WO2016110423A1

WO2016110423A1 - Wiring plate for a stator of an electric machine, and method for manufacturing same

Info

Publication number: WO2016110423A1
Application number: PCT/EP2015/081262
Authority: WO
Inventors: Marko Anesi; Tamas Csoti
Original assignee: Robert Bosch Gmbh
Priority date: 2015-01-07
Filing date: 2015-12-28
Publication date: 2016-07-14
Also published as: DE102015200086A1

Abstract

Disclosed are a wiring plate (52) for a stator (10) of an electric machine (12) as well as a manufacturing method for a stator (10) of said type, said wiring plate allowing an electric winding (16) of the stator (10) to be connected to client-specific terminal plugs (56) for supplying power. The disclosed wiring plate (52) comprises conductor elements (58) that are provided with axial connection plugs (54) for the terminal plugs (56) and with fastening sections (60), the ends (67) of which have a flat, especially an approximately rectangular cross-section, said ends (67) surrounding a round connecting wire (31) of the winding (16) in a contacting manner.

Description

Description title

Circuit board for a stator of an electric machine and method for producing such

The invention relates to the circuit board for a stator of an electric machine, and to an electric machine and to a method for producing such a stator according to the preamble of the independent claims.

State of the art

With DE 10 2012 224 153 AI, a stator of an electric machine has become known, in which axially on a laminated plate package, an insulating plate and a Verschaltungsscheibe are arranged. The stator is wound for example by means of needle winding, wherein the individual partial coils are connected to each other by means of connecting wires on the outer periphery of the Verschaltungsscheibe. In such a stator, the phase terminals for the coils are led out of the stator for example by means of a flexible cable and connected to a spatially separated control unit of the electric motor. The object of the invention is now to provide a favorable contacting of the stator coils with a directly axially arranged over the stator electronics unit with a customer specified electronic interface.

Disclosure of the invention

Advantages of the invention

The device according to the invention and the method according to the invention with the features of the independent claims has the advantage that, due to the design of the conductor elements with a flattened fastening section, it is reliable can be contacted with the round connecting wire. Through the levels

Outside surfaces of the end of the conductor element can this with a defined

Enclosed contact surface around the round connecting wire, and on the other hand electrodes are defined to be applied to the outer abutment surface of this loop. This ensures a reproducible flow of current through the electrodes to the loop and also a more flat attachment of the loop to the

Bonding wire to provide reliable electrical contact during the hot-stacking welding process by sufficiently removing the bondline insulating varnish. The flattened attachment sections can

production technology favorable by an approximately rectangular

Wire cross section - with in particular two parallel opposite

Outside surfaces - are produced.

The measures listed in the dependent claims advantageous refinements and improvements of the embodiments specified in the independent claims are possible. If a round wire pin is required by the customer's electronic interface as a connection plug, it is particularly advantageous if the one-piece conductor element of a round

Wire cross-section on the connector plug in the flattened wire cross-section merges with the flat outer surfaces of the attachment portion.

The attachment section for the connection wire is approximately at right angles to one

Central portion of the conductor element bent radially outwards and advantageously has only after this bending region on a flattened cross-section. As a result, the middle section and the angled connection plug can be bent more easily according to the path on the circuit board and fixed on this by means of clip connections.

Particularly simple, the flattened wire cross section by means of two

opposite punch or rolling tools are produced, whereby in this cold forming the cross-sectional area approximately over the wire length remains constant. As a result, the conductor elements have the same good electrical conduction properties over their entire length.

The middle sections of the conductor elements extend annularly in a plane along the closed ring of the interconnection plate and are supported axially on this ring. The terminal plugs are then angled axially and are guided in axial guide channels of the axially extending holding elements, wherein the ends of which form the wire pins for the connection plug. At the

opposite end of the conductor elements are then flattened as loops fastening portions bent radially outward.

It is particularly favorable whenever two connection plugs are guided in a common holding element, so that only three axial extensions are formed as holding elements in the case of six connection plugs. The two adjacently arranged connection plug are electrically insulated from each other by the plastic guides of the holding elements. In a 12-toothed stator, all partial coil pairs are thus controlled as six separate phases

Plastic ring six separate conductor elements with a total of six connection plugs are arranged. The holding elements can be wrapped advantageously by means of a separate custom cover plate, which then the plug socket for the

Connection to the control unit with the connection plugs forms.

Furthermore, the middle parts of the conductor elements are radially offset on axially different planes, so that here is a touch of the conductor elements

avoided among each other. Due to the higher arrangement of the inner

Conductor elements whose radially outwardly angled mounting portions can cross the middle portions of the outer middle portions without contacting them.

Advantageously, the insulating lamella integrally molded on the insulating lamella

Guide elements, in which the connecting wires between the sub-coils are inserted during winding. So that the individual connecting wires do not touch, they are arranged on axially different levels on the insulating lamella. In order to minimize the Verschaltungsaufwand the individual coil sections, are always two geometrically directly in the circumferential direction adjacent sub-coils connected to a so-called partial coil pair, which forms a complete phase, for example, in a 12-toothed stator. Two directly adjacent partial coils are particularly advantageously wound uninterrupted in time directly one after the other, as a result of which a very short connecting wire is formed between these two partial coils of the partial coil pair.

These short connecting wires of these partial coil pairs are particularly favorably arranged all in the axially uppermost plane (maximally spaced from the stator body), so that they are particularly easily accessible for the fastening sections with their

Slings. As a result, there is sufficient free space for the electrodes of the hot-stacking method at these connecting wires. For this purpose, the cylindrical guide elements on radial recesses in which the connecting wires run quite freely without contact with a plastic component.

In a 12-tooth stator, six stator teeth are wound on the radially first stator half with a first winding wire, and thereafter the remaining six stator teeth are wound with a second separate winding wire. In this case, preferably the wire beginning and the wire end of a single winding strand in the insulating lamellae are arranged side by side in parallel - in particular clamped into corresponding labyrinth-shaped recordings of the insulating lamella in order to fix them reliably - so that these two adjacent wires can be electrically contacted together by the fastening sections of the conductor elements. in the same way as the individual short connecting wires of the wound through coil pairs. The loop with the flattened wire cross-section is thus placed around one or two parallel connecting wires and radially compressed by means of the hot-stacking electrodes.

The electric machine according to the invention has a stator body, which is stacked from individual laminations, which together result in a disk set.

In each case, all the stator teeth with the outer yoke ring of the stator each form a one-piece closed in the circumferential direction stator blade. On two immediately adjacent stator teeth is connected to a connecting wire

Part coil pair wound, which is connected in each case via its own conductor element to the control unit. The current flows through the connection plug to Wire pin over the middle section and the attachment section to the

Partial coil pair connection wire.

In the manufacturing method according to the invention, the interconnection plate is axially applied with their spacers directly to the end face of the stator body, and the conductor elements are then electrically connected to the connecting wires of the sub-coil pairs. For this purpose, the flat outer surfaces of the loop are applied transversely to the connecting wires and bent to an at least approximately closed loop and contacted electrically.

In the hot-stacking process, the two electrodes are each applied to the flat radial outer surfaces of the loop and pressed radially into the radial opening of the guide elements. During the energization of the electrodes, the

Melted wire insulation and the material of the loop deformed, so that a reliable electrical contact between the attachment portion and the connecting wire is provided.

After mounting and contacting the wiring plate with the

Connecting wires, the stator can be axially mounted in a motor housing, for example, pressed or glued. Thereafter, a bearing plate can be axially added to the wiring board, the bearing plate has at the points of the holding elements corresponding openings to the plug socket with the

To record connection plugs. These breakthroughs in the bearing cap then form the electrical feedthroughs from the engine control unit to the electrical winding of the stator.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it:

1 shows schematically a winding scheme according to the invention

2 shows an interconnection according to the invention of the individual phases

3 shows a first embodiment of a wound stator with insulating lamella 4 is a corresponding plan view of FIG .. 3

5 and 6 an embodiment of FIG. 3 with attached

Circuit board and

7 shows the embodiment according to FIG. 5 with a customer cover plate, and FIG. 8 shows an inventive conductor element without a circuit board, and FIG

Fig. 9 shows schematically the hot stacking connection method.

In Fig. 1, a cut-open stator 10 is shown schematically, on the

Statorzähnen 14, the winding diagram of the electrical winding 16 according to the invention is shown. The stator 10 has, for example twelve stator teeth 14, wherein each stator tooth 14 is always wound exactly one partial coil 18. In each case, two directly adjacent partial coils 18 are connected by means of a short connecting wire 31 to an adjacent partial coil pair 17, each of which forms a separate phase 26 VI, U1, W1, V2, U2, W2 in this embodiment. In this case, the three phases 26 VI, Ul, Wl form a separate winding strand 24, which is wound from a separate winding wire 22. The three phases 26 V2, U2 and W2 form a second winding strand 25, which is wound from a separate winding wire 22 and electrically insulated from the first winding strand 24, as shown by the dash-dot line between the sixth and seventh stator tooth 14. With the electrical winding 16, for example, a first wire beginning 28 on the second stator tooth 14 is started and a connecting wire 30 is led to the fifth stator tooth 14. Immediately after the fifth stator tooth 14, the sixth stator tooth 14 is wound, so that the sub coil pair 17 is connected by means of the short connection wire 31. After the sixth stator tooth 14, the winding wire 22 is guided by means of the connecting wire 30 to the third stator tooth 14, there to form a connected by means of the connecting wire 31 partial coil pair 17 with the fourth stator tooth 14. From the fourth stator tooth 14, the winding wire 22 is guided as a connecting wire 30 to the first stator tooth 14, where the wire end 29 of the first winding strand 24 immediately adjacent to

Wire start 28 is ordered. The second winding strand 25 is connected to a separate winding wire 22 corresponding to the winding of the first

Winding strand 24 wound, so that a further three coil pairs 17 arise from immediately adjacent arranged partial coils 18, which are connected by means of a short connecting wire 31. The wire beginning 28 and the wire end 29 of the two winding strands 24, 25 are each electrically connected to each other. Thus, six phases 26 can be controlled separately from each other.

This is shown for example for a triangular circuit in Figure 2, in which the first phase winding 24 with the three phases 26 VI, Ul, Wl is completely separated electrically from the second phase winding 25 with the three phases 26 V2, U2, W2. Thus, for each of three phases 26, two separate triangular circuits are realized. In this case, the six phases 26 (each consisting of a Teilspulem Paarl7) are energized respectively via the short connecting wires 31, which are each arranged between two adjacently arranged partial coils 18 on immediately adjacent stator teeth 14. In the exemplary embodiment, the stator 10 has a total of twelve stator teeth 14. However, embodiments are also conceivable in which each of the six phases 26 has, for example, a total of three or four partial coils 18, which are wound accordingly to 18 or 24 stator teeth 14.

FIG. 3 shows a three-dimensional view of a stator 14, which is wound in accordance with the winding diagram of FIG. The stator 14 has a stator 34, which is composed of individual laminations 36, for example. The stator body 34 in this case comprises an annular closed yoke yoke 38, on which the stator teeth 14 are formed radially inwardly. Inside, the stator points

14 a circular recess 37 into which a not shown rotor can be inserted, as better seen in Figure 4 can be seen. The stator teeth 14 extend in the radial direction 4 inwards and in the axial direction 3 along the rotor axis. in the

Embodiment, the stator teeth 14 are formed entangled in the circumferential direction 2 to reduce the cogging torque of the electric motor 12. For this purpose, for example, the laminations 36 in the circumferential direction 2 accordingly

twisted against each other. Before the stator body 34 is wound, 39 insulating lamellae 40 are placed on both axial end faces in order to electrically insulate the winding wire 22 from the stator body 34. At least one of the two insulating lamellae 40 has an annularly closed circumference 41, from which 4 insulator teeth 42 extend in the radial direction and cover the end faces 39 of the stator teeth 14. At the annular periphery 41 of the insulating lamella 40 are

Guiding elements 44 are formed, in which the connecting wires 30, 31 are guided between the sub-coils 18. For this purpose, 41 grooves 45 are formed in the circumferential direction 2, for example, on the outer circumference, so that the connecting wires 30, 31 in axially offset planes are arranged to prevent crossover of the connecting wires 30, 31. The short connecting wires 31 between the sub-coil pairs 17 are arranged in the uppermost axial plane 32, wherein in particular all six connecting wires 31 for contacting the phase connections all run in the same axial plane 32. For this purpose, two axial extensions 46 are always formed on the insulating lamella 40 between two partial coils 18 of a partial coil pair 17, which are provided by an intermediate radial opening 47

are separated from each other. Thus, the short connecting wires 31 are the

Part coil pairs 17 freely accessible from all sides and are not in particular in the region of the radial opening 47 on the insulating lamella 40 at. The two

Wire starts 28 and wire ends 29 are fixed in this embodiment in a labyrinth arrangement 50, which are each arranged in the circumferential direction 2 immediately adjacent to the two axial extensions 46, which are spaced by the radial opening 47. Thus, it can be seen in FIG. 3 that the wire beginning 28 of the first winding strand 24 runs parallel and immediately adjacent to the wire end 29 of the first winding strand 24 over the circumferential region of the radial opening 47. In this case, the wire beginning 28 in a first labyrinth arrangement 50 on one side of the radial opening 47, and the wire end 29 of the first

Winding strand 24 is arranged in a second labyrinth arrangement 50 in the circumferential direction opposite to the radial opening 47. Through this parallel

Arrangement of the short connecting wires 31, these can be electrically contacted in the same manner as the connecting wires 31 of the wound coil coil pairs 17 for the purpose of phase control. In Figure 4 is also clearly visible that the two parallel

Connecting wires 31 are arranged at the same radius. The free ends of the wire beginning 28 and the wire end 29 terminate directly after the corresponding labyrinth arrangements 50, so that they do not protrude radially beyond the connecting wires 30, 31. The connecting wires 30, 31 all extend in the circumferential direction 2 along the guide elements 44 and lie radially outside of the wound on the stator teeth 14 sub-coils 18. In Figure 4, the two motor halves 11, 13 are also schematically separated by the dash-dotted line, the left half of the engine 11th is electrically isolated from the right motor half 13. The electrical winding 16 is manufactured, for example, by means of needle windings, wherein the connecting wires 30, 31 are guided radially outwards between the sub-coils 18 by means of a winding head and into the guide elements 44 can be stored. In this embodiment, all the connecting wires 30, 31 are arranged axially on one side of the stator body 34. In an alternative, not shown embodiment, it is also possible to move a portion of the connecting wires 30, 31 on the axially opposite side of the stator 14. In this case, for example, the short connecting wires 31 for

Contacting the phase control in a first insulating lamination 40 are arranged, and the other connecting wires 30, the various

Part coil pairs 17 each connect to each other, are guided on the axially opposite arranged Isolierlamelle 40.

In Figure 5 is on the embodiment of the stator 10 according to Figure 3 a

Connected circuit board 52, by means of which the electrical winding 16 is driven. For this purpose, the circuit board 52 connection plug 54, can be added to the custom connector connector 56 of a controller. In this embodiment, exactly six connection plugs 54 are arranged, which are each electrically connected to a phase 26 of the electrical winding 16. In this case, each phase 26 is formed by exactly one partial coil pair 17, so that the six connection plugs 54 are contacted with exactly six connecting wires 31 of adjacent partial coil pairs 17. For this purpose, the interconnection plate 52 has exactly six conductor elements 58 which, at an axial bend 100, terminate the connection

Plug 54, and at the other end 67 has a mounting portion 60 which is connected to the connecting wires 31 - for example, welded - is. The circuit board 52 has a plastic body 62, which is formed as a closed ring 61, through which the rotor can be inserted into the stator 10. On the plastic body 62 integrally holding elements 63 are integrally formed, which in

Axial direction 3 from the stator 34 extend away. The guide elements 58 extend in the circumferential direction 2 along the plastic body 62, wherein the angled connection plug 54 are guided within guide channels 99 of the holding elements 63 in the axial direction 3. At the other end 67, the conductor elements 58 have a fastening portion 60 projecting radially on a bending region 70, the free end of which is designed as a loop 64 which surrounds the connecting wires 31. In this case, the loop 64 is formed from a sheet material whose cross-section is approximately rectangular. In the embodiment, the

Conductive regions 57, the connection plug 54 and the middle portions 78 formed as a round wire, which at the bending region 70 in the flattened - in particular rectangular - cross section of the loop 64 passes. The free end of the

Fixing portion 60 can be bent around the connecting wire 31 during its mounting. After placing the open loop 64 around the

Connecting wire 31, for example, on both radially opposite flat surfaces 79 of the loop 64 with the rectangular wire cross-section

Electrodes 71 are applied, which are compressed in the radial direction 4, while they are energized to weld the loop 64 with the connecting wire 31. Here, the insulating varnish of the connecting wire 31 is melted, so that there is a metallic bond between the attachment portion 60 and the connecting wire 31. The loop 64 is in the region of the radial

Breakthrough 47 placed around the connecting wire 31, since no guide member 44 between the connecting wire 31 and the loop 64 is disposed in this area. As a result, sufficient space for the application of the electrodes 71 is present, so that a free leg end 65 of the loop 64 against the

Fixing portion 60 can be pressed, whereby the loop 64 is closed. Depending on the partial coil pair 17, the loop 64 encloses only a single connecting wire 31 or at the same time two parallel connecting wires 31, which are formed from the wire beginning 28 and the wire end 29 of a single winding strand 24, 25. The connection plug 54 are here designed as wire pins 55, with their free axial end 68 in a

corresponding connection plug 56 of the customer - for example by means of an insulation displacement connection - can be inserted. Trained as a wire pin 55 connection plug 54 is supported axially with the bend 100 on the plastic ring 62 as an axial stop 72 from. Furthermore, a first guide surface 74 and a second guide surface 75 are formed on the holding element 63, which the

Support connection plug 54 in both opposite circumferential directions 2. This prevents the terminal connector 54 from inserting the

Connecting plug 56 in the circumferential direction 2 or buckle, whereby the axial tolerances of the connector is ensured. The first guide surface 74 and the second guide surface 75 are integrally formed here in the guide channels 99 of the holding elements 63. The conductor elements 58 are arranged at least partially radially next to each other, whereby it is necessary that the

Fixing portions 60 of the inner conductor elements 58 radially cross the outer conductor elements 58 to be contacted with the connecting wires 31. Therefore, the radially inner conductor elements 58 on an axially higher track 76 of the Plastic body 62 arranged, and the radially outer conductor elements 58 on an axially lower path 77. Here are formed as a round wire middle portions 78 of the conductor elements 58 on the plastic body 62 and are connected for example by means of clip elements 48 with this. For this purpose, for example, on the plastic body 62 axial two opposite latching hooks 49 are formed, between which the round wire of the conductor elements 58 is clipped axially. The latching hooks 49 are preferably produced in one piece with the plastic body 62 by means of injection molding.

In the exemplary embodiment, two connection plugs 54 are always arranged in a common holding element 63, wherein the holding elements 63 each have two separate axial guide channels 99 for the wire pins 55. As a result, the wire pins 55 are arranged in the circumferential direction 2 separated from each other electrically. In this case, the guide channels 99 respectively form the first and second guide surfaces 74, 75 for the respective adjoining connection plug 54. The two guide channels 99 are interconnected by a circumferential wall 97, and thus together form the one-piece holding elements 63 for accommodating two wires each. Pins 55. In the region of the holding elements 63 are - this axially opposite - spacer 84 formed, which supported the interconnection plate 52 axially relative to the stator 34. In the embodiment of Figures 5 and 6 has exactly one retaining element 63rd

for example, a different axial cross section and / or axial

Length expansion on, as the other two retaining elements 63. This creates an anti-rotation for a bearing cap, not shown, which is axially joined with correspondingly shaped axial openings on the retaining elements 63. The bearing cap is joined by means of an assembly tool on the holding elements 63, which can feel both the axial extent of the holding elements 63 and the axial cross-section. In this defined rotational position is then the

Control unit contacted with the connection plugs with the connection plugs 54. The holding elements 63 engage in the openings of the bearing cap and thus form a plastic insulation of the wire pins 55 relative to the bearing cap. Axially opposite to the holding elements 63 axial spacers 84 are formed, which engage in passage openings 108 in the insulating lamella 40. The

Spacers 84 are located directly on the end face 39 of the stator 34, so that the ends 68 of the wire pins 55 a defined distance from the stator 10 and have the surrounding motor housing. The spacers 84 are connected via support webs 66 in one piece with the holding elements 63.

FIG. 6 shows how the two wire pins 55 rest against their guide channels 99 on both sides. In the region of the axial bend 100, the conductor element 58 first extends radially inwards, this region resting against an angular support element 73 and in particular being fixed directly adjacent by means of the clip connection 48. Each angled in opposite circumferential directions 2, the respective central portion 78 of the conductor element 58 adjoins, which is also formed as a round wire. Since the radially adjacent conductor elements 58 are arranged on axially different tracks 76, 77, they do not touch, so that they are electrically insulated from each other.

In FIG. 7, the stator 10 of FIGS. 5 and 6 is covered with a customer masking plate 51, which is fastened axially over the interconnection plate 58. In this case, covers the Kundenabdeckplatte 51, the conductor elements 58 at their central portions 78 axially and radially. The customer cover plate 51 is made of insulating material, preferably plastic, so that the middle sections 78 are insulated. In the area of the holding elements 63, the customer covering plate 51 has cover boxes 53, which enclose the guide channels 99 and have axial holes 105 for the passage of wire pins 55. Thus, the cover boxes 53 plug socket 103 for the

Contacting the connection plugs 56 dar. At least one of

Cover boxes 53 has one of the other deviating axial cross-section, which corresponds to the corresponding axial opening in the bearing cap. The anti-rotation device for the bearing cap can therefore also be realized exclusively by the cover boxes 53 of the customer covering plate 51 or in conjunction with the axial cross section of the retaining elements 63. By shaping the rotation lock directly on the plastic body 62, the axial manufacturing and

Mounting tolerance of the customer cover plate 51 are eliminated. In addition, a defined rotational position of the stator 10 can be achieved to the axially mounted control unit by this rotation during assembly of the control electronics unit.

In Figure 8, a conductor element 58 again without plastic body 62 of

Circuit board 52 shown to illustrate the manufacture of the conductor elements 58. The starting material is a wire with an approximate one round wire diameter, which is bent or bent according to the course on the wiring board 52. The wire pins 55 are bent at the bends 100 axially by about 90 °, the central portions 78 extend along the interconnecting plate 52, not shown. The mounting portions 60 are bent in a bending region 70 radially outward and have the open loop 64 with the free leg 65 is bent to the assembly on the wire connection 31 to a closed loop 64, as shown in Figure 9. From the bending region 70, the originally round wire diameter is flattened so that the cross-section has two flat, approximately parallel outer surfaces 79. In the exemplary embodiment, the wire is in the attachment section 60

approximately converted to an approximately rectangular cross-section. This is preferably done by cold plastic deformation of the wire by means of two

opposite pressing tools, before the wire is bent into loop 64. As a result, the entire loop 64 is formed with the approximately rectangular cross-section. As a result, the electrodes 71 during hot stacking, or

Welding process are applied to the flat surfaces 79 of the loop 64, and thereby the free leg 65 are pressed against the opposite region of the loop 64 reliable. The electrodes 71 lie on two

opposite approximately parallel outer surfaces 79 of the loop 64, whereby these defined can be compressed. It is the

Connecting wire 31 enclosed by the loop 64 and melted the insulating varnish during welding. This creates a solid electrical and mechanical connection between the connecting wire 31 and the loop 64th

FIG. 9 shows the hot-stacking production method for contacting the

Conductor elements 58 shown with the connecting wires 31. The first still open loop 64 is placed around the connecting wire 31. In the case of the partial coil pair 17, which consists of the first and last wound partial coil 18 of a

Wicklungsstrangs 24, 25 composed, the loop 64 around the mutually parallel connecting wires 31 of the wire beginning 28 and the

Wire end 29 laid. Then, the electrodes 71 are applied to the outer flat surfaces 79 of the loop 64, radially compressed and energized. In this case, the conductor loop 64 is approximately closed around the connecting wires 31, since in the radial opening 47 of the insulating lamella 40 no disturbing guide elements 44 are in the way. The attachment portion 60 is by means of the clip connection 48 at the circuit board 52 fixed. About the connection plug 56, the electrical winding 16 is contacted with a control device in which, for example, the interconnection of Figure 2 can be realized, the six

Attachment sections 60 with the respective loops 64, the six phases 26 VI, Ul, Wl. V2, U2, W2 according to the winding diagram of Figure 1 on the respective

Energize wire pins 55.

Claims

claims

Circuit board (52) of a stator (10) of an electrical machine (12), by means of which an electrical winding (16) of the stator (10)

custom interconnect plugs (56) connectable to the power supply, the interconnect plate (52) including conductor elements (58) comprising axial connector plugs (54) for the interconnect plugs (56) and mounting portions (60) on the one hand; the ends (67) of which have a flattened-in particular approximately rectangular-cross section, and the ends (67) enclose a round connecting wire (31) of the winding (16) in a contacting manner.

Circuit board (52) according to claim 1, characterized in that the conductor elements (58) conductor regions (57) which are formed from a wire having a circular cross section, and in particular the connection plug (54) as wire pins (55) with are formed circular cross-section.

Circuit board (52) according to claim 1 or 2, characterized in that the conductor regions (57) extend in the circumferential direction (2) from the connection plugs (54) to the fastening portions (60), wherein the

Fixing portions (60) in the radial direction (4) at a bending portion (70) are bent, and at or after the bending region (70) of a

circular cross section in the flattened cross section.

Circuit board (52) according to one of the preceding claims, characterized in that the surface of the cross section of the conductor element (58) over its longitudinal extent - in particular including

Terminal plug (54) and the mounting portions (60) - remains approximately constant, and preferably the cross-sectional change of the conductor element (58) is produced by plastic material deformation.

Circuit board (52) according to any one of the preceding claims, characterized in that it comprises a plastic ring (62) designed as a closed ring (61), on which, in one piece, in

Axialrichtung (3) extending retaining elements (63) are formed, in each of which the axial connector plug (54) extend axially, and central portions (78) of the conductor element (58) along the plastic body (62) are arranged, and in particular by means of clip connections (48) on the plastic body (62) are fixed.

6. Wiring plate (52) according to one of the preceding claims,

characterized in that exactly three retaining elements (63) are formed in which exactly two wire pins (55) in axial guide channels (99) are fixed - and in particular the holding elements (63) are covered by a separately manufactured Kundenabdeckplatte (51) ,

7. Wiring plate (52) according to one of the preceding claims,

characterized in that the middle portions (78) of first and second conductor members (58) are axially disposed on different tracks (76, 77), and the attachment portion (60) of the first conductor member (58) is the central portion (78) of the second conductor member (58) - in particular non-contact - radially crossed.

8. stator (10) with a wiring plate (52) according to one of

previous claims, characterized in that on a

Stator body (34) is formed on its outer periphery (41) formed closed insulating lamella (40), the guide elements (44) for

Connecting wires (30, 31) between the individual coil sections (18), and the connecting wires (30, 31) in axially different planes

are arranged, wherein all the connecting wires (30, 31) between the immediately adjacent partial coil pairs (17) of a phase (26) in an axially uppermost level (32) are arranged, and in each case electrically to the

Attachment sections (60) connected - in particular welded - are.

9. stator (10) with a wiring plate (52) according to one of

preceding claims, characterized in that the

Guide elements (44) radial openings (47), in which the

Attachment portions (60) with a closed loop (64) engage radially to enclose in the circumferential direction (2) connecting wires (31).

10. Stator (30) with a wiring plate (52) according to one of

preceding claims, characterized in that the loop (64) exactly one or exactly two mutually parallel connecting wires (31) completely encloses - and preferably by means of a hot-stacking welding process - with these electrically and mechanically connected.

Electric machine (12) with a rotor and a stator (10), comprising a circuit board (52) according to one of the preceding claims, characterized in that two directly adjacent partial coils (18) are directly connected to each other by means of connecting wires (31) as wound through winding wire (22) without

Interruption are formed, always two immediately adjacent sub-coils (18) form a separate phase (26), the connecting wire (31) via the mounting portion (60) by means of a separate wire pin (55) as a connection plug (54) controllable is.

Method for producing a stator (10) according to one of the preceding claims, characterized in that after assembly of the

Circuit board (52) and the conductor elements (58) over the wound insulation mask (40) the open loops (64) of the mounting portions (60) are positioned transversely to the connecting wires (31) therearound, and then by means of a hot stacking process two electrodes (71) opposite to the open loop (64) at the flattened

Cross sections are created and pressed together and welded together, so that a closed loop (64) is formed, which

Connecting wire (31) electrically contacting enclosing.

A method of producing a stator (10) according to any one of the preceding claims, characterized in that radially on both sides of the open loop (64) enough space for the two electrodes (71) is formed, and the electrodes (71) radially in the radial Breakthrough (47) are pressed together - in particular during welding, the insulating varnish of the connecting wire (31) is melted, so that a firm electrical contact between the connecting wire (31) and the loop (64) is generated.