Insulation body arrangement of a stator and method for joining an insulation body arrangement

Abstract

An insulating body assembly for a stator of an electrical machine and a method for manufacturing such an insulating body assembly are provided. The insulating body assembly comprises a disc-shaped insulating body with a flat contact and bearing surface, wherein the disc-shaped insulating body is arranged on an inner end face of the stator. Furthermore, a radially extending insulating body with radial and circular contact and bearing surfaces is provided, wherein the radially extending insulating body extends circumferentially around the stator and is adjacent to the disc-shaped insulating body.The insulating body arrangement is characterized in that the radially extending insulating body has a plurality of identical individual elements and engagement elements are formed at the ends of the individual elements, which interlock in such a way as to connect the individual elements to each other and to form a gap between the individual elements.

Description

[0001] The present disclosure relates to an insulating body arrangement of a stator for an electric machine and / or a method for manufacturing such an insulating body arrangement. Additionally, or alternatively, an electric machine comprising a stator with the insulating body arrangement according to the disclosure and / or a motor vehicle with the electric machine according to the disclosure is provided.

[0002] Modern motor vehicles, especially automobiles, increasingly incorporate electric machines (motors and / or generators) that convert electrical energy into kinetic energy (propulsion) or vice versa (generator operation). In electric / hybrid vehicles, electric machines are therefore used as drive machines to propel the vehicle by converting electrical energy from the vehicle's energy storage system, often a high-voltage battery, into torque and motion.

[0003] In electric / hybrid vehicles, clearance and creepage distances are important considerations for safety and vehicle performance. The "clearance distance" refers to the minimum distance between two conductive elements to prevent electrical arcing through the air and ensure insulation. The "creep distance" refers to the minimum distance to prevent electrical arcing across or along the surface of a material and ensure insulation. Since electric motors (drive motors), batteries, power electronics, and / or other electrical components are installed in the confined space of a vehicle, it may be necessary to provide appropriate clearances between conductive parts and insulation.This applies particularly to the construction and interior of electrical machines. Depending on the voltage level used and / or the nature of the installation space of the electrical machine, the degree of internal and external pollution during operation, and the level of technical cleanliness, the clearances for the safe operation of the electrical machine can amount to several millimeters.

[0004] In conventional designs, compliance with the air gap (air) is ensured by a spatial distance. This leads to a reduction in the maximum available installation space for the active components (here, the stator lamination stack and stator winding heads). Furthermore, air is a thermal insulator, thus hindering heat dissipation (especially from the stator winding heads). The stator winding heads can heat up considerably and, as so-called hot spots, can be critical and therefore limiting for the electromagnetic design.

[0005] Document DE 10 2016 222 614 A1 proposes a stator of an electric machine with a pole housing, on the inner wall of which winding carriers carrying electrical coils are located, wherein the winding carriers have a stator tooth which is integrally formed on a yoke element which is radially located on the inner wall, and an insulating mask is arranged on the winding carrier which insulates the electrical coil from the winding carrier, and the insulating mask extends axially beyond the high element with an axial extension, wherein the axial extension with a circumferentially extending collar is radially located on the inner wall of the pole housing.

[0006] Document US 2021 / 009 9058 A1 proposes a wire bonding device for a motor stator comprising insulating rings, an insulating cover, and a conductor. Each insulating ring has a first and a second fastening structure arranged on it. The insulating rings are stacked in layers, with the first fastening structure corresponding to the second fastening structure. The insulating cover covers one of the uppermost insulating rings. Each conductor comprises one embedded segment, two bending segments, two protruding segments, and two wire bonding segments.

[0007] In light of this prior art, one objective of the present disclosure is to specify an insulating body arrangement of a stator for an electrical machine and / or a method for manufacturing an insulating body arrangement of a stator for an electrical machine, each of which is suitable to enrich the prior art.

[0008] The problem is solved by the features of the independent claims. The subordinate claims and the dependent claims each contain optional developments of the disclosure.

[0009] The problem is then solved by an insulating body arrangement of a stator for an electric machine. The insulating body arrangement comprises a disc-shaped insulating body with flat contact and bearing surfaces, wherein the disc-shaped insulating body is arranged on an inner end face of the stator. The disc-shaped insulating body is arranged with a flat contact and bearing surface abutting the inner end face of the stator. Furthermore, a radially extending insulating body with radial and circular contact and bearing surfaces is provided, wherein the radially extending insulating body extends along the inner wall in the circumferential direction of the stator and is adjacent to the disc-shaped insulating body.The insulation body arrangement of the stator is characterized in that the radially extending insulation body has a plurality of identical individual elements and engagement elements are formed at the ends of the individual elements, which interlock in such a way as to connect the individual elements to each other and to form a gap between the individual elements.

[0010] In other words, the disc-shaped insulating body rests against the inner end face of the housing. The radially extending insulating body rests against the circumferential inner wall of the housing and maintains a minimal distance to the stator winding heads.

[0011] For the purposes of this disclosure, a disc-shaped insulating body is a body having the shape of a disc or a flat, round body and made of a material that has electrically insulating properties. The disc-shaped insulating body has two flat contact and bearing surfaces. One of the two flat contact and bearing surfaces is located after joining or...

[0012] Install the insulation body assembly into the stator in contact with the inside of the stator housing.

[0013] For the purposes of this disclosure, a radially extending insulating body is a body that extends along a radial direction of the stator. From a central point of the stator, the radially extending insulating body has the same extent in every direction. The radially extending insulating body extends in the longitudinal direction of the stator. The radially extending insulating body has inner and outer radially and circularly extending contact and bearing surfaces. The inner radially and circularly extending contact and bearing surface may be in contact with a stator lamination stack. The outer radially and circularly extending contact and bearing surface may be in contact with the inner surface of the stator (stator housing). The shape of the radially extending insulating body may be determined by the shape of the stator and may be circular.

[0014] For the purposes of this disclosure, "adjacent" means that the radially extending insulating body is positioned in close proximity to or directly adjacent to the disc-shaped insulating body, without forming a perceptible gap. The two insulating bodies may be in contact with each other or positioned very close to one another without forming a gap or interruption between them.

[0015] The insulation body arrangement described above offers several advantages. Among other things, the use of a radial step for a stop of the stator lamination stack is eliminated. The radially extending insulation body has flat contact and bearing surfaces on its end faces, which can serve as an axial stop for the stator lamination stack after the insulation body arrangement is assembled, thus eliminating the need to manufacture a radial step. Furthermore, the air gap is reduced by highly electrically insulating components, allowing for maximum utilization of the axial and radial installation space for the stator. This can generally lead to higher performance of the electric machine. In addition, heat dissipation can be increased due to minimal distances to the highly thermally conductive insulation bodies. Furthermore, the need for encapsulation of the air volume can be completely eliminated, further enhancing heat dissipation.The multi-part design of the radially extending insulating body, with its numerous identical individual elements, allows for the compensation of tolerances in the manufacturing of these individual segments and the joining diameters of the stator lamination stack within the stator housing. Furthermore, it enables the compensation of thermal stresses (due to differing coefficients of thermal expansion) after assembly and during operation of the electric machine.

[0016] Possible further developments of the insulation body arrangement described above are explained in detail below.

[0017] The disc-shaped insulating body and / or the radially extending insulating body can be designed to be electrically insulating and thermally conductive. The thermal conductivity (TC) of the electric machine can be reduced and heat dissipation improved by the insulating effect of the insulating bodies. This can increase the power output of the electric machine.

[0018] The disc-shaped insulating body and / or the radial insulating body may be made of (or consist of) PEEK, PEI, PI, PTFE, PPS, or LCP. In other words, the disc-shaped insulating body and / or the radial insulating body may be made of a material selected from the following group: PEEK, PEI, PI, PTFE, PPS, and LCP. PEEK stands for polyetheretherketone and is a high-performance polymer with good mechanical, thermal, and chemical properties. PEI stands for polyetherimide and exhibits high temperature resistance, mechanical strength, and electrical insulation properties. PI stands for polyimide and is a temperature-resistant polymer with good electrical insulation and mechanical strength. PTFE stands for polytetrafluoroethylene and offers good non-stick properties, electrical insulation, and thermal stability.PPS stands for polyphenylene sulfide and is a high-performance polymer with high temperature resistance, chemical resistance, and insulating properties. LCP stands for liquid crystal polymer and is a polymer with a crystalline structure, offering a combination of high temperature resistance, low moisture absorption, and electrical insulation. It provides the necessary electrical insulation with good temperature resistance and thermal conductivity.

[0019] The disc-shaped insulating body can be designed as a single piece or as a multi-piece design. A single-piece design can be manufactured from a single piece, which can simplify production and assembly / joining, as no joints or assembly steps for multiple elements would be required. A single-piece disc-shaped insulating body may also be less susceptible to potential weak points. A multi-piece disc-shaped insulating body can offer advantages in terms of customization and flexibility. By using multiple parts, the disc-shaped insulating body can assume more complex shapes or meet more specific requirements. Multi-piece structures can also be more flexible during assembly and disassembly, as they can be more easily taken apart when maintenance or repairs are needed.

[0020] The engagement elements can be designed as Z-shaped step elements, with the step elements of a single element being inversely Z-shaped relative to each other. Viewed from the side, a Z-shaped step element has two horizontal legs connected by a vertical web. The two horizontal legs point in opposite directions, forming the shape of a "Z". A Z-shaped step element on one side of a single element has a reversed arrangement compared to the other Z-shaped step element on the opposite side of the single element. This allows one leg of the reversed Z-shaped step element to be positioned precisely against the leg of the Z-shaped step element of an adjacent single element.One leg can be positioned on the other leg, and the contact and bearing surfaces are flat. There is no offset at the connection point. The interlocking and overlapping design allows the individual elements to be securely and stably mounted to one another. This assembly also increases the clearance and creepage distances. The individual elements are not mounted in contact with the adjacent element at their Z-shaped stepped elements, but with a certain gap (air gap) to compensate for tolerances and stresses and to prevent damage and cracking.

[0021] The radially extending insulating body can be designed to have at least four individual elements. In one embodiment, the radially extending insulating body can have six identical radially extending insulating elements. Increasing the number of elements minimizes the risk of damage and cracking.

[0022] The radially extending insulating body can be designed with flat contact and bearing surfaces on both ends. A flat contact and bearing surface can be provided for the inner wall of the stator (stator housing). Furthermore, a flat contact and bearing surface can be provided for the stator lamination stack, where it can serve as an axial stop for the stator lamination stack after assembly. This eliminates the need for an additional radial step for the axial stop of the stator lamination stack, which can negatively lead to stresses due to the notch factor and to changes in stiffness due to varying wall thicknesses.

[0023] The above can be summarized in other words and in a possible more concrete elaboration of the revelation as described below, whereby the following description is to be interpreted as not being restrictive for the revelation.

[0024] In general, certain clearance and creepage distances (CVs) should be maintained in energized machines to prevent voltage flashovers between two live materials / components. Creepage distances can refer to distances extending along the surface of insulating material between two live elements. The clearance, on the other hand, can be the path through the air between two live elements. Depending on the voltage level and the characteristics of the installation space (e.g., regarding the degree of internal and external contamination during operation, and technical cleanliness), the CVs for safe operation of the electric machine can be several millimeters (e.g., approximately 4 mm and 6 mm), with the creepage distance being, by definition, greater than the clearance. In current designs, compliance with the CVs can be ensured by maintaining a certain spatial distance (air gap).This leads to a reduction in the maximum available installation space for the active components (here, the stator lamination stack and stator winding heads). Furthermore, air is a thermal insulator, which can hinder heat dissipation (especially from the stator winding heads). The stator winding heads can heat up considerably and, as so-called hot spots, can be considered critical and thus limiting for the electromagnetic design. To compensate for these disadvantages, the proposed concept can be based on an end-face and a radial insulation body, with the radial insulation body being composed of several individual parts / segments (individual elements). A stator housing can also be provided. The proposed concept can be applied to all topologies of an electrical machine. The insulation bodies can be highly electrically insulating and simultaneously highly thermally conductive.PEEK can be used as the material. The end-face insulation body can be designed as a single-piece, disc-shaped body with a flat contact and bearing surface facing the housing. A design with a multi-part, disc-shaped body is also possible. The radial insulation body can be multi-part and constructed from identical individual segments to compensate for manufacturing tolerances in these segments and for the joining diameter of the stator lamination stack in the stator housing. Furthermore, thermal stresses (due to differing coefficients of thermal expansion) can be compensated for after joining (bonding) and during operation of the electric machine. Additionally, the individual segments can have so-called Z-shaped steps (step elements) at both radial ends to increase the clearance and creepage distances.The individual segments can be mounted at intervals on their Z-shaped steps, i.e., with a certain air gap to compensate for the aforementioned tolerances and stresses. If the radial insulation body were made from only one component, this could lead to damage / cracks for the reasons mentioned above. The radial insulation body can be constructed from at least four (or more, e.g., six) identical individual segments. The more individual segments are used, the lower the probability of damage / cracks for the reasons mentioned above, but the more complex the assembly can become. Furthermore, the radial insulation body can have flat contact and bearing surfaces on both ends. One faces the inner wall of the stator housing, and the other faces the stator lamination stack, where it can serve as an axial stop for the stator lamination stack after assembly.Thus, compared to current concepts, the need to manufacture a radial step for the axial stop of the stator lamination stack can be eliminated, which in turn can lead to stresses (due to the notch factor) and stiffness discontinuities (due to varying wall thicknesses = radial step). The advantages of the proposed concept are summarized below: Elimination of a radial step for the axial stop of the stator lamination stack; reduction of air gap due to highly electrically insulating components, thus maximizing the utilization of axial and radial installation space for the stator, which generally leads to higher machine performance; increased heat dissipation due to minimal distances to the highly thermally conductive insulating elements; and additionally, potting can completely reduce the air volume and further increase heat dissipation.

[0025] Furthermore, an electric machine with a rotor assembly and a stator with the insulation arrangement described above is provided. The description above regarding the insulation arrangement also applies analogously to the electric machine and vice versa. The electric machine can be designed as an electric traction motor and may include permanent magnet motors, asynchronous motors, and / or brushless DC motors. The electric machine can serve as the primary and / or secondary drive for a motor vehicle. The electric machine can therefore be installed in the motor vehicle individually or in combination with another drive machine, e.g., an internal combustion engine and / or a hydrogen drive.

[0026] Furthermore, a motor vehicle equipped with the electric machine described above is provided. The descriptions above regarding the insulation arrangement and the electric machine apply analogously to the motor vehicle and vice versa. The motor vehicle can be a passenger car, in particular an automobile, or a commercial vehicle, such as a truck.

[0027] Furthermore, a method for manufacturing, and optionally joining, an insulating body assembly of a stator for an electric machine is provided. The method comprises providing a disk-shaped insulating body with flat contact and bearing surfaces, and a (in the assembled state) radially extending insulating body with radial and circular contact and bearing surfaces. The radially extending insulating body comprises a plurality of identical individual elements, and at the ends of the individual elements, engagement elements are formed that interlock with one another to connect the individual elements and form a gap between them.The method includes assembling (optionally joining) the insulation body assembly such that (after assembly) the disc-shaped insulation body is arranged on an inner end face of the stator and the radially extending insulation body is arranged on the inner wall extending circumferentially to the stator and adjacent to the disc-shaped insulation body.

[0028] What has been described above with reference to the insulating body arrangement, the electrical machine and the motor vehicle also applies analogously to the method and vice versa.

[0029] Below is an optional embodiment with reference to Fig. 1 to 8 described. Fig. Figure 1 schematically shows a motor vehicle with an electric machine according to the disclosure; Fig. Figure 2 schematically shows a stator of the electrical machine according to the disclosure with an insulating body arrangement according to the disclosure; Fig. Figure 3 schematically shows the arrangement of the insulating body as disclosed; Fig. Figure 4 schematically shows a disc-shaped insulating body of the insulating body arrangement according to the disclosure; Fig. Figure 5 schematically shows a single element of the (radially extending) insulating body of the insulating body arrangement according to the disclosure; Fig. Figure 6 schematically shows the radially extending insulating body of the insulating body arrangement according to the disclosure; Fig. Figure 7 shows a schematic detail section of the radially extending insulating body made of Fig. 2 with two individual elements of the insulating body, and Fig. Figure 8 schematically shows a cross-sectional view of a stator after assembly.

[0030] The Fig. The motor vehicle 1, shown only schematically, has the electric machine 4 as disclosed for driving the motor vehicle 1. In the Fig. Figure 1 shows only one electric machine 4, which does not preclude the possibility of a separate electric machine 4 being provided for driving the front axle and / or rear axle. Furthermore, a separate electric machine 4 may be provided for driving each wheel of the motor vehicle 1.

[0031] In Fig. 2 is a stator 3 which is in Fig. Figure 1 shows a schematic representation of the electrical machine 4 in perspective. The stator 3 has a (stator) housing for receiving a (not shown) rotor assembly and a stator lamination stack 16 (see Figure 1). Fig. 8). Furthermore, the stator 3 has the insulation body assembly 2 as disclosed. The insulation body assembly 2 is inserted into the housing of the stator 3. Inserting the insulation body assembly 2 may involve bonding the insulation body assembly 2 into the housing of the stator 3.

[0032] In Fig. Figure 3 shows the insulation body assembly 2 in perspective and in isolation. The insulation body assembly 2 in turn has a disc-shaped insulation body 5 and a radially extending insulation body 8.

[0033] The disc-shaped insulating body 5 is electrically insulating and thermally conductive. A material selected from the following group can be used to manufacture the disc-shaped insulating body 5: PEEK, PEI, PI, PTFE, PPS, LCP.

[0034] The radially extending insulating body 8, like the disc-shaped insulating body 5, is electrically insulating and thermally conductive. It can be manufactured from a material selected from the group comprising: PEEK, PEI, PI, PTFE, PPS, LCP.

[0035] In Fig. 4 is the disc-shaped insulating body 5 of the insulating body arrangement 2 according to the disclosure shown schematically in a top view in isolation.

[0036] The disc-shaped insulating body 5 is in the illustrated embodiment of the Fig. 4. Made in one piece. Alternatively, the disc-shaped insulating body 5 can be made in multiple parts.

[0037] The disc-shaped insulating body 5 has flat contact and bearing surfaces 6 on both sides. After assembly according to the disclosure (see above), the disc-shaped insulating body 5 is arranged in the housing of the stator 3 on the inner end face 7 of the stator 3 with one of the two flat contact and bearing surfaces 6 in contact with it. The disc-shaped insulating body 5 is electrically insulating and thermally conductive.

[0038] In Fig. Figure 5 shows a single element 8-x of the radially extending insulating body 8 in isolation. Fig. Figure 6 shows the associated radially extending insulating body 8 of the insulating body arrangement 2 according to the disclosure in isolation. Both are perspective views.

[0039] The radially extending insulating body 8 has radially and circularly located inner and outer contact and bearing surfaces 9, wherein the radially extending insulating body 8 is arranged on the inner wall 10 extending in the circumferential direction of the stator 3 and adjacent to the disk-shaped insulating body 5.

[0040] After the radially extending insulating body 8 has been inserted into the housing of the stator 3 as disclosed, the outer radial and circular contact and bearing surface 9 rests against the inside of the housing of the stator 3. The inner radial and circular contact and bearing surface 9 points towards the stator head 15. The radially extending insulating body 8 is arranged on the inner wall 10 of the stator 3 with the outer circular contact and bearing surface 9 extending circumferentially around the stator 3 and adjacent to the flat contact and bearing surface 14 on the disc-shaped insulating body 5.

[0041] The radially extending insulating body 8 is composed of multiple parts. It is intended that at least four identical individual elements 8-x are used to manufacture the radially extending insulating body 8 in order to avoid damage and cracks. However, more than four individual elements 8-x can also be used. In this case, the radially extending insulating body 8 is constructed from six identical individual elements 8-x.

[0042] Since the radially extending insulating body 8 has a large number of individual elements 8-x, tolerances in the manufacturing of these individual elements 8-x and the joining diameter of the stator lamination stack 16 in the housing of the stator 3, as well as thermal stresses due to different coefficients of thermal expansion, can be compensated after joining (optionally gluing) according to the disclosure and during the operation of the electric machine 4.

[0043] At the ends of these individual elements 8-x, engagement elements 11, 12 are formed which interlock in such a way that the individual elements 8-x are connected to each other and a gap 13, more precisely an air gap, is formed between the individual elements 8-x.

[0044] This gap 13 is in Fig. 7 to recognize. In Fig. 7 is an excerpt from 18 of the Fig. 2 shown as a top view. From Fig. Figure 7 shows the principle of gap formation between the intervention elements 11 and 12. Fig. Figure 7 shows two individual elements 8-1, 8-2 of the radially extending insulating body 8. The two individual elements 8-1, 8-2 form a connection using the engagement elements 11, 12. The gap 13 is left between the engagement elements 11, 12, which are designed as z-shaped step elements, to compensate for tolerances and stresses. This is achieved by the fact that the z-shaped step elements are not mounted in contact with the adjacent individual element 8-1, 8-2.

[0045] More precisely, the step elements of each individual element 8-x are designed in an inverted z-shape relative to each other in order to increase the clearance and creepage distances (LuK). The identical individual elements 8-x are therefore not mounted to the adjacent identical individual element 8-x at their z-shaped step elements, but are mounted with the gap 13 in order to compensate for tolerances and stresses.

[0046] In Fig. Figure 8 schematically shows a cross-sectional view of the stator 3 after assembly. Fig. Figure 8 represents the insulation body arrangement 2 as disclosed, inserted into the stator 3 of the electrical machine 4.

[0047] The radially extending insulating body 8 comprises, in addition to the radially and circularly shaped contact and support surface 9 described above, a flat contact and support surface 14 arranged towards the housing of the stator 3, as well as a flat contact and support surface 17.

[0048] The flat contact and bearing surface 17 on the end face is arranged relative to the stator lamination stack 16 and provides the axial stop for the stator lamination stack 16. Therefore, no additional radial step for the axial stop of the stator lamination stack 16 needs to be formed in a separate manufacturing step. List of reference symbols 1 motor vehicle 2 Insulation body arrangement 3 Stator 4 electric machine 5 disc-shaped insulating bodies 6 flat contact and support surfaces 7 Inner face of stator 8 radially extending insulating bodies 8-x individual elements 9 circular contact and bearing surfaces 10 Inner wall stator 11, 12 Intervention elements 13 gaps 14, 17 Contact and bearing surfaces 15 Stator head 16 Stator lamination stack 18 Excerpt of the Fig. 2, which in Fig. 7 is shown QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2016 222 614 A1

[0005] US 2021 / 009 9058 A1

[0006]

Claims

[1] Insulating body arrangement (2) of a stator (3) for an electrical machine (4), comprising: - a disc-shaped insulating body (5) with flat contact and support surfaces (6), wherein the disc-shaped insulating body (5) is arranged on an inner end face (7) of the stator (3), and - a radially extending insulating body (8) with radial and circular contact and support surfaces (9), wherein the radially extending insulating body (8) is arranged on an inner wall (10) extending in the circumferential direction of the stator (3) and adjacent to the disc-shaped insulating body (5), characterized by , that - the radially extending insulating body (8) has a plurality of identical individual elements (8-x) and engagement elements (11, 12) are formed at the ends of the individual elements (8-x), which engage with one another in such a way as to connect the individual elements (8-x) to one another and to form a gap (13) between the individual elements (8-x). [2] Insulating body arrangement (2) according to claim 1, characterized by that the disc-shaped insulating body (5) and / or the radially extending insulating body (8) are electrically insulating and thermally conductive. [3] Insulating body arrangement (2) according to claim 1 or 2, characterized by that the disc-shaped insulating body (5) and / or the radially extending insulating body (8) are formed from a material comprising PEEK, PEI, PI, PTFE, PPS and / or LCP. [4] Insulating body arrangement (2) according to one of the preceding claims, characterized bythat the disc-shaped insulating body (5) is formed in one part or in several parts. [5] Insulating body arrangement (2) according to one of the preceding claims, characterized by that the engagement elements (11, 12) are designed as z-shaped step elements, wherein the step elements of an individual element (8-x) are designed in an inverted z-shape to one another. [6] Insulating body arrangement (2) according to one of the preceding claims, characterized by that the radially extending insulating body (8) has at least four of the individual elements (8-x). [7] Insulating body arrangement (2) according to one of the preceding claims, characterized by that the radially extending insulating body (8) has flat contact and support surfaces (14, 17) on both sides. [8] Electric machine (4), characterized bythat the electrical machine (4) comprises a rotor arrangement and a stator (3) with the insulation arrangement (2) according to at least one of the preceding claims. [9] Motor vehicle (1), characterized by that the motor vehicle (1) comprises the electric machine (4) according to claim 8. [10] Method for producing an insulating body arrangement (2) of a stator (3) for an electrical machine (4), comprising: - Provide: - a disc-shaped insulating body (5) with flat contact and support surfaces (6), and - a radially extending insulating body (8) with radial and circular contact and bearing surfaces (9), wherein the radially extending insulating body (8) has a plurality of identical individual elements (8-x) and engaging elements (11, 12) are formed at the ends of the individual elements (8-x), which engage with one another in such a way as to connect the individual elements (8-x) to one another and to form a gap (13) between the individual elements (8-x), and - Assembling the insulation body arrangement (2) such that the disc-shaped insulation body (5) is arranged on an inner end face (7) of the stator (3) and such that the radially extending insulation body (8) is arranged on an inner wall (10) extending in the circumferential direction of the stator (3) and adjacent to the disc-shaped insulation body (5).

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