Motors and motor vehicles

Abstract

The invention relates to an electric motor (10) and a motor vehicle equipped with the electric motor. The electric motor (10) comprises a stator, a rotor and a slip ring module (12) connected to the motor shaft of the electric motor (10). At least one wire guide channel (18, 38) extends in the slip ring module (12), through which contact wires (26, 40) for electrically connecting the rotor winding to the slip ring (24) are guided accordingly. A first section (20) of the wire guide channel (18, 38) extends from the slip ring (24) in an axial direction parallel to the motor shaft. A second section (22) of the wire guide channel (18, 38) then extends radially outwards. An elastic sealing element (42, 54) is arranged in or on the second section (22) and surrounds the corresponding contact wire (26, 40), the sealing element being used to seal the wire guide channel (18, 38) against the ingress of lubricant.

Description

Technical Field

[0001] The invention relates to an electric machine, in particular for a motor vehicle, and to a motor vehicle having such an electric machine. Background Art

[0002] Electric machines have been known for a long time in a variety of variants, but they have always been of particular importance in many technical and industrial fields of application. It is foreseeable that the importance of electric machines will increase in the future, especially in the field of vehicle technology. Against this background, further improvements and optimizations are obviously very desirable.

[0003] The electric motor can often be operated as an electric motor or as a generator. For example, DE102006025394A1 discloses an AC generator to be installed in a vehicle. A slip ring that can rotate with the rotating shaft and a brush that slides on the slip ring and is received in a brush holder are provided. The slip ring and the brush holder are covered by a slip ring cover. The rear cover covering the brush has a first vent, which forms a connection between the internal space of the sliding section containing the brush and the outside of the AC generator. A second vent is further provided, which forms a connection between the internal space containing the brush in the brush holder and the outside of the AC generator. The internal space of the sliding section containing the brush is sealed here by a seal. These seals can be provided, for example, on the axial ends of the brush holder and the slip ring cover and are made of a plate-like rubber material.

[0004] As another application example, an electric rotation and deflection unit with a directly driven brushless motor, for example for an industrial robot, is known from DE 43 14 628 C1. The stator is used here as a basic housing with a stepless deflection angle adjustment, an integrated air passage and an integrated electrical signal and energy passage with a plug connector. There are no hoses and cables outside. The entire unit is sealed against dust and water spray, wherein a modular construction is provided at the same time with simple interchangeability of the rotating disk. A plurality of channels extend through the distributor flange, with which corresponding connecting channels in the rotating distributor can be connected. Sealing devices can be provided on both sides of the corresponding connection between the channel and the connecting channel.

[0005] In another application example, a liquid-cooled electric motor is known from DE112013003975T5. A coolant distribution system is provided here so as to distribute the liquid coolant on a first path and a second path. The first path is guided into the hollow rotor shaft (from which the coolant can flow radially outward through the radial holes in the hollow rotor shaft during operation), and then further longitudinally guided into the rotor coolant channel in the rotor and into the collecting container. The second path is guided radially outward during operation through the inlet radial holes in the coolant inlet connector and then longitudinally guided into the coolant channel at the edge (the coolant channel is arranged in the gap between the housing and the stator of the electric motor), and finally also guided into the collecting container. For multiple internal flow paths, there is no need to provide a liquid-tight sealing device, which can save costs. The only liquid-tight sealing device required is a sealing device connected between the coolant and the external environment. Summary of the invention

[0006] The object of the present invention is to improve the reliability of an electric machine, in particular in wet operation. This object is achieved according to the present invention by an electric machine and a motor vehicle as follows.

[0007] The motor according to the present invention has a stator and a rotor supported in the stator in a manner that can rotate around the central longitudinal axis of the motor shaft of the motor, and a slip ring module connected to the motor shaft, that is, coupled. The slip ring module is here non-rotatable relative to the rotor and rotatable relative to the slip ring of the motor and has at least one wire guide channel, which is used to guide the corresponding contact wires electrically connected to the corresponding rotor winding and the slip ring through the guide channel. The at least one wire guide channel here at least substantially extends from the slip ring to the wire outlet of the slip ring module. Here, the first section of the wire guide channel extends at least substantially or almost from the slip ring in an axial direction parallel to the central longitudinal axis. The second section of the wire guide channel connected to the first section extends radially outward until the wire outlet. That is, the wire outlet is here the radially outer end of the second section of the wire guide channel, that is, finally an opening in the side wall or outer wall of the slip ring module. The wire outlet can also include the area of ​​the slip ring module that directly surrounds the opening.

[0008] In or on the second section of the wire guide channel, an elastic sealing element is provided according to the invention, which surrounds the contact wire guided in the wire guide channel, and the sealing element is used to seal the wire guide channel to prevent lubricant from penetrating into the wire guide channel at the wire outlet. In other words, the sealing element seals the wire guide channel, in particular the second section of the wire guide channel or the wire outlet, relative to the surrounding area of ​​the slip ring module or the motor. As explained in more detail further below, the sealing element can be designed, for example, as a sealing plug introduced into the second section of the wire guide channel, but can also be designed, for example, as an O-ring. Such an O-ring can, for example, be in contact with the wire outlet, that is, in contact with the radially outer end of the second section of the wire guide channel or embedded in the radially outer end region of the second section of the wire guide channel.

[0009] The electric machine according to the invention can preferably be a wet synchronous machine, i.e. a synchronous machine which is operated at least partially under oil, for example a current-excited synchronous machine. In this case, in a manner known in principle, the motor shaft can be connected to the rotor in a rotationally fixed manner or can be driven by the rotor during operation of the electric machine. The slip ring is part of a sliding contact, i.e. forms an electrical connection between a part of the electric machine which is stationary during operation and a part which rotates or turns during operation.

[0010] Advantageously, the present invention can prevent oil, in particular, used as a lubricant, from reaching the sliding contact, that is, the slip ring, by means of a sealing element arranged in or on the line guide channel. Although it is known in principle from known motors that, for example, an outer sealing device is arranged on both sides of the slip ring, for example in the form of a sealing ring surrounding the motor shaft or the slip ring module. However, the present invention is based on the following understanding, that is, the lubricant can, for example, reach the line guide channel or the line outlet through a crack in the rotor filling material. From there, the lubricant can then - especially due to the capillary effect - slowly pass through the line guide channel along the contact line and thus reach the sliding contact or the slip ring. Here, the lubricant can penetrate into the sealing device arranged so far. When the lubricant reaches the sliding contact, the lubricant can, for example, deteriorate the electrical contact, completely or partially interrupt the current flow, cause damage or additional wear and thus ultimately reduce the reliability and service life of the motor. By arranging a sealing element in or on the second section of the current line guide channel, the oil circuit that has not been considered so far can be closed or sealed, thereby avoiding or reducing the mentioned adverse effects.

[0011] The electric machine can have a plurality of wire guide channels distributed in the circumferential direction, and the second section of each wire guide channel can be closed or sealed with its own sealing element. Different windings of the rotor, that is, different poles or pole pairs of the rotor can be contacted and supplied with current for generating a rotor field via different wire guide channels or different contact wires extending in the wire guide channels. However, for reasons of simplicity and clarity, the present invention is explained here essentially with respect to one wire guide channel and, correspondingly, with respect to one sealing element.

[0012] In an advantageous design of the present invention, the wire guide channel is mostly filled with a thermosetting forming material that surrounds the contact wire. That is, the corresponding contact wire is electrically insulated and mechanically fixed by the forming material. The forming material can be sprayed or injected into the wire guide channel, for example, and the contact wire is arranged or maintained in the wire guide channel. Similarly, the forming material can first form the wire guide channel by surrounding the contact wire. In order to manufacture the motor, for example, the contact wire can first be introduced into the corresponding wire guide channel in the axial direction and then staggered outward in the radial direction, so that the curved end of the contact wire protruding radially outward is obtained by the second section of the wire guide channel. The contact wire can then be held or clamped in this position. The sealing element can already be on the curved end of the contact wire or can be pushed onto the contact wire after the contact wire is introduced or positioned. After positioning the contact wire and the sealing element, the forming material can then be sprayed or injected. Once the forming material is then solidified or hardened, the wire guide channel is formed or filled and the contact wire is fixed by the forming material. As further explained in more detail below, the sealing element can also be advantageously held or fixed by the forming material. Although the contact line is directly and non-indirectly embedded in the molding material in this way, a distance can still be present between the contact line and the molding material, for example due to gas inclusions, surface roughness and / or the like. Such a distance can be, for example, a few micrometers, which can be sufficient as a creeping path for the lubricant to propagate along the contact line. It is therefore particularly advantageous to prevent the penetration of lubricants by the sealing element. Due to the elasticity of the sealing element, the sealing element can, for example, lie against the contact line more tightly than is typical for thermosetting molding materials.

[0013] In another advantageous design of the present invention, the sealing element is made of an elastomer, in particular an ethylene-acrylate-elastomer (English: AEM), having an electrical breakdown strength of at least 15 kV / mm. That is, the sealing element is made of a material that is elastic and has a relatively high electrical insulation grade and a relatively high leakage current resistance or a relatively high CTI value (English: Comparative Tracking Index). This can advantageously achieve the desired sealing of the second section or the wire outlet of the wire guide channel on the one hand and improve the electrical insulation of the contact wire or improve the leakage current resistance and breakdown resistance of the motor on the other hand. For example, the leakage current path between the portion of the contact wire that protrudes radially outward from the wire outlet and the outer side or surface of the slip ring module surrounding the wire outlet can be increased by the sealing element.

[0014] In another advantageous design of the present invention, the sealing element is configured as a sealing plug, which is arranged in the second section of the wire guide channel. The sealing plug can partially, but preferably completely, penetrate or pass through the second section of the wire guide channel in the radial direction, that is, perpendicular to the central longitudinal axis or the motor shaft. By designing the sealing element as a sealing plug with a significant radial extension dimension that is introduced into the wire guide channel, it is possible to advantageously achieve a particularly good sealing effect and a particularly reliable installation or retention of the sealing plug in its setting position, that is, in the second section of the wire guide channel. The sealing plug can be introduced into the second section of the wire guide channel from the inside in a direction pointing radially outward or from the outside in a direction pointing radially inward. The former can advantageously achieve a particularly reliable retention or installation of the sealing plug in the second section of the wire guide channel under the effect of centrifugal forces such as those occurring during the operation of the motor, while the latter can advantageously achieve a particularly simple manufacture of the motor.

[0015] In an advantageous further embodiment of the invention, the sealing plug protrudes radially outwards beyond the end of the second section of the wire guide channel formed by the wire outlet. In other words, the sealing plug protrudes outside in the area of ​​the wire outlet beyond the outer wall or surface of the slip ring module. This can advantageously further improve the electrical insulation effect of the sealing plug, because the leakage current path or breakdown path between the part of the contact wire protruding radially outwards from the sealing plug to the surrounding surface of the slip ring module can be further enlarged. In addition, the sealing plug can be advantageously placed on the contact wire over a longer path, thereby achieving an improved or particularly reliable sealing effect. In addition, this design advantageously provides the possibility of widening the area of ​​the sealing plug protruding radially outwards beyond the wire outlet in the axial direction, thereby improving the insulating effect of the sealing plug on the one hand and improving the positioning accuracy or positioning reliability and / or installation or retention of the sealing plug in its setting position on the other hand.

[0016] That is, in an advantageous further embodiment of the present invention, it is provided that the sealing plug has a structure that is at least substantially mushroom-shaped, and the structure has a rod region and a head region that is widened compared to the rod region. The maximum diameter of the head region is greater than the minimum diameter of the second section of the wire guide channel or the diameter of the wire outlet. In other words, the sealing plug is shaped so that the sealing plug can be partially introduced into the wire guide channel with the rod region, and the head region is too wide or too large for this. Therefore, the electrical insulation effect of the sealing plug can be further improved as described if necessary. It is also possible to prevent the sealing plug from being pushed into the second section of the wire guide channel or pushed into the second section of the wire guide channel too far when manufacturing the motor. Instead, it can be provided that the widened head region is abutted against the end of the second section of the wire guide channel or the surface of the wire outlet surrounding the wire. This can be advantageously achieved particularly simply and reliably when manufacturing the motor. The head region can be radially arranged inside or outside according to the design. The diameter of the rod region can correspond to the diameter of the second section of the wire guide channel at least partially or partly, for example, or be larger than the diameter of the second section of the wire guide channel, depending on the elasticity of the sealing plug, so much that the rod region can still be introduced into the second section of the wire guide channel due to its elasticity, i.e. its elastic deformability or compressibility. The latter can advantageously lead to a particularly good sealing effect of the sealing plug.

[0017] In an advantageous further embodiment of the present invention, the sealing plug is fixed or held in the second section of the wire guide channel by a forming material, which covers and fixes the contact wire at least in the first section of the wire guide channel. This can be the thermosetting forming material mentioned in particular. By fixing the sealing plug with a forming material proposed here, it is advantageously possible to prevent, in a particularly simple and low-cost manner, the sealing plug from being pressed out or pulled out from the second section of the wire guide channel, for example, based on the centrifugal force that occurs during the operation of the motor. It is particularly advantageous that no additional fastening elements are required to fix the sealing plug, which advantageously can reduce the complexity of the motor and the manufacturing expenditure and cost. In order to fix the sealing plug, the forming material can, for example, partially encapsulate the sealing plug. The forming material can, for example, according to the design of the sealing plug and / or according to the material selection or material combination, for example, shape locking, material locking and / or force locking to hold or fix the sealing plug.

[0018] In an advantageous further embodiment of the invention, the sealing plug has a constriction with a reduced diameter. In other words, the sealing plug has at least one portion with a diameter that is smaller than the diameter of the region of the sealing plug that is connected to the region on both sides along the longitudinal extension direction of the sealing plug. In particular, the reduced diameter of the constriction can be smaller than the diameter, in particular the minimum diameter, of the second section of the wire guide channel. By means of this design of the sealing plug, the molding material can reach the region of the constriction and surround the region with a correspondingly larger diameter of the sealing plug there at least on one side of the constriction. That is, undercutting or anchoring fixing can be achieved thereby, wherein the molding material holds or fixes the sealing plug in a form-locking manner in the second section of the wire guide channel after it hardens. The sealing plug can thereby be fixed in a particularly simple and reliable manner, thereby advantageously further improving the reliability of the motor without the need to install additional components or assemblies.

[0019] In an advantageous further embodiment of the invention, the widening of the sealing plug, which defines the constriction on the side facing the central longitudinal axis, is partially interrupted along the circumference of the sealing plug. In other words, the widening of the inner side of the sealing plug only partially constitutes the full diameter of the second section of the wire guide channel and has a section or region with a diameter smaller than the diameter of the second section of the wire guide channel. The diameter in these interruptions can at least substantially correspond to the diameter of the constriction or be between the diameter of the constriction and the diameter of the second section of the wire guide channel. By at least one interruption of the widening, a connection or an inlet to the constriction can be advantageously realized or formed. By means of this connection or by means of this inlet, during the manufacture of the electric machine, the molding material surrounding the contact wire, which is still liquid or viscous at this time, can reach radially outwards to the constriction from the inside, that is, from the side facing the central longitudinal axis. As a result, the area of ​​the second section of the wire guide channel that is not occupied by the sealing plug can be filled particularly reliably with molding material, whereby the sealing plug can again be fixed particularly reliably by molding material. In order to achieve as uniform filling as possible of the area or volume of the second section of the wire guide channel not occupied by the sealing plug by the molding material and to fix the sealing plug particularly reliably and evenly by the molding material, the widened portion of the sealing plug can preferably have multiple interruptions arranged in an especially uniformly distributed manner in the circumferential direction.

[0020] Another aspect of the invention is a motor vehicle having at least one electric machine according to the invention. If the electric machine is a drive motor for generating a force or torque for propelling the motor vehicle, the motor vehicle can accordingly be an electric vehicle or a hybrid vehicle.

[0021] Other features of the invention can be derived from the claims, the drawings and the description of the drawings. The features and feature combinations mentioned above in the description and the features and feature combinations shown separately in the following description of the drawings and / or in the drawings can be used not only in the respectively given combination but also in other combinations or alone without leaving the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 A schematic cutaway perspective view showing a portion of an electric machine;

[0024] Figure 2 A schematic perspective view showing a sealing plug for a wire guide channel of an electric machine;

[0025] Figure 3 A partial schematic cross-sectional view showing the area around the sealing plug in an unfilled state;

[0026] Figure 4 a partial schematic cross-sectional view showing the area around the sealing plug in a filled state; and

[0027] Figure 5 A partial schematic sectional view of a region with an alternative sealing element is shown. DETAILED DESCRIPTION

[0028] In the figures, identical elements and elements having the same function are respectively provided with the same reference symbols.

[0029] Figure 1 A schematic perspective cutaway view of a portion of an electric machine 10 is shown. In particular, a portion of a slip ring module 12 is shown here, which is rotatable about a central longitudinal axis 14. The central longitudinal axis 14 here extends centrally in the longitudinal direction through a shaft receiving space 16 surrounded by the slip ring module 12, in which the motor shaft of the electric machine 10 can be arranged. A wire guide channel 18 extends in the slip ring module 12. The wire guide channel 18 has a first section 20 extending in an axial direction parallel to the central longitudinal axis 14 and a second section 22 extending radially through the wall of the slip ring module 12 following the first section. A slip ring 24 is also shown here, which likewise surrounds the shaft receiving space 16. In the wire guide channel 18, a contact wire 26 is currently arranged, which contacts the slip ring 24 electrically and is led out of the second section at its other end through the second section 22 of the wire guide channel 18. In the complete electric machine 10 , the end of the contact wire 26 leading out of the second section can be guided to the rotor winding, ie can be electrically connected to the rotor winding.

[0030] The contact wire 26 has an axial section 28 similar to the wire guide channel 18, which extends in the first section 20 and is therefore also offset radially outwards parallel to the central longitudinal axis 14. Also similar to the wire guide channel 18, a radial section 30 of the contact wire 26 is connected to the axial section 28. The radial section 30 is guided radially outwards through the second section 22. The radially outer end of the second section 22 is referred to here as a wire outlet 32, that is, from which the radial section 30 of the contact wire 26 protrudes from the slip ring module 12.

[0031] In order to better explain the course of the contact wire 26, the wire guide channel 18 is shown here in an empty, ie unfilled state. In another production range of the electric machine 10, the wire guide channel 18 is also locked, ie the area surrounding the contact wire 26 is also filled to electrically insulate and spatially fix the contact wire 26.

[0032] In the axial direction, ie in the direction along the central longitudinal axis 14 , sealing rings are arranged on both sides of the wire outlet opening 32 , namely a first seal 34 on the side facing the slide ring 24 and a second seal 36 on the opposite side of the wire outlet opening 32 .

[0033] In the present case, the electric machine 10 or the slip ring module 12 can have a plurality of wire guide channels 18 with corresponding dedicated contact wires 26 arranged in the wire guide channels. Here, a further wire guide channel 38 is shown by way of example with a further contact wire 40. For these wire guide channels or contact wires and for other wire guide channels or contact wires not shown here, the embodiments and explanations given here for the wire guide channels 18 and the contact wires 26 or for the further wire guide channel 38 and the further contact wire 40 should apply analogously.

[0034] Despite the presence of the seals 34, 36, it has been found that during operation of the electric machine 10, oil can reach the wire outlet 32 ​​and along the contact wire 26 through the wire guide channel 18 as far as the slip ring 24 or the sliding contact formed by the slip ring 24 and the contact wire 26. In order to prevent this, the wire guide channel 18 or its second section 22 is sealed by an additional sealing element, which surrounds the contact wire 26 in the region of the second section 22 or at the wire outlet 32, in order to prevent or reduce the penetration of oil into the wire guide channel 18.

[0035] Such sealing elements are Figure 24 is shown in a schematic perspective view in the form of a sealing plug 42. The sealing plug 42 has a substantially mushroom-shaped basic shape with a widened head region 44 and a narrower shaft region following the head region. A constriction 46 is currently provided on the shaft region. On the side of the constriction 46 opposite the head region 44, the sealing plug 42 has a plurality of widenings 48 arranged evenly distributed in the circumferential direction. These widenings 48 are interrupted in the circumferential direction by interruptions 50 respectively located therebetween. That is, the sealing plug 42 has a smaller diameter in the region of the interruptions 50 than in the region of the widenings 48.

[0036] The sealing plug 42 can be inserted or pushed into the radial section 30 and the second section 22 during the manufacture of the electric machine 10, for example, in the radial direction from the outside to the inside. The lower side of the head region 44 facing the constriction 46 can then be placed on the outer side of the sliding module 12 in the area of ​​the wire outlet 32.

[0037] Likewise, for reasons of clarity, the wire guide channel 18 is also shown here in an unfilled state during the production of the electric machine 10 , ie empty except for the contact wires 26 and the sealing plug 42 .

[0038] Figure 4 In the schematic sectional view, which is also partial, the area around the second section 22 is also shown. However, the wire guide channel 18 is shown here in a filled state. Here, the wire guide channel 18 is filled here by a thermosetting molding material 52. That is, the molding material 52 surrounds the contact wire 26 and at least partially surrounds the sealing plug 42. In particular, the molding material 52 fills the second section 22 of the wire guide channel 18 in the area of ​​the constriction 46 of the embedded sealing plug 42 and thus fixes not only the contact wire 26 but also the sealing plug 42. The shaft receiving space 16 is not filled with the molding material 52, that is, it remains empty in order to accommodate the motor shaft of the electric machine 10, which is not shown here. The shaft receiving space 16 can be separated from the area filled here by the molding material 52, for example. Also during the manufacturing process, a spacer element corresponding to the shaft receiving space 16 in terms of its shape can be introduced into the slip ring module 12, then encapsulated or cast with the molding material 52 and then removed again to release the shaft receiving space 16 after the molding material 52 has at least partially solidified or hardened.

[0039] Figure 5 A schematic partial sectional view of the area around a radial section of a further wire guide channel 38 with an alternatively designed sealing element is shown. The sealing element for sealing the further wire guide channel 38 is designed here as an O-ring 54 surrounding the further contact wire 40. Depending on the application or requirements, preferably all sealing elements in a specific electric machine 10 can be of the same type, that is, as sealing plugs 42 or as O-rings 54.

[0040] Overall, the described example shows how the line outlets of lines for making electrical contacts to the rotor winding or sliding contacts on the slip ring module 12 can be sealed by means of sealing elements, in particular elastomeric sealing plugs with anchoring, in order to improve the oil tightness and thus the reliability, in particular in wet operation of the electric motor 10, i.e. operation with continuous oiling.

[0041] Reference numerals list

[0042] 10 Motor

[0043] 12 Slip Ring Module

[0044] 14Central longitudinal axis

[0045] 16-axis receiving space

[0046] 18-line guide channel

[0047] 20 Section 1

[0048] 22Second Section

[0049] 24 Slip Rings

[0050] 26 contact line

[0051] 28 axial section

[0052] 30 radial segments

[0053] 32-line outlet

[0054] 34 first sealing device

[0055] 36 Second sealing device

[0056] 38 Another line guide channel

[0057] 40 Another contact line

[0058] 42 Sealing plug

[0059] 44Head area

[0060] 46 Contraction

[0061] 48 widening part

[0062] 50 Interruption

[0063] 52 Forming materials

[0064] 54O-ring

Claims

1. An electric machine (10) comprising a stator and a rotor supported in the stator so as to be rotatable about a central longitudinal axis (14) of a motor shaft of the electric machine (10), and a slip ring module (12) connected to the motor shaft, the slip ring module being non-rotatable relative to the rotor and rotatable relative to a slip ring (24) of the electric machine (10) and having a wire guide channel (18, 38) through which a contact wire (26, 40) for electrically connecting a rotor winding to the slip ring (24) is guided from the slip ring to a wire outlet of the slip ring module (12), wherein a first section (20) of the wire guide channel (18, 38) extends from the slip ring (24) in an axial direction parallel to the central longitudinal axis (14), and a second section (22) of the wire guide channel (18, 38) following the first section extends radially outwards to the wire outlet (32), and an elastic sealing element (42, 54) is arranged in or on the second section (22) and surrounds the contact wire (26, 40), which sealing element is used to seal the wire guide channel (18, 38) against the penetration of lubricant at the wire outlet (32), in, The sealing element (42, 54) is designed as a sealing plug (42) arranged in the second section (22) of the wire guide channel (18, 38) and extending completely through the second section of the wire guide channel in a radial direction, ie perpendicularly to the central longitudinal axis.

2. The electric machine (10) according to claim 1, characterized in that The wire guide channel (18, 38) is predominantly filled with a thermosetting forming material (52) surrounding the contact wire (26, 40).

3. The electric machine (10) according to claim 1 or 2, characterized in that The sealing element (42, 54) is manufactured from an elastomer having an electrical breakdown strength of at least 15 kV / mm.

4. The electric machine (10) according to claim 3, characterized in that The sealing element (42, 54) is produced from an ethylene-acrylate elastomer having an electrical breakdown strength of at least 15 kV / mm.

5. The electric machine (10) according to claim 1 or 2, characterized in that The sealing plug (42) protrudes radially outward beyond the end of the second section (22) of the wire guide channel (18, 38) formed by the wire outlet opening (32).

6. The electric machine (10) according to claim 1 or 2, characterized in that The sealing plug (42) has an at least substantially mushroom-shaped structure with a shaft region and a head region (44) widened in comparison with the shaft region, wherein the maximum diameter of the head region (44) is greater than the minimum diameter of the second section (22) of the wire guide channel (18, 38).

7. The electric machine (10) according to claim 1 or 2, characterized in that The sealing plug (42) is fixed in the second section (22) by a molding compound (52) which envelops and fixes the contact wires (26, 40) at least in the first section (20).

8. The electric machine (10) according to claim 7, characterized in that The sealing plug (42) has a constriction (46) having a reduced diameter.

9. The electric machine (10) according to claim 8, characterized in that The widening (48) of the sealing plug (42) which defines the constriction (46) on the side facing the central longitudinal axis (14) is interrupted in places along the circumference of the sealing plug. 10 . A motor vehicle having an electric machine ( 10 ) as claimed in claim 1 .

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