Stator of an electric machine

Abstract

The invention relates to a stator of an electric machine (2), having a stator axis (3) and having a stator plate group (4) on which stator teeth (5) and stator slots (6) located between the stator teeth (5) are formed, a single conductor (8) or a conductor bundle (9) comprising a plurality of conductors (8) being arranged in each of the stator slots (6) in order to form an electric stator winding (10), at least one slot gap (12) is provided between a slot flank (6f) of the respective stator slot (6) and a conductor (8) or a conductor bundle (9) arranged in the stator slot (6), said slot gap forming a slot gap channel (13) extending in the axial direction, through which a cooling medium can flow along a slot cooling path (14), characterized in that the slot gap channel (13) extends in the axial direction and through which the cooling medium can flow along the slot cooling path (14), according to the invention, at least one supply path (15) is formed in the stator plate group (4), which in each case opens into at least one of the stator slots (6) in order to supply a cooling medium to at least one slot cooling path (14), a respective supply path (15) opens into a slot inlet (14.1) of the respective stator slot (6) with a radial channel (15.1) and comprises, upstream of the radial channel (15.1), at least one yoke channel (15.2), which extends in the axial direction in the stator yoke (7) and is provided for cooling the stator yoke (7).

Description

Technical Field

[0001] The invention relates to a stator for an electric machine according to the preambles of the independent claims. Background Art

[0002] DE 10 2019 113 785 A1 already discloses a stator for an electric motor, the stator comprising a stator axis and a stator sheet metal assembly, stator teeth and stator slots located between the stator teeth being formed on the stator sheet metal assembly, and the stator sheet metal assembly comprising a stator yoke connecting the stator teeth, wherein the stator slots extend in a radial direction with respect to the stator axis between a slot bottom and a slot head, wherein a single conductor or a conductor bundle comprising a plurality of conductors, in particular a stack of flat conductors, is respectively arranged in the stator slots for forming an electric stator winding, wherein at least one slot gap is provided between a slot side of the respective stator slot and the conductor or conductor bundle arranged in the stator slot, the at least one slot gap forming a slot gap channel extending in the axial direction for direct cooling of the conductor, wherein a coolant can flow through the slot gap channel along a slot cooling path. Summary of the Invention

[0003] In contrast, the stator of an electric machine according to the present invention, having the characterizing features of the independent claims, offers the following advantages: Stator cooling is further improved. Furthermore, in addition to direct conductor cooling, jacket cooling of the stator yoke can be provided. Because the coolant is conveyed directly through the stator yoke, cooling channels in the stator housing surrounding the stator, which would require complex and expensive production, can be eliminated. This reduces manufacturing costs.

[0004] According to the invention, this is achieved by: - at least one supply path is formed in the stator sheet-metal package, which in each case opens into at least one of the stator slots for supplying coolant to at least one slot cooling path, The respective supply path opens into the slot inlet of the respective stator slot with a radial channel and comprises upstream of the radial channel at least one yoke channel which runs in the stator yoke in the axial direction and is provided for cooling the stator yoke.

[0005] Advantageous embodiments and improvements of the stator of the electric machine specified in the independent claim are achieved by the measures listed in the dependent claims.

[0006] It is particularly advantageous if the plurality of yoke channels of the at least one supply path are distributed in the circumferential direction of the stator yoke and form a jacket cooling portion of the stator yoke. In this way, uniform cooling of the stator yoke in the circumferential direction of the stator yoke is achieved.

[0007] It is further advantageous if, according to the first embodiment, several of the yoke channels are through-channels, each of which completely penetrates the stator sheet metal package in the axial direction and each of which has at least one inlet opening into the corresponding radial channel, the at least one inlet being particularly arranged in the region of or at the axial center of the through-channel. In this way, flow flows through the stator yoke in the axial direction, thereby achieving uniform cooling of the stator yoke in the axial direction.

[0008] Advantageously, according to the second embodiment, several of the yoke channels are short channels. These short channels extend axially from at least one of the two end faces of the stator sheet metal assembly to the inlet opening into the corresponding radial channel and are shorter than the through-channels, particularly extending into the axial center region of the stator sheet metal assembly. In a first variant of the second embodiment (in which only short channels are provided, extending from only one of the two end faces of the stator sheet metal assembly), partial jacket cooling of the stator yoke is achieved, encompassing only an axial portion of the stator yoke. This first variant is particularly simple and cost-effective to implement. In a second variant of the second embodiment (in which short channels are provided, extending from both end faces of the stator sheet metal assembly), full jacket cooling of the stator yoke is achieved, encompassing substantially the entire stator yoke. However, this second variant of the second embodiment requires a coolant supply from both end faces of the stator sheet metal assembly.

[0009] It is also advantageous that, according to the third embodiment, multiple pairs of yoke channels are provided and distributed around the circumference of the stator yoke, wherein the yoke channels of each pair extend from the same end face of the stator sheet metal assembly and are adjacent in the circumferential direction. One yoke channel in each pair is a short channel, and the other yoke channel is a serpentine channel. The respective serpentine channel includes a through section, a deflection section, and a short section. For each pair of yoke channels, the short channel and the short section of the serpentine channel are arranged in pairs relative to each other, in particular, at the same circumferential position. In this manner, full jacket cooling of the stator yoke is essentially achieved, which substantially encompasses the entire stator yoke, but advantageously requires a supply of cooling medium from only one of the two end faces of the stator sheet metal assembly.

[0010] Furthermore, it is advantageous if the deflection sections of the serpentine channels are formed according to the third embodiment in the stator sheet-metal assembly or in a deflection device that is arranged at the end of the stator sheet-metal assembly. This allows for simple deflection of the serpentine channels. The deflection device can be designed, for example, in an annular or disk-shaped manner and include the deflection sections of all the serpentine channels.

[0011] Furthermore, it is advantageous to arrange an annular distribution channel on at least one of the two end faces of the stator sheet metal assembly. This distribution channel opens into the yoke channel and is provided for supplying the supply path with coolant. The distribution channel distributes the coolant in the circumferential direction to the yoke channels distributed along the circumference. This enables a simple supply of coolant to the supply path.

[0012] Advantageously, two slot cooling paths extending in opposite directions are provided in the respective stator slots, each of which exits as a free jet at the end of the respective stator slot via a slot outlet, particularly at the slot head or slot bottom. This simplifies the cooling path in the stator with respect to the flow connection of the slot gap channels or slot cooling paths. In particular, an annular collector is no longer necessary at the end face of the stator sheet metal assembly to collect the coolant flowing out of the slot gap channels, which would require sealing the stator space from the rotor space of the electric machine, for example, using a sleeve or a gap tube. Furthermore, the flow connection of the slot gap channels according to the present invention enables lower pressures in the cooling paths, thereby reducing the sealing requirements for the slot gap channels. Furthermore, because the respective cooling paths extend not over their entire length, but only over a portion of the axial length of the respective stator slots, pressure losses in the respective cooling paths are reduced.

[0013] According to an advantageous embodiment, the radial channels of the respective supply paths are formed by punchings or recesses in a single sheet metal core of the stator sheet metal package or by a plurality of radial channel segments which are radially offset in a plurality of adjacent sheet metal cores and partially overlap in the radial direction. This makes it possible to produce radial channels in the stator sheet metal package in a simple and cost-effective manner.

[0014] It is further advantageous if a plurality of support points, spaced apart from one another in the axial direction with respect to the stator axis, are formed in each of the stator slots for clamping the conductor or conductor bundle located in the corresponding stator slot. The support points are each formed by twisting one or more sheet metal laminations, in particular one or more groups of sheet metal laminations, of the stator sheet metal assembly. This allows the support points to be created without the need for special laminations, and the conductor bundle can be inserted into the stator slot without clamping forces during assembly. This reduces the manufacturing costs of the stator. Furthermore, damage to the conductor bundle is avoided during insertion into the corresponding stator slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Several exemplary embodiments of the invention are shown simplified in the drawings and are explained in more detail in the following description.

[0016] Figure 1 shows a side view of a portion of a stator according to the invention, Figure 2AAlong the Figure 1 A cross-sectional view of the stator according to the present invention according to the first embodiment is shown when the stator is cut along line II-II in FIG. Figure 2B The linear expansion diagram shows the Figure 2A The first embodiment of the invention is based on Figure 1 a plurality of yoke channels in the yoke channel of the stator according to the present invention, Figure 3A Along the Figure 1 FIG. 1 shows a cross-sectional view of a stator according to the present invention according to a second embodiment, taken along line II-II in FIG. 1 . Figure 3B The linear expansion diagram shows the Figure 3A The second embodiment of the invention is in accordance with Figure 1 a plurality of yoke channels in the yoke channel of the stator according to the present invention, Figure 4A The linear expansion diagram shows the Figure 1 a plurality of yoke channels in the yoke channel of the stator according to the present invention, Figure 4B Along the Figure 4A The stator is cut along line IV-IV. Figure 4A a first sectional view of a stator according to the invention of a third embodiment, Figure 4C Along the Figure 4A The stator is cut along line IV-IV. Figure 4A A second sectional view of a stator according to the present invention of a third embodiment, Figure 5A shows an embodiment of a first sheet metal core with channel sections for producing radial channels in the stator sheet metal core, Figure 5B shows an embodiment of a second sheet metal core with channel sections for producing radial channels in the stator sheet metal core. Figure 5C Show the basis Figure 5A and 5B an arrangement of first and second sheet metal laminations for producing radial channels in the stator sheet metal package, Figure 6 Shown along Figure 2A The groove cross section of line VI-VI, Figure 7 Shown along Figure 2A The groove cross section of line VII-VII, Figure 8 Shown along Figure 2A The groove cross section of line VIII-VIII, Figure 9 One of the stator slots of a stator according to the invention is shown in section with a conductor bundle supported at a plurality of support points, Figure 10 A detail of a stator according to the invention is shown with twisted laminations for producing support points for conductor bundles. DETAILED DESCRIPTION

[0017] Figure 1 Shown is a side view of a portion of a stator according to the invention.

[0018] The stator 1 according to the invention of the electric machine 2 has a stator axis 3 and a stator sheet metal package 4, on which stator teeth 5 and stator slots 6 located between the stator teeth 5 are formed, and which includes a stator yoke 7 connecting the stator teeth 5. The stator slots 6 extend in the radial direction with respect to the stator axis 3 between a slot base 6g and a slot head 6h and can each have a slot gap 6s in the slot head 6h.

[0019] In each of the stator slots 6 , a single electrical conductor 8 or a conductor bundle 9 comprising a plurality of conductors 8 , in particular a stack of flat conductors, is arranged in order to form an electrical stator winding 10 .

[0020] At least one slot gap 12 is provided between the slot side 6 f of the respective stator slot 6 and the conductor 8 or conductor bundle 9 arranged in the stator slot 6 , which slot gap forms a slot gap channel 13 extending in the axial direction with respect to the stator axis 3 and through which a coolant can flow along a slot cooling path 14 .

[0021] Figure 2A Along the Figure 1 1 is a cross-sectional view of the stator according to the present invention according to the first embodiment, with the stator cut along line II-II in FIG.

[0022] The stator sheet metal package 4 is formed by a stack of sheet metal cores 16 .

[0023] Two slot cooling paths 14 extending in opposite directions are provided in the respective stator slot 6 and exit as free jets at the end of the respective stator slot 6 via a slot outlet 14.2, in particular in the slot head 6h or the slot bottom 6g. The stator slot 6 can be closed by means of at least one slot closure 19 for sealing the slot cooling paths 14. The slot closure can be, for example, Figure 1 as well as Figures 6 to 8This can be achieved by implementing a single sleeve-shaped or tubular slot closure as a separate element for closing all slot gaps 6s. According to a second variant (not shown), a strip-shaped slot closure, in particular a cover slide, can be provided as a separate element in each slot gap 6s. According to a third variant (not shown), the slot closures 19 can each be formed by a tooth tip bridge, which is part of the sheet metal core 16, connects the tooth tips of adjacent stator teeth 5, and has, in particular, reduced magnetic permeability.

[0024] According to the invention, at least one supply path 15 is formed in the stator sheet-metal package 4 , which in each case opens into at least one of the stator slots 6 for supplying coolant to at least one slot cooling path 14 .

[0025] Furthermore, according to the present invention, the corresponding supply path 15 opens into the slot inlet 14.1 of the corresponding stator slot 6 with a radial channel 15.1 extending in the radial direction and includes at least one yoke channel 15.2 upstream of the radial channel 15.1, which extends in the stator yoke 7 in the axial direction and is provided for cooling the stator yoke 7.

[0026] Figure 2B The linear expansion diagram shows the Figure 2A The first embodiment of the invention is based on Figure 1 A plurality of yoke channels in the yoke channel of the stator according to the present invention.

[0027] For example, a plurality of yoke channels 15 . 2 of the at least one supply path 15 are distributed over the circumference of the stator yoke 7 and in this way form a jacket cooling in the stator yoke 7 .

[0028] According to the first embodiment, a plurality of yoke channels 15.2 are designed as through-channels 23, which each completely penetrate the stator sheet metal package 4 in the axial direction and each have at least one inlet 17 leading into the corresponding radial channel 15.1. The inlet 17 is arranged, for example, in the region of the axial center of the through-channel 23, in particular at the axial center.

[0029] An annular distribution channel 20 can be arranged on each of the two end faces of the stator sheet-metal package 4 , which distribution channel opens into the corresponding yoke channel 15 . 2 and is provided for supplying the supply path 15 with coolant.

[0030] Figure 3A Along the Figure 1 A cross-sectional view of the stator according to the present invention according to the second embodiment is shown with the stator cut along line II-II in FIG. Figure 3B The linear expansion diagram shows the Figure 3A The second embodiment of the invention is in accordance with Figure 1 A plurality of yoke channels in the yoke channel of the stator according to the present invention.

[0031] According to the second embodiment, a plurality of yoke channels 15 . 2 are configured as short channels 24 , which extend from at least one of the two end faces of the stator sheet-metal package 4 in the axial direction to an inlet into the corresponding radial channel and are configured shorter than the through-channels 23 , in particular extending into the axial central region of the stator sheet-metal package 4 .

[0032] According to a first variant of the second embodiment, not shown, only short channels 24 can be provided, which extend only from one of the two end faces of the stator sheet metal package 4 and thus realize a partial jacket cooling, which only covers an axial part of the stator yoke 7. Figure 3A and Figure 3B In the second variant shown in FIG, short channels 24 can also be provided, extending from both end faces of the stator sheet metal package 4. This second variant realizes full jacket cooling, which essentially surrounds the entire stator yoke 7. In this second variant, an annular distribution channel 20 can be provided at each of the two end faces of the stator sheet metal package 4, which opens into the corresponding yoke channel 15.2 and is provided for supplying the supply path 15 with coolant.

[0033] The short channels 24 originating from one end face of the stator sheet metal package 4 and the short channels 24 originating from the other end face are aligned in pairs with respect to circumferential position, for example, and are particularly arranged opposite each other in pairs or in pairs at the same circumferential position.

[0034] Figure 4A The linear expansion diagram shows the Figure 1 A plurality of yoke channels in the yoke channel of the stator according to the present invention.

[0035] Figure 4B Along the Figure 4A The stator is cut along line IV-IV. Figure 4A A first sectional view of a stator according to the present invention of a third embodiment.

[0036] Figure 4C Along the Figure 4A The stator is cut along line IV-IV. Figure 4A A second sectional view of a stator according to the present invention of a third embodiment.

[0037] According to a third embodiment, multiple pairs 15.2p of yoke channels 15.2 of different lengths are provided and distributed around the circumference of the stator yoke 7. The yoke channels 15.2 of each pair 15.2p extend from the same end face of the stator sheet metal assembly 4 and are adjacent to each other in the circumferential direction. One of the yoke channels 15.2 of each pair 15.2p is a short channel 24, and the other yoke channel of the same pair 15.2p is a serpentine channel 25 comprising a through section 25.1, a deflection section 25.2, and a short section 25.3. An annular distribution channel 20 may be arranged at the end face of the stator sheet metal assembly 4 from which the yoke channels 15.2 extend. This distribution channel opens into the respective yoke channel 15.2 and is provided for supplying the supply path 15 with coolant.

[0038] For each pair 15 . 2 p of yoke channels 15 . 2 , the short channels 24 and the short sections 25 . 3 of the meandering channels 25 are arranged opposite each other in pairs, in particular in the same circumferential position.

[0039] In this manner, the third embodiment realizes a full jacket cooling portion that substantially covers the entire stator yoke 7 .

[0040] The turning section 25.2 of the serpentine channel 25 can be adjusted according to Figure 4A It is formed in a deflection device 26 or in a manner not shown in the stator sheet-metal package 4, which is arranged at the end face of the stator sheet-metal package 4. The deflection device 26 can be designed, for example, in an annular or disk-shaped manner and include the deflection sections of all the meandering channels.

[0041] Figure 5A An embodiment of a first sheet-metal core stack having channel sections for producing radial channels in the stator sheet-metal core is shown.

[0042] Figure 5B An embodiment of a second sheet-metal core stack is shown having channel sections for producing radial channels in the stator sheet-metal core.

[0043] Figure 5C Show the basis Figure 5A and 5B The first and second sheet metal laminations are arranged to produce radial channels in the stator sheet metal package.

[0044] The radial channels 15.1 of the respective supply paths 15 can be formed in different ways. Figures 5A to 5C , it can be formed by a plurality of radial channel segments 18, which are radially offset in a plurality of adjacent sheet metal cores 16 and partially overlap in the radial direction. Alternatively, the radial channel 15.1 can also be produced, for example, by punching holes or recesses in a single sheet metal core 16 of the stator sheet metal package 4.

[0045] Figure 6 Shown along Figure 2A The groove cross section of line VI-VI, Figure 7 Shown along Figure 2A The groove cross section of line VII-VII, and Figure 8 Shown along Figure 2A Slot cross section along line VIII-VIII.

[0046] Figure 9 A detail of a stator according to the invention is shown with twisted laminations for producing support points for conductor bundles.

[0047] A plurality of support points 11 spaced apart from one another in the axial direction with respect to the stator axis 3 are formed in each of the stator slots 6 for clamping and holding the conductors 8 or conductor bundles 9 located in the respective stator slots 6 . Figure 10 The support points 11 can each be formed by twisting one or more sheet metal laminations 16 of the stator sheet metal package 4, in particular one or more groups 28 of sheet metal laminations 16. The twisted sheet metal laminations 16 are twisted about the stator axis 3 (in the opposite direction) relative to the remaining sheet metal laminations 16 of the stator sheet metal package 4, for example by a specific twist angle. , for forming a single support location in the support location 11. The respective support location 11 is formed, for example, by two groups 28 of sheet metal laminations 16, which are twisted in opposite directions around the stator axis 3 by a specific twist angle. The conductors 8 or conductor bundles 9 of the respective stator slots 6 are supported between the support points 11 according to the invention in a freely floating manner, i.e. without contact with the stator sheet-metal core 4 . Therefore, the conductors 8 or conductor bundles 9 of the respective stator slots 6 are in contact with the stator sheet-metal core 4 only at the support points 11 .

[0048] The respective slot cooling path 14 is narrowed at least at the support point 11. Therefore, a bypass 21 is provided at each support point 11 in order to guide the cooling medium through the respective narrowed support point 11. In this case, the bypass 21 of the respective stator slot 6 is formed starting from the respective slot inlet 14.1 along the respective slot cooling path 14, for example, alternately in the slot bottom 6g or in the slot head 6h ( Figure 2A 、 Figure 6 and Figure 8 ), whereby a meandering direction of the slot cooling path 14 can be achieved.

[0049] The corresponding bypass 21 in the tank bottom 6g can be Figure 6 For example, it is formed by one or two notches in the slot flank 6 f at the base of the stator tooth 5 or by a notch in the slot base 6 g.

[0050] For according to Figure 2A 、 Figure 6 and Figure 8 The corresponding stator slots 6 and the corresponding slot closures 19 each have a plurality of axially spaced barriers 22 for adjusting the meandering slot cooling path 14. The barriers 22 extend, in particular, up to or near the conductor 8 or conductor bundle 9. A passage extending in the axial direction is formed between adjacent barriers 22 of the same stator slot 6 as a bypass 21 for the corresponding slot cooling path. Figure 6 and Figure 7 One of the stops 22 of the respective slot closure 19 is shown.

Claims

1. A stator of an electric motor (2), the stator having a stator axis (3) and a stator sheet metal assembly (4), stator teeth (5) and stator slots (6) located between the stator teeth (5) being formed on the stator sheet metal assembly, and the stator sheet metal assembly including a stator yoke (7) connecting the stator teeth (5), wherein: The stator slots (6) extend in radial direction with respect to the stator axis (3) between a slot bottom (6g) and a slot head (6h), wherein a single conductor (8) or a conductor bundle (9) comprising a plurality of conductors (8), in particular a stack of flat conductors, is arranged in each of the stator slots (6) for forming an electric stator winding (10), wherein at least one slot gap (12) is provided between a slot side (6f) of the respective stator slot (6) and the conductor (8) or conductor bundle (9) arranged in the stator slot (6), the at least one slot gap forming a slot gap channel (13) extending in the axial direction, wherein a cooling medium can flow through the slot gap channel along a slot cooling path (14), characterized in that - at least one supply path (15) is formed in the stator sheet metal package (4), which in each case opens into at least one of the stator slots (6) for supplying a coolant to at least one slot cooling path (14), - The respective supply path (15) opens into the slot inlet (14.1) of the respective stator slot (6) with a radial channel (15.1) and comprises, upstream of the radial channel (15.1), at least one yoke channel (15.2), which extends in the axial direction in the stator yoke (7) and is provided for cooling the stator yoke (7).

2. The stator according to claim 1, characterized in that The plurality of yoke channels (15.2) of the at least one supply path (15) are distributed in the circumferential direction of the stator yoke (7) and form a jacket cooling portion of the stator yoke (7).

3. The stator according to claim 2, characterized in that A plurality of yoke channels in the yoke channel (15.2) are through-channels (23), each of which completely passes through the stator sheet metal assembly (4) in the axial direction and each of which has at least one inlet (17) leading to a corresponding radial channel (15.1), the at least one inlet being particularly arranged in the region of or on the axial center of the through-channel (15.2).

4. The stator according to claim 2, characterized in that A plurality of the yoke channels (15.2) are short channels (24), which extend from at least one of the two end faces of the stator sheet metal assembly (4) in the axial direction to an inlet (17) leading into the corresponding radial channel (15.1), and are constructed to be shorter than the through-channel (23), in particular extending to the axial center region of the stator sheet metal assembly (4).

5. The stator according to claim 4, characterized in that A plurality of pairs (15.2p) of yoke channels (15.2) are arranged and distributed in the circumferential direction of the stator yoke (7), wherein the yoke channels (15.2) of each pair (15.2p) extend from the same end face of the stator sheet metal assembly (4) and are adjacent in the circumferential direction, wherein one yoke channel in each pair (15.2p) of yoke channels (15.2) is a short channel (24) and the other yoke channel in the yoke channels (15.2) is a serpentine channel (25), wherein the corresponding serpentine channel (25) includes a through section (25.1), a deflection section (25.2) and a short section (25.3), wherein, for each pair (15.2p) of yoke channels (15.2), the short channel (24) and the short section (25.3) of the serpentine channel (25) are arranged in pairs relative to each other, in particular, in the same circumferential position.

6. The stator according to claim 5, characterized in that The deflection section (25.2) of the meandering channel (25) is formed in the stator sheet-metal assembly (4) or in a deflection device (26) which is arranged at the end face of the stator sheet-metal assembly (4).

7. A stator according to any one of the preceding claims, characterized in that An annular distribution channel (20) is arranged at least on one of the two end faces of the stator sheet metal package (4), the distribution channel opening into the yoke channel (15.2) and being provided for supplying the supply path (15) with a coolant.

8. The stator according to any one of the preceding claims, characterized in that: Two slot cooling paths (14) extending in opposite directions are provided in the respective stator slot (6), which exit as free jets at the ends of the respective stator slot (6) via slot outlets (14.2), in particular in the slot head (6h) or the slot bottom (6g).

9. A stator according to any one of the preceding claims, characterized in that The radial channels (15.1) of the respective supply paths (15) are formed by punchings or recesses in a single sheet metal core (16) of the stator sheet metal package (4) or by a plurality of radial channel segments (18) which are radially offset in a plurality of adjacent sheet metal cores (16) and partially overlap in the radial direction.

10. A stator according to any one of the preceding claims, characterised in that The stator slot (6) is closed by means of at least one slot closure (19) in order to seal the slot cooling path (14).

11. A stator according to any one of the preceding claims, characterized in that A plurality of support locations (11) spaced apart from one another in the axial direction with respect to the stator axis (3) are formed in the stator slots (6) for clamping a conductor (8) or a conductor bundle (9) located in the corresponding stator slots (6), wherein the support locations (11) are formed by twisting one or more sheet metal laminations (16), in particular one or more groups (28) of sheet metal laminations (16), of the stator sheet metal package (4).

12. An electric machine (2) having a stator (1) according to any one of the preceding claims.

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