WO2022194628A1

WO2022194628A1 - Method for producing a stator, and stator and electric machine having same

Info

Publication number: WO2022194628A1
Application number: PCT/EP2022/055987
Authority: WO
Inventors: Frank Schnaiter; Volker Koeninger; Martin Heyder
Original assignee: Robert Bosch Gmbh
Priority date: 2021-03-19
Filing date: 2022-03-09
Publication date: 2022-09-22
Also published as: DE102021202678A1

Abstract

The invention relates to a stator (12), and to a method for producing a stator (12) from a plurality of separate stator segments (14) which have a yoke region (28), from each of which a stator tooth (26) extends radially inwards, the method comprising the following steps: - arranging the stator segments (14) with the stator teeth (26) oriented radially towards the stator centre (11) and with a tangential distance (29) between adjacent yoke regions (28); - winding the stator teeth (26) with single-tooth coils (59) by means of needle winding, an uninterrupted connecting wire (42) interconnecting at least two single-tooth coils (59) and spanning at least one tangential distance (29) between two yoke regions (28); - radially compressing the stator segments (14) until their yoke regions (28) tangentially touch, the uninterrupted connecting wires (42) being bent by means of an auxiliary tool (44); and - mechanically connecting the individual stator segments (14).

Description

description

Method of manufacturing a stator, as well as a stator and an electric

Machine having such a

State of the art

Disclosure of Invention

DE 10 2007006095 A1 discloses a manufacturing method for a stator, in which a plurality of individual, separate stator cores are wound before they are combined to form a common stator. For winding, two partial cores are arranged opposite one another on a common axis. A connecting wire between the two partial cores when arranging the partial cores to the stator cores axially above the part, arranged transversely to the radial interior. In a further method step, further pairs of coils are assembled to form a stator, with the pairs of coils being electrically connected to one another. Such an assembly of the stator requires an additional assembly tool for arranging the connec tion wires between the partial coils, as well as an additional assembly step for contacting the coil pairs.

Disclosure of Invention

Advantages of the Invention

The method according to the invention for producing a stator, as well as the stator according to the invention and the electrical machine with the features of the independent claims have the advantage that the ring-shaped arrangement of the separate stator segments means that all stator segments can be connected in one process step with an uninterrupted winding wire how a full-cut stator can be wound using needle winding. There is no electrical contact between the individually wound stator segments and the tangential distance between the stator segments means that a high copper fill factor can still be achieved - as with the winding of individual toothed segments. The connecting wires between the single-tooth coils can be pressed radially inward at the same time as the stator segments are radially compressed using the same tool, so that an additional assembly step for the final positioning of the connecting wires is advantageously eliminated. The production of such ring-shaped stator segments spaced apart in the circumferential direction thus permits favorable variation possibilities in terms of assembly technology for the interconnection of the electrical machine with different electrical phases.

The measures listed in the dependent claims are advantageous further developments and improvements of the versions specified in the dependent claims possible. By fixing all stator segments on a common segment carrier, all stator segments can be wound together in analogy to a full-section stator. In this case, a spacer is arranged between two adjacent yoke regions, so that a circular ring formed by the stator segments again results, the stator teeth of which also have a larger spacing in the circumferential direction due to the spacers. As a result, for example, a nozzle of a needle carrier has more tangential space to wind the stator tooth with a high copper fill factor. The stator segments are supported on the spacers in the tangential and radial directions, so that the connecting wires on the outer circumference of the insulating laminations can be wound relatively tightly, compared to a full-section stator. The size of the spacers can be adapted to the number of stator segments or to the outside diameter of the stator body.

It is particularly favorable if all the stator segments are wound through with an uninterrupted winding wire. The winding sequence of the stator segments can be varied, with the respective connecting wire between two successively wound stator segments being applied to the outer circumference of the insulating lamellae of the stator teeth. For this purpose, the stator teeth Stator segments placed before winding an insulating mask, which preferably has two parts that are placed in opposite axial directions from above and below on the stator tooth. At least on one side, the insulating mask has an axial peripheral wall along the yoke area of the stator segment, on which the connecting wires can be supported radially from the outside. For this purpose, retaining grooves can be formed in the tangential direction in a particularly favorable manner on the outer circumference of this axial peripheral wall, into which the connec tion wires engage radially.

Due to the fixed fixation of the individual stator segments, the sequence of the stator teeth to be wound can be chosen freely. As a result, a connecting wire between two consecutively wound stator teeth can also extend over a larger peripheral area of the circular ring and in this way bridge several tangential distances between two adjacent stator segments one after the other.

With such a winding scheme, several different connecting wires can also span a specific tangential distance between two adjacent stator segments. The individual connecting wires are then preferably arranged axially one above the other, for example in axially adjacent tangential grooves on the outer circumference of the insulating mask. When the stator segments are compressed radially, all connecting wires can then be deformed simultaneously at a specific tangential distance until the yoke regions of the stator segments are in tangential contact with one another.

For reshaping the connecting wires, the auxiliary tool has bending fingers, for example, which preferably extend in the axial direction and are pressed inward in the radial direction towards the center of the stator. When forming the connecting wires, they are arranged in a tangential area between the stator teeth, axially above the electrical winding. The spacers between the stator elements are designed in such a way that they do not interfere with the needle winding of the stator teeth. After winding, the spacers are removed and the stator segments are pressed radially inward towards one another. In this process, the connecting wires are simultaneously the auxiliary tool reshaped in such a way that they do not protrude radially beyond the outer circumference of the stator segments.

So that the formed free connecting wires do not vibrate during operation of the electrical machine and thereby even break off, these bent connecting wires are reliably held in a fixed position by means of a holding plate. For example, such a retaining plate can have axial extensions that assume the position of the bending fingers after the connecting wires have been completely formed. The holding plate can advantageously be integrated into an electrical interconnection plate or into a bearing plate of the electrical machine.

Connecting lugs and corresponding recesses are formed particularly favorably on the opposite tangential sides of the yoke area, so that when the stator segments are assembled, they are precisely positioned relative to one another in order to achieve an optimal circular shape for the stator base body. This minimizes an air gap between two adjacent yoke areas, thereby optimizing the magnetic flux and the cogging torque. At the same time, the connecting lug and the corresponding recess serve as fixing elements, which engage in a form-fitting manner on the corresponding formations of the spacer elements. As a result, a mechanically very stable circular ring can be generated for the winding of all stator segments, in which the stator segments are arranged alternately with the spacers in the circumferential direction.

To produce the stator, the individual lamellar layers are preferably first punched out, with the T-shaped segments remaining connected to one another in the tangential direction using the precut technique or Kiri-Make method. With the precut technique, the individual T-segments are only punched through up to a certain fraction (1/2 to 4/5) and then pressed back into the initial position in the axial direction. The material tears between two T-segments along the dividing line and claws plastically into their coarse “fracture structure” when pushed back. As a result, the T-shaped segments remain connected to one another in the circumferential direction, despite being completely separated, via a plastic material deformation at the predetermined breaking point. The individual lamella layers are connected to one another in the axial direction, preferably by means of stamping and stacking. So that the stator teeth are more accessible for winding, the stator base body, which is closed in the circumferential direction, is separated between the individual T-shaped stator segments at the predetermined breaking point and the stator segments are pulled radially outwards. After that, insulating masks can be placed axially onto the stator segments and wound with a single-tooth coil in a particularly favorable manner. After winding, the individual T-shaped stator segments are reassembled at their predetermined breaking points by radial compression in the way they were before they were separated.

Particularly advantageous ra diale bushings are formed on the axial peripheral walls of the insulating masks, through which the winding wire is inserted in the radial direction during winding. As a result, the connecting wires between the individual coils can be routed on the radial outside of the insulating mask. A wire start and a wire end can also be fixed in such a radial passage. In a further embodiment, at least some of the radial passages can be designed as axial pockets for an insulation displacement connection (SKV), through which the winding wire is also passed in the radial direction. A cor responding insulation displacement element can then be inserted axially into such an SKV pocket in order to electrically contact a specific coil. By arranging such SKV pockets, the connection of the individual coils to different phase strands can be varied.

After the stator segments have been radially compressed, they are firmly fixed to one another. For this purpose, for example, two adjacent stator segments are connected to one another on the outer circumference by means of laser welding. Alternatively, the stator segments can also be glued to one another, or clamped to one another by means of the positive fit of the connecting lug with the recess. Thereafter, the stator segments are preferably pressed into a housing in order to permanently hold the stator segments in the exact position relative to one another. This can be done, for example, by means of thermal shrinkage presses. The stator produced according to the invention has stator segments which are preferably composed of individual, axially layered laminations. The outer circumference of the yoke areas can be approximately circular in a first embodiment, or have flattened, planar areas in an alternative embodiment in order to reduce the outer diameter of the stator base body. In a further variant, flattened areas and approximately circular areas can also alternate in the circumferential direction in order to ensure the exact assembly of the stator segments in a stator base body produced by means of precut technology.

Stators with relatively small diameters can also be produced particularly advantageously with the winding method according to the invention, which provide a high power density in a small installation space. Such a stator has, for example, exactly six stator segments, with the outer diameter of the stator base body being less than 35 mm, for example. Alternatively, however, stators with nine, twelve or eighteen stator segments can also be produced. For example, exactly two opposing stator segments are wound radially one after the other, so that the connecting wire between the opposing stator segments extends approximately over half the outer circumference of the stator base body.

The stator is advantageously used for an electrical machine in which the rotor has integrated permanent magnets. These permanent magnets can be arranged, for example, like spokes (longitudinal direction of the magnets in the radial direction) or tangentially (longitudinal direction in the circumferential direction). The stator of the electric motor can be glued into a housing part, for example, at low cost.

Brief description of the drawings

Embodiments of the invention are shown in the drawings and explained in more detail in the following description.

Show it: Fig. 1 shows a schematic cross section through an electrical machine with T-shaped stator segments,

2 shows a schematic of a process step of the winding method according to the invention with an unwound stator base body,

3 schematically shows further process steps of the winding method according to the invention, and

4 shows a representation of a further embodiment of a stator segment.

1 shows an electrically commutated motor 10 as the electrical machine 10 according to the invention. The electrical machine 10 has a stator 12 with a stator base body 16 radially on the outside. The stator base body 16 is composed of individual T-shaped stator segments 14 which have a yoke area 28 radially on the outside, from which a tooth 26 with a toothed shaft 22 extends radially inward. Tooth bases 23 are formed at the radially inner end of the tooth shafts 22 and then form the magnetic poles for the rotor 13 mounted radially inside the stator 14 . Insulating masks 56 are arranged on each of the T-shaped stator segments 14 and an electrical winding 58 is then wrapped around them. In this exemplary embodiment, each stator segment 14 has a single-tooth coil 59 which is connected to control electronics of the electrical machine 10 via a circuit arrangement (not shown). All of the stator segments 14 can preferably be wound through with an uninterrupted winding wire 41 . The stator base body 16 is composed of individual laminations 20 which are stacked axially one above the other. The individual stator segments 14 are composed of a plurality of toothed segments 24 of the individual lamina layers 21 stacked axially one on top of the other. A plurality of stator segments 14 (for example 12 pieces) form the stator base body 16 over the entire circumference, which is used, for example, in a motor housing 36 . The rotor 13 in FIG. 1 has a plurality of permanent magnets 80 which are accommodated in a basic rotor body 82 . The permanent magnets 80 are here, for example, on the radial surface of the rotor body arranged. In the tangential direction 9 between the permanent magnets 80, retaining webs 84 are here on the basic rotor body 82, which separate the permanent magnets 80, which are preferably magnetized in the radial direction 7, in the circumferential direction 9 from one another. In the exemplary embodiment, the permanent magnets 80 are designed in the shape of a loaf of bread, so that the outer circumference 86 of the rotor 15 is designed to be approximately circular. In particular, eight permanent magnets 80 are arranged on the rotor 13 and interact with the twelve stator poles formed by the T-shaped stator segments 14 . In alternative designs, 6/4 or 12/10 or 18/14 or 12/8 motor topologies are used. The individual laminations 20 of each lamina layer 21 are divided by lateral dividing lines 40 which extend approximately in the radial direction 7 from the outer circumference 35 of the yoke area 28 to the inner diameter 34 . A connecting lug 30 extends in the tangential direction 9 on the dividing line 40 of a first tangential side 18 of the yoke area 28 and, when assembled, engages in a corresponding recess 31 on the second tangential side 19 of the yoke area 28 of a neighboring toothed segment 24 . The dividing line 40 between the individual T-shaped toothed segments 24 of a lamella layer 21 is preferably produced by means of what is known as the pre-cut technique (or kiri-make). In a first step, the individual toothed segments 24 are not completely separated from one another axially from a sheet metal laminate 20 that is closed over the entire circumference using a punching tool, and in a second step they are pushed back axially into their original position to form a predetermined breaking point between the toothed segments 24 (Push Back). This results in a stator base body 16 which is closed over the entire circumference and which is only separated for the winding of the individual T-shaped stator segments 14 . The Ausneh determination 31 has a connecting lug 30 on the opposite side corre- sponding to geometry, between which the dividing line 40 of the two tangential direction 9 opposite toothed segments 24 runs in the radial direction 7. The connecting lug 30 and the opposite recess 31 are made in the same process step using the identical punching edge of the punching tool. During the stamping process, the outer circumference 35 of the stator base body 16 is completely severed, with the individual tooth segments 24 being separated in the circumferential direction 9 via the predetermined breaking point of the separating line 40. stay tied. The outer circumference 35 of the stator base body 16 is designed, for example, as approximately circular, but in further designs, as in FIG. 4, it can also have flattened, planar sections 83 .

2 shows how the stator segments 14 are arranged on a segment carrier 48 for winding. Instead of using the precut technique shown in FIG. 1, the individual stator segments 14 can also be produced in a different way as individual toothed segments, with the toothed segments 24 being punched out of the sheet metal in the usual way and then being connected to one another axially, for example using punched packages 54. The Statorseg elements 14 are encased with the insulating masks 56 and then fixed in a circular ring 15 on the segment carrier 48 . The axes of the tooth shafts 22 are all directed to the center point 11 of the stator body 16 . Between the yoke areas 28, a tangential distance 29 is formed in the tangential direction 9, in which a spacer 49 is arranged. For example, the spacers 49 have formations 50 in which the connecting lugs 30 and the recesses 31 of the yoke areas 28 engage in a form-fitting manner. As a result, the stator segments 14 are reliably fixed on the segment carrier 48 and can thereby be wound in the same way as a full-section stator. For this purpose, a wire nozzle 52 of a needle winder is moved up and down axially within the annulus 15 in order to wind a stator tooth 26 . The spacers 48 create a groove area 25 between the stator teeth 26 that is wide enough for the wire nozzle 52 to be able to wind two adjacent single-tooth coils 59 without having to reserve tangential space for the wire nozzle 52 in the finished stator 12 . Thus, all the stator teeth 26 can be wound through with an uninterrupted winding wire 41, the winding order of the stator teeth 26 being arbitrary. In order to continuously connect two stator teeth 26 to be wound one after the other, the winding wire 41 is guided as a connecting wire 42 on the outer circumference of the insulating masks 56 . The insulating masks 56 have radial passages 62 through which the winding wire 41 is guided in the radial direction 7 . Furthermore, pockets 64 for insulation displacement connections (SCS) can be formed as radial passages 62 on the insulating mask 56, into which the winding wire 41 is inserted. Corresponding SKV elements can be inserted into these SKV pockets 64 are inserted, by means of which the electrical winding 58 is contacted. By arranging the SKV pockets 64 between different individual tooth coils 59, various interconnection arrangements can be implemented. A wire start 66 and a wire end 67 can also be inserted into such an SKV pocket 64 . Between the radial passages 62 and/or the SKV pockets 64, the connecting wires 42 on the outer circumference of the insulating masks 56 also span the tangential distances 29 between the yoke areas 28.

In Fig. 3 is a ready-wound arrangement shown in FIG. 2 is shown schematically provides Darge, in which the spacers 49 have already been removed. The stator segments 14 are numbered 1-6 clockwise. The beginning of the wire 66 is, for example, on stator segment no. 1, in which case the winding wire 41, after winding stator segment no. 1, continues as a connecting wire 42, for example clockwise to stator segment no. 4, and there through a radial passage 64 radially from the outside inwards is guided to the stator tooth 26. Thereafter, stator segment No. 5 is wound, with the connecting wire 42 only spanning the one radial distance 29 between these immediately adjacent yoke areas 28 . Stator segment no. 5 is then connected via a connec tion wire 42 to stator segment no. 2, and this to no. 3 and this to no.

6 connected to which the wire end 67 is arranged. Thus, the winding sequence of the six stator segments 14 is implemented according to the winding scheme 1-4-5-2-3-6. If, for example, the radial bushings 62 are designed as SKV pockets 64 at the start of the coil of stator segment no. 1 and at the coil end of the single-tooth coils of stator segment no. 4, no. 2 and no Individual tooth coils 59 are formed. These can be controlled by electronics, not shown, which are preferably arranged axially above the connecting wires 42 .

After the winding is complete, the stator segments 14 are simultaneously pressed radially towards the center 11 along the arrows 71 and the auxiliary tools 44 are also pressed radially inwards along the arrows 72 . In Fig. 3, the stator 12 is shown in step 2 in the assembled state, in which in particular all yoke areas 28 touch each other tangentially. Here, the connec tion lugs 30 positively engage in the corresponding recesses 31. For the sake of clarity, only a single connecting wire 42 is shown here, which was deformed radially inward by the bending fingers 45. The connecting wire 42 is arranged radially inside the outer circumference 35 of the yoke area 28 and projects radially inward beyond the single-tooth coils 59, in the circumferential area between the stator teeth 26. Between two adjacent single-tooth coils 59, the tangential distance 93 can in particular be smaller than the Diameter 53 of the wire nozzle 52 or, in particular, smaller than a tangential slot 94 between two adjacent toothed feet 23.

In step 3, the auxiliary tool 44 is already removed in Fig. 3 and the Statorseg elements 14 are at least temporarily connected to one another. The stator segments 14 are inserted into a stator housing 36, which is only indicated in FIG. 3 and FIG. The stator housing 36 can, for example, be hexagonal or, alternatively, round. The connecting wire 42 now protrudes radially inwards with free loops 43 over the single-tooth coils 59. When assembling the electrical machine 10, the rotor 13 is mounted, which preferably has permanent magnets 80, in particular exactly four permanent magnets 80 for six stator segments 14, which form the stator poles form. In order to prevent the free loops 43 from swinging in the operating state, they are fixed with a holding plate 99 . This is integrated, for example, in a wiring board for electrical contacting of the individual tooth coils 59 or in an end shield for the rotor 13 . The stator segments 14 according to FIGS. 2 and 3 can be gefer taken by means of pre-cut technology, or as individual tooth segments 14 using conventional stamping technology. The stator segments 14 can also have circular yoke areas 28 instead of the planar yoke areas 28 .

4 shows a further embodiment based on an individual stator segment 14 produced by means of precut technology. The T-shaped toothed segments 24 of the individual disk layers 21 are held together axially by means of the stamped packages 54 to form a disk package. The stamped packets 54 are particularly circular here - with the top sheet metal lamella 20a circular perforations 95 are punched out, in which the material of the metal lamella 20b of the underlying lamellar layer 21 is plastically pressed. In order to separate two adjacent stator segments 14 of the stator base body 16--manufactured by precut technology--at least one separating wedge is preferably pressed axially into a stator slot 25 between the two tooth shafts 22. This separating wedge generates a separating force between the two yoke areas 28, which separates the predetermined breaking point. After the association of the stator segments 14 designed as laminations, the insulating masks 56 are placed on top of them and then wound with single-tooth coils 59 as shown in FIG. A marking 81 on the front side - or also on the outer circumference 35 - serves to ensure that the stator segments 14 for winding are arranged in the segment carrier 48 in exactly the same order as before they were separated, so that the individual "break-off structure" of each predetermined breaking point is ra dialen compression after winding is back together. The connecting lug 30 is formed on the first tangential end 18 of the yoke area 28 and engages again in the recess 30 of the adjacent yoke area 28 after assembly. The connecting lug 30 lies with tangential flanks 33 on opposite counter flanks 36 of the recess 31 in the radial direction 7 . At least one flattened section is formed in a first tangential area on the outer circumference 35 of the yoke areas 28

83 is punched out, which covers the toothed shaft 22 in the circumferential direction 9 . Each adjacent to the flattened portion 83 are the Zahnsegmen th 24 circular portions 84 of the outer periphery 35 punched on both sides. In order to reassemble the individual stator segments 14 to form the stator 12 after the winding, the stator segments 14 are inserted axially into an assembly tool that is cylindrical and conical. The circular sections

84 of the yoke areas 28 lie radially against the assembly tool and are pressed radially towards one another, so that the stator segments 14 are positioned exactly towards one another via the Torbo gene effect. It can be seen that the tangential ends 18, 19 of the yoke area 28 have a greater radial extension 89 on the circular sections 88 than the radial extension 85 on the flattened section 83 of the yoke area 24 on the stator tooth 26. In this embodiment can also be relatively small outer diameter 35 for such a stator base body 16 can be realized by means of precut technology, which can be 25-60 mm, for example.

It should be noted that with regard to the exemplary embodiments shown in the figures and in the description, a wide range of possible combinations of the individual features are possible. For example, the specific contour of the individual T-shaped toothed segments 24, the arrangement and number of stator teeth 26, and the design of the yoke areas 28 can be varied accordingly. The shape and dimensions as well as the manufacturing process of the separating line 40 with the connecting lug 30 can also be adapted to the requirements of the electrical machine 10 and its manufacturing options. For example, instead of the connecting lug 30 and the corresponding recesses 31, a straight dividing line 40 can be formed. Likewise, the specific winding sequence and the interconnection of the individual tooth coils 59 can be easily varied. As an alternative to the SKV connections, welding hooks or welding forks can also be used as contact elements for the individual tooth coils 59 . The invention is particularly suitable for the rotary drive of components or for the adjustment of moving parts in motor vehicles, but is not limited to this application. Due to the formation of the flattened sections 83, small motors 10 with a high power density can also be made available.

Claims

Expectations

1. A method for producing a stator (12) from a plurality of separate stator segments (14) which have a yoke region (28) from which a stator tooth (26) extends radially inwards, characterized by the following steps:

Arranging the stator segments (14) with the stator teeth (26) aligned radially towards the stator center (11) and with a tangential distance (29) between adjacent yoke areas (28)

Winding the stator teeth (26) with single-tooth coils (59) by means of needle winding, with an uninterrupted connecting wire (42) connecting at least two single-tooth coils (59) to one another and thereby spanning at least one tangential distance (29) between two yoke areas (28).

Radial compression of the stator segments (14) until their yoke areas (28) touch tangentially, the uninterrupted connecting wires (42) being bent over by means of an auxiliary tool (44).

Mechanical connection of the individual stator segments (14)

2. The method for manufacturing a stator (12) according to claim 1, characterized in that the stator segments (14) are held in a segment carrier (48) for winding, with the tangential distances (29) between the yoke areas (28 ) Spacers (49) are arranged on who the yoke areas (28) are supported.

3. A method for producing a stator (12) according to any one of the preceding claims, characterized in that all the stator segments (14) of the stator (12) on the segment carrier (48) in a circular ring (15) are net angeord, and the stator teeth (26) of all stator segments (14) are wound with an uninterrupted winding wire (41).

4. Method for producing a stator (12) according to one of the preceding claims, characterized in that the stator teeth (26) are encased in an insulating mask (56) before the winding, and the connecting wires (42) between the individual tooth coils are wound during the winding (59) on the radially outer circumference (57) of the insulating masks (56) - in particular in tangential grooves formed thereon.

5. The method for producing a stator (12) according to any one of the preceding claims, characterized in that the winding order of the stator segments (14) differs from their geometric order in the circular ring (15), and connecting wires (42) between the wound one after the other Satorsegmenten (14) extend over several tangential distances (29).

6. Method for producing a stator (12) according to one of the preceding claims, characterized in that several connecting wires (42) extend over exactly one tangential distance (29), the connecting wires (42) being laid axially one above the other during winding and when the stator segments (14) are pressed together, the plurality of connecting wires (42) are bent simultaneously by means of the auxiliary tool (44).

7. A method for producing a stator (12) according to any one of the preceding claims, characterized in that the auxiliary tool (44) at the tangential distances (29) between the stator segments (14) bending fingers (45) which during radial compression of the stator segments (14) bend the connecting wires (42) radially inwards, so that the connecting wires (42) are arranged axially over a slot region (25) between two adjacent stator teeth (26) - in particular before the stator segments ( 14) the spacers (49) between the yoke portions (28) are removed.

8. A method for manufacturing a stator (12) according to any one of the preceding claims, characterized in that after the radial assembly pressing the stator segments (14), a retaining plate (99) is placed axially on the stator segments (14), which permanently fixes the bent connecting wires (42) in a vibration-proof manner - the retaining plate (99) in particular being designed as part of a connecting plate or an end shield.

9. A method for manufacturing a stator (12) according to any one of the preceding claims, characterized in that on a first tangential side (18) of the yoke area (28) has a connecting lug (30) and on an opposite second tangential side (19) a corresponding recess (31) is formed, into which the connecting lug (30) engages in the radially compressed state, and the stator segments (14) during winding by means of the connecting lugs (30) and the recesses (31) on the spacer (49) be fixed.

10. The method for producing a stator (12) according to any one of the preceding claims, characterized in that the stator segments (14) are composed of individual lamellar layers (21), individual toothed segments (24) being made of a circumferentially closed lamellar layer (21) by means are punched out using the precut technique in such a way that the toothed segments (24) of each lamellar layer (21) remain connected to one another by means of a predetermined breaking point (40), the toothed segments (24) of each lamellar layer (21) first being only partially punched through, and in a further step, they are pressed back into the original axial position, so that the individual toothed segments (24) remain connected to one another only by small plastic deformations, and then several lamellar layers (21) to form a stator base body (16) - in particular by means of stamping packets ( 54) - are assembled axially, and then the stator body (16) to individual stator segments (14) vere individually, and the stator segments (14) are then fixed in the segment carrier (48) and after they have been wound, they are joined together again radially to form the stator (12), exactly in the same way as the toothed segments (24) previously via the predetermined breaking points ( 40) were connected to each other.

11. A method for manufacturing a stator (12) according to any one of the preceding claims, characterized in that the insulating masks (56) of Stator teeth (26) have radial bushings (62), and the connecting wire (42) between the single-tooth coils (59) and/or a wire feed (66) and/or a wire outlet (67) of the single-tooth coils (19) in the radial direction (30 ) are guided through the radial bushings (62) - and in particular at least part of the bushings (62) is designed as a pocket (64) of an insulation displacement connection, by means of which the individual toothed coils (59) can be connected to different phases.

12. Method for producing a stator (12) according to one of the preceding claims, characterized in that the stator segments (14) are mechanically connected to one another after being radially compressed by means of gluing or welding or clamping - and in particular axially in a stator housing (36 ) are inserted.

13. Stator (12), produced according to the method according to one of the preceding claims, characterized in that the yoke areas (28) have circular arc-shaped sections (88) on their outer circumference (35) and/or with a flat surface (83) are formed, and in particular the Statorseg elements (14) from individual axially stacked laminations (20) are put together.

14. Stator (12) according to claim 13, characterized in that the stator (12) has exactly six or nine or twelve or eighteen stator segments (14), in particular all individual tooth coils (59) of the stator segments (14) having a single through-wound Connecting wire (42) are connected to each other.

15. Electrical machine (10) with a stator (12) according to one of claims 13 or 14, characterized in that radially inside the stator (12) having a permanent magnet (80) rotor (13) is rotatably mounted - and in particular the stator (12) can be electronically commutated by means of an electronic unit.