DE102023212506A1 - Stator for an electrical machine, as well as an electrical machine comprising a stator, and method for producing a stator - Google Patents

Abstract

Stator (10), in particular for an electrical machine (12), an electrical machine (12), and a method for producing a stator (10), with a stator base body (13) which has a yoke region (14) from which stator teeth (16) extend inwards in the radial direction (7), wherein an electrical winding (42) is arranged on the stator teeth (16), wherein wire ends (44) of the electrical winding (40) are electrically connected to conductor elements (54) of a wiring arrangement (50), wherein the conductor elements (54) extend radially outside the stator base body (13) in the circumferential direction (9).

Description

The invention relates to a stator for an electrical machine, as well as to an electrical machine comprising a stator, and to a method for producing a stator according to the preamble of the independent claims.

State of the art

The DE 10 2015 200 086 A1 describes a stator manufacturing method in which single-tooth coils are wound with a continuous winding wire across several stator teeth. Connecting wires between the individual coils are stretched circumferentially between axial extensions of the insulating mask. For electrical interconnection of the single-tooth coils, they are electrically connected to conductor elements at the connecting wires. The conductor elements have connection pins at one end for electrical connection. At the other end, a welding hook is formed on the conductor elements, which encloses the tangential connecting wires of the coils and is welded to them. In this design, the conductor elements are combined to form a wiring plate that is arranged axially directly above the electrical coils. This wiring plate requires axial installation space in the electrical machine, which is not available in all applications. In addition, a large amount of free space must be provided for the positioning of the welding gun to make contact with the connecting wires during assembly. The design according to the invention is intended to eliminate these disadvantages.

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 have the advantage that the overall axial height of the electrical machine can be significantly reduced by arranging the conductor elements of the interconnection device radially outside the stator base body, axially overlapping with the electrical winding. Although the annular arrangement of the interconnection device around the stator base body requires a larger radial installation space for the stator, this does not represent a major limitation for certain applications if it allows the axial length of the electrical machine to be significantly reduced.

The measures listed in the dependent claims enable advantageous further developments and improvements of the embodiments specified in the independent claims. It is particularly advantageous if the conductor elements of the interconnection arrangement do not protrude axially beyond the electrical winding or axially beyond the insulating mask. The electrical winding wound on the insulating mask forms a so-called winding head at both axial ends of the stator base body, the axial height of which is predetermined by the active parts of the electrical machine. If the interconnection arrangement is arranged axially in the area of the winding heads and/or the stator base body, no additional axial installation space is required that is not already predetermined by the active parts.

The interconnection arrangement is arranged in a ring shape outside the outer diameter of the stator base body, with its circumferential angle being in particular at least 180°. Several individual conductor strips are arranged in a ring shape within the interconnection arrangement, the individual circumferential angles of which at least partially overlap with one another. As a result, the entire interconnection arrangement preferably extends over the entire angular range of approximately 180° to 270°.

Particularly advantageously, the stator base body is inserted axially into a stator housing that also extends axially over the two winding overhangs. To enable electrical contact between the winding wire ends and the wiring arrangement arranged radially outside the stator housing, radial openings are cut out in the cylindrical wall of the stator housing through which the wire ends are guided in the axial region of the insulation mask and/or the winding overhang in the radial direction. For example, exactly three radial openings can be arranged, each spaced approximately 120° apart. With this design, the stator housing, which is used in conventional EC motors, can be adapted with very little effort to the wiring device arranged radially outside the stator housing.

The conductor strips of the interconnection arrangement can be punched and bent very cost-effectively as stamped and bent parts, on which contact elements are formed that can be electrically connected directly to the wire ends of the electrical coils. This electrical connection can be established by hot stacking, soldering, or welding—especially laser welding. Due to the exposed position of the contact elements radially outside the stator base body, the contacting process can be carried out with virtually no space restrictions.

The conductor elements can be punched out of a metal sheet as sheet metal strips, so that their cross-section is approximately rectangular. These sheet metal strips are arranged in a ring around the stator base body, with the longer side of the cross-section being able to be aligned either axially or radially. The ring-shaped conductor strips are then stacked on top of one another in the axial direction or arranged next to one another in the radial direction.

For this purpose, the interconnection arrangement has a ring-shaped plastic support that accommodates the conductor elements. The bent stamped parts can be pressed or clipped into the prefabricated plastic support. Alternatively, the bent stamped parts can also be overmolded with the plastic of the ring-shaped support component. This reliably insulates the conductor elements from each other and ensures their mechanically secure positioning.

Particularly advantageous is the use of integrally formed retaining elements on the annular plastic support, which extend radially inward from the plastic ring to the stator base body. These retaining elements can be supported on the insulation mask and/or directly on the stator base body and can optionally be locked to these, thereby reliably mechanically fixing the interconnection arrangement to the stator base body. For example, three retaining elements can be molded around the circumference as radial extensions, which can also be used as guides for the wire ends directed radially outward.

The radial extensions of the holding elements preferably extend radially through the radial openings in the stator housing, whereby the radially inner ends of the radial extensions can be clamped, for example, to the insulating mask or to the stator base body or to the inside of the stator housing wall. An insulating plate can also be arranged between the winding head and the bearing cover, to which the holding elements of the wiring arrangement can also be fastened. The wire ends of the electrical winding can be guided radially outwards from the insulating mask, via the radial extensions of the holding elements radially outwards to the annular plastic carrier. For this purpose, receptacles can be formed in the radial extensions, into which the wire ends are inserted axially from above. The wire ends are then guided radially out to the contact elements of the conductor elements, which protrude in particular axially and/or radially from the plastic carrier. The contact elements can, for example, have contact forks into which the wire ends can be inserted and then firmly electrically contacted.

In order to precisely position the interconnection arrangement relative to the stator base body, arcuate guide webs are preferably formed on the radially inner ends of the axial extensions of the holding elements, said guide webs extending in the circumferential direction along the inside of the stator housing. These arcuate guide webs can be very easily clamped radially between the upper insulating mask and the inside of the stator housing wall. For example, locking elements can be formed on the arcuate guide webs, which interact with counter-locking elements on the insulating mask and/or the stator base body. In particular, the locking elements can be pressed axially into corresponding receiving elements on the outer circumference of the insulating mask or the stator base body. The locking elements can preferably be formed integrally with the arcuate guide webs and integrally with the axial extensions of the holding elements and integrally with the annular plastic carrier. The curved guide webs can also be connected to each other in the circumferential direction so that they extend integrally over a large part of the circumference or as a closed circular ring within the stator housing

Preferably, three or four separate conductor elements are arranged in the plastic carrier of the wiring arrangement, which connect the single-tooth coils to form a star connection or a delta connection of the electrical machine. Preferably, exactly three electrical phases are formed, which comprise, for example, exactly two or three or four or six single-tooth coils. A connection plug is formed on the ring-shaped plastic carrier, in which the plug contacts of the electrical conductor elements are arranged. This connection plug can be contacted with corresponding pins, which are connected to the control electronics via an electrical connecting cable. The pins can be inserted into the connection plug axially from above, axially from below, or in the radial direction, or in the tangential direction.

In an alternative design, the stator housing in the axial area of the interconnection arrangement is not arranged radially inside the conductor elements, but radially outside the conductor elements. For this purpose, the stator housing has a radial widening in the axial area of the interconnection arrangement, which encloses the entire interconnection arrangement over its entire circumference. As a result, the interconnection arrangement is particularly well protected by the metal stator housing. In this design, the plastic carrier is also fixed directly to the stator base body or to the insulation mask via the radial retaining elements, whereby No radial openings through the stator housing are necessary.

The stator is preferably used in an electrical machine, for example, an electronically commutated EC motor. The stator is composed in particular of individual T-shaped stator segments, which are joined together to form the closed stator ring after winding. A rotor is arranged radially inside the stator and is mounted in the stator housing by means of a bearing cover. The interconnection arrangement does not protrude beyond the bearing cover, particularly in the axial direction, so that the stator housing can be flange-mounted directly, for example, to a gearbox housing. The rotor shaft protrudes, for example, through the bearing cover and, with an output element, into the gearbox housing. The electrical winding of the stator is composed of single-tooth coils, which are controlled by the control electronics of the electrical machine. For this purpose, the single-tooth coils are connected to the electronics unit via the conductor elements and their plug contacts. The electronics unit is preferably positioned axially above the electrical winding. The individual stator segments preferably each have individual insulating masks. For example, a first insulating shell is placed axially from above and a second insulating shell is placed axially from below on the stator segment. The insulating masks cover the stator tooth on the one hand and project radially beyond it into the yoke area. In the yoke area, axial extensions are formed on the insulating masks through which, for example, the wire ends of the single-tooth coils are bent radially outwards. When winding the stator teeth, for example, several single-tooth coils - in particular 2 or 3 or 4 - are wound using a continuous winding wire (or a double winding), whereby in particular two wire ends that are led out on a single holding element form the beginning and/or the end of a single electrical phase.

According to the manufacturing method according to the invention, the stator teeth are first wound with the electrical winding, with the free wire ends of the coils projecting axially upwards. To form the interconnection arrangement, the plastic carrier with the holding elements is placed on the stator base body such that the conductor elements are arranged radially outside the outer circumference of the stator base body. The free wire ends are then inserted into guides of the holding elements and electrically connected to contact elements of the conductor elements. Since the contact elements are freely accessible, the electrical contact can be formed very inexpensively by hot stacking (hot stamping) or by welding, for example by using welding tongs to thermally connect the contact elements to the wire ends.

The stator base body can be inserted axially into the stator housing after the interconnection arrangement has been connected to the stator base body, or alternatively, the wound stator base body can be inserted into the stator housing first, and only then can the interconnection arrangement be connected to the stator base body. In this case, the curved guide elements of the retaining elements can be clamped radially between the inner wall of the stator housing and the insulating mask and/or stator base body. The retaining elements are then connected to the stator base body directly or indirectly via the insulating mask and/or an insulating plate attached above the winding head.

Short description of the drawings

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

• 1 schematisch eine erste Ausführung einer erfindungsgemäßen elektrischen Maschine,
• 2 eine weitere Ausführung einer erfindungsgemäßen elektrischen Maschine ohne Statorgehäuse,
• 3 und 4 zwei weitere Teildarstellungen der Ausführung gemäß 2, und
• 5 ein weiteres Ausführungsbeispiel einer elektrischen Maschine mit einem erfindungsgemäßen Stator.

They show:

• 1 schematically shows a first embodiment of an electrical machine according to the invention,
• 2 a further embodiment of an electrical machine according to the invention without a stator housing,
• 3 and 4 two further partial representations of the execution according to 2 , and
• 5 another embodiment of an electrical machine with a stator according to the invention.

In 1 A section through an electrical machine 10 is shown, such as is used for a brake unit in a motor vehicle. The electrical machine 10 has a stator 10, in which a stator base body 13, which carries an electrical winding 42, is inserted into a stator housing 11. The electrical winding 42 projects axially beyond the stator base body 13 with winding heads 46 at both ends. The stator base body 13 is inserted into a cylindrical wall 15 of the stator housing 11. In the axial region of one of the two winding heads 46, wire ends 44 of the electrical winding 42 are guided out of the stator housing 11 in the radial direction 7, where they are electrically connected to a wiring arrangement 50. The wiring arrangement 50 has a plastic carrier 52, in which several conductor elements 54 are inserted. The plastic carrier 52 extends with the conductor elements 54 over a circumferential angle 92 of preferably more than 180° around the stator base body 13 - and in particular also around the stator housing 11. The wire ends 44 are electrically connected to contact elements 57 of the conductor elements 54, wherein the conductor elements 54 form plug contacts 65 for a connection plug 66 arranged on the plastic carrier 52. For example, the electrical winding 42 is connected to three electrical phases U, V, W by means of a star connection or a delta connection. Electrical lines 68 lead from the connection plug 66 to control electronics 20 arranged in an electronics housing 24. The control electronics 20 has, for example, an electronics circuit board 23 on which electronic components 25 for the electronic commenting of the electrical winding 42 are arranged. In this embodiment, the stator housing 11 and the annular interconnection arrangement 50 are arranged within a housing 80 of the electric machine 10, which is a component of a brake unit. The electronics housing 24 is arranged axially above the stator base body 13, opposite the interconnection arrangement 54. A rotor 70 (not shown in detail) is arranged within the stator base body 13 by means of rotor bearings 71, 69, with a first rotor bearing 71 being arranged in a bearing cover 72 that closes off the axially open stator housing 11. Axially opposite, on a base 78 of the stator housing 11, a second rotor bearing 69 is arranged, which receives the rotor shaft 74. The stator housing 11 is flanged axially to a gear housing 22 on the axial side of the bearing cover 72 by means of a stator flange 17, which can be designed, for example, as a hydraulic block for a hydraulic pump. On the axially opposite side, the rotor shaft 72 can optionally protrude axially through the second rotor bearing 69 and extend as far as the control electronics 20. For example, a signal transmitter 81 can be arranged on the rotor shaft 74, which interacts with a rotor position sensor 82, which is a component of the control electronics 20 and is arranged in particular on the electronics circuit board 23. The housing 80 of the electric machine 12 can, for example, be formed integrally with the electronics housing 24, wherein the electronics circuit board 23 can be inserted into the electronics housing 24 and then tightly closed with an electronics cover 27. The electronics circuit board 23 has an electrical connection to the stator housing 11, in particular for forming a ground contact 28.

2 shows a further exemplary embodiment in which the interconnection arrangement 54 is arranged in the axial region of the stator base body 13 and/or the winding overhang 46. A design is also conceivable in which the plastic carrier 52 is arranged completely within the axial extent of the stator base body 13. In this design, the stator housing 11 is not shown in order to better see the fixing of the interconnection arrangement 50 to the stator base body 13. In a variant not shown, the stator housing 11 can have a radial widening in the axial region of the interconnection arrangement 50, so that the interconnection arrangement 50 arranged radially outside the stator base body 13 is arranged radially within the radial widening of the stator housing 11 and is enclosed by the radial widening over the entire circumference. The stator base body 13 has a radially outer yoke region 14, from which stator teeth 14 extend inward in the radial direction 7. An insulating mask 30 is arranged on the stator teeth 14, which electrically insulates the electrical winding 42 from the stator base body 13. The insulating mask 30 has guide elements 32 in the axial region of the winding heads 46, along which the winding wire 41 is guided between various single-tooth coils 40 of the electrical winding 42. In this case, several single-tooth coils 40 can also be wound through using a continuous winding wire 41. The wire ends 44 of the electrical winding 42 can also be fixed in the guide elements 32 of the insulating mask 30 and bent radially outward toward the interconnection arrangement 50. Formed onto the plastic body 52 are retaining elements 58 which extend inward in the radial direction 7 and are supported on the insulating mask 30 and/or the stator base body 13. For this purpose, arcuate guide webs 60 are formed on the retaining elements 58, on which clamping or locking elements 62 are preferably arranged, by means of which the interconnection arrangement 50 is firmly fixed to the stator base body 13. The locking elements 60 engage, for example, in counter-locking elements 63 on the insulating mask 30. The arcuate guide webs 60 are preferably arranged radially within the cylindrical wall 15 of the stator housing 11, with the arcuate guide elements 60 and/or the locking elements 62 clamping the retaining elements 58 between the cylindrical wall 15 and the insulating mask 30 and/or the stator base body 13. The wire ends 44 are received in receptacles 59 of the holding elements 58 and guided radially through the radial openings 18 in the wall 15 of the stator housing 11. In 2 Contact elements 57 are formed at the free ends of the conductor elements 54, to which the wire ends 44 can be electrically contacted, for example by means of hot stacking or by means of welded connections 97. In particular, the contact elements 57 are designed as contact forks 98, into which the wire ends 44 are inserted and clamped or pressed in or connected to it by means of a material fit. In the embodiment example of the 2 Exactly six wire ends 44 are led radially outwards to the conductor elements 54, with the connection plug 66 having exactly three phases U, V, W for supplying current to the - in particular twelve - single-tooth coils 40. A rotor 70 is mounted in the stator 10 by means of the rotor bearings 71, 69, with the rotor shaft 74 projecting in the axial direction 8 through the first rotor bearing 71. On the rotor shaft 74 projecting from the stator housing 11, a gear worm, for example, is arranged as an output element 76, which meshes with a corresponding gear element arranged in the gear housing 22.

In 3 the ring-shaped interconnection arrangement 50 is made of 2 with an axially open plastic carrier 52. Here, the conductor elements 54 are axially inserted into the shell-shaped plastic carrier 52. The conductor elements 54 are designed as stamped and bent parts 56, in which sheet metal strips 55 extend over a specific circumferential angle 92 around the stator base body 13. The sheet metal strips 55 are arranged here, for example, axially one above the other - electrically insulated from one another. The contact elements 57 protrude from the sheet metal strips 55 in the axial direction 8 and are then bent in the radial direction 7 towards the insulating mask 30. The contact elements 57 are preferably arranged in the circumferential region of the holding elements 58, so that the wire ends 44 in the receptacles 59 of the holding elements 58 are guided directly to the contact elements 57 and are electrically contacted thereon. The receptacles 59 are designed here, for example, as radial slots in the curved guide elements 60. The holding elements 58 are designed as radial extensions 99 that extend radially inward toward the insulating mask 30. The arcuate guide elements 60 are then arranged on the radial inner side of the radial extensions 99, from which the locking elements 62 extend axially downward. In this embodiment, one of the conductor elements 54 is designed as a star point 94 that electrically connects all phases U, V, and W. The three other conductor elements 54 each have the plug contact 65 of the connection plug 66 at their free end opposite the contact element 57. The connection plug 66 is designed here, for example, as a tangential extension 67 on the plastic carrier 52, wherein the pins of the electrical connection lines 68 can be inserted into the connection plug 66, for example, in the axial direction 8. The plug contacts 65 can be designed as spring contacts projecting in the axial direction 8, into which the pins of the electrical connecting lines 68 can be clamped. If the conductor elements 54 are clamped or clipped into the shell-shaped plastic carrier 52, the plastic carrier 52 can then be closed with a plastic cover if necessary. The plastic carrier 52 extends over a circumferential angle 92° over 180°, preferably over 270°.

In 4 the conductor elements 54 are designed according to the design in 2 without plastic carrier 52 in order to be able to clearly see their geometric arrangement. According to the 3 the conductor elements 54 are arranged axially spaced one above the other and all overlap with the axial regions of the insulating mask 30 and/or the stator base body 13. The annular sheet metal strips 55 of the conductor elements 54 here have a rectangular cross-section 53, the dimension 48 of which in the radial direction 7 is larger than their dimension 49 in the axial direction 8. The contact elements 57 of the conductor elements 54 protrude from the annular sheet metal strips 55 in the axial direction 8 towards the first rotor bearing 71. In this case, the conductor elements 54 do not extend beyond the bearing cover 72 (not shown) in the axial direction 8, so that the electrical machine 10 can be optimally shortened in the axial direction 8 by the circuit arrangement 50 arranged in a ring around the stator base body 13, which axially overlaps the insulating mask 30 and/or the stator base body 13. In this embodiment, all wire ends 44 are arranged at one axial end of the stator base body 13 on the same insulating mask 30. In an alternative embodiment, the conductor elements 54 can also be overmolded as inserts of the plastic carrier 52, as shown by way of example in 5 is shown.

In 5 the stator housing 11 is designed as an axially open pot, which is closed with the bearing cover 72. The first rotor bearing 71, through which the rotor shaft 74 projects axially from the stator housing 11, is fastened in the bearing cover 72. The output element 76, which interacts with a corresponding gear component in the gear housing 22, is again arranged on the free end of the rotor shaft 74. The output element 76 interacts with a corresponding gear component in the gear housing 22. The stator housing 11 has radial openings 18 through the cylindrical wall 15 in the circumferential regions where the holding elements 58 of the plastic carrier 52 are arranged. This allows the holding elements 58 to project radially into the stator housing 11 up to the insulation mask 30. Thus, with the radial extension 99 of the holding element 58, the wire ends 44 of the electrical winding 42 are also guided through the radial openings 18. The arcuate guide elements 60, which are formed on the radially inner ends of the holding elements 58, then extend along the inner side of the cylindrical wall 15 in the circumferential direction 9 beyond the tangential extent of the radial openings 18. The holding elements 58 have cover plates 61 that cover the radial openings 18 in the cylindrical wall 15. The The interconnection arrangement 50 is designed here as an injection-molded component in which the bent stamped parts 56 of the conductor elements 54 are overmolded over the entire circumferential area of the interconnection arrangement 50. The contact elements 57 protrude axially from the plastic carrier 52 to electrically contact the wire ends 44. Likewise, the plug contacts 65 of the conductor elements 54 are free of the overmolded plastic so that they can be contacted with the pins of the electrical connection lines 68 of the control electronics 20 in the connection plug 66.

It should be noted that, with regard to the exemplary embodiments shown in the figures and in the description, a wide variety of combinations of the individual features are possible. For example, the plastic ring 52 of the interconnection arrangement 50 can have a different contour, in particular be square or round. The number and geometry of the conductor elements 54 and their contact elements 57 can be adapted to the number of single-tooth coils 40. For example, the conductor strips 55 can also be arranged radially next to one another, with their axial extent 49 then being greater than their radial extent 48. Likewise, the design of the holding elements 58 and the insulating mask 30 - and in particular their mechanical connection to the stator base body 13 - can be varied. The stator 10 is preferably composed of individual T-shaped stator segments, each of which has a radially outer yoke region 14, from which a stator tooth 16 extends inward in the radial direction 7. The stator base body 13 is composed of axially stacked sheet metal laminations, which are preferably punched out. Insulating masks 30 are placed on each of the individual stator segments, onto which the single-tooth coils 40 are wound. The invention is particularly suitable for the rotary drive of components or for the adjustment of parts in motor vehicles, but is not limited to this application.

QUOTES CONTAINED IN THE DESCRIPTION

This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10 2015 200 086 A1 [0002]

Claims (14)

Stator (10) - in particular for an electrical machine (12) - with a stator base body (13) which has a yoke region (14) from which stator teeth (16) extend inwards in the radial direction (7), wherein an electrical winding (42) is arranged on the stator teeth (16), wherein wire ends (44) of the electrical winding (40) are electrically connected to conductor elements (54) of a wiring arrangement (50), wherein the conductor elements (54) extend radially outside the stator base body (13) in the circumferential direction (9). Stator (10) after Claim 1 , characterized in that the electrical winding (42) projects axially beyond the stator base body (13) and forms a winding head (46) of the stator (10), and the conductor elements (54) are arranged in the axial direction (8) overlapping with the winding head (46) and/or with the stator base body (13). Stator (10) after Claim 1 or 2 , characterized in that the interconnection arrangement (50) with the conductor elements (54) extends in the form of a ring segment over an angular range (92) of more than 180° - in particular of approximately 270° - around the stator base body (13). Stator (10) according to one of the preceding claims, characterized in that the interconnection arrangement (50) with the conductor elements (54) is arranged radially outside a stator housing (11) made of metal, in which the stator base body (13) is axially inserted, wherein radial openings (18) are formed in particular in the stator housing (11), through which wire ends (44) of the electrical winding (42) are led out radially to the conductor elements (54). Stator (10) according to one of the preceding claims, characterized in that the conductor elements (54) are designed as bent stamped parts (56), and the wire ends (44) are electrically connected to the conductor elements (54) radially outside the stator base body (13) - in particular by means of hot stacking or by means of a welded connection (97). Stator (10) according to one of the preceding claims, characterized in that the conductor elements (54) are designed as sheet metal strips (55) with a rectangular cross-section (53), wherein the sheet metal strips (55) are arranged one above the other in the axial direction (8) or next to one another in the radial direction (7) in the interconnection arrangement (50). Stator (10) according to one of the preceding claims, characterized in that the interconnection arrangement (50) has an annular plastic carrier (52) into which the conductor elements (54) are inserted - in particular are overmolded with the plastic carrier (54). Stator (10) according to one of the preceding claims, characterized in that radially inwardly projecting holding elements (58) are formed on the annular plastic carrier (52) and fix the interconnection arrangement (50) to the stator base body (13). Stator (10) according to one of the preceding claims, characterized in that an insulating mask (30) is arranged on the stator base body (13), which projects axially beyond the stator base body (13), and single-tooth coils (40) are wound on the insulating mask (30) as the electrical winding (42), wherein the wire ends (44) are inserted into receptacles (59) of the holding elements (58), and the wire ends (44) are guided from the insulating mask (30) with the holding elements (58) through the radial openings (18) in the stator housing (11) radially outwards to the conductor elements (54). Stator (10) according to one of the preceding claims, characterized in that the holding elements (58) have arcuate guide webs (60) which extend radially inside the stator housing (11) in the circumferential direction (9) - and in particular on the guide webs (60) locking elements (62) are formed which fasten the plastic carrier (52) to the insulating mask (30). Stator (10) according to one of the preceding claims, characterized in that the - in particular exactly three or four - conductor elements (54) form a delta connection or a star connection, and a connection plug (66) for the electrical connection (68) - of preferably three phases - with control electronics (20) is formed on the plastic carrier (52) radially outside the stator base body (13). Stator (10) according to one of the preceding claims, characterized in that the stator housing (11) has a radial widening (91) in the axial region of the plastic carrier (52), so that the plastic carrier (52) is received in the radial widening (91) and is arranged radially within a peripheral wall (15) of the stator housing (11). Electrical machine (12) with a stator (10) according to one of the preceding claims, wherein within the stator (10) a rotor (70) is mounted by means of a bearing cover (72) which axially closes the stator housing (11) and the circuit arrangement (50) is connected via the connection plug (66) to an electronic control unit (20), by means of which the single-tooth coils (40) are electrically mechanically commutable - and in particular a rotor shaft (74) of the rotor (70) with an output element (76) extends axially outwards through the bearing cover (72), and a gear housing (22) for receiving the output element (76) is flanged to the stator housing (11). Method for producing a stator (10), in particular according to one of the preceding claims, characterized by the following method steps: - Winding the stator base body (13) with single-tooth coils (40), wherein a plurality of free wire ends (44) protrude in the axial direction (8) from the single-tooth coils (40) - Axial placement of the interconnection arrangement (50) on the wound stator base body (13) in such a way that the radially inwardly projecting holding elements (58) of the plastic carrier (52) are fastened to the stator base body (13) - Bending the axially upwardly projecting wire ends (44) radially outwards and electrically contacting the free wire ends (44) with the conductor elements (54) - in particular by means of hot stacking or welding - Preferably axially joining the stator base body (13) in the stator housing (11) made of metal - before or after the interconnection arrangement (50) has been connected to the stator base body (13).

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