Stator for electric machine, electric machine having stator and method for producing stator

Abstract

The invention relates to a stator (10), in particular for an electric machine (12), to an electric machine (12), and to a method for producing a stator (10), comprising a stator base body (13) which has a yoke region (24) from which stator teeth (26) extend in a radial direction (7), on which stator teeth (26) single-tooth coils (40) are arranged, a wire end (44) of the single-tooth coil (40) is electrically connected to a conductor element (56) of a wiring device (54), the conductor element (56) extending over the single-tooth coil (40) in a circumferential direction (9) and having an axial through-hole (46) into which the wire end (44) extends in an axial direction (8), and the wire end (44) is connected to the conductor element (56) in a cohesive manner.

Description

Technical Field

[0001] The invention relates to a stator for an electric machine, as well as an electric machine having a stator and a method for producing a stator according to the independent claim type. Background Art

[0002] DE 10 2015 200 086 A1 describes a method for manufacturing a stator, in which a single-tooth coil is completely wound on a plurality of stator teeth with an uninterrupted winding wire. Here, the connecting wires between the individual coils are tensioned along the circumferential direction between the axial protrusions of the insulating cover. For the electrical connection of the single-tooth coils, these single-tooth coils are electrically connected to the conductor element at the connecting wires. The conductor element has a connecting pin for electrical commutation at one end. At the other end, a welding hook is formed on the conductor element, which surrounds the tangential connecting wires and is welded to these connecting wires. In the embodiments of these conductor elements, only one connecting wire can be electrically contacted with the conductor element. The so-called hot build-up welding method is used here, in which sufficient structural space must always be reserved for the positioning of the welding tongs. In addition, this welding tongs is also subject to wear phenomena, which makes the electrical contact method more expensive. These disadvantages should be eliminated by the embodiment according to the present invention. Summary of the invention

[0003] In contrast, the device according to the invention and the method according to the invention with the features of the independent claims have the advantage that the axial structural length of the stator can be significantly reduced by directly connecting the coil wire ends to the flattened region of the conductor element facing the electronics unit. Due to the design of holes drilled in the preferably flattened region of the conductor element, the coil wire ends can be directly inserted into these holes and electrically connected to the conductor element. This eliminates the need for, for example, forming of welded hooks on the conductor element for contacting the coil wire ends, which significantly simplifies the production process of the conductor element and reduces costs.

[0004] The measures explained in the dependent claims enable advantageous developments and improvements to the embodiments specified in the independent claims. The conductor element is particularly advantageously designed as a flat material in the circumferential region of the through-hole for the wire, the dimensions of the flat material in the axial direction being smaller than its dimensions in the radial direction, wherein the conductor element preferably extends in a ring-shaped manner in the circumferential direction. This creates a defined flat surface of the conductor element, at which the wire end embedded in the through-hole can be connected to the conductor element in a defined material fit. This flattened cross section preferably extends only over the circumferential region of the through-hole, but can optionally also extend over a larger circumferential region, the entire circumferential region, of the conductor element.

[0005] The electrical winding is advantageously designed as a single-tooth winding, wherein exactly one single-tooth coil is wound on each stator tooth. The wire ends of this coil extend in the axial direction toward the conductor element and extend through its through-bores. As a result, the ends of the coil wires can be welded or soldered to the conductor element on the axial surface of the conductor element facing away from the coil, for example. This has the decisive advantage that the wiring device, to which the conductor element is fixed on the upper surface, does not have to be turned during installation, since the wire coming from below can also be connected directly to the conductor element on the upper surface. Preferably, a soldering point is configured in which the material of the wire end is melted to the upper surface of the conductor element.

[0006] In this case, a laser welding method can be used in a very advantageous manner in terms of production technology, so that no wear of the electrodes occurs during welding. Furthermore, no surface treatment, such as galvanizing, is required before the connection process. By welding the connection, a weld dome is produced on the upper surface of the conductor element, which weld dome optionally protrudes slightly in the axial direction beyond the flattened surface of the conductor element.

[0007] It is very cost-effective to use a round metal wire as a conductor element, which is accordingly bent circularly in the circumferential direction and can also be manufactured in one piece with the connecting pins for the conductor element. In order to form the flattened area, the round cross section of the metal wire can be flattened by means of plastic material deformation in a simple manner, for example, with a punch. Thus, a cross section of the conductor element is preferably generated, which has an upper and lower surface in this circumferential area, and the surfaces extend almost parallel to each other and transversely to the axial direction. The flattened area is preferably bent so that the lower surface can be flatly attached to the supporting ring of the wiring device. For this reason, the area with the round wire diameter is particularly bent axially, for example, away from the supporting ring. A through-drilling is then formed in the flattened area, and the wire end is embedded in the through-drilling.

[0008] If a wire with insulating varnish is used to form the conductor element, this insulating varnish is removed, for example, in the flattened region, so that the wire ends can then be reliably welded to the upper surface of the conductor element in the flattened region. In this embodiment, the insulated region of the conductor element is reliably protected against electrical short circuits. In an alternative embodiment, a wire without insulating varnish can also be used, thereby eliminating the process step of stripping the flattened region. However, the uninsulated regions of the conductor element must be sufficiently spaced from one another or protected from one another by other insulating structures.

[0009] It is particularly advantageous that the connecting pins to the electronic unit are integrally connected to the area of ​​the conductor element extending in the circumferential direction. For this reason, the connecting pins can be bent upwards in a simple manner in the axial direction, for example, almost at a bending angle of about 90 °. Here, the conductor element can be configured as a punched part or deformed from a wire with a circular cross section, for example. The flattened areas with the through holes for the wire ends are thus also integrally connected to the connecting pins, respectively. This simplifies production and also reduces contact resistance.

[0010] If the terminal device has an annular disk made of insulating material as a support ring, the conductor elements can be fixed directly on this annular disk. The annular disk extends in a radial plane around the stator center axis, wherein the conductor elements rest on the upper surface of this disk. These conductor elements can be fixedly fastened to the annular disk, for example by means of clamping elements, regardless of the cross section of the conductor elements.

[0011] If the annular disk is made of plastic, for example by means of injection molding, the clamping element can be integrally formed directly onto the annular disk during the injection molding. The plastic has elastic properties in this case, so that the clamping tabs are elastically stretched apart when the conductor element is inserted and rest elastically against the conductor element after the conductor element has been completely inserted. During the injection molding, an axial recess can be left in the annular disk, so that preferably an injection molding tool without a slide can be used.

[0012] During the injection molding, axial retaining tabs for the connecting pins can also be formed so that the connecting pins are mechanically stabilized and precisely positioned. The connecting pins of all conductor elements can be fastened in a common retaining tab, for example, which has a plurality of receptacles for the connecting pins extending in the axial direction. The retaining tab can also be designed, for example, as part of a plug terminal, by means of which the electronic unit is contacted.

[0013] In order to enable the wire end of the coil to be embedded in the through-hole of the conductor element in the axial direction, the supporting ring of the wiring device also has an axial through-opening at the same position. The wire end then first passes through the through-opening of the supporting ring and then directly passes through the through-drilling of the flattened area of ​​the conductor element. In this case, the through-opening of the supporting ring can have a larger diameter than the through-drilling of the conductor element, which is coordinated with the wire diameter of the free wire end. In order to make it easier to thread the wire end, an introduction cone is formed on the surface below the disk, and the introduction cone can also protrude axially from the lower side of the annular disk in particular.

[0014] A support element is formed on the axially lower side of the support ring axially opposite the retaining tab for the connecting pin, by means of which the terminal device is supported axially on the stator base body. The axial support element is preferably also formed integrally with the support ring from plastic by injection molding. In this case, the axial support element either directly rests on a sheet metal sheet of the stator base body or on an insulating cover for a single-tooth coil. When the terminal device is axially mounted, the wire end is then axially embedded in the through-opening and the through-drilling, wherein the terminal device is particularly embedded axially until the axial support element is supported on the stator base body.

[0015] In order to achieve a reliable welded connection between the wire end and the flattened area of ​​the conductor element, the latter is tensioned axially relative to the upper side of the support ring by means of a clamping element. For this purpose, the clamping element preferably extends radially in the flattened area in the axial direction beyond the upper surface of the conductor element and presses the flattened area against the upper side of the support ring with the latching hooks. The flattened area can thereby also be precisely positioned relative to the support ring in the radial direction at the same time.

[0016] Preferably, exactly two through-bores are formed next to each other in exactly one flattened region. The two wire ends embedded in these through-bores preferably belong to two different single-tooth coils. When winding the stator teeth, for example, a plurality of single-tooth coils are completely wound with an uninterrupted winding wire, wherein the two wire ends embedded in a single flattened region of the conductor element in particular form the beginning and / or end of an electrical phase.

[0017] Each stator segment preferably has a separate insulating cover. In this case, for example, a first insulating shell is axially mounted from above and a second insulating shell is axially mounted from below on the stator segment. In this case, the insulating cover covers the toothed bar on the one hand and radially extends beyond the toothed bar into the yoke region of the stator segment. In the yoke region, an axial projection is formed on the insulating cover, which extends toward the mounted terminal block. The tangential dimension of the axial projection is in particular smaller than the tangential extension of the yoke region of the stator segment, so that a gap is left between two adjacent axial projections, into which gap a connecting line between the individual tooth coils is bent radially, for example.

[0018] The stator is preferably used in an electric machine, which is designed, for example, as an electronically commutated EC motor. The stator consists in particular of individual T-shaped stator segments, which are joined to form a closed stator ring after winding. The rotor is arranged radially in the stator, which is supported in a stator housing. The electrical winding of the stator consists of single-tooth coils, which are driven by the control electronics of the electric machine. For this purpose, the single-tooth coils are connected to the electronic unit via conductor elements and their connecting pins. The electronic unit is preferably positioned axially directly above the connection device.

[0019] The stator according to the invention is produced in particular by a pre-cutting or click-cutting method, in which the individual stator segments are initially connected to one another in a closed stator ring. When punching out the sheet metal sheets, the individual T-segments are particularly advantageously connected to the axially adjacent sheet metal sheets in one working step by means of a punching package. After the individual sheet metal sheets of the T-segment are separated, the punching package securely holds the individual sheet metal sheets of the T-segment in the axial direction relative to one another, so that their toothed rods can be wound in a simple manner by means of a coil wire. In this case, two or more T-segments can be wound continuously with one another by means of an uninterrupted winding wire. In order to wind the stator segments, the stator segments are in particular arranged at a tangential spacing from one another, so that, for example, a needle winder has sufficient space between the individual stator teeth. In this case, the single-tooth coils are connected to one another by means of an uninterrupted connecting wire. This has the advantage that fewer coil wire ends must be wired individually. The stator segments are then compressed together radially until they touch one another tangentially. In order to actuate the single-tooth coil, the terminal block is pushed through the insulating cover and thereby makes electrical contact with the single-tooth coil.

[0020] According to the manufacturing method according to the invention, the stator teeth are first wound, wherein the free wire ends of the coils protrude axially upward. To construct the wiring device, the conductor element is fixed, in particular firmly clamped, on a support ring, and the wiring device is then axially mounted on the stator base body. When the wiring device is axially mounted, the free wire ends slide into corresponding through-bores in the conductor element and can then be electrically contacted. The conductor element preferably has a flat upper surface, which is welded in particular to the free wire ends. Preferably, a welding spot is constructed in this case, in which the material of the wire ends is melted with the material of the conductor element. The welding spot is particularly advantageously constructed contactlessly by means of laser welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.

[0022] Figure 1 and 2 A first embodiment of the wiring device according to the present invention is shown;

[0023] Figure 3a and 3b By pressing Figure 1 The detailed view schematically shows the method for manufacturing the stator according to the present invention;

[0024] Figure 4 A comparison between conventional contacting of a terminal arrangement and contacting according to the invention is schematically shown; and

[0025] Figure 5 An electric machine having a stator according to the invention is shown. DETAILED DESCRIPTION

[0026] exist Figure 1 , an embodiment of a wiring device 54 is shown, which has an annular disk 53, which extends transversely to the axial direction 8 in a radial plane. A conductor element 56 is arranged on the upper surface 91 of the annular disk 53 in the axial direction, and the conductor element extends in the circumferential direction 9. The conductor element 56 is preferably fixed to the annular disk 53 with a clamping element 85. The annular disk 53 is made, for example, as a plastic injection molded component, and the clamping element 85 is integrally formed on the plastic injection molded component. The conductor element 56 can be configured as a metal wire 83 with a circular cross section. An axial through hole 46 for accommodating the wire end 44 of the electrical winding 41 is formed on the conductor element 56. The circumferential region 45 of the conductor element 56, on which the through hole 46 is configured, is flattened by means of plastic material deformation in this embodiment, so that the circular cross section of the metal wire 83 is at least almost converted into a rectangular cross section 70 in the circumferential region 45. The circumferential region 45 then rests with the lower end face 82 on the upper surface 91 of the annular disk 53. There, the corresponding axial through-opening 65 is formed flush with the through-opening 46 of the conductor element 56 in the annular disk 53. Figure 3a Insertion is axially performed through the axial through-opening 65 and subsequently through the axial through-hole 46. Figure 1 In the embodiment of the present invention, a plurality of, for example, three separate conductor elements 56 are fixed on the annular disk 53, and the conductor elements extend over different angular ranges so as to contact the corresponding single-tooth coil 40 of the electrical winding 41 with the electronic unit 20 via the connecting pins 58. At each conductor element 56, for example, exactly two through-holes 46 are formed, which are preferably arranged tangentially adjacent in the flattened circumferential region 45. The connecting pins 58 extend in the axial direction 8 and are integrally formed with the conductor element 56 by an almost right-angled bend 89. The connecting pins 58 are fastened to the axial retaining tabs 50, which are integrally formed on the disk 53 in the axial direction 8. In this embodiment, all the connecting pins 58 can be combined into a common plug terminal 59, in which the individual connecting pins 58 can be accommodated in a common plug collar 60. A supporting element 86 , by means of which the terminal device 54 can be supported axially on the stator base body 13 , extends from the annular disk 53 axially opposite the retaining web 50 in the axial direction 8 .

[0027] Figure 2 The view from below shows Figure 1The conductor element 56 is preferably not arranged on the lower surface 92 of the annular disk 53. At the through-opening 65 of the annular disk 53, a guide funnel 63 is formed on the lower surface 92, at which the wire end 44 can slide into the through-opening 65. At the lower surface 92, a support element 86 for fastening the wiring device 54 is formed on the stator ring 14. In the region of the clamping element 85, a notch 80 is formed in the annular disk 53 using injection molding technology, through which the conductor element 56 can be seen, and the conductor element is firmly clamped on the upper surface 91. The clamping element 85 for the metal wire 83 has two elastic tabs 79, which are in a radial direction 7 and abut on both sides of the metal wire 83. When the wire 83 is inserted axially, the elastic webs 79 are stretched apart in the radial direction 7 and the wire 83 is then securely fixed in the axial direction 8 and in the radial direction 7 after it has been completely pressed between the elastic webs 79. The recess 80 in the annular disk 53 is formed radially between the two elastic webs 79. On the radial inner side of the annular disk 53, in particular sleeve-shaped projections 77 are formed which mechanically stabilize the annular disk 53. On the radially outer circumference 55, radial recesses 73 are formed on the annular disk 53, through which recesses the stator ring 14 is held axially accessible to the installation tool after the wiring device 54 has been axially inserted.

[0028] Figure 3a Shows the Figure 1 , in which the terminal device 54 has been inserted onto the stator ring 14. The wire ends 44 of the single-tooth coils 40 have been guided through the guide funnel 63 and through the through-opening 65 of the annular disk 53 and through the through-holes 46 of the conductor elements 56 during installation. The free ends 48 of the wire ends 44 protrude slightly axially beyond the end side 81 above the flattened circumferential region 45. The cross-section 70 of the flattened circumferential region 45 is approximately rectangular in design, so that its radial extension 71 is greater than its axial dimension 72. The flattened circumferential region 45 is held axially on the annular disk 53 by the locking hooks 87, wherein the locking hooks 87 are resiliently retracted, in particular radially inwardly, when the circumferential region 45 is pressed in axially until the circumferential region 45 is securely locked. Figure 3a Schematically shows a transition region 90 in which the circular cross section of the wire 83 is transformed into the rectangular cross section 70 of the flattened circumferential region 45. The two free ends 48 come, for example, from two different single-tooth coils 40, which in particular form the beginning and end of a single electrical bevel.

[0029] exist Figure 3bIn the next assembly step, the free end 48 of the wire end 44 is now electrically connected to the upper end face 81 of the flattened area 45 by material bonding. For this purpose, the free end 48 is melted into a welding spot 88, which melts with the conductor element 56. For this purpose, a laser spot welding method is used, for example, so that no structural space needs to be reserved for welding tongs. The welding spot 88 protrudes only slightly from the upper end face 81 of the flattened circumferential area 45 in the axial direction 8 as a welding dome 98. Thus, an electrical contact between the wire end 44 and the conductor element 56 is formed with a very small axial structural space 101. The flattened circumferential area 45 preferably has no insulating structure at the through-hole 46, so that the wire end 44 can be safely welded to the conductor element 56. For this purpose, for example, a bare metal wire 83 can be used, or alternatively, an insulated metal wire 83 that is only stripped in the circumferential area 45 of the through-hole 46 can be used. The flattened circumferential area 45 can be deformed very easily by means of a punch.

[0030] exist Figure 4 4 shows the difference from conventional contacting, in which conventional wire ends 144 are firmly welded to welding hooks 104 extending axially above the annular disk 53 by means of welding tongs (shown by dashed lines). The axial structural space 102 for this conventional embodiment is significantly higher than the axial structural space 101 for laser spot welding. The contacting according to the invention is shown here in a cross section of the through-opening 65 and the through-hole 46. The circumferential region 45 of the conductor element 56 is flat against the upper surface 91 of the annular disk 53. The rectangular cross section 70 of the flattened circumferential region 45 is held on the annular disk 53 in a form-fitting manner by the latch hooks 87. In this context, a clamping element 85 having two radially opposite elastic tabs 79 is shown, which clamps the metal wire 83 having a circular cross section on the annular disk 53 in a form-fitting manner. The electrical winding 41 is configured here in the form of a single-tooth coil 40, which is wound individually on the stator teeth 26 of the stator 10. The wire ends 44 of the single-tooth coils 40 then extend from the stator teeth 26 in the radial transition region to the yoke region 24 from the insulating cover 30 in the axial direction 8 toward the terminal arrangement 54. The terminal arrangement 54 is supported on the stator ring 14 via support elements 86 and / or via sleeve-shaped projections 77, either directly on the sheet metal sheets 15 of the stator base body 14 and / or on the insulating cover 30. The stator 10 is inserted into a stator housing 17, which is designed to be open at the top in the axial direction.

[0031] Figure 5An electric motor 12 is shown in which a stator 10 according to the invention is axially embedded in a stator housing 17 along a stator center axis 11. A first bearing 18 for a rotor 31 is arranged in the stator housing 17, which first bearing is supported in the stator 10. The rotor 31 is supported via a second bearing 19 in a bearing cover 32, which closes an axial opening of the stator housing 17. The rotor shaft 33 of the rotor 31 protrudes from the stator housing 17 into a hydraulic unit 37 in order to drive a pump, for example, via an output element 38. Connecting pins 58 are also guided through the hydraulic unit 37 to an electronics unit 20, which is arranged axially opposite the hydraulic unit 37. The electronics unit 20 has, for example, an electronics board 21, on which plugs 23 for the connecting pins 58 are arranged. In this case, the plug 23 engages in a plug collar 60 of a plug terminal 59, into which the individual connecting pins 58 merge with the axial retaining webs 50. The electric motor 12 can be commutated preferably electrically by means of the electronics unit 20.

[0032] The stator 10 is preferably assembled from individual T-shaped stator segments 22, each of which has a radially outer yoke region 24, from which stator teeth 26 extend inwardly in a radial direction 7. An insulating cap 30 is respectively placed on each stator segment 22, and an electrical winding 41 is wound onto the insulating cap. The insulating cap 30 has an axial projection 39, which extends in the axial direction 8 in the extension of the yoke region 24. The axial projection 39 has a guide structure for a connecting wire on its radial outer surface, by means of which the electrical winding 41 of the individual toothed rods 26 is connected to one another. The electrical winding 41 is assembled from single-tooth coils 40, the number of which corresponds to the number of stator segments 22. The stator segments 22 are wound individually, wherein at least two single-tooth coils 40 are wound with uninterrupted, continuous winding wire. The winding wires form connecting wires between the individual tooth coils 40, which are guided on the radially outer circumference of the axial projections 39. The stator segments 22 each consist of sheet metal sheets 15 stacked axially one above the other, which are preferably punched. For example, the individual sheet metal sheets 15 are connected to one another in the axial direction 8 by means of a punch package.

[0033] It should be noted that, with regard to the embodiments shown in the figures and in the description, various combinations of the individual features are possible. Thus, the plastic ring 53 can, for example, have other contours, in particular also have cylindrical axial protrusions at the radially outer circumference. The number and geometry of the conductor elements 56 and the through-holes 46 can be matched to the number of stator teeth 26 or the number of single-tooth coils 40. The configuration of the support element 86 and the clamping element 85 can also be changed. The flattened circumferential area 45 for the through-holes 46 can alternatively be manufactured as a flat conductor strip, in particular as a bent stamping part made of sheet metal, for the deformation of the metal wire 83 with a circular cross section. The individual stator segments 22 are preferably manufactured by means of so-called pre-cutting technology or click shearing technology, but other single-tooth segments 22 can also be used, in which at least two single-tooth coils 40 are completely wound, in particular with an uninterrupted winding wire. The present invention is particularly suitable for rotating drive components or adjustment components in motor vehicles, but is not limited to such applications.

Claims

1. A stator (10), in particular a stator for an electric machine (12), comprising a stator base body (13), the stator base body having a yoke region (24), stator teeth (26) extending from the yoke region in a radial direction (7), wherein: A single-tooth coil (40) is arranged on the stator tooth (26), wherein a wire end (44) of the single-tooth coil (40) is electrically connected to a conductor element (56) of a wiring device (54), wherein the conductor element (56) extends in a circumferential direction (9) above the single-tooth coil (40) and has an axial through-hole (46), the wire end (44) extends into the through-hole in an axial direction (8), and the wire end (44) is materially connected to the conductor element (56).

2. The stator (10) according to claim 1, characterized in that: The conductor element (56) has a cross section (70) in a circumferential region (45) of the through-hole (46) which is thinner in an axial direction (8) than in a radial direction (8) or in particular thinner in a tangential direction (7).

3. The stator (10) according to claim 1 or 2, characterized in that: The wire end (44) of the single-tooth coil (40) protrudes at an upper end side (81) of the conductor element (56) opposite the single-tooth coil (40) and is fused to the upper end side (81) of the conductor element (56), in particular by means of a welding spot (88).

4. A stator (10) according to any one of the preceding claims, characterized in that The weld point (88) is formed by means of laser welding as a circular weld dome (98), which projects in the axial direction (8) beyond the upper end face (81) of the conductor element (56).

5. The stator (10) according to any one of the preceding claims, characterized in that The conductor element (56) is designed as a wire (83) having a circular cross section, which is flattened by means of plastic deformation in a circumferential region (45) of the through-hole (46).

6. A stator (10) according to any one of the preceding claims, characterised in that The wire (83) has an insulating varnish (84) which is stripped off, in particular in a circumferential region (45) of the through-hole (46).

7. A stator (10) according to any one of the preceding claims, characterised in that The conductor element (56) has a connection pin (58) for the control electronics (20), which extends along the axial direction (8) and is integrally connected to the circumferential region (45) of the through-hole (46), in particular by means of a bend (89) of the metal wire (83).

8. A stator (10) according to any one of the preceding claims, characterised in that The terminal device (54) has an electrically insulating annular disk (53) which extends transversely to the axial direction (8), and the conductor element (56) is fixed to the upper surface (91) of the annular disk, in particular by means of a clamping element (85).

9. A stator (10) according to any one of the preceding claims, characterised in that The annular disk (53) is designed as a plastic injection-molded part, on which the clamping element (85) is integrally formed, and on the annular disk (53) axial retaining webs (50) for the connecting pins (58) are arranged in particular integrally, wherein all connecting pins (58) are preferably fastened to a single common retaining web (50).

10. The stator (10) according to any one of the preceding claims, characterized in that In the annular disk (53), an axial through-opening (65) is formed flush with a through-hole (46) of the conductor element (56), and a wire end (44) of the single-tooth coil (40) extends through the axial through-opening into the through-hole (46) of the conductor element (56), wherein a guide funnel (63) for the wire end (44) is formed at the through-opening (65), in particular at a lower surface (92) of the annular disk (53).

11. The stator (10) according to any one of the preceding claims, characterized in that An axial support element (86) is formed on the annular disk (53) axially opposite the conductor element (56), by means of which the terminal device (58) is supported on the stator base body (13), in particular via an insulating cover (30) for the single-tooth coil (40) arranged on the stator base body.

12. The stator (10) according to any one of the preceding claims, characterized in that In the flattened circumferential region (45) of the through-hole (46), a respective latching projection (87) of a clamping element (85) presses the conductor element (56) axially against an upper surface (91) of the annular disk (53), wherein the latching projection (87) is integrally formed on the annular disk (53) in particular radially within the conductor element (56).

13. The stator (10) according to any one of the preceding claims, characterized in that On the flattened circumferential region (45), exactly two through-holes (46) are arranged directly adjacent to each other, into which exactly two wire ends (44) of an electrical bevel are respectively engaged, wherein the electrical bevel is formed in particular by a plurality of uninterrupted, completely wound single-tooth coils (40).

14. An electric machine (12) having a stator (10) according to any one of claims 1 to 13, wherein: A rotor (31) is arranged in the stator (10), which can be driven by the stator (10), and the terminal device (54) is connected to the control electronics (20) via the connecting pins (58), the single-tooth coil (40) can be electronically commutated by means of the control electronics, and the stator (10) is assembled from individual T-shaped stator segments (22), the stator teeth (26) of which are wound in the separated state of the stator segments (22).

15. Method for producing a stator (10), in particular according to any one of the preceding claims, characterized in that The following method steps: - winding the stator teeth (26) with single-tooth coils (40), wherein at least two single-tooth coils (40) are completely wound with the aid of an uninterrupted connecting wire (42), - fastening the conductor element (56) to the annular disk (53) of the terminal device (58), - axially placing the terminal device (54) onto the wound stator base body (13) in such a way that the wire ends (44) of the single-tooth coils (40) projecting axially upwards protrude through the through-openings (65) of the annular disk (53) and the through-holes (46) of the conductor elements (56) and, in particular, project axially over the end faces (81) above the circumferential region (45) of the through-holes (46), - welding the wire end (44) to the upper end side (81) of the circumferential region (45), so that the wire end (44) is remelted to form a weld point (88).

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