Method and device for producing a stator, winding template and electric machine for driving a vehicle

Abstract

Method for producing a stator (102) for an electrical machine (101), the method comprising the following steps: a) providing a stator core (55) having a plurality of slots (61) open to the inner lateral surface (60) and tapering from a slot base (62) to the lateral surface (60); b) producing a winding (2) by winding a wire arrangement (10) around a winding template (1) which has two guide surfaces (6, 7) spaced apart along a transverse axis (8), such that the winding (2) forms a winding interior (11) and that the winding (2) extends along a longitudinal axis (9) from a first to a last individual turn (11a), wherein the guide surfaces (6, 7) each have an apex line (12, 13); c) arranging the winding (2) on a drawing-in tool (56) by releasing the winding (2) from the winding template (1) in such a way that the drawing-in tool (56) penetrates the interior of the winding (11); and d) drawing the winding (2) into two of the slots (61) by performing a relative movement of the drawing-in tool (56) with respect to the stator core (55), wherein those sections of the winding (2) which rest on the guide surfaces (6, 7) in the wound position are arranged in a drawn-in position on end faces (58, 59) of the stator core (55).

Description

The present invention relates to methods for manufacturing a stator for an electric machine. In addition, the invention relates to a winding former, to a device for producing a stator for an electric machine and to an electric machine for driving a vehicle.For winding a stator with a winding of a parallel wire arrangement, it is generally known to initially wind the winding onto a winding template and then to draw the winding into the stator core by means of a draw-in mechanism. An exemplary method is known from DE 10 2007 038 429 A1.In particular, if the stator core has slots which taper from the slot base to the slot opening, as is disclosed, for example, in DE 10 2018 104 113 A1, it is often only possible to achieve a modest winding quality with conventional winding templates, which leads to undesired compensation currents due to the skin effect during operation of a corresponding electric machine.The object of the invention is to specify a possibility for achieving an improved-wound stator core for an electric machine.This object is achieved according to the invention by a method for producing a stator for an electric machine, wherein the method has the following steps: a) providing a stator core which has two end faces which are axially opposite with respect to a stator longitudinal axis, a radially inner lateral surface and a multiplicity of slots which are open to the inner lateral surface and taper from a slot base to the lateral surface; b) producing a winding comprising a plurality of single windings by winding a wire arrangement around a winding template which has two guide surfaces spaced apart along a transverse axis orthogonal to a longitudinal axis in such a way that the winding forms a winding interior which surrounds the longitudinal axis in a position wound on the winding template and that the winding extends along the longitudinal axis from a first of the single windings to a last of the single windings, wherein the guide surfaces each have an apex line which comprises those points of the guide surfaces which are situated between the first of the single windings and the last of the single windings and which are at the widest distance from one another with respect to the transverse axis on a respective one of the planes perpendicular to the longitudinal axis, wherein a distance of the apex lines decreases along the longitudinal axis from the first of the single windings towards the last of the single windings; c) arranging the winding on a draw-in tool by detaching the winding from the winding template in such a way that the draw-in tool passes through the interior of the winding; and d) drawing the winding into at least two of the slots by carrying out a relative movement of the draw-in tool with respect to the stator core, wherein those sections of the winding which in the wound position bear on the guide surfaces are arranged in a drawn-in position on the end faces of the stator core and the first of the individual windings is arranged further radially outwards than the last of the individual windings in the slots.The method according to the invention comprises a step a) of providing a stator core. The stator core has two end faces. The end faces lie axially opposite one another with respect to a stator longitudinal axis. The stator core further has a radially inner circumferential surface. The stator core further includes a plurality of slots. The grooves are open to the inner lateral surface. The grooves taper from a groove base to the lateral surface.The method according to the invention comprises a step b) of producing a winding by winding a wire arrangement around a winding template. The winding comprises a plurality of individual windings. The winding template has two guide surfaces. The guide surfaces are spaced along the transverse axis. The transverse axis is orthogonal to a longitudinal axis. The winding takes place in such a way that the winding forms a winding interior and that the winding extends along the longitudinal axis from a first of the individual windings to a last of the individual windings. The winding interior surrounds the longitudinal axis in a position wound on the winding template.The guide surfaces each have an apex line. The apex line comprises those points located between the first of the individual windings and the last of the individual windings which are at the widest distance from one another with respect to the transverse axis on a respective one of the planes perpendicular to the longitudinal axis. A distance of the apex lines decreases along the longitudinal axis from the first of the individual windings toward the last of the individual windings.The method according to the invention further comprises a step c) of arranging the winding on a draw-in tool. The arrangement takes place by detaching the winding from the winding template in such a way that the draw-in tool passes through the winding interior.The method according to the invention further comprises a step d) of drawing the winding into at least two of the slots. The drawing-in takes place by carrying out a relative movement of the drawing-in tool with respect to the stator core. In this case, those sections of the winding which in the wound position bear on the guide surfaces are arranged in a retracted position on the end faces of the stator core and the first of the individual windings is arranged further radially outwards than the last of the individual windings in the slots.The invention proposes using a winding template in which the distance of the apex lines of the guide surfaces decreases from the first of the individual windings, i.e. an individual winding close to the base of the groove in the retracted position, to the last of the individual windings, i.e. an individual winding remote from the base of the groove in the retracted position. In this way, the winding is given a conical shape and fits better into the slots tapering towards the slot opening.As a result, individual wires of the wire arrangement can get more precisely into their intended place in the groove when being drawn in, as a result of which the occurrence of undesired compensation currents during operation of an electric machine with a stator produced in this way can be reduced on account of the skin effect. The electric machine can then be operated with a higher performance.The stator core is preferably formed from a multiplicity of individual sheets arranged in a layered manner along the stator longitudinal axis and / or electrically insulated from one another. The stator core can thus also be referred to as a stator laminated core.In step d), the relative movement can be effected by moving the retraction tool to the stator core and / or moving the stator core to the retraction tool.An imaginary line from the first location, at which the first of the individual windings rests on the apex line, to a second location, at which the last of the individual windings rests on the apex line, preferably encloses an angle between 1 and 10 degrees, preferably between 2.5 and 6 degrees, with a straight line which runs parallel to the longitudinal axis through the first location.In a preferred embodiment of the method according to the invention, a distance of both apex lines to the longitudinal axis decreases from the first of the individual windings to the last of the individual windings. In particular, the distance decreases continuously or strictly monotonically. In other words, this means that the apex line does not run parallel to the longitudinal axis at any point. In detail, the distance may decrease linearly.The wire arrangement is preferably a wire bundle of a plurality of parallel individual wires. The individual wires can be provided with an electrically insulating lacquer layer. The individual wires have in particular a round cross section. A cross-sectional area of a respective single wire can be between 0.5 and 1.3 mm 2, preferably between 0.7 and 1.0 mm 2. Overall, between 100 and 250 individual wires, preferably between 140 and 170 individual wires, can be arranged in a respective groove through all individual windings.In a particularly preferred embodiment, it is provided that in step b), after the formation of a part of the individual turns comprising the first of the individual turns on one of the guide surfaces, a 180-degree rotation about a longitudinal axis of the wire arrangement is formed and then the further individual turns are formed up to the last of the individual turns. In the case of such a winding, as is also described in detail in DE 10 2018 104 113 A1, for example, the advantages of the method according to the invention are particularly evident because the drawing-in of such a winding requires a particularly precise arrangement of the individual wires in the slots. It can of course also be provided that after the 180-degree rotation one or more further 180-degree rotations are formed up to the last of the individual windings.In the method according to the invention, provision can be made in step b) for the wire arrangement to be fed in a straight line by means of a feed device and for a relative movement to be carried out between the feed device and the winding former along the longitudinal axis.The feeder may rotate about the longitudinal axis. Alternatively, the winding template rotates about the longitudinal axis.In addition, it can be provided that, in order to carry out the relative movement between the feed device and the winding template, the feed device or the winding template is moved linearly along the longitudinal axis.In the method according to the invention, it is preferably provided that the guide surfaces are each formed by a guide jaw of the winding template, wherein in the wound position the winding is freely tensioned between the guide jaws. In particular, in step c) the winding can be released from the winding template by moving the guide jaws towards each other. The winding template can have a merging device configured for this purpose.Each guide jaw may have a first surface section on which the guide surfaces are formed. The first surface section can be inclined and / or straight by the angle to the longitudinal axis.Each guide jaw may further comprise second and third surface portions. The second and the third surface section can lie in respective planes which are parallel to a plane spanned by the transverse axis and the longitudinal axis.Each guide jaw may further comprise fourth and fifth surface portions on which the guide surfaces are formed and which connect the first surface portion to the second and third surface portions. The fourth and fifth surface sections can be inclined at the angle to the longitudinal axis. The surface sections of fourth and fifth surface sections can transition, rounded from the first surface section, into the second and third surface sections.Preferably, the stator comprises a plurality of strands and a plurality of pole pairs, wherein steps b) and c) for forming one of the strands are carried out a plurality of times each for one pole pair and in step d) the windings produced for the pole pairs of the strand are drawn into different slots. Steps b) through d) may be performed for each of the strings in sequence.The object on which the invention is based is furthermore achieved by a winding template for producing a winding comprising a plurality of individual windings, wherein the winding template has two guide surfaces which are spaced apart along a transverse axis orthogonal to a longitudinal axis and which can be wound around by a wire arrangement in such a way that the winding forms a winding interior which surrounds the longitudinal axis in a position wound on the winding template and that the winding extends along the longitudinal axis from a first of the individual windings to a last of the individual windings, wherein the guide surfaces are configured in such a way that those points of the guide surfaces which in a respective one of the planes perpendicular to the longitudinal axis are at the widest distance from one another with respect to the transverse axis are located on an apex line of a respective one of the guide surfaces and a distance of the apex lines along the longitudinal axis decreases from the first of the individual windings towards the last of the individual windings.The guide surfaces can each be formed by a guide jaw of the winding template, so that the winding is freely tensioned between the guide jaws in the wound position.Furthermore, the guide jaws can be arranged such that they can be moved towards each other, so that the winding can be detached from the winding template.The object on which the invention is based is furthermore achieved by a device for producing a stator for an electric machine, comprising a winding template according to the invention; a feed device which is configured to feed the wire arrangement; a first movement device which is configured to rotate the feed device or the winding template about the longitudinal axis; a second movement device which is configured to carry out a relative movement between the feed device and the winding template along the longitudinal axis; a device for providing a stator core which has two end faces which are axially opposite with respect to a stator longitudinal axis, a radially inner lateral surface and a multiplicity of slots which are open to the inner lateral surface; a draw-in tool configured to pass through the winding interior when the winding is released from the winding template and draw the winding into two of the slots by performing a relative movement of the draw-in tool with respect to the stator core, and to arrange portions of the winding that in the wound position rest on the guide surfaces in a drawn-in position at the end sides of the stator core and to arrange the first single winding further radially outward than the last single winding in the slots.All embodiments of the method according to the invention can be transferred analogously to the winding stencil according to the invention, the device according to the invention and the electrical machine according to the invention, so that the advantages described above can also be achieved with these.Further advantages and details of the present invention will become apparent from the drawings described below. These are schematic representations and show: FIG. 1 is a side view of an embodiment of the inventive coil former and a coil in a position wound on the coil former; FIG. 2 shows a perspective detailed view of a guide jaw of the exemplary embodiment shown in FIG. 1 ; FIG. 3 is a block diagram of an embodiment of the apparatus according to the invention; FIG. 4 shows a flow chart of an exemplary embodiment of the method according to the invention; and FIG. 5 shows a schematic diagram of an exemplary embodiment of the electric machine according to the invention for driving a vehicle.FIGS. 1 and 2 show an exemplary embodiment of a winding template 1, wherein FIG. 1 is a side view of the winding template 1 and of a winding 2 in a position wound onto the winding template 1 and FIG. 2 is a perspective detailed view of a guide jaw 3.In the present exemplary embodiment, the winding template 1 is exemplarily formed with two guide jaws 3, 4 and a merging device 5, which-like the winding 2-is only shown purely schematically in FIG. 1.The winding template 1 has guide surfaces 6, 7, which are spaced apart along a transverse axis 8 and illustrated by hatching. The transverse axis 8 is orthogonal to a longitudinal axis 9 likewise shown in FIG. 1 The guide surfaces 6, 7 can be wound around by a wire arrangement 10 to form individual windings 11 ato 11 ein such a way that the winding 2 forms a winding interior 11 which surrounds the longitudinal axis 9 in the position wound on the winding template 1 and that the winding 2 extends along the longitudinal axis 9 from a first of the individual windings 11 ato a last of the individual windings 11 e.The guide surfaces 6, 7 are configured such that those points of the guide surfaces 6, 7 which are at the widest distance from one another in a respective one of the planes perpendicular to the longitudinal axis 9 with respect to the transverse axis 8 are located on an apex line 12, 13 of a respective one of the guide surfaces 6, 7 and a distance of the apex lines 12, 13 decreases along the longitudinal axis 9 from the first 11 aof the individual windings towards the last of the individual windings 11 e.In the present exemplary embodiment, the apex lines 12, 13 are straight, so that the distance decreases linearly. Each apex line makes an angle 15 with a straight line 14 parallel to the longitudinal axis 9 between 1 and 10 degrees, preferably between 2.5 and 6 degrees. In the present exemplary embodiment, the angle 15 is, for example, 5 degrees.In the wound position shown in FIG. 1, the winding 2 is freely tensioned between the guide jaws 3, 4. From the wound position, the guide jaws 3, 4 can be moved towards each other by means of the joining device 5, so that the winding 2 can be detached from the winding template 1.As a particular detail of the winding template 1, it is provided that each guide jaw 3, 4 has five surface sections, of which only the surface sections 16 b, 16 cof the guide jaw 3 and the surface sections 16 d, 16 eof the guide jaw 4 are completely visible in FIG. 1, and of which the surface sections 16 a, 16 b, 16 care completely visible in FIG. 2. The guide surfaces 6, 7 are formed on the surface sections 16 ato 16 eThe surface section 16a is inclined and straight at the angle 15 to the longitudinal axis 9. The surface sections 16 c, 16 eare spaced apart from one another in respective planes which are parallel to a plane spanned by the transverse axis 8 and the longitudinal axis 9. The surface sections 16 b, 16 dconnect the surface section 16 ato the surface sections 16 c, 16 eand are likewise inclined by the angle 15 to the longitudinal axis 9. As can be seen best in FIG. 2, the surface sections 16 c, 16 eare rounded and can transition from the surface section 16 ato the surface sections 16 c, 16 e.FIG. 3 is a block diagram of an embodiment of an apparatus 50 for manufacturing a stator 102 (see FIG. 5 ).The apparatus 50 includes a coil former 1 according to the above-described embodiment, a feeding device 51, a first moving device 52, a second moving device 53, a device 54 for providing a stator core 55, and a feeding tool 56. The device 50 is configured to carry out a method for producing the stator 102 and is explained below with reference to an exemplary embodiment of this method: FIG. 4 is a flow chart of the embodiment of the method.The method comprises a step a) of providing the stator core 55, through which the device 54 is configured.The stator core has two end faces 58, 59 axially opposite with respect to a stator longitudinal axis 57, a radially inner lateral surface 60 and a multiplicity of slots 61 which are open to the inner lateral surface 60, one of which slots is illustrated in detail in FIG. 3. The grooves 61 taper from a groove base 62 toward the lateral surface 60 and can therefore also be understood as V-shaped grooves 61.The method further comprises a step b) of generating the winding 2. This is effected by winding the wire arrangement 10, which is a wire bundle of a plurality of parallel individual wires 63, around the winding template 1 in such a way that the winding 2 forms the winding interior 11 which surrounds the longitudinal axis 9 in the wound position, and that the winding 2 extends along the longitudinal axis 9 from the first of the individual windings 11 ato the last of the individual windings 11 e. The individual windings 11 ato 11 ecover the guide surfaces 6, 7 of the winding template 1 (see FIG. 1 ).During winding, the feeding device 51 that feeds the wire assembly 10 is rotated around the winding jig by the first moving device 53. At the same time, the second movement device 54 moves the feeding device along the longitudinal axis 9, so that the wire arrangement from the first of the single windings 11 ato the last of the single windings 11 ealong the apex lines 12, 13 covers the winding template 1 (see FIG. 1 ). In this case, in particular, there is no overlying of the individual windings 11 ato 11 ewith one another.In an optional embodiment of the method, it can also be provided in step b) that after the formation of a part of the individual windings comprising the first of the individual windings 11 aand optionally also the formation of further parts on one of the guide surfaces 6, 7, a 180-degree rotation about a longitudinal axis of the wire arrangement 10 is formed in each case and then the further individual windings are formed up to the last of the individual windings 11 e. For performing the 180-degree rotation or rotations, the first movement device 52 can be configured.In a subsequent step c), the winding 2 is arranged on the draw-in tool 56 by the winding 2 being released from the winding template by means of the merging device 5 in such a way that the draw-in tool 56 passes through the winding interior 11.This is followed by a step d) of drawing the winding 2 into two of the slots 61 by carrying out a relative movement of the drawing-in tool 56 with respect to the stator core 55, wherein those portions of the winding 2 which in the wound position bear on the guide surfaces 6, 7 are arranged in a drawn-in position on the end faces 58, 59 of the stator core 55 and the first of the individual windings 11 ais arranged further radially outwards than the last of the individual windings 11 bin the slots 61. The first of the individual windings 11 ais accordingly located on the slot base 62 in the retracted position.In order to form a complete stator winding of the stator 102 having a plurality of strands and a plurality of pole pairs (see FIG. 5 ), steps b) and c) for forming one of the strands are carried out multiple times in each case for one pole pair and, in step d), the windings produced for the pole pairs of the strand are drawn into different slots. Steps b) through d) are performed for each of the strings in sequence.Within the scope of further exemplary embodiments, it is also possible for the winding template 1 to rotate about the longitudinal axis 9 by means of the first movement device 52 in step b) and / or to be moved along the longitudinal axis 9 by means of the second movement device 53. In this case, the feeding device 51 may be stationary or moved as well. Likewise, in step d), the retraction tool 56 may be inserted into the stator core 55.FIG. 5 is a schematic diagram of an exemplary embodiment of an electric machine 101 in a vehicle 100.The electric machine 101, for example a permanently or electrically excited synchronous motor or an asynchronous motor, has a stator 102 obtained by one of the exemplary embodiments of the method and a rotor 103. The rotor 103 is rotatably supported with respect to the stator 1.The vehicle 100 further includes wheels 104. The electric machine 101 is configured to drive at least one of the wheels 104 indirectly, for example via a transmission (not shown), or directly, for example in the form of a wheel hub motor. The vehicle 100 may further include an axle (not shown) coupled to the wheel 104 that directly or indirectly drives the electric machine 101 of the vehicle 100.The vehicle 100 is a battery electric vehicle (BEV), a fuel cell powered vehicle, or a hybrid vehicle. In the latter case, the vehicle 100 further includes an internal combustion engine (not shown).References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2007 038 429 A1

[0002] DE 10 2018 104 113 A1 [0003, 0018]

Claims

Method for producing a stator (102) for an electric machine (101), the method having the following steps: a) providing a stator core (55) which has two end faces (58, 59) which are axially opposite with respect to a stator longitudinal axis (57), a radially inner lateral surface (60) and a multiplicity of slots (61) which are open to the inner lateral surface (60) and taper from a slot base (62) towards the lateral surface (60); b) producing a winding (2) comprising a plurality of individual windings (11a-e) by winding a wire arrangement (10) around a winding template (1) which has two guide surfaces (6, 7) spaced apart along a transverse axis (8) orthogonal to a longitudinal axis (9) in such a way that the winding (2) surrounds a winding interior (11) which surrounds the longitudinal axis (9) in a position wound on the winding template (1), forming and in that the winding (2) extends along the longitudinal axis (9) from a first of the single windings (11a) to a last of the single windings (11e), wherein the guide surfaces (6, 7) each have an apex line (12, 13) which comprises those points of the guide surfaces (6, 7) which are situated between the first of the single windings (11a) and the last of the single windings (11e) and which are at the widest distance from one another with respect to the transverse axis (8) on a respective one of the planes perpendicular to the longitudinal axis (9), wherein a distance of the apex lines (12, 13) decreases along the longitudinal axis from the first of the single windings (11a) towards the last of the single windings (11e); c) arranging the winding (2) on a draw-in tool (56) by detaching the winding (2) from the winding template (1) in such a way that the draw-in tool (56) passes through the winding interior (11); and d) drawing in the winding (2) in at least two of the slots (61) by carrying out a relative movement of the draw-in tool (56) with respect to the stator core (55), wherein those portions of the winding (2) which in the wound position rest on the guide surfaces (6, 7) are arranged in a drawn-in position on the end faces (58, 59) of the stator core (55) and the first of the individual windings (11a) is arranged further radially outwards than the last of the individual windings (11e) in the slots (61).Method according to claim 1, wherein a distance of both apex lines (12, 13) to the longitudinal axis (9) decreases from the first of the individual windings (11a) to the last of the individual windings (11e).Method according to claim 1 or 2, wherein the wire arrangement (10) is a wire bundle of a plurality of parallel individual wires (63), and in step b), after forming a part of the individual turns (11a-e) comprising the first of the individual turns (11a), a 180-degree rotation about a longitudinal axis of the wire arrangement (10) is formed on one of the guide surfaces (6, 7) and then the further individual turns (11b-d) are formed up to the last of the individual turns (11e).Method according to one of the preceding claims, wherein in step b) the wire arrangement (10) is fed in a straight line by means of a feed device (51) and a relative movement between the feed device (51) and the winding former (1) is carried out along the longitudinal axis.Method according to claim 4, wherein the feeding device (51) rotates about the longitudinal axis (9) or the winding template (1) rotates about the longitudinal axis (9).Method according to claim 4 or 5, wherein, in order to carry out the relative movement between the feed device (51) and the winding template (1), the feed device (51) or the winding template (1) is moved linearly along the longitudinal axis (9)Method according to one of the preceding claims, wherein the guide surfaces (6, 7) are each formed by a guide jaw (3, 4) of the winding template (1), wherein in the wound position the winding is freely tensioned between the guide jaws (3, 4).Method according to claim 7, wherein in step c) the winding (2) is released from the winding template (1) by moving the guide jaws (3, 4) towards each other.Method according to one of the preceding claims, wherein the stator (102) has a plurality of strands and a plurality of pole pairs, wherein steps b) and c) for forming one of the strands are carried out a plurality of times in each case for one pole pair and, in step d), the windings produced for the pole pairs of the strand are drawn into different slots (61).The method of claim 9, wherein steps b) through d) are performed sequentially for each of the strands.Winding template (1) for producing a winding (2) comprising a plurality of individual windings (11a-e), wherein the winding template (1) has two guide surfaces (6, 7) which are spaced apart along a transverse axis (8) orthogonal to a longitudinal axis (9) and which can be wound around by a wire arrangement (10) in such a way that the winding (2) forms a winding interior (11) which surrounds the longitudinal axis (9) in a position wound on the winding template (1), and in that the winding (2) extends along the longitudinal axis (9) from a first of the individual windings (11a) to a last of the individual windings (11e), wherein the guide surfaces (6, 7) are configured in such a way that those points of the guide surfaces (6, 7) which are at the widest distance from one another in a respective one of the planes perpendicular to the longitudinal axis (9) are at an apex line (12, 12, 13) of a respective one of the guide surfaces (6, 7) and a distance of the apex lines (12, 13) along the longitudinal axis (9) decreases from the first of the individual windings (11a) to the last of the individual windings (11e).Winding template according to claim 11, wherein the guide surfaces (6, 7) are each formed by a guide jaw (3, 4) of the winding template (1), so that the winding (2) is freely tensioned between the guide jaws (3, 4) in the wound position.Winding template according to claim 12, wherein the guide jaws (3, 4) are arranged such that they can be moved towards one another, so that the winding (2) can be detached from the winding template (1).Device (50) for producing a stator (102) for an electric machine (101), comprising - a winding former (1) according to one of Claims 11 to 13; - a feed device (51) which is configured to feed the wire arrangement (10); - a first movement device (52) which is configured to rotate the feed device (51) or the winding former (1) about the longitudinal axis (9); - a second movement device (53) which is configured to carry out a relative movement between the feed device (51) and the winding former (1) along the longitudinal axis (9); - a device for providing a stator core (51) which has two end faces (58, 59) which are axially opposite with respect to a stator longitudinal axis (57), a radially inner lateral surface (60) and a multiplicity of slots (61) which are open to the inner lateral surface (60); a draw-in tool (56) which is configured to pass through the winding interior (11) when the winding (2) is released from the winding template (1) and to draw the winding (2) into two of the slots (61) by performing a relative movement of the draw-in tool (56) with respect to the stator core (55), and to arrange portions of the winding (2) which, in the wound position, rest on the guide surfaces (6, 7) in a drawn-in position at the end faces (58, 59) of the stator core (51) and to arrange the first single winding (11a) further radially outwards than the last single winding (11e) in the slots (61).Electric machine (101) for driving a vehicle (100) comprising a stator (102) obtained by a method according to any one of claims 1 to 10 and a rotor (103) mounted rotatably with respect to the stator.

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