Ventilator ring disc for a rotor of an electric machine, rotor comprising such a ventilator ring disc, electric machine, and motor vehicle

Abstract

The invention relates to a ventilator ring disc (1), to a rotor (2), to an electric machine (3), and to a motor vehicle. Blades (9) of a blade assembly (8) of the ventilator ring disc protrude radially outwards from a base ring part (6) of the ventilator ring disc (1) and are radially outwardly connected together by means of an outer ring part (7) of the ventilator ring disc (1). Through-opening (10) are delimited, in each case, by the base ring part (6) and by the outer ring part (7) in the radial direction and, along the circumferential direction, by two blades, which directly adjoin each other along the circumferential direction, of the blades (9). A groove assembly (14) of the ventilator ring disc (1) has end-face grooves (15) at a ventilator ring disc (1) end face (12), which is defined as the suction side (4) with respect to a specified main rotational direction (11) of the ventilator ring disc (1), said grooves extending radially outwards from the base ring part (6). Alternatively or in addition thereto, the groove assembly (14) has circumferential grooves (16) on the outer circumferential surface (17) of the outer ring part (7), said circumferential grooves extending diagonally to the longitudinal central axis (18) of the ventilator ring disc (1).

Description

[0001] Fan ring disc for a rotor of an electrical machine, rotor with such a fan ring disc, electrical machine and motor vehicle

[0002] The present invention relates to a fan ring disk for a rotor of an electrical machine, a rotor having such a fan ring disk, an electrical machine having such a rotor, and a motor vehicle having such an electrical machine.

[0003] To achieve particularly advantageous operation of an electrical machine, it is necessary to cool the active parts (rotor and stator). For example, it is known to direct a coolant, such as gear oil, close to the winding slots or through the winding slots to cool the stator. These approaches aim to cool the stator yoke. However, stator teeth between the winding slots are difficult to cool due to the limited space available. To cool the rotor, it is known to design its rotor shaft as a hollow shaft and to allow the coolant to flow through the hollow rotor shaft during operation of the electrical machine. Rotor magnets, which also require cooling, are often arranged close to an outer circumferential surface of the rotor, which makes their cooling particularly difficult.Approaches to direct coolant through the rotor close to the magnet, i.e. radially far outwards, must be critically evaluated with regard to the influence of centrifugal force and the tightness of the arrangement due to the increased mass of the rotor radially outwards. Another known option for cooling the active parts of the electric machine is to design the electric machine as a wet-running machine, in which the coolant is brought into direct contact with the rotor and / or the stator in an active parts chamber during operation. In this case, the rotation of the rotor causes the coolant in the active parts chamber to atomize and, due to air turbulence in the active parts chamber, to enter an annular air gap arranged between the rotor and stator. This leads to braking of the rotor rotation and increased internal friction in the electric machine, and consequently to inefficient operation.

[0004] DE 42 42 132 A1 proposes an electrical machine in which an internal fan is arranged on the rotor shaft of the electrical machine on each of the two end faces of its rotor, and rotor cooling channels extending over its full axial length are provided in the rotor core, wherein the conveying effect exerted by the internal fan on the cooling medium located in these rotor cooling channels is at least reduced on one rotor end face for some of the rotor cooling channels in one conveying direction and on the other rotor end face for another part of the rotor cooling channels in the other conveying direction.

[0005] Furthermore, DE 7424 155 U proposes a fan with a blade element, wherein the blade element is carried by a rotor shaft of an electric motor.

[0006] CH 71511 A discloses a cooling device for rotating-field motors with a special rotor for driving a fan. This rotor is arranged in a stray field of the stator coil ends.

[0007] The object of the present invention is to improve the cooling of active parts of electrical machines.

[0008] This problem is solved by the subject matter of the independent claims. Further possible embodiments of the invention are disclosed in the subclaims, the description, and the figures. Features, advantages, and possible embodiments presented in the description for one of the subject matter of the independent claims are to be regarded, across categories and embodiments, at least analogously as features, advantages, and possible embodiments of the respective subject matter of the other independent claims, as well as any possible combination of the subject matter of the independent claims, optionally in conjunction with one or more of the subclaims.

[0009] According to the invention, a fan disk for a rotor of an electrical machine is proposed. Furthermore, the invention proposes a rotor for the electrical machine, which has a rotor shaft on which the fan disk is mounted in a rotationally fixed and axially fixed manner (i.e., immovable both rotationally and translationally with respect to the rotor shaft). This means that the fan disk, in its intended installation position, forms a component of the rotor. Furthermore, the invention includes an electrical machine, which has the rotor and, consequently, the fan disk as components. In its intended installation position, the electrical machine forms a component of a motor vehicle according to the invention, wherein the electrical machine is designed, in particular, as a traction machine of the motor vehicle.This means that the motor vehicle according to the invention is in particular a purely or hybrid electric motor vehicle.

[0010] The fan ring disc has an inner base ring portion and an outer outer ring portion, which are radially spaced from one another. Furthermore, the fan ring disc has blades whose blades project radially outward from the base ring portion and are connected to one another there, i.e., radially outward, by the outer ring portion. To this extent, the ring portions are radially spaced from one another by the blades of the blading. Furthermore, the fan ring disc has through-openings, each through-opening being radially delimited by the base ring portion and the outer ring portion. Furthermore, each through-opening is delimited along the circumferential direction by two blades that are directly adjacent to one another along the circumferential direction.Each through-opening forms a material-free space in the fan disk, allowing a fluid to flow axially through the fan disk by flowing through one or more of the through-openings. A primary rotation direction is specified for the fan disk, which, in conjunction with the shape and orientation of the blades, results in a suction side and a pressure side for the fan disk relative to the primary rotation direction. Therefore, when the fan disk is rotated in the primary rotation direction, a fluid located on the suction side of the fan disk is sucked in and transported by the blades through the through-openings to the pressure side of the fan disk.The fan ring disc further comprises a groove arrangement that has end-face grooves on an end face of the fan ring disc defined as the suction side, which extend radially outward from the base ring portion. Alternatively or additionally, the groove arrangement comprises circumferential grooves on an outer circumferential surface of the outer ring portion, which extend obliquely to a longitudinal center axis of the fan ring disc.

[0011] Overall, the fan ring disc is essentially flat, i.e. a radius or a diameter of the fan ring disc is dominant over an axial strength / thickness of the fan ring disc.

[0012] In the rotor, which has the rotor shaft on which the fan disk is mounted for rotation, the suction side of the fan disk faces away from one end face of a rotor core, so that the corresponding end face of the rotor core and the pressure side of the fan disk face each other. Depending on requirements, an upside-down arrangement of the fan disk is of course conceivable. It is also conceivable for a respective fan disk to be arranged on each of the axial end faces of the rotor.

[0013] When the electrical machine is in operation, i.e. when the rotor is rotated, the air is blown axially towards the rotor laminated core by means of the blading of the fan disk, which rotates with the rotor or rotor shaft. As a result, the air flows through an annular air gap, via which the rotor and a stator of the electrical machine are radially spaced from one another. This achieves particularly advantageous surface cooling of the rotor and stator. In order to further promote an air flow in the annular air gap that is advantageous for cooling, a further development of the rotor or electrical machine can provide that at one end or on one end face of the rotor the fan disk borders on the pressure side of the rotor laminated core, whereas a further fan disk borders on the suction side of the rotor laminated core on an opposite end face of the rotor laminated core.In addition to the cooling effect, the air flow through the annular air gap causes unwanted substances, such as coolant, to be flushed or blown out of the annular air gap. This is particularly advantageous when the electric machine is designed as a wet-running machine, where coolant, in particular gear oil, comes into direct contact with the stator and rotor of the electric machine during operation. Due to the rotation of the rotor, the coolant or gear oil is atomized and thus enters the annular air gap. In addition, oil drips from any existing winding overhang cooling of the stator and also enters the air gap. The oil would deposit in the air gap and thus lead to increased friction loss between the rotor and stator.By blowing the transmission oil out of the air ring gap by means of the air flow, the internal friction between the rotor and the stator of the electric machine is advantageously reduced.

[0014] Due to the groove arrangement of the fan disk, the amount of coolant or gear oil that flows into the air gap when the electric machine is in operation, i.e. when the rotor is rotating, is reduced from the outset. This is because the gear oil or coolant flows into the front grooves of the fan disk and is accelerated radially outwards by the rotating fan disk, thereby preventing or reducing the penetration of this coolant into the air gap. The same applies to the circumferential grooves of the groove arrangement, into which coolant flows. Due to the angled position of the circumferential grooves, this coolant is directed away from the air gap, in particular away from the rotor laminated core, i.e. towards the suction side of the fan disk. None of the grooves open into one of the through openings.

[0015] Thanks to the fan ring disc, particularly efficient and advantageous cooling of the active parts (rotor and stator) of the electrical machine is ensured, while an undesirable increase in friction caused by a medium, in particular coolant, between the rotor and the stator is avoided.

[0016] To enhance the just-explained advantages of the fan disk, a possible refinement of the electric machine provides for an outer diameter of the fan disk to be equal to or greater than the inner diameter of the stator of the electric machine. In other words, the fan disk projects radially beyond the rotor core, so that the axial air gap, across which the rotor and stator are radially spaced from each other, is axially covered or concealed by the fan disk, in particular its outer ring portion.

[0017] According to a possible refinement of the fan ring disc, the groove arrangement on the end face defined as the suction side has an annular groove that intersects and connects the end-face grooves. This further promotes the radial discharge of the coolant in wet-running machines.

[0018] In another possible embodiment, the end-face grooves and / or the blades of the blading are arranged obliquely with respect to a radius of the fan disk. In particular, the grooves and / or blades are inclined backwards with respect to the main direction of rotation. The obliquely arranged or backward-inclined grooves make the discharge of the coolant on the suction side of the fan disk even more efficient. The obliquely arranged, in particular backward-inclined blades ensure that, during operation of the electric machine, the air is directed particularly efficiently to the pressure side of the fan disk and consequently into the air gap. Alternatively or in addition to the oblique position or backward inclination of the grooves and / or blades, the circumferential grooves are arranged obliquely with respect to a longitudinal center axis of the fan disk, in particular rising to the left.This further promotes the removal of coolant from the outer peripheral surface of the fan disk. Due to the left-hand slope of the circumferential grooves, the coolant is forced away from the rotor core when the fan disk rotates in the main direction of rotation.

[0019] In another possible embodiment of the fan ring disc, it is provided that it is made entirely or partially of plastic. This means that the base ring portion and / or the blading and / or the outer ring portion can be made of plastic, for example as a (respective) injection-molded part or as a (respective) injection-molding or transfer-molding part. In particular, it is provided that the base ring portion, the outer ring portion, and the blading are manufactured as an integral and monolithic component, in particular by injection molding. By using plastic in the manufacture of the fan ring disc, it can be manufactured particularly easily and / or with little effort. In addition, the fan ring disc is particularly lightweight, which means it retains its shape and stability - even at high speeds.Furthermore, due to the production of the fan ring disk by injection molding or transfer molding, there is advantageously considerable design freedom in the conception of the fan ring disk. Furthermore, it is conceivable for the fan ring disk to be formed entirely or partially from a metallic material, in particular from a metal or a metal alloy. In such a case, the fan ring disk can be designed, for example, as a deep-drawn part. According to a further possible embodiment, the fan ring disk has a balancing disk for the rotor shaft of the electric machine, wherein the balancing disk and the base ring portion are directly and coaxially connected to one another. In a possible further development, it is provided that the base ring portion, in particular together with the outer ring portion and the blading, is injection-molded onto an outer peripheral surface of the balancing disk or pressed onto the outer peripheral surface of the balancing disk.If the fan ring disc is made of metallic material, additional fastening or connection methods between the fan ring disc and the balancing disc are possible. For example, it is conceivable to weld, screw, rivet, etc. the fan ring disc and the balancing disc together. Regardless of the material of the fan ring disc, adhesive bonding represents another alternative or supplementary fastening method. Because the base ring section and the balancing disc are arranged coaxially to one another, no separate axial installation space needs to be provided for the fan ring disc when designing or constructing the electrical machine. Instead, the outer ring section, the base ring section, the blading, and the balancing disc share a common axial installation space of the electrical machine, which particularly takes into account the idea of ​​an axially particularly compact electrical machine.

[0020] Further features of the invention may emerge 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 alone, can be used not only in the respective combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0021] The drawing shows

[0022] Fig. 1 is a perspective view of a fan ring disc looking at its pressure side,

[0023] Fig. 2 is a perspective view of the fan ring disc looking at its suction side, Fig. 3 is a perspective detailed view of a geometry of the pressure side of the fan ring disc,

[0024] Fig. 4 is a perspective view of a rotor for an electrical machine, wherein the fan ring disc is seated on a rotor shaft of the rotor, and

[0025] Fig. 5 is a perspective and partially sectioned view of a portion of an electrical machine whose rotor is equipped with the fan ring disc.

[0026] A fan disk 1, a rotor 2 having the fan disk 1, an electric machine 3 having the rotor 2, and a motor vehicle (not shown) having the electric machine 3 are explained in a joint description below. In the figures, identical and functionally identical elements are provided with the same reference numerals.

[0027] Fig. 1 shows a perspective view of the fan ring disk 1 looking towards its pressure side 4, whereas Fig. 2 shows a perspective view of the same fan ring disk 1 looking towards its suction side 5. It can be seen in Fig. 1 and Fig. 2 that the fan ring disk 1 has a base ring portion 6 and an outer ring portion 7, which are arranged coaxially to one another and radially spaced from one another. Furthermore, the fan ring disk 1 has blading 8, the blades 9 of which project radially outwards from the base ring portion 6 and are connected to one another radially outwards by means of the outer ring portion 7. For reasons of clarity, only a few of the blades 9 are provided with the corresponding reference numerals in the figures. In the present example, the base ring portion 6, the outer ring portion 7 and the blading 8 are made of plastic or a metallic material.The base ring portion 6, the outer ring portion 7, and the blades 8 together form an integral or monolithic component manufactured by plastic injection molding or plastic transfer molding. If the fan ring disc 1 is made of metallic material, it can be designed as a deep-drawn part.

[0028] From Fig. 1 and Fig. 2, it can also be seen that the fan ring disk 1 has through-openings 10, of which, for reasons of clarity, only a few are provided with the corresponding reference numerals in the figures. The respective through-opening 10 is radially delimited by the base ring portion 6 and the outer ring portion 7. Along the circumferential direction, the respective through-opening 10 is delimited by two of the blades 9 that are directly adjacent to each other along the circumferential direction.

[0029] A main direction of rotation 11 is specified for the fan disk 1, which, in conjunction with the shape and orientation of the blades 9, determines which of the end faces 12, 13 of the fan disk 1 forms the pressure side 4 or the suction side 5. The fan disk 1 has a groove arrangement 14, which in the present example has both end-face grooves 15 and circumferential grooves 16. For reasons of clarity, only a few of the grooves 15, 16 are provided with the corresponding reference numerals in the figures.

[0030] The respective end-face groove 15 is formed - see Fig. 2 - on the end face 13 of the fan ring disk 1, defined as the suction side 5, and extends radially outward from the base ring portion 6. The respective end-face groove 15 is straight in this example. The respective circumferential groove 16 is arranged on an outer circumferential surface 17 of the outer ring portion 7 and runs obliquely with respect to a longitudinal center axis 18 of the fan ring disk 1. Furthermore, the respective circumferential groove 16 is straight according to the present example. In addition, it is provided that the circumferential grooves 16 are arranged on the outer circumferential surface 17 with a left-hand pitch (like teeth of a left-hand externally toothed spur gear). Furthermore, according to the presently described example, it is provided that the groove arrangement 14 on the suction side 5 or the end face 13 has an annular groove 19, by means of which the end-face grooves 15 are fluidly connected to one another.In other words, the annular groove 19 intersects each of the end grooves 15 once, whereby the annular groove 19 is circular and endless.

[0031] None of the grooves 15, 16, 19 opens / ends in one of the through-openings 10. Instead, the grooves 15, 16, 19 and the material-free areas of the through-openings 10 are separated from one another by corresponding groove walls of the grooves 15, 16, 19, so that a fluid, in particular a coolant, in particular gear oil, cannot flow directly from the groove 15, 16, 19 into one of the through-openings 10. It can also be seen from Fig. 1 and Fig. 2 that, in the present example, the end-face grooves 15 and the blades 9 are arranged obliquely with respect to a radius 20 of the fan ring disk 1. In this example, the blades 9 and the end-face grooves 15 are inclined backward with respect to the main direction of rotation. Fig. 3 shows a perspective detailed view of the geometry of the fan ring disc 1 , whereby the arrangement, orientation and shape of the blades 9, the through openings 10 and the grooves 15, 16, 19 can be seen particularly well.

[0032] Fig. 4 shows a perspective view of the rotor 2 of the electric machine 3, wherein it can be seen that in the rotor 2 the fan ring disk 1 and a rotor shaft 21 of the rotor 2 are coupled to one another in a rotationally fixed manner. It can be seen in Figs. 1 to 4 that the fan ring disk 1 in this case has a balancing disk 22, wherein the balancing disk 22 and the base ring portion 6 are connected to one another in a rotationally fixed manner, wherein the balancing disk 22 and the base ring portion 6 are arranged coaxially to one another. In the present case, the base ring portion 6 is injection-molded directly onto an outer peripheral surface 23 of the balancing disk 22, whereby the base ring portion 6 and the balancing disk 22 are connected to one another in a materially bonded manner. Furthermore, it can be provided that the base ring portion 6 is pressed onto the outer peripheral surface 23 of the balancing disk 22.Another possibility for coupling the base ring portion 6, the outer ring portion 7, and / or the blading 8 in a rotationally fixed manner to the rotor shaft 21 is to mold the base ring portion 6, the outer ring portion 7, and / or the blading 8 directly onto the end face of a rotor laminated core of the rotor 2, in particular using a transfer molding or injection molding process. If the fan ring disk 1 is formed from the metallic material, further / different types of fastening or connection between the fan ring disk 1 and the balancing disk 22 are possible. For example, it is conceivable to screw, rivet, etc., the fan ring disk 1 and the balancing disk 22 together. Regardless of the material of the fan ring disk 1, adhesive bonding represents another alternative or supplementary fastening method.Since the balancing disk 22 and the rotor shaft 21 are connected to one another in a rotationally fixed manner, the ring portions 6, 7 and the blading 8 are indirectly connected to the rotor shaft 21 in a rotationally fixed manner by means of the balancing disk 22. According to Fig. 4, the rotor 2 has a rotor lamination stack 24, which forms end faces 25, 26 of the rotor 2. It can be seen that the pressure side 4 or end face 12 of the fan ring disk 1 and the end face 25 of the rotor 2 face one another. Although not shown in the figures, the rotor 2 can have a further fan ring disk 1 on its further end face 26, wherein the pressure side 4 or the suction side 5 of the further fan ring disk 1 can face the end face 26 of the rotor 2. Fig. 5 shows a perspective and partially sectioned view of a portion of the electric machine 3, whose rotor 2 is equipped with the fan ring disk 1. Furthermore, Fig.5 partially shows a stator 27 of the electrical machine 3, in which stator teeth 28 carry wire windings 29. An annular air gap 30, across which the stator 27 and the rotor 2 are radially spaced from one another, can be seen particularly well in Fig. 5. Arrow 31 schematically indicates an air flow which, during operation of the electrical machine 3, i.e. when the rotor 2 is rotated in the main direction of rotation 11, is sucked in by means of the rotating fan disk 1 from its suction side 5. The sucked-in air flows through the through-openings 10 and is then guided into the annular air gap 30 by means of the blading 8 or the blades 9. The air thus passes over the stator teeth 28 and the outer circumferential surface 33 of the rotor laminated core 24.In this way, during operation of the electric machine 3, both the rotor 2 and the stator 27 are efficiently cooled by means of the air flow, wherein any substances that may have entered the annular air gap 30, in particular coolant or oil, are blown out of the annular air gap 30 by means of the air flow. For example, the electric machine 3 can be designed as a wet-running machine, so that during its operation, coolant that would undesirably result in increased friction between the rotor 2 and the stator 27 in the annular air gap 30 is blown out of the annular air gap 30. To promote the introduction or blowing of air into the annular air gap 30, it is further provided in the present example that an outer diameter of the fan annular disk 1 is larger than an inner diameter of the stator 27.

[0033] The fan ring disk 1, the rotor 2, the electric machine 3 and the motor vehicle each demonstrate a possibility of how the cooling of active parts of electric machines can be improved. The core idea here is that air is blown into the air ring gap 30 between the rotor 2 and the stator 27 through the fan ring disk 1, in particular its blades 8. This ensures particularly efficient surface cooling of the rotor 2 and the stator 27, especially in critical areas. In addition, the air flow used for cooling in the air ring gap 30 is used to generate an axial flow in the air ring gap, by means of which the air ring gap 30 is flushed and any oil that may have entered the air ring gap 30 is removed. This ensures particularly efficient operation of the electric machine 3.Since the friction losses caused by any oil in the air gap would generate heat, and these friction losses are prevented by means of the fan ring disc 1, the fan ring disc 1 can be considered as a cooling element that creates a supplementary cooling effect.

[0034] List of reference symbols

[0035] 1 fan ring disc

[0036] 2 rotors

[0037] 3 electric machine

[0038] 4 printed pages

[0039] 5 Suction side

[0040] 6 Base ring portion

[0041] 7 Outer ring portion

[0042] 8 Blading

[0043] 9 Blading

[0044] 10 passage opening

[0045] 11 Main direction of rotation

[0046] 12 Front side of the fan ring disc

[0047] 13 Front side of the fan ring disc

[0048] 14 Groove arrangement

[0049] 15 front groove

[0050] 16 circumferential groove

[0051] 17 Outer peripheral surface

[0052] 18 Longitudinal center axis

[0053] 19 Ring groove

[0054] 20 radius

[0055] 21 Rotor shaft

[0056] 22 balancing disc

[0057] 23 Outer peripheral surface of the balancing disc

[0058] 24 rotor lamination pack

[0059] 25 Front side of the rotor

[0060] 26 Front side of the rotor

[0061] 27 Stator

[0062] 28 stator teeth

[0063] 29 Wire winding

[0064] 30 air ring gap

[0065] 31 Arrow

[0066] 33 Outer peripheral surface of the laminated core

Claims

Patent claims 1. Fan ring disc (1) for a rotor (2) of an electrical machine (3), with - a blading arrangement (8), the blades (9) of which project radially outwards from a base ring portion (6) of the fan ring disc (1) and are connected to one another radially outwards by means of an outer ring portion (7) of the fan ring disc (1), - through openings (10) which are each delimited radially by the base ring portion (6) and the outer ring portion (7) and along the circumferential direction by two of the blades (9) which are directly adjacent to one another along the circumferential direction, - a groove arrangement (14) which - on an end face (12) of the fan ring disc (1) defined as the suction side (4) in relation to a predetermined main direction of rotation (11) of the fan ring disc (1), has end-face grooves (15) which extend radially outwards from the base ring portion (6), and / or - has circumferential grooves (16) on an outer circumferential surface (17) of the outer ring portion (7) which extend obliquely to a longitudinal center axis (18) of the fan ring disc (1).

2. Fan ring disc (1) according to claim 1, characterized in that the groove arrangement (14) has an annular groove (19) on the end face (12) defined as the suction side (4), which intersects and connects the end face grooves (15).

3. Fan ring disc (1) according to claim 1 or 2, characterized in that - the end-face grooves (15) and / or the blades (9) are arranged obliquely with respect to a radius (20) of the fan ring disc (1), in particular are inclined backwards with respect to the main direction of rotation (11), and / or - the circumferential grooves (16) are arranged in a left-hand direction.

4. Fan ring disc (1) according to one of the preceding claims, characterized in that the base ring portion (6), the outer ring portion (7) and / or the blading (8) are made entirely or partially of plastic.

5. Fan ring disc (1) according to one of the preceding claims, characterized by a balancing disc (22) for a rotor shaft (21) of an electrical machine (3), wherein the balancing disc (22) and the base ring portion (6) are connected to one another in a rotationally fixed and axially fixed manner coaxially.

6. Fan ring disc (1) according to claim 5, characterized in that the base ring portion (6) is injection-molded onto an outer peripheral surface (23) of the balancing disc (22) or pressed onto the outer peripheral surface (23) of the balancing disc (22).

7. Rotor (2) for an electrical machine (3) with a rotor shaft (21) on which a fan ring disc (1) designed according to one of the preceding claims is seated in a rotationally fixed manner.

8. Electrical machine (3) with a rotor (2) designed according to claim 7.

9. Electrical machine (3) according to claim 8, characterized in that an outer diameter of the fan ring disc (1) is equal to or greater than an inner diameter of a stator (27) of the electrical machine (3).

10. Motor vehicle with an electrical machine (3) designed according to claim 8 or 9.

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