Coil former for a stator pole of an electric machine

Abstract

A winding unit (1) for an electric machine comprises a winding body (2) which has a winding region with a cross-section of polygonal shape, for example tetragonal shape, having a plurality of sides (4, 5, 6, 7) and having a plurality of rounded corner regions (R1, R2, R3, R4). The first side (4) and the third side (6) have a greater first edge length (L) than the second side (5) and the fourth side (7), which each have a second edge length (K). A winding conductor is wound onto the winding body (2) in the winding direction (W) along said sides (4, 5, 6, 7). Therefore, the first rounded corner region (R1), which is adjoined by the first side (4) in the winding direction (W), has a larger radius of curvature than the second rounded corner region (R2) between the first side (4) and the second side (5). As a result, the winding conductor bulges less on the longer sides (4, 6) and forms a smaller cavity.

Description

[0001] P231135 DE

[0002] - 1 -

[0003] Description

[0004] Title of the invention

[0005] Winding unit for electric machine

[0006] field of technology

[0007] The present invention relates to a winding unit for an electric machine and in particular to a non-circular winding unit for an electric machine.

[0008] State of the art

[0009] Electric machines are used to convert electrical energy into mechanical energy or vice versa. An electric machine designed as a drive machine for a motor vehicle is particularly suitable for use within the powertrain of a hybrid or fully electric vehicle.

[0010] Electrical machines consist of a stator and a rotor that moves relative to the stator. Relative movement between the stator and the rotor is caused by an electrical or magnetic excitation, which is generated by magnets or appropriately designed coils made from a winding conductor. Depending on the design, so-called distributed or concentrated windings can be used. For this purpose, a winding conductor is wound around stator or rotor teeth or pluggable winding bodies according to specifications using a winding method, such as a linear winding method, a flyer winding method, a needle winding method, or a pole chain winding method. If the winding conductor is wound onto a winding body or directly onto a tooth, it is called a concentrated winding, a tooth coil, or a pad winding. For the sake of simplicity, a P231135 DE

[0011] - 2 - such a winding body as well as a tooth of a stator or rotor is referred to as a winding body.

[0012] Fig. 9 shows a schematic view of a cross-section of a winding unit in the prior art.

[0013] In Fig. 9, reference numeral 1 denotes a winding unit, reference numeral 2 denotes a winding body, reference numeral 3 denotes a tooth, reference numeral 4 denotes a first side of the winding body, reference numeral 5 denotes a second side of the winding body, reference numeral 6 denotes a third side of the winding body, reference numeral 7 denotes a fourth side of the winding body, reference numeral L denotes a first edge length of the winding body, reference numeral K denotes a second edge length of the winding body, reference numeral r denotes a corner region of the tooth, reference numeral R denotes a rounded corner region of the winding body, and reference numeral W denotes a winding direction.

[0014] As shown in Fig. 9, the winding unit 1 includes the winding body 2, which is mounted on the tooth 3. The winding body 2 can, for example, be made of an electrically insulating material to contribute to the electrical insulation of a winding (not shown) mounted on it from the tooth 3. The tooth 3 can be a tooth of a stator or rotor of an electrical machine.

[0015] The winding body 2 has a winding area with a cross-section in the form of a rectangle with four sides, i.e., the first to fourth sides 4, 5, 6, 7, and four rounded corner regions R. The tooth also has a rectangular cross-section with four corner regions r, which may optionally be rounded.

[0016] The rounded corner areas R of the winding body 2 each have the same radius of curvature relative to each other. The possibly rounded corner areas of the tooth 3 also each have the same radius of curvature relative to each other. P231135 DE

[0017] - 3 -

[0018] The first side 4 and the third side 6 of the winding body 2 have the first edge length L, and the second side 5 and the fourth side 7 of the winding body 2 have the second edge length K. The first edge length L is longer than the second edge length K. A winding conductor, not shown in Fig. 9 for clarity, is wound around the winding body 2 in the winding direction W along the first to fourth sides 4, 5, 6, 7, as described in more detail below with reference to Fig. 10.

[0019] Fig. 10 shows a schematic view of the cross-section of the winding unit in the prior art when a winding conductor is applied.

[0020] In Fig. 10, the same parts as in Fig. 9 are designated with the same reference numerals, whereby, for the sake of clarity, reference numerals not required for the following description have been omitted compared to Fig. 9; reference numeral 8 designates a winding conductor and reference numeral 9 designates a cavity.

[0021] As shown in Fig. 10, when the winding conductor 8 is wound and bent around a rounded corner region R, which borders a side of the first edge length L in the winding direction W or is connected to a side of the first edge length L in the winding direction W (Fig. 10 shows the state during winding along the first side 4), the situation arises that, due to the first edge length L being larger than the second edge length K, the winding conductor 8 is not wound directly onto the side of the first edge length L, but rather a cavity 9 exists between the side of the first edge length L and the winding conductor 8. In other words, the winding conductor 8 has a bulge due to the existing cavity 9.

[0022] However, the bulging of the winding conductor 8 on the side of the first edge length L has adverse effects, such as a reduced copper fill factor and an impairment of the air and creepage distance between P231135 DE

[0023] - 4 - two adjacent winding units 1 of a stator or rotor of an electrical machine, thereby adversely affecting the overall performance of an electrical machine equipped with the winding unit 1.

[0024] From EP 2 309 626 A1, a winding method for forming windings on a winding body with a non-circular cross-section is known. To prevent bulges, which can occur when winding a conductor onto the longer straight sides of a winding body with a nearly rectangular cross-section, an elastic to plastic prestress is applied to the conductor upon contact with the winding body. This prestress is intended to counteract the bulges. However, the necessity of applying this elastic to plastic prestress to the conductor makes the winding method more complex overall.

[0025] Summary of the invention

[0026] Technical task

[0027] Accordingly, the object of the present invention is to create a winding unit with which bulges of a winding conductor wound onto the winding body can be reduced in a simple manner or ideally avoided.

[0028] Technical solution

[0029] The task will be solved using the measures specified in the independent claim.

[0030] Further advantageous embodiments of the present invention are the subject of the dependent claims.

[0031] According to one aspect, a winding unit for an electrical machine has a winding body which has a winding area with a cross-section in the shape of a P231135 DE

[0032] - 5 -

[0033] The polygon has multiple sides and multiple rounded corner regions. A first side of the multiple sides has a first edge length that is greater than a second edge length of a second side of the multiple sides. A winding conductor is wound onto the winding body in one winding direction along the multiple sides. Of the multiple rounded corner regions, a first rounded corner region adjacent to the first side in the winding direction has a larger radius of curvature than a second rounded corner region adjacent to the second side in the winding direction.

[0034] According to one embodiment, a third side of the multiple sides opposite the first side has the first edge length, and a fourth side of the multiple sides opposite the second side has the second edge length.

[0035] According to a further embodiment, the first rounded corner area connects the first side and the fourth side, and the first side and the fourth side form a first angle of the polygon that is less than 90°.

[0036] According to a further embodiment, the second rounded corner area connects the first side and the second side, forming a second angle of the polygon that is greater than 90°.

[0037] According to a further embodiment, a third rounded corner area of ​​the several rounded corner areas connects the second side and the third side together, and the second side and the third side form a third angle of the polygon that is less than 90°.

[0038] According to a further embodiment, a fourth rounded corner area of ​​the several rounded corner areas connects the third side and the fourth side together, and the third side and the fourth side form a fourth angle of the polygon that is greater than 90°.

[0039] According to another embodiment, the polygon is a rectangle. P231135 DE

[0040] - 6 -

[0041] According to a further embodiment, the first rounded corner area and the third rounded corner area each have the same radius of curvature, and the second rounded corner area and the fourth rounded corner area each have the same radius of curvature.

[0042] According to a further embodiment, the winding unit has a tooth of a stator or rotor of an electrical machine, onto which the winding body is applied.

[0043] According to a further embodiment, the tooth has a cross-section in the form of a polygon with several corner areas, and of the several corner areas, a first corner area is rounded, which is located closest to the first rounded corner area among the several corner areas.

[0044] According to a further embodiment, the first corner area has a larger radius of curvature than a second corner area of ​​the multiple corner areas, which is located closest to the second rounded corner area of ​​the multiple corner areas.

[0045] Advantageous effects of the invention

[0046] By means of the aforementioned aspect or its embodiments, due to the several rounded corner areas, of which the first rounded corner area, to which the first side adjoins in the winding direction, has a larger radius of curvature than a second rounded corner area, to which the second side adjoins in the winding direction, bulging of the winding conductor on the first side can be avoided or at least reduced when applying the winding conductor to the winding body, since the winding conductor is bent around the larger radius of curvature before being wound along the first side and can therefore conform better to the first side or be applied contour-conforming to the contour than in the prior art, without P231135 DE

[0047] - 7 - additional process engineering steps or measures are required for this. This simplifies the manufacturing process of the winding unit and improves the performance of an electric machine equipped with the winding unit.

[0048] By means of the aforementioned aspect or its embodiments, increased process reliability and higher speed can be achieved when winding the winding conductor compared to the state of the art.

[0049] Brief description of the drawings

[0050] The present invention is explained in more detail below with reference to the description of embodiments and the accompanying drawing.

[0051] The drawing shows:

[0052] Fig. 1 shows a schematic view of a cross-section of a winding unit according to a first embodiment of the present invention;

[0053] Fig. 2 shows a schematic view of the cross-section of the winding unit according to the first embodiment of the present invention when a winding conductor is applied;

[0054] Fig. 3 shows a schematic view of a cross-section of a winding unit according to a second embodiment of the present invention;

[0055] Fig. 4 shows a schematic view of a cross-section of a winding unit according to a third embodiment of the present invention;

[0056] Fig. 5 shows a schematic view of a cross-section of a winding unit according to a fourth embodiment of the present invention; P231135 DE

[0057] - 8 -

[0058] Fig. 6 shows a schematic view of the cross-section of the winding unit according to the fourth embodiment of the present invention when a winding conductor is applied;

[0059] Fig. 7 shows a schematic view of a cross-section of a winding unit according to a fifth embodiment of the present invention;

[0060] Fig. 8 shows a schematic view of a cross-section of a winding unit according to a sixth embodiment of the present invention;

[0061] Fig. 9 shows a schematic view of a cross-section of a winding unit in the prior art; and

[0062] Fig. 10 shows a schematic view of the cross-section of the winding unit in the prior art when a winding conductor is applied.

[0063] Description of the embodiments

[0064] The following is a description of a first embodiment.

[0065] Fig. 1 shows a schematic view of a cross-section of a winding unit according to the first embodiment of the present invention.

[0066] In Fig. 1, reference numeral 1 denotes a winding unit, reference numeral 2 denotes a winding body, reference numeral 3 denotes a tooth, reference numeral 4 denotes a first side of the winding body, reference numeral 5 denotes a second side of the winding body, reference numeral 6 denotes a third side of the winding body, reference numeral 7 denotes a fourth side of the winding body, reference numeral L denotes a first edge length of the winding body, reference numeral K denotes a second edge length of the winding body, and reference numeral r1 denotes a first corner region of the tooth. P231135 DE

[0067] - 9 - the reference numeral r2 denotes a second corner region of the tooth, the reference numeral r3 denotes a third corner region of the tooth, the reference numeral r4 denotes a fourth corner region of the tooth, the reference numeral R1 denotes a first rounded corner region of the winding body, the reference numeral R2 denotes a second rounded corner region of the winding body, the reference numeral R3 denotes a third rounded corner region of the winding body, the reference numeral R4 denotes a fourth rounded corner region of the winding body and the reference numeral W denotes a winding direction.

[0068] As shown in Fig. 1, the winding unit 1 includes the winding body 2, which is mounted on the tooth 3. The winding body 2 can, for example, be made of an electrically insulating material to contribute to the electrical insulation of a winding (not shown) mounted on it from the tooth 3. The tooth 3 can be a tooth of a stator or rotor of an electrical machine.

[0069] The winding body 2 has a winding area with a cross-section in the form of a rectangle with four sides, i.e., the first to fourth sides 4, 5, 6, 7, and four rounded corner areas, i.e., the first to fourth rounded corner areas R1, R2, R3, R4. The tooth also has a rectangular cross-section with four corner areas, i.e., the first to fourth corner areas r1, 2, r3, r4, which may optionally be rounded.

[0070] The first rounded corner region R1 and the third rounded corner region R3 of the winding body 2 preferably each have the same radius of curvature relative to each other, i.e., radius of curvature of R1 = radius of curvature of R3. Alternatively, the third rounded corner region R3 has a smaller radius of curvature than the first rounded corner region R1, i.e., radius of curvature of R3 < radius of curvature of R1. The second rounded corner region R2 and the fourth rounded corner region R4 of the winding body 2 preferably each have the same radius of curvature relative to each other, i.e., radius of curvature of R2 = radius of curvature of R4. P231135 DE

[0071] - 10 -

[0072] The possibly rounded corner areas of tooth 3 preferably each have the same radius of curvature relative to each other.

[0073] The first side 4 and the third side 6 of the winding body 2 have the first edge length L, and the second side 5 and the fourth side 7 of the winding body 2 have the second edge length K. The first edge length L is longer than the second edge length K. A winding conductor, not shown in Fig. 9 for clarity, is wound around the winding body 2 in the winding direction W along the first to fourth sides 4, 5, 6, 7, as described in more detail below with reference to Fig. 10.

[0074] The first rounded corner area R1, which in the winding direction W borders on or is connected to the first side 4 of the first edge length L, and the second rounded corner area R3, which in the winding direction W borders on or is connected to the third side 6 of the first edge length L, each have a larger radius of curvature than the second rounded corner area R2, which in the winding direction W borders on or is connected to the second side 5 of the second edge length K, and the fourth rounded corner area R4, which in the winding direction W borders on or is connected to the fourth side 7 of the second edge length K.

[0075] A winding conductor, not shown in Fig. 1 for clarity, is wound around the winding body 2 in the winding direction W along the first to fourth sides 4, 5, 6, 7, as described in more detail below with reference to Fig. 2.

[0076] Fig. 2 shows a schematic view of the cross-section of the winding unit according to the first embodiment of the present invention during the application of a winding conductor. P231135 DE

[0077] - 11 -

[0078] In Fig. 2, the same parts as in Fig. 1 are designated with the same reference numerals, whereby, for the sake of clarity, reference numerals not required for the following description have been omitted compared to Fig. 1, and reference numeral 8 designates a winding conductor.

[0079] As shown in Fig. 2, when winding the winding conductor 8, bending the winding conductor 8 around the first rounded corner region R1 and the third rounded corner region R3, which in the winding direction W adjoin the first side 4 and the third side 6 of the first edge length L respectively, where Fig. 2 shows the state when winding along the first side 4, the winding conductor 8 is wound directly onto the first side 4 and the third side 6 of the first edge length L due to the radii of curvature of the first rounded corner region R1 and the third rounded corner region R3, which are each larger than the radii of curvature of the second rounded corner region R2 and the fourth rounded corner region R4, so that there is no cavity or a cavity smaller than in the prior art between the first side 4 or the third side 6 of the first edge length L and the winding conductor 8.In other words, due to the absence of or the smaller cavity 9 compared to the prior art, the winding conductor 8 exhibits no bulging or reduced bulging compared to the prior art.

[0080] This improves the overall performance of an electric machine equipped with winding unit 1.

[0081] Instead of the previously described rectangular cross-section of the winding area of ​​the winding body 2, the winding body 2 can generally have a winding area with a polygonal cross-section with multiple sides and multiple rounded corner regions. In this case, generally speaking, one side, or first side of the multiple sides, has a first edge length L that is greater than the second edge length K of another side, or second side of the multiple sides, and has a rounded corner region, or first rounded corner region, to which, in the winding direction, one side of the first edge length L is attached.

[0082] - 12 - borders or is connected to the rounded corner area, has a larger radius of curvature than another rounded corner area or second rounded corner area, to which the other side of the second edge length K borders or is connected in the winding direction.

[0083] The following is a description of a second embodiment.

[0084] Fig. 3 shows a schematic view of a cross-section of a winding unit according to the second embodiment of the present invention.

[0085] In Fig. 3, the same or corresponding parts as in Fig. 1 and Fig. 2 are designated with the same reference numerals.

[0086] The second embodiment of the present invention is identical to the first embodiment of the present invention described above, except for the modifications described below.

[0087] As shown in Fig. 3, the first corner region r1 and the third corner region r3 of the tooth 3 are each rounded with a larger radius of curvature than the second corner region r2 and the fourth corner region r4 of the tooth 3.

[0088] The first corner area r1 is located closest to the rounded corner area R1 of the first to fourth corner areas r1 , 2, r3, r4, and the third corner area r3 is located closest to the rounded corner area R3 of the first to fourth corner areas r1 , 2, r3, r4.

[0089] This prevents the winding body 2 from having a smaller thickness in the area of ​​the first rounded corner region R1 and the second rounded corner region R3 compared to the other areas of the winding body 2, which would otherwise result from the larger radii of curvature of the first rounded corner region R1 and the second rounded corner region R3. P231135 DE

[0090] - 13 -

[0091] With regard to the generalized polygon previously explained concerning the first embodiment, this means that a corner region or first corner region of the several corner regions of the tooth 3, which is closest to the one or first rounded corner region of the several corner regions of the tooth 3, has a larger radius of curvature than another or second corner region of the several corner regions of the tooth 3, which is closest to the other or second rounded corner region of the several corner regions of the tooth 3.

[0092] The following is a description of a third embodiment.

[0093] Fig. 4 shows a schematic view of a cross-section of a winding unit according to the third embodiment of the present invention.

[0094] In Fig. 4, the same or corresponding parts as in Figs. 1 to 3 are designated with the same reference numerals.

[0095] The third embodiment of the present invention is identical to the first and second embodiments of the present invention described above, except for the modifications described below.

[0096] As shown in Fig. 4, the winding body 2 directly forms a tooth of a stator or rotor of an electric machine.

[0097] The following is a description of a fourth embodiment.

[0098] Fig. 5 shows a schematic view of a cross-section of a winding unit according to the fourth embodiment of the present invention.

[0099] In Fig. 5, the same or corresponding parts as in Figs. 1 to 4 are designated with the same reference numerals. P231135 DE

[0100] - 14 -

[0101] The fourth embodiment of the present invention is identical to the first embodiment of the present invention described above, except for the modifications described below.

[0102] As shown in Fig. 5, the third side 6 opposite the first side 4 has the first edge length L and the fourth side 7 opposite the second side 5 has the second edge length K.

[0103] The first rounded corner area R1 connects the first side 4 and the fourth side 7. The first side 4 and the fourth side 7 form a first angle that is less than 90°.

[0104] The second rounded corner area R2 connects the first side 4 and the second side 5. The first side 4 and the second side 5 form a second angle that is greater than 90°.

[0105] The third rounded corner area R3 connects the second side 5 and the third side 6. The second side 5 and the third side 6 form a third angle that is less than 90°.

[0106] The fourth rounded corner area R4 connects the third side 6 and the fourth side 7. The third side 6 and the fourth side 7 form a fourth angle greater than 90°.

[0107] Fig. 6 shows a schematic view of the cross-section of the winding unit according to the fourth embodiment of the present invention when a winding conductor is applied.

[0108] In Fig. 6, the same parts as in Fig. 5 are designated with the same reference numerals, whereby, for the sake of clarity, reference numerals not required for the following description have been omitted compared to Fig. 5, and reference numeral 8 designates a winding conductor. P231135 DE

[0109] - 15 -

[0110] As shown in Fig. 6, when winding the winding conductor 8, bending the winding conductor 8 around the first rounded corner region R1 and the third rounded corner region R3, which in the winding direction W adjoin the first side 4 and the third side 6 of the first edge length L respectively, where Fig. 6 shows the state during winding along the first side 4, the winding conductor 8 is wound directly onto the first side 4 and the third side 6 of the first edge length L due to the radii of curvature of the first rounded corner region R1 and the third rounded corner region R3, which are each larger than the radii of curvature of the second rounded corner region R2 and the fourth rounded corner region R4, so that there is no cavity or a cavity smaller than in the prior art between the first side 4 or the third side 6 of the first edge length L and the winding conductor 8.

[0111] The first angle, which is less than 90°, and the fourth angle, which is greater than 90°, result in a shape along the fourth side 7 of the second edge length K such that the first rounded corner region R1 is more raised compared to the fourth rounded corner region R4, i.e., that the first rounded corner region R1 protrudes further from the coil body 2 than the fourth rounded corner region R4.

[0112] The third angle, which is less than 90°, and the second angle, which is greater than 90°, result in a shape along the second side 5 of the second edge length K such that the third rounded corner region R3 is more raised compared to the second rounded corner region R2, i.e., the third rounded corner region R3 protrudes further from the coil body 2 than the second rounded corner region R2.

[0113] This further supports the fact that, when winding the winding conductor 8, no cavity or a cavity smaller than in the prior art is formed between the first side 4 or the third side 6 of the first edge length L and the winding conductor 8. P231135 DE

[0114] - 16 -

[0115] In other words, due to the absence of or the smaller cavity 9 compared to the prior art, the winding conductor 8 exhibits no bulging or reduced bulging compared to the prior art.

[0116] This improves the overall performance of an electric machine equipped with winding unit 1.

[0117] The following is a description of a fifth embodiment.

[0118] Fig. 7 shows a schematic view of a cross-section of a winding unit according to the fifth embodiment of the present invention.

[0119] In Fig. 7, the same or corresponding parts as in Figs. 1 to 6 are designated with the same reference numerals.

[0120] The fifth embodiment of the present invention is identical to the fourth embodiment of the present invention described above, except for the modifications described below.

[0121] As shown in Fig. 3, the first corner region r1 and the third corner region r3 of the tooth 3 are each rounded with a larger radius of curvature than the second corner region r2 and the fourth corner region r4 of the tooth 3.

[0122] The first corner area r1 is located closest to the rounded corner area R1 of the first to fourth corner areas r1 , 2, r3, r4, and the third corner area r3 is located closest to the rounded corner area R3 of the first to fourth corner areas r1 , 2, r3, r4.

[0123] This prevents the winding body 2 from having a smaller thickness in the area of ​​the first rounded corner region R1 and the second rounded corner region R3 compared to the other areas of the winding body 2, P231135 DE

[0124] - 17 - which would otherwise result from the larger radii of curvature of the first rounded corner area R1 and the second rounded corner area R3.

[0125] With regard to the generalized polygon previously explained concerning the first and fourth embodiments, this means that a corner region or first corner region of the several corner regions of the tooth 3, which is closest to the one or first rounded corner region, has a larger radius of curvature than another or second corner region of the several corner regions of the tooth 3, which is closest to the other or second rounded corner region.

[0126] The following is a description of a sixth embodiment.

[0127] Fig. 8 shows a schematic view of a cross-section of a winding unit according to the sixth embodiment of the present invention.

[0128] In Fig. 8, the same or corresponding parts as in Figs. 1 to 7 are designated with the same reference numerals.

[0129] The sixth embodiment of the present invention is identical to the fourth and fifth embodiments of the present invention described above, except for the modifications described below.

[0130] As shown in Fig. 8, the winding body 2 directly forms a tooth of a stator or rotor of an electric machine.

[0131] Although the present invention has been described above with reference to embodiments, it is understood that various embodiments and modifications can be implemented without departing from the scope of the present invention as defined in the accompanying claims. P231135 DE

[0132] - 18 -

[0133] Regarding further features and advantages of the present invention, explicit reference is made to the disclosure of the drawing.

[0134] Commercial applicability

[0135] The present invention is applicable as a winding unit of a stator or rotor of an electrical machine.

[0136] P231135 DE

[0137] - 19 -

[0138] List of reference symbols

[0139] 1 winding unit

[0140] 2 winding bodies

[0141] 3 teeth

[0142] 4 first side of the wrapping body

[0143] 5 second side of the wrapping body

[0144] 6. Third side of the coil body

[0145] 7 fourth side of the wrapping body

[0146] 8 winding conductors

[0147] 9 Cavity

[0148] L first edge length

[0149] K second edge length r corner area of ​​the tooth

[0150] R Corner region of the coil body r1 First corner region of the tooth r2 Second corner region of the tooth r3 Third corner region of the tooth r4 Fourth corner region of the tooth

[0151] R1 first rounded corner area of ​​the winding body

[0152] R2 second rounded corner area of ​​the winding body

[0153] R3 third rounded corner area of ​​the winding body

[0154] R4 fourth rounded corner area of ​​the winding body

[0155] W winding direction

Claims

1. P231135 DE - 20 - Claims 1. Winding unit (1) for an electrical machine, the winding unit (1) comprising: a winding body (2) having a winding area with a cross-section in the form of a polygon with several sides (4, 5, 6, 7) and with several rounded corner regions (R1, R2, R3, R4), wherein a first side (4) of the several sides (4, 5, 6, 7) has a first edge length (L) that is greater than a second edge length (K) of a second side (5) of the several sides (4, 5, 6, 7), and a winding conductor (8) that is wound in a winding direction (W) along the several sides (4, 5, 6, 7) onto the winding body (2), wherein of the several rounded corner regions (R1, R2, R3, R4) a first rounded corner region (R1), to which the first side (4) adjoins in the winding direction (W), has a larger The radius of curvature is a second rounded corner area (R2) to which the second side (5) adjoins in the winding direction (W).

2. Winding unit (1) according to claim 1, wherein a third side (6) of the multiple sides (4, 5, 6, 7) opposite the first side (4) has the first edge length (L) and a fourth side (7) of the multiple sides (4, 5, 6, 7) opposite the second side (5) has the second edge length (K).

3. Winding unit (1 ) according to claim 2, wherein the first rounded corner region (R1 ) connects the first side (4) and the fourth side (7) and the first side (4) and the fourth side (7) form a first angle of the polygon which is less than 90°.

4. Winding unit (1) according to claim 2 or 3, wherein the second rounded corner area (R2) connects the first side (4) and the second side (5) together and P231135 DE - 21 - the first side (4) and the second side (5) form a second angle of the polygon that is greater than 90°.

5. Winding unit (1) according to one of claims 2 to 4, wherein a third rounded corner region (R3) of the several rounded corner regions (R1 , R2, R3, R4) connects the second side (5) and the third side (6) together and the second side (5) and the third side (6) form a third angle of the polygon which is less than 90°.

6. Winding unit (1) according to one of claims 2 to 5, wherein a fourth rounded corner region (R4) of the several rounded corner regions (R1 , R2, R3, R4) connects the third side (6) and the fourth side (7) together and the third side (6) and the fourth side (7) form a fourth angle of the polygon which is greater than 90°.

7. Winding unit (1) according to claim 2, wherein the polygon is a rectangle.

8. Winding unit (1) according to one of claims 2 to 7, wherein the first rounded corner area (R1) and the third rounded corner area (R3) each have the same radius of curvature and the second rounded corner area (R2) and the fourth rounded corner area (R4) each have the same radius of curvature.

9. Winding unit (1 ) according to one of claims 1 to 8, comprising a tooth (3) of a stator or rotor of an electrical machine, onto which the winding body (2) is applied.

10. Winding unit (1) according to claim 9, wherein the tooth (3) has a cross-section in the form of a polygon with several corner regions (r1 , r2, r3, r4) and P231135 DE - 22 - of the multiple corner regions (r1 , r2, r3, r4) a first corner region is rounded, which of the multiple corner regions (r1 , r2, r3, r4) is located closest to the first rounded corner region (R1 ).

11. Winding unit according to claim 10, wherein the first corner region (r1 ) has a larger radius of curvature than a second corner region (r2) of the multiple corner regions (r1 , r2 , r3, r4), which of the multiple corner regions (r1 , r2 , r3, r4) is located closest to the second rounded corner region (R2).

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