Electric machine, motor vehicle and method for producing a winding for an electric machine

Abstract

The invention relates to an electric machine having a winding carrier (2) provided with a plurality of slots (5, 21), the winding carrier carrying at least one winding (4), wherein the winding (4) is formed by a conductor (16), the conductor having a plurality of slot sections (8, 14, 15), the slot sections each extending in one of the slots (5, 21) of the winding carrier (2) and being electrically conductively connected via connecting sections of the conductor (16) located outside the slots (5, 21), wherein the conductor (16) has an insulating layer (17) applied to the conductor (16) at least in the slot sections (8, 14, 15), wherein the insulating layer (17) for at least two of the slot sections (8, 14, 15) has layer thicknesses (25, 26) that are different from one another.

Description

Technical Field

[0001] The invention relates to an electric machine having a winding carrier provided with a plurality of slots, the winding carrier carrying at least one winding, wherein the winding is formed by a conductor having a plurality of slot sections, the slot sections each extending in one of the slots of the winding carrier and being electrically conductively connected via connecting sections of the conductor located outside the slots, wherein the conductor has an insulating layer applied to the conductor at least in the slot sections. The invention also relates to a motor vehicle and a method for producing a winding for an electric machine. Background Art

[0002] Especially for the drive motors in motor vehicles, the so-called hairpin structure is often used. In this processing technology, a non-circular cross-section metal wire, mostly a rectangular metal wire, is first bent into a U shape, that is, bent into the shape of a hairpin or a "hairpin". Then, the legs of the hairpin are arranged in a circular shape and inserted into the slots of the stator laminated core. In the next step, the free ends of the corresponding hairpins are twisted concentrically at a specified angle relative to the stator axis. Here, all ends on the corresponding diameter, that is, at a certain position in the slot, are twisted alternately clockwise and counterclockwise. This is also called "twisting". The ends that are side by side are welded together. Depending on the winding diagram, the interconnecting bridge is installed on the winding end and welded together with the corresponding ends of the hairpin so that the hairpin is interconnected into a total winding. If necessary, the hairpin ends are then insulated and the entire stator is impregnated. This technology achieves high automation and a high copper filling factor in the stator slot, that is, a high ratio between the copper area and the slot area. Therefore, this structure is particularly suitable for electric motors in the automotive field.

[0003] When manufacturing such a stator, it may be problematic that relatively many crossovers occur between the conductor segments of different electrical phases in the winding ends. In motors with high intermediate circuit voltages, this leads to heavy loading of the electrical insulation. Therefore, it is necessary to use a relatively thick insulating layer, which, however, leads to a reduction in the copper filling factor. Alternatively or in addition, it may be attempted to further improve the high-voltage strength of the insulation by means of special insulating materials. A variety of high-voltage-resistant insulating materials are known. In this regard, purely by way of example, reference may be made to the publication DE 37 18 449 A1. Although an improvement in insulation is achieved by selecting the appropriate insulating material, the insulating layer causes a relatively high consumption of slot area. Summary of the invention

[0004] The object of the present invention is therefore to specify an electric machine which makes it possible to achieve the required insulation of the motor conductors from one another with a small consumption of slot area of ​​a winding carrier, for example a stator laminated core.

[0005] This object is achieved according to the invention by an electric machine of the type mentioned in the introduction, in which the insulation layers of at least two slot sections have layer thicknesses that differ from one another.

[0006] It is known within the scope of the invention that high voltages between the cross conductors of different phases usually occur only for relatively few turns or slot passages of the corresponding winding. In particular, in the first turns after the phase input, voltage peaks or voltage overshoots are to be expected. This effect occurs in many winding diagrams or connection diagrams for electric machines. By using different layer thicknesses for the insulation layer of different slot sections, it is possible to use particularly large layer thicknesses only in areas where particularly high voltages occur. As a result, the copper filling factor of the slot can be increased overall. In addition, it has been determined that, as will be explained in detail later, the use of different layer thicknesses for the insulation layer can be achieved with low technical effort in a winding structure in the form of a hairpin structure.

[0007] For two slot sections, the layer thicknesses of the insulating layer differ from one another by at least 5% or at least 10% or at least 50%. In particular, the layer thickness of one of the slot sections is at least 2 or 3 times the layer thickness of the other slot section. Particularly preferably, a plurality of the slot sections have a greater layer thickness of the insulating layer than the remaining slot sections.

[0008] The winding carrier can be in particular a stator body, for example a stator laminated core, and / or the winding can in particular be a stator winding. The winding carrier preferably carries a plurality of windings, wherein in particular each of the windings comprises a plurality of slot sections with insulation layers of different thicknesses.

[0009] As will be explained in detail later, the conductor is especially composed of individual conductor sections, which form a continuous conductor in the finished winding. For example, the individual conductor sections can be welded to each other or connected electrically conductively in other ways.

[0010] Preferably, the insulating layer extends on the corresponding slot section and at least on a part of the connecting section. In particular, the insulating layer extends at least into the following part of the winding head, that is, in this part, the conductors of different windings or different phases cross each other.

[0011] The sum of the cross-sectional area of ​​the conductor in the first slot segment of the slot segment and the cross-sectional area of ​​the insulating layer is equal to the sum of the cross-sectional area of ​​the conductor in the second slot segment of the slot segment and the cross-sectional area of ​​the insulating layer, in which the insulating layer has a layer thickness different from that in the first slot segment. In particular, the sum is the same for all slot segments of the winding. For the first, second slot segment and / or for all slot segments, this can be achieved in the following way, that is, the cross-sectional area of ​​the conductor is reduced in the slot segment or those slot segments in which the thicker insulating layer is used. In particular, the insulating layer can have the same outer diameter in the cross section for the first, second slot segment and / or for all slot segments. As a result, the operability of the conductor or the operability of the conductor segments connected to form the conductor can be improved when manufacturing the winding, because for such operation, only the outer dimensions of the insulated conductor and thus the outer dimensions of the insulating layer are important. For example, the conductor can be formed by a rectangular metal wire. In this case, for the first and the second slot section, in particular for all slot sections, of the winding, the width of the conductor is equal to the sum of twice the layer thickness of the insulation layer and / or the thickness of the conductor is equal to the sum of twice the layer thickness of the insulation layer.

[0012] The winding may include a plurality of interconnected conductor clamps, each of which has two slot sections and a connecting section connecting the slot sections, wherein the two slot sections of a first conductor clamp of the conductor clamps have an insulating layer with a first layer thickness, and the two slot sections of a second conductor clamp of the conductor clamps have an insulating layer with a second layer thickness different from the first layer thickness. In this case, the conductor clamps may in particular be hairpins of the plug-in coil discussed at the beginning. The conductive connection may be achieved, for example, by welding or soldering the free ends of the conductor clamps.

[0013] Preferably, each conductor clamp has an insulating layer with a substantially constant layer thickness, which extends at least over the slot section and the connection section. Preferably, the insulating layer extends over the entire length of the conductor clamp or, with the exception of the end-side contact section, over the entire length. By bending a metal wire with a constant insulation thickness into the shape of a conductor clamp, the corresponding conductor clamp can be manufactured simply. Preferably, a plurality of first conductor clamps and / or a plurality of second conductor clamps are used to form a winding.

[0014] The connecting section of the conductor clamp can form a connecting section for two slot sections on one side. The connecting section with the next or previous conductor clamp of the winding can be formed by the protruding free end of the conductor clamp, which can be twisted and welded or connected electrically conductively in other ways as explained at the beginning.

[0015] The first conductor clamp and the second conductor clamp can have the same outer dimensions. In particular, both the first conductor clamp and the second conductor clamp are bent from a corresponding insulated metal wire, wherein the insulation has the same outer dimensions. For conductor clamps whose insulation layer has a thicker layer thickness, the size of the conductor can be correspondingly reduced, and vice versa. This makes it possible to operate the first conductor clamp and the second conductor clamp together and in the same way, which is advantageous in particular when the conductor clamps are automatically introduced into the winding carrier and / or automatically connected to form a winding.

[0016] The slot sections can each have a first layer thickness or a second layer thickness. In other words, exactly two different layer thicknesses of the insulating layer can be used for all slot sections of a winding, in particular for all slot sections of all windings arranged on a winding carrier. In this case, production-related tolerances or production-related deviations of the first layer thickness and the second layer thickness can occur. For example, the actual layer thickness of the insulating layer can differ from the first layer thickness or the second layer thickness by at most 5% or at most 10% or at most 20% of the difference between the first layer thickness and the second layer thickness.

[0017] The conductor of the winding can extend from a first winding connection to a second winding connection, wherein, when the slot segments are numbered / counted along the conductor starting from the first and / or from the second winding connection, at least the insulation layer of the first slot segment and / or the second slot segment and / or the third slot segment has such an insulation layer, that is, the insulation layer has a greater layer thickness than the insulation layer of at least one slot segment farther from the first and / or second winding connection along the conductor. In particular, the layer thickness of the first slot segment and / or the second slot segment and / or the third slot segment can be greater than the layer thickness of all insulation layers of the slot segments farther from the first and second winding connections along the conductor. As already explained, particularly high voltages potentially occur between conductors of different windings or phases near the winding connection. Therefore, it is preferred to select a particularly thick insulation portion in this area. For example, when the slot segments are numbered along the conductor, at least the first three or at least the first five or at least the first seven slot segments can have a thicker insulation portion than at least a portion of the slot segments in the slot segments farther from the winding connection. For example, all slot sections adjacent to the winding connection can have a first layer thickness and slot sections further away can have a second layer thickness.

[0018] The insulating layer can be formed by a plastic sheathing of the conductor. For example, polyetheretherketone (PEEK) can be used as the material for the insulating layer. The insulation can be applied by a plastic extrusion process. Compared to the conventional insulation of the conductor by paint, the advantage achieved here is that the layer thickness of the insulating layer can be selected almost freely, while in the case of paint insulation the thickness can only be varied within a narrow range. For example, a copper conductor can be used as the conductor.

[0019] In addition to the electric machine according to the invention, the invention also relates to a motor vehicle which comprises the electric machine according to the invention.

[0020] Furthermore, the invention relates to a method for producing a winding for an electric machine, the method comprising the following steps:

[0021] - providing a winding carrier and a plurality of conductor clamps, each of which is formed by a clamp-shaped conductor segment, wherein the conductor segment has an insulation layer at least in places, wherein the insulation layers of at least two conductor clamps have different layer thicknesses from one another,

[0022] - inserting the conductor clamp axially into the winding carrier, and

[0023] - connecting the free ends of a respective group of conductor clips in order to connect the conductor sections of these conductor clips to form a conductor of a winding.

[0024] The method according to the invention thus corresponds essentially to conventional practice, for example, for producing stators in the form of a hairpin. However, in contrast to conventional practice, conductor clamps or hairpins are used which have insulating layers of different thicknesses. As explained above, the conductor clamps having insulating layers of different thicknesses have, in particular, the same outer dimensions, so that, apart from the introduction of different conductor clamps, the same production process can be used as for producing windings in conventional windings in the form of a hairpin. Thus, in particular, the same machines can be used with the same settings.

[0025] In this case, in larger series production, it is already common anyway to produce the conductor clips or hairpins on a plurality of devices operating in parallel, i.e., in particular for bending. Thus, no significant additional costs are incurred in order to equip a portion of the bending devices with otherwise insulated wires of the same size. The subsequent process steps remain unchanged. As a result, the method according to the invention can be implemented with very low technical costs.

[0026] As explained above, the connection of the conductor clamps can be achieved by twisting or twisting the free ends of the conductor clamps and subsequent connection, for example welding. After the explained steps, as explained at the beginning, interconnection bridges can be additionally attached to the resulting winding ends and connected to the ends of the conductor clamps in an electrically conductive manner, for example welded, in order to interconnect the conductor clamps to form the entire winding.

[0027] In the method according to the invention or in the motor according to the invention, it is possible that the entire conductor of the winding is formed by the conductor clamps explained above. Here, each of the conductor clamps forms two slot passages. However, in some cases it is desirable to use a single slot passage, for example to achieve contact-making on axially opposite (two) sides of the winding carrier, or to provide a winding with an odd number of slot passages. In this case, as an addition or alternative to the conductor clamps, linear clamping pins can be used, which in particular can also be pushed axially into the winding carrier and then connected to each other and / or to the conductor clamps to form the winding. It is also possible here that different linear clamping pins have insulation layers of different thicknesses. Preferably, however, the linear clamping pins are used only in the area of ​​the winding joints, whereby the linear clamping pins preferably have an insulation layer of the same thickness as the conductor clamps having a thicker insulation layer.

[0028] As an alternative or in addition to the additional use of linear clamping pins, the individual slot passages can also be realized in that after the conductor clamps have been introduced into the winding carrier and in particular after the free ends have been connected, at least one connecting section of at least one of the conductor clamps is separated to provide two winding connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Further advantages and details of the present invention can be found in the following embodiments and the accompanying drawings, in which:

[0030] Figure 1 and Figure 2 shows a sectional detail view of an embodiment of an electric machine according to the invention, the windings of which can be produced by an embodiment of the method according to the invention,

[0031] Figure 3 and Figure 4 Shown in Figure 1 and Figure 2 A detail of the conductors of the windings of the electric machine is shown in FIG.

[0032] Figure 5 shows a winding diagram of a winding for another embodiment of an electric machine according to the invention, and

[0033] Figure 6 An exemplary embodiment of a motor vehicle according to the invention is shown. DETAILED DESCRIPTION

[0034] Figure 1 A detailed view of a section of a stator 1 of an electric machine is shown. The stator 1 comprises a winding carrier 2 having teeth 3 protruding from the winding carrier and slots 5 located between the teeth. The slots 5 accommodate windings 4 of the electric machine, which are formed by corresponding conductors. Figure 1, different first slot sections 14 and second slot sections 15 of the conductor are shown. As schematically shown by the different edge thicknesses of the first slot section 14 and the second slot section 15, the insulation layer of the first slot section 14 and the second slot section 15 is as described later with reference to Figure 3 and 4 As explained in more detail below, the layers may have different layer thicknesses from one another.

[0035] As in Figure 2 As schematically shown in FIG. 1 , the winding 4 is formed by a plurality of conductor clamps 6, 7, each of which has two slot sections 8 and a connecting section 13 connecting the slot sections 8. Figure 2 In FIG. 1 , the conductor clamp 6 shown in solid lines forms the winding of the first phase, and the conductor clamp 7 shown in dotted lines forms the winding of the second phase. Figure 2 Only two phases and only one corresponding winding layer are shown in FIG. Typically, in the stator of an electric machine, windings are used for three phases, and it is also possible to provide a plurality of parallel windings for each individual phase.

[0036] When the stator 1 is manufactured, the conductor clamps 6, 7 of different phases are first arranged in a ring and then axially, i.e. in Figure 2 The free ends 9, 10 of the conductor clamps 6, 7 are initially straight, thereby enabling simple axial insertion into the winding carrier. The individual conductor clamps 6, 7 are slightly inclined relative to the radius of the winding carrier 2, so that the free end 10 of the conductor clamp 6 is located deeper in the winding plane than the free end 9, i.e., in the Figure 2 further away from the observer.

[0037] In order to connect the individual conductor clips 6, 7 to form a winding 4, the free ends 9, 10 are twisted or bent. This is also called twisting. In this case, all free ends located on a certain radius are bent in the same direction. Thus, for example, Figure 2 In the embodiment, the end 10 located in the deeper winding plane is bent to the left, and the end 9 located in the higher winding plane is bent to the right. As a result, these free ends overlap with the other free ends of the adjacent conductor clamps of the adjacent winding plane in the connection area 11 and can be connected to each other in an electrically conductive manner, especially welded.

[0038] The procedure described corresponds to the procedure known in the manufacture of stators in the form of hairpin structures. Therefore, only a very simplified example has been briefly explained above. It is important that in the construction of a stator in the form of a hairpin structure, the conductors of different windings 4 cross at a plurality of crossing points 12. At these crossing points, in particular in the area of ​​the winding joints of the individual individual windings, conductors with high voltage differences pass close to each other. Therefore, in particular in the area of ​​the winding joints, it is necessary to provide relatively thick insulation layers on the conductors. Further away from the winding joints, significantly lower voltages typically occur between the conductors of different phases that cross at the crossing points 12, so that insulation layers with thinner layer thicknesses can be used there. Therefore, in order to achieve an optimal copper filling factor, it is advantageous, as in Figure 1 As schematically shown in FIG. 1 , insulating layers with different layer thicknesses are provided for different slot sections. This is referred to below. Figure 3 and 4 Explain in more detail.

[0039] Figure 3 A detailed view of the first trough section 14 is shown, and Figure 4 A detail of the second slot section 15 is shown. The first slot section 14, the second slot section 15 are formed by applying an insulating layer 17 to the conductor 16. The insulating layer 17 can be applied in particular by a plastic extrusion process, which allows the layer thickness of the respective insulating layer 17 to be selected essentially freely.

[0040] If through Figure 3 and Figure 4 As can be easily seen from the comparison of , the first layer thickness 25 of the insulating layer 17 for the first tank section 14 is significantly smaller than the second layer thickness 26 of the insulating layer 17 for the second tank section 15. As a result, the second tank section 15 can be used in particular in areas where a high voltage difference is to be expected at the intersection with the conductors of other phases. If no high voltage difference is to be expected at the intersection 12, the first tank section 14 with the insulating layer 17 having a thinner first layer thickness 25 can be used.

[0041] Despite the different layer thicknesses of the insulating layer 17, the sum of the cross-sectional area of ​​the conductor 16 and the cross-sectional area of ​​the insulating layer 17 is identical for the first slot segment 14 and the second slot segment 15, since in both cases the conductor 16 together with the insulating layer 17 applied thereto has the same total width 18 and total height 19. Due to the identical dimensions 18, 19 of the conductor segments and thus in particular the conductor clamps 6, 7 forming the respective conductor segments, the first slot segments 14, the second slot segments 15 or the conductor clamps 6, 7 can be handled simply in the case of automated production of the stator 1, since the first slot segments 14, the second slot segments 15 or the conductor clamps 6, 7 having insulating layers 17 of different layer thicknesses can be handled in the same way using the same device.

[0042] A simple approach to achieving different layer thicknesses of the insulating layer 17 for different first slot sections 14 and second slot sections 15 is to use conductor clamps 6, 7 whose two slot sections 8 have the same layer thickness of the insulating layer 17, wherein different layer thicknesses of the insulating layer 17 can be used for different conductor clamps 6, 7. The insulating layer 17 can extend substantially over the entire length of the conductor clamps 6, 7. In the region of the connection region 11, either the insulating layer is removed during the connection, or the conductor clamps 6, 7 are provided with uninsulated ends. This makes it possible, in particular, to achieve a corresponding layer thickness of the insulating layer 17 also in the region of the intersection 12.

[0043] Next reference Figure 5 The advantages of using insulation layers with different layer thicknesses for different sections of the winding of the electric machine are explained using a specific exemplary winding diagram as an example. The winding diagram 20 shows the structure of a turn in a stator having a total of 52 slots 21. In this case, the grids 24 each mark a winding layer in a respective slot 21 for a phase. For the sake of clarity, the winding layers are shown in FIG. Figure 5 The slots and winding layers for the remaining two phases are not shown. Here, the grids marked with numbers 1 to 72 represent the individual slot sections of a winding, wherein the slot sections are numbered along the conductor. As a result, the winding is contacted at the first winding connection 27 and the second winding connection 28. The remaining empty grid 24 accommodates the second winding of the same phase (not shown for the sake of clarity). The letters A to H represent the individual winding layers of the slot 21. The arrows shown next to it indicate in which direction the free ends of the slot sections of this winding layer are bent during twisting to connect to the other free ends.

[0044] The winding shown first extends from the grid 1 (which can be arranged near the bottom of a slot, for example) as indicated by the dashed lines to the relatively far slot passage located above in the slot, i.e. the grid 23. From there, the winding is guided back to the area of ​​the slot bottom, i.e. the grid 72, as indicated by the solid lines. Here, the shape of the connecting lines 22, 23 shows how the corresponding slot sections are connected. The obliquely extending line 22 shows the connection achieved by the connecting section 13 of the corresponding conductor clamp 6, 7. The stepped line 23 shows the connection achieved by the bent ends 9, 10 of the different conductor clamps 6, 7 via the connecting area 11, for example by welding. It can be seen here that the grids 1 and 72, i.e. the slot sections providing the first winding connection 27 and the second winding connection 28, are not connected to the other slot sections via the connecting section 13. The corresponding slot sections can be introduced separately as pins. However, it is particularly advantageous to first use a common conductor clamp for the slot sections belonging to the grid 1 , 72 and to separate their connecting sections 13 after introduction into the winding carrier 2 .

[0045] As already explained above, at the intersection 12 where conductors of different phases cross, high voltages are to be expected between the crossed conductors, in particular when the intersection 12 for at least one of these conductors is located relatively close to the first winding connection 27, the second winding connection 28 along the respective conductor. Therefore, over a certain length from the first winding connection 27, the second winding connection 28, the conductor should have a stronger insulation, such as at Figure 5 5 and 66 to 72. This can be achieved simply by using conductor clamps 6, 7 with different thicknesses of insulation layers, but preferably with the same outer dimensions, as explained above. Such conductor clamps with thicker insulation layers can be used for the pairs of cells 2 and 3, 4 and 5, 70 and 71, 68 and 69, and 66 and 67. In addition, such conductor clamps can be used for the pairs of cells 1 and 72, and then the connecting sections 13 of these conductor clamps 6, 7 can be separated, as already explained above. On the other hand, for the remaining slot sections, more precisely the cells 6 to 65, conductor clamps 6, 7 with thinner insulation layers 17 can be used to achieve a high copper filling factor of the slot 5 as a whole.

[0046] The described approach is important, in particular, when the electric machine 30 is used in a motor vehicle 31, as in Figure 6 Here, the electric machine 30 has a rotor 32 and the stator 1 already discussed above. The electric machine 30 can be used, for example, to drive a motor vehicle 31. The described approach achieves a high power density with a compact design of the electric machine.

Claims

1. An electric machine having a winding carrier (2) provided with a plurality of slots (5, 21), the winding carrier carrying at least one winding (4), wherein: The winding (4) is formed by a conductor (16), which has a plurality of slot sections, each of which extends in one of the slots (5, 21) of the winding carrier (2) and is electrically conductively connected via a connecting section of the conductor (16) located outside the slot (5, 21), wherein the winding (4) comprises a plurality of conductor clamps (6, 7) which are electrically conductively connected to each other, each of which forms two slot sections and a connecting section (13) connecting the slot sections, wherein the individual conductor clamps (6, 7) are inclined relative to a radius of the winding carrier (2) such that a first free end (10) of the respective conductor clamp (6) is located deeper in the winding plane than a second free end (9) of the conductor clamp (6), characterized in that the conductor (16) has an insulating layer (17) applied to the conductor (16) at least in the slot sections, wherein the insulating layer (17) for at least two of the slot sections has The invention relates to a winding (4) having two slot sections with different layer thicknesses, wherein the two slot sections of a first conductor clamp of the conductor clamp (6, 7) have an insulation layer (17) with a first layer thickness (25), and the two slot sections of a second conductor clamp of the conductor clamp (6, 7) have an insulation layer (17) with a second layer thickness (26) different from the first layer thickness (25), and the conductor (16) of the winding (4) extends from a first winding connection (27) to a second winding connection (28), wherein when the slot sections are numbered along the conductor (16) starting from the first winding connection (27) and / or from the second winding connection (28), at least the insulation layer (17) of the first slot section and / or the second slot section and / or the third slot section has such an insulation layer (17) that it has a greater layer thickness than the insulation layer (17) of at least one slot section which is farther away from the first winding connection (27) and / or the second winding connection (28) along the conductor.

2. The motor according to claim 1, characterized in that The sum of the cross-sectional area of ​​the conductor (16) and the cross-sectional area of ​​the insulating layer (17) in a first of the slot sections is equal to the sum of the cross-sectional area of ​​the conductor (16) and the cross-sectional area of ​​the insulating layer (17) in a second of the slot sections, the insulating layer (17) having a different layer thickness in the second slot section than in the first slot section.

3. The motor according to claim 1, characterized in that The first conductor clamp and the second conductor clamp (6, 7) have the same outer dimensions (18, 19).

4. The motor according to any one of claims 1 to 3, characterized in that: The groove sections each have a first layer thickness (25) or a second layer thickness (26).

5. The motor according to any one of claims 1 to 3, characterized in that: The insulating layer (17) is formed by the plastic sheathing of the conductor (16).

6. A motor vehicle, characterized in that: The motor vehicle comprises an electric machine (30) according to any one of the preceding claims 1 to 5.

7. A method for manufacturing a winding (4) for an electric machine (30), the method comprising the following steps: - providing a winding carrier (2) and a plurality of conductor clamps (6, 7), each of which is formed by a clamp-shaped conductor segment, wherein the conductor segment at least partially has an insulation layer (17), wherein the insulation layers (17) of at least two conductor clamps (6, 7) have layer thicknesses different from one another, wherein two slot sections of a first conductor clamp of the conductor clamps (6, 7) have an insulation layer (17) with a first layer thickness (25), and two slot sections of a second conductor clamp of the conductor clamps (6, 7) have an insulation layer (17) with a second layer thickness (26) different from the first layer thickness (25). ), a conductor (16) of the winding (4) extending from a first winding connection (27) to a second winding connection (28), wherein, when the slot sections are numbered along the conductor (16) starting from the first winding connection (27) and / or from the second winding connection (28), at least the insulation layer (17) of the first slot section and / or the second slot section and / or the third slot section has such an insulation layer (17) that the insulation layer has a greater layer thickness than the insulation layer (17) of at least one slot section which is further away from the first winding connection (27) and / or the second winding connection (28) along the conductor, - inserting the conductor clips (6, 7) axially into the winding carrier (2) such that the individual conductor clips (6, 7) are inclined relative to the radius of the winding carrier (2) such that the first free end (10) of the respective conductor clip (6) is located deeper in the winding plane than the second free end (9) of the conductor clip (6), and - connecting the free ends (9, 10) of a corresponding set of conductor clamps (6, 7) to connect the conductor sections of these conductor clamps (6, 7) to form a conductor (16) of a winding (4).

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