Method and injection mold for manufacturing an active part of an electric machine, active part, electric machine and motor vehicle

Abstract

The invention relates to a method and an injection mold for manufacturing an active part (A), such an active part (A), an electric machine comprising the active part (A), and a motor vehicle comprising the electric machine. To manufacture the active part (A), an active part body (1), which has active part teeth (2) wound with wire windings (4), is arranged in a mold (5) of an injection mold. A groove (3) of the active part body (1), formed by two active part teeth (2) adjacent to each other in the circumferential direction of the active part body (1), is fluidically sealed at its radial groove opening side (7) by means of a radially sealing mold element (6) of the mold (5). By means of the injection mold, the groove (3) sealed by means of the mold element (6) is completely filled with a liquid or pasty potting compound (9), after which the potting compound (9) reacts to form a dimensionally stable groove filler body (10) of the active part (A).

Description

[0001] The present invention relates to a method for manufacturing an active part – that is, a rotor and / or a stator – of an electric machine. The invention further relates to an injection mold configured for carrying out the method. The invention also relates to an active part for an electric machine manufactured by means of the method and / or the injection mold. The invention further includes an electric machine comprising the active part as a rotor and / or a stator, and a motor vehicle equipped with such an electric machine.

[0002] Electrical machines have a stator and a rotor as their active components. Between two teeth that are adjacent to each other in the circumferential direction of the respective active component, a groove or a radially open space between the teeth is formed. During the manufacturing of the electrical machine, the spaces between the teeth or grooves are filled with a potting compound to secure the wire windings wound around the teeth. To facilitate the potting process, so-called cover slides are known for rotors and so-called slot-locking wedges for stators, which are inserted axially into a corresponding cover slide or slot-locking wedge seat in the axial direction of the rotor or stator of the electrical machine. A problem with inserting the conventional cover slide / slot-locking wedge is that a chip can be lifted from the cover slide by the metal rotor or stator lamination stack during the insertion process.If a chip goes undetected, it can cause damage during operation of the electric machine, for example, by being sucked into a cooling or lubricant pump. Therefore, considerable effort is currently required in the manufacture of an electric machine to both prevent chips from being lifted from the slide and to inspect the machine for any unwanted chips that may have been lifted from the slide.

[0003] DE 10 2020 111 542 A1 discloses a method for potting a rotor for an electric machine using an injection mold. The rotor comprises a rotor body and a rotor winding applied thereto. A radial seal is attached to the rotor on the rotor side – not on the mold side. The rotor is then positioned axially perpendicular to the mold in an injection mold that has two mold plates. An injection molding process then takes place, in which a heated potting compound is injected into the rotor winding through one or both of the mold plates. The potted rotor is then removed from the injection mold. The radial seal remains as an integral element on the rotor.

[0004] DE 10 2020 111 333 A1 also proposes a method for potting a rotor for an electric machine, wherein the rotor is potted in several successive steps from different filling directions with two different potting compounds, namely a first and a second potting compound. The rotor is placed upright in a potting mold, after which a first portion of the first potting compound is poured into the mold. Then a second potting compound is poured into the mold, and then a second portion of the first potting compound is poured into the mold.

[0005] Another method for manufacturing a stator for an electric machine is disclosed in DE 10 2018 132 501 A1, wherein a potting body with a nozzle is inserted into the stator via a first end face and a potting counter-body via a second end face. The stator is then potted by introducing potting material through the nozzle.

[0006] The object of the present invention is to simplify the manufacture of an electric machine.

[0007] This problem is solved by the subject matter of the independent claims. Further possible embodiments of the invention are disclosed in the dependent claims, the description, and the figures. Features, advantages, and possible embodiments set forth in the description for one of the subject matter of the independent claims are to be regarded, at least analogously, across categories and embodiments as features, advantages, and possible embodiments of the respective subject matter of the other independent claims, as well as of any possible combination of the subject matter of the independent claims, optionally in conjunction with one or more of the dependent claims.

[0008] The invention proposes a method for manufacturing an active part of an electric machine. For carrying out this method, a suitably configured injection mold, in particular a compression mold, is proposed according to the invention. The invention further includes an active part for an electric machine, that is, a stator or a rotor, which is manufactured using the method or injection mold according to the invention. In its intended installation position, the active part forms a component of an electric machine according to the invention. In other words, the electric machine according to the invention has the active part as a rotor or as a stator, or the electric machine has a first active part designed as a rotor and a second active part designed as a stator. Furthermore, a motor vehicle according to the invention is proposed that incorporates such an electric machine.In particular, the electric machine is a traction machine for the motor vehicle, which means that the motor vehicle is in particular a purely or hybrid-electrically powered motor vehicle.

[0009] In this process, an active part is positioned or inserted into a mold of the injection mold. The active part has teeth wound with wire coils. Two adjacent teeth, located circumferentially, define a groove in the active part. This groove is fluidically sealed at its radial opening side by means of a radially sealing element in the mold, for example, by inserting the active part into the corresponding mold. The groove, sealed by the radially sealing element, is then completely filled with a liquid or paste-like potting compound. Typically, only a single potting compound is used. This compound can have two or more components. For example, the potting compound may be a mixture or blend of these two or more components.Furthermore, the groove is completely filled with the potting compound, particularly by means of a single, continuous filling or injection of the compound into the groove, especially using an injection molding process. For this process, a highly thermally conductive, non-magnetic or non-magnetizable material is selected as the potting compound, for example, an injection-moldable or castable plastic material. According to one possible embodiment, the potting compound is a thermoset. The potting compound filled or injected into the groove reacts—especially spontaneously—to form a dimensionally stable groove filler of the active part, which secures the wire winding in the groove. To accelerate curing and / or to promote particularly high-quality curing, curing energy can be supplied to the potting compound, for example, in the form of curing heat.

[0010] Due to the process, manufacturing the active component is particularly efficient and simple. The need to provide and assemble a conventional cover slide during the manufacturing of the active component, and consequently during the manufacturing of the electric motor, is completely eliminated. Therefore, in this further development, the active component manufactured using this process is free of a groove closure body produced separately from the potting compound, and in particular, free of a conventional cover slide as known from the prior art. Thus, the active component has a particularly low component count and can be manufactured with advantageously few individual process steps. In contrast to a vacuum die-casting process, the injection molding of the potting material is simpler and more energy-efficient. Furthermore, the process creates a particularly stable active component, as the cured potting material...The dimensionally stable slot filler conforms particularly closely to the wire windings, thus ensuring they are securely fixed in position. Furthermore, this results in exceptionally efficient heat transfer between the wire windings, the slot filler, and the laminated core of the corresponding active component, making heat dissipation from the wire windings particularly efficient during operation of the electric machine containing such an active component. Especially when manufacturing a stator using this method or injection mold, it is advantageous that the final positioning of the wire windings is achieved simultaneously with the injection and curing of the potting compound.It is no longer necessary to impregnate the stator body in the conventional way, which involves laboriously applying a potting compound to the inside while rotating and / or axially tilting the stator body, resulting in wasted potting compound. Therefore, the process is also particularly environmentally friendly and resource-efficient.

[0011] In a possible further development, the groove of the active part body is individually sealed using the radially sealing mold element. If the active part has two or more grooves, this further development prevents the flow of potting compound from one groove to another. Furthermore, no potting compound can reach another location on the active part via the radial groove opening, thus effectively preventing unwanted contamination of the active part due to potting compound that has leaked from the groove. This simplifies the manufacturing of the active part even further, as no steps are required to remove potting compound that has leaked radially from the groove.

[0012] In a possible alternative development process, when sealing the groove in the mold—for example, when positioning the active part body in the mold—a radial gap is created between the mold and the radial side of the groove. The liquid or pasty potting compound is then poured into this gap. The potting compound, positioned or poured into this radial gap, reacts to form a dimensionally stable radial cover element of the active part. This eliminates the need to produce and assemble a separate radial cover element—such as a slotted tube in the case of a stator—resulting in an even simpler structure and easier manufacturing of the active part. In such a case, the mold has a particularly simple geometry.By injection molding, particularly injection molding or transfer molding processes, the radial deck element can be reliably produced with a particularly small radial thickness of less than 1 mm, especially less than 0.5 mm, for example 0.25 mm. This allows for the production of a particularly small air gap between the inside of the stator and the outside of the rotor, while the potting material compensates for manufacturing tolerances of a stamped stator lamination stack on the inside of the stator, resulting in a particularly smooth stator surface. This exceptionally smooth surface reduces air friction during operation of the electric machine compared to a conventional stator.

[0013] Another possible embodiment provides that the groove of the active part body is fluidically sealed by means of an axially sealing element of the mold at its axial groove opening side. In particular, the mold has such an axially sealing element at each axial end of the active part body, so that the groove can be sealed on both sides along its longitudinal direction by means of the mold. This prevents potting compound from escaping unintentionally through the axial groove opening to another location, especially the end face, of the active part. This further simplifies the production of the active part, as no steps are required to clean it of potting compound that has escaped axially from the groove.

[0014] A possible alternative involves creating an axial gap between the groove and an axial side of the groove opening when sealing it in the mold. The liquid or pasty potting compound is then poured into this gap. The potting compound cures there to form a dimensionally stable axial cover element of the active part. This is particularly advantageous when the active part being manufactured is a stator, as its stator windings form winding heads on the end faces. In this process, the winding heads (which are arranged at an axial gap or extend axially on both sides of the active part) are embedded in the potting compound and consequently held stably in position by the potting compound that has cured at the axial gap – that is, by the axial cover element.Furthermore, it is no longer necessary to manufacture and assemble a separate axial cover element from the potting compound – in the case of a stator, for example, an axial cover disc – which gives the active part an even simpler structure and makes it even easier to manufacture.

[0015] According to another possible embodiment, a functional element is arranged in the groove of the active part body and embedded in it by filling the groove with the potting compound. The functional element could be, for example, a temperature control element, in particular a cooling channel through which a coolant flows. Furthermore, the functional element could be part of the sensor system of the electric machine, for example, an accelerometer, a temperature sensor, etc. The functional element is held particularly securely in position by means of the dimensionally stable groove filler or by means of the cured / cured potting compound.

[0016] According to another possible embodiment, to position the active part body in the mold, the mold is adjusted into an arrangement position by radial and / or axial expansion. To seal the groove, the mold is adjusted from its arrangement position into a sealing position by radial and / or axial narrowing. This makes inserting or arranging the active part body into the injection mold, i.e., into its mold shape, particularly easy. The mold shape of the injection mold is therefore adjustable between the arrangement position and the sealing position, for example, by being designed in multiple parts, especially for radial expansion along an inner circumferential direction corresponding to an outer circumferential direction of the active part body. For axial expansion, an axial end part (e.g., a cover) of the mold can be removed from the other parts of the mold.The parts of the mold are therefore movable relative to each other, for example by means of a suitable actuator. Alternatively or additionally, the mold can be hydraulically and / or pneumatically adjustable between the assembly position and the sealing position by being inflated or pumped with a fluid (gas or liquid) to move it from its assembly position to its sealing position. In such a case, the mold is reversibly elastic.

[0017] Another possible embodiment provides that the potting compound is pressurized to fill the groove and / or during the curing process. For this purpose, it is specifically provided that the mold shape is adjusted to a pressurization position by radial and / or axial narrowing, particularly starting from the sealing position. The means described in connection with the preceding embodiment are suitable for this. In this respect, the mold shape of the injection mold is not only adjustable from the assembly position to the sealing position and vice versa, but also from the sealing position to the pressurization position and vice versa. In particular, the mold shape can be adjusted directly from the pressurization position to the assembly position. Furthermore, the potting compound filled into the groove can be injected by means of an injection unit (for example, a material pump, an extruder, etc.).The injection mold is pressurized. This pressurization ensures that the potting compound is filled into the groove particularly efficiently, and / or that the potting compound hardens into a particularly dense and consequently stable groove filler.

[0018] Further features of the invention may become apparent from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features shown below in the description of the figures and / or in the figures themselves, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention.

[0019] The drawing shows in: Fig. 1 a partial view of an active part (here for a rotor) of an electric machine, wherein a groove bounded by two active part teeth (here rotor teeth) adjacent in the circumferential direction of the active part is completely filled with a dimensionally stable groove filler made of a potting material, Fig. 2 a partial view of an active part (here for a stator) of an electrical machine, wherein a groove bounded by two active part teeth (here stator teeth) adjacent in the circumferential direction of the active part is completely filled with a dimensionally stable groove filler made of a potting material, and Fig. 3 a partial view of an active part for a stator, wherein one stator inner surface is coated with the potting compound.

[0020] In the figures, identical and functionally equivalent elements are marked with the same reference symbol.

[0021] Fig. 1 and Fig. Figures 2 each show a partial view of an active part body 1, which is produced by means of a method for manufacturing an active part A - that is, for manufacturing a rotor R (see Figure 2). Fig. 1) or a stator S (see Fig. 2) - is further developed into an electrical machine. In Fig. Figure 1 shows an active part body 1 designed as a rotor body 1a, whereas in Fig. Figure 2 shows an active part body 1 designed as a stator body 1b. The electric machine (not shown) is configured here as a traction machine for a motor vehicle (not shown). Therefore, the active part A, in its intended installation position, forms a component of the electric machine and consequently of the motor vehicle. To manufacture the active part A, the corresponding active part body 1 is provided, which has active part teeth 2 spaced apart from one another along its circumference. A groove 3 along the circumference is defined by each pair of circumferentially adjacent active part teeth 2. Therefore, the active part A has a plurality of such grooves 3 along its circumference. In the figures...It can also be seen that the respective active part tooth 2 is wound with a wire winding 4, such that a portion of the wire winding 4, consisting of conductors or wires that may have a circular or non-circular cross-section, is arranged in the slot 3. In the context of the active part A, designed as a stator S, "wound with a wire winding 4" means that wires or conductors are inserted into the slots 3 of the stator S as intended. It is... Fig. As can be seen from Figure 1, the wire windings 4 can be arranged on the respective active part tooth 2 by means of a winding aid or a winding aid body 2a. The active part body 1 prepared in this way is then inserted into a mold 5 of an injection mold. The injection mold is specially designed for carrying out the process, and its mold 5, according to the present example, is selectively adjustable into an arrangement position, a sealing position, and a pressurization position, for example, by means of a suitable actuator. To arrange the active part body 1, the mold 5 is adjusted to its arrangement position, in which it is radially and / or axially expanded compared to the sealing position, so that the active part body 1 can be inserted into the injection mold with particularly little effort.

[0022] The groove 3 is then fluidically sealed by means of a radially sealing form element 6 of the tool shape 5 on a radial groove opening side 7 (r in the figure denotes a radial direction of the corresponding active part A or active part body 1). Fig. 1 and Fig. Figure 2 shows that each groove 3 is individually radially sealed by means of the molded element 6, which means that the grooves 3 are radially sealed from each other. In this case, the groove 3 of the active part body 1 is fluidically sealed at an axial groove opening side 8 of the groove 3 by means of a further axially sealing molded element (not shown). Fig. 2 and Fig. (The axial groove opening side 8 is not visible to the observer, as it is covered by wire windings 4). To create the seal of the grooves 3, the tool shape 5 is radially and / or axially narrowed in this example, thereby changing it from the arrangement position to the sealing position. The forming element 6 then conforms to the active part body 1, in particular to its groove 3 or grooves 3, such that the forming element 6 forms a temporary closure of the respective groove 3 on the radial groove opening side 7.

[0023] A liquid or pasty potting compound 9 – in this example a thermoset – is then injected into the respective groove 3, which is sealed by means of the mold 5 or the radially sealing mold element 6 and, if applicable, the axially sealing mold element, using the injection mold. In particular, it is intended that all grooves 3 are filled simultaneously with the potting compound 9 by means of a single, continuous filling or injection. The potting compound 9 is heated for filling / injecting into the grooves 3, for example, so that it is flowable, in particular suitable for machine injection. The potting compound 9 introduced into the grooves 3 reacts to form a dimensionally stable, in particular rigid, groove filler 10, for example, by the heated and thus flowable potting compound 9 cooling below the solidification temperature of the potting compound material or the thermoset. The groove filler 10 functions, on the one hand, as a respective groove closure for the groove 3.grooves 3 and, on the other hand, as a fixing element that positionally fixes the wire windings 4 to the active part teeth 2.

[0024] In the present example, the potting compound 9 is pressurized during the filling of groove 3 and / or during / for the curing process. This pressure exceeds that required to introduce the potting compound 9 into groove 3. Pressurization is achieved, for example, by adjusting the mold 5 into a pressurized position through radial and / or axial narrowing. Alternatively or additionally, a fluidic or material-locking connection is temporarily maintained between the potting compound 9 located in an injection unit of the injection mold and the potting compound 9 in groove 3, in order to pressurize the potting compound 9 in groove 3 using the injection unit (e.g., an extruder).

[0025] The active part A, which has the grooves 3 filled with the potting compound 9, i.e., the groove fillers 10, is then removed from the injection mold or its mold 5. To facilitate removal of the active part A from the injection mold, the mold 5 is moved from the sealing position to the assembly position in this example. The active part A produced by this method, i.e., the rotor R or the stator S, does not have a groove closure element produced separately from the potting compound, i.e., no cover slide or the like. When the active part A is removed from the mold 5, the radially sealing element 6 and the axially sealing element remain completely attached to / in the injection mold.

[0026] In this example, a functional body 11 (only in) is inserted into the groove 3 of the active part body 1 before or during its filling with the potting compound 9. Fig. (1 indicated) is arranged and embedded in the groove 3 by filling it with the potting compound 9. The potting compound 9, which has reacted, i.e., solidified or cooled, thus filling the groove, fixes the functional element 11 in position within the groove 3. The functional element 11 is, for example, a temperature control element, in particular a cooling channel through which a coolant flows. Furthermore, the functional element 11 can be part of a sensor system for the electric machine, such as an accelerometer, a temperature sensor, etc.

[0027] Up to this point, a first method variant has been described for how the active part A can be manufactured. Fig. Figure 3 shows a partial view of an active part A for a stator S, where one stator inner surface 12 is coated with the potting compound 9. Only the differences to the first process variant are discussed. The process variant for manufacturing the in Fig. The active part A shown in Figure 3 differs from the first method variant in that, when sealing the groove 3 in the tool mold 5, a radial gap 13 is formed between this and the radial groove opening side 7 of the groove. Potting compound 9 is poured into the radial gap 13 while filling the groove 3, where it reacts to form a dimensionally stable radial cover element 14 of the active part A. For the in Fig. In the stator body 1b shown in Figure 3, the radial cover element 14 acts as a replacement for the slotted tube. The tool shape 5 has a particularly simple geometry in this case, specifically a straight-circle cylindrical outer contour. Here, the radial cover element 14 is designed with a radial thickness of less than 1 mm, in particular less than 0.5 mm, for example 0.25 mm.

[0028] Alternatively or additionally to providing the radial gap 13, a third method variant is conceivable. Only the differences between the third and first method variants are described. The third method variant differs from the first in that an axial gap (not shown; perpendicular to the plane of the drawing) is formed between the groove 3 and the axial groove opening side 8 when sealing it in the tool mold 5. Potting compound 9 is poured into this axial gap while filling the groove 3. The potting compound 9 poured into the axial gap reacts there to form a dimensionally stable axial cover element of the active part A. If the active part A to be produced is a stator S, the wire windings 4 of the stator S (see figure) form Fig. 2 and Fig.3) Winding heads 15 on the end faces of the stator S. In the third method variant, the winding heads 15 (which are arranged at axial intervals) are embedded in the potting compound 9 and consequently held stably in position by means of the potting compound 9, which has hardened at axial intervals – that is, by means of the axial cover element. If the active part A to be manufactured is a rotor, the potting compound 9 poured into the axial interval forms an axial cover element – ​​for example, an axial cover disc.

[0029] The invention is based on the following concepts: When using appropriately high-strength potting materials, in particular thermosets in transfer molding or injection molding processes, the grooves 3 in the lamination stack of the active part body 1 and the positional fixation of the wire windings 4 can be closed using forming tools. After winding and, if necessary, electrically contacting the active part A (for example, a rotor lamination stack), the partially assembled active part A, i.e., the active part body, is inserted / placed in the injection mold, which is at least similar to a transfer molding, injection molding, or compression molding tool. For example, by means of a transfer molding or compression molding process, the cavities formed between the mold 5 and the active part body 1, in particular grooves 3, are filled with the potting compound 9.The tool 5 seals against the lamination stack in such a way that the groove 3 is filled and thus closed during the process. Through the targeted selection of the potting compound 9, a particularly stable and high-strength groove filler 10 is created after the potting compound 9 has reacted, cooled, and cured, thereby improving the positional fixation of the wire windings 4. The production and assembly of a separate groove closure is eliminated during the assembly process. Problems that occurred during conventional manufacturing, such as leaks between the groove closure and the lamination stack and / or support ring, are also eliminated. Furthermore, a particularly thermally conductive potting compound 9 can be selected, which improves heat dissipation and thus the continuous performance of the electric machine during operation. The transfer molding process is easier to handle than conventional groove filling methods, such as vacuum pressure casting. List of reference symbols 1 active part body 1a Rotor body 1b Stator body A Active part R Rotor (active part) S Stator (active part) 2 active part tooth 2a Winding aid 3 groove 4 wire winding 5 Tool shape 6 Form element 7 radial groove opening side 8 axial groove opening side 9 Potting compound 10 groove fillers 11 Functional bodies 12 Stator inner side 13 Radial spacing 14 radial deck element 15 winding head r radial direction QUOTES INCLUDED 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 2020 111 542 A1

[0003] DE 10 2020 111 333 A1

[0004] DE 10 2018 132 501 A1

[0005]

Claims

[1] Method for producing an active part (A) of an electrical machine, wherein - an active part body (1) having active part teeth (2) wound with wire windings (4) is arranged in a tool mold (5) of an injection mold, - a groove (3) of the active part body (1), which is formed by two of the active part teeth (2) adjacent to one another in the circumferential direction of the active part body (1), on the radial groove opening side (7) of which groove teeth is fluidically sealed by means of a radially sealing shaped element (6) of the tool mold (5), - the groove (3) sealed by means of the shaped element (6) is completely filled with a liquid or pasty casting compound (9) by means of the injection molding tool, - the casting compound (9) reacts to form a dimensionally stable groove filling body (10) of the active part (A). [2] Method according to claim 1, characterized bythat the groove (3) of the active part body (1) is individually sealed by means of the radially sealing shaped element (6). [3] Method according to claim 1, characterized by that when sealing the groove (3) in the tool mold (5) between this and the radial groove opening side (7) of the groove (3) a radial distance (13) is formed, into which radial distance the liquid or pasty casting compound (9) is filled while filling the groove (3), where it reacts to form a dimensionally stable radial cover element (14) of the active part (A). [4] Method according to one of the preceding claims, characterized by that a thermosetting plastic is used as the casting compound (9). [5] Method according to one of the preceding claims, characterized by that the groove (3) of the active part body (1) is fluidically sealed by means of an axially sealing shaped element of the tool mold (5) on its axial groove opening side (8). [6] Method according to one of claims 1 to 4, characterized bythat when sealing the groove (3) in the tool mold (5) between this and an axial groove opening side (8) of the groove (3) an axial distance is formed, into which while filling the groove (3) with the liquid or pasty casting compound (9) the latter is filled, where it reacts to form a dimensionally stable axial cover element of the active part (A). [7] Method according to one of the preceding claims, characterized by that a functional body (11) is arranged in the groove (3) of the active part body (1), which is embedded in the groove (3) by filling it with the casting compound (9). [8] Method according to one of the preceding claims, characterized byin that, in order to arrange the active part body (1) in the tool mould (5), the latter is adjusted into an arrangement position by radial and / or axial widening, and in order to seal the groove (3), the tool mould (5) is adjusted from its arrangement position into a sealing position by radial and / or axial narrowing. [9] Method according to one of the preceding claims, characterized by that in order to fill the groove (3) with the casting compound (9) and / or when the casting compound (9) is reacting, the casting compound (9) is subjected to pressure, in particular by adjusting the tool mold (5) into a pressurization position by radial and / or axial narrowing. [10] Injection molding tool configured to carry out the method according to any one of claims 1 to 9. [11] Active part (A) for an electrical machine, which is produced by means of a method according to one of claims 1 to 9. [12] Active part (A) according to claim 11, characterized by that it does not have a slot closure body manufactured separately from the casting compound (9), in particular no cover slide and no slot closure wedge. [13] Electrical machine having the active part (A) designed according to claim 11 or 12 as rotor (R) and / or as stator (S). [14] Motor vehicle with an electric machine designed according to claim 13.

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