Stator for an electric motor, electric motor and electric drive system

Abstract

A stator (14) for an electric motor is described. The stator (14) comprises a stator core (16) with several slots for receiving windings (18) of stator coils. The stator (14) further comprises an electrically conductive shielding arrangement. The electrically conductive shielding arrangement is designed to shield the stator core from capacitive coupling with the windings (18). The electrically conductive shielding arrangement is electrically insulated from the stator (14). The electrically conductive shielding arrangement comprises at least one connector section that can be electrically connected to a reference potential. Furthermore, an electric motor (12) and an electric drive system (10) are described.

Description

[0001] The invention relates generally to a stator for an electric motor. The invention further relates to an electric motor and an electric drive system.

[0002] In the prior art, it is known to provide electromagnetic shielding means to avoid unwanted couplings within an electric motor, for example, a shield that reduces capacitive coupling of the stator to a radially inner area of ​​the stator, such as to the rotor.

[0003] However, other undesirable capacitive couplings can occur in the electric motor. For example, capacitive coupling of the stator coils with the stator core can lead to common-mode alternating currents that are fed back to the primary power supply.

[0004] These alternating currents can cause electromagnetic interference. Therefore, it is desirable to provide an optimized path for the alternating currents back to the primary power supply.

[0005] It is known to direct the interference currents (i.e., the common-mode alternating currents) back to an EMC filter via a first ground potential assigned to the stator core, specifically through capacitors of the EMC filter that are connected to a second ground potential assigned to the primary power supply.

[0006] Since these capacitors have a limited capacitance due to safety regulations, this type of wiring has proven to be less than ideal. In fact, components of the EMC filter can heat up considerably due to interference currents, necessitating appropriate countermeasures regarding thermal energy.

[0007] The invention is based on the objective of providing a stator for an electric motor, an electric motor and an electric drive system that enable optimized conduction of interference currents.

[0008] According to the invention, the problem is solved by a stator for an electric motor. The stator comprises a stator core with several slots for receiving stator coil windings. The stator further comprises an electrically conductive shielding arrangement. The electrically conductive shielding arrangement is designed to shield the stator core from capacitive coupling with the windings. The electrically conductive shielding arrangement is electrically insulated from the stator. The electrically conductive shielding arrangement comprises at least one connector section that can be electrically connected to a reference potential.

[0009] The stator according to the invention is based on the idea of ​​providing an additional shield, namely the electrically conductive shielding arrangement, which prevents capacitive coupling of the windings with the stator core and collects the corresponding interference currents.

[0010] The reference potential differs from a local ground potential associated with the stator core, i.e., it differs from the electrical potential of the stator core. The stator core can, for example, be grounded to the chassis of an electric vehicle or to the housing of an electric machine containing the stator. Accordingly, in these examples, the reference potential differs from the electrical potential of the electric vehicle chassis or the electrical potential of the housing.

[0011] Since the electrically conductive shielding arrangement is electrically isolated from the stator core, the interference currents are not discharged via the ground potential associated with the stator core. For example, the interference currents are not discharged via the stator core and the chassis. Instead, the interference currents collected by the electrically conductive shielding arrangement can be discharged to the reference potential via at least one connector section.

[0012] The interference currents are therefore not discharged via the capacitors of an EMC filter, resulting in a significantly lower thermal load on the EMC filter.

[0013] On the one hand, the reduced thermal stress increases the service life of the EMC filter components.

[0014] On the other hand, the reduced thermal load lowers the thermal management requirements, allowing for the use of more cost-effective thermal management solutions for the EMC filter. In fact, some components of the EMC filter may no longer be necessary, making more cost-effective EMC filters possible.

[0015] The stator typically comprises three stator coils. However, it is understood that any other suitable number of stator coils can be provided.

[0016] According to one aspect of the present invention, the shielding arrangement comprises at least one end-winding shielding element, wherein the at least one end-winding shielding element is electrically conductive, wherein the at least one end-winding shielding element is electrically insulated from the stator core, and wherein the at least one end-winding shielding element is connected to or comprises the at least one connector section. Generally, the at least one end-winding shielding element is arranged axially adjacent to the stator core. The at least one end-winding shielding element is designed to shield the stator core and / or a radially inner region of the stator from capacitive coupling with the end windings of the stator coils. The corresponding interference currents can be discharged to the reference potential via the at least one connector section, i.e., these interference currents do not load the EMC filter, as described above.

[0017] In particular, the shielding arrangement can comprise a first end-winding shielding element arranged axially adjacent to the stator core on a first front face of the stator core, and a second end-winding shielding element arranged axially adjacent to the stator core on a second front face of the stator core, opposite the first front face. At least one of the end-winding shielding elements can be connected or connectable to the reference potential. The end-winding shielding elements can be interconnected via other components of the electrically conductive shielding arrangement, e.g., via the slot shielding elements described below.

[0018] One aspect of the present invention provides that the shielding arrangement comprises several slot shielding elements, wherein the slot shielding elements are arranged between the windings of the stator coil and the stator core, wherein each slot shielding element comprises an electrically conductive layer, wherein the electrically conductive layer is electrically insulated from both the windings and the stator core, and wherein the electrically conductive layer is connected to or comprises the at least one connector section. The electrically conductive layer prevents capacitive coupling of the respective windings with the stator core, since the electrically conductive layer is arranged between the windings and the stator core. Furthermore, the electrically conductive layer collects the corresponding interference currents, which can then be discharged to the reference potential via the at least one connector section.

[0019] The slot shielding elements cover at least the area between the windings and the stator. Optionally, the slot shielding elements can also cover the slots towards the rotor. Shielding of the end windings is also possible.

[0020] The slot shielding elements can be insulated from the stator core, the windings, and the rotor.

[0021] The slot shielding elements can be connected to each other at least at one end of the slot shielding elements, namely axially outside the stator core.

[0022] In one embodiment of the present invention, the slot shielding elements each comprise at least one electrically insulating layer that electrically isolates the electrically conductive layer from the stator core. Accordingly, the at least one electrically insulating layer prevents the interference currents collected by the electrically conductive layer from being discharged via the stator core, i.e., via ground potential.

[0023] The at least one electrically insulating layer, which isolates the electrically conductive layer from the stator core, can be arranged between the electrically conductive layer and the stator core.

[0024] In a further embodiment of the present invention, the at least one electrically insulating layer consists of or comprises aramid paper. Aramid paper provides reliable electrical insulation for the electrically conductive layer.

[0025] In fact, the slot shielding elements can each have a multi-layered structure. For example, the slot shielding elements can each comprise a first electrically insulating layer, wherein a substrate layer is provided on the first electrically insulating layer, wherein the electrically conductive layer is provided on and / or within the substrate layer, and a second electrically insulating layer is provided on the electrically conductive layer.

[0026] Adhesive layers can be provided between the individual layers of the slot shielding elements.

[0027] For example, the substrate layer could be a PET film.

[0028] The electrically conductive layer can be designed as a structured metallization applied to the substrate layer.

[0029] Accordingly, the substrate layer, especially the PET film, can support the structured metallization.

[0030] The electrically conductive layer can be sandwiched between at least one electrically insulating layer and at least one further electrically insulating layer, at least in the area where the slot shielding elements contact the stator core. The at least one further electrically insulating layer provides additional electrical insulation of the electrically conductive layer from the windings. This ensures that the electrically conductive layer is electrically insulated from both the stator core and the windings.

[0031] According to one aspect of the present invention, the slot shielding elements each comprise a contact window, wherein the contact window is arranged in a region of the respective slot shielding element that lies axially outside the respective slot, and wherein the electrically conductive layer is exposed in the contact window. Accordingly, the contact window enables contact with the electrically conductive layer in order to discharge the interference currents collected by the electrically conductive layer. Thus, the at least one connector section can be connected to the electrically conductive layer through the contact window.

[0032] In one embodiment of the present invention, the electrically conductive layer is arranged at least in a radially outer region of the respective slot. More precisely, the electrically conductive layer can cover at least a section of the walls of the respective slot facing the windings, so that the stator core is effectively shielded from capacitive coupling with the windings.

[0033] In fact, the electrically conductive layer can be located in an area of ​​the respective groove that is facing away from an opening of the respective groove.

[0034] According to a further embodiment of the present invention, the electrically conductive layer consists of or comprises an electrically conductive film and / or an electrically conductive tape. This enables a particularly simple and cost-effective manufacture of the electrically conductive shielding arrangement, or more precisely, the slot shielding elements.

[0035] For example, the electrically conductive layer can consist of or comprise an electrically conductive tape, such as Contafel H0865 or any other suitable type of electrically conductive tape.

[0036] As another example, the electrically conductive layer can consist of or comprise a metallized polymer film, such as a metallized PET film.

[0037] According to one aspect of the present invention, the electrically conductive layers of the slot shielding elements are all connected to a common electrical conductor. Accordingly, the interference currents collected by the electrically conductive layers of the slot shielding elements can be discharged via the common electrical conductor.

[0038] In fact, the common electrical conductor can be connected to the at least one connector section, or the at least one connector section can be connected to it.

[0039] According to another aspect of the present invention, the electrically conductive layers of the slot shielding elements can be electrically connected to the at least one end-winding shielding element. Accordingly, the interference currents collected by the electrically conductive layers and by the at least one end-winding shielding element can be discharged together via the at least one connector section.

[0040] For example, spring contacts can be provided between the electrically conductive layers and the at least one end-winding shielding element. The spring contacts ensure a reliable electrical connection between the electrically conductive layer and the at least one end-winding shielding element.

[0041] As another example, the electrically conductive layers and the at least one end winding shielding element can be electrically connected to each other by an adhesive metal tape, in particular by an adhesive copper tape, or by an adhesive metal braid, in particular an adhesive copper braid.

[0042] According to the invention, the problem is further solved by an electric motor. The electric motor comprises a stator according to one of the variants described above.

[0043] Regarding the advantages and other properties of the electric motor, reference is made to the explanations given above for the stator, which also apply to the electric motor and vice versa.

[0044] According to the invention, the problem is further solved by an electric drive system. The electric drive system comprises an electric motor as described above. The electric drive system further comprises a high-voltage direct current (HVDC) system, wherein the at least one connector section is electrically connected to an HVDC potential of the HVDC system.

[0045] The interference currents can be safely discharged to the HVDC potential without the need for additional thermal management, as the interference currents can be directed to the HVDC potential with comparatively low resistance.

[0046] Regarding the advantages and other properties of the electric drive system, reference is made to the above-mentioned explanations on the stator and electric motor, which also apply to the electric drive system and vice versa.

[0047] The electric drive system can further include a frequency converter, wherein at least one connector section upstream of the frequency converter is electrically connected to the HVDC potential. As described above, the interference currents can be routed to the HVDC potential without requiring additional thermal management.

[0048] In one embodiment of the present invention, the electrical drive system further comprises an EMC filter (electromagnetic compatibility filter), wherein the at least one connector section downstream of the EMC filter is electrically connected to the HVDC potential. As already described above, capacitors of the EMC filter that are connected to a ground potential are not subjected to interference currents by the interference current routing provided according to the invention.

[0049] This allows for the use of more cost-effective thermal management solutions for the EMC filter, and increases the service life of the EMC filter components.

[0050] The foregoing aspects and many of the associated advantages of the claimed subject matter will become more apparent when a better understanding is gained by means of the following detailed description in conjunction with the accompanying drawings. - Fig. Figure 1 schematically shows an electric drive system according to the present invention; - Fig. Figure 2 schematically shows a section of a stator of the electric drive system. Fig. 1 in more detail; - Fig. Figure 3 schematically shows a cross-section of a slot shielding element of the electric drive system. Fig. 1; - Fig. Figure 4 shows a perspective view of a section of the stator. Fig. 1; and - Fig. 5 shows the section of the stator made of Fig. 4 with an end winding shielding element attached to it.

[0051] The detailed description set forth below, in conjunction with the accompanying drawings in which identical numbers refer to identical elements, is intended to describe various embodiments of the disclosed subject matter and is not meant to represent the only embodiments. Each embodiment described in this disclosure is provided merely as an example or illustration and should not be construed as preferable or advantageous over other embodiments. The illustrative examples given herein are not intended to be exhaustive or to limit the claimed subject matter to the exact forms disclosed.

[0052] For the purposes of this disclosure, the expression “at least one of A, B and C” means, for example, (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C), including all other possible permutations when more than three elements are listed. In other words, the expression “at least one of A and B” generally means “A and / or B”, namely “A” alone, “B” alone, or “A and B”.

[0053] Fig. Figure 1 schematically shows an electric drive system 10 for an electrically powered vehicle, such as an electrically powered passenger car or an electrically powered truck.

[0054] The electric drive system 10 includes an electric motor 12.

[0055] The electric motor 12 has a stator 14 with a stator core 16 which accommodates several windings 18 of stator coils.

[0056] Typically, the stator 16 can comprise three stator coils. However, depending on the application, any other suitable number of stator coils can be provided.

[0057] Of course, the electric motor 12 also includes a rotor, which is in Fig. 1 is not explicitly shown.

[0058] In general, the electric motor 12 can be designed as any type of electric motor with a stator coil.

[0059] At the in Fig. In the embodiment shown in Figure 1, the electric drive system 10 further comprises a high-voltage (HV) direct current (DC) system 19 with an HV battery 20 designed to supply a DC voltage for the electric motor 12.

[0060] Furthermore, the HVDC system 19 includes an EMC filter 22 connected to the HV battery 20, as well as a frequency converter 24 connected to the EMC filter 22.

[0061] More precisely, the frequency converter 24 is connected between the EMC filter 22 and the electric motor 12.

[0062] In general, the EMC filter 22 is designed to prevent unwanted propagation of common-mode and / or differential-mode electromagnetic energy, such as interference caused by pulse-width modulation switching noise.

[0063] As in Fig. As illustrated in Figure 1, the EMC filter 22 typically includes capacitors 26 connected to a ground potential 28 associated with the EMC filter 22, which may be an electrical potential of a chassis of the electrically powered vehicle.

[0064] It should be noted that the EMC filter may include 22 additional components, such as inductors, which are located in Fig. 1 are not shown to avoid visual clutter.

[0065] The frequency converter 24 is designed to convert the DC voltage provided by the HV battery 20 into a corresponding AC voltage for the electric motor 12.

[0066] The HV battery 20, the EMC filter 22 and the frequency converter 24 can be manufactured according to any suitable variant known in the prior art, apart from the differences described below.

[0067] In a known prior art design, interference currents induced by capacitive coupling of the windings 18 with the stator core 16 are discharged back to the HV battery 20 via a ground potential 29 associated with the stator core 29 and the ground potential 28 associated with the EMC filter 22. These interference currents are common-mode alternating currents.

[0068] The ground potentials 28, 29 can each correspond to a local potential of the chassis, i.e., the ground potentials 28, 29 can each be connected to the chassis.

[0069] More precisely, in the state of the art, the interference currents are discharged to the HV battery 20 via the ground potentials 28, 29 and via the capacitors 26 of the EMC filter 22.

[0070] In contrast, according to the in Fig. In the embodiment of the electric drive system 10 shown in Figure 1, the disturbance currents are directed via an electrical conductor 30, which is neither part of the stator core 16 nor part of the chassis, to a reference potential that differs from the ground potential.

[0071] This connection is achieved by capacitive coupling of an additional shielding arrangement with the windings 18, which are located in Fig. 1 is illustrated as equivalent capacities C1 to C3.

[0072] At the in Fig. In the embodiment shown in Figure 1, the reference potential is a negative HVDC potential 32 of the HVDC system 19.

[0073] The electrical conductor 30 between the EMC filter 22 and the frequency converter 24 is connected to the reference potential, in particular to the negative HVDC potential 32.

[0074] However, it is understood that the reference potential can also be a positive HVDC potential 34 of the HVDC system 19. In fact, the electrical conductor 30 can be connected to the positive HVDC potential 34 and the negative HVDC potential 32 using two additional capacitors, with a capacitor in between each.

[0075] Fig. Figure 2 schematically shows a section of the stator core 16 with a slot 36 in more detail.

[0076] As usual, the windings 18 of the stator coil are provided in the slot 36.

[0077] However, a slot shielding element 38 is provided between the windings 18 and the stator core 16, which is part of the shielding arrangement.

[0078] The slot shielding element 38 is arranged at least in a radially outer area of ​​the slot 36, specifically at least between the windings 18 and a radially outer wall 40 of the slot 36.

[0079] However, as in Fig. As illustrated in Figure 2, the slot shielding element 38 can also extend between the windings 18 and side walls 42 of the slot 36.

[0080] In fact, the slot shielding element 38 can also cover an opening of the slot 36, i.e. a radially inner area of ​​the slot 36, thus preventing coupling of the windings 18 with the rotor.

[0081] The slot shielding element 38 includes a connector section 44 which can be connected to or is connected to the electrical conductor 30.

[0082] In general, the slot shielding element 38 is designed to shield the stator core 16 from capacitive coupling with the windings 18. If the slot shielding element 38 also covers an opening of the slot 36, the rotor is also shielded from capacitive coupling with the windings 18.

[0083] Accordingly, it is desirable that the groove shielding element 38 covers as large an area of ​​the groove 36 as possible.

[0084] Furthermore, the slot shielding element 38 is designed to collect interference currents resulting from capacitive coupling with the windings 18 and to discharge these interference currents via the connector section 44 to the electrical conductor 30 and thus to the reference potential.

[0085] Furthermore, the slot shielding element 38 is designed to electrically insulate the windings 18 from the stator core 16.

[0086] A slot shielding element 38, as in Fig. As shown in Figure 2, it can be provided in each slot of the stator core 16, so that capacitive coupling of the windings 18 with the stator core 16 is effectively prevented.

[0087] Fig. Figure 3 shows an embodiment of the slot shielding element 38 in more detail.

[0088] In this embodiment, the slot shielding element 38 comprises a first electrically insulating layer 46, an electrically conductive layer 48 and a second electrically insulating layer 50.

[0089] The first electrically insulating layer 46 comprises a first aramid paper layer 52 and a second aramid paper layer 54, wherein a substrate layer 56 is arranged between the aramid paper layers 52, 54.

[0090] The aramid paper layers 52, 54 and the substrate layer 56 can be attached to each other by adhesive layers 58.

[0091] It goes without saying that any other suitable type of insulating material can be used instead of aramid paper.

[0092] The substrate layer 56 can, for example, be designed as a PET film or as any other suitable type of flexible, non-conductive film.

[0093] The second electrically insulating layer 50 can be designed analogously to the first electrically insulating layer 46.

[0094] It is understood that, although the first electrically insulating layer 46 and the second electrically insulating layer 50 are described above with several sublayers each, it is also conceivable that the electrically insulating layers 46, 50 can both or individually be replaced by single layers of electrically insulating material.

[0095] The electrically conductive layer 48 can, for example, be designed as an electrically conductive tape, such as Contafel H0865 or as any other suitable type of electrically conductive tape.

[0096] As another example, the electrically conductive layer 48 can have a substrate layer with a metal applied to the substrate layer.

[0097] In other words, the electrically conductive layer 48 can be or comprise a metallized polymer film, such as a metallized PET film.

[0098] For example, the metal can be applied to the polymer film by vapor deposition.

[0099] As in Fig. As illustrated in Figure 2, the slot shielding elements 38 are inserted into the slots 36 and can cover all areas of the slots 36 facing the windings 18.

[0100] Accordingly, the electrically conductive layer 48 is arranged between the windings 18 and the stator core 16, so that the electrically conductive layer 48 prevents capacitive coupling of the windings with the stator core 16.

[0101] Furthermore, the electrically conductive layer 48 collects the corresponding interference currents, which are then discharged via the connector section 44.

[0102] In fact, each slot shielding element 38 can include a contact window, wherein the contact window is arranged in a region of the respective slot shielding element 38 that lies axially outside the respective slot 36.

[0103] The electrically conductive layer 48 can be connected to the respective connector section 44, which connects the electrically conductive layer 48 to the electrical conductor 30 through the contact window.

[0104] The electrically conductive layer 48 is electrically insulated from both the stator core 16 and the windings by the first electrically insulating layer 46 and the second electrically insulating layer 50, respectively.

[0105] Thus, the accumulated interference currents cannot discharge via the stator core 16.

[0106] As in Fig. As illustrated in Figure 4, the shielding arrangement can further include slot insulation 60 covering the openings of the slots 36.

[0107] The slot insulations 60 can be part of the respective slot shielding element 38, i.e. the slot insulations 60 can be formed integrally with the respective slot shielding element 38.

[0108] However, it is also conceivable that the slot insulations 60 can be formed separately from the slot shielding elements 38, but have the same structure as the slot shielding element 38, in particular the one in Fig. The structure shown in section 3 can be observed.

[0109] In this case, the slot insulations 60 can also be connected to the electrical conductor 30, so that disturbance currents collected by the slot insulations 60 can be discharged to the reference potential.

[0110] Alternatively, the slot insulation 60 and the slot shielding elements 38 can be formed in one piece.

[0111] In this case, the slot shielding elements 38 can encompass the slot insulations 60, i.e., the slot shielding elements 38 can completely enclose the respective windings 18. This avoids capacitive coupling with the rotor.

[0112] As in Fig. As illustrated in Figure 5, the shielding arrangement can comprise at least one end winding shielding element 62 which is arranged axially adjacent to the stator core 16.

[0113] The at least one end winding shielding element 62 is electrically conductive, but electrically insulated from the stator core 16.

[0114] In fact, at least one end winding shielding element 62 can be electrically connected to the electrically conductive layers 48 of the slot shielding elements 38 and thus also to the electrical conductor 30.

[0115] At the in Fig. In the embodiment shown in Figure 5, the at least one end winding shielding element 62 comprises teeth 64 which contact the slot shielding elements 38 which are provided in the slots 36, or more precisely the electrically conductive layers 48 of the slot shielding elements 38.

[0116] For example, spring contacts can be provided between the electrically conductive layers 48 and the at least one end winding shielding element 62.

[0117] As a further example, the electrically conductive layers 48 and the at least one end winding shielding element 62 can be electrically connected to each other by an adhesive metal tape, in particular by an adhesive copper tape, or by an adhesive metal braid, in particular an adhesive copper braid.

[0118] Accordingly, both disturbance currents collected by the at least one end winding shielding element 62 due to capacitive coupling with end windings of the windings 18, and disturbance currents collected by the slot shielding elements 38, can be discharged together via the electrical conductor 30 to the reference potential.

[0119] Although only a single end winding shielding element 62 is described above, it is understood that the shielding arrangement may comprise a first end winding shielding element arranged axially adjacent to the stator core 16 on a first front face of the stator core 16, and a second end winding shielding element arranged axially adjacent to the stator core 16 on a second front face of the stator core 16, which is opposite the first front face.

[0120] While the electrically conductive shielding arrangement described above is in connection with an electric motor 12 of a vehicle, it is further understood that the teachings and explanations set out above also apply to other electric motors or electrical machines, for example, industrial electric motors.

[0121] In this case, the reference potential to which the interference currents are directed can be chosen differently depending on the specific application.

[0122] The present application may refer to quantities and numbers. Unless expressly stated otherwise, such quantities and numbers are not to be considered limiting, but rather as examples of the possible quantities or numbers in connection with the present application. In this context, the term "several" may also be used in the present application to refer to a quantity or number. In this respect, the term "several" shall mean any number greater than one, for example, two, three, four, five, etc. The terms "approximately," "about," "nearly," etc., mean plus or minus 5% of the stated value.

Claims

[1] Stator for an electric motor (12), wherein the stator (14) comprises a stator core (16) with several slots (36) that accommodate windings (18) of stator coils, wherein the stator (14) further comprises an electrically conductive shielding arrangement, wherein the electrically conductive shielding arrangement is designed to shield the stator core (16) from capacitive coupling with the windings (18), wherein the electrically conductive shielding arrangement is electrically isolated from the stator (14) and wherein the electrically conductive shielding arrangement comprises at least one connector section (44) which can be electrically connected to a reference potential. [2] Stator according to claim 1, wherein the shielding arrangement comprises at least one end winding shielding element (62), wherein the at least one end winding shielding element (62) is electrically conductive, wherein the at least one end winding shielding element (62) is electrically insulated from the stator core (16) and wherein the at least one end winding shielding element (62) is connected to or comprises the at least one connector section (44). [3] Stator according to one of the preceding claims, wherein the shielding arrangement comprises several slot shielding elements (38), wherein the slot shielding elements (38) are arranged between the windings (18) of the stator coil and the stator core (16), wherein the slot shielding elements (38) each comprise an electrically conductive layer (48), wherein the electrically conductive layer (48) is electrically insulated from both the windings (18) and the stator core (16), and wherein the electrically conductive layer (48) is connected to or comprises the at least one connector section (44). [4] Stator according to claim 3, wherein the slot shielding elements (38) each comprise at least one electrically insulating layer (46) which electrically insulates the electrically conductive layer (48) from the stator core (16). [5] Stator according to claim 4, wherein the at least one electrically insulating layer (46) consists of or comprises aramid paper. [6] Stator according to claim 4 or 5, wherein the electrically conductive layer (48) is arranged in a sandwich-like manner between the at least one electrically insulating layer (46) and at least one further electrically insulating layer (48) at least in a region where the slot shielding elements (38) contact the stator core (16). [7] Stator according to one of claims 3 to 6, wherein the slot shielding elements (38) each comprise a contact window, wherein the contact window is arranged in a region of the respective slot shielding element (38) which is axially outside the respective slot (36), and wherein the electrically conductive layer (48) is exposed in the contact window. [8] Stator according to one of claims 3 to 7, wherein the electrically conductive layer (48) is arranged at least in a radially outer region of the respective slot (36). [9] Stator according to any one of claims 3 to 8, wherein the electrically conductive layer (48) consists of or comprises an electrically conductive film and / or an electrically conductive strip. [10] Stator according to any one of claims 3 to 9, wherein the electrically conductive layers (48) of the slot shielding elements (38) are all connected to a common electrical conductor (30). [11] Stator according to claim 2 in combination with one of claims 3 to 10, wherein the electrically conductive layers (48) of the slot shielding elements (38) are electrically connected to the at least one end winding shielding element (62). [12] Electric motor comprising a stator (14) according to any of the preceding claims. [13] Electric drive system, wherein the electric drive system (10) comprises an electric motor (12) according to claim 12, wherein the electric drive system (10) further comprises a high-voltage direct current, HVDC, system (19), wherein the at least one connector section (44) is electrically connected to an HVDC potential (32; 34) of the HVDC system (19). [14] Electric drive system according to claim 13, further comprising a frequency converter (24), wherein the at least one connector section (44) upstream of the frequency converter (24) is electrically connected to the HVDC potential (32; 34). [15] Electric drive system according to claim 13 or 14, further comprising a filter (22) for electromagnetic compatibility (EMC), wherein the at least one connector section (44) downstream of the EMC filter (22) is electrically connected to the HVDC potential (32; 34).

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