Stator of an electric machine

Abstract

Proposed is a stator of an electric machine (2), having a laminated stator core (3) and having a stator winding (4) which extends through stator slots (5) in the laminated stator core (3), wherein: the laminated stator core (3) comprises a plurality of partial cores (13); the partial cores (13) each comprise a stack of fixedly interconnected laminations (14); and at least two of the partial cores (13) are rotationally offset with respect to one another about a stator axis (10) in order to locally clamp conductor bundles (6) of the stator winding (4) which are situated in the stator slots (5); characterized in that - the partial cores (13) each have a plurality of axial holes (15) which are arranged along the circumferential direction and are formed by lamination holes (16) in the laminations (14), wherein the lamination holes (16) each have a hole edge (17), - at least one axial hole (15) of at least one partial core (13) has at least one hole edge (17k) of a lamination hole (16), which protrudes into said axial hole (15), and - at least one protruding hole edge (17k) of at least one partial core (13) is plastically deformed, in particular bent, into an axial hole (15) of an adjacent partial core (13) in order to fix the rotational position of a rotationally offset partial core (13) in the laminated stator core (3) and in particular in order to fixedly join two adjacent partial cores (13).

Description

[0001] Description

[0002] title

[0003] Stator of an electrical machine

[0004] State of the art

[0005] The invention is based on a stator of an electrical machine according to the preamble of the main claim.

[0006] A stator of an electrical machine is already known from DE102021204202 A1, comprising a stator core and a stator winding that runs through stator slots of the stator core. The stator core has several sub-packets, each comprising a stack of firmly connected, in particular glued or stamped, laminations. At least two of the sub-packets are rotated relative to each other about a stator axis for locally clamping conductor bundles of the stator winding located in the stator slots.

[0007] Advantages of the invention

[0008] The stator of an electrical machine according to the invention with the characterizing features of the main claim has the advantage that the rotational position of the rotated partial packages in the stator laminated core is fixed in a simple manner.

[0009] This is achieved according to the invention in that the sub-packets each have a plurality of axial holes arranged along the circumferential direction, which are formed by lamination holes in the laminations, wherein the lamination holes each have a hole edge. At least one axial hole of at least one sub-packet has at least one hole edge of a lamination hole protruding into the respective axial hole. At least one protruding hole edge of at least one sub-packet is plastically deformed, in particular bent, into an axial hole of a respective adjacent sub-packet in order to fix the rotational position of a rotated sub-packet in the stator laminated core and in particular to firmly join two adjacent sub-packets. Such a firm join between adjacent sub-packets is simpler and more cost-effective to produce than welding the sub-packets of the stator laminated core.For the purposes of the invention, an axial hole is understood to mean any recess that has an axial extension in the stator laminated core.

[0010] In this way, at least an anti-twist device, and in particular an additional solid joint connection, is formed between adjacent sub-packages.

[0011] The measures listed in the subclaims enable advantageous further developments and improvements of the stator of an electrical machine specified in the main claim.

[0012] It is particularly advantageous if the twisted sub-packages of the stator laminated core are secured against rotation and / or fastened to an adjacent twisted or an adjacent untwisted sub-package by means of plastically formed hole edges.

[0013] It is further advantageous if the protruding hole edges are each formed by a reduced-size lamella hole, which has a reduced hole contour compared to other lamella holes of the same axial hole, which is in particular reduced in size over its entire circumference or in part, and / or in particular has at least one hole edge projection, in particular a tooth, a tab, or a shoulder. In this way, reliable anti-rotation devices and / or reliable axial joints can be produced.

[0014] It is also advantageous if the hole edges of the lamination holes each have at least one hole edge recess along their hole circumference, in particular a plurality of hole edge recesses, wherein a reduced lamination hole is formed by a tab in a hole edge recess. When the tab of the hole edge recess is plastically deformed into a hole edge recess of an adjacent sub-package, an anti-twist lock is created by positive locking. In this way, an anti-twist lock can be achieved with just a single axial hole according to the invention. Furthermore, the plastically deformed hole edges are arranged in recesses and thus advantageously do not impede the passage of the fastening screws. Furthermore, the hole edge recesses can serve as a channel for supplying cooling fluid into the stator slots of the stator laminated core.It is very advantageous if the protruding hole edges of the respective sub-package are formed on at least one end lamella of the sub-package. In this way, the axial extension of the formed protruding hole edges can be kept as short as possible.

[0015] It is also advantageous if the axial holes of the subpackages are each formed on a periphery of the respective subpackage facing away from the stator slots. In this way, the axial holes can be used not only to prevent rotation and / or axially join the subpackages, but also to attach the stator to a housing. In this case, the axial holes would also serve as mounting holes for the insertion of fastening screws.

[0016] The axial holes of the sub-packages can be closed or open along the respective hole circumference. With an axial hole that is closed along the hole circumference, the axial hole is completely surrounded by sheet metal. With an axial hole that is open along the hole circumference, the axial hole can only be partially surrounded by sheet metal. An open axial hole can therefore be designed, for example, as a groove or profile groove or as a half-hole comprising a semi-cylindrical recess. The cross-section of the axial holes can have any shape and is expressly not limited to a round shape. To form the closed or open axial holes, the slat holes of the slats are also designed to be closed or open.

[0017] The axial holes of the sub-packages are advantageously through-holes that run continuously through the respective sub-package.

[0018] It is also advantageous if, after rotating the sub-packages, the axial holes of each sub-package are aligned with several axial holes of the remaining sub-packages. This creates stack holes in the stator core, into which fastening screws can be inserted to attach the stator to a housing.

[0019] According to an advantageous embodiment, it is provided that in at least one core hole, in particular in several or all core holes, each sub-core is secured against rotation and / or fastened to an adjacent sub-core by a plastically formed hole edge. It is also advantageous if at least two twist groups of twisted sub-cores are provided in the stator core, each twist group comprising at least two, in particular three, twisted sub-cores.

[0020] By twisting the sub-packets, several support points are formed in the stator slots, spaced apart axially relative to the stator axis, for clamping the conductor bundle located in the respective stator slot. Between the twisting groups or support points, the conductor bundles of the stator winding are suspended freely, i.e., without contact with the stator core, creating sufficiently large slot gap channels in the stator slots for the flow of a cooling medium, particularly oil. This can significantly improve stator cooling.

[0021] Furthermore, it is advantageous if at least one of the axial holes in the stator laminated core is designed to generate a predetermined rotation of the sub-packets by inserting a pin-shaped or sleeve-shaped alignment element into the axial hole of the stator laminated core, and in particular, has no protruding hole edges. This makes it easy to achieve and ensure a predefined rotation of the sub-packets in the stator laminated core. The resulting rotational position of the rotated sub-packets is then fixed by the rotational position lock according to the invention.

[0022] In addition, the invention relates to a method for producing a stator according to the invention, comprising the steps of: a. producing sub-packets, each comprising a stack of firmly connected, in particular glued or punched, laminations and each having a plurality of axial holes formed by corresponding lamination holes in the laminations, b. stacking the sub-packets to form a stator laminated core, c. inserting or introducing the stator winding into the stator slots, d. rotating at least two sub-packets relative to other sub-packets for locally clamping conductor bundles in the stator slots, e. inserting a forming tool into at least one of the axial holes of the stator laminated core and forming hole edge projections formed in the respective axial hole for fixing the rotational position of the rotated sub-packets.

[0023] Advantageously, step d) may comprise the following step(s): - inserting at least one alignment element into one of the axial holes, whereby first sub-packets and second sub-packets are rotated in opposite directions about the stator axis,

[0024] - In particular, pulling out the at least one alignment element from the at least one axial hole.

[0025] drawing

[0026] An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.

[0027] They show:

[0028] Fig.1 shows a part of a stator of an electrical machine with axial holes according to the invention,

[0029] Fig.2 is a partial view of a section along the line ll-ll in Fig.1 through two stator slots of the stator,

[0030] Fig.3 the partial packages of a twisting group of the stator according to Fig.1 and Fig.2 in the twisted state,

[0031] Fig.4A shows in section an axial hole according to the invention of the stator according to Fig.1 and Fig.3 before twisting the partial packages of the twisting group,

[0032] Fig.4B shows the axial hole in section according to Fig.4A after twisting the sub-packages of the twisting group,

[0033] Fig.4C shows in section the axial hole according to Fig.4B during the plastic forming of protruding hole edges,

[0034] Fig.4D shows in section the axial hole according to Fig.4B and Fig.4C after the plastic forming of the protruding hole edges,

[0035] Fig.5A shows a first variant of a hole contour of a reduced lamella hole for forming one of the axial holes according to the invention,

[0036] Fig.5B shows a second variant of a hole contour of a reduced lamella hole for forming one of the axial holes according to the invention,

[0037] Fig.5C shows a third variant of a hole contour of a reduced lamella hole for forming one of the axial holes according to the invention,

[0038] Fig.5D shows a fourth variant of a hole contour of a reduced lamella hole for forming one of the axial holes according to the invention,

[0039] Fig.5E shows a fifth variant of a hole contour of a reduced lamella hole for forming one of the axial holes according to the invention, Fig.5F shows a sixth variant of a hole contour of a reduced lamella hole for forming an open axial hole,

[0040] Fig.6A a first lamella for forming a first sub-package of a twisting group according to Fig.2 and Fig.3,

[0041] Fig.6B a second lamella for forming a second sub-package of a twisting group according to Fig.2 and Fig.3,

[0042] Fig.6C a third lamella for forming a third sub-package according to Fig.2 and

[0043] Fig.7 shows a variant of the stator according to Fig.1, in which the partial packages of a

[0044] The twisting group can be twisted by inserting an alignment element into one of the axial holes of the stator.

[0045] Description of the embodiment

[0046] Fig.1 shows a part of a stator of an electrical machine with axial holes according to the invention.

[0047] The stator 1 of an electrical machine 2 according to the invention has a stator core 3 comprising a stack of laminations 14 and a stator winding 4 extending through stator slots 5 of the stator core 3. A conductor bundle 6 of conductor legs 7 of the stator winding 4 is arranged in each of the stator slots 5. The stator 1 extends in the circumferential direction around a stator axis 10. The stator slots 5 are each formed between stator teeth 9. The stator teeth 9 are each formed by lamination teeth 8 of the laminations 14.

[0048] Fig.2 a partial view of a section along the line ll-ll in Fig.1 through two stator slots of the stator

[0049] The stator laminated core 3 comprises several sub-cores 13. The sub-cores 13 are each formed by a stack of firmly connected, in particular glued or stamped, laminations 14. The laminations 14 are sheet metal laminations, in particular made of electrical steel.

[0050] At least two of the sub-packets 13 are rotated relative to one another about the stator axis 10 for the local clamping of conductor bundles 6 of the stator winding 4 located in the stator slots 5. According to Fig. 2, at least two twisting groups 23 of twisted sub-packets 13 are provided in the stator laminated core 3. Each twisting group 23 comprises at least two, in particular three, twisted sub-packets 13. The sub-packets 13 of the respective twisting group 23 are adjacent to one another, for example. According to the embodiment in Fig. 2, for example, three sub-packets 13 per twisting group 23 are rotated in opposite directions by a twist angle t|) about the stator axis 10.

[0051] By rotating sub-packets 13 of the rotating groups 23, a plurality of support points 11 are formed in the stator slots 5, spaced apart from one another in the axial direction relative to the stator axis 10, for clamping the conductor bundle 6 located in the respective stator slot 5. Between the rotating groups 23 or support points 11, the conductor bundles 6 of the stator winding 4 are mounted in a freely suspended manner, i.e., without contact with the stator laminated core 3, thereby creating sufficiently large slot gap channels 19 in the stator slots 5 for the flow of a cooling medium, in particular oil.

[0052] The conductor bundle 6 of the respective stator slot 5 is enclosed by an electrically insulating slot insulation 12 at least in the area of ​​the respective twisting group 23.

[0053] A twisting group 23 comprises at least a first sub-package 13.1, in particular two first sub-packages 13.1, made of first lamellae 14.1 and a second sub-package 13.2 made of second lamellae 14.2. According to Fig. 2, the second sub-package 13.2 is arranged, for example, between two first sub-packages 13.1.

[0054] The sub-packages that are not part of a twisting group 23 form third sub-packages 13.3 from third lamellas 14.3.

[0055] Fig.3 shows the partial packages 13 of such a twisting group 23 of the stator according to Fig.1 and Fig.2 in the twisted state, with the conductor bundles of the stator winding hidden.

[0056] According to Fig. 1 and Fig. 3, the sub-packages 13 each have a plurality of axial holes 15 arranged along their circumferential direction, which are formed by corresponding lamella holes 16 in the lamellae 14. The axial holes 15 of the sub-packages 13 can be closed or open along the respective hole circumference. Furthermore, the axial holes 15 of the sub-packages 13 can be through-holes that run continuously through the respective sub-package 13.

[0057] The lamella holes 16 each have a hole edge 17. The axial holes 15 of the sub-packages 13 are each formed on a circumference of the respective sub-package 13 facing away from the stator slots 5.

[0058] Fig.4A shows in section an axial hole according to the invention of the stator according to Fig.1 and Fig.3 before the partial packages of the twisting group are twisted.

[0059] Fig.4B shows a section of the axial hole according to Fig.4A after twisting the sub-packages of the twisting group.

[0060] According to the invention, at least one axial hole 15a of at least one sub-package 13 of the stator laminated core 3 has, according to Fig.4B, at least one hole edge 17k of a lamination hole 16 projecting into the respective axial hole 15. For example, several or all axial holes 15a of each sub-package 13 each have at least one hole edge 17k projecting into the respective axial hole 15a.

[0061] According to the invention, at least one protruding hole edge 17k of at least one sub-packet 13 is plastically deformed, in particular bent, into an axial hole 15 of a respective adjacent sub-packet 13 in order to fix the rotational position of a rotated sub-packet 13 in the stator laminated core 3 and in particular to firmly join two adjacent sub-packets 13. In this way, at least one anti-twist device is formed for the rotated sub-packets 13. In addition to the anti-twist device, the hole edges 17k plastically deformed into axial holes 15 can firmly connect adjacent sub-packets 13 to one another in the axial direction with respect to the stator axis 10 and in this way form an axial joint connection.

[0062] The protruding hole edges 17k of the respective sub-package 13 are formed, for example, on at least one end lamella of the sub-package 13, as shown in Fig. 4B-Fig. 4D. The end lamellas with protruding hole edges 17 are special lamellas of the respective sub-package 13 and differ, for example, only in the reduced lamella holes 16s. According to Fig. 4D, the twisted sub-packages 13 of a twisting group 23 are each secured against rotation and / or attached to an adjacent twisted or an adjacent untwisted sub-package 13 by means of plastically deformed hole edges 17k.

[0063] The projecting hole edges 17k are each formed by a reduced lamella hole 16s, which has a reduced hole contour compared to other lamella holes 16 of the same axial hole 15

[0064] For example, the area of ​​an axial hole 15 into which a protruding hole edge 17k is deformed has no reduced-size lamella holes 16s.

[0065] Fig.5A to Fig.5F show six possible variants of a hole contour of a reduced lamella hole 16s of a lamella 14 for forming one of the axial holes 15 according to the invention.

[0066] A protruding hole edge 17k can be formed protruding over its entire circumference according to Fig. 5A or partially protruding over its entire circumference according to Figs. 5B-5F. Accordingly, the reduced hole contour of a reduced lamella hole 16s can be reduced over its entire circumference or partially. Furthermore, the reduced hole contour of a reduced lamella hole 16s can have a deformed structure, in particular at least one hole edge projection 18, which is in particular a tooth, a tab, or a partially annular shoulder.

[0067] The unreduced lamella holes 16, which do not have a protruding hole edge 17k, have, for example, a hole contour that results from omitting the forming structure of a reduced hole contour of a reduced lamella hole 16. The unreduced lamella holes 16, which belong to the variants in Fig. 5A to Fig. 5D, therefore have, for example, a round hole contour.

[0068] Fig. 5E and Fig. 5F show a fifth and sixth variant of a reduced-size hole contour, which has at least one, for example, several, hole edge recess(es) 17n along a, for example, round hole circumference. To form a reduced-size lamella hole 16s, a forming structure, for example, a particularly rectangular tab, can be formed in at least one hole edge recess 17n, according to Fig. 5E, for example, in two of four hole edge recesses 17n, which is intended for plastic deformation into a hole edge recess 17n of an unreduced lamella hole 16 without a forming structure, i.e., without a tab.

[0069] The hole edges 17 of the unreduced slat holes 16, which belong to the variants according to Fig.5E and Fig.5F, each have, for example, along their hole circumference at least one hole edge recess 17n, in particular several, for example four, hole edge recesses 17n.

[0070] The fifth variant according to Fig.5E shows a closed lamella hole 16s for forming a closed axial hole 15 and the fifth variant according to Fig.5F shows an open lamella hole 16s for forming an open and groove-shaped axial hole 15.

[0071] The following steps are provided for the production of the stator 1 according to the invention:

[0072] In a first step, the partial packages 13 are produced, each comprising a stack of firmly connected, in particular glued or punched, laminations 14 and each having a plurality of axial holes 15 formed by corresponding lamination holes 16 in the laminations 14. In a subsequent second step, the partial packages 13 are stacked to form a stator laminated core 3. The stacking is carried out, for example, in such a way that essentially aligned slot flanks result in each stator slot 5, whereby the conductor bundles 6 can be inserted into the stator slots 5 with joining air. In this arrangement, the axial holes 15 of the partial packages 13 are arranged non-aligned with the axial holes 15 of the other partial packages 13 according to Fig. 4A. In a subsequent third step, the stator winding 4 is inserted into the stator slots 5. According to Fig. 4A and Fig.4B, in a subsequent fourth step, at least two subpackages 13 are rotated relative to other subpackages 13 for locally clamping conductor bundles 6 in the stator slots 5. After the subpackages 13 of the twisting groups 23 have been rotated, the conductor bundles 6 are locally clamped in the stator slots 5 as shown in Fig.2.

[0073] Furthermore, according to Fig. 4B, after the rotation of the sub-packets 13 of the rotation groups 23, the axial holes 15 of the sub-packets 13 of the stator laminated core 3 are arranged in alignment such that the stator laminated core 3, viewed in the circumferential direction, has a plurality of aligned core holes 30 with aligned hole edges 17. In at least one core hole 30, in particular in several or all core holes 30, each sub-packet 13 is secured against rotation and / or fastened to an adjacent sub-packet 13 by a plastically deformed hole edge 17k.

[0074] According to Fig.4C and Fig.4D, in a subsequent fifth step, a forming tool 21 is inserted into at least one of the axial holes 15 of the stator laminated core 3 in the axial direction, whereby a forming of hole edge projections 18 formed in the respective axial hole 15 for fixing the rotational position of the rotated partial cores 13 is achieved.

[0075] The twisting of the sub-packages 13 of the twisting groups 23 can be achieved in the fourth step by tools gripping the sub-packages 13 at their circumference.

[0076] Alternatively, according to Fig. 7, the rotation of the sub-packets 13 of the rotation groups 23 can be carried out in the fourth step by axially inserting at least one pin-shaped or sleeve-shaped alignment element 20 into one 15b of the axial holes 15 of the stator 1, whereby first sub-packets 13.1 and second sub-packets 13.2 are rotated in opposite directions about the stator axis 10. The respective axial hole 15b of the stator laminated core 3 is designed and arranged to generate the predetermined rotation of the sub-packets 13 upon axial insertion of the alignment element 20. Such an axial hole 15b has, in particular, no protruding hole edges 17k. The at least one alignment element 20 can then be pulled out again from the at least one axial hole 15b.

[0077] The three lamination types 14.1, 14.2, 14.3 of the stator laminated core are shown in Fig.6A, Fig.6B and Fig.6C, each in a linear development to simplify the illustration.

[0078] The lamella holes 16 of the first lamellae 14.1 for forming the first partial packages 13.1 are aligned in the circumferential direction according to Fig.6A in each case relative to the tooth pole center 8m of the nearest lamella tooth 8 in a first relative orientation, in particular offset by an offset angle a.

[0079] The lamella holes 16 of the second lamellae 14.2 for forming the second partial packages 13.2 are aligned in the circumferential direction relative to the tooth pole center 8m of the nearest lamella tooth 8 in a second relative orientation according to Fig.6B, in particular offset by an offset angle a, wherein the first and second

[0080] Relative orientation in the circumferential direction is opposite and in particular the same in terms of magnitude.

[0081] The first and second laminations 14.1, 14.2 are, for example, of identical shape and are arranged in the stator laminated core 3, for example, laterally reversed to one another.

[0082] The lamella holes 16 of the third lamellae 14.3 are aligned in the circumferential direction relative to a tooth pole center 8m of the nearest lamella tooth 8 in a third relative orientation, in particular centered to the tooth pole center 8m.

Claims

Claims 1. Stator of an electrical machine (2) with a stator laminated core (3) and a stator winding (4) which runs through stator slots (5) of the stator laminated core (3), wherein the stator laminated core (3) comprises a plurality of sub-packages (13), wherein the sub-packages (13) each comprise a stack of laminations (14) which are firmly connected to one another, in particular glued or punched together, wherein at least two of the sub-packages (13) are rotated relative to one another about a stator axis (10) for the local clamping of conductor bundles (6) of the stator winding (4) lying in the stator slots (5), characterized in that - the sub-packets (13) each have a plurality of axial holes (15) arranged along the circumferential direction and extending in the axial direction, which are formed by lamella holes (16) in the lamellae (14), wherein the lamella holes (16) each have a hole edge (17), - at least one axial hole (15) of at least one sub-package (13) has at least one hole edge (17k) of a lamella hole (16) projecting into the respective axial hole (15), - at least one projecting hole edge (17k) of at least one partial package (13) is plastically deformed, in particular bent, into an axial hole (15) of a respective adjacent partial package (13), for fixing the rotational position of a rotated partial package (13) in the stator laminated core (3) and in particular for firmly joining two adjacent partial packages (13).

2. Stator according to claim 1, characterized in that the twisted partial packages (13) are each secured against rotation and / or fastened to an adjacent twisted or an adjacent untwisted partial package (13) by means of plastically deformed hole edges (17k).

3. Stator according to one of the preceding claims, characterized in that the projecting hole edges (17k) are each formed by a reduced-size laminar hole (16s) which, compared to other laminar holes (16) of the same axial hole (15), has a reduced-size hole contour, which is in particular reduced over its entire circumference or partially over its circumference and / or in particular has at least one hole edge projection (18), in particular a tooth, a tab or a shoulder.

4. Stator according to claim 3, characterized in that the hole edges (17) of the lamination holes (16) each have along their hole circumference at least one hole edge recess (17n), in particular several hole edge recesses (17n), wherein a reduced lamella hole (16s) is formed by a tab (18) in a hole edge recess (17n).

5. Stator according to one of the preceding claims, characterized in that the projecting hole edges (17k) of the respective sub-package (13) are formed on at least one end lamination of the sub-package (13).

6. Stator according to one of the preceding claims, characterized in that the axial holes (15) of the partial packages (13) are each formed on a circumference of the respective partial package (13) facing away from the stator slots (5).

7. Stator according to one of the preceding claims, characterized in that the axial holes (15) of the partial packages (13) are closed or open along the respective hole circumference.

8. Stator according to one of the preceding claims, characterized in that the axial holes (15) of the partial packages (13) are through holes which run continuously through the respective partial package (13).

9. Stator according to one of the preceding claims, characterized in that the axial holes (15) of each sub-package (13) are arranged in alignment with a plurality of axial holes (15) of the remaining sub-packages (13) after the rotation of sub-packages (13).

10. Stator according to one of the preceding claims, characterized in that aligned axial holes (15) of the partial packages (13) each form a package hole (30), wherein in at least one package hole (30), in particular in several or all package holes (30), each partial package (13) is secured against rotation and / or fastened to an adjacent partial package (13) by a plastically deformed hole edge (17k). 11 . Stator according to one of the preceding claims, characterized in that in the stator laminated core (3) at least two twisting groups (23) of twisted Partial packages (13) are provided, wherein each twisting group (23) comprises at least two, in particular three, twisted partial packages (13).

12. Stator according to one of the preceding claims, characterized in that at least one of the axial holes (15b) of the stator laminated core (3) is designed to produce a predetermined rotation of the sub-packets (13) by inserting a pin-shaped or sleeve-shaped alignment element (20) into the axial hole (15b) of the stator laminated core (3) and in particular has no protruding hole edges (17k).

13. A method for producing a stator according to one of claims 1 to 12, comprising the steps: a. producing sub-packets (13), each comprising a stack of firmly connected, in particular glued or punched, laminations (14) and each having a plurality of axial holes (15) formed by corresponding lamination holes (16) in the laminations (14), b. stacking the sub-packets (13) to form a stator laminated core (3), c. inserting the stator winding (4) into the stator slots (5), d. rotating at least two sub-packets (13) relative to other sub-packets (13) for locally clamping conductor bundles (6) in the stator slots (5), e. introducing a forming tool (21) into at least one of the axial holes (15a) of the stator laminated core (3) and forming hole edge projections (18) formed in the respective axial hole (15) for fixing the rotational position of the rotated partial cores (13).

14. The method according to claim 13, characterized in that step d) comprises the following step(s): - inserting at least one alignment element (20) into one (15b) of the axial holes (15), whereby first sub-packets (13.1) and second sub-packets (13.2) are rotated in opposite directions about the stator axis (10), - In particular, pulling out the at least one alignment element (20) from the at least one axial hole (15b).

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