CN113113998A

CN113113998A - Stator for an electric machine, electric machine and method for producing such a stator

Info

Publication number: CN113113998A
Application number: CN202110042579.8A
Authority: CN
Inventors: R·德切博雷尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2020-01-13
Filing date: 2021-01-13
Publication date: 2021-07-13
Also published as: DE102020200294A1

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 receiving an electric winding (20), wherein the electric winding (20) is connected to an electrical conductor element (54) by means of a cutting clamping connection (70) for supplying current to the winding (20), wherein an axial line section (32) of the winding (20) is formed on the stator (10), said line section extending in an axial direction (8), and the electrical conductor element (54) is formed in an annular manner and has an axial through-hole (60), through which the axial line section (32) protrudes, and the electrical conductor element (54) forms a cutting clamping connection with the axial line section (32) by means of its rotation in the peripheral direction (9).

Description

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

Technical Field

The invention relates to a stator for an electric machine, an electric machine and a method for manufacturing such a stator according to the type of the independent claims.

Background

DE 102012224153 a1 discloses a stator of an electric machine, in which insulating laminations, carrier plates and webs are arranged axially on a lamination pack. The stator is wound, for example, by means of a pin winding, wherein the individual partial coils are connected to one another by means of connecting lines on the outer circumference of the carrier plate. In this case, the entire winding is wound in one piece by means of a single winding wire. Since the connecting lines between the individual coils are arranged axially one above the other, the axial overall height of the stator is relatively large. Furthermore, the cost of welding the connection plate to the connection line is very costly.

DE 102008054529 a1 shows a stator of an electric motor, which is assembled from individual segments that are wound in advance. In this case, the wire ends of the single-tooth coils are inserted into the receiving recesses for the purpose of cutting and clamping the connection. Subsequently, a plurality of conductor elements having a plurality of bent cutting tines are pressed into the receiving recesses. The production of such conductor elements is relatively complex, and the bent cutting fork takes up a relatively large axial installation space above the stator winding. Furthermore, there is the risk that, in the further mounting of the bearing cover and in the contact electronics unit, the cutting fork is moved relative to the inserted wire and thus its electrical contact with the winding wire can be released. Furthermore, the axial positioning of the contact pins towards the electronic device has a large tolerance range on the basis of the variable penetration depth of the cutting fork into the receiving recess. These disadvantages should be eliminated by the solution according to the invention.

Disclosure of Invention

In contrast, the device according to the invention and the method according to the invention, which have the features of the independent claims, have the advantage that by forming the cutting clamping connection by means of a tangential relative movement between the cutting clamping element and the respective axial winding wire, an axial installation space above the stator winding can be saved. In contrast to the axial engagement of the cutting clamping element, the axial positioning of the conductor element and its connecting lug can always be precisely ensured, as a result of which a safer and simpler contacting of the coil with respect to the control electronics is possible. Furthermore, the conductor element can be designed more simply and cheaply and its mounting process can be simplified. Due to the rotary movement of the cutting-clamping element, the conductor element can be fixed in its angular position very simply after the cutting-clamping connection has been formed, for example by a positive locking or by a clamping.

Advantageous developments and improvements of the embodiments specified in the independent claims are possible by the measures mentioned in the dependent claims. Particularly advantageously, the cutting clamping element can be integrated in its entirety into the axial through-opening of the conductor element. The wire to be contacted is guided axially through the through-opening and is subsequently moved into the tangential slot of the through-opening by a rotational movement of the conductor element relative to the wire. In this case, the axial wire is clamped in a slot of the cutting-clamping element in order to electrically contact the conductor element. Preferably, at least one cutting-clamping element is provided per conductor element, however, it is also possible to form two or three or four cutting-clamping elements on a single conductor element in order to dispense (kontiierten) a plurality of single-tooth coils simultaneously.

In order to introduce the axial wire section into the through-opening with the shaped cutting-clamping element, a through-hole is cut into the through-opening, the diameter of the through-hole being greater than the wire diameter. The slot is formed in the bore as a tangential extension of the bore in the circumferential direction, the radial dimension of the slot being smaller than the wire diameter. The edges of the gap in the circumferential direction are each formed with a cutting edge, which cuts into the insulating varnish of the winding wire in order to establish a good electrical contact. According to a preferred embodiment, the radial width of the slot can be reduced gradually in the circumferential direction, so that the axial line section can be pressed into the slot more easily in the circumferential direction.

In order to be able to contact different coils with a plurality of conductor elements, further axial through openings are additionally also formed in each conductor element, which through openings are in the form of elongated holes extending in the peripheral direction. The slot has a radial width which is greater than the winding wire diameter over its entire extension in the peripheral direction, so that the slot does not contact the wire.

If a plurality of conductor elements are now stacked axially, so that the through openings are axially aligned, it is now possible for an axial line section to pass axially through all the stacked conductor elements, while only one of the conductor elements is electrically contacted. This means that, at a specific circumferential position, the cutting clamping element is always configured only on one of the stacked conductor elements. The elongated holes are formed in the other conductor elements at the peripheral position. In this way, all stacked conductor elements can be rotated simultaneously relative to the axial line section, wherein only the conductor elements are electrically contacted by means of a single cutting-clamping element.

By forming the cutting clamping element in the through-opening, the conductor element can be formed particularly advantageously in terms of production as a flat conductor rail, which extends in a radial plane. In this way, the formation of curved cutting clamping elements or curved soldering connecting elements is eliminated, so that the flat conductor rail can be stamped very easily. The conductor rail is designed in an annular manner, wherein the width of the conductor rail in the radial direction is greater than the thickness thereof in the axial direction, so that a through-hole can be punched in the axial direction. The conductor rails can be stacked axially in a very simple manner, wherein preferably the insulating layer is arranged axially between the respective conductor rails. For electrically connecting the conductor elements and the control electronics, a connecting web is preferably formed on each conductor element. Since the control electronics are preferably arranged axially above the conductor element, the connection lug is very advantageously designed as a bent tongue, which extends axially upward.

In a preferred embodiment, the axial line section is formed with an axially free end which can be introduced axially into the through-opening of the conductor element. In this embodiment, the through-hole is configured with a closed edge, as a result of which the conductor element has greater mechanical stability. Both the through-hole with the cutting clamping element and the slot have a closed, uninterrupted edge.

In an alternative embodiment, the axial line section is formed between the two single-tooth coils within the wound connecting line and has no axially free ends. In this embodiment, radial recesses are formed in all through-holes of the conductor element in order to introduce axial line sections into the through-holes. The connecting line between the two single-tooth coils has a radial component, wherein the radial recess of the through-hole is displaced onto the radial component when the conductor element is axially displaced.

The conductor element according to the invention is particularly suitable for connecting single-tooth coils, which are wound individually onto the individual stator teeth. The stator teeth for reducing eddy currents are assembled from individual sheet metal laminations and are covered by insulating laminations. Subsequently, winding wire is wound onto the stator teeth, wherein the wire of each coil is guided through two adjacent stator slots, respectively.

In a first embodiment, the stator is assembled from a plurality of single-tooth segments, which can be wound particularly advantageously individually. In this case, each single-tooth segment preferably has a respective stator tooth, which is integrally formed on the yoke segment in a T-shape. Each stator segment has its own insulating cover, to which the free wire start and the free wire end are preferably clamped fixedly at the same axial side. A plurality of such T-shaped stator segments are assembled into an annular stator and embedded in a stator housing. All axial line sections have axially free ends which can be inserted axially into through-holes with closed edges.

In a second embodiment, the stator is embodied as a so-called "full-cut" in which the yoke ring, with the radial stator teeth formed thereon, is stamped from sheet metal into a closed ring. The overall stator is assembled from a plurality of such annular stacks of sheet material. In this embodiment, the winding wire can advantageously be wound without interruption, so that a plurality of, or in particular all, single-tooth coils are wound with uninterrupted winding wire. In this embodiment, the connecting line between the two stator coils is held on the guide element of the insulating hood. The connecting line is designed as a closed loop, which however also has axial line sections. The axial line section is guided freely in sections in the axial direction, so that the conductor element with the radially open through-hole can be joined by the axial line section.

Alternatively, for example, two or more single-tooth segments can also be wound with uninterrupted winding wire. Thereby, the number of axial wire sections with free ends is reduced when the stator sections are assembled into a stator ring. Thereby, the number of through holes per conductor element can be reduced accordingly.

The plastic arranged axially between the conductor rails is suitable for insulating the individual conductor elements from one another. The plastic can be embodied, for example, in the form of a flat plastic ring, in which an axial through-hole is likewise provided. Alternatively, the insulation can also be achieved by injection molding the conductor element, so that the plastic simultaneously also fixedly splices the conductor element for insulation of the conductor element as a component, which is designed as a connecting ring. The connecting webs project from the plastic. Likewise, an axial through-hole for the axial line section is correspondingly provided in the plastic component. In a further embodiment, the conductor element can also be directly provided with an insulating surface, for example by means of a lacquer or another insulating coating.

It is particularly advantageous that all conductor elements of the electric motor can be manufactured with the same stamping tool. Since the individual conductor elements are arranged only at a specific offset angle relative to one another, the outer shape thereof, i.e. the conductor rail and the connecting webs formed thereon, can each be of identical shape. The sequence of the through-holes can also be configured in particular identically. In the case of three conductor rails, each third through-opening can be provided with a cutting clamping element, wherein the two other through-openings between them are configured as long openings without line contacts. If the stator has, for example, twelve single-tooth coils, the individual conductor rails can cover an angular range of approximately 270 °, and thus, for example, four single-tooth coils are contacted in each conductor element. By means of a specific angular offset between the individual conductor rails, the connecting webs are also arranged offset from one another by this offset angle.

The stator with the conductor elements according to the invention can be mounted particularly advantageously in a motor housing, wherein the electronics are arranged axially directly above the stator. The conductor elements can thus be connected to the control electronics for the stator winding via the connection tabs via plug-in or soldered contacts over a very short path. This allows the electric motor to be constructed very compactly with respect to the axial direction. The stator according to the invention is particularly suitable for manufacturing an electrical machine, wherein the rotor is arranged radially inside the stator as an inner mover. The stator coils are controlled by the electronics unit in order to set the rotor in rotation. Such an EC motor can preferably be used in a motor vehicle for driving a pump or a fan, or for linear adjustment of components, or as a traction drive.

In the production method according to the invention, the conductor element can be placed very simply axially onto the wound stator base body. The axial wire sections of the stator winding pass through the overlapping axial recesses of the conductor elements and can be reliably electrically contacted by the cutting clamping element by a rotational movement of the conductor elements relative to the axial wire sections. The axial position of the connection lugs of the conductor element can be very precisely maintained on account of the rotary connection. It is particularly advantageous here if all individual conductor elements are connected to one another in an insulated manner in advance, so that all conductor elements can be rotated simultaneously relative to the stator winding. In this case, only the through-hole and the cutting clamping element formed thereon always form an electrical connection to the axial line section. The production method according to the invention using the stator makes it possible to produce a very reliable cut-clamped connection which ensures a safe electrical contacting of the winding wire during the further installation of the electrical machine and over the entire service life thereof.

Drawings

Embodiments of the invention are illustrated in the drawings and set forth in detail in the description that follows. Wherein:

FIG. 1 shows a stator for constructing a cut-clamped connection in accordance with the present invention;

fig. 2 shows a first embodiment of a cutting-clamping connection according to the invention of a stator;

FIGS. 3 and 4 show detail views in top view of FIG. 2;

fig. 5 shows a further embodiment of a conductor element according to the invention;

FIG. 6 shows a schematic detail view according to FIG. 5;

FIG. 7 shows a further stator for constructing a cutting-clamping connection according to the invention; and is

Fig. 8 shows a further embodiment of a conductor element according to the invention.

Detailed Description

In fig. 1, a stator 10 is shown, which is assembled from individual manufactured stator segments 24 of a T-shape. Each stator segment 24 has stator teeth 14 onto which the single-tooth coils 17 are wound as part of the electrical winding 20. The stator segments 24 are assembled into an annular stator 10, the stator teeth 14 of which project radially inward. A cylindrical hollow space is formed in the interior of the stator 10, into which a rotor, not shown, can be inserted. The rotor is in rotation by the interaction of its permanent magnets and the stator windings 20. The stator segment 24 is formed by stacking individual sheet metal laminations 36, wherein insulating covers 40 are respectively placed on the upper and lower axial end faces 39, onto which the single-tooth coils 17 are wound with their free wire ends 26. The free wire ends 26 each extend in the axial direction 8, so that they form an axial wire section 32 of the winding 20. The insulating hood 40 has a retaining element 42 on its outer circumference 41, in which the free cable end 26 engages. The stator 10 of fig. 1 has, for example, twelve single-tooth segments 24, each of which has two axial line segments 32, which project axially beyond the insulating jacket 40.

In order to electrically contact the free wire ends 26 of the stator 10, the wire ends and the electrical conductor element 54 form a cut-and-clamped connection, which is schematically illustrated in fig. 2, for example. The conductor element 54 has an annular conductor track 56, in which a plurality of through-openings 60 are formed spaced apart from one another in the circumferential direction 9. In the exemplary embodiment, a plurality, in particular three, conductor elements 54 are arranged axially one above the other, so that the through-openings 60 of the conductor elements 54 lying one above the other are arranged in a specific circumferential position 66 aligned with one another in the axial direction 8, so that the free wire ends 26 project in the axial direction 8 successively through all successive through-openings 60. In each peripheral position 66, the through-holes 60 of the conductor elements 54 are each formed with a cutting clamping element 70, and the through-holes 60 of the other conductor elements 54 are formed as long holes 62 in this peripheral position 66, which have a width 63 in the radial direction 7 that is greater than the wire diameter 23. This means that each axial line section 32 is electrically connected to exactly one conductor element 54 at each circumferential position 66 by exactly one cutting clamping connection. Conversely, the axial line section 32 is electrically insulated at the peripheral position 66 from the other conductor elements 54. The cutting-clamping connection is formed by a rotation of the conductor element 54 in the circumferential direction 9 relative to the wound stator teeth 14, as is shown, for example, in fig. 2.

A segment of the conductor element 54 is schematically shown in fig. 3 before the cutting-clamping connection is constructed. The conductor elements 54 are placed axially stacked onto the free conductor end 26. In the left-hand angular position 66, the upper conductor element 54 has a cutting clamping element 70 with a circular area 74 with a larger diameter than the wire diameter 23. The gap 72 is directly adjacent to the region 74 in the peripheral direction 9, the gap having a width 71 in the radial direction 7 which is smaller than the wire diameter 23. The uppermost conductor element 54 has, at a distance in the peripheral direction 9, further through-openings 60 in the form of long holes 62, which do not contact the axial line section 26 in any angular position. In the middle, specific angular position 66, conversely, the second conductor element 54 (drawn to the right) has a cutting clamping element 70, and the first and third conductor elements 54 have an elongated hole 62 with a width 63 greater than the wire diameter 23. In the rightmost particular angular position 66, the two upper conductor elements each have an elongated hole 62 with a width 63 greater than the wire diameter 23. Only the third, lowermost (left-drawn) through-hole 60 has a cutting clamping element 70.

If, in fig. 4, all conductor elements 54 are now rotated in the counterclockwise direction in the circumferential direction 9 relative to the axial wire sections 32, the axial wire ends 32 are pressed into the slots 72 of the respective cutting-clamping element 70 in the circumferential direction 9. In this case, a cut edge 73 at the edge of the gap 72 cuts into the winding wire 22 in order to electrically contact the winding wire. For example, the cut edge 73 penetrates the insulation varnish of the winding wire 22. The respective axial line section 32 is therefore electrically connected to exactly one conductor element 54 at each specific circumferential position 66 via the rotatable cutting-clamping element 70. All through-holes 60 (both with the through-hole of the cutting clamping element 70 and also with the elongated hole 62 having the greater width 63) always have closed edges 64, so that only the axial line section 32 with the free end 26 can be inserted here.

A further embodiment of the conductor element 54 according to fig. 2 is shown in fig. 5. A curved connecting web 55 is formed on the annular, flat conductor rail 54, which web extends in the axial direction 8. The connection lug 55 is then connected to the electronics unit of the electric motor in order to energize the electrical winding 20. In this case, by cutting the arrangement of the clamping element 70 on the conductor element 54, different connections of the single-tooth coil 17 can be achieved. The annular conductor rails 56 in this case each extend in particular over an angular range of more than 270 ° in order to each electrically contact a plurality of axial line sections 32. In this case, the individual conductor elements 54 are rotated relative to one another in the circumferential direction 9 by an offset angle 52. The individual conductor elements 54 can therefore preferably be of identical design, wherein the through-opening 60 and the cutting-clamping element 70 are displaced relative to one another by the offset angle 52 in the circumferential direction 9. Alternatively, the configuration of the vias 60 may also vary among different conductor elements 54. For the sake of clarity, only the conductor elements 54 which are not isolated from one another are shown in the figures. Preferably, the conductor elements 54 are injection-molded with plastic, so that a plastic layer 80 is arranged axially between the individual conductor rails 56, which plastic layer in particular also holds the conductor elements 54 together mechanically. The connecting ring 82 is thus formed as a plastic injection-molded part, in which the conductor element 54 is accommodated as an insert part. Alternatively, the conductor elements 54 can also be coated with insulating elements and directly connected axially to one another.

Fig. 6 again shows a schematic illustration of three conductor elements 54 stacked on top of one another without embedded axial line sections 32 at specific circumferential positions 66. It can be seen that the respective through-openings 60 are arranged exactly axially one above the other with respect to the circumferential direction 9. The uppermost through-hole 60 is configured with a cutting clamping element 70, and the two through-holes 60 below it are configured as long holes 62 with a width 63 greater than the wire diameter 23. In this case, if the axial winding wire section 32 is inserted axially and rotated relative to the conductor elements 54 in the peripheral direction 9, the winding wire 22 cuts only into the gap 72 of the uppermost conductor element 54. The lower two conductor elements 54 are not in contact with the axial line section 32. Here, schematically, an insulating plastic 80 is shown, which is arranged axially, in particular injected, between the conductor elements 54.

Fig. 7 shows a further embodiment of a stator 10 with an integrated grounding ring 38 which is closed in the circumferential direction 9 and on which radial stator teeth 14 are formed for receiving electrical windings 20. Between the stator teeth 14, stator slots 16 are arranged, into which winding wire 22 is inserted. In this embodiment, the stator teeth 14 are again directed radially inward, so that a rotor, not shown, can be supported in the stator teeth 14, which rotor is driven by the stator 10 as an inner mover. The stator 10 is assembled from individual annular sheet metal laminations 36 which are stacked in the axial direction 8 and connected in a common pack of laminations. The sheet metal laminations 36 are preferably stamped so that the stator teeth 14 are constructed integrally with the ground ring 38. The ground ring 38 is embedded in the stator housing 12, for example pressed in. In this housing 12, the electronics unit for controlling the winding 22 can also be arranged axially above the stator 10. An insulating cover 40 is arranged on the first axial end face 39 of the pack stack, which insulating cover preferably completely covers the end face 39 with an insulating material. Preferably, the insulating cover 40 is configured as a plastic injection-molded part, which is placed axially onto the pack of laminations. The lamination pack and the insulation cover 40 together form the stator base 34. The insulating hood 40 has a closed circumferential ring 41 on the radial outside, on which guide elements 44 are formed, which guide the connecting wires 30 of the winding wire 22 as loops 31 between the single-tooth coils 17. In this case, a plurality of, or in particular all, stator teeth 14 are preferably wound with uninterrupted winding wire 22. The winding wire 22 is guided by the wound single-tooth coil 17 outward in the radial direction 7 so as to be guided in the peripheral direction 9 radially outside the guide element 44. In this case, an axial wire section 32 is formed on the uninterrupted circuit 31, which can in turn be brought into contact with the electrical conductor element 54 by means of a cutting-clamping connection. For this purpose, a through-hole 60 adapted to the circuit 31 is formed in the conductor element 54, as is shown, for example, in fig. 8. All the through-openings 60 of all the conductor elements 54 have a radially open edge 68. For example, the through-hole 60 with the shaped cutting clamping element 70 has notches 68 radially inward on the area 74 with the larger diameter. Likewise, the recess 68 is formed radially inward on the elongated hole 62. The radial recesses 68 are aligned precisely in the axial direction 8 at specific angular positions 66. Thus, the conductor element 54 can also be placed axially onto the uninterrupted loop 31, wherein the radial components 33 of the loop 31 are guided through the radial recesses 68 in the radial direction 7. The radial wire assembly 33 is arranged axially higher than the axial wire section 32, so that the conductor element 54 can be rotated again in the circumferential direction 9 relative to the axial wire section 32 after axial positioning, so that the cutting edge 73 of the cutting clamping element 70 cuts into the axial wire section 32. The annular conductor rails 56 are in turn rotated relative to one another by an offset angle 52 in the circumferential direction 9, wherein the radial recesses 68 are formed at equal intervals in the circumferential direction 9.

It is to be noted that, with regard to the embodiments shown in the figures and in the description, various combination possibilities of the individual features with one another can be achieved. Thus, for example, the specific configuration, arrangement and number of the through-holes 60 can be varied, in particular the ratio of the through-holes 60 with the cutting clamping elements 70 relative to the elongated holes 62 can also be varied. Likewise, the specific location and shaping of the cutting clamping element 70 and its cutting edge 73 can be adapted to the requirements and manufacturing possibilities of the motor. Different connections of the individual phases of the electrical winding 20 can be realized by means of different conductor elements 54, wherein the respective connection ring 82 with the connection tabs 55 can have different shapes. The design and number of the single-tooth coils 17 with their corresponding connecting lines 30 result in a corresponding shaping of the axial line sections 32 to which the through-openings 60 or their radial recesses 68 are adapted. The invention is particularly suitable for the rotary drive of assemblies or for the adjustment of components in motor vehicles, and for use as an electric traction drive, but is not limited to this application.

Claims

1. Stator (10) for an electric machine (12), having radial stator teeth (14) for receiving an electrical winding (20), wherein the electrical winding (20) is connected to an electrical conductor element (54) by means of a cutting clamping connection for supplying current to the winding (20), wherein an axial line section (32) of the winding (20) is formed on the stator (10), which line section extends in an axial direction (8), and the electrical conductor element (54) is formed in an annular manner and has an axial through-hole (60), through which the axial line section (32) protrudes, and the electrical conductor element (54) forms a cutting clamping connection with the axial line section (32) by means of a rotation in a peripheral direction (9).

2. Stator (10) according to claim 1, characterized in that a cutting clamping element (70) is formed on at least one axial through opening (60) of each conductor element (54), said cutting clamping element having a gap (72) in the circumferential direction (9), the radial width (71) of said gap being smaller than the wire diameter (23) of the axial wire section (32).

3. Stator (10) according to one of the preceding claims, characterized in that the cutting clamping element (70) has a region (74) with a larger diameter than the wire diameter (23) and a gap (72) with a smaller radial width (71) is adjacent to the region (74) in the circumferential direction (9), wherein the gap (72) has an edge configured as a cutting edge (73) which cuts into the axial wire section (32).

4. Stator (10) according to one of the preceding claims, characterized in that the further through-openings (60) of the conductor elements (54) are configured as long holes (62) in the circumferential direction (9) which have a greater width (63) than the wire diameter (23) over their entire extension in the circumferential direction (9), so that in particular the axial wire sections (32) do not electrically contact edges (64), preferably no contact edges (64), of the long holes (62).

5. Stator (10) according to one of the preceding claims, characterized in that a plurality of conductor elements (54) are arranged axially one above the other such that their through openings (60) are axially superposed, wherein the axial line sections (32) form an electrically conductive cutting clamping connection at specific circumferential locations (66) with in each case only exactly one of the superposed through openings (60) and no electrical contact is made with the other conductor elements (54) at the circumferential locations (66).

6. Stator (10) according to one of the preceding claims, characterized in that the through-opening (60) is formed on a flat conductor rail (56) of the conductor element (54), the radial width (57) of which is greater than the axial thickness (58) thereof, wherein the individual conductor rails (56) are electrically isolated from one another, and the conductor element (54) has a connection tab (55) for contacting control electronics, wherein in particular the connection tab (55) is bent axially upwards from the conductor rail (56).

7. Stator (10) according to any of the preceding claims, characterized in that the through-hole (60) has a closed edge (64) and the axial wire section (32) has a free axial end (26) which axially passes through the through-hole (60).

8. Stator (10) according to one of the preceding claims, characterized in that the through-hole (60) has a radially, in particular inwardly, open edge (68) and the axial wire sections (32) passing through the through-hole (60) each form a loop (31) of the wound winding wire (22) of the winding (20).

9. Stator (10) according to one of the preceding claims, characterized in that the stator (10) is assembled from individual axially stacked sheet material laminations (36) and has at least one insulating cover (40) made of plastic for insulating against the electrical winding (20), and the winding (22) has single-tooth coils (17) which are wound onto exactly one stator tooth (14) each.

10. Stator (10) according to one of the preceding claims, characterized in that the stator (10) has a T-shaped single-tooth section (24), on the stator teeth (14) of which a single-tooth coil (17) is wound in each case, and in that the wire start (27) and the wire end (28) of the winding wire (22) form a free axial end (26) of an axial wire section (32), wherein in particular the free axial end (26) is fixed on a radially outer region of the insulating jacket (40).

11. Stator (10) according to one of the preceding claims, characterized in that the insulation shield (40) has a closed outer circumferential ring (41) and the monodentate coils (17) of adjacent stator teeth (14) are wound with an uninterrupted winding wire (22) such that between the monodentate coils (17) a continuous connection wire (30) is arranged, which connection wire forms a loop (31) with axial wire sections (32), wherein in particular the loop (31) is held on a guide element (44) which is shaped on the insulation shield (40).

12. Stator (10) according to one of the preceding claims, characterized in that plastic (80) is arranged axially as an insulation between the conductor rails (56), wherein no plastic is arranged in the through-hole (60), and in particular the conductor elements (54) are injection-molded with the plastic (80) in order to form a connecting ring (82) which is directly axially supported on the insulation hood (40).

13. Stator (10) according to one of the preceding claims, characterized in that the outer shape of a plurality of, in particular exactly three, conductor elements (54) is configured almost identically and the conductor elements (54) are arranged offset from one another in the circumferential direction (9) by an offset angle (52), wherein in particular in the circumferential direction (9) only each third through-hole (60) of a conductor element (54) is configured as a cutting clamping element (70).

14. Electrical machine (9) with a stator (10) according to one of the preceding claims, characterized in that the stator (10) is embedded in a motor housing (12), wherein the rotor is supported within the stator (10) by means of a bearing cover in the motor housing (12), and preferably an electronics unit for controlling the electrical winding (20) is arranged axially above the conductor elements (54) and in electrical contact with the connection tabs (55) of the conductor elements (54).

15. Method for manufacturing a stator (10) according to any of claims 1 to 13, characterized by the following method steps:

-winding an electrical winding (20) onto a stator base body (34) having at least one insulation shield (40), wherein after winding the axial wire section (32) extends in the axial direction (8),

-the conductor element (54) is placed onto the winding (20) in the axial direction (8) such that the axial wire section (32) passes axially through the axial through hole (60) of the conductor element (54),

-the conductor element (54) is rotated in the circumferential direction (9) relative to the winding (22) about the stator axis, wherein the cutting clamping element (70) of the conductor element (54) forms a cutting clamping connection with the axial wire section (32),

-preferably, all conductor elements (54) are simultaneously rotated by the same rotational angle relative to the winding (20).