Electric machine

Abstract

Electric machine (1) which has: a stator (2) comprising a first stator body (21) with a first stator winding (41), a first hydraulic chamber (51) within which the first stator winding (41) is arranged and can be contacted at least partially by a hydraulic fluid (5), a rotor (3) rotatably mounted relative to the stator (2), which has a rotor shaft (30) with at least one rotor body (31) arranged on the rotor shaft (30) in a manner that prevents rotation and displacement, wherein at least one electrical conductor (11) of the first stator winding (41) exits the first stator body (21) in an axial direction and passes through a partition (12), and in the partition (12) a feedthrough element (13) is arranged which is penetrated by the at least one electrical conductor (11) in such a way that a hydraulic barrier (14) is formed between the hydraulic fluid (5) on the side of the partition (12) facing the first stator body (21) and the hydraulic fluid (5) on the side of the partition (12) facing away from the first stator body (21), characterized by the fact that the partition (12) forms a bottom of a conductor channel (16) in which the at least one electrical conductor (11) is guided in the circumferential direction and is overflowed by the hydraulic fluid (5).

Description

[0001] The present invention relates to an electrical machine according to the preamble of claim 1.

[0002] Electric motors are increasingly being used for propulsion in motor vehicles to create alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday usability of electric drives and to offer users the familiar driving comfort.

[0003] A detailed description of an electric drive system can be found in an article in the journal ATZ, Volume 113, 05 / 2011, pages 360-365, by Erik Schneider, Frank Fickl, Bernd Cebulski, and Jens Liebold, entitled: "Highly Integrated and Flexible Electric Drive Unit for E-Vehicles." This article describes a drive unit for one axle of a vehicle, comprising an electric motor arranged concentrically and coaxially to a bevel gear differential. A switchable two-speed planetary gear set is located in the powertrain between the electric motor and the bevel gear differential, also positioned coaxially to the electric motor and the bevel or spur gear differential. The drive unit has a very compact design and, thanks to the switchable two-speed planetary gear set, allows for a good compromise between climbing ability, acceleration, and energy consumption.Such drive units are also referred to as e-axles or electrically operated drive trains.

[0004] In addition to purely electric powertrains, hybrid powertrains are also known. Such powertrains in hybrid vehicles typically combine an internal combustion engine and an electric motor, enabling purely electric operation—for example, in urban areas—while simultaneously providing sufficient range and availability, especially for long-distance journeys. Furthermore, it is possible to use both the internal combustion engine and the electric motor simultaneously in certain operating situations.

[0005] In the development of electric motors intended for e-axles or hybrid modules, there is a continuing need to increase their power densities, making the cooling of these electric motors increasingly important. Due to the required cooling capacity, hydraulic fluids, such as cooling oils, have become the standard in most designs for dissipating heat from the thermally stressed areas of an electric motor.

[0006] Shell cooling and end-winding cooling are known from the prior art for cooling electric machines using hydraulic fluids. While shell cooling transfers the heat generated at the outer surface of the stator lamination stack into a cooling circuit, end-winding cooling transfers the heat directly to the fluid at the conductors outside the stator lamination stack in the area of ​​the winding ends.

[0007] Further improvements are provided by separately designed cooling channels, which are incorporated both into the stator's laminated core (see e.g. EP3157138 A1) and into the slot in addition to the conductors (see e.g. Markus Schiefer: Indirect winding cooling of highly utilized permanent excitation synchronous machines with tooth coil winding, Dissertation, Karlsruhe Institute of Technology (KIT), 2017).

[0008] Concepts are also known in which the windings are directly surrounded by hydraulic fluid to increase power density. Improved cooling with direct contact between hydraulic fluid and the conductor in the slot is already known in principle from the prior art. For example, DE102015013018 A1 describes a solution for electric machines with single-tooth windings, where the fluid flows directly around the windings that are wound around the teeth.

[0009] For defined coolant flow in such electrical machines, it may be necessary to separate the electrical conductor of a winding and the coolant flow so that no relevant cross-flow or pressure loss exists or is caused across the separation.

[0010] From WO 2019 / 241765 A1, an electrical machine according to the preamble of claim 1 is known.

[0011] Regarding further state of the art, reference is made to DE 10 2019 107 516 A1 and DE 10 2019 126 499 A1.

[0012] The object of the invention is to provide an electric machine that exhibits high power density through optimized cooling and electromagnetic design, as well as reliable electrical and hydraulic control. Furthermore, the invention aims to ensure that the electric machine is cost-effective to manufacture and easy to assemble.

[0013] This problem is solved by an electric machine comprising a rotor rotatably mounted relative to a stator, wherein the rotor has a rotor shaft with at least one rotor body arranged on the rotor shaft in a rotationally and laterally fixed manner, wherein the stator has a stator body with a first stator winding, wherein the first stator winding is arranged within a first hydraulic chamber, within which the first stator winding can be contacted at least partially by a hydraulic fluid, wherein at least one electrical conductor of the first stator winding emerges axially from the first stator body and passes through a partition, wherein a feedthrough element is arranged in the partition through which the at least one electrical conductor passes.that a hydraulic barrier is formed between the hydraulic fluid on the side of the partition facing the stator body and the hydraulic fluid on the side of the partition facing away from the stator body.

[0014] According to the invention, the partition wall forms the bottom of a conductor channel in which the conductors are guided in the circumferential direction and are overflowed by the hydraulic fluid.

[0015] Preferably, the hydraulic fluid has a first temperature level T1 on the side of the partition facing the stator body and a second temperature level T2 on the side of the partition facing away from the stator body, wherein preferably the first temperature level T1 is different from the second temperature level T2.

[0016] The feedthrough element thus ensures, in particular, that when the electrical conductor and hydraulic fluid are guided separately, an electrical conductor is positioned within it, the requirements for electrical insulation with regard to air and creepage distances are met, and at the same time the remaining flow cross-section is restricted or sealed in such a way that a hydraulic barrier is formed which allows a cross-flow or current or pressure drop between the electrical conductor and the feedthrough element, as required or permitted for the application, to pass or occur.

[0017] The feedthrough element is thus designed for the uninterrupted local intake and guidance of at least one electrical conductor and for the local narrowing of the flow cross-section of the cooling circuit to form a hydraulic barrier. The feedthrough element can accommodate single conductors or multiple electrical conductors individually or collectively.

[0018] The bushing element blocks the flow cross-section, forming a hydraulic barrier. This hydraulic barrier can be completely sealed or allow a crossflow of hydraulic fluid through it, as required for the application. Preferably, the crossflow can be blocked to such an extent that it results in only a negligible pressure drop in the hydraulic system. The crossflow can be controlled, for example, by a defined circumferential gap between the bushing element and each electrical conductor, by means of compression between the sealing element and the conductor, or by additional sealing elements and sealant. The sealing element can be made of a material suitable for the application, such as an elastomer, engineering plastic, or engineering ceramic.Furthermore, the material can preferably be used to ensure that the air and creepage distances are increased or maintained. The additional sealing agents or sealing elements can be used to reduce or eliminate the sealing effect and thus the cross-flow through the feedthrough element.

[0019] First, the individual elements of the claimed invention are explained in the order in which they are mentioned in the claim set, and subsequently, particularly preferred embodiments of the invention are described.

[0020] Electrical machines are used to convert electrical energy into mechanical energy and / or vice versa, and generally comprise a stationary part called the stator, armature, or rotor, and a part called the rotor or runner that is movably arranged relative to the stationary part. In the case of rotary electrical machines, a distinction is made in particular between radial flux machines and axial flux machines. A radial flux machine is characterized by the fact that the magnetic field lines in the air gap between the rotor and stator extend in a radial direction, while in the case of an axial flux machine, the magnetic field lines in the air gap between the rotor and stator extend in an axial direction. The electrical machine according to the invention can be designed as an axial flux machine or a radial flux machine.

[0021] The stator of an electric machine can be designed, in particular, as a stator for a radial flux machine. The stator of a radial flux machine is typically cylindrical and preferably consists of electrically insulated and stacked electrical steel sheets arranged in layers and bundled into laminated cores. Slots and / or channels, arranged parallel to the rotor shaft, can be cut into the electrical steel sheet around its circumference to accommodate the stator winding or parts thereof. The stator designed for a radial flux machine can be configured as an internal or external rotor stator. For example, in an internal rotor, the stator teeth extend radially inwards, while in an external rotor, they extend radially outwards.

[0022] The electric machine according to the invention is intended in particular for use within the powertrain of a hybrid or fully electric motor vehicle. In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km / h, preferably greater than 80 km / h, and especially greater than 100 km / h, can be achieved. The electric machine preferably has a power output greater than 30 kW, preferably greater than 50 kW, and especially greater than 70 kW. It is further preferred that the electric machine provides rotational speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, and most preferably greater than 12,500 rpm.

[0023] A stator winding is an electrically conductive conductor whose length is significantly greater than its perpendicular length. The stator winding can, in principle, have any cross-sectional shape. Rectangular cross-sectional shapes are preferred because they allow for high packing and, consequently, high power densities. A stator winding made of copper is particularly preferred. A stator winding preferably has insulation. For insulation, mica paper, which may be reinforced with a glass fiber backing for mechanical reasons, can be wound in tape form around one or more stator windings and impregnated with a curing resin. It is also possible, in principle, to use a curable polymer or a lacquer coating without mica paper to insulate a stator winding.

[0024] According to an advantageous embodiment of the invention, the electric machine can be designed as an axial flux machine, comprising the rotor rotatably mounted in a dry chamber relative to the stator, wherein the rotor has the rotor shaft with at least the first disk-shaped rotor body, which is arranged on the rotor shaft in a rotationally and laterally fixed manner, wherein the stator comprises the first annular disk-shaped stator body and the second annular disk-shaped stator body, which are arranged coaxially to each other and to the rotor shaft and axially spaced apart from each other by means of the rotor. The advantage of this embodiment is that the electric machine can thus be designed to be very compact axially.

[0025] The magnetic flux in such an electric axial flux machine (AFM), such as an electric drive motor of a motor vehicle designed as an axial flux machine, is directed axially in the air gap between the stator and rotor to a direction of rotation of the rotor of the axial flux machine. Different types of axial flux machines exist. One known type is a so-called I-arrangement, in which the rotor is arranged axially next to a stator or between two stators. Another known type is a so-called H-arrangement, in which two rotors are arranged on opposite axial sides of a stator. In connection with the present invention, an I-arrangement is preferred.

[0026] It is further preferred that the winding ends of the axial flux machine are oriented such that, in assembly, they are parallel or approximately parallel to the main axis of the machine. During assembly, the winding ends are preferably guided to one of the end faces of the axial flux machine through designated and appropriately designed local cutouts and, after the corresponding machine parts have been axially pushed together, are suitably connected electrically and mechanically. The stator winding ends thus connected are, in a particularly preferred manner, led via connecting conductors to the axially positioned phase terminals at their end faces. These connecting conductors can be seamlessly connected to the winding via winding ends or be suitably electrically and mechanically connected to the winding. The star point or...The star points of the machine are preferably not extended to the phase connection.

[0027] The electric machine can preferably also include a hydraulic connecting element that hydraulically connects the first hydraulic chamber to the second hydraulic chamber, wherein at least one electrical conductor of the first stator winding and / or the second stator winding is arranged within the hydraulic connecting element. The hydraulic connecting element can have any closed cross-sectional geometry and can, for example, be designed as a tube or a hose to bridge one or more interfaces between a first hydraulic chamber of a first stator body and a second hydraulic chamber of a second stator body. This hydraulic connecting element further ensures that the electrical conductor of a stator winding is guided within it and simultaneously surrounded by the coolant.By selecting a suitable material for the hydraulic connecting element and an appropriate wall thickness, electrical insulation can be achieved simultaneously with respect to electrically conductive housing components. The hydraulic connecting element can preferably be inserted or placed into existing openings. Furthermore, the hydraulic connecting element can be used to adjust air and creepage distances within the electric machine.

[0028] The sealing effect of the hydraulic connecting element to adjacent housing parts can be achieved, for example, by a defined gap between the sealing element and the housing, by pressing the hydraulic connecting element against adjacent housing parts in the sealing area, or by using a separate sealing element or sealant. The sealing element can preferably also be integrated into the hydraulic connecting element to create a sealed and electrically insulated feedthrough.

[0029] According to an advantageous embodiment of the invention, it can be provided that the first hydraulic chamber is at least partially enclosed by a limiting first housing component, which has a plurality of circumferentially distributed openings for the passage of the second winding ends.

[0030] According to a further preferred embodiment of the invention, it can also be provided that the first winding ends are arranged on a circular path with a first diameter and the second winding ends are arranged on a circular path with a second diameter, wherein the first diameter differs from the second diameter. This prevents the winding ends from unintentionally contacting each other.

[0031] Furthermore, according to another advantageous embodiment of the invention, the first winding ends and the second winding ends can be oriented towards the same axial end face of the axial flux machine. According to a further particularly preferred embodiment of the invention, the first winding ends and the second winding ends can be connected at the same axial end face of the axial flux machine, thereby further reducing the assembly effort.

[0032] Furthermore, the invention can also be further developed in such a way that the first stator winding and the second stator winding are each configured with at least three phases and a star point connection.

[0033] To provide electrical contact between a wet and a dry area of ​​the electrical machine, at least one electrical connection element can preferably be provided. For this purpose, the electrical connection element has a contacting body which is fixed in a receiving sleeve by means of an interference fit. It can be provided, in particular, that a bolt pressed into the receiving sleeve or a threaded bushing is used as the contacting body, the main function of which is to support the clamping forces, for example, via the load-bearing cross-section and an undercut. The material of the bolt or threaded bushing advantageously has a higher mechanical strength (yield strength) than the material of the receiving sleeve. The receiving sleeve, in turn, preferably has a higher specific electrical conductivity compared to the contacting body.For this reason, the material of the receiving sleeve is softer and therefore has a lower mechanical strength (yield point) than the material of the contacting body.

[0034] The contacting element, designed as a bolt or threaded bushing, is preferably pressed into the housing component in such a way that the softer material is elastically and plastically deformed, so that the sealing effect is sufficient to seal the two spaces on either side of the housing component against each other or against one space against the environment. For this purpose, a cross-sectional expansion is preferably provided on the contacting element, for example, on the bolt or threaded bushing, which is designed for the deformation of the softer material. The elastic component of the deformation ensures the maintenance of the contact pressure, and the plastic component of the deformation extends the sealing distances in the designated area. Excess material from the mating part is absorbed in a designated area. Simultaneously, the cross-sectional expansion of the contacting element, for example, the bolt or threaded bushing, creates aThe threaded bushing features an undercut that counteracts the pull-out of the receiving sleeve. The space for accommodating excess material during the pressing-in process can also be preferably filled with additional sealants or sealing elements, thus further increasing the sealing effect.

[0035] The receiving sleeve with the pressed-in contact element, for example, the bolt or threaded bushing, is preferably mounted in the housing component with electrical insulation. For this purpose, the housing component can, for example, either be made of a poorly conductive material or an insulating material, or be inserted into an electrically non-conductive adapter that provides the electrical insulation between the housing component and the assembly of contact element and receiving sleeve. The sealing effect can be achieved, for example, by sealing elements between the receiving sleeve and the adjacent housing component or adapter.

[0036] According to an advantageous embodiment of the invention, it can be provided that a plurality of electrical conductors pass through the feedthrough element.

[0037] According to a further preferred embodiment of the invention, the hydraulic barrier can also be designed as a seal. Furthermore, according to another advantageous embodiment of the invention, the hydraulic barrier can be designed as a throttle, which has a gap with the electrical conductor, so that a predefined crossflow of hydraulic fluid can be set.

[0038] According to a further particularly preferred embodiment of the invention, it can be provided that a hydraulic barrier is provided in the feedthrough element for each electrical conductor, thereby further optimizing the sealing effect.

[0039] Furthermore, the invention can also be further developed in such a way that the feedthrough element is made of a plastic, in particular an elastomer.

[0040] In a preferred embodiment of the invention, the feedthrough element can also be held in the partition by means of an interference fit. Alternatively or additionally, the feedthrough element can be provided with a positive locking element which, in conjunction with a corresponding positive locking element on the partition, provides a positive locking fixation of the feedthrough element to the partition. The positive locking elements can, for example, form a snap connection, a snap-lock connection, or the like. For this purpose, the feedthrough element can, for example, have an undercut which, in conjunction with a corresponding partition, creates a positive locking connection. In principle, it would also be conceivable in this context that the feedthrough element is arranged with some play in the partition.

[0041] It may also be advantageous to further develop the invention in such a way that the feedthrough element is designed in a plug-like manner, with a circumferential collar which rests against the partition wall, so that a defined position of the feedthrough element relative to the partition wall can be defined.

[0042] Finally, the invention can also advantageously be implemented in such a way that the electric machine is designed as an axial flux machine, with the rotor rotatably mounted in a dry chamber relative to the stator, wherein the rotor has the rotor shaft with at least one first disk-shaped rotor body arranged on the rotor shaft in a rotationally and slidably fixed manner, and the stator comprises a first annular disk-shaped stator body and a second annular disk-shaped stator body, which are arranged coaxially to each other and to the rotor shaft and are axially spaced apart from each other by means of the rotor, and the first stator body has a first stator winding and the second stator body has a second stator winding, wherein the first stator winding is arranged within a first hydraulic chamber and the second stator winding is arranged within a second hydraulic chamber.within which the respective stator windings can each be contacted by a hydraulic fluid, at least section by section.

[0043] The invention will now be explained in more detail with reference to figures, without limiting the general concept of the invention.

[0044] They show: Fig. 1. An electric axial flux machine in a schematic axial section view, Fig. 2 a detailed view of the feedthrough element in a schematic sectional view, Fig. 3 an electric axial flux machine in a perspective exploded view, Fig. 4 a frontal view of an end face of a stator body, and Fig. 5. A motor vehicle with an electric machine in schematic block diagrams.

[0045] The Fig. Figure 1 shows an electric axial flux machine 1 for an electrically driven drive train 10 of a motor vehicle 11, as exemplified in the Fig. 3 is shown. In the upper illustration of the Fig. 3 shows the powertrain 10 of a hybrid-powered vehicle and, in the lower illustration, of a fully electric-powered vehicle 11, each with an electric machine 1.

[0046] The electric machine 1 comprises a rotor 3 rotatably mounted relative to a stator 2, the rotor 3 having a rotor shaft 30 with at least one rotor body 31 arranged on the rotor shaft 30 so as to be fixed against rotation and displacement. The stator 2 has a stator body 21 with a first stator winding 41, the first stator winding 41 being arranged within a first hydraulic chamber 51, within which the first stator winding 41 is at least partially contactable by a hydraulic fluid 5.

[0047] In the illustrated embodiment, the electric machine is designed as an axial flux machine 1, with the rotor 2 rotatably mounted in a dry chamber 32 relative to the stator 3, wherein the rotor 3 has the rotor shaft 30 with at least one first disk-shaped rotor body 31 arranged on the rotor shaft 30 in a rotationally and slidably fixed manner, and the stator 2 comprises a first annular disk-shaped stator body 21 and a second annular disk-shaped stator body 22, which are arranged coaxially to each other and to the rotor shaft 30 and are axially spaced apart from each other by means of the rotor 3.

[0048] The first stator body 21 has a first stator winding 41 and the second stator body 22 has a second stator winding 42, wherein the first stator winding 41 is arranged within a first hydraulic chamber 51 and the second stator winding 42 is arranged within a second hydraulic chamber 52, within which the respective stator windings 41, 42 can each be contacted at least sectionally by a hydraulic fluid 5.

[0049] The first stator winding 41 has first winding ends 43 emerging from the first stator body 21, which extend radially above the stator body 21 in an axial direction. The second stator winding 42 has second winding ends 44 emerging from the second stator body 22, which extend radially above the first stator body 21 and the second stator body 22 in an axial direction. From the overall view of Fig. 1 with the Fig. 2 it is further evident that the first hydraulic chamber 51 is at least partially enclosed by a limiting first housing component 91, which has a plurality of circumferentially distributed openings 13,14 for the passage of the second winding ends 44.

[0050] The first winding ends 43 are arranged on a circular path with a first diameter and the second winding ends 44 are arranged on a circular path with a second diameter, wherein the first diameter is different from the second diameter.

[0051] The first winding ends 43 and the second winding ends 44 are oriented towards the same axial end face of the axial flux machine 1 and are connected at the same axial end face of the axial flux machine 1. The first stator winding 41 and the second stator winding 42 are each configured with at least three phases and a star point connection.

[0052] The electric machine 1 further comprises a plurality of hydraulic connecting elements 6, which hydraulically connect the first hydraulic chamber 51 to the second hydraulic chamber 52. Within each of the hydraulic connecting elements 6, at least one electrical conductor 7 of the second stator winding 42 is arranged. The plurality of essentially identical hydraulic connecting elements 6 are arranged circumferentially distributed between the first hydraulic chamber 51 and the second hydraulic chamber 52.

[0053] The hydraulic connecting element 6 is made of an electrically non-conductive material and has a substantially cylindrical ring-like shape. In the illustrated embodiment, the hydraulic connecting elements 6 are positioned radially above the first stator body 21 and the second stator body 22.

[0054] In the Fig. Figure 1 further shows that each hydraulic connecting element 6 has a first seal 81 that seals the first hydraulic chamber 51 against the dry chamber 32 of the rotor 2, and the hydraulic connecting element 6 has a second seal 82 that seals the second hydraulic chamber 52 against the dry chamber 32 of the rotor 2. In the illustrated embodiment, the first seal 81 and the second seal 82 are designed as sealing rings.

[0055] The hydraulic connecting elements 6 are each connected by means of a press fit to a first housing component 91 which at least partially delimits the first hydraulic chamber 51 and to a second housing component 92 which at least partially delimits the second hydraulic chamber 52.

[0056] An electrical connection element 70 is arranged in the first housing component 91. The electrical contacting element 70 has an electrical contacting body 71 that extends through the housing component 91 such that a first cylindrical section 72 of the contacting body 71 projects into the first hydraulic chamber 51, and a second cylindrical section 77 of the contacting body 71 can be contacted from the side of the first housing component 91 facing away from the first hydraulic chamber 51. The contacting body 71 is fixed in a receiving sleeve 73 by means of a fully enclosed press fit, which in turn is received in the first housing component 91 by means of a press fit. The first section 72 of the contacting body 71 is designed as a bolt, in particular a threaded bolt. Alternatively, it would also be possible for the first section 72 of the contacting body 71 to be designed as a bushing, in particular a threaded bushing.The contacting body 71 runs parallel to the axis of rotation of the rotor 30 in its longitudinal extent.

[0057] The electrical connection element 70 is connected in the direction of the first or second hydraulic chamber 51, 52 to one or more of the electrical conductors 7 of the stator windings 41, 42. In particular, electrical conductors 7 of the same phase can be connected to an electrical connection element 70. This is shown in the Fig. This is the case in the embodiment shown in Figure 1. The first winding ends 43 of the first stator winding 41 and the second winding ends 42 of the second stator winding 42, which are assigned to the same phase, are electrically and mechanically connected to the contacting body 71 of the electrical connection element 70. The connection of an electrical conductor to the first section 72 of the contacting body 71 can be effected, for example, by soldering or welding, or also by means of a detachable connection such as a clamp.

[0058] As from the Fig. As can be seen in Figure 2, at least one electrical conductor 11 of the first stator winding 41 extends axially from the first stator body 21 and passes through a partition 12, wherein on the side of the partition 12 facing the stator body 21 the hydraulic fluid 5 has a first temperature level T1 and on the side of the partition 12 facing away from the stator body 21 the hydraulic fluid 5 has a second temperature level T2. Preferably the first temperature level T1 is different from the second temperature level T2.

[0059] A feedthrough element 13 is arranged in the partition 12, through which the electrical conductor 11 passes in such a way that a hydraulic barrier 14 is formed between the hydraulic fluid 5 on the side of the partition 12 facing the stator body 21 and the hydraulic fluid 5 on the side of the partition 12 facing away from the stator body 21. In the Fig. In the embodiment shown in Figure 2, the hydraulic barrier 14 is designed as a seal that makes contact with the electrical conductor 11. The feedthrough element 13 is made of a plastic, in particular an elastomer, and is held in the partition 12 by means of an interference fit. The feedthrough element 13 is plug-shaped with a circumferential collar 15, which rests against the partition 12.

[0060] As from the Fig. As can be seen in Figure 4, the partition wall 12 forms the bottom of a conductor channel 16 in which the conductors 11 are guided circumferentially and are overflowed by the hydraulic fluid 5.

[0061] The invention is not limited to the embodiments illustrated in the figures. The foregoing description is therefore not to be considered limiting, but rather explanatory. The following claims are to be understood as meaning that a named feature is present in at least one embodiment of the invention. This does not preclude the presence of further features. Insofar as the claims and the foregoing description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing any hierarchy. Reference symbol list 1 machine 2 Stator 3 Rotor 4 Stator winding 5 Hydraulic fluid 6 Connecting element 7 ladders 9 Motor vehicle 10 Powertrain 11 leaders 12 Partition wall 13 Implementation element 14 Barrier 15 collars 16 conductor channel 21 Stator bodies 22 Stator bodies 30 Rotor shaft 31 rotor bodies 32 Drying room 41 Stator winding 42 Stator winding 43 winding ends 44 winding ends 51 Hydraulic room 52 Hydraulic room 70 Connection element 71 Contact bodies Section 72 73 Mounting sleeve 81 Seal 82 Seal 91 Housing component 92 Housing component

Claims

[1] Electric machine (1) comprising: a stator (2) comprising a first stator body (21) with a first stator winding (41), a first hydraulic chamber (51) within which the first stator winding (41) is arranged and can be contacted at least partially by a hydraulic fluid (5), a rotor (3) rotatably mounted relative to the stator (2), which has a rotor shaft (30) with at least one rotor body (31) arranged on the rotor shaft (30) in a manner that prevents rotation and displacement, wherein at least one electrical conductor (11) of the first stator winding (41) exits the first stator body (21) in an axial direction and passes through a partition (12), and in the partition (12) a feedthrough element (13) is arranged which is penetrated by the at least one electrical conductor (11) in such a way that a hydraulic barrier (14) is formed between the hydraulic fluid (5) on the side of the partition (12) facing the first stator body (21) and the hydraulic fluid (5) on the side of the partition (12) facing away from the first stator body (21), characterized by , that the partition (12) forms a bottom of a conductor channel (16) in which the at least one electrical conductor (11) is guided in the circumferential direction and is overflowed by the hydraulic fluid (5). [2] Electric machine (1) according to claim 1, characterized by , that a plurality of electrical conductors (11) pass through the feedthrough element (13). [3] Electric machine (1) according to claim 1 or 2, characterized by, that for each electrical conductor (11) a hydraulic barrier (14) is provided in the feedthrough element (13). [4] Electric machine (1) according to any one of claims 1 to 3, characterized by , that the hydraulic barrier (14) is designed as a seal. [5] Electric machine (1) according to any one of claims 1 to 4, characterized by , that the hydraulic barrier (14) is designed as a throttle which has a gap with the electrical conductor (11). [6] Electric machine (1) according to any one of claims 1 to 5, characterized by , that the feedthrough element (13) is formed from a plastic, in particular an elastomer. [7] Electric machine (1) according to any one of claims 1 to 6, characterized by , that the feedthrough element (13) is held in the partition wall by means of an interference fit (12) and / or by means of a positive locking. [8] Electric machine (1) according to any one of claims 1 to 7, characterized by, that the feedthrough element (13) is designed in a plug-like manner with a circumferential collar (15) abutting the partition wall (12). [9] Electric machine (1) according to any one of claims 1 to 8, characterized by , that the electric machine is designed as an axial flux machine (1), the rotor (3) is rotatably mounted in a dry room (32) relative to the stator (2), which at least one rotor body (31) is designed in a disc shape, the first stator body (21) is annular disk-shaped, the stator (2) has a second annular disk-shaped stator body (22), the first stator body (21) and the second stator body (22) are arranged coaxially to each other and to the rotor shaft (30) and are spaced axially apart from each other by means of the rotor (3) in between, the second stator body (22) has a second stator winding (42), and the second stator winding (42) is arranged within a second hydraulic chamber (52) and is at least partially contactable by the hydraulic fluid (5).

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