Stator for an electric machine and method for manufacturing one

Abstract

Stator (10) for an electric machine (12), comprising a stator body (34) having radial stator teeth (14), each stator tooth (14) accommodating exactly one partial coil (18) of an electrical winding (16), the winding (16) consisting of exactly two separate winding strands (24, 25) wound from exactly two separate winding wires (22), each having three phases (26) with at least two partial coils (18, 17), wherein an insulating lamella (40) is arranged on each of the axial end faces (39) of the stator body (34), and at least one of the two insulating lamellae (40) is closed at its outer circumference (41) and has guide elements (44) for connecting wires (30, 31) between the individual partial coils (18) which are arranged in axially different planes, wherein the wire beginnings (28) and the wire ends (29) of the first and second winding strand (24,25) are each fixed in labyrinthine shapes (50) of the insulating lamella (40), wherein a wire start (28) and a wire end (29) of the same winding strand (24, 25) are arranged parallel to each other over a certain circumferential area (47), so that they can be contacted together with a conductor element (58) of a connection plate (52).

Description

[0001] The invention relates to a stator for an electric machine, as well as to an electric machine and to a method for manufacturing such a stator according to the preamble of the independent claims. State of the art

[0002] DE 10 2012 224 153 A1 discloses a stator of an electric machine in which an insulating lamination and a connecting disk are arranged axially on a laminated core. The stator is wound, for example, with needle windings, the individual sub-coils being connected to each other by means of connecting wires on the outer circumference of the connecting disk. The entire winding is wound in one piece using a single winding wire.

[0003] DE 10 2013 208 570 A1 shows a stator having two separate winding strands that divide the electrical machine.

[0004] In DE 10 2009 000 681 A1 an electrical machine with a stator is disclosed in which several twin coils are connected in series, each to form a stator phase.

[0005] US Patent 2014 / 0346910A1 discloses an electrical machine with single-tooth coils arranged on a stator, in which the stator winding is divided into several parallel circuits.

[0006] DE 10 2012 224 153 A1 shows insulating lamellae arranged on both sides of a stator, in which a shim disk is placed on one side of an insulating lamella and has guide elements on its outer circumference.

[0007] US 2007 / 0057591A1 and US 2011 / 0243768A1 describe stators in which partial coils are wound on stator teeth on which insulating masks have previously been placed.

[0008] For safety-critical applications of electric motors, such as power steering, the intrinsic safety of such electrical windings is a recurring topic of discussion. There is a risk that damage to, for example, the insulating varnish of the winding wire could cause a short circuit in the winding, leading to the electric motor seizing up. The solution according to the invention is intended to prevent such a risk. Disclosure of the invention Advantages of the invention

[0009] The device and method according to the invention, with the features of the independent claims, have the advantage that, by designing the electrical stator winding as two electrically completely separate winding strands, it is ensured that even in the event of a short circuit in one winding strand, the motor can continue to be operated with the other winding strand. While the power of the electric motor may be reduced, it is still possible to reliably perform safety-relevant applications, such as steering a vehicle, possibly requiring greater physical effort. If the winding is designed with two times three phases, the motor can continue to be operated with the remaining three phases in the event of a short circuit, with each phase consisting of at least two partial coils wound on different stator teeth.

[0010] The measures listed in the dependent claims enable advantageous further developments and improvements of the embodiments specified in the independent claims. For example, the stator body is preferably designed as a continuous ring in the circumferential direction, with the individual stator teeth formed radially inwards on this ring. Preferably, the stator has twelve stator teeth, but embodiments with 18 or 24 stator teeth are also possible.

[0011] The stator body is advantageously constructed from individual sheet metal laminations stacked together to form a laminated core. To reduce the cogging torque of the electric machine, the individual stator laminations are particularly advantageously twisted relative to each other in the circumferential direction, so that the longitudinal direction of the stator teeth deviates from the axial direction by a certain angle of twist. In this configuration, each stator tooth, together with the outer yoke ring of the stator, forms a single, circumferentially closed stator lamination.

[0012] To achieve the inherent safety of the electric motor, the first winding is geometrically arranged entirely on one half of the stator, and the second winding is arranged entirely on the opposite half. This effectively divides the motor into two halves, ensuring that in the event of a short circuit, one half (within a 180° angular range of the stator body) remains functional. A particular advantage of this design is that the connecting wires between the individual coil sections do not cross at the terminal block, further reducing the likelihood of a short circuit.

[0013] According to the invention, an insulating lamella is arranged on each of the axial end faces of the stator body to insulate the electrical winding from the laminations. At least one of the two insulating lamellae has guide elements integrally formed within it, into which the connecting wires between the partial coils can be placed during winding. To prevent the individual connecting wires from touching, they are arranged on axially different planes on the insulating lamella. To minimize the interconnection effort of the individual partial coils, two partial coils that are geometrically directly adjacent in the circumferential direction are always connected to form a so-called partial coil pair, which, for example, in a 12-tooth stator, each form a complete phase.Particularly advantageous is the continuous winding of two immediately adjacent partial coils one after the other, thereby forming a very short connecting wire between these two partial coils of the partial coil pair.

[0014] Furthermore, a partial coil pair can also be produced by first winding a first partial coil with a wire start and then winding an adjacent stator tooth circumferentially at the end of a winding strand, connecting the wire end to the wire start so that this connection also forms a short connecting wire of a partial coil pair. According to the invention, the wire start and the wire end are clamped into corresponding recesses in the insulating lamella to reliably fix them. For this purpose, the recesses are designed in a labyrinthine shape.

[0015] After winding, the short connecting wires of each coil pair all lie on the same axial plane. To connect the individual coils, a so-called connection plate is axially mounted onto the insulating lamella. Different connection plates allow for various wiring configurations. The connecting wires, laid in the guide elements, form a defined interface that can be connected to corresponding mounting sections of the conductor elements. For example, a connection plate can electrically connect two coil pairs to form a common phase with a total of four coils, or it can control each coil pair as a separate phase with only two coils. The connection plate features different conductor elements, some with only three, others with six, for example, connectors for the engine control unit.

[0016] The terminal plate is designed as a plastic ring that is axially arranged on the sub-coils. The inner opening of this plastic ring corresponds approximately to the inner stator opening, into which the rotor can then be inserted. The outer diameter of the plastic ring is smaller than the outer circumference of the insulating lamella, so that the plastic ring can be inserted radially within the outer circumference of the insulating lamella. This design means that the terminal plate does not require any additional radial installation space.

[0017] For secure positioning of the connectors, axial extensions are integrally formed on the plastic ring, serving as connector sockets. The connectors are angled approximately at right angles to the conductor elements, the other ends of which are electrically contacted with the winding's connecting wires via the mounting sections. These mounting sections form a defined connection interface with the connecting wires, and the central part of the conductor elements and the connectors can be designed according to customer requirements. If two partial coil pairs are connected to form a common phase, the connection plate has only three integrally formed conductor elements. However, if all partial coil pairs are to be controlled as six separate phases, six separate conductor elements with a total of six connectors are arranged on the plastic ring.The conductor elements can advantageously be designed as bent stamped parts or as bent wires.

[0018] It is particularly advantageous if two connectors are always guided in a common retaining element, so that with both six and three connectors, only three axial extensions are required as retaining elements. The two adjacent connectors are electrically insulated from each other by the plastic guides of the retaining elements. Furthermore, the central sections of the conductor elements run radially offset on axially different planes, thus preventing contact between the conductor elements. This means, for example, that the first connector of a retaining element is electrically contacted by a partial coil pair that is radially opposite another partial coil pair (at 180° in the stator), which is connected to the connector of the other conductor element in the same retaining element.

[0019] The conductor elements can be attached to the plastic ring very simply and reliably by hot stamping. For this purpose, axial rivet pins are formed on the plastic ring, which extend through corresponding holes in the conductor elements. The ends of the rivet pins are then plastically deformed into rivet heads. Alternatively, the conductor elements can be fixed using snap-fit ​​elements molded onto the plastic ring. If the conductor elements are formed as die-cut sheet metal parts, the connectors can be very cost-effectively designed as insulation displacement connectors (IDCs), into whose end notches a corresponding clamping element of the connector to the control unit can be inserted.

[0020] After the terminal block is mounted and connected with the connecting wires, the stator body can be axially mounted into a motor housing, for example, by pressing, shrink-fitting, or gluing. A bearing shield can then be axially attached to the terminal block, with the bearing shield having corresponding recesses at the locations of the retaining elements to accommodate the connector sockets with the connecting plugs. These recesses in the bearing shield then form the electrical feedthroughs from the motor control unit to the electrical winding of the stator.

[0021] The electrical winding of the stator is preferably carried out using a needle winding machine, in which a winding head inserts the winding wire along the inclined stator slots and guides the connecting wires between the partial coils in the corresponding guide elements of the insulating lamination. For example, in the case of a twelve-tooth stator, six stator teeth on the radially first stator half are wound with a first winding wire, and subsequently the remaining six stator teeth are wound with a second, separate winding wire. Preferably, the wire start and wire end of a single winding strand are arranged parallel to each other in the insulating lamination, so that these two adjacent wires can be electrically connected together through the mounting sections of the conductor elements – in the same way as the individual short connecting wires of the wound partial coil pairs.This results in two electrically isolated motor halves, which, depending on requirements, can also be easily interconnected electrically via a corresponding connection plate using the defined interfaces of the connecting wires. Brief description of the drawings

[0022] Exemplary embodiments of the invention are shown in the drawings and explained in more detail in the following description. They show: Fig. 1 schematically a winding scheme according to the invention Fig. 2 a connection of the individual phases according to the invention Fig. 3 a first embodiment of a wound stator with insulating lamella Fig. 4 a corresponding top view according to Fig. 3 Fig. 5 and Fig. 6 the embodiment according to Fig. 3 with attached wiring plate and Fig. 7 schematically the conductor elements of the circuit board without plastic body.

[0023] In Fig. Figure 1 schematically shows a cutaway stator 10, on whose stator teeth 14 the winding scheme of the electrical winding 16 according to the invention is shown. The stator 10 has, for example, twelve stator teeth 14, with exactly one partial coil 18 wound on each stator tooth 14. Two immediately adjacent partial coils 18 are connected by means of a short connecting wire 31 to form an adjacent partial coil pair 20, which in this embodiment each forms its own phase 26 V1, U1, W1, V2, U2, W2. The three phases 26 V1, U1, W1 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 second, separate winding wire 22 and is electrically insulated from the first winding strand 24, as shown by the dashed line between the sixth and seventh stator teeth 14 in Fig. Figure 4 illustrates this. For example, the electrical winding 16 begins with a first wire start 28 at the second stator tooth 14, 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 this partial coil pair 17 is connected by means of the short connecting wire 31 for the partial coil pair 17. After the sixth stator tooth 14, the winding wire 22 is led by means of the connecting wire 30 to the third stator tooth 14, in order to form a partial coil pair 17 there, connected by means of the connecting wire 31, together with the fourth stator tooth 14. From the fourth stator tooth 14, the winding wire 22 is led via the connecting wire 30 to the first stator tooth 14, where the wire end 29 of the first winding strand 24 is arranged immediately adjacent to the wire start 28.The second winding strand 25 is wound with a separate winding wire 22 in accordance with the winding of the first winding strand 24, so that three further partial coil pairs 17 are formed from immediately adjacent partial coils 18, which are connected by means of a short connecting wire 31. The wire start 28 and the wire end 29 of the two winding strands 24, 25 are each electrically connected to each other. In this way, six phases can be controlled separately.

[0024] This is the case, for example, for a delta connection in Fig. Figure 2 shows the first winding 24 with the three phases 26 V1, U1, W1 being completely electrically separated from the second winding 25 with the three phases 26 V2, U2, W2 (thus forming two separate delta connections). The six phases 26 are each energized via the short connecting wires 31, which are arranged between two adjacent partial coils 18 on immediately adjacent stator teeth 14. In the exemplary embodiment, the stator 10 has a total of 12 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, wound accordingly on 18 or 24 stator teeth 14.

[0025] In Fig. Figure 3 shows a spatial view of a stator 14, which is constructed according to the winding scheme from Fig. 1 is wound. The stator 14 has a stator body 34, which is composed, for example, of individual sheet metal laminations 36. The stator body 34 comprises an annular, closed back yoke 38, on which the stator teeth 14 are formed radially inwards. Inside, the stator 14 has a circular recess into which a rotor (not shown) can be inserted, as is better illustrated in Fig. As can be seen in Figure 4, the stator teeth 14 extend radially inwards in the direction 4 and axially along the rotor axis. In the exemplary embodiment, the stator teeth 14 are staggered in the circumferential direction 2 to reduce the cogging torque of the motor. For this purpose, for example, the laminations 36 are twisted relative to each other in the circumferential direction 2. Before the stator body 34 is wound, insulating laminations 40 are attached to both axial end faces 39 to electrically insulate the winding wire 22 from the stator body 34. At least one of the two insulating laminations 40 has an annularly closed circumference 41, from which insulator teeth 42 extend radially 4, covering the end faces 39 of the stator teeth 14. Guide elements 44 are formed on the annular circumference 41 of the insulating lamella 40, in which the connecting wires 30, 31 between the partial coils 18 are guided.For this purpose, for example, grooves 45 are formed on the outer circumference 41 in the circumferential direction 2, so that the connecting wires 30, 31 are arranged in axially offset planes to prevent the connecting wires 30, 31 from crossing over each other. The short connecting wires 31 between the partial coil pairs 17 are arranged in the uppermost axial plane, with all six short connecting wires 31 for contacting the phase terminals all running in the same axial plane. For this purpose, two axial extensions 46 are always formed between two partial coils 18 of a partial coil pair 17, which are separated from each other by an intervening radial opening 47. Thus, the short connecting wires 31 of the partial coil pairs 17 are freely accessible from all sides and, in particular in the area of ​​the radial opening 47, do not lie against the insulating lamella 40.In this embodiment, the two wire beginnings 28 and wire ends 29 are fixed in a labyrinth arrangement 50, each of which is arranged in the circumferential direction 2 directly adjacent to the two axial extensions 46, which are spaced apart by a radial opening 47. Thus, in . Fig. As can be seen in Figure 3, the wire start 28 of the first winding strand 24 runs parallel to and directly adjacent to the wire end 29 of the first winding strand 24 over the circumference of the radial opening 47. The wire start 28 is arranged 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 2 opposite the radial opening 47. This parallel arrangement of the short connecting wires 31 allows them to be electrically contacted for phase control in the same way as the individual connecting wires 31 of the wound partial coil pairs 17.

[0026] In Fig. Figure 4 also clearly shows that the two parallel connecting wires 31 are arranged on the same radius. The free ends of the wire start 28 and the wire end 29 terminate directly after the corresponding labyrinth arrangements 50, so that they do not project radially beyond the connecting wires 30, 31. The connecting wires 30, 31 all run circumferentially 2 along the guide elements 44 and lie radially outside the partial coils 18 wound on the stator teeth 14. Fig. Figure 4 shows the two motor halves 11, 13 schematically separated by the dashed line, with the left motor half 11 being electrically isolated from the right motor half 13. The electrical winding 16 is manufactured, for example, by means of needle windings, whereby the connecting wires 30, 31 between the partial coils 18 can be guided radially outwards by means of a winding head and laid down in the guide elements 44. In this embodiment, all connecting wires 30, 31 are arranged axially on one side of the stator body 34. In an alternative embodiment, not shown, it is also possible to route some of the connecting wires 30, 31 to the axially opposite side of the stator 14.For example, the short connecting wires 31 for contacting the phase control can be arranged in a first insulating lamella 40, and the other connecting wires 30, which connect the various partial coil pairs 17 to each other, can be guided on the axially opposite insulating lamella 40.

[0027] In Fig. 5 refers to the design of the stator 10 according to Fig. 3 A connection plate 52 is mounted, by means of which the electrical winding 16 is controlled. For this purpose, the connection plate 52 has connector plugs 54 onto which customer-specific connecting plugs 56 of a control unit can be attached. In this embodiment, exactly six connector plugs 54 are arranged, each of which is electrically connected to a phase 26 of the electrical winding 16. Here, each phase 26 is formed by exactly one partial coil pair 17, so that the six connector plugs 54 are contacted by exactly six connecting wires 31 from adjacent partial coil pairs 17. For this purpose, the connection plate 52 has exactly six conductor elements 58, which have the connector plugs 54 at one axially angled end and a mounting section 60 at the other end, which is electrically connected to the connecting wires 31 – for example, by welding.The terminal block 52 has a plastic body 62, which is designed as a closed ring 61 through which the rotor can be inserted into the stator 10. Retaining elements 63 are integrally formed on the plastic body 62 and extend axially 3 away from the stator body 34. The conductor elements 58 extend circumferentially 2 along the plastic body 62, with the angled connecting plugs 54 guided axially 3 within the retaining elements 63. At their other end, the conductor elements 58 have the fastening section 60, the free end of which is designed as a loop 64 that encloses the connecting wires 31. The loop 64 is formed from a sheet metal material with an approximately rectangular cross-section.In the exemplary embodiment, the conductor elements 58 are formed as die-cut parts 59 from sheet metal, so that the loop 64 from the free end of the fastening section 60 can be bent around the connecting wire 31 during its assembly. After the open loop 64 has been arranged around the connecting wire 31, electrodes are applied, for example, to both radially opposite surfaces of the loop 64. These electrodes are pressed together radially while they are energized to weld the loop 64 to the connecting wire 31. This melts the insulating varnish of the connecting wire 31, resulting in a metallic bond between the fastening section 60 and the connecting wire 31. The loop 64 is placed around the connecting wire 31 in the area of ​​the radial opening 47, since no guide element 44 is arranged between the connecting wire 31 and the loop 64 in this area.This provides sufficient clearance for the electrodes, allowing a free leg end 65 of the loop 64 to be pressed against the fastening section 60, thus closing the loop 64. Depending on the partial coil pair 17, the loop 64 encloses either a single connecting wire 31 or simultaneously two parallel connecting wires 31, which are formed from the wire start 28 and wire end 29 of a single winding strand 24, 25. The connecting plugs 54 are designed, for example, as insulation displacement connectors 55, which have a notch 69 at their free axial end 68 into which a wire or a clamping element of the corresponding customer connector 56 can be inserted. Furthermore, a transverse web 70 is formed on the connecting plug 54 in the radial direction 4, which is supported accordingly against an axial stop 72 of the retaining element 63.Furthermore, a first guide surface 74 and a second guide surface 75 are formed on the retaining element 63, which support the connecting plug 54 in both opposite circumferential directions 2. This prevents the connecting plugs 54 from bending or folding over in circumferential direction 2 when the connecting plugs 56 are inserted, thus ensuring the axial tolerance of the plug connection.

[0028] The conductor elements 58 are arranged radially adjacent to one another, at least partially, necessitating that the fastening sections 60 of the inner conductor elements 58 radially cross the outer conductor elements 58 in order to be contacted by the connecting wires 31. Therefore, the radially inner conductor elements 58 are arranged on an axially higher surface 76 of the plastic body 62, and the radially outer conductor elements 58 on an axially lower surface 77. The central sections 78 of the conductor elements 58, designed as sheet metal strips, lie flat against the plastic body 62 and are connected to it, for example, by means of rivet connections or snap-fit ​​elements. For this purpose, axial rivet pins 79 are formed on the plastic body 62, which extend through corresponding axial openings 80 in the conductor elements 58.By means of heat - especially ultrasound - the ends of the rivet bolts can be formed into a rivet head 81, which forms a positive connection with the conductor elements 58.

[0029] In the exemplary embodiment, two connector plugs 54 are always arranged in a common retaining element 63, being separated from each other in the circumferential direction 2 by a central web 82 of the retaining element 63. The central web 82 forms a first and second guide surface 74, 75 on each side for the respective adjacent connector plugs 54. The second and first guide surfaces 75, 74 opposite the central web 82 are formed by corresponding counter surfaces 83 extending in the radial direction 4 and axial direction 3. Spacers 84 are integrally formed in the area of ​​the retaining elements 63 – axially opposite them – which support the interconnection plate 52 axially against the stator body 34. In the exemplary embodiment of the Fig. 5 and Fig. In section 6, exactly one retaining element 63 has a greater width 85 in the circumferential direction 2 than the other two retaining elements 63. This creates an anti-rotation device for a bearing cover (not shown), which is axially fitted onto the retaining elements 63 with correspondingly shaped axial through-holes.

[0030] Fig. Figure 6 shows how the two connecting plugs 54 rest against the central web 82 on both sides. The respective central section 78 of the conductor element 58, angled in opposite circumferential directions 2, connects to the connecting plug 54. Since the radially adjacent conductor elements 58 are arranged on axially different tracks 76, 77, they do not touch, thus providing electrical insulation from each other. The inner ring of the plastic body 62 is slightly corrugated to allow a punch tool to be applied directly to the side surfaces at the inner ends of the stator teeth 14. This enables the stator 10 to be pressed into a motor housing (not shown).

[0031] In Fig. Figure 7 shows the six conductor elements 58 again without the plastic body 62 of the connection plate 52, to illustrate how the six fastening sections 60 with the respective loops 64 connect the six phases 26 V1, U1, W1, V2, U2, W2 according to the winding scheme of the Fig. 1. Power is supplied via the respective connection plugs 54. The electrical winding 16 is thus contacted via the connection plugs 56 (not shown) with a control unit, in which, for example, the wiring according to Fig. 2 can be realized.

Claims

[1] Stator (10) for an electric machine (12), comprising a stator body (34) having radial stator teeth (14), each stator tooth (14) accommodating exactly one partial coil (18) of an electric winding (16), the winding (16) consisting of exactly two separate winding strands (24, 25) wound from exactly two separate winding wires (22), each having three phases (26) with at least two partial coils (18, 17), wherein an insulating lamella (40) is arranged on each of the axial end faces (39) of the stator body (34), and at least one of the two insulating lamellae (40) is closed at its outer circumference (41) and has guide elements (44) for connecting wires (30, 31) between the individual partial coils (18) which are arranged in axially different planes, wherein the wire beginnings (28) and the wire ends (29) of the first and second winding strand (24,25) are each fixed in labyrinthine shapes (50) of the insulating lamella (40), wherein a wire start (28) and a wire end (29) of the same winding strand (24, 25) are arranged parallel to each other over a certain circumferential area (47), so that they can be contacted together with a conductor element (58) of a connection plate (52). [2] Stator (10) according to claim 1, characterized by , that the stator body (34) has an outer closed return ring (38) from which the stator teeth (14) extend radially inwards - wherein preferably exactly twelve stator teeth (14) are arranged. [3] Stator (10) according to claim 1 or 2, characterized by , that the first winding strand (24) extends circumferentially (2) over the first half (11) and the second winding strand (25) over the second half (13) of the stator body (34), so that two electrically insulated motor halves (11, 13) are formed. [4] Stator (10) according to any one of the preceding claims, characterized by , that the stator body (34) is assembled from a plurality of superimposed stator lamellae (36) to form a lamella pack (35). [5] Stator (10) according to any one of the preceding claims, characterized by , that two adjacent partial coils (18) are directly connected to each other by means of a wound connecting wire (31) to form a partial coil pair (17). [6] Stator (10) according to any one of the preceding claims, characterized by , that the individual stator lamellae (36) are twisted relative to each other in the circumferential direction (2) in such a way that they form interlocking stator teeth (14). [7] Stator (10) according to any one of the preceding claims, characterized by, that different interconnection plates (52) can be attached in a modular design to the at least one insulating lamella (40) with the connecting wires (30, 31) arranged on it, which provide customer-specific connection plugs (54) for the power supply or different interconnections of the individual phases (26) or partial coils (18). [8] Stator (10) according to any one of the preceding claims, characterized by , that the interconnection plate (52) has a closed ring (61) which is arranged radially within the closed circumference (41) within the guide elements (44) of the insulating lamella (40) and has an inner opening (37) through which a rotor can be inserted axially into the stator (10). [9] Stator (10) according to any one of the preceding claims, characterized by, that the closed ring (61) is designed as a plastic body (62) on which retaining elements (63) for the axial connecting plugs (54) are formed in the axial direction (3), which are formed integrally with conductive elements (63) that can be electrically connected to the connecting wires (30, 31). [10] Stator (10) according to one of claims 1 or 2 or 4-9, characterized by , that each phase (26) of the first winding strand (24) is connected to the corresponding phase (26) of the second winding strand (25) together with a connector (54), so that a total of exactly three connectors (54) are formed on the connection plate (52). [11] Stator (10) according to any of the preceding claims, characterized by , that each individual phase (26) is individually connected to a connector (54), so that a total of exactly six connectors (54) for six phases (26) are provided on the connection plate (52). [12] Stator (10) according to any of the preceding claims, characterized by , that two connecting plugs (54) are arranged adjacent to each other on a common holding element (63), wherein the two connecting plugs (54) are each electrically connected to only one phase (26) - consisting of an adjacent partial coil pair (17) - which are located radially opposite each other in the stator body (34). [13] Stator (10) according to any one of the preceding claims, characterized by , that the conductor elements (58) are arranged radially next to each other on the interconnection plate (52) and are fixed to the plastic body (62) by means of hot riveting or snap-fit ​​elements, wherein the conductor elements (58) are designed as bent stamping parts (59) whose angled ends (68) are designed as insulation displacement connections (55) to form the connector plugs (54). [14] Electric machine with a stator (10) according to one of the preceding claims, characterized by, that the stator (10) is inserted into a cylindrical motor housing, and bearing shields which support a rotor shaft of the rotor axially close the motor housing - wherein through-passages for the retaining elements (63) of the connecting plugs (54) are formed on a bearing cover. [15] Method for manufacturing a stator according to any one of claims 1-13, characterized by , that by means of needle winding a first winding strand (24) with three phases (26) is wound in the first half (11) of the stator body (34), and then with a second, separate winding wire (22) the second winding strand (25) with three phases (26) is wound in the second half (13) of the stator body (34), wherein the wire beginnings (28) and the wire ends (29) of the two separate winding wires (22) are each attached in an insulating lamella (40) axially abutting the stator body (34).

Images