Stator for an electric machine of a motor vehicle and electric machine

Abstract

The invention relates to a stator (1) for an electrical machine (2) of a motor vehicle, comprising a laminated core (3) having at least one slot (4), and comprising at least one winding (9) held on the laminated core (3), which winding is arranged at least in regions in the slot (4), which is at least partially closed at one end in the radial direction (8) of the stator (1) by means of a slot closure element (10), wherein a wall region (11) of the laminated core (3) delimiting the slot (4) is lined at least in the circumferential direction (5) of the stator (1) by means of at least one slot inner lining (12) formed separately from the slot closure element (4), which at least partially delimits at least one cooling channel (13) extending at least in regions within the slot (4) and through which a coolant can flow, by means of which the winding (9) can be cooled,wherein at least one sealing element (14) formed separately from the groove inner lining (12) and the groove closure element (10) is arranged in the groove (4) between the groove inner lining (12) and the groove closure element (10).

Description

The invention relates to a stator for an electric machine of a motor vehicle according to the preamble of claim 1.DE 10 2021 109 441 A1 discloses a stator for an electric machine, comprising a stator body having a plurality of stator teeth arranged in a circumferentially distributed manner and stator grooves formed between the stator teeth and extending through the stator in the axial direction. Stator windings arranged essentially radially one above the other are accommodated in the stator slots, wherein the stator slots have a slot base at their radially outer end and a slot opening at their radially inner end along their radial extent, wherein the slot openings are closed by a slot closure means.It is the object of the invention to provide a stator for an electric machine of a motor vehicle and an electric machine for a motor vehicle, such that the stator can be cooled particularly advantageously.This object is achieved according to the invention by a stator for an electric machine of a motor vehicle having the features of patent claim 1 and by an electric machine for a motor vehicle having the features of patent claim 10. Advantageous embodiments of the invention are the subject matter of the dependent claims and the description.A first aspect of the invention relates to a stator for an electric machine of a motor vehicle or for the motor vehicle. The motor vehicle is designed, for example, as a motor vehicle, in particular as a passenger car, utility vehicle or as a truck. Alternatively, the motor vehicle is designed, for example, as a passenger bus or as a motorcycle, in particular as a motorcycle. Preferably, the motor vehicle, in particular in its completely manufactured state, has the electric machine, and in particular the stator.The motor vehicle can preferably be driven by means of the electric machine, for example purely electrically. The motor vehicle is thus designed, for example, as an electrically drivable motor vehicle. In other words, the motor vehicle is designed, for example, as a battery-electric vehicle or as a hybrid vehicle.The stator is connected, for example, to a housing of the electric machine. The electric machine preferably has a rotor which is rotatable about a machine axis of rotation of the electric machine relative to the stator. By means of the electric machine, an electric power can be converted into a mechanical power, as a result of which the rotor can be driven by the stator and can thereby be rotated or can be rotated about the machine rotation axis relative to the stator. The electrical power can be provided, for example, by an electrical energy store, in particular via an on-board power supply system, of the motor vehicle. The electrical energy store is designed, for example, as a battery or as an accumulator. The electric machine can provide at least one torque via the rotor, in particular for driving the motor vehicle.The stator has at least one laminated core, which can be referred to in particular as a stator lamination or as a stator laminated core. The laminated core can be formed in one piece, in particular in one piece, or in multiple pieces, in particular in multiple pieces. If the laminated core is formed in multiple parts, in particular in multiple pieces, the laminated core has, for example, a plurality of laminated core parts formed separately from one another and in particular connected to one another. The laminated core parts can adjoin one another at least indirectly, in particular directly, in the axial direction of the stator.The laminated core has at least one groove, which can be referred to in particular as a stator groove. In other words, the at least one groove is arranged, in particular provided or formed, on the laminated core. The groove extends, for example, in the axial direction of the stator, in particular within the laminated core, that is to say within a laminated core body of the laminated core. Thus, a first direction of extension of the groove runs, for example, in the axial direction of the stator. A second direction of extension of the groove extends, for example, in the radial direction of the stator.For example, the groove has an opening at one end in the radial direction of the stator, which can be referred to in particular as a groove opening. This means that the groove is open at one end, i.e. open. Preferably, the opening of the groove is adjoined, in particular in the radial direction of the stator, by at least one air gap of the electric machine. The air gap preferably extends, in particular in the radial direction of the stator, between the stator and the rotor.The stator has at least one winding, in particular one directly, held on the laminated core, for example on the laminated core body, which winding can be referred to in particular as a stator winding. The winding comprises, for example, at least one winding, preferably a plurality of windings. The winding is manufactured from copper, for example, as a result of which the winding can be referred to in particular as a copper winding. The winding is formed, for example, from a continuous conductor. The winding or a plurality of windings formed of the continuous conductor may form a coil. Preferably, the stator comprises a plurality of coils. The winding or the coil can form a winding body which is held on the laminated core. The winding body preferably comprises a plurality of windings or coils.The winding is arranged at least in regions, in particular predominantly or completely, in the slot. This means that the winding extends at least in regions within the slot. Thus, the winding is, for example, at least partially guided through the laminated core via the groove.The groove is closed at one end in the radial direction of the stator at least partially, in particular predominantly or completely, by means of at least one groove closure element, in particular formed separately from the laminated core. In other words, the groove, in particular one end, is at least partially covered by the groove closure element in the radial direction of the stator. Thus, for example, the opening of the groove is closed by means of the groove closure element. For example, the slot closure element is arranged, in particular in the radial direction of the stator, between the air gap and at least one receiving region of the slot, wherein the winding is arranged in the receiving region. Thus, the slot closure element extends, for example, in particular in the radial direction of the stator, between the air gap and the winding. The groove closure element can be referred to in particular as a groove closure.In order to be able to cool the stator, in particular the winding, particularly advantageously, in particular particularly intensively, it is provided according to the invention that a wall region of the laminated core, which wall region at least partially, in particular directly, delimits or forms the groove, is at least partially, in particular predominantly or completely, clad or lined, at least in the circumferential direction of the stator by means of at least one groove inner lining formed separately from the groove closure element. In other words, the groove inner lining is arranged, in particular at least in the circumferential direction of the stator, between the wall region of the laminated core and the receiving region or the winding. In other words again, the groove inner lining is arranged, in particular held, in particular directly, on the wall region of the laminated core delimiting the groove. Thus, the receiving region is, for example, at least partially delimited or formed by the groove interior lining. This groove interior lining can be understood in particular as a groove lining element or groove lining element, which can also simply be referred to as a lining part only. The groove interior lining delimits or forms at least partially, in particular predominantly or completely, a cooling channel which extends at least in regions within the groove and through which a coolant can flow. In other words, the cooling channel is arranged at least partially in the groove. In particular, the groove can be flown through by the coolant flowing through the cooling channel. In other words again, the cooling channel, in particular the coolant flowing through the cooling channel, is designed as, in particular direct, groove cooling. By means of the cooling channel, in particular by means of the coolant flowing through the cooling channel, the winding can be cooled, in particular at least indirectly or directly. In other words, heat can be discharged from the winding, in particular for cooling the winding, by means of the cooling channel, in particular by means of the coolant flowing through the cooling channel. The cooling channel or the slot cooling can thus be understood to mean a, in particular direct, winding cooling.The fact that the groove is at least partially delimited by the wall region of the laminated core can be understood in particular to mean that the wall region of the laminated core adjoins the groove, in particular at least in the circumferential direction of the stator, for example directly. The wall region is formed, for example, by the laminated core body.The coolant is, for example, an oil, which can be referred to in particular as cooling oil. The cooling channel, which can be referred to in particular as an oil channel, can thus be flown through by the oil as the coolant, for example.In order to be able to cool the stator particularly advantageously, it is furthermore provided that at least one sealing element which is formed separately from the groove inner liner and the groove closure element and which can be referred to in particular as a sealing compound is arranged in the groove, in particular in the radial direction of the stator, between the groove inner liner and the groove closure element. Thus, the groove or the opening of the groove is, for example, at least partially, in particular predominantly or completely, closed by the sealing element and the groove closure element. In other words, the groove inner lining and / or the winding is supported, in particular directly, on the sealing element in the radial direction of the stator, for example towards the inside, wherein the sealing element is supported on the groove closure element in the radial direction of the stator, for example towards the inside. This means that the groove inner lining and / or the winding is supported on the groove closure element, in particular at least indirectly or directly, by means of the sealing element. In particular, the groove is sealed, i.e. secured, by means of the sealing element with respect to coolant which exits from the groove and in particular enters the air gap. The emerging coolant can be coolant originating from the cooling channel. In other words, the cooling channel is secured or sealed by means of the sealing element with respect to an, in particular undesired, emergence of the coolant from the cooling channel, and in particular from the groove.The invention is based in particular on the following findings and considerations: in stators, for example with an endless shaft winding and copper conductors of the winding fed from the inside into the stator laminated core in the radial direction, the slot, which can also be referred to as a stator slot, can be configured to be disadvantageously large with respect to electromagnetics because of a wire feed into the laminated core, that is to say because of the arrangement of the winding in the slot. In order to be able to obtain the resulting, and in particular particularly large, stator slot gap for cooling, in particular oil cooling, tight again, the slot closure element can be used, which is designed, for example, as a slot part. This can be mounted individually for each slot of the stator, for example.By means of the stator according to the invention, in particular by means of the cooling channel of the stator according to the invention, the, in particular direct, groove cooling can be effected. This is in particular a cooling channel arranged in the groove for the, in particular direct, cooling winding. As a result, a particularly large amount of heat can be dissipated from the winding, as a result of which the winding can be cooled particularly intensively, that is to say particularly well. Thus, for example, the best possible heat dissipation, in particular the best possible cooling of the electric machine, can be effected. When the coolant enters the air gap, efficiency losses of the electric machine can occur. This can be avoided by the sealing element, i.e. by a sealing effect effected by the sealing element. This means that safety against the penetration of the coolant into the air gap can be particularly increased. Thus, by means of the sealing element, in particular in combination with the groove closure element, a sealing of the groove closure can be effected. The groove lining can likewise act as a seal for the cooling channel or for the coolant, in particular when the laminated core is formed in multiple parts, that is to say gaps are provided for example between the individual laminated core parts of the laminated core, which gaps cannot be tight, in particular oil-tight. When mounting the winding, i.e. when arranging the winding in the slot, the slot inner lining can serve as a protection for the winding, in particular as a protection of the conductor of the winding, as a result of which, during mounting, damage to the winding, in particular to the conductor, or insulation arranged on the winding or in the conductor can be avoided, for example. As a result, safety against a short circuit can be particularly increased. In particular, the mounting of the winding can thereby be particularly simplified, as a result of which a production outlay of the stator can be kept particularly low. Overall, it can be seen that by means of the stator according to the invention, a sealing concept of the air gap for the stator, in particular high-performance stator, can be realized with direct slot cooling.In a further embodiment, it is provided that the groove interior trim is formed at least in regions, in particular predominantly or completely, from plastic. In other words, the groove interior trim is designed as a plastic component. As a result, the stator can be produced particularly cost-effectively, as a result of which the production outlay of the stator can be kept particularly low. Furthermore, the cooling channel can be sealed particularly well by means of the groove inner lining. Furthermore, a weight of the stator can be kept particularly low.Alternatively or additionally, it is provided in a further embodiment that the groove inner lining is formed as an insert part which can be inserted or is inserted into the groove for arrangement into its installation position provided in the stator, in particular in the groove. This means that the groove inner lining is already located outside its installation position provided in the stator in its completely produced state, for example, and is thus arranged in the groove or on the wall region of the laminated core after its, in particular complete, production, and is in particular connected to the laminated core. Thus, the groove inner lining or the insert part is preferably not a component injected onto the laminated core or into the groove. This means that the groove interior trim part is not produced or is not produced by injection molding the groove, in particular with plastic. As a result, the manufacturing cost of the stator can be kept particularly low. The injection or injection molding can be understood in particular as an injection protection method, in particular a plastic injection short-circuit method.In a further embodiment, it is provided that the groove inner lining has a wall thickness between 0.1 millimeters and 0.35 millimeters, preferably between 0.2 millimeters and 0.3 millimeters. In other words, the groove inner lining is designed as a thin-walled component, in particular as a thin-walled plastic component or as a thin-walled plastic insert. As a result, the weight of the stator can be kept particularly low. Furthermore, the manufacturing cost of the stator can be kept particularly low. By means of the particularly thin wall thickness, particularly advantageous heat conducting properties and / or heat transfer properties can also be realized, for example.In a further embodiment, it is provided that the sealing element is connected, in particular directly, in a form-fitting manner to the wall region of the laminated core and / or to the groove closure element. In other words, the sealing element is held on the wall region of the laminated core, in particular directly, forming a positive connection. Alternatively or additionally, the sealing element is held on the groove closure element, in particular directly, forming a positive connection. As a result, the groove or the cooling channel can be sealed off particularly reliably.Alternatively or additionally, it is provided in a further embodiment that the groove closure element is connected, in particular directly, in a form-fitting manner to the wall region of the laminated core. In other words, the groove closure element is held on the wall region of the laminated core, in particular directly, forming a positive connection. As a result, the groove closure element can be arranged particularly securely in the groove or in the opening of the groove, as a result of which the groove or the cooling channel can be held particularly tightly.In a further embodiment, it is provided that the sealing element is formed, in particular at least in regions, predominantly or completely, from at least one crystallized insulation material. The crystallized insulation material is, for example, a resin, in particular impregnating resin, for example epoxy resin, and / or an adhesive, in particular low-viscosity adhesive. As a result, a particularly good sealing effect can be achieved by means of the sealing element. Furthermore, the manufacturing cost of the stator can be kept particularly low, wherein in particular manufacturing costs can be kept particularly low.In a further embodiment, it is provided that the cooling channel adjoins the winding at least in regions in the circumferential direction of the stator, in particular at least indirectly or directly. This means that the cooling channel is delimited or formed at least in regions by the winding at least in the circumferential direction of the stator. In other words, the cooling channel surrounds the winding at least partially in the circumferential direction of the stator. As a result, the winding can be cooled, in particular at least on a side of the winding facing in the circumferential direction of the stator, in particular directly, by means of the cooling duct, in particular by means of the coolant flowing through the cooling duct. Thus, a particularly intensive cooling of the winding can be effected.Alternatively or additionally, it is provided in a further embodiment that the cooling channel adjoins the winding at least in regions, in particular at least indirectly or directly, in the radial direction of the stator. This means that the cooling channel is at least partially, in particular at least indirectly or directly, delimited or formed by the winding in the radial direction of the stator. In other words, the cooling channel surrounds the winding at least partially in the radial direction of the stator. As a result, the winding can be cooled, in particular at least on a side of the winding facing in the radial direction of the stator, in particular at least indirectly or directly, by the cooling duct, in particular by the coolant flowing through the cooling duct. The particularly intensive cooling of the winding can thus be effected.In a further embodiment, it is provided that the cooling channel extends, in particular in the groove, on a first side of the winding and on a second side of the winding facing away from the first side in the circumferential direction, in particular opposite the first side. In other words, the winding is surrounded by the cooling channel on multiple sides, that is to say at least two sides, as a result of which the winding can be cooled in particular on multiple sides, that is to say at least two sides, by the cooling channel, in particular by the coolant flowing through the cooling channel. As a result, the winding can be cooled particularly intensively. The first and the second side are, for example, sides of the winding facing or facing in the circumferential direction of the stator.In a further embodiment, it is provided that at least one insulation, in particular an insulation extending at least in regions within the slot, is arranged on the winding, in particular on the conductor of the winding. In other words, the winding, in particular the conductor, is at least partially, in particular predominantly or completely, surrounded by the insulation, as a result of which the winding or the conductor is insulated or isolatable, in particular by means of the insulation. The term "insulation" can, however, be understood in particular to mean electrical insulation, for example for effecting galvanic separation. Preferably, the cooling channel is bounded or formed by the insulation at least in regions, in particular directly. In other words, the insulation can be acted upon, in particular directly, by the coolant flowing through the cooling channel in order to cool the winding via the insulation, that is to say with the aid of the insulation. This means in particular that the insulation is arranged, for example in the circumferential direction of the stator, between the inner slot lining and the winding. A direct or particularly direct cooling of the winding can thus be effected, in particular by the cooling medium acting on the insulation. As a result, the winding can be cooled particularly intensively.The insulation can be regarded as part of the winding, whereby the direct cooling of the winding by means of the cooling channel or the direct slot cooling can be understood to mean in particular a direct cooling of the insulation or of the conductor by means of the insulation.In a further embodiment, it is provided that the winding is designed as an endless shaft winding. The endless shaft winding can be understood in particular to mean that the, in particular electrical, conductor of the winding or a plurality of, in particular electrical, conductors of the winding are formed integrally, that is to say continuously. Furthermore, the endless shaft winding can be understood to mean a structure of electrical conductors which are formed into a mat, in particular before the arrangement in its installation position on the stator, in particular in the groove. In particular when the winding is designed as an endless shaft winding, the present invention is particularly advantageous since the slot can then be particularly large, for example, and the slot can be sealed particularly advantageously by means of the present invention. Furthermore, the manufacturing cost of the stator can be kept particularly low, since forming the cooling channels by an injection molding method cannot be possible in the stator with endless shaft winding. The endless shaft winding can be referred to in particular as an endless winding.A second aspect of the invention relates to an electric machine for a motor vehicle. Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second aspect of the invention and vice versa. The electric machine has a stator according to the first aspect of the invention. The electric machine preferably has a rotor. The electric machine is preferably designed as an electric traction machine, in particular for driving the motor vehicle.A further aspect relates to a method for producing a stator according to the first aspect of the invention. In this case, for example, the groove inner lining is arranged in the groove, which means that the groove can be lined or lined by means of the inner lining. For example, the winding is arranged in the groove and in particular fastened to the laminated core. For example, in particular after the arrangement of the groove inner lining and / or the winding, the sealing element is arranged in the groove. For example, in particular subsequently, the groove or the openings of the groove are closed by means of the groove closure element.Further features of the invention are evident from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively specified combination but also in other combinations or alone.The invention will now be explained in more detail on the basis of a preferred exemplary embodiment and with reference to the drawings. The following are shown: FIG. 1 shows a schematic partial sectional view of a stator according to the invention; and FIG. 2 shows a schematic detailed view of the stator according to the invention from FIG. 1.In the figures, identical or functionally identical elements are provided with identical reference symbols.FIG. 1 shows a schematic partial sectional view of a stator 1 for an electric machine 2 of a motor vehicle. Thus, FIG. 1 shows in particular a partial view of the stator 1 or of the electric machine 2. The electric machine 2 has a rotor, which is not shown in FIG. 1.The stator 1 has at least one laminated core 3 which has at least one groove 4. In the exemplary embodiment shown in FIG. 1, a plurality of slots 4 are provided, which can be referred to in particular as stator slots. For example, the grooves 4 are spaced apart from one another in the circumferential direction 5 of the stator 1, and are arranged in particular in an equally distributed manner on the laminated core 3 or on a laminated core body of the laminated core 3.For example, the respective groove is open on a side of the stator 1, in particular of the laminated core 3, facing the rotor. This means that the respective groove 4, in particular at least one end, is open on the side 6 facing the stator 1, that is to say has at least one opening 7. The opening 7 can be referred to in particular as a groove opening. In the exemplary embodiment, the rotor adjoins the stator 1, in particular the laminated core 3, toward the inside in the radial direction 8 of the stator. Thus, the electric machine 2 is designed as an internal rotor in the exemplary embodiment. In the exemplary embodiment, at least one air gap is arranged between the, in particular respective, groove 4, in particular its opening 7, and the rotor. Thus, the groove 4, in particular the respective groove, leads for example at one end, in particular inward in the radial direction of the stator, preferably via the opening 7, into the air gap.In the exemplary embodiment shown in FIG. 1, the respective groove 4 is bounded or formed by the respective wall region 11 at the other end, that is to say in the radial direction 8 on a side facing away from the side 6 facing the rotor, which side can be referred to in particular as a side facing away from the rotor. The latter side of the groove 4 can be referred to in particular as the groove base. The respective groove 4 is therefore closed at the other end, that is to say is not open.The stator 1 has at least one winding 9, which is held in particular directly on the laminated core 3 and is arranged at least in regions in the at least one slot 4. The winding 9 can be arranged in the respective slot 4, that is to say arranged in each of the slots 4. This means that the winding 9 extends in regions in the slots 4, that is to say runs through the slots 4. Alternatively, it can be provided that the stator has a plurality of windings 9, wherein, for example, in each case one of the respective windings 9 is arranged in the respective slot 4.The respective groove 4 is closed in the radial direction 8 of the stator, in particular on the side 6 facing the stator 1, that is to say for example inward in the radial direction 8 of the stator, at least partially by means of an, in particular respective, groove closure element 10, which is arranged in particular in the respective opening 7. In the exemplary embodiment, a plurality of groove closure elements 10 are provided, wherein the respective groove 4 is closed in each case by means of one of the respective groove closure elements 10. Thus, for example, several individual groove closure elements 10 can be provided. Alternatively, it is of course possible for only one, in particular exactly one, groove closure element 10 to be provided, for example, by means of which a plurality of grooves 4, in particular all grooves 4, are closed. In particular, the air gap adjoins the respective slot closure element 10 inwards, for example in the radial direction 8 of the stator 1.In order to be able to cool the stator 1, in particular the winding 9, particularly advantageously, it is provided that a wall region 11 of the laminated core 3, which wall region at least partially delimits the respective slot 4, is at least partially, in particular predominantly or completely, clad at least in the circumferential direction 5 of the stator 1 by means of at least one slot inner cladding 12 formed separately from the slot closure element 10 and in particular separately from the laminated core 3. This is illustrated in FIG. 2, in which a schematic detailed view A is shown. The inner slot lining 12 delimits at least partially at least one respective cooling channel 13 which extends at least in regions within the respective slot 4 and through which a coolant can flow, by means of which the winding 9 can be cooled, in particular at least indirectly or directly. In other words, the groove inner lining 12 is formed as an outer wall of the cooling channel 13 which delimits the respective cooling channel 13 outwards, for example in the circumferential direction 5 of the stator 1 and / or in the radial direction 8 of the stator 1, or for the cooling channel 13. In particular, the groove inner lining 12 can be directly acted upon by the coolant flowing through the cooling channel 13. Thus, the cooling channel 13 can be understood to mean, in particular, a, preferably direct, slot cooling, in particular winding cooling. The winding 9 can thereby be cooled particularly well or particularly intensively.In the respective groove 4, in particular in the radial direction 8 of the stator 1, at least one sealing element 14 is arranged between the respective groove inner lining 12 and the respective groove closure element 10, which sealing element is formed separately from the respective groove inner lining 12 and the respective groove closure element 10. The respective groove 4 can thereby be particularly well sealed with respect to coolant unintentionally emerging from the respective cooling channel 13, as a result of which, for example, entry of the coolant into the air gap can be avoided.In the exemplary embodiment, the respective groove 4, in particular likewise, is lined or lined outwards in the radial direction 8 of the stator 1, that is to say in particular on the side facing away from the rotor, by means of the inner groove lining 12. For example, the respective groove 4 on the side 6 facing the stator, i.e. in particular in the inward direction 8 of the stator 1, is not lined or lined by means of the inner groove lining 12. This means that the lining by means of the inner slot lining 12 on the side 6 facing the rotor, i.e. in particular in the inward direction 8 of the stator 1, is omitted.It is preferably provided that the respective groove inner lining 12 is formed from plastic 16. The groove interior lining 12 can therefore be referred to in particular as a plastic groove lining. A wall thickness 17 of the respective groove inner lining 12 is, for example, between 0.1 millimeter and 0.35 millimeter.Alternatively or additionally, it is provided in the exemplary embodiment that the respective groove inner lining 12 is formed as an insert part 18, which can be inserted or is inserted into the respective groove 4 for arrangement in its installation position 19 provided in the stator 1.In the exemplary embodiment, it is furthermore provided that the respective sealing element 14 is connected in a positive-locking manner to the wall region 11 of the laminated core 3 and / or in a positive-locking manner to the respective groove closure element 10. Alternatively or additionally, it is provided in the exemplary embodiment that the respective groove closure element 10 is connected in a form-fitting manner to the wall region 11 of the laminated core 3. The respective groove closure element 10 is, for example, wedge-shaped, i.e. designed as a wedge, whereby the respective groove closure element 10 can be referred to in particular as a groove closure wedge.The respective sealing element 14 is formed, for example, from a crystallized insulating material 20, such as impregnating resin, in particular epoxy resin, and / or low-viscosity adhesive. Preferably, the sealing element 14 abuts, in particular directly, on the groove inner lining 12 and / or on the groove closure element 10.In the exemplary embodiment, it is provided that the respective cooling channel 13 adjoins the winding 9 at least in regions in the circumferential direction 5 of the stator 1 and / or in the radial direction 8 of the stator 1.Furthermore, it is provided in the exemplary embodiment that the respective cooling channel 13 extends at least on a first side 21 of the respective winding 9 and on a second side 22 of the respective winding facing away from the first side 21 in the circumferential direction 5, in particular opposite. This is illustrated in FIG. 2.In the exemplary embodiment, the winding 9 is designed as an endless shaft winding 36. For example, the winding 9 has a plurality of, in particular continuous, that is to say each formed in one piece, conductors 23 to 28. In the exemplary embodiment, six conductors 23 to 28 are shown by way of example. The respective conductor 23 to 28 can be understood in particular as a respective electrical conductor. The conductors 23- 28 may be formed separately from each other or integrally together. The conductors 23 to 28 are connected to one another at least indirectly, in particular directly, for example in the radial direction 8. For example, the respective conductor 23 to 28 is respectively guided through the grooves 4, that is to say in particular through all the grooves 4. Thus, the respective conductor 23 to 28 can extend in regions in the grooves 4, i.e. in particular in all the grooves 4.In the exemplary embodiment, the respective cooling channel 13 has in each case a plurality of respective length regions for cooling the respective conductors 23 to 28. Thus, in the respective groove 4, for example on the respective conductor 23 to 28, that is to say at least in the region of the respective conductor 23 to 28 or directly on the respective conductor 23 to 28, at least one of the respective length regions of the respective cooling channel 13 is arranged in each case. The respective groove 4 is thus traversed in particular by a plurality of length regions of the respective cooling channel 13. In this case, the respective longitudinal regions are at least partially delimited or formed by the respective groove interior lining 12.In the exemplary embodiment, at least one insulation 29 is arranged on the respective winding 9, which insulation delimits the respective cooling channel 13 at least in regions. The insulation 29 has, for example, a plurality of insulation parts 30 to 35, wherein a respective one of the conductors 23 to 28 is insulated in each case by means of the respective insulation part 30 to 35. On the respective conductor 23 to 28, a respective one of the insulation parts 30 to 35 of the insulation 29, in particular surrounding the respective conductor 23 to 28, is thus arranged, for example. In particular, the respective insulation part 30 to 35 delimits or forms the respective cooling channel 13, in particular the respective length region of the respective cooling channel 13. This means in particular that the respective cooling channel 13 extends at least in regions, in particular in the radial direction 8 of the stator 1, in each case between two of the respective conductors 23 to 28, and in particular between two of the respective insulation parts 30 to 35. A wall thickness of the insulation 29, in particular of the respective insulation part 30 to 35, is, for example, between 0.1 and 0.2 millimeters, in particular 0.15 millimeters. By means of the insulation 29, a short circuit can be particularly reliably avoided.For example, it is provided that the respective groove 4 is shaped in a curved manner in regions, i.e. for example has at least one respective curved portion 37. This can be seen particularly well in FIG. 2, for example. Preferably, a shape of the groove inner lining 12 follows the respective curvature 37, which means that the groove inner lining 12, which is preferably formed corresponding to the respective groove 4 or the respective wall region 11, is also formed curved or has the curvature. Preferably, the respective cooling channel 13 is formed at least in regions by the respective curvature 37. As a result, a cross section of the respective cooling duct 13 can be particularly increased, as a result of which a mass flow of the coolant flowing through the respective cooling duct 13 can be particularly increased, in particular in order to be able to cool the winding 9 particularly intensively. The respective bulge 37 can be understood in particular as a respective bulge.Overall, it can be seen that a stator 1 with direct slot cooling, in particular a stator lamination with direct slot cooling, can be created. In this case, the coolant, which is referred to in particular as cooling medium, can flow through oil channels, which are attached in particular directly, to the conductors 23 to 28, in the form of the cooling channels 13. The grooves 4 are lined in particular with a thin-wall plastic component in the form of the respective inner groove lining 12. In order to fill a cavity, in particular in the radial direction 8 of the stator, between the respective groove closure element 10, which is configured for example as a groove closure wedge, and the respective groove inner lining 12, a sealing compound in the form of the sealing element 14 is or is introduced in particular into the respective groove 4. The thin-wall plastic component can be understood in particular as a thin-wall plastic insert. In particular, high-performance stator cooling can be realized by means of oil directly on the conductors 23 to 28 in connection with the stator 1 having the continuous shaft winding 36.List of reference characters1 Stator 2 Electric machine 3 Laminated core 4 Slot 5 Circumferential direction of the stator 6 Side 7 Opening 8 Radial direction of the stator 9 Winding 10 Closure element 11 Wall region 12 Slot inner lining 13 Cooling duct 14 Sealing element 16 Plastic 17 Wall thickness 18 Insert part 19 Installation position 20 Crystallized insulation material 21 First side 22 Second side 23 First conductor 24 Second conductor 25 Third conductor 26 Fourth conductor 27 Fifth conductor 28 Sixth conductor 29 Insulation 30 First insulation part 31 Second insulation part 32 Third insulation part 33 Fourth insulation part 34 Fifth insulation part 35 Sixth insulation part 36 Endless shaft winding 37 Curvature A Detailed viewReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2021 109 441 A1

[0002]

Claims

Stator (1) for an electric machine (2) of a motor vehicle, having a laminated core (3) which has at least one slot (4), and having at least one winding (9) which is held on the laminated core (3) and is arranged at least in regions in the slot (4) and which is at least partially closed at one end in the radial direction (8) of the stator (1) by means of a slot closure element (10), characterized in that a wall region (11) of the laminated core (3) which at least partially delimits the slot (4) is at least partially clad at least in the circumferential direction (5) of the stator (1) by means of at least one slot inner cladding (12) which is formed separately from the slot closure element (4) and at least partially delimits at least one cooling duct (13) which extends at least in regions within the slot (4) and through which a coolant can flow, by means of which the winding (9) can be cooled, wherein at least one sealing element (14) formed separately from the groove inner liner (12) and the groove closure element (10) is arranged in the groove (4) between the groove inner liner (12) and the groove closure element (10).Stator (1) according to Claim 1, characterized in that • the inner slot lining (12) is formed from plastic (16), and / or • the inner slot lining (12) is formed as an insert part (18), which can be inserted into the slot (4) for arrangement in its installation position (19) provided in the stator (1).Stator (1) according to Claim 1 or 2, characterized in that the groove inner lining (12) has a wall thickness (17) of between 0.1 millimetres and 0.35 millimetres.Stator (1) according to one of the preceding claims, characterized in that • the sealing element (14) is connected in a positive-locking manner to the wall region (11) of the laminated core (3) and / or to the slot closure element (10), and / or • the slot closure element (10) is connected in a positive-locking manner to the wall region (11) of the laminated core (3).Stator (1) according to one of the preceding claims, characterized in that the sealing element (14) is formed from a crystallized insulation material (20).Stator (1) according to one of the preceding claims, characterized in that the cooling duct (13) adjoins the winding (9) at least in regions in the circumferential direction (5) of the stator (1) and / or in the radial direction (8) of the stator (1).Stator (1) according to one of the preceding claims, characterized in that the cooling duct (13) extends on a first side (21) of the winding (9) and on a second side (22) of the winding (9) facing away from the first side (21) in the circumferential direction (5) of the stator (1).Stator (1) according to one of the preceding claims, characterized in that at least one insulation (29) is arranged on the winding (9), said insulation delimiting the cooling duct (13) at least in regions.Stator (1) according to one of the preceding claims, characterized in that the winding (9) is designed as an endless shaft winding (36).Electric machine (2) for a motor vehicle, having a stator (1) according to one of the preceding claims.

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