Stator and method for producing a stator
Patent Information
- Application Number
- EP2023813559
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-12-19
- Filing Date
- 2023-11-20
- Publication Date
- 2025-10-29
AI Technical Summary
The production of stators for electrical machines, particularly in motor vehicle drive trains, faces challenges such as high costs and inefficiencies in electrical isolation, fixation, and sealing, which are typically addressed through costly processes like clinching, gluing, baking varnish, and welding.
A stator with a plastic injection molded element integrated into the stator body, providing functions like fixation, insulation, and sealing, which replaces the need for separate components like insulating paper and slot closure wedges, and allows for fluid cooling and thermal decoupling.
This approach simplifies the manufacturing process, reduces costs, and enhances the reliability of stator production by integrating multiple functions into a single component, improving insulation and sealing while allowing for efficient thermal management.
Smart Images
Figure 1.1
Abstract
Description
[0001] Stator and method for producing a stator
[0002] The present invention relates to a stator of an electrical machine, in particular for a drive train of a motor vehicle, comprising a stator body with a plurality of stator slots extending axially through the stator body, in which a stator winding consisting of a plurality of electrical conductors is accommodated, which emerges at each of the two end faces of the stator body, forming a respective winding head. The invention further relates to a method for producing a stator.
[0003] Electric motors are increasingly being used to power motor vehicles, creating alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday suitability of electric drives and also to provide users with the same level of driving comfort they are accustomed to.
[0004] A detailed description of an electric drive can be found in an article in the magazine ATZ, Volume 63, May 2006, pages 360-365, by Erik Schneider, Frank Fickl, Bernd Cebulski, and Jens Liebold, titled "Highly Integrated and Flexible Electric Drive Unit for E-Vehicles." This article describes a drive unit for a vehicle axle that includes an electric motor arranged concentrically with a bevel gear differential. Such drive units are also referred to as e-axles.
[0005] In addition to purely electric drivetrains, hybrid drivetrains are also known. Such drivetrains in a hybrid vehicle typically comprise a combination of an internal combustion engine and an electric motor, enabling purely electric operation—for example, in urban areas—while maintaining sufficient range and availability, particularly during long-distance journeys. Furthermore, in certain operating situations, it is possible to drive the vehicle simultaneously using both the internal combustion engine and the electric motor. For the development of electric machines, particularly electric machines for the aforementioned hybrid or fully electric motors or for wheel hub drives, various winding technologies for the stator of an electric machine are known.
[0006] In electrical machines that have a hollow cylindrical stator, i.e. are designed as internal rotor machines, and that are configured for use as a traction drive in a motor vehicle, they often have a stator winding with a rectangular cross-section in order to achieve a high power density. In electrical machines intended for powering motor vehicles, the stator windings are therefore typically designed as I-pin or hairpin windings. In this case, for example, essentially I- or U-shaped wire segments are inserted from one end of the stator into the stator slots and then formed on an opposite end of the stator and connected, for example, by welding.
[0007] When manufacturing such stators, various challenges arise in order to produce them cost-effectively and reliably. Some essential and cost-intensive manufacturing steps include the electrical insulation of the winding from the stator slots using insulating paper, the fixation of the individual laminations or lamination stacks of the stator by joining them using clinching, bonding with self-bonding varnish, or welding, the deformation of the hairpins of a hairpin winding using a bending tool, and the closing of the stator slots using a slot-closing wedge.
[0008] The object of the invention is therefore to provide a stator that is optimized in terms of production and can be manufactured particularly inexpensively. It is also an object of the invention to implement an improved manufacturing method for a stator.
[0009] This object is achieved by a stator of an electrical machine, in particular for a drive train of a motor vehicle, comprising a stator body with a plurality of stator slots extending axially through the stator body, in which a stator winding consisting of a plurality of electrical conductors is received, which emerges at the two end faces of the stator body to form a respective winding head, wherein at least one plastic injection-molded element is injection-molded in or on the stator body.
[0010] This provides the advantage that a single injection-molded plastic element can provide a range of different functions in a component produced by injection molding. These functions of the injection-molded plastic element can, for example, be selected from the group of fixing functions, closure functions, insulation functions, and / or sealing functions.
[0011] In this context, it is particularly preferred that a plurality of individual laminations or lamination stacks of the stator body are fixed in position relative to one another by means of the plastic injection-molded element. This eliminates the need for fixation / stabilization / packaging by baked varnish, clinching, and / or welding, since this is achieved by the plastic injection-molded element.
[0012] A thermosetting plastic, such as an epoxy resin, could be used as the plastic for molding the plastic injection-molded element, but other plastics are also conceivable in principle. The plastic injection-molded element is preferably formed from one plastic. It is also conceivable for the plastic injection-molded element to be formed from several different plastics, for example, using a dual-injection molding process.
[0013] A plastic injection-molded element is preferably formed in one piece. However, it is also conceivable for the plastic injection-molded element to be formed in multiple parts, in which case it is further preferred for the multiple parts of the plastic injection-molded element to be formed from the same plastic. In principle, it is conceivable for multiple plastic injection-molded elements to be present in or on the stator.
[0014] A key aspect of the invention is that the plastic injection-molded element is molded into or onto the stator body. This means that the plastic injection-molded element was formed in or onto the stator body during the injection-molding process and was not subsequently arranged as a separate component in or onto the stator.
[0015] The stator according to the invention is intended for use in an electrical machine. The electrical machine serves to convert electrical energy into mechanical energy and / or vice versa, and it generally comprises the stationary part referred to as the stator, stand, or armature, and a part referred to as the rotor or runner, which is arranged so as to be movable, in particular rotatable, relative to the stationary part. In particular, the electrical machine is dimensioned such that vehicle speeds greater than 50 km / h, preferably greater than 80 km / h, and in particular greater than 100 km / h, can be achieved. The electric motor particularly preferably has an output greater than 30 kW, preferably greater than 50 kW, and in particular greater than 70 kW. It is further preferred that the electrical machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, and most particularly preferably greater than 12,500 rpm.
[0016] The stator can in particular be supplied with current by power electronics, which are occasionally also referred to as an inverter. The power electronics are preferably a combination of various components which control or regulate a current to the stator, preferably including the peripheral components required for this purpose, such as cooling elements or power supplies. In particular, the power electronics contain one or more power electronics components which are designed to control or regulate a current. These are particularly preferably one or more power switches, e.g., power transistors. The power electronics particularly preferably have more than two, particularly preferably three, separate phases or current paths, each with at least one separate power electronics component.The power electronics are preferably designed to control or regulate a power per phase with a peak power, preferably continuous power, of at least 10 W, preferably at least 100 W, particularly preferably at least 1000 W. The power electronics are preferably connected to the stator winding of the stator via an HV terminal (HV = high voltage).
[0017] For the purposes of this application, motor vehicles are defined as land vehicles that are propelled by mechanical power without being tied to railway tracks. A motor vehicle can, for example, be selected from the group of passenger cars (PCs), trucks (HGVs), mopeds, light motor vehicles, motorcycles, buses (KOMs), or tractors.
[0018] The stator according to the invention can preferably be configured for a radial flux machine. The stator of a radial flux machine is usually cylindrical or cylindrically ring-shaped and generally consists of a stator body formed by electrically insulated, layered, and stacked laminations in laminated cores. This structure minimizes the eddy currents in the stator caused by the stator field. Distributed around the circumference, stator slots are recessed into the electrical core, running parallel to the rotor shaft, and accommodate the stator winding or parts of the stator winding. Depending on the design, the slots can be closed with closure elements, such as closure wedges, covers, or the like, to prevent the stator winding from becoming detached.
[0019] The stator body is preferably formed as a single piece. A single-piece stator body is characterized by the fact that the entire stator body is formed as a single piece across its circumference. The stator body is typically formed from a plurality of stacked laminated electrical sheets, each of which is formed into a closed circular ring. The individual sheets can be held together in the stator body, for example, by gluing, welding, or screwing.
[0020] The stator teeth of the stator are preferably formed in the stator body. Stator teeth are components of the stator body that are designed as circumferentially spaced, tooth-like parts of the stator body that are directed radially inward (inner rotor) or radially outward (outer rotor). Between their free ends and a rotor body, an air gap is formed for the magnetic field and for the rotational movement of the rotor. The air gap is the non-magnetic gap existing between the rotor and the stator. In a radial flux machine, for example, this is an essentially circular gap with a radial width that corresponds to the distance between the rotor body and the stator body.
[0021] A stator winding is embedded in the stator slots of the stator according to the invention. A stator winding comprises electrically conductive conductors whose length is significantly greater than their diameter. The stator winding can, in principle, have any cross-sectional shape. Rectangular cross-sectional shapes are preferred, as these allow for high packing and, consequently, power densities. A stator winding is most preferably made of copper.
[0022] Preferably, the winding is designed as an I-pin or hairpin winding.
[0023] Further advantageous embodiments of the invention are specified in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technologically expedient manner and can define further embodiments of the invention.
[0024] Furthermore, the features specified in the claims are further specified and explained in the description, with further preferred embodiments of the invention being presented.
[0025] According to an advantageous embodiment of the invention, it can be provided that the stator slots each have slot side walls extending in the radial direction in cross-section and a slot base, wherein the plastic injection-molded element completely covers the slot side walls and the slot base. The advantage of this embodiment is that by coating the side walls and the slot base with a plastic, the use of a separate insulating paper can be dispensed with. It is understood that the plastic has electrically insulating properties for this purpose. It is further preferred in this context that the plastic injection-molded element has a substantially uniform layer thickness on the slot side walls and the slot base.The complete coverage of the side walls and the slot base also makes it possible to create a fluid seal between the stator slots and the stator body, allowing the stator to also have fluid cooling of the stator slots. Furthermore, the design of the plastic injection-molded element on the slot side walls and the slot base can support the fixation of the stator laminations or stator lamination stacks.
[0026] According to a further preferred development of the invention, it can also be provided that the stator slots each have a slot opening extending radially in cross-section, with the plastic injection-molded element closing the slot opening. This makes it possible to close the stator slots radially inward by the plastic injection-molded element, thus eliminating the need for the otherwise conventional slot closure wedges.
[0027] In this case, it is particularly preferred that the plastic injection-molded element that covers the groove side walls and the groove base as well as the plastic injection-molded element that closes the groove opening are formed in one piece, preferably monolithically.
[0028] Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the plastic injection-molded element has a first cylindrical ring section which extends in the axial direction from the stator body and runs radially below the first winding head, and / or the plastic injection-molded element has a second cylindrical ring section which extends in the axial direction from the stator body and runs radially above the first winding head, and / or the plastic injection-molded element has a third cylindrical ring section which extends in the axial direction from the stator body and runs radially below the second winding head and / or the plastic injection-molded element has a fourth cylindrical ring section which extends in the axial direction from the stator body and runs radially above the second winding head.
[0029] One or more of the cylinder ring sections can be used to define different spaces and zones in or on the stator, each of which can have different functions. For example, it would be conceivable to use the first cylinder ring section to define a separation between a wet room and a dry room.
[0030] In this context, it is particularly preferred that the first cylinder ring section and / or the second cylinder ring section and / or the third cylinder ring section and / or the fourth cylinder ring section are formed in one piece, preferably monolithically, with the plastic injection-molded element that covers the groove side walls and the groove base.
[0031] In this context, it is further particularly preferred that the first cylinder ring section and / or the second cylinder ring section and / or the third cylinder ring section and / or the fourth cylinder ring section are formed in one piece, preferably monolithically, with the plastic injection-molded element that closes the groove opening.
[0032] According to a further particularly preferred embodiment of the invention, it can be provided that the plastic injection-molded element has a first connecting section which at least partially covers an outer circumferential surface of the stator body. This makes it possible, in particular, to thermally decouple the stator body from a connecting structure, such as a motor housing or a stator carrier. This can be particularly desirable if the heat from the stator is not intended or cannot be dissipated via its outer circumferential surface to thermally sensitive adjacent structures or components, but rather, for example, in a targeted manner via fluidic cooling, such as in particular by means of a cooling oil. In this case, the connecting section can preferably be designed to be non-positively and / or positively connected between the stator body and a connecting structure.In this context, it is further preferred that the connecting section is formed in one piece, preferably monolithically, with the first cylinder ring section and / or the second cylinder ring section and / or the third cylinder ring section and / or the fourth cylinder ring section of the plastic injection-molded element.
[0033] It is further preferred that the connecting section is formed integrally, preferably monolithically, with the plastic injection-molded element that covers the groove side walls and the groove base.
[0034] It may also be preferred that the connecting section is formed in one piece, preferably monolithically, with the plastic injection-molded element that closes the groove opening.
[0035] Furthermore, the invention can also be further developed such that a stator tooth extending in the axial direction through the stator body is formed in the circumferential direction between each two adjacent stator slots, and the plastic injection-molded element covers an end face of one or more stator teeth. This can particularly improve the slot insulation. In a likewise preferred embodiment of the invention, it can also be provided that the plastic injection-molded element has a contour protruding axially from the end face, which serves as a forming tool during twisting of the corresponding winding overhang. This can ensure that the geometry of the plastic injection-molded element on the end face of the stator body is designed such that, for example, the hairpins of a hairpin winding can be bent directly over this geometry and no additional tool is required.This bending of the conductors of the stator winding in the winding head area outside the stator body is also called interlacing or twisting.
[0036] In this context, it is further preferred that the contour be formed integrally, preferably monolithically, with the first cylindrical ring section and / or the second cylindrical ring section and / or the third cylindrical ring section and / or the fourth cylindrical ring section of the plastic injection-molded element. It is further preferred that the contour be formed integrally, preferably monolithically, with the plastic injection-molded element that covers the groove side walls and the groove base.
[0037] It may also be preferred that the contour is formed in one piece, preferably monolithically, with the plastic injection-molded element that closes the groove opening.
[0038] Furthermore, it may also be preferred that the contour is formed in one piece, preferably monolithically, with the plastic injection-molded element that forms the connecting section.
[0039] It may also be advantageous to further develop the invention such that the second cylindrical ring section extending axially from the stator body extends radially above the first winding head and radially below the outer diameter of the stator body, and / or the fourth cylindrical ring section extending axially from the stator body extends radially above the second winding head and radially below the outer diameter of the stator body. This can, for example, thermally decouple a wet space from a connecting structure, such as a motor housing, in order to protect thermally sensitive areas around the stator from unwanted thermal stress.
[0040] According to a further preferred embodiment of the subject matter of the invention, it can be provided that the first cylinder ring section and / or the second cylinder ring section and / or the third cylinder ring section and / or the fourth cylinder ring section each have at least one form-locking means for connecting at least one component to the respective cylinder ring section. This allows for further optimized system integration and a further elimination of separate components.
[0041] The object of the invention can also be achieved by a method for producing a stator of an electrical machine, in particular for a drive train of a motor vehicle, in particular a stator according to one of claims 1-9, comprising the following steps:
[0042] • Providing a stator with a stator body having a plurality of stator slots extending axially through the stator body, in which a stator winding consisting of a plurality of electrical conductors can be positioned,
[0043] • Inserting the stator into an injection molding tool of an injection molding machine,
[0044] • Injection molding of at least one plastic injection molded element in or on the stator body,
[0045] • Removing the stator from the injection mold.
[0046] An essential aspect of the invention is therefore the simplification of manufacturing processes and the merging of several functions of previously separate components of a stator in one or more plastic injection-molded elements that are formed in one injection-molding process.
[0047] It goes without saying that the individual functions described and their structural elements can be combined individually or in any combination. For example, it would be possible for the plastic injection-molded element to implement only the slot insulation using plastic, but without the contour for bending the hairpins.
[0048] The invention will be explained in more detail below with reference to figures without limiting the general inventive concept.
[0049] It shows:
[0050] Figure 1 shows a motor vehicle with an electric machine in a schematic block diagram, Figure 2 shows an electric machine in a schematic cross-sectional view,
[0051] Figure 3 shows a wound stator in a first axial section,
[0052] Figure 4 shows the wound stator known from Figure 3 in a first perspective axial section view,
[0053] Figure 5 shows a non-wound stator in a second axial section,
[0054] Figure 6 shows the unwound stator known from Figure 5 in a second perspective axial section view,
[0055] Figure 7 shows a first embodiment of a slot closure in a detailed cross-sectional view,
[0056] Figure 8 shows a second embodiment of a slot closure in a detailed cross-sectional view,
[0057] Figure 9 is a detailed view from the radial direction of the winding head of the stator with a contour formed on the stator teeth and extending in the axial direction for interlacing the electrical conductors,
[0058] Figure 10 is a detailed view from the radial direction of the unwound winding head area of the stator with a contour formed on the stator teeth and extending in the axial direction for interlacing the electrical conductors, Figure 11 is a perspective detailed view of the unwound winding head area of the stator with a contour formed on the stator teeth and extending in the axial direction for interlacing the electrical conductors.
[0059] Figure 2 shows a stator 1 of an electrical machine 2, in particular for a drive train 3 of a motor vehicle 4, as also sketched in Figure 1.
[0060] As can be seen from the combined view of Figures 1 and 3, the stator 1 comprises a stator body 5 with a plurality of stator slots 6 extending axially through the stator body 5, in which a stator winding 8 consisting of a plurality of electrical conductors 7 is received, which emerges at the two end faces 10a, 10b of the stator body 5, forming a respective winding head 9a, 9b. The stator 1 is configured for an internally rotating radial flux machine and has a correspondingly hollow-cylindrical stator body 5 in which the rotor 26 is rotatably mounted.
[0061] At least one plastic injection-molded element 11 is molded into or onto the stator body 5.
[0062] From Figures 7-8 it can be seen that the stator slots 6 each have slot side walls 12 extending in the radial direction in cross-section and a slot base 13, wherein the plastic injection-molded element 11 completely covers the slot side walls 12 and the slot base 13. The stator slots 6 furthermore each have a slot opening 14 extending in the radial direction in cross-section, wherein the plastic injection-molded element 11 closes the slot opening 14. Figure 7 shows an embodiment which was formed by a tool 25 moving into the slot opening 14, so that the slot opening 14 is closed in the radially upper region of the slot opening 14. This has the advantage that the tool 25 can be guided into the radially inner section of the slot opening 14. Figure 8 shows an alternative embodiment in which the slot opening 14 is completely filled with plastic, whereby structurally simpler tools can be used.
[0063] As shown in Figures 3-6, the plastic injection-molded element 11 has a first cylindrical ring section 15 which extends axially out of the stator body 5 and runs radially below the first winding head 9a. In the embodiment shown, the plastic injection-molded element 11 also has a second cylindrical ring section 16 which extends axially out of the stator body 5 and runs radially above the first winding head 9a. As a result, the first winding head 9a is enclosed by an annular space defined by the first cylindrical ring section 15 and the second cylindrical ring section 16. It is possible for the cylindrical ring sections 15, 16 to be formed in two pieces and have no physical connection to one another, but to be injection-molded onto the stator body 5 in the same injection-molding process. The cylindrical ring sections 15, 16 are formed from the same plastic.
[0064] A plastic injection-molded element 11 further comprises a third cylindrical ring section 17 extending axially from the stator body 5 and extending radially below the second winding head 9b, and a fourth cylindrical ring section 18 extending axially from the stator body 5 and extending radially above the second winding head 9b. As a result, the second winding head 9b is also enclosed by an annular space defined by the third cylindrical ring section 17 and the fourth cylindrical ring section 18. It is also possible for the cylindrical ring sections 17, 18 to be formed in two pieces and have no physical connection to one another, but to be molded onto the stator body 5 in the same injection-molding process, and the cylindrical ring sections 15, 16 to be formed from the same plastic.
[0065] Figures 3-6 also show that the second cylindrical ring section 16 extending axially from the stator body 5 extends radially above the first winding head 9a and radially below the outer diameter 24 of the stator body 5. The fourth cylindrical ring section 18 extending axially from the stator body 5 is also formed radially above the second winding head 9b and radially below the outer diameter 24 of the stator body 5. This allows for further thermal decoupling of the winding head region from a connection structure (not shown).
[0066] Figures 3-6 further show that the plastic injection-molded element 11 has a first connection section 19, which at least partially covers an outer surface 20 of the stator body 5. This allows for thermal decoupling from a connection structure that accommodates the stator 1.
[0067] From a view of Figure 2 together with Figures 9-11, it is further apparent that, in the circumferential direction, between each two adjacent stator slots 6, a stator tooth 21 is formed extending axially through the stator body 5, and the plastic injection-molded element 11 covers an end face 22 of one or more stator teeth 21. The plastic injection-molded element 11 has a contour 23 projecting axially from the end face 22, which serves as a molding tool during the twisting of the corresponding winding head 9a, 9b.
[0068] The invention is not limited to the embodiments illustrated in the figures. The above description is therefore not to be considered restrictive, but rather explanatory. The following claims are to be understood as meaning that a stated feature is present in at least one embodiment of the invention. This does not exclude the presence of further features. Where the claims and the above description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing a priority. List of reference symbols
[0069] 1 stator
[0070] 2 electric machine
[0071] 3 Drivetrain
[0072] 4 Motor vehicle
[0073] 5 Stator body
[0074] 6 stator slots
[0075] 7 electrical conductors
[0076] 8 Stator winding
[0077] 9 winding head
[0078] 10 front sides
[0079] 11 Plastic injection molded element
[0080] 12 groove side walls
[0081] 13 Groove base
[0082] 14 Groove opening
[0083] 15 Cylinder ring section
[0084] 16 Cylinder ring section
[0085] 17 Cylinder ring section
[0086] 18 Cylinder ring section
[0087] 19 connecting section
[0088] 20 lateral surface
[0089] 21 stator tooth
[0090] 22 Frontal surface
[0091] 23 Contour
[0092] 24 outer diameter
[0093] 25 tools
[0094] 26 Rotor
Claims
Claims 1. Stator (1) of an electrical machine (2), in particular for a drive train (3) of a motor vehicle (4), comprising a stator body (5) with a plurality of stator slots (6) extending axially through the stator body (5), in which a stator winding (8) consisting of a plurality of electrical conductors (7) is received, which emerges at the two end faces (10a, 10b) of the stator body (5) to form a respective winding head (9a, 9b), characterized in that at least one plastic injection-molded element (11) is injection-molded in or on the stator body (5).
2. Stator (1) according to claim 1, characterized in that the stator slots (6) each have slot side walls (12) extending in the radial direction in cross-section and a slot base (13), wherein the plastic injection-molded element (11) completely covers the slot side walls (12) and the slot base (13).
3. Stator (1) according to claim 1 or 2, characterized in that the stator slots (6) each have a slot opening (14) extending in cross-section in the radial direction, wherein the plastic injection-molded element (11) closes the slot opening (14).
4. Stator (1) according to one of the preceding claims, characterized in that the plastic injection-molded element (11) has a first cylindrical ring section (15) extending in the axial direction from the stator body (5) and extending radially below the first winding head (9a) and / or the plastic injection-molded element (11) has a second cylindrical ring section (16) extending in the axial direction from the stator body (5) and running radially above the first winding head (9a), and / or the plastic injection-molded element (11) has a third cylindrical ring section (17) extending in the axial direction from the stator body (5) and running radially below the second winding head (9b), and / or the plastic injection-molded element (11) has a fourth cylindrical ring section (18) extending in the axial direction from the stator body (5) and running radially above the second winding head (9b).
5. Stator (1) according to one of the preceding claims, characterized in that the plastic injection-molded element (11) has a first connecting section (19) which covers an outer circumferential surface (20) of the stator body (5) at least in sections.
6. Stator (1) according to one of the preceding claims, characterized in that in the circumferential direction between each two adjacent stator slots (6) a stator tooth (21) extending in the axial direction through the stator body (5) is formed, and the plastic injection-molded element (11) covers each end face (22) of one or more stator teeth (21).
7. Stator (1) according to one of the preceding claims, characterized in that the plastic injection-molded element (11) has a contour (23) projecting axially from the end face (22), which serves as a molding tool during the twisting of the corresponding winding head (9a, 9b).
8. Stator (1) according to one of the preceding claims 4-7, characterized in that the second cylindrical ring section (16) extending in the axial direction from the stator body (5) extends radially above the first winding head (9a) and radially below the outer diameter (24) of the stator body (5), and / or the fourth cylindrical ring section (18) extending in the axial direction from the stator body (5) extends radially above the second winding head (9b) and radially below the outer diameter (24) of the stator body (5), 9. Stator (1) according to one of the preceding claims 4-8, characterized in that on the first cylinder ring section (15) and / or the second cylinder ring section (16) and / or the third cylinder ring section (17) and / or the fourth cylinder ring section (18) each has at least one form-locking means for connecting at least one component to the respective cylinder ring section (15, 16, 17, 18).
10. A method for producing a stator (1) of an electrical machine (2), in particular for a drive train (3) of a motor vehicle (4), in particular a stator (1) according to one of claims 1-9, comprising the following steps: • Providing a stator (1) with a stator body (5) with a plurality of stator slots (6) extending axially through the stator body (5) in which a stator winding (8) consisting of a plurality of electrical conductors (7) can be positioned, • Inserting the stator (1) into an injection molding tool of an injection molding machine, • Injection molding at least one plastic injection molding element (11) in or on the stator body (5). Removing the stator (1) from the injection mold.