Stator for an electric machine, electric machine and method for manufacturing such a stator

Abstract

The invention relates to a stator (10), an electric machine (9) and a method for producing a stator (10) having radial stator teeth (14) for accommodating an electrical winding (20), wherein the electrical winding (20) is connected with a coupling plate (52) by means of a crimping element (70), wherein an axially open accommodating recess (46) is configured on the stator (10), into which accommodating recess a winding wire (22) of the electrical winding (20) is placed, wherein the crimping element (70) is pressed into the accommodating recess (46) in order to electrically contact the winding wire (22), wherein the crimping element (70) is fixed in the accommodating recess (46) in a form-locking manner with respect to the axial direction (8) after its complete axial pressing in.

Description

Technical Field

[0001] The present invention relates to a stator for an electric motor according to the type of independent claim, and to an electric motor according to the type of independent claim and a method for manufacturing such a stator according to the type of independent claim. Background Technology

[0002] According to DE 10 2012 224 153 A1, a stator for an electric motor is known, wherein insulating laminations, a carrier plate, and a connecting plate are arranged axially on a lamination assembly. The stator is wound, for example, by means of pin winding, wherein individual sub-coils are interconnected on the outer circumference of the carrier plate by means of connecting wires. Here, the entire winding is integrally and continuously wound by means of a single winding wire. Because the connecting wires between the individual coils are arranged overlapping axially, the axial structural height of the stator is relatively large. Furthermore, the cost of welding the connecting plate to the connecting wires is very high.

[0003] DE 10 2008 054 529 A1 illustrates a stator for an electric motor, which consists of pre-wound single segments. Here, the wire ends of a single-tooth coil are inserted into receiving recesses for clip-on connections. There is a risk that after pressing multiple clip-on elements into the receiving recesses, these clip-on elements may move relative to the inserted wire during further assembly of the bearing cover and when contacting the electronic unit, thereby loosening their electrical contact. These disadvantages should be eliminated by the solution according to the invention. Summary of the Invention

[0004] In contrast, the device and method according to the invention, having the features of the independent claims, have the advantage of achieving a durable and reliable clip-on connection through a locking or clamping connection that securely fixes the clip-on element in the receiving recess by means of a locking element. The locking connection, having an axial undercut, prevents the clip-on element from potentially detaching from the wire inserted into the receiving recess. Here, an axial form-lock is formed for the clip-on element, preventing it from moving axially out of the receiving recess or relative to the wound wire. This form-locking connection between the clip-on element and the receiving recess thus ensures that it will not loosen during further assembly of the electric motor components and throughout the entire service life of the electric motor.

[0005] Advantageous improvements and refinements to the embodiments pre-given in the independent claims can be achieved through the measures listed in the dependent claims. Particularly advantageous is the use of a clip element for locking the connection, the clip element being arranged on the open edge of the receiving recess. The clip element extends axially in a tongue-like manner and is integrally hinged to the carrier plate on the open edge. The tongue-like clip element can be spring-loaded to one side during insertion of the clip-on element and springs back again after the clip-on element is fully inserted to form a locking connection. Thus, the tongue-like clip element forms an axial stop for securing the clip-on element, which reliably prevents the clip-on element from being pulled out of the receiving recess.

[0006] In a preferred embodiment, the clipping element has at least one clamping shoulder that serves as an axial abutment surface for a free tongue on the open edge of the receiving recess, thereby preventing the clamping shoulder from returning to its original position in the reverse of the pressing direction. Particularly advantageously, the clamping shoulder is arranged axially opposite to the cutting fork (Schneidegabel) of the clipping element on one hand, and adjacent to the connecting web of the clipping element on the other hand in the circumferential direction.

[0007] The ausformed recess is formed in a carrier plate, which is axially positioned on a metal stator core. The carrier plate insulates the stator teeth relative to the coils wound thereon. In the annular region outside the carrier plate, the ausformed recess is preferably constructed as an axial recess formed during injection molding. Here, the plastic material of the carrier plate is particularly well-suited for forming free tongues or movable areas with openings for clamping elements. The free tongues are preferably formed on the radially wide side of the ausformed recess at the open edge, so that the free tongues extend obliquely toward the tangential center of the ausformed recess in the locking position, and particularly directly abut against the clamping shoulder in the axial direction.

[0008] A connecting web connects the clip-on element to the electrical conductor element, which in turn connects the clip-on element to the connecting plate. Preferably, the clip-on element and the conductor element are integrally constructed, for example, as a stamped and bent piece. This eliminates the need for additional process steps in the construction of the press-fit surface for pressing the clip-on element into the receiving recess. During press-fitting, the cut edges cut into the wound wire placed in the receiving recess, thereby forming reliable electrical contact of the winding.

[0009] Because the clip-on element is held in the receiving recess by the clamping element, it is unnecessary to construct a locking element on the tangential outer edge of the cutting fork-shaped member, which cuts into the inner wall of the receiving recess. This significantly reduces the pressing force required for the clip-on element, thus requiring less force on the connection between the stator and the stator housing. In this embodiment, the tangential outer edge is then arranged to be spaced apart from the wide side of the receiving recess, wherein the cutting fork-shaped member is positioned on the bottom of the receiving recess via a centering element.

[0010] In another embodiment, clipping or locking elements are formed directly on the clipping element, and these clipping or locking elements are embedded in corresponding recesses within the receiving recess. Here, the cut-out recesses are formed on movable areas of the receiving recesses, and are elastically compressed to one side when the clipping element is axially inserted in the circumferential direction. After the clipping element is fully inserted, the movable area with the recesses springs back, causing the clipping or locking elements formed on the clipping element to be embedded in the recesses in a shape-locking manner.

[0011] The clip or locking element is particularly configured as an axially free tab that extends axially beyond the cutting fork-shaped member, and can also be configured to move elastically within certain limits in the circumferential direction. Therefore, the elastically configured free tab can also be spring-loaded and form-locked into the fixed-positioned recess of the receiving recess to a certain extent.

[0012] Particularly advantageously, a locking hook is punched at the free end of the tab, which forms an axial form-lock with the opening of the receiving recess. In a first embodiment, the tips of the locking hooks are oriented toward the radially wide side of the receiving recess, away from each other. Here, the receiving recess is cut out in the radially wide side of the receiving recess, so that the movable areas preferably extend toward each other in the circumferential direction away from the wide side of the receiving recess, wherein the axially free ends of the movable areas axially and form-lock abut against the clamping element or locking element. In a second embodiment, the tips of the locking hooks are oriented toward each other toward a tangentially centrally fixed region. Here, the receiving recess is cut out in the tangentially centrally fixed region, so that the movable areas extend away from the tangentially centrally fixed region, preferably circumferentially away from each other, wherein the clamping element or locking element axially and form-lock abuts against the opening.

[0013] The movable area of ​​the receiving recess can be cost-effectively manufactured by forming axial slots that extend along the wide side of the receiving recess. These axial slots are either directly behind the inner wall of the receiving recess or positioned in the middle of a tangentially oriented fixed area. This allows for the free cutting of relatively thin axial webs as the movable area, which are constructed to be elastically movable in the circumferential direction. Lofts are cut into these axial webs, which spring back during insertion of the clip-on element after the axial webs spring back, so as to form a form-locking engagement with the clipping or locking elements of the clip-on element.

[0014] In a preferred embodiment, the clip-on element can be directly connected to a connection pin, which is a conductor element, via a connecting web. This connection pin can be directly embedded in the electronic circuit board, for example. In this embodiment, printed conductors are constructed on the electronic circuit board, and these conductors electrically contact the connection pins of the clip-on element on the electronic circuit board. Advantageously, the connection pins can be constructed as press-fit contacts with eyelets, which are pressed together when pressed into corresponding contact openings on the circuit board. This electrical contact eliminates the need for additional connection processes such as brazing or soldering.

[0015] Alternatively, the electrical conductor element is stamped as a ring-shaped conductor strip, and one or more clip-on elements are formed on the ring-shaped conductor strip. The conductor element is arranged on a connecting plate, which is axially joined to a carrier plate, for example, together with the clip-on elements, wherein the clip-on elements are electrically inserted into receiving recesses. Here, the conductor element is connected to the connecting plate, for example, by means of locking elements, ultrasonic stamping, hot air riveting, or hot stamping.

[0016] The carrier plate is preferably designed as an insulating mask with a plastic ring, from which the stator teeth are covered, extending radially inward. In a preferred embodiment, insulating masks are arranged on both axial end sides of the stator core, wherein, particularly on only one end side (=carrier plate), a receiving recess for the clip-on element is constructed. Here, not only the stator core plates are stacked, but the two insulating masks each form a closed ring. Because the carrier plate is manufactured particularly simply by plastic injection molding, the free tongue or movable area with a gap is formed together with the receiving recess in the same process. By constructing a thin plastic bridge / web, it is very advantageous to form the elastically resilient area or element in the receiving recess.

[0017] According to the invention, the clip-on connection allows for the continuous winding of the entire stator or its components using uninterrupted winding wire. Thus, for example, a single-tooth coil is arranged on each stator tooth, and these single-tooth coils are interconnected by connecting wires. The connecting wires are guided radially through receiving recesses and radially outward to the next stator tooth. Thus, the connecting wires between every two single-tooth coils can contact each other using clip-on elements. Therefore, the single-tooth coils can be arbitrarily interconnected based on the connecting plate, independent of the winding process, and the coils can be arbitrarily interconnected based on the design of their conductor elements.

[0018] Particularly advantageously, the winding wire can be wound between individual coils along a guide element constructed on the outer circumference of a carrier plate. Here, grooves can be constructed circumferentially to prevent axial contact of the winding wire. To provide sufficient axial structural space for clamping connections, receiving recesses are formed on axial protrusions that extend axially beyond the guide element. Here, for example, free tongues extending axially from the open edge into the receiving recesses are axially arranged completely above the guide element, and therefore preferably also completely above the connecting wire of the individual coils.

[0019] The stator according to the invention is particularly suitable for manufacturing electric motors, such as electric motors, wherein the rotor is arranged radially inside the stator as an inner rotor. Here, the stator coils are controlled by electronic units to rotate the rotor. The stator is, for example, pressed into a motor housing, in which control electronics for the motor are also arranged above the rotor. Such an EC motor is preferably used in motor vehicles to drive pumps or blowers, for linear adjustment of components, or as a traction drive.

[0020] The stator, manufactured according to the invention, can produce a highly reliable clip-on connection, which also reliably generates a high pull-out force for the clip-on element. By constructing a clip connection between the clip-on element and a movable element receiving a recess, an axially strong axial form-locking is achieved directly by inserting the clip-on element, which ensures reliable electrical contact of the wound wire during further assembly of the motor and throughout its service life. Attached Figure Description

[0021] Embodiments of the present invention are shown in the accompanying drawings and further described below. Wherein are shown:

[0022] Figure 1 A first embodiment of the stator according to the present invention is shown.

[0023] Figures 2 to 4Detailed diagrams are shown of a variation of the clip-on element fixed according to the present invention. Detailed Implementation

[0024] exist Figure 1A portion of a stator 10 is shown, having a closed magnetic yoke ring 38 along a circumferential direction 9. Radial stator teeth 14 are formed on this yoke ring to accommodate an electrical winding 20. In this embodiment, the stator teeth 14 are radially inwardly oriented, such that a rotor (not shown) can be supported within the stator teeth 14, which is driven by the stator 10 as an internal rotor. The stator 10 consists of individual laminations 36 stacked on top of each other in the axial direction 8 and connected to form a common lamination assembly. These laminations 36 are preferably stamped, so that the stator teeth 14 are integrally constructed with the magnetic yoke ring 38. A carrier plate 40 is arranged on a first axial end 39 of the lamination assembly, preferably completely covered by an insulating material as an insulating mask. Preferably, the carrier plate 40 is constructed as a plastic injection molded part, which is axially fitted onto the lamination assembly. The lamination assembly and the carrier plate 40 together form a stator base 34. The carrier plate 40 has a closed circumference 41 on its radially outer side, on which a guide element 44 is formed, guiding the connecting wire 30 of the wound wire 22 between the individual coils 17. Therefore, the carrier plate 40 is the carrier of the electrical winding 20. The wound wire 22 is guided outward from the wound single-tooth coil 17 in the radial direction 7 so that the guide element 44 is guided radially outward in the circumferential direction 9. A receiving recess 46 is constructed on the closed circumference 41 of the carrier plate 40 into which the wound wire 22 is placed for connection with the clip-on element 70. The receiving recess 46 has a dimension 49 in the circumferential direction 9 that is larger than its dimension 50 in the radial direction 7. Preferably, all receiving recesses 46 are arranged on the same radius about the stator axis. The receiving recess 46 is preferably arranged in the region of the stator slot 16 between the stator teeth 14, into which the connecting wire 30 between the single-tooth coils 17 is placed, wherein additional receiving recesses 46 may be arranged for the starting point and end point of the winding wire. In an alternative embodiment, two or more single-tooth coils 17 have a common receiving recess 46. A connecting plate 52 is arranged axially above the wound carrier plate 40, by means of which the single-tooth coils 17 are energized. The clip-on element 70 is arranged on the electrical conductor element 54, which is electrically insulated from the connecting plate 52. The conductor element 54 is constructed as a stamped and bent piece on which the clip-on element 70 is integrally formed. The conductor element 54 has an annular region 57 extending in a radial plane transverse to the stator axis. Preferably, the clip-on elements 70 are shaped such that all clip-on elements 70 extend in the radially outer region toward the receiving recess 46 in the axial direction 8. The clip-on elements 70 have a width 74 in the circumferential direction 9 that is greater than their thickness 75 in the radial direction 7.On the clip-on element 70, a cutting fork-shaped member 72 is centered about the circumferential direction 9. This cutting fork-shaped member moves on the wound wire 22 within the receiving recess 46 during axial engagement. This constitutes a conductive clip-on connection. The clip-on element 70 is pressed into the receiving recess 46 such that it is centered about the circumferential direction 9 about the wound wire 22. Furthermore, about the radial direction 7, an auxiliary member 43 is constructed on the inner surface 47 of the receiving recess 46 to precisely position the clip-on element 70.

[0025] To prevent the clipping element 70 from dislodging from the receiving recess 46, clamping elements 80 are formed on its open edges 48, forming an axial shape lock with the clipping element 70. In this case, the clamping elements 80 are arranged as free tongues 81 on the two wide sides 49 of the receiving recess 46, and their free ends axially abut against the clipping element 70. Therefore, the clipping element 70 can no longer be pulled out of the receiving recess in the reverse pressing direction. This embodiment... Figure 2 A more detailed description is provided below.

[0026] Conductor element 54 in Figure 1 The conductor element 54 is connected to the connecting plate 52 adjacent to the clip-on element 70 at its radially outer end by means of material deformation. For this purpose, a stamped pin 64 of the connecting plate 54 passes through a punched hole 65 in the conductor element 54, wherein the free end 66 of the stamped pin 64 is deformed into a stamped head 67, particularly by means of ultrasonic stamping, hot air riveting, or hot stamping. Thus, the conductor element 54 is firmly and immovably fixed to the connecting plate 54 in the radially outer region. A contact module 60 is arranged at the end of the conductor element 54 opposite to the clip-on element 70, which is not directly connected to the connecting plate 52. The contact module 60, for example, has a plug flange 61 for accommodating one or more plug tabs of the corresponding electronic unit. Here, the end of the conductor element 54 is, for example, injection-molded into or clamped into the contact module 60.

[0027] Figure 2Another embodiment is shown, illustrating enlarged details of the inserted clip-on element 70. A cutting fork-shaped member 72 is constructed on the clip-on element 70, having a slit for receiving the wound wire 22. A cutting edge 73 is constructed on the inner side of the cutting fork-shaped member 72, which penetrates the insulating varnish of the wound wire 22 and embeds itself into the wound wire 22 when pushed onto it to form an electrical contact. The clip-on element 70 is fully embedded in the receiving recess 46, which has a dimension 49 larger in the circumferential direction 9 than its dimension 50 in the radial direction 7. The wound wire 22 extends radially through the receiving recess 46. Here, the wound wire 22 is placed on a contact surface 23, against which it is pressed when the clip-on element 70 is axially inserted. In the circumferential direction 9, an inclined surface 77 is arranged on the outer side 89 of the clipping element 70, the inclined surface being constructed as a smooth surface of the width 74 of the clipping element 70. Here, no locking element is constructed on the inclined surface 77, which can be embedded in the inner surface 47 of the receiving recess 46. To center the clipping element 70, a centering pin 55 is constructed in the receiving recess 46, the centering pin being axially embedded in the gap between the two cutting edges 73, so as to position the clipping element 70 about the circumferential direction 9.

[0028] The clip-on element 70 is secured here by clipping elements 80 formed on the receiving recess 46. The receiving recess 46 is preferably injection-molded in the carrier plate 40. Here, the clipping element 80 is formed as a free tongue 81 on the axially open edge 48 together with the carrier plate 40, the tongue extending axially into the receiving recess 46 with a free end 91. The free tongue 81 is arranged, for example, obliquely toward the clip-on element 70. When the clip-on element 70 is axially inserted, the free tongue 81 is elastically compressed in the circumferential direction 9, such that it extends, in particular, generally parallel to, the inner surface 47 of the receiving recess 46. Once the clip-on element 70 is fully inserted into the receiving recess 46, the free tongue 81 elastically springs back to its initial position and locks with the clip-on element 70. Here, the free end 91 of the free tongue 81 axially abuts against the clamping shoulder 76 of the clip-on element 70, thereby preventing the clip-on element 70 from moving out of the receiving recess 46 again in the reverse pressing direction. Here, when attempting to pull the clip-on element 70 out of the receiving recess 46 with axial tension, the free end 91 of the free tongue 81 acts as a fixed axial stop, and the clamping shoulder 76 presses against this axial stop.

[0029] Between the clamping shoulders 76, a connecting web 78 is mounted on the clip-on element 70, by means of which the clip-on element 70 is axially connected to an electrical conductor element 54, which makes the clip-on element 70 electrically contact the connecting plate 52. In this embodiment, the conductor element 54 is configured as a pin 53, which can be directly inserted, for example, into a corresponding opening in the circuit board 56, which is configured as the connecting plate 52. Optionally, the pin 53 may have a press-in eyelet 51. To press the clip-on element 70 into the receiving recess 46, a press-in surface 79 is formed on the connecting web 78, and during pressing, a press-in tool axially abuts against the press-in surface. The receiving recess 46 is here configured on an axial protrusion 88 of the carrier plate 40, which axially protrudes beyond the guide element 44 of the carrier plate 40. This creates an axial structural space for arranging the clamping element on the axially open edge 48. Figure 2 As can be seen, the connecting wire 30 is guided in the circumferential direction 9 between the single-tooth coils 17 on the guiding element 44. The guiding element 44 is here constructed as a groove along the circumferential direction 9, into which the wound wire 22 is placed.

[0030] exist Figure 3 Another embodiment is shown, wherein the clipping element 70 is held in the receiving recess 46 by means of a clip connection. Here, on the clipping element 70, a free tab 82 is formed as a clipping element 80 on the cutting fork-shaped member 72. Preferably, the free tab 82 extends axially beyond the lower end of the cutting edge 73 as an extension of the tangential outer edge 89. Locking hooks 90 are respectively constructed on the axial lower ends of the free tabs 82, the tips 92 of which extend away from each other toward the sidewall 45 of the receiving recess 46. In the receiving recess 46, a clearance 83 is constructed in the movable area 85 of the receiving recess 46. For this purpose, in Figure 3An axial slit 86 is formed in the center, extending along the side 45 to the rear of the movable area 85. Through the cavity formed by the axial slit 86, the area 85 with a cutout 83 can be elastically bent, allowing the locking hook 90 to slide axially on the elastic area 85 to engage with the cutout 83. In this embodiment, the cutout 83 is constructed as axially downward-opening stops 94, forming an axial undercut with the locking hook 90. ​​Thus, the locking hook 90 forms an axial shape lock with the receiving recess 46, preventing the clamping element 70 from undesirably dislodging from the receiving recess 46. Preferably, the free tab 82 with the locking hook 90 is integrally constructed with the clamping element 70 as a stamped bent piece made of sheet metal. Here, a pressing surface 79 for pressing in a tool is constructed in the area connecting the web 78. Optionally, a centering pin 55 is constructed centered in the circumferential direction, which is axially embedded in the gap between the two cutting edges 73 to position the clip-on element 70 about the circumferential direction 9. A clip connection axially and securely holds the clip-on element 70 in the receiving recess 46. To position the clip-on element 70 about the radial direction 7, clamping ribs 35 are constructed along the circumferential direction 9 on the inner surface 47 of the receiving recess 46, particularly on its long side 49. Preferably, the receiving recess 46 is formed in the carrier plate 40 by plastic injection molding. Here, a slider is introduced into the injection molding tool along the axial direction 8, the slider not only leaving free space for receiving the clip-on element 70, but also leaving a gap 86 for the movable area 85 and a clearance 83 in the carrier plate 40. Here, the movable area 85 is preferably hingedly connected to the sidewall 45 of the receiving recess 46.

[0031] According to a variation of this embodiment, the free tabs 82 can be configured to spring back about the circumferential direction 9 (tangential to the stator 10). When the clip-on element 70 is axially inserted into the receiving recess 46, the two free tabs 82 elastically press against each other, wherein the tip 92 of the locking hook 90 slides axially along the sidewall 45 of the receiving recess 46. Once the clip-on element 70 is fully inserted into the receiving recess 46, the elastic locking hook 90 is re-locked back to its initial position by engaging with the recess 83 constructed on the sidewall 45 of the receiving recess 46.

[0032] exist Figure 4Another embodiment is shown, in which the tips 92 of the locking hooks 90 are oriented toward each other about the center of the receiving recess 46 in the circumferential direction 9 on the free tabs 82. Here, the gaps 83 are not constructed on the sidewalls 45, but on the tangentially central fixed region 96. An axial gap 86 is constructed in the middle of the central fixed region 96, which allows elastic deformation of the central fixed region 96 such that when the locking hooks 90 slide along the axial direction 8 on the central fixed region 96, the gaps 83 cut out in their movable regions 85 spring back toward each other. Once the clip-on element 70 is fully inserted, the elastically movable regions 85 of the central fixed region 96 spring back toward each other again in the circumferential direction 9, thereby the tips 92 of the locking hooks 90 engage with the gaps 83 in the central fixed region 96 and form an axial shape lock. Here, axial stops 94 are also constructed on the open portion 83, forming an axial undercut portion with a locking hook 90. ​​The intermediate fixing region 96 can be reconstructed as a centering pin 55, on which the cutting fork 72 is centered during insertion.

[0033] In a variation of this embodiment, the free tabs 82 are configured to spring back in the circumferential direction 9. Here, when the clip-on element 70 is axially inserted into the receiving recess 46, the two free tabs 82 are elastically pressed apart upon reaching the intermediate fixed region 96, where the tip 92 of the locking hook 90 slides along the intermediate fixed region 96 in the axial direction 8. Once the clip-on element 70 is fully inserted into the receiving recess 46, the locking hook 90 springs back to its initial position and locks itself in place by engaging with the recess 83 constructed in the intermediate fixed region 96 of the receiving recess 46. Thus, the locking hook 90 forms an axial shape-lock with the tangentially intermediate fixed region 96 of the receiving recess 46, preventing the clip-on element 70 from undesirably dislodging from the receiving recess 46. This ensures that the electric winding 20 reliably maintains electrical contact via the clip-on connection during the assembly of the electric motor 9 and throughout its entire service life.

[0034] It should be noted that, regarding the embodiments shown in the accompanying drawings and the specification, a wide variety of possible combinations of individual features are possible. Thus, for example, the specific construction, arrangement, and number of the receiving recess 46 can be varied. Similarly, the specific position and structure of the clip-on element 70 and its cutting edge 73 can be matched to the requirements and manufacturing possibilities of the motor. Different wiring of individual phases of the electrical winding 20 can be achieved in the corresponding connecting plates 52 by means of different conductor elements 54. The design and size of the clip element 80 and its corresponding movable area 85 or its clearance 83 can be matched to the resulting pressing and pulling forces. This invention is particularly suitable for the rotational drive of components or the adjustment of parts in motor vehicles, and is applicable to electric traction drives, but is not limited to these applications.

Claims

1. A stator (10) for an electric motor having radial stator teeth (14) for receiving an electric winding (20), wherein, The electrical winding (20) is connected to the connecting plate (52) by means of a clip-on element (70), wherein an axially open receiving recess (46) is constructed on the stator (10), into which the wound wire (22) of the electrical winding (20) is inserted, wherein the clip-on element (70) is pressed into the receiving recess (46) to make electrical contact with the wound wire (22), wherein the clip-on element (70) is fixed in the receiving recess (46) by means of a clamp connection in a form-locking manner about the axial direction (8) after it is fully pressed in axially. A clipping element (80) is integrally formed on the axially open edge (48) of the receiving recess (46). The clipping element extends as a free tongue (81) in the axial direction (8) and is configured to move elastically in the axial direction (8). After the clipping element (70) is fully inserted into the receiving recess (46), it forms an axial shape lock with the clipping element (70).

2. The stator (10) according to claim 1, characterized in that, The clip-on element (70) has a pressing shoulder (76) extending transversely to the axial pressing direction, wherein the clamping element (80) axially directly abuts the pressing shoulder (76) after the clip-on element (70) is fully inserted, wherein the clamping element (80) extends obliquely to the axial direction (8) in its locking position.

3. The stator (10) according to claim 1 or 2, characterized in that, The receiving recess (46) has a longer side (49) in the circumferential direction (9) than the wider side (50) in the radial direction (7), and the clamping element (80) is formed on the two wider sides (50) and is movable in the circumferential direction (9).

4. The stator (10) according to claim 2, characterized in that, The clip-on element (70) has a cutting fork (72) having an internal cutting edge (73) formed thereon, the internal cutting edge cutting into the wound wire (22) and forming a connecting web (78) with the electrical conductor element (54) on the clip-on element (70) opposite to the cutting fork (72) in the pressing direction, wherein the pressing shoulder (76) extends toward the connecting web (78) on both sides.

5. The stator (10) according to claim 4, characterized in that, An external guide bevel (77) is formed on the cutting fork (72), the guide bevel having a smooth, flat surface and without a locking hook.

6. The stator (10) according to claim 4, characterized in that, A clipping element (80) is integrally formed on the clipping element (70), the clipping element extending as a free tab (82) in the axial direction (8) beyond the cut edge (73) and forming an axial shape lock with the empty portion (83) cut out in the receiving recess (46).

7. The stator (10) according to claim 6, characterized in that, The free tab (82) is configured to move elastically transversely to the axial direction (8).

8. The stator (10) according to claim 6, characterized in that, A locking hook (84) is formed on the end of the free tab (82), and the locking hook extends in two directions along the circumferential direction (9) toward the tangential center of the receiving recess (46) or in two directions away from each other toward the sidewall (45) of the receiving recess (46).

9. The stator (10) according to any one of claims 1 to 8, characterized in that, The cut-out blank (83) is arranged on the area (85) of the receiving recess (46) that is movable in the circumferential direction (9), wherein the movable area (85) is elastically constructed in the circumferential direction (9) through an axial gap (86).

10. The stator (10) according to claim 4, characterized in that, A connecting pin (53) is constructed on the connecting web (78) opposite the cutting fork-shaped member (72) as an electrical conductor element (54), the connecting pin being directly inserted into an electronic circuit board (56) constructed as a connecting plate (52), or the electrical conductor element (54) is constructed as a circular curved stamp (57) on which at least one additional clip-on element (70) is formed.

11. The stator (10) according to any one of claims 1 to 8, characterized in that, The stator (10) consists of a single axially stacked plate lamination (36) and has at least one carrier plate (40) made of plastic for insulating the electrical winding (20), wherein the receiving recess (46) is constructed in the carrier plate (40), and a clamping element (80) constructed as a free tab (82) or a cut-out opening (83) is formed in the plastic of the carrier plate (40).

12. The stator (10) according to claim 11, characterized in that, The carrier plate (40) has a closed circumferential ring (41), and radially covered portions (15) of the radial stator teeth (14) extend from the circumferential ring, wherein the receiving recess (46) is arranged in the region of the circumferential ring (41). Furthermore, the single-tooth coil (17) of the electrical winding (20) is wound onto at least two adjacent stator teeth (14) using uninterrupted winding wire (22), thereby providing a continuous connecting wire (30) between at least two of the single-tooth coils (17), the connecting wire being laid through at least one receiving recess (46) so as to contact the individual single-tooth coil (17) by means of the clip element (70).

13. The stator (10) according to claim 12, characterized in that, A guide element (44) for the connecting wire (30) is constructed along the circumferential direction (9) on the radially outer circumferential ring (41) of the carrier plate (40), and the axially open edge (48) of the receiving recess (46) is constructed on the axial protrusion (88) of the carrier plate (40), the protrusion protruding axially beyond the guide element (44).

14. An electric motor having a stator (10) according to any one of claims 1 to 13, characterized in that, The stator (10) is inserted into the motor housing (12), wherein the rotor is supported inside the stator (10) by a bearing cover in the motor housing (12), and the electronic unit for controlling the electric winding (20) is axially arranged above the connecting plate (52) and in electrical contact with the connecting plate.

15. A method for manufacturing a stator (10) according to any one of claims 1 to 13, characterized in that... The following are the steps: - The electrical winding (20) is wound onto the stator base (34) having at least one carrier plate (40) by means of a winding wire (22), wherein after winding a single stator tooth (14), the winding wire (22) is radially guided through the receiving recess (46). - The clip-on element (70) is axially pressed into the receiving recess (46), wherein the clip-on element (80) and / or the movable region (85) having the cut-out opening (83) deflects along the circumferential direction (9). - After the clip-on element (70) is fully inserted into the receiving recess (46), the clip-on element (80) locks with the clip-on element (70) and / or the cut-out recess (83) to form an axial shape lock.

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