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

Abstract

The invention relates to a stator (10), an electric motor (9), and a method for producing a stator (10), the stator having a stator base body (34) with radial stator teeth (14) for accommodating an electric winding (20), wherein the electric winding (20) is connected to a wiring board (52) by means of at least one knife-type clamping element (70), wherein at least one accommodating pocket (46) is formed on the stator base body (34), into which a winding wire (22) of the electric winding (20) is inserted, wherein the knife-type clamping element (70) is embedded in the accommodating pocket (46), and in the accommodating pocket (46) a compression rib (25) is arranged, which clamps the embedded knife-type clamping element (70) in a fixed position with respect to the extension direction (26) of the inserted winding wire (22).

Description

Technical Field

[0001] The invention relates to a stator for an electric machine as well as to an electric machine and a method for producing such a stator. Background Art

[0002] DE 10 2012 224 153 A1 discloses a stator for an electric motor, in which insulating sheets, support plates and connecting plates are arranged axially on a laminated core. The stator is wound, for example, by means of a pin winding, wherein the individual sub-coils are connected to one another by means of connecting wires on the outer circumference of the support plate. Here, the entire winding is completely wound in one piece by means of a single winding wire. Since the connecting wires between the individual coils are arranged axially one above the other, the axial construction height of the stator is relatively large. In addition, the costs for welding the connecting plates to the connecting wires are extremely expensive.

[0003] DE 10 2008 054 529 A1 shows a stator for an electric motor, which is assembled from pre-wound individual segments. Here, the wire ends of the single-tooth coils are inserted into receiving pockets for knife-type clamping connections. After a plurality of knife-type clamping elements are pressed into the receiving pockets, there is the risk that, during the further installation of the bearing cover and during the contacting of the electronics unit, the knife-type clamping elements will move relative to the inserted wires and thereby release their electrical contact. These disadvantages are intended to be eliminated by the technical solution according to the invention. Summary of the invention

[0004] In contrast, the device according to the invention and the method according to the invention have the advantage that the knife clamping element is reliably prevented from relative movement of the inserted winding wire by forming a compression rib on the planar inner side of the receiving pocket. Here, the knife clamping element is fastened in the receiving pocket by a latch hook on its side edge. With respect to the extension in the direction of the sheet thickness of the knife clamping element, this knife clamping element is reliably prevented from leaving a gap along the sheet thickness by an additional compression rib. The knife clamping element is thus reliably compressed with the inner side of the receiving pocket in all directions transversely to the pressing direction in a plane. The return movement of the knife clamping element against the pressing direction is prevented by the shape fit of the latch hook. Reliable electrical contact is thus achieved, which cannot be released even under the effect of additional forces when installing other components or during the service life of the motor. Another advantage is that the compression rib closes the gap between the knife clamping element and the receiving pocket in other areas. As a result, copper particles generated when cutting the wire can hardly enter the sensitive electronic device area and instead remain in the receiving pocket.

[0005] The measures listed in the preferred embodiment achieve advantageous expansions and improvements of the embodiments provided in the invention. For inserting the winding wire, the receiving pocket has a slot, at the bottom of which a contact surface for the winding wire is formed. The winding wire extends along the contact surface through the entire thickness of the receiving pocket. In this case, the thickness is substantially smaller than the width of the receiving pocket, which extends transversely to the inserted winding wire. With regard to the thickness of the receiving pocket, opposing compression ribs are advantageously formed on both sides on the inner surface of the receiving pocket, so that the inserted knife-type clamping element is firmly braced relative to the thickness of the receiving pocket by the opposing compression ribs.

[0006] In a preferred embodiment, two separate compression ribs are formed on the inner side of the receiving pocket along the width of the receiving pocket, which are separated from each other by a contact surface for the winding wire arranged between them. As a result, the knife-like clamping element is clamped evenly on both knife-like arms in the receiving pocket, thereby preventing the knife-like clamping element from tilting.

[0007] In order to press the blade clamping element into the receiving pocket, a pressing collar is formed on the blade clamping element, which preferably extends through the thickness of the receiving pocket. A pressing die can be directly placed on the pressing collar, which is preferably arranged symmetrically to the connecting tab of the blade clamping element toward the conductor element, and the pressing die presses the blade clamping element completely into the receiving pocket in the pressing direction. During the pressing, the knife fork is moved by the inserted winding wire, so that the knife edge is embedded in the surface of the winding wire at the inner edge of the blade arm.

[0008] In a preferred embodiment, the pressing rib is formed in the axial lower part of the receiving pocket. The pressing rib extends, for example, from the bottom of the receiving pocket in the opposite direction of the pressing-in direction along the knife arms to the region of the cutting contact with the winding wire. As a result, the two knife forks are advantageously tensioned between two opposing caulking ribs substantially over their entire axial length. Here, the knife clamping element can be centered and pressed in with relatively little force in the axial upper half of the receiving pocket, while the pressing force is gradually increased in the lower half of the receiving pocket by the pressing rib formed therein, in order to firmly press the knife clamping element.

[0009] In order to achieve a material deformation of the squeeze rib, which is preferably made of the same plastic material as the entire receiving pocket, the squeeze rib has a variable cross section with respect to the width of the receiving pocket. It is particularly advantageous if the cross section is thicker in the center of the caulking rib along the width of the receiving pocket than in two adjacent edge regions of the squeeze rib. The material can thus be deformed in the thicker central region of the squeeze rib towards the two edge regions of the squeeze rib when the knife-type clamping element is pressed in, so as to produce a planar squeeze with the knife-type clamping element. The cross section is, for example, an arched structure, but the cross section can also have a plurality of flat sections that form an angle with each other.

[0010] In a preferred embodiment, four mutually separated squeezing ribs are formed in the receiving pocket on the inner side of the receiving pocket. These squeezing ribs can be formed particularly easily in the receiving pocket during the production of the insulating sheet by means of an injection molding process. Since the blade-type clamping element has two free blade arms, two squeezing ribs are arranged opposite each other on the two free blade arms in the receiving pocket with respect to the thickness of the receiving pocket. With respect to the width of the receiving pocket, the squeezing ribs are each separated from each other by a continuous slot for receiving the winding wire in the receiving pocket.

[0011] In order to prevent the knife-type clamping element from moving against the direction of pressing in, the latching hook forms an undercut with the receiving pocket. The latching hook is formed on the opposite side edges of the knife-type clamping element and is pressed into the receiving pocket with a corresponding laterally opposite interference in order to form a positive fit with the receiving pocket. Preferably, two latching hooks are formed on each side edge of the knife-type clamping element, which latching hooks can have different sizes, for example. However, variants are also possible in which more than two latching hooks are formed on each side in the form of a Christmas tree geometry.

[0012] In order to improve the pressing of the blade clamping element in the lowermost region of the receiving pocket, wedge-shaped regions are formed on the two free blade arms at their outer side edges, which intersect at corresponding slopes of the receiving pocket. The two free arms are thus pressed against each other or against the winding wire arranged between them. This improves the cutting contact of the blade edge into the winding wire and at the same time reliably presses the free ends of the blade arms in the lower region of the receiving pocket in the direction of the width of the receiving pocket.

[0013] The knife-type clamping element is a component of an electric conductor element in a preferred embodiment, and the electric conductor element is arranged on a wiring board. The wiring board is used to energize the electric winding through the cut-in contacts connected by the knife-type clamping. Here, the knife-type clamping element is preferably constructed as a bent blanking part with the electric conductor element through the connecting tab. In an alternative embodiment, the electric conductor element can also be a component of a printed circuit board that forms a wiring board. In this embodiment, the knife-type clamping element is preferably connected to the printed circuit board by a pressed-in contact. Optionally, another second knife-type clamping element is constructed opposite to the knife-type clamping element, which is connected to the electric conductor element accordingly.

[0014] It is particularly advantageous if the receiving pocket is formed directly in the insulating cover of the stator. In this case, the base body of the stator preferably consists of individual laminates, on the axial end faces of which the insulating sheets are arranged. The insulating sheets are produced, for example, as injection-molded parts, wherein the receiving pocket and the extrusion ribs formed therein are formed integrally with the insulating sheets. The stator base body with the insulating sheets is preferably formed with a closed outer circumferential ring, in the region of which the receiving pocket is formed. However, the receiving pocket can alternatively also be formed in the insulating cover for the single-tooth segments, which are subsequently assembled to form an annular stator.

[0015] It is particularly advantageous for the winding process that at least two or more stator teeth are completely wound with an uninterrupted winding wire. In this case, the connecting wire between two individual tooth coils is placed in a receiving pocket of the insulating sheet, so that the individual individual tooth coils can contact each other at their connecting wires, so that any wiring of the individual individual tooth coils can be achieved. In this case, the width of the receiving pocket preferably extends in the tangential direction of the stator, so that the winding wire of the connecting wire can be placed radially outward through the receiving pocket in a particularly advantageous manner.

[0016] The stator according to the invention is particularly suitable for constructing an electric motor in which the rotor is radially accommodated in the stator. The stator is arranged in a motor housing, on which a bearing shield for the rotor is also formed. An electronic unit is preferably arranged above the wound stator, which controls the wiring board and the electrical coils connected thereto. The electric motor is preferably designed as an EC motor, wherein the stator has electronically commutated coils which drive the rotor together with the permanent magnets arranged in the rotor.

[0017] In the manufacturing method according to the invention, a plastic cover is placed on the core of the stator in order to insulate the winding wire from the iron body. A receiving pocket is already formed in the insulating cover, on the inner side of which a compression rib is formed. After the individual stator teeth have been wound, the winding wire is placed in the receiving pocket. Thereafter, the knife-type clamping element is pressed axially into the receiving pocket and is tensioned radially inside the receiving pocket without play between the compression ribs. The knife-type clamping element is preferably arranged directly on the wiring board, so that when the wiring board is axially placed on the stator base body, the knife-type clamping element is pressed into the corresponding receiving pocket of the insulating cover.

[0018] In another embodiment, a plastically deformable adhesive can be applied before the wiring board is set on the winding wire of each coil, and the adhesive is deformed accordingly due to the wiring board being set and forms a rigid fixed connection between the electric winding and the wiring board after it hardens. The advantage of doing this is that when force acts on the wiring board, for example, due to the installation of other components, the wiring board can no longer be deformed relative to the electric winding. This also prevents the introduction of force into the knife-type clamping element arranged in the receiving pocket. The receiving pocket preferably has a larger extension in the circumferential direction than in the radial direction. Here, the winding wire is guided from the first coil radially through the receiving pocket to the radial outer side of the stator and then radially inwardly guided to the next stator tooth in the adjacent recessed portion in the circumferential direction. Therefore, two adjacent coils are connected to each other on the radial outer side of the insulating sheet on the shortest path by the connecting section of the winding wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Exemplary embodiments of the invention are illustrated in the drawings and are explained in the following description.

[0020] In the figure:

[0021] Figure 1 A first embodiment of a stator according to the present invention is shown;

[0022] Figure 2a A sectional view of a knife-type clamping element fixed according to the present invention is shown;

[0023] Figure 2b Shows the Figure 2a a top view of a knife-type clamping element; and

[0024] Figure 3 A further embodiment of an electric machine according to the invention is shown. DETAILED DESCRIPTION

[0025] exist Figure 1, a stator 10 is shown, which has a grounding ring 38 closed in the circumferential direction 3, on which radial stator teeth 14 are formed for accommodating single-tooth coils 17 wound with winding wires 22. In this embodiment, the stator teeth 14 point radially inward, so that a rotor (not shown) can be supported in the stator teeth 14, and the rotor is driven by the stator 10 as an inner rotor. The stator 10 is composed of individual laminations, which are stacked one above the other in the axial direction 2 and connected to form a common lamination stack. The laminations are preferably punched out, so that the stator teeth 14 are integrally formed with the grounding ring 38. An insulating cover 40 is arranged on a first axial end side of the lamination stack, which preferably completely covers the end side with insulating material. The insulating cover 40 is configured as a plastic injection molded part, which is axially mounted on the lamination stack. The lamination stack and the insulating cover 40 together form the stator base body 34. The insulating cover 40 has a closed circumference 41 radially outward, on which a guide element is formed, which guides the connecting section 30 of the winding wire 22 between the individual coils 17. The winding wire 22 is guided outward in the radial direction 4 so as to be guided along the circumferential direction 3 on the radial outer side of the guide element. A receiving pocket 46 is constructed on the radially outer region of the insulating cover 40, into which the winding wire 22 is placed so as to be connected to the knife-type clamping element 70. The receiving pocket 46 has a larger size in the circumferential direction 3 than in the radial direction 4. All the receiving pockets 46 are preferably arranged on the same radius with respect to the stator axis. The receiving pockets 46 are preferably arranged in the region of the stator slots between the stator teeth 14. Here, a receiving pocket 46 is assigned to each stator tooth 14, wherein additional receiving pockets for the winding wire ends can be arranged. The wiring board 52 is arranged above the wound insulating cover 40, and the single-tooth coil 17 is controlled by means of the wiring board. For this purpose, an axially extending centering pin 80 is integrally formed on the insulating cover 40, and the centering pin is embedded in the corresponding centering receiving portion 81 in the wiring board 52. The centering receiving portion 81 is configured as an axial hole. When the wiring board 52 is axially spliced, the knife-type clamping element 70 arranged on the wiring board 52 is positioned exactly relative to the receiving pocket 46 and pressed into this receiving pocket along the pressing direction 12. After the centering pin 80 is completely introduced into the corresponding centering receiving portion 81 in the axial direction, the axial end area of ​​the centering pin 80 is plastically deformed to form a shape fit with respect to the axial direction 2. The knife-type clamping element 70 is arranged on the electrical conductor element 54, which is fixed to the wiring board 52 in an electrically insulating manner. The conductor element 54 is configured as a punched and bent part, and the knife-type clamping element 70 is integrally formed on the punched and bent part. The conductor element 54 has a meandering region 57, which extends transversely to the stator axis in a radial plane. The blade-like clamping elements 70 are preferably bent axially in such a way that all blade-like clamping elements 70 extend in a radially outer region in the axial direction 2 toward the receiving pocket 46. The blade-like clamping elements 70 have a greater width in the circumferential direction 2 than in the radial direction 4.A knife fork 72 is formed on the knife-like clamping element 70 centrally with respect to the circumferential direction 2, which moves in the receiving pocket 46 over the winding wire 22 during axial pressing in and thereby forms an electrically conductive knife-like clamping connection. The knife-like clamping element 70 is pressed into the receiving pocket 46 in such a way that the receiving pocket itself is centered with respect to the winding wire 22 and is clamped on the inside of the receiving pocket 46, for example, by means of formed latching hooks 74. In order that the knife-like clamping element 70 does not move in the receiving pocket 46 even under the action of external forces, compression ribs 25 are formed on the inside 47 of the receiving pocket 46, which compress the knife-like clamping element 70 in the radial direction 4, that is to say along the extension direction 26 of the inserted winding wire 22, into the receiving pocket 46.

[0026] The conductor elements 54 are connected to the wiring board 52 at their radially outer ends adjacent to the knife-type clamping elements 70 by means of material deformation. For this purpose, the punch pins 64 of the wiring board 54 are passed through the punched holes 65 in the conductor elements 54, wherein the free ends 66 of the punch pins 64 are formed by means of hot stamping. Deformed into a punch head 67. Thus, all conductor elements 54 are fixedly and immovably fastened to the connecting plate 54 in the radially outer region. The meandering region 57 of the conductor element 54 has a plurality of bends 56. On the end 69 of the conductor element 54 opposite to the knife-type clamping element 70, a contact module 60 is arranged, which is not directly connected to the wiring board 52. The contact module 60, for example, has a plug collar 61 to accommodate one or more plug sheets of the corresponding electronic unit 102. The end 69 of the conductor element 54 is, for example, injection-molded with the contact module 60 or clamped into this contact module. The end 69 forms an exposed contact strip 62 in the plug collar, which is electrically contacted by the plug sheet of the electronic unit 102.

[0027] exist Figure 2a4 shows an enlarged receiving pocket 46, into which the knife-type clamping element 70 is pressed in the insertion direction 12. A contact surface 23 is formed in the receiving pocket 46, on which the winding wire 22 is placed in the receiving pocket 46. For this purpose, the receiving pocket 46 has a slot 86 as a notch in the radial direction 4, so that the winding wire 22 is completely guided through the receiving pocket 46 in the radial direction 4. The knife-type clamping element 70 has a knife fork 72, on which two knife arms 73 are formed in a U shape. The knife arms 73 have knife edges 75 on their inner sides facing the winding wire 22, which cut into the winding wire 22 through the paint. When the knife-type clamping element 70 is pressed in, the winding wire 22 is pressed against the contact surface 23 in the axial direction 2. The knife-type clamping element 70 has a side edge 71, on which a latching hook 74 is formed. In this embodiment, two latching hooks 74 are formed on the opposite side edges 71. The latching hooks 74 are pressed into the interference 111 during the press-in, which is formed on the inner side of the receiving pocket 46. The latching hooks 74 thus form an undercut (hinterschnitt) with respect to the press-in direction 12, so as to prevent the knife-type clamping element 70 from moving back against the press-in direction 12. In order to prevent the knife-type clamping element 70 from having a gap in the receiving pocket 46 with respect to the extension direction 26 of the winding wire 22, a pressing rib 25 is formed on the inner surface 47 of the receiving pocket 46. The inner surface 47 of the receiving pocket 46 extends tangentially to the circumferential direction 3 in this embodiment and therefore extends transversely to the extension direction 26 of the winding wire 22. The pressing rib 25 extends upward from the bottom 45 below the receiving pocket 46 along the two knife-type arms 73. The pressing rib 25 preferably extends across the entire length of the knife-type arm 73 against the press-in direction 12. The squeeze rib 25 thus ends approximately in the region of the U-shaped connection 77 of the two blade arms 73. Two squeeze ribs 25 are arranged on the inner surface 47 of the receiving pocket 46 on both sides of the contact surface 23 of the winding wire 22.

[0028] Depend on Figure 2b It can be seen that two extrusion ribs 25 are arranged on both sides of the contact surface 23 opposite to each other along the extension direction 26. That is to say, the extrusion ribs are formed on both the radially inner inner surface 147 and the radially outer inner surface 148 of the receiving pocket 46. As a result, two extrusion ribs 25 are arranged opposite to each other along the extension direction 26 on each side of the winding wire 22. The extrusion ribs 25 are made of plastic material, and the extrusion ribs are especially formed with the insulating sheet 40 by means of injection molding when forming the receiving pocket 46. The cross section 27 of the extrusion rib 25 is arched transversely to the pressing direction 12 of the knife-type clamping element 70. Figure 2bIt can be seen that the cross section 27 of the squeeze rib 25 is larger in the middle region of the squeeze rib 25 than in the two edge regions 29. As a result, the plastic material of the squeeze rib 25 can be expelled more easily when the knife-type clamping element 70 is pressed in, so that the knife-type clamping element 70 is fixedly pressed between the opposite squeeze ribs 25 with respect to the extension direction 26. The relative movement of the knife-type clamping element 70 with respect to the inner surface 47 of the receiving pocket 46 in the extension direction 26 is interrupted. In order to more easily introduce the knife-type clamping element 70 into the receiving pocket 46, an introduction phase 88 is formed on the open edge 48 of the receiving pocket, which centers the knife-type clamping element 70 both with respect to the extension direction 26 and transversely to the extension direction 26. In order to press the blade clamping element 70 into the receiving pocket 46, two opposing pressing flanges 76 are provided, against which an auxiliary tool rests, in order to press the blade clamping element 70 into the receiving pocket 46 in the pressing direction 12. A connecting web 78 is provided between the two pressing flanges 76, which connects the blade clamping element 70 to the conductor element 54 of the wiring board 52. Figure 2a It can be seen that at the free ends of the blade arms 73, on their outer side edges 71, a wedge-tightening geometry 113 is formed, which abuts against the opposite inclined surfaces 114 of the receiving pocket 46. As a result, the free blade arms 73 are pressed more strongly against the winding wire 22 on both sides after they are pressed into the receiving pocket 46, thereby also causing the blade clamping element 70 to be pressed more strongly in the receiving pocket on the inclined surfaces 114 of the receiving pocket 46. In contrast to the curved cross section 27 of the compression rib 25, the cross section 27 can also be configured as a polygon, as in Figure 2a Here, the middle region 28 also has a larger dimension in the extension direction 26 than the two edge regions 29 of the cross section 27. The extension direction 26 of the winding wire 22 preferably corresponds to the radial direction 4, so that the dimension of the knife-type clamping element 70 in the radial direction 4 is significantly thinner than in the circumferential direction 3 of the stator 10.

[0029] exist Figure 3, in which a stator 10 according to the invention is installed in an electric motor 9. The stator 10 is inserted into a motor housing 104, wherein a grounding ring 38 rests against the inner side of the motor housing 104. On the stator 10 with the stator teeth 14, a single-tooth coil 17 is arranged as an electrical winding 20, the connecting wire 30 of which is guided through a receiving pocket 46 of an insulating sheet 40. A blade-type clamping element 70 is pressed into the receiving pocket 46 shown and is clamped in the receiving pocket 46 with respect to the radial direction 4 by means of a compression rib 25. The blade-type clamping element 70 is connected to a wiring board 52 via a connecting lug 78, which is designed here as an electronic printed circuit board 51. In this case, the connecting lug 78 can be directly electrically contacted with the printed circuit board 51 by means of a press-in contact 79, for example. Electrical conductor elements 54 are then formed on the printed circuit board 51 as printed conductors. The printed circuit board 51 is connected to the connecting plug 42, by means of which the electric motor 9 is energized. The wiring board 52 designed as a printed circuit board 51 is arranged in an electronics housing 106 of the electric motor 9, which is closed by a housing cover 105. The rotor 18 is arranged in the interior of the stator 10, which has permanent magnets 19. The rotor 18 is supported in the motor housing 104 via the rotor shaft 21, and for this purpose, this motor housing has a bearing cover 107 in particular. At one end of the rotor shaft 21 protruding from the motor housing 107, an output element 109 is arranged. Axially opposite, a sensor magnet 110 is arranged on the rotor shaft 21, which cooperates with a corresponding sensor device on the printed circuit board 51.

[0030] In another embodiment, a hardenable adhesive can be arranged axially between the electrical winding 20 and the wiring board 52, in particular on each single-tooth coil 17, which connects the wiring board 52 to the electrical winding 20 rigidly and immovably. This prevents the wiring board from bending the electrical conductor elements 54 during electrical contact. In addition, the conductor elements 54 are arranged in axially spaced planes of the wiring board 52 in an elastically deformable manner and overlap with each other with respect to their radial planes, wherein, in particular, insulating partitions 50 are formed between the conductor elements 54 on the wiring board 52, where the conductor elements 54 are extremely close in the same radial plane. The meandering structural scheme of the conductor elements 54 facilitates lateral force decoupling relative to the contact module 60. This protects the SKV connection in the receiving pocket 46 from disturbing forces.

[0031] It should be noted that, with regard to the embodiments shown in the drawings and in the description, a wide variety of possible combinations of individual features are possible. Thus, for example, the specific construction, arrangement and number of the squeeze ribs 25 and the construction and orientation of the receiving pocket 46 can be changed. The specific position and construction of the blade clamping element 70 with its blade arm 73 can also be adapted to the requirements and manufacturing possibilities of the motor 9. With the aid of the conductor elements 54, different wiring schemes can be implemented in the wiring board 52 or in the printed circuit board 51, such as a delta circuit or a star circuit for the individual phases of the electrical winding 20. The wiring board 52 can also be configured as a connecting plate, which does not connect a plurality of coils to each other, but directly connects the SKV connection of the receiving pocket 46 to the electronic unit 102. The invention is particularly suitable for the rotational drive of components or the adjustment of components in motor vehicles, but is not limited to such applications.

Claims

1. A stator (10) for an electric machine (9) having a stator base body (34) with radial stator teeth (14) for accommodating an electric winding (20), wherein: An electric winding (20) is connected to a wiring board (52) by means of at least one knife-type clamping element (70), wherein at least one receiving pocket (46) is formed on a stator base body (34), into which a winding wire (22) of the electric winding (20) is inserted, wherein the knife-type clamping element (70) is embedded in the receiving pocket (46), and a compression rib (25) is arranged in the receiving pocket (46), which compression rib is oriented in a direction of extension of the inserted winding wire (22). (26) The inserted knife-type clamping element (70) is clamped in a fixed position, and the extrusion rib (25) is arranged on two opposite sides with respect to the extension direction (26) in the receiving pocket (46), and the extrusion rib (25) has an arched cross-section (27) transversely to the pressing direction (12), and the size of the cross-section is larger in the center (28) of the extrusion rib (25) along the extension direction (26) than in the lateral edge area (29) of the cross-section.

2. The stator (10) according to claim 1, characterized in that The pressing ribs (25) are arranged in the receiving pocket (46) transversely to the extension direction (26) on both sides of a wire support surface (23) for winding the wire (22).

3. The stator (10) according to claim 1 or 2, characterized in that The knife clamping element (70) has a pressing collar (76) for pressing into the receiving pocket (46), which extends transversely to the pressing direction (12), and the knife clamping element (70) has a knife fork (72) with a free knife arm (73) integrally formed thereon, axially opposite the pressing collar (76).

4. The stator (10) according to claim 3, characterized in that The crushing rib (25) extends from the bottom (45) of the receiving pocket (46) counter to the pressing direction (12) over almost the entire length of the blade arm (73).

5. The stator (10) according to claim 1 or 2, characterized in that Exactly four squeeze ribs (25) are arranged in a single receiving pocket (46), two on a radial inner side (147) and two on a radial outer side (148) of the receiving pocket (46), wherein a support surface (23) for the winding wire (22) is arranged between two squeeze ribs (25) in each case with respect to the circumferential direction (3) of the stator (10).

6. The stator (10) according to claim 1 or 2, characterized in that At least two latching hooks (74) are formed on opposite side edges (71) of the knife-type clamping element (70), respectively, which engage with corresponding oversize (111) in the receiving pocket (46) in order to form an undercut with respect to the pressing direction (12).

7. The stator (10) according to claim 3, characterized in that A wedging geometry (113) is formed on the outer side edges (71) at the lower free ends of the knife arms (73), which is tensioned on corresponding bevels (114) of the receiving pocket (46) in order to wed the knife (72) more strongly in the receiving pocket (46) and at the same time increase the cutting force of the knife (72) on the winding wire (22).

8. The stator (10) according to claim 3, characterized in that The knife-type clamping element (70) is connected to an electrical conductor element (54) of the wiring board (52) opposite to the knife fork (72) along the pressing direction (12), wherein the electrical conductor element (54) is fixed to the wiring board (52) in an immovable manner by means of a fixing area (108), and a free end (68) of the conductor element (54) forms the knife-type clamping element (70), and a contact (60) for energizing an electrical winding (20) is formed at the opposite end of the conductor element (54), wherein the fixing area (108) is configured as a hot stamping structure of the wiring board (52) in order to fix the conductor element (54) to the wiring board (52).

9. The stator (10) according to claim 1 or 2, characterized in that The stator base body (34) consists of individually axially stacked laminations and has at least one plastic insulating cover (40) for insulating an electrical winding (20), wherein the receiving pocket (46) is formed with extruded ribs (25) within the insulating cover (40), wherein the insulating cover (40) has a closed circumferential ring from which a radial covering structure of radial stator teeth (14) extends, wherein the receiving pocket (46) is arranged in the region of the circumferential ring.

10. The stator (10) according to claim 9, characterized in that On at least two adjacent stator teeth (14), single-tooth coils (17) are wound with an uninterrupted winding wire (22), wherein a connecting wire (30) between at least two single-tooth coils (17) is guided on the radial outer side of the insulating cover (40), wherein the connecting wire (30) passes through at least one receiving pocket (46) in order to contact the individual single-tooth coils (17) by means of the knife-type clamping element (70).

11. An electric machine (9) having a stator (10) according to any one of the preceding claims, characterized in that The stator base body (34) is embedded in a motor housing, wherein the rotor (18) is supported in the stator (10) via a bearing shield (107) of the motor housing (104), and an electronic unit (102) for controlling the electrical winding (20) is arranged axially above a wiring board (52).

12. Method for producing a stator (10) according to any one of claims 1 to 10, characterized in that The following method steps: - a receiving pocket (46) with a compression rib (25) formed therein is formed in the insulating cover (40) of the stator base body (34), - the electrical winding (20) is then wound onto the stator base body (34) by means of a winding wire (22), wherein after the winding of the individual stator teeth (14) the winding wire (22) is guided radially through a receiving pocket (46) for a knife-type clamping element (70), - optionally applying an adhesive to the electrical winding (20), the adhesive hardening after being fitted onto the wiring board (52), - The wiring board (52) is axially joined to the insulating cover (40) in such a way that the knife-type clamping element (70) of the wiring board (52) is axially embedded in the receiving pocket (46) in order to electrically contact the winding wire (22), wherein the embedded knife-type clamping element (70) is clamped in a fixed position with respect to the extension direction (26) of the inserted winding wire (22) by the compression rib (25) of the receiving pocket (46).

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