Manufacturing method and assembly device for a stator, as well as an electrical machine comprising such a stator

Abstract

A method for manufacturing a stator (10) for an electric machine (11), as well as a stator (10) and an electric machine (11), comprising a stator base body (14) on which an electrical winding (20) with several wire ends (26) is arranged by means of a winding wire (24) sheathed with an insulating layer (27), wherein the several wire ends (26) protrude from an axial end face (15) of the stator base body (14), and the several wire ends (26) are stripped by means of a laser beam (50) to prepare for electrical contact, wherein the laser beam (50) is directed at each wire end (26) and is deflected by means of an optical deflection device (60) such that the laser beam (50) is irradiated with a radial component (52) radially to the direction of extension of the wire end (26) over the entire circumference of the wire end (26) until the insulating layer (27) is stripped over its entire The wire circumference has been removed.

Description

[0001] The invention relates to a manufacturing method and an assembly device for a stator, as well as an electrical machine comprising such a stator according to the preamble of the independent claims. State of the art

[0002] DE 10 2010 064 051 A1 discloses a stator for an electric machine in which insulating masks are axially mounted on individual tooth segments of the stator body. The insulating mask has an axial wall on at least one axial side, in which two through-slots are formed in the radial direction. Two immediately adjacent individual tooth segments can be configured as a coil pair, in which two individual tooth coils are wound with a continuous connecting wire. In this embodiment, two wire ends protrude axially from each of the twin coils and are electrically contacted by a connection arrangement. For this purpose, the wire ends are preferably stripped using cutter heads that mechanically scrape off the insulating layer of the wire ends to provide stripped areas for welding or soldering.This method is very time-consuming, and the cutter head requires a certain minimum distance between the wire ends. These disadvantages are to be overcome by the inventive method for stripping the wire ends. Disclosure of the invention

[0003] The inventive manufacturing method for a stator, as well as the stator and the inventive electrical machine comprising such a stator, according to the preamble of the independent claims, have the advantage that the laser beam can be guided onto the wound stator from above in the production line, and two different laser beams are not necessary to irradiate the wire ends from all radial sides. If the laser beam is guided onto the wire ends in the direction of extension, the wire end can be irradiated from all radial sides over the entire circumference of the wire ends with a single light source via the appropriate deflection device. This allows the area to be stripped at the wire ends to be defined very precisely, and a high cycle time for stripping the wire ends in the production line can be achieved.

[0004] The measures listed in the dependent claims enable advantageous further developments and improvements of the designs specified in the independent claims. For example, if the wire ends protrude from the insulating mask of the stator base body in the axial direction of the stator, the wire ends can be irradiated directly axially from above without having to rotate the stator base body. Irradiation in the direction of extension avoids disruptive scatter radiation of the laser beam, and the laser beam can be deflected into corresponding radial components within a minimal radial installation space, which then strike the insulating layer radially. This heats the insulating layer of the wire ends so intensely that it vaporizes and evaporates. Advantageously, the vaporized insulating particles can be extracted during laser scanning to prevent them from being redeposited on the stator in an undefined manner.

[0005] If the optical deflection device is designed as a concave mirror extending circularly around the direction of the wire end, the laser beams are reflected by the mirror surface and directed with a radial component onto the insulating layer of the wire end. The concave mirror can be very easily attached directly to the wire end, so that it also simultaneously serves as a shield for the stator area that extends radially around the wire end.

[0006] For this purpose, a through-hole is advantageously formed in the center of the concave mirror, through which the wire end extends into the concave mirror. The concave mirror preferably has a conical mirror surface, with the through-hole being coaxial to the cone axis. This results in a conical mirror surface extending around the entire circumference of the wire, from which the laser beam is directed radially inwards onto the insulating layer with a radial component. The frustoconical mirror surface extends axially from the lower through-hole to an axially upper edge of the concave mirror, which is coaxial to the direction of extension of the wire end.

[0007] A funnel-shaped guide can be conveniently formed on the axial back side of the concave mirror, serving as an aid for sliding it axially onto the wire ends. This allows, for example, several concave mirrors to be easily slid axially onto the wire ends simultaneously.

[0008] Preferably, the conical mirror surface is arranged at a cone angle of approximately 45° relative to the direction of extension, as this ensures that the radial component meets the wire end approximately perpendicularly. In alternative embodiments, the cone angle can be shallower, for example, only about 30°, thereby saving radial space for the concave mirror. This allows concave mirrors to be placed on closely adjacent wire ends without colliding with neighboring concave mirrors or wire ends.

[0009] Preferably, the concave mirror is made of metal, particularly copper, with the conical mirror surface formed within the cylindrical base body. The solid metal base body effectively dissipates the heat generated and shields the electrical winding and / or insulating mask located beneath it (in the direction of the laser beam) from laser irradiation. This prevents other parts of the stator from being damaged by the laser radiation when the wire ends are stripped.

[0010] Advantageously, several concave mirrors can be formed in a single work plate, which is then placed axially onto the axially protruding wire ends. The distances between the central holes in the concave mirrors correspond approximately to the distances between the wire ends in the radial plane of the stator. To facilitate placement of the concave mirrors onto the wire ends, corresponding insertion funnels are formed on the rear sides of the concave mirrors, which capture the wire ends during the axial joining process.

[0011] As an alternative to concave mirrors, the deflection device can also be designed as a laser optic in which the laser beam is deflected by means of one or more lenses. In this case, the rays are deflected radially inwards at the radially outer region of the laser beam, so that they have at least a small radial component that strikes the insulating layer of the wire end arranged coaxially to the primary laser beam. This further reduces the space required in the radial plane of the stator compared to concave mirrors. Such a laser optic can preferably be implemented using one or more axicons as laser lenses, which have a corresponding focal length for focusing (refractive axicon) or widening (diffractive axicon) the laser beam.

[0012] The lens optics are arranged axially spaced in front of the wire end in the direction of extension, so that the laser beam is focused by the laser optics onto the circumference of the wire end. The laser optics advantageously comprise one or more cylindrical glass lenses, all arranged concentrically to the direction of extension of the wire end.

[0013] When multiple laser lenses are arranged one behind the other in the direction of extension, the maximum radial extent of the primary laser beam can be adjusted by moving individual lenses, and the focal length of the laser optics can be adjusted accordingly. This allows for the creation of a highly flexible laser optic that can be easily adapted to different wire end geometries, particularly to the wire diameter and the desired length of the area to be stripped.

[0014] When using laser optics, a shielding element is attached to the wire ends, protecting the entire circumference of the wire end behind the point to be stripped from harmful scattered laser radiation. For example, this shielding element, similar to a concave mirror, has a central through-hole into which the wire end is inserted in its longitudinal direction.

[0015] In another embodiment of the stripping process, the wire ends are bent radially away from the stator body. In this arrangement, concave mirrors can be positioned beneath the wire ends, extending radially outwards in a trough-like shape. These trough-shaped concave mirrors reflect the axially incident laser beams and deflect them onto the insulating layer within the radial plane of the wire ends. As a result, the radial components illuminate the wire end from the sides and below, while the primary laser beam strikes the insulating layer directly from above. The trough-shaped concave mirrors advantageously have a semicircular profile, but can also have a parabolic profile, with the wire end positioned at the focal point of the parabolic profile.

[0016] It is particularly advantageous to arrange several such trough-shaped concave mirrors on an annular support that extends them around the entire outer circumference of the stator base. The entire stator base can, for example, be axially inserted into such a support ring until the radially protruding wire ends are positioned at the focal points of the concave mirrors. The primary laser beam preferably comes axially from above and can illuminate the individual concave mirrors arranged side by side in the circumferential direction one after the other. Alternatively, a two-dimensional laser scanning device can scan the entire annular surface of the support in a single process step. If necessary, the area radially inside the support ring can be covered by an additional shielding element to protect the electrical winding from damage.

[0017] To prevent unwanted deposits of so-called "soot" from the evaporated insulating layer during stripping, a gas flow is preferably directed over the concave mirror and / or over the shielding element, carrying away the suspended, separated insulating particles. This not only prevents unwanted soot deposits on the stator but also ensures that the function of the concave mirrors and the laser optics is maintained.

[0018] The stator manufactured according to the invention has an insulating mask with electrical coils wound on it at least on one axial end face. For insulating the stator ring, an insulating mask in the form of two half-shells in opposite axial directions is preferably placed on each individual stator tooth. Preferably, the wire ends are then guided and, if necessary, fixed to the axial end face of the stator ring. Therefore, it is particularly advantageous to position the radial component as close as possible to the axial end face of the insulating masks. The stator body preferably consists of individual T-shaped stator segments, each wound with single-tooth coils.When assembling the stator ring from the individual stator segments, the wiring effort can be significantly reduced if twin or other multiple coils are used, in which two or more single-tooth coils are wound with a continuous winding wire. With this design, the number of wire ends that need to be stripped and then electrically contacted with the wiring device is reduced. A contact or wiring plate is advantageously mounted axially above the stator ring, which is connected to the wire ends of the single-tooth coils. Conductor elements are formed on the wiring plate for this purpose, to which the free ends of the wire ends are preferably welded. For example, the stator has exactly twelve stator teeth, on each of which a single-tooth coil is arranged.In a three-phase configuration of the electric machine, exactly two coils can always be continuously wound to form coil pairs. The stator according to the invention is used in electric machines, for example, in assemblies used in motor vehicles or pedelecs. The electric machine is preferably an internal rotor motor with an external, annular stator and an internal rotor with several permanent magnets. The stator according to the invention is particularly suitable for forming a three-phase electrically commutated machine in which exactly three phase terminals are formed on the stator.

[0019] The stripping method according to the invention is particularly suitable for the so-called pre-cut or click-cut technique, in which the yoke sections can be reassembled in the same way as they were arranged in the stator ring before the individual stator segments were separated. After reassembly, the tangential gaps between the individual yoke sections of the stator segments can be minimized, thereby significantly improving the cogging torque of the electric machine. The assembled stator ring can be inserted axially into a stator housing particularly conveniently, with the wire ends being stripped either before or after insertion into the stator housing.

[0020] The inventive method for stripping the wire ends is advantageously carried out using a mounting device in which a primary laser beam is deflected by means of concave mirrors or optical laser lenses in order to irradiate the wire ends over their entire circumference. This ensures reliable stripping of the wire ends completely over their entire circumference, whereby the energy of the laser beam is introduced directly into the insulating layer, or the winding wire is heated so intensely that the insulating layer is vaporized. Brief description of the drawings

[0021] Exemplary embodiments of the invention are shown in the drawings and explained in more detail in the following description. They show: Fig. 1 an electric machine with a method for stripping wire ends of the electrical winding according to a first embodiment, Fig. 2 schematically a section through a concave mirror of a further embodiment for stripping a wire end, Fig. Figures 3-4 schematically show another embodiment for stripping a wire end using laser optics, and Fig. 5 more variations for stripping radially protruding wire ends.

[0022] In Fig. Figure 1 shows a stator 10 of an electric machine 11, in which an electrical winding 20 is arranged on an annular stator body 14. The stator body 14 is, for example, composed of individual stator segments 12, on which stator teeth 16 extend inwards in the radial direction 7 from a radially outer yoke region 13. Preferably, a single-tooth coil 22 is wound on each stator segment 12. The single-tooth coil 22 can have two wire ends 26, or two or more single-tooth coils 22 can be connected to form multiple coils, thus reducing the number of wire ends 26 accordingly. Insulating masks 18, which support the electrical winding 20, are arranged on the stator teeth 16.At the radially outer yoke area 13, the insulating mask 18 has wire guide elements 38, on which the wire ends 26 are guided upwards in the axial direction 8 at an end face 15 of the stator base body 14, in order to be electrically contacted there with a terminal plate 70. The terminal plate 70 allows the individual tooth coils 22 to be energized and electronically commutated in different phase arrangements. This allows an inner rotor (not shown) to be set in rotational motion, on which permanent magnets are arranged that interact with magnetic poles 30 of the electrical winding 20. The stator base body 14 is inserted into a motor housing 32, in which the rotor is also mounted. The electrical winding 20 is wound here with a round winding wire 25, on the circumference of which an insulating layer 27 is applied, which is, for example, in the form of an insulating varnish.To electrically contact the wire ends 26 with the terminal block 70, it is necessary to create stripped areas 28 at the wire ends 26, where the insulating layer 27 is removed. Fig. 1. These stripped areas 28 at the outermost free ends of the wire ends 26 are produced by means of the laser beam method according to the invention. On the stator 10 shown, for example, exactly six wire ends 26 protrude, whereby not all wire ends 26 are necessarily aligned exactly in the axial direction 8.

[0023] In the right half of the image Fig. Figure 1 shows an enlarged illustration of a first method for stripping the wire ends 26. A concave mirror 62 is slid onto the single wire end 26, with the wire end 26 being inserted into a central hole 64 of the concave mirror 62. The concave mirror 62 has, for example, a round outer circumference and a mirror surface 63 facing the wire end 26, which is designed as a truncated cone surface along whose central axis 61 the wire end 26 extends. If a laser beam 50 is now guided into the funnel-shaped concave mirror 62 along the direction of extension of the wire end 26, it is reflected by the mirror surface 63, so that a radial component 52 of the laser beam 50 strikes the insulating layer 27 of the wire end 26 in radial direction 7. The insulating layer 27 is heated so intensely that it detaches and vaporizes. Therefore, the concave mirror 62 is preferably exposed to a gas flow that carries along the evaporated insulating layer 27.The laser beam 50 is guided, for example, along the arrow in the circumferential direction 9 over the entire circumference of the concave mirror 62, so that the wire end 26 is irradiated from each side with the radial component 52. The axial extent 29 and the axial position of the stripped area 28 can be determined by the radial irradiation area 58 of the mirror surface 63 in the radial direction 7. The irradiation area 58 can be determined in the circumferential direction 9 and / or in the radial direction 7 relative to the direction of extension by scanning the laser beam 50, or a larger portion of the mirror surface 63 can be irradiated simultaneously with the laser beam 50 using optics. The concave mirror 62 has a ring region 67 radially outside the mirror surface 63, which is dimensioned such that the area surrounding the wire end 26 is reliably shielded from the laser beam 50 during stripping. The mirror surface 63 is in . Fig. 1 for example inclined by about 45° relative to the direction of extension, so that the radial component 52 runs approximately perpendicular to the central axis 61 of the conical concave mirror 62.

[0024] In Fig. Figure 2 shows another embodiment of a concave mirror 62 in cross-section. The mirror surface 63 is again conically shaped as a truncated cone around the wire end 26. The angle 68 of the mirror surface 63 to the central axis 61 of the concave mirror 62 is approximately 60°, so that the radial component 52 of the laser beam 50 strikes the insulating layer 27 obliquely to its direction of propagation. It can be seen that irradiating the mirror surface 63 along a predetermined radial range 58 leads to a corresponding axial expansion 29 of the stripped area 28. By choosing the steeper angle 68 to the direction of propagation, the outer diameter 57 of the mirror surface 63 can be made correspondingly smaller, which allows even closely adjacent wire ends 26 to be stripped using such a steeper concave mirror 62.In this schematic embodiment, the extent of the ring area 67 is practically negligible in order to minimize the maximum diameter of the concave mirror 62. An insertion funnel 65 is formed on the underside of the concave mirror 62 facing the stator 10, which facilitates the insertion of the wire end 26 into the central hole 64.

[0025] Fig. Figure 3 shows a further deflection device 60 for the laser beam 50, which is designed as a lens optic 70. The laser beam 50 of a specific radial extent 73 is deflected at a first lens 71a such that the radial components 52 of the laser beam 50 are focused onto the central axis 61, along which the wire end 26 extends. It is not necessary for the laser beam 50 to scan a certain area; rather, due to its radial extent 73, the radially outer regions of the laser beam 50 are focused at a different point on the central axis 61 in the axial direction 8 than the radially inner regions of the laser beam 50. The first lens 71a is designed as an axicon 72, the surface 77 of which has a lens angle 78 towards the wire end 26, which determines a focal length 79 of the focus of the laser beam 50.Due to the deflection by the first laser lens 71a, the laser radiation 50 also acquires a radial component 52, which then strikes the insulating layer 27 at an oblique angle to its direction of propagation. The radial extent 73 of the laser beam 50 and the lens angle 78, together with the diameter 24 of the winding wire 25, determine the axial extent 29 of the stripped area 28. The wire end 26 is inserted into a shielding element 80, so that the area around the wire end 26 is shielded from the laser beam 50 to prevent damage to the electrical winding 20 or the insulating mask 18. The shielding element 80 has a through-opening 82 into which the wire end 26 is inserted along its direction of propagation.

[0026] In Fig. Figure 4 shows a further variation of the method for stripping the wire ends 26, in which the deflecting device 60 for the laser beam 50 has a total of three cylindrical laser lenses 75. By interchanging a first laser lens 71a with a second laser lens 71b, the radial extent 73 of the laser beam 50 can be adjusted. In a third laser lens 71c, the laser beam 50 is focused again onto the wire end 26 to vaporize its insulating layer 27. The third laser lens 71c is designed as a convex cylindrical lens, the curvature of which again determines the focal length 79 of the radial components 52. If the second lens 71b is now moved along the adjustment path 84, the axial extent 29 of the stripped area 28 can also be influenced via the radial extent 72 of the laser beam 50.In this embodiment, the wire end 26 is bent outwards in radial direction 7, so that the laser beam 50 is also directed towards the wire end 26 in radial direction 7. The wire end 26 is, for example, part of a single-tooth coil 22 which is wound onto a stator tooth 16 of the stator base body 14.

[0027] In Fig.Figure 5 shows a further variant of a method for stripping the wire ends 26, in which preferably several – in particular all – wire ends 26 are stripped simultaneously. The concave mirror 62 has an annular support element 90, which is arranged around the circumference of the stator base body 14. Several concave mirrors 62 are arranged around the circumference of the support element 90, forming a channel extending radially 7. The wire ends 26 are also bent in the radial direction 7 so that they run approximately parallel to the mirror channel 91. The mirror channel 91 can, for example, be parabolic or semicircular, so that laser beams 50, which strike the channel-shaped mirror surface 63 from above in the axial direction 8, are deflected in a radial plane to the direction of extension of the wire end 26, and thus also strike the insulating layer 27 from the side and from below.The wire end 26 is directly irradiated from above with the laser beam 50, so that the entire circumference of the wire end 26 is covered by the laser beams 50 and 52. In this process, the insulating layer 27 is vaporized again and drawn away inwards or outwards by the gas flow 99 in the radial direction 7. In this embodiment, for example, six wire ends 26, which project from the stator base body 14 in the axial direction 8, are all bent outwards at approximately right angles in the radial direction 7. Preferably, the entire stator base body 14 is inserted into the support ring 90 for the concave mirrors 62, so that all wire ends 26 are arranged at the focal point of a trough-shaped mirror surface 63 around the entire circumference of the stator base body 14. The axial extent 29 of the stripped area 28 can again be determined by the radial extent of the mirror surface 63, or by the area of ​​the mirror surfaces 63 irradiated by the laser beam 50 in radial direction 7.Optionally, the individual wire ends 26 can be irradiated sequentially by the laser beam 50 – or all mirror surfaces 63 can be irradiated in a single process step using a laser scanner. In this process, the laser beam 50 scans the area 92 of the ring-shaped support element 90, whereby, if necessary, the central inner area within the ring-shaped support element 90 is shielded by means of a shielding element 80.

[0028] It should be noted that with regard to the embodiments shown in the figures and in the description, numerous combinations of the individual features are possible. For example, the specific design, arrangement, and number of wire ends 26 and coils 22 can be varied. Directly adjacent twin coils or multiple coils can also be wound, thereby reducing the number of wire ends 26. The stripping process can be used for any wire diameter 24, with the stripped area 28 being formed at the very end of the wire end 26 or just before it. The mirror surfaces 63 and / or the lens optics 70 can be adapted to the laser used and the required size of the stripped areas 28.Various wiring configurations can be implemented via electrical contact with the terminal block 70, for example, a delta or a star connection. The invention is particularly suitable for driving pumps or units in motor vehicles, but is not limited to this application. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2010 064 051 A1

[0002]

Claims

[1] Method for manufacturing a stator (10) for an electric machine (11), comprising a stator base body (14) on which an electrical winding (20) with several wire ends (26) is arranged by means of a winding wire (24) sheathed with an insulating layer (27), wherein the several wire ends (26) protrude from an axial end face (15) of the stator base body (14), and the several wire ends (26) are stripped by means of a laser beam (50) to prepare for electrical contact, wherein the laser beam (50) is directed at each wire end (26) and is deflected by means of an optical deflection device (60) such that the laser beam (50) is irradiated with a radial component (52) radially to the direction of extension of the wire end (26) over the entire circumference of the wire end (26) until the insulating layer (27) is removed over its entire circumference. [2] Method according to claim 1, characterized by, that the laser beam (50) is directed towards the wire end (26) in the direction of extension of the wire end (26) in front of the optical deflection device (60) - wherein in particular the wire end (26) protrudes in the axial direction (8) of the stator base body (14) from an insulating mask (18) arranged on the stator base body (14). [3] Method according to claim 1 or 2, characterized by , that the optical deflection device (60) has a concave mirror (62) which is arranged circularly around the circumference of the wire end (26) - and in particular is pushed onto the wire end (26) in the direction of extension. [4] Method according to any one of the preceding claims, characterized by, that the concave mirror (62) is cylindrical with a central hole (64) for the wire end (26), wherein a mirror surface (63) extends in a frustoconical or parabolic shape from the central hole (64) to an axial circular edge (66) of the concave mirror (62) - wherein preferably an insertion funnel (65) for the wire end (26) is formed on the back of the concave mirror (62). [5] Method according to any one of the preceding claims, characterized by , that the mirror surface (63) is inclined by an angle (68) of 20° to 60° - in particular about 45° - relative to the direction of extension. [6] Method according to any one of the preceding claims, characterized by , that the concave mirror (62) serves as a shielding element (80) for the area surrounding the wire end (26) - and in particular the concave mirror (62) is made of metal, preferably copper. [7] Method according to any of the preceding claims, characterized by, that several concave mirrors (62) are integrated into a work surface (69) and several wire ends (26) are simultaneously inserted in the extension direction into the central holes (64) of the several concave mirrors (62). [8] Method according to any one of the preceding claims, characterized by , that the optical deflection device (60) comprises a lens optic (70) - in particular a refractive or diffractive axicon (72) - by means of which the parallel laser beam (50) is transformed from a radially outer annular region (74) such that its beams have radial components (52) which are concentrated radially inwards onto the insulating layer (27). [9] Method according to any of the preceding claims, characterized by , that the lens optics (70) is arranged spaced apart in the direction of extension from the wire end (26), wherein the lens optics (70) has at least one cylindrical lens (75) which is arranged coaxially to the wire end (26). [10] Method according to any of the preceding claims, characterized by , that the lens optics (70) has at least two cylindrical lenses (75) which are spaced apart from each other in the direction of extension - wherein in particular a focus (76) of the radial components (52) can be adjusted in the direction of extension by moving at least one lens (75). [11] Method according to any of the preceding claims, characterized by , that during irradiation with the lens optics (70) a shielding plate (80) is pushed onto the wire end (26) in the direction of extension, wherein in particular the wire end (26) is inserted into a through-opening (82) of the shielding plate (80). [12] Method according to any of the preceding claims, characterized by, that the wire ends (26) protrude in radial direction (7) from the front face (15) of the stator base body (14), and the concave mirror (62) is arranged semicircularly around each wire end (26), and the laser beam (50) is directed in axial direction (8) towards the concave mirror (62) and is deflected in such a way that it also hits the insulating layer (27) from below with the radial component (52) from the concave mirror (62). [13] Method according to claim 12, characterized by , that several concave mirrors (62) are arranged in a ring-shaped support element (90) which is pushed axially over the circumference (17) of the stator base body (14) - and in particular all concave mirrors (62) are irradiated by means of a single laser scan (92) to remove the insulating layers (27). [14] Method according to any of the preceding claims, characterized by, that a gas flow (99) is guided over the concave mirror (62) and / or over the shielding element (80) to remove soot from the evaporated insulating layer (27). [15] Electric machine (11) with a stator (10) manufactured according to one of the preceding claims, wherein a switching plate (40) is arranged axially above the stator base body (14), and the wire ends (26) of the electrical winding (20) stripped by means of the laser beam (50) are electrically connected to the switching plate (40) - wherein in particular the stator base body (14) is composed of individual T-shaped stator segments (12), each of which is wound with single-tooth coils (22), and preferably a rotor having a permanent magnet is mounted inside the stator (10), which can be driven by the single-tooth coils (22) of the stator (10). [16] Assembly device for manufacturing an electric machine (11) according to claim 15, comprising an optical deflection device (60) for a laser beam (50) directed in the axial direction (8) towards the end face (15) of the stator base body (14), wherein the optical deflection device (60) comprises concave mirrors (62) or lenses (75) which deflect the laser beam (50) such that a radial component (52) of the laser beam (50) is generated which strikes the wire ends (26) radially in order to remove an insulating layer (27) of the wire ends (26).

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