device (5a) relative to the second winding device (5b) about the first winding longitudinal axis (W1) by a folding angle. Furthermore, the invention also relates to an electrical machine (3) having a rotor (8) and a stator (2), wherein the stator (2) has a stator winding (1) made of electrically insulated stator wires (4).

Description

TECHNICAL FIELD

[0001] The present application relates to a method for manufacturing a stator winding for a stator of an electrical machine. Furthermore, the present application also relates to an electrical machine having a stator with such a stator winding. BACKGROUND

[0002] There are a number of different embodiments of electrical machines. A common type of electrical machine has a stator which is arranged coaxially with a rotor which is rotatably supported relative to the stator. In a particularly widespread embodiment, the stator surrounds the rotor or at least one active region of the rotor over the entire circumference or over a partial circumference as a segmented stator. In order to provide a magnetic field, permanent magnets or magnetic coils or rotor windings are usually arranged on the rotor. The stator has a stator winding in order to generate an alternating magnetic field which interacts with the magnetic field of the rotor in order to drive the rotor.

[0003] The stator winding has one or more stator wires which are arranged next to one another, are wound around the stator and are arranged in stator slots of the stator. According to known methods, the stator winding is first manufactured on a winding device and is then arranged on the stator. In some winding methods, such as needle winding, fly winding and linear winding techniques, the stator winding is directly manufactured on the stator, on a single tooth or on a tooth group. In order to avoid current flow between adjacent stator wire sections, in particular in the stator slots, the stator wires are completely insulated, in particular provided with an insulating lacquer layer.

[0004] Furthermore, there are different winding types for stator windings, such as lap windings and wave windings. In operation, adjacent winding waves of a wave winding have a voltage difference from one another. The greater the voltage difference, the greater the likelihood of partial discharges, electrical ageing and thus of electrical machine failure.

[0005] In order to avoid partial discharges, it is known to increase the layer thickness of the insulating layer surrounding the stator wire or to introduce additional insulating material into the stator slots or the winding head. Both of these solutions have the disadvantage of reducing the efficiency of the electrical machine. Wave windings are known, for example, from DE 10 2016 222 818 A1.

[0006] A stator winding configured as a wave winding is known from DE 10 2015 222 367 A1, which has at least two parallel-connected winding phases, wherein the winding phases are each configured as a series connection of at least two winding sections. The winding sections can be, for example, welded to one another. US 2016 / 0268860 A1 and US 2018 / 0278111 A1 each show a wave winding for a stator of an electrical machine, wherein the stator wire is composed of a plurality of stator wire sections which are welded together in a row. Such a stator winding can only be manufactured very expensively, and furthermore, large voltage differences can still occur between adjacent stator wire sections. SUMMARY

[0007] The technical problem to be solved by the present application is therefore to eliminate or at least partially eliminate the above-mentioned disadvantages in the stator winding, in particular in a wave winding. In particular, the technical problem to be solved by the present application is to provide a method for manufacturing a stator winding for a stator of an electrical machine, which ensures the manufacture of a stator winding in a simple and inexpensive manner and method, which in particular has a small voltage difference between adjacent stator shaft segments. Furthermore, the technical problem to be solved by the present application is to provide an electrical machine, which can be manufactured in a simple and inexpensive manner and which in particular has a small voltage difference between adjacent stator shaft segments.

[0008] Here, the features and details described in connection with the method according to the present application are naturally also applicable in connection with the electrical machine according to the present application and vice versa, so that with regard to the disclosure of the individual aspects of the present application, constant or mutual reference is always made or can be made.

[0009] According to a first aspect of the present application, the technical problem is solved by a method for manufacturing a stator winding for a stator of an electrical machine. The method has the following steps:

[0010] - providing a stator wire,

[0011] - winding the stator wire around a winding tool in order to produce a wave winding having a plurality of winding waves, wherein the winding tool has a first winding device (or winding device) and a second winding device arranged spaced apart from the first winding device, wherein the first winding device and the second winding device jointly extend at least in one region along a first winding longitudinal axis extending centrally between the first winding device and the second winding device, wherein the respective winding wave is produced by winding the stator wire around the first winding tool (or first winding device) and the second winding tool (or second winding device), respectively,

[0012] - holding the stator wire on the first winding device and the second winding device in order to prevent lateral slipping of the stator wire in the direction of the course of the first winding longitudinal axis,

[0013] - relatively moving the second winding device relative to the first winding device in the direction of the course of the first winding longitudinal axis, wherein the respective winding wave is thereby respectively bent along the first winding longitudinal axis, and

[0014] - relatively folding (or flipping) the first winding device relative to the second winding device about the first winding longitudinal axis by a folding angle, so that a stator wire segment arranged on the first winding device is arranged adjacent to a stator wire segment arranged on the second winding device.

[0015] In the sense of the present application, "adjacently arranged" stator wire sections are to be understood in particular as meaning that the stator wire sections occupy the same position at least partially along the winding longitudinal axis, i.e. they lie next to one another at least partially transversely to the winding longitudinal axis, so that, after the wave winding has been installed, the stator wire sections are preferably arranged in a common stator slot.

[0016] The stator wire is provided, for example, in the manner of a roll on a winding drum. According to the application, it is preferable to provide straightened stator wire. A plurality of stator wires is preferably provided, so that a stator winding having a plurality of different phases, in particular three phases, can be produced. According to the application, a plurality of stator wires, for example two, three or more, can also be provided for each phase. Subsequently, for better understanding, the method is described only for one stator wire, wherein the description can also be transferred to a plurality of stator wires.

[0017] The stator wire for the winding drum is preferably unreeled, straightened and fed to the winding tool by means of a wire nozzle. The wire nozzle is preferably configured for feeding a plurality of stator wires to the winding tool at the same time, so that the individual phases can be wound simultaneously.

[0018] The stator wire is wound around the winding tool. Here, a stator winding configured as a wave winding is produced, which has a plurality of winding waves. The winding tool has a first winding device and a second winding device spaced apart from the first winding device. Each winding wave is produced in such a way that the stator wire is wound from the first winding device to the second winding device and further to the first winding device. The winding angle of the stator wire on the first winding device and the second winding device is preferably less than 200°, and more preferably approximately 180°, respectively. The first winding device and the second winding device are thus jointly spanned by the stator wire with a single winding wave.

[0019] The stator wire is held on the first winding device and the second winding device by means of holding devices. The holding devices are configured in such a way that a lateral slipping of the stator wire parallel to the winding longitudinal axis is prevented or at least made more difficult. The stator wire is preferably held in such a way that a relative movement of the stator wire transversely, in particular perpendicularly, to the winding longitudinal axis is possible. The holding devices are preferably arranged on the first winding device, and the holding devices are preferably arranged on the second winding device. The holding devices are preferably configured to be rigid. According to the application, it can be provided that the holding devices are configured in one piece with the first winding device, and the holding devices are configured in one piece with the second winding device. According to the application, the holding devices may, for example, have a clamping device for clamping the stator wire.

[0020] When the first winding device is moved relative to the second winding device in a particular direction, the stator wire is entrained by the respective winding device, so that the wave winding produced thereby is correspondingly bent or deflected Here, for example, the first winding device can be held positionally fixed, and the second winding device can be moved along a predetermined direction, in particular in an arcuate shape, along the winding longitudinal axis by a predetermined distance. Alternatively, the first winding device and the second winding device can also be moved along the winding longitudinal axis in opposite directions, in particular in an arcuate shape. A simultaneous, joint movement of the first winding device and the second winding device along an arbitrary common movement path can optionally be implemented. The result of the method step is a wave-shaped winding, wherein the upper half-wave is arranged offset with respect to the lower half-wave along the winding longitudinal axis. The relative movement is preferably carried out such that adjacent stator line sections in the completed stator winding have a voltage difference of at most 50% of the maximum possible potential difference of the stator winding.

[0021] Finally, the first winding device and the second winding device are pivoted relative to one another about the winding longitudinal axis. Here, for example, the first winding device can be held positionally fixed, and the second winding device can be pivoted about the winding longitudinal axis. Alternatively, the first winding device and the second winding device can also be pivoted relative to one another about the winding longitudinal axis. A simultaneous, joint movement of the first winding device and the second winding device along an arbitrary common movement path can optionally be implemented. The result of the method step is a wave-shaped winding, wherein the upper half-wave is arranged on the same side of the winding longitudinal axis as the preceding lower half-wave.

[0022] The method for manufacturing a stator winding of a stator for an electrical machine according to the application has the advantage compared to conventional methods that the stator winding can be manufactured with simple means and in an inexpensive manner and method, wherein adjacent stator line sections have a particularly small voltage difference. Furthermore, it is not necessary to laboriously solder the stator line sections. By means of the method according to the application, a stator winding can be particularly advantageously manufactured, for example, wherein four stator lines or four stator lines in a plurality of groups, for example 8, 12 stator lines, etc., are arranged in one stator slot.

[0023] According to a preferred refinement of the application, it can be provided in the method that stator lines having a rectangular line cross section are provided. It is preferred here that the line cross section has a line width and a line height which are configured to be of different dimensions. A stator line of this type has the advantage that the degree to which the stator slots are filled with stator lines is improved, since, after the stator winding has been manufactured, smaller gaps are configured between adjacent stator lines.

[0024] It is preferred according to the application that stator lines are provided, which have a line height of at most 3 mm and a line width of at most 5 mm. The line height is particularly preferably between 1 mm and 2.5 mm, in particular 2 mm, and the line width is between 2 mm and 4.5 mm, in particular 3 mm. A stator line of this type is particularly suitable for manufacturing a stator winding and can be deformed easily with common manufacturing means.

[0025] More preferably, a first wickel sword serves as the first winding device and / or a second wickel sword serves as the second winding device. According to the application, a wickel sword is understood to be a device which extends along a winding longitudinal axis, which has two parallel or at least substantially parallel sides. Preferably, the wickel sword has a winding side and a free side opposite the winding side. The winding side is configured for providing a counter bearing for the stator wire during winding, wherein the free side of the wickel sword faces another wickel sword. The winding side and the free side are preferably curved or rounded in order to improve the bending of the stator wire around the wickel sword and to avoid wire damage. The holding device is preferably arranged on the sides of the wickel sword. The advantage of such a winding device is that the winding of the stator wire and the relative movement of the winding devices can be carried out particularly advantageously.

[0026] In a particularly preferred design, the first winding device is moved relative to the second winding device along the first winding longitudinal axis by a distance of between 5 / 12 and 7 / 12 of the winding wavelength of the winding wave. In a preferred two-layer winding, the relative movement is 1 / 2 of the winding wavelength. This has the advantage that a particularly uniformly configured stator winding is produced in a simple device and in an inexpensive manner and method.

[0027] Preferably, the stator wire is held at the front side and at the rear side of the first winding device and / or at the front side and at the rear side of the second winding device at respectively different heights by means of the holding device. Thus, the stator wire is held, for example, at the rear side of the first winding device at a different height than at the front side of the first winding device. In this connection, height is understood to be the distance from the first winding longitudinal axis. This has the effect that, during the relative movement, the stator wire is bent or folded at different heights and thus configured with different angles. This is advantageous in the case of a relative fold, since, during the fold, the outer wire sections pass through a greater distance than the inner wire sections and this difference can be compensated by different angles in a simple device and in an inexpensive manner and method.

[0028] According to a preferred embodiment of the application, on the winding device, a wave-shaped winding having a plurality of winding waves is generated from the stator wires, such that the stator wires are wound around the first winding device, the second winding device and the third winding device, wherein the second winding device is arranged between the first winding device and the third winding device, wherein the first winding device, the second winding device and the third winding device jointly extend at least in one region along a first winding longitudinal axis, wherein the second winding device is moved relatively to the first winding device and to the third winding device in the direction of the course of the first winding longitudinal axis, and wherein the third winding device is folded relatively to the second winding device about a second winding longitudinal axis extending centrally between the second winding device and the third winding device by a folding angle, such that the stator wire sections arranged on the third winding device are arranged adjacent to the stator wire sections arranged on the second winding device. In the case of the relative movement, it is preferred that the relative position of the first winding device to the third winding device remains constant. Thus, for example, only the second winding device is moved along the first winding longitudinal axis. The second winding longitudinal axis is arranged between the second winding device and the third winding device and preferably extends parallel to the first winding longitudinal axis. In this way, for example, the stator winding can be manufactured in a simple device and in an inexpensive manner and method, which has six stator wires or six groups of stator wires, for example 12, 18 stator wires, etc. in each stator slot.

[0029] According to the application, the method can also be carried out with further winding devices, which can be arranged and used similarly to the other winding devices. It is therefore preferred that the winding devices are alternately assigned to the first group and the second group, wherein the relative movement takes place as a relative movement of the two groups to each other. Preferably, the winding devices of one group have a constant relative position to each other when the relative movement takes place. The folding takes place about a winding longitudinal axis, which is arranged centrally between the two winding devices, respectively, and preferably extends parallel to each other. This has the advantage that the number of stator wires per stator slot can be increased with a simple device and in an inexpensive manner and method.

[0030] It is particularly preferred that the folding takes place with a folding angle of between 175° and 185°, in particular with a folding angle of 180°. In this folding angle, the upper half wave is arranged on the same side of the winding longitudinal axis as the previous lower half wave and is arranged directly adjacent to each other. Thus, a particularly advantageous space utilization can be achieved by the stator winding with a simple device and in an inexpensive manner and method.

[0031] It is preferred that holding devices for holding the stator wires are arranged on the first and second winding devices. It can be provided here that at least one holding device is configured in one piece with the winding device. For example, holding devices configured as stop bodies, for example walls, grooves, etc., are used. The stop surface of the holding device preferably has an angle of 90° or less with the base body of the respective winding device. The advantage of the acute angle is that the stator wires can thereby be prevented from unintentionally sliding laterally out of the holding device and thus out of the winding device. This has the advantage that the space requirement for implementing the method according to the application is reduced. The angle is preferably greater than 60° in order to improve the separation of the stator winding from the winding device. Holding devices arranged on the winding devices have the particular advantage that the joint movement of the winding device and the holding device is improved in a simple manner and at low cost.

[0032] According to a second aspect of the application, the technical problem is solved by an electric machine having a rotor and a stator. The stator has a stator winding made of electrically insulated stator wires. According to the application, the stator winding is manufactured according to the method according to the application.

[0033] All advantages that have been described for the method for manufacturing a stator winding for a stator of an electric machine according to the first aspect of the application arise in the described electric machine. BRIEF DESCRIPTION OF DRAWINGS

[0034] The method for manufacturing a stator winding for a stator of an electric machine according to the application and the electric machine according to the application are explained in detail below with reference to the drawings. The following is shown schematically:

[0035] Figure 1 A first method part of a preferred first embodiment of the method according to the application is shown in a side view,

[0036] Figure 2 A second method part of a preferred first embodiment of the method according to the application is shown in a side view,

[0037] Figure 3 A third method part of a preferred first embodiment of the method according to the application is shown in a side view, Figure 2

[0038] Figure 4 A stator winding according to a preferred first embodiment of the method according to the application is shown in a perspective view,

[0039] Figure 5 A stator winding manufactured by means of a preferred first embodiment of the method according to the application is shown in a perspective view,

[0040] Figure 6 ​A distribution of stator wires on the stator slots of a stator winding manufactured according to the preferred first embodiment of the method according to the application is shown in a side view,

[0041] Figure 7 A first method portion of the preferred second embodiment of the method according to the application is shown in a side view,

[0042] Figure 8 A second method portion of the preferred second embodiment of the method according to the application is shown in a side view,

[0043] Figure 9 A stator winding according to the preferred second embodiment of the method according to the application is shown in a side view,

[0044] Figure 10 A distribution of stator wires on the stator slots of a stator winding manufactured according to the preferred second embodiment of the method according to the application is shown in a side view, and

[0045] Figure 11 A preferred first embodiment of the electric machine according to the application is shown in a side view. DETAILED DESCRIPTION

[0046] Elements having the same function and mode of action are each provided with the same reference signs in the attached Figures 1 to 11 drawings.

[0047] Figure 1 A first method portion of the preferred first embodiment of the method according to the application is shown schematically in a side view. First, a winding tool 5 having a first winding device 5a and a second winding device 5b is provided, the first winding device and the second winding device each being configured as a winding sheet and extending parallel to one another. The first winding device 5a and the second winding device 5b each have a front side V and a non-visible rear side R. The stator wires 4 are wound around the winding tool 5 by means of wire nozzles 9. A plurality of winding waves 6 having a winding wave length L is produced here. Each winding wave 6 extends around the first winding device 5a and the second winding device 5b, respectively. In this embodiment, only two stator wires 4 are shown for the sake of clarity.

[0048] Figure 2 A second method portion of the preferred first embodiment of the method according to the application is shown schematically in a side view. In this second method portion, the second winding device 5b is moved relative to the first winding device 5a along a first winding longitudinal axis Wl. Here, the stator wires 4 are pressed against holding devices 7 arranged on the front side V and the rear side R of the first winding device 5a and the second winding device 5b, thereby folding the stator wires 4. As can be seen from the figure, the holding devices 7 are arranged in a staggered manner on the front side V and the rear side R of the first winding device 5a and the second winding device 5b. In this embodiment, only two stator wires 4 are shown for the sake of clarity. Figure 2As can be seen, compared with the holding device 7 on the rear R of the first winding device 5a, the distance between the holding device 7 on the front V of the first winding device 5a and the first winding longitudinal axis W1 is smaller.

[0049] Figure 3 A stereoscopic diagram schematically shows the source from Figure 2 The stator wires 4 are wound and folded. The winding wave 6 extends along the first winding longitudinal axis W1, wherein the stator wire segment below the stator wire 4 is offset along the winding longitudinal axis W1 relative to the stator wire segment above the stator wire 4.

[0050] Figure 4 The stator winding 1 of the third method portion according to a preferred first embodiment of the method according to the invention is schematically shown in a side view. The stator wire section previously below the stator wire 4 is folded onto the stator wire section above the stator wire 4, thereby producing a stator winding 1 with winding waves 6, which has an approximately honeycomb structure.

[0051] Figure 5 A perspective view schematically illustrates a stator winding 1 manufactured by a preferred first embodiment of the method according to the invention. The stator winding 1 has a plurality of winding waves 6. In this view, a plurality of stator wires 4 are processed into the stator winding 1 by the method according to the invention. The winding waves 6 have the same distance from each adjacent winding wave 6.

[0052] Figure 6 The distribution of stator wires 4 in the stator slots of the stator winding 1 manufactured according to a preferred first embodiment of the method according to the invention is schematically shown in a side view. From this view, it can be seen that the stator wires 4 are first arranged in the first layer or the lowest layer of the first stator slot 10a. Then, the stator wires 4 extend to the second layer of the second stator slot 10b. Then, the stator wires 4 extend to the third layer of the first stator slot 10a, and finally, the stator wires 4 extend to the fourth or the highest layer of the second stator slot 10b. Then, the same pattern begins again in the first layer or the lowest layer of the third stator slot 10c. The other stator wires 4 of the stator winding 1 extend in a similar manner. Therefore, the layer order of the stator wires 4 in the four wire layers of each stator slot is preferably the first layer, the second layer, the third layer, the fourth layer, and then starting again from the beginning.

[0053] Figure 7A first method portion of a preferred second embodiment of the method according to the invention is schematically shown in a side view. First, a winding tool 5 is provided, having a first winding device 5a, a second winding device 5b, and a third winding device 5c, which are each configured as a winding sheet and extend parallel to each other. The first winding device 5a, the second winding device 5b, and the third winding device 5c each have a front side V and an invisible rear side R. Stator wires 4 are wound around the winding tool 5 through wire nozzles 9. This generates a plurality of winding waves 6 having winding wavelengths L. Each winding wave 6 extends around the first winding device 5a, the second winding device 5b, and the third winding device 5c, respectively. In this embodiment, only two stator wires 4 are shown for clarity.

[0054] Figure 8 A side view schematically illustrates a second method portion of a preferred second embodiment of the method according to the invention. In this second method portion, the second winding device 5b moves relative to the first winding device 5a and relative to the third winding device 5c along the first winding longitudinal axis W1. Here, the stator wire 4 is pressed against the holding devices 7 arranged on the front V and rear R sides of the first winding device 5a, the second winding device 5b, and the third winding device 5c, thereby folding the stator wire 4. (As shown from...) Figure 8 As can be seen, compared to the holding device 7 on the rear R of the first winding device 5a, the distance between the holding device 7 on the front V of the first winding device 5a and the first winding longitudinal axis W1 is smaller. Similarly, compared to the holding device 7 on the rear R of the third winding device 5a, the distance between the holding device 7 on the front V of the third winding device 5c and the second winding longitudinal axis W2 is smaller.

[0055] Figure 9 The stator winding 1 of the third method portion according to a preferred second embodiment of the method according to the invention is schematically shown in a side view. The stator wire segments previously below and above the stator wire 4 are folded onto the stator wire segments in the middle of the stator wire 4, thereby producing a stator winding 1 with winding waves 6, which has an approximately honeycomb structure.

[0056] Figure 10The distribution of stator wires in the stator slots of a stator winding 1 manufactured according to a preferred second embodiment of the method according to the invention is schematically shown in a side view. From this view, it can be seen that the stator wires 4 are first arranged in the first layer or the lowest layer of the first stator slot 10a. Then, the stator wires 4 extend to the second layer of the second stator slot 10b. Then, the stator wires 4 extend to the third layer of the first stator slot 10a. Then, the stator wires 4 extend to the sixth layer or the highest layer of the second stator slot 10b. Then, the stator wires 4 extend to the fifth layer of the third stator slot 10c, and finally to the fourth layer of the second stator slot 10b. Then, the same pattern begins again in the first layer or the lowest layer of the third stator slot 10c. The other stator wires 4 of the stator winding 1 extend in a similar manner. Therefore, the layer order of the stator wires 4 in the six wire layers of each stator slot is preferably the first layer, second layer, third layer, sixth layer, fifth layer, fourth layer, and then starting again from the beginning. The preferred layer order of stator lines 4 in the eight layers of each stator slot is layer 1, layer 2, layer 3, layer 6, layer 7, layer 8, layer 5, layer 4, and then starting from the beginning again. The preferred layer order of stator lines 4 in the ten layers of each stator slot is layer 1, layer 2, layer 3, layer 6, layer 7, layer 10, layer 9, layer 8, layer 5, layer 4, and then starting from the beginning again. This can be similarly continued for any number of layers.

[0057] Figure 11 A preferred embodiment of the motor 3 according to the invention is schematically shown in a side view. The motor 3 has a stator 2 with a stator winding 1 according to the invention. Furthermore, the motor 3 has a rotor 8, which is rotatably supported relative to the stator 2 by rolling bearings 11. Permanent magnets 12 are arranged on the rotor 8 facing the stator 2.

[0058] List of reference numerals

[0059] 1 stator winding

[0060] 2 stators

[0061] 3 motors

[0062] 4 stator lines

[0063] 5. Winding tool

[0064] 5a First winding device

[0065] 5b Second winding device

[0066] 5c Third Winding Device

[0067] 6-winding wave

[0068] 7. Holding device

[0069] 8 rotors

[0070] 9-line nozzle

[0071] 10a first stator slot

[0072] 10b Second Stator Slot

[0073] 10c third stator slot

[0074] 11 Rolling Bearings

[0075] 12 permanent magnets

[0076] L winding wavelength

[0077] R rear side

[0078] V front side

[0079] W1 First winding longitudinal axis

[0080] W2 Second Winding Vertical Axis

Claims

1. A method for manufacturing a stator winding (1) of a stator (2) for an electrical machine (3), the method having the following steps: - providing a stator wire (4), - first winding the stator wire (4) around the winding tool (5) by means of the wire nozzle (9) to produce a wave-shaped winding having a plurality of winding waves (6) having a winding wave length (L), wherein the winding tool (5) has a first winding device (5a) and a second winding device (5b) arranged spaced apart from the first winding device (5a), wherein the first winding device (5a) and the second winding device (5b) jointly extend at least in one region along a first winding longitudinal axis (W1) extending centrally between the first winding device (5a) and the second winding device (5b), wherein a plurality of winding waves (6) is generated by winding the stator wire (4) around the first winding device and the second winding device, respectively, - holding the wave-shaped winding with the plurality of winding waves (6) on the first winding device (5a) and the second winding device (5b) by means of a holding device (7) in order to prevent a lateral slipping of the wave-shaped winding with the plurality of winding waves (6) in the direction of the course of the first winding longitudinal axis (W1), - relatively moving the second winding device (5b) with respect to the first winding device (5a) in the direction of the course of the first winding longitudinal axis (W1), wherein the plurality of winding waves (6) of the wave-shaped winding is thereby respectively bent along the first winding longitudinal axis (W1), and - relatively folding the first winding device (5a) with respect to the second winding device (5b) around the first winding longitudinal axis (W1) by a folding angle, such that stator wire sections arranged on the first winding device (5a) are arranged adjacent to stator wire sections arranged on the second winding device (5b).

2. The method of claim 1, wherein, A stator wire (4) having a rectangular wire cross-section is provided.

3. The method of claim 2, wherein, A stator wire (4) is provided, which has a wire height of at most 3 mm and which has a wire width of at most 5 mm.

4. The method of claim 1, wherein, A first winding sheet serves as the first winding device (5a) and / or a second winding sheet serves as the second winding device (5b).

5. The method of claim 1, wherein, The first winding device (5a) is relatively moved with respect to the second winding device (5b) along the first winding longitudinal axis (W1) by a distance between 5 / 12 and 7 / 12 of a winding wave length (L) of the winding waves (6).

6. The method of claim 1, wherein, The stator wire (4) is held by the holding device (7) at the front side (V) and the rear side (R) of the first winding device (5a) and / or at the front side (V) and the rear side (R) of the second winding device (5b) at different heights, respectively.

7. The method of claim 1, wherein, On the winding tool (5), a wave-shaped winding with a plurality of winding waves (6) is generated from the stator wire (4) such that the stator wire (4) is wound around a first winding device (5a), a second winding device (5b) and a third winding device (5c), wherein the second winding device (5b) is arranged between the first winding device (5a) and the third winding device (5c), wherein the first winding device (5a), the second winding device (5b) and the third winding device (5c) jointly extend at least in one region along the first winding longitudinal axis (W1), wherein the second winding device (5b) is moved relatively to the first winding device (5a) and to the third winding device (5c) in the direction of the course of the first winding longitudinal axis and wherein the third winding device (5c) is folded relatively to the second winding device (5b) about the second winding longitudinal axis (W2) extending centrally between the second winding device (5b) and the third winding device (5c) by a folding angle such that stator wire sections arranged on the third winding device (5c) are arranged adjacent to stator wire sections arranged on the second winding device (5b).

8. The method of claim 1, wherein, The folding is carried out with a folding angle between 175° and 185°.

9. The method of claim 8, wherein, The folding is carried out with a folding angle of 180°.

10. The method of claim 1, wherein, A holding device (7) for holding the stator wire (4) is arranged between the first winding device (5a) and the second winding device (5b).

11. An electric machine (3) having a rotor (8) and a stator (2), wherein The stator (2) has a stator winding (1) made of electrically insulated stator wire (4), characterized in that the stator winding (1) is manufactured according to the method according to any one of the preceding claims 1 to 10.

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