End plate for a laminated core of a stator

Abstract

The invention relates to an end plate for a laminated corner of a stator of an electric machine, having an annular contour, which extends between one side of the laminated core and a winding head side of the end plate, and multiple radial guide openings on the laminated core side which are mutually spaced in the circumferential direction of the annular contour and each of which is designed to guide a flow of coolant from a laminated core axial coolant channel arranged further inwards on the stator to a coolant outlet arranged further outwards on the end plate.

Description

[0001] End plate for a stator laminated core

[0002] The invention relates to an end plate for a laminated core of a stator of an electrical machine and a stator for an electric drive motor in a motor vehicle.

[0003] If the necessary cooling of the stator in an electric drive motor for a motor vehicle takes place via cooling channels close to the slot, a number of challenges arise in connection with the coolant guidance beyond the laminated core to the winding heads and with the assembly of the stator.

[0004] With regard to coolant flow, the challenge arises of ensuring sufficient and as even a spray coating as possible on the winding heads. Current solutions achieve this by assembling the core stack using a complex arrangement of variously punched individual laminations. Such a solution implies a massive increase in the complexity of the punching process and a concomitant increase in costs.

[0005] A manufacturing issue is that each winding slot containing enameled copper wire and slot insulation paper must be filled with resin at least to a certain extent. This ensures that the conductors remain insulated from one another and that they do not become acoustically noticeable. However, this dripping process can lead to deposits of resin on the end faces of the laminated core. This is problematic with the conventional use of additional axial coolant channels near the winding slot (also known as near-slot) through which a coolant is intended to flow during operation, because the deposits - or in the worst case even a resin blockage - hinder or prevent the required circulation of the coolant to the winding overhangs, thus impairing cooling.

[0006] Against this background, it is an object of the invention to improve cooling of the winding heads of a stator, in particular for an electric drive motor of a motor vehicle.

[0007] Each of the independent claims, with its features, defines a subject matter that solves this problem. The dependent claims relate to advantageous developments of the invention.

[0008] According to one aspect, an end plate for a laminated core of a stator of an electric drive machine, in particular in a motor vehicle, is disclosed.

[0009] The end plate has a ring contour with a ring wall thickness which extends between a laminated core side - i.e. a side which is designed to face the laminated core - and a winding head side - i.e. a side which is designed to face a winding head of the stator - of the end plate.

[0010] Furthermore, the end plate has a plurality of radial guide recesses, spaced apart from one another in the circumferential direction, on the laminated core side of the ring wall thickness, each of which is designed, in particular in cooperation with a side wall of an outer sheet of the laminated core, to guide a coolant flow from a coolant axial channel of the laminated core, arranged radially further inward on the stator, to a coolant outlet arranged radially further outward on the end plate and directed towards the winding head side. By guiding the coolant radially outward on the end plate, wetting of the entire winding head, in particular from the radial outside, can be ensured even with coolant axial channels close to the groove, which can, for example, be arranged at an overlapping radial position with the winding grooves.

[0011] In addition, the design of the coolant outlets on a separately designed end plate (instead of on the laminated core itself) reduces the risk of accidentally blocking the coolant outlets with the drip resin used to fill the winding slots away from the respective winding.

[0012] Furthermore, the design of coolant outlet nozzles in the laminations of the laminated core itself has a negative effect on the electromagnetic properties of the laminated core, so that their formation on the end plate instead has a beneficial effect.

[0013] According to a further aspect, a stator for an electric drive motor in a motor vehicle is disclosed. The stator has a laminated core with a plurality of winding slots and a plurality of axial coolant channels arranged circumferentially between the winding slots. On both sides of the laminated core, the stator has a stator winding head extending from the respective axial ends of the winding slots. An end plate according to an embodiment of the invention is arranged on each side of the laminated core.

[0014] The invention is based, among other things, on the consideration that the front openings of the cooling channels near the groove are positioned in a number of unfavorable ways, or are aligned, within the laminated core. The creation of spray holes in the outer sheets of the laminated core is very complex and cannot be realized electromagnetically without compromises. Likewise, as described at the beginning, the automated trickling process is difficult to carry out in a way that reliably prevents the openings from being bonded. Spray nozzles punched into the laminated core have a negative electromagnetic effect and thus cause a deterioration in the active length. This results in a deterioration in the power-related relative weight of the stator. The invention is based, among other things, on the idea of ​​providing an end plate on both sides of the laminated core, designed, for example, as a cooling medium transfer plate.

[0015] The end plate solves the problems described for stators cooled with oil close to the groove by directing the cooling medium flow radially outward to a larger radius, where it can be transferred to a separate winding head cooling module or sprayed out. This also prevents the axial channel openings from becoming blocked when the stator is drip-coated, and any necessary masking to protect the openings can be applied more easily. This is because the channel openings are then no longer located in the immediate vicinity of the drip-coat resin nozzle.

[0016] Steel, for example, is a suitable material for the transfer plate because, like the laminations of the core stack itself, it can be bonded to the core stack with self-bonding varnish. Additionally, a step in the housing can ensure that the transfer plate is pressed against the stator. The end plate is then designed in such a way that the clearance and creepage distance between the copper (Cu) conductors of the winding heads and the core stack is not compromised, so that the winding head dimensions do not deteriorate despite the installation of the end plate.

[0017] Alternatively, a dielectric plastic material (e.g. PA6 or PA12) can be used, for example if it is not possible to package the transfer contour simultaneously with the rest of the laminated core. Such an end plate could be made in one piece if glued before stator production, or in several parts if screwed onto the laminated core later after stator production in order to take into account the undercut of the radial oil channels behind the conductors. A plastic end plate can then have a high-temperature-resistant hard component for the transfer geometry and a high-temperature-resistant soft component for the sealing surface to the laminated core, and can be manufactured using a multi-component injection molding process, for example. It can be screwed on, for example, using countersunk screws that do not protrude beyond the contour.According to one embodiment, the radial guide recesses are spaced apart from one another, in particular evenly, according to the positioning of the coolant axial channels. Thus, the coolant can be guided axially outward directly from one axial end of each coolant axial channel.

[0018] According to one embodiment, each radial guide recess or two or more radial guide recesses are assigned a coolant outlet. In the first alternative embodiment, the coolant that has flowed through a specific coolant axial channel can cool the associated part of the winding head at the corresponding bypass position. In the second alternative embodiment, the coolant can still be effectively sprayed even under unfavorable pressure conditions because fewer outlets need to be served. With a separate coolant outlet for each coolant axial channel, the required pump pressure would be very high, reducing the efficiency of the machine. If the pressure were kept constant, only a trickle would emerge from the holes, which would end up in the air gap. For this reason, it is necessary to reduce the number of openings.To make matters worse, the smaller the holes are punched, the shorter the service life of the punching tools would be. Many small holes have to be balanced against fewer, but larger ones.

[0019] According to one embodiment, the coolant outlet is designed as a spray nozzle, particularly designed to wet the winding heads with coolant and / or directed toward the winding heads. In this embodiment, the winding head can be sufficiently sprayed or wetted with coolant due to the appropriate design of the coolant outlet(s). The oil channels on the laminated core side can be routed either into a single collection volume or into multiple collection volumes (the number of which is less than the number of oil channels).

[0020] According to an alternative embodiment, the coolant outlet is designed as a coolant interface to a winding head cooling module, which is designed to appropriately distribute the coolant to the winding head. In this embodiment, a further coolant guide is provided downstream of the end plate, and in particular downstream of the coolant outlets, which is designed such that the winding head can be optimally wetted with coolant as required. According to one embodiment, a coolant outlet located lower in the installed position of the stator is designed with a smaller cross-section than a coolant outlet located higher up.This can compensate for the effect of gravity in the distribution of the coolant to the individual coolant outlets and / or the fact that upper parts of the winding head are cooled exclusively by the coolant sprayed there, while our parts of the winding head can also be cooled by the coolant that runs off the upper parts.

[0021] According to one embodiment, the end plate comprises a steel material. In particular, it is formed from a steel material. In particular, the end plate comprises a dielectric layer that completely surrounds the contour of the end plate or only on the winding head side.

[0022] According to an alternative embodiment, the end plate is made of at least one plastic material, particularly a dielectric one. This allows the end plate to be easily arranged axially between the laminated core and the winding head, particularly on the teeth between the slots, without causing problems with clearance and creepage distances. An axial extension of the stator is not necessary for this. With a suitable design, the end plate can even contribute to electrically insulating the laminated core and the center head from each other, potentially even allowing for an axial shortening of the stator.

[0023] In particular, the end plate is designed as a multi-component component with a hard component for forming the radial guide recesses and the annular contour, and a soft component for forming a sealing surface for the laminated core. This allows an end plate to be manufactured in a known, and therefore simple and cost-effective, manner that meets both the structural and sealing requirements for the coolant guide.

[0024] According to one embodiment, several seals, particularly soft components, are provided, spaced apart from one another in the circumferential direction of the ring contour and formed circumferentially around one or more radial guide recesses. This makes it easier to form a reliable seal than with a single seal running along the entire circumference of the ring contour.

[0025] According to one embodiment, at least one recess is arranged in the circumferential direction between two radial guide recesses, so that the radial guide recesses are delimited by a remaining web, along the extent of which the end plate has the full annular wall thickness. This allows the end plate to be designed with the lowest possible dead weight.

[0026] According to one embodiment, the end plate is formed from two or more, in particular six, particularly identically formed, circumferential parts, which can be assembled in such a way that they form a circumferentially encircling end plate. An end plate composed of several components can be more easily marked—especially after the windings have been inserted into the winding slots. This ensures optimized cooling of both winding heads and enables undercut positioning of the component between the conductor tracks, for example, after the windings have been inserted.

[0027] According to one embodiment, the end plates are bonded to the laminated core using a bonding varnish, either completely or in a manner that is sufficiently coolant-tight for the application, particularly in a bonding process that is carried out simultaneously with the bonding of the laminated core sheets. Additionally or alternatively, the drip-coating process can be designed so that the drip-coating resin itself also contributes to the system's tightness. The capillary action of the minimally spaced individual sheets can be utilized, since the drip-coating resin is applied at the required positions anyway due to the system's design. This makes the stator particularly easy to manufacture—particularly with a very small number of steps.

[0028] According to an alternative embodiment, the radial guide recesses on the laminated core side of the end plates are defined by an elastic plastic component and clamped, in particular screwed, to the laminated core in such a way that the respective radial guide recess and the associated side of the laminated core define a radial guide in a coolant-tight manner. In this way, the end plate can be made entirely of a dialectical plastic—for example, as a two-component component—so that the stator can be optimized electromagnetically and, if necessary, also with regard to its axial dimension.

[0029] One way to assemble stators is using a hairpin twist method.

[0030] A hairpin twist process (also called a hairpin process chain) is an indirect process for winding production, particularly in stators of drive motors. Due to the massive conductor cross-section, the hairpins are geometrically adjusted before the assembly process for inserting the plug-in coils into the laminated core. In contrast to conventional stator production (with its winding-based assembly processes), a forming-based assembly process is used. A typical hairpin process chain usually has several higher-level process steps:

[0031] (i) Hairpin production: the typically pre-coated copper flat wire is continuously unwound and straightened, possibly in multiple stages, to reduce residual curvature and residual stresses. Since the copper ends of the individual hairpins are normally welded together in a later process step, partial stripping of the hairpin wire can be performed after the straightening process, either laser-based or mechanically. Depending on the desired hairpin geometry, the hairpin wire is cut to length and bent using a cutting process. The sequence of bending and cutting operations can vary. Hairpins are formed into the desired, possibly three-dimensional, geometry. This process is carried out either in a single stage using special CNC bending machines or in multiple stages using die bending and swivel bending.

[0032] (ii) Assembly and twisting: Since direct assembly of the hairpins into the laminated core is limited by overlaps in the winding head geometry and reliable insertion into the stator assembly must be ensured, the hairpins are usually pre-assembled in a so-called assembly sun. Depending on the winding pattern, the arrangement of the individual pins takes place during pre-assembly. A hairpin stator typically has at least three, usually up to 21 or more, different hairpin geometries. Parallel to pre-assembly, insulating paper is inserted into the stator slots. This serves to separate the winding system from the ground potential of the laminated core. After complete pre-assembly of the hairpins, the entire hairpin basket (also called hairpin nest) is inserted axially into the laminated core using a multiple gripping system.Due to very tight tolerances, hairpins are sometimes chamfered during the cutting process - positioning holders are also used if necessary. Depending on the winding pattern, the hairpin ends are interlaced in each layer. This process is also known as the twisting process. In addition to the rotary movement, the assembly tool also moves axially. To ensure axial access for a setting tool, the hairpin ends must be radially exposed in a preparatory step. The crucial point in the subsequent twisting production step lies in the beginning of the bending of the wires axially, viewed from the end face of the laminated core. If bending occurs too early, the slot insulation paper can tear, the LuK distances are not met, and damage is to be expected. To initiate the bending radius at the correct point, the collar support fingers are advanced radially and the bending is initiated at their shoulder.

[0033] Therefore, when twisting the hairpins, so-called collar support fingers are used. These radially positioned between the conductors ensure that the correct twist radius is introduced at the correct location on each hairpin. These support fingers vary depending on the system supplier, but in practice, they combine the radial adjustment and axial support of the bending forces into a single sheet package.

[0034] (iii) Welding and interconnection: Adjacent hairpin ends are now contacted according to the circuit diagram. Typically, a laser welding process is used for this purpose, which melts the hairpin ends and joins them together. During the welding process, attention should be paid to homogeneous weld geometries and minimizing thermal input into the hairpins. In order to pursue reproducible welding strategies, a particular challenge lies in creating a consistent initial welding situation. Height and lateral misalignment of the hairpin ends can lead to welding defects. To counteract this, correction processes are sometimes used, depending on the tolerances of upstream processes.(iv) Rendering of a hairpin stator: To implement phase shifts and the winding connection, interconnection elements such as contact rings, plug-in bridges, terminal blocks, or jumpers are then connected to the welded hairpin ends. This process is usually also carried out using a laser welding process.

[0035] Secondary insulation: After wiring, the final step involves insulating the welded copper ends and, if necessary, impregnating the stator. The insulation of the copper ends is usually achieved by powder coating or the application of casting resins, for example, polyurethane-based. Potting typically involves impregnation, trickle-coating, or full-coating processes. Impregnation can be performed in a similar way to the impregnation processes used in the manufacture of conventionally wound stators. Impregnation serves to protect against thermal, electrical, ambient, and mechanical influences. Immersion or trickle-coating processes are also commonly used for impregnation.

[0036] In hairpin twist processes, elevations on the front side of the laminated core that extend beyond the magnetic active length impair handling during production and hinder the hairpin twist process.

[0037] According to one embodiment, the collar support fingers are formed on the end plate, in particular integrally therewith, and solve the manufacturing problem during twisting by a geometry analogous to the collar support fingers, contained on the end face of the laminated core, for example deep-drawn, which then remains on the stator.

[0038] The coolant-carrying part is manufactured using a two-component injection molding process so that twisting results in axial compression with the laminated core, ensuring coolant tightness. The challenge in seal design lies in considering, on the one hand, the springback of the wires after twisting and, on the other hand, the thermal expansion of the various materials used.

[0039] According to one design, the coolant-carrying part of the geometry is designed in such a way that the ducts on the laminated core side are brought together in such a way that they can be guided radially further outwards towards the winding head at a suitable position:

[0040] According to one embodiment, the geometry is designed in such a way that there is no deterioration in the clearance and creepage distance between the copper conductor of the winding on the one hand and the laminated core on the other hand, which means that the winding head dimensions do not deteriorate.

[0041] According to one embodiment, the end plate has a collar support finger at a circumferential region, in particular at a circumferential position, of one, several or all of the radial guide recesses, which collar support finger extends, in particular starting from the annular contour, radially inwards, in particular further than a radial position of one or more coolant axial channels. In other words, according to one embodiment, the end plate has a collar support finger at a circumferential position of each winding slot, which collar support finger extends, in particular starting from the annular contour, radially along part or all of a radial extent of the winding slots of the stator. When twisting the hairpins, collar support fingers are used, which ensure that the correct twist radius is introduced at the correct location on each hairpin.

[0042] According to one design, the collar support finger(s) is / are made of the material of a hard component of a two-component injection-molded component. This allows the end plate to be manufactured in such a way that twisting results in axial compression on both sides with the laminated core, ensuring oil tightness. The hairpins are pulled slightly toward the switching ring side during the twisting process, causing the A-side to constrict. Therefore, different configurations of the collar support finger contour are provided on the A and B sides of the star ring.

[0043] The A-side contour has a shape that already takes into account the mechanical shaping of the hairpin roofs, the B-side contour takes into account the twisting process.

[0044] According to one embodiment, the collar support finger(s) is / are arranged within an axial range of the ring wall thickness. The collar support fingers integrated into the geometry solve the manufacturing problem during twisting by using a geometry similar to that of the collar support fingers, which then remains on the stator.

[0045] According to one embodiment, the collar support finger(s), in particular each, has a support projection that extends beyond the axial extent of the ring contour on the winding head side with respect to a center axis of the circular contour of the end plate. This allows the hairpins to be twisted at a specified distance from the laminated core, in particular without damaging the slot insulation paper.

[0046] According to one embodiment, the support projection has a rounded, roof-like support surface, which in particular extends radially and / or covers part of a fictitious plane of the ring contour. Thus, the hairpins can be bent on the support surface and / or supported after bending.

[0047] Further advantages and possible applications of the invention will become apparent from the following description in conjunction with the figures:

[0048] Fig. 1 shows a stator with two end plates according to a first exemplary embodiment of the invention.

[0049] Fig. 2 shows a section of the stator of Figure 1.

[0050] Fig. 3 shows a partially sectioned section of one of the end plates of the stator of Figure 1.

[0051] Fig. 4 shows a sectional view of the stator of Figure 1.

[0052] Fig. 5 shows a view of the stator of Figure 1 without the windings.

[0053] Fig. 6 shows in Fig. 6A the winding head side and in Fig. 6B the laminated core side of one of the end plates of the stator of Figure 1.

[0054] Fig. 7 shows a section of an end plate which can be used alternatively in the stator of Figure 1 according to a second exemplary embodiment, with a plurality of longer collar support fingers and a circumferential seal designed as an elastomer seal.

[0055] Fig. 8 shows in Fig. 8A the laminated core side and in Fig. 8B the winding head side of the alternative end plate from Fig. 7.

[0056] Fig. 9 shows a stator with two different end plates according to a third exemplary embodiment of the invention (on the “A” side of the electric drive machine) or a fourth exemplary embodiment of the invention (on the “B” side of the electric drive machine) in a side view.

[0057] Fig. 10 shows the stator of Figure 9 in an oblique view of the “B” side.

[0058] Fig. 11 shows the end plate according to the third exemplary embodiment of the invention (on the “A” side of the electric drive machine) in an oblique frontal view.

[0059] Fig. 12 shows the end plate according to the third exemplary embodiment of the invention in a frontal view.

[0060] Fig: 13 a / b illustrates the difference in the support projections of the end plate according to the third exemplary embodiment and the fourth exemplary embodiment

[0061] Fig. 14 shows the end plate according to the third exemplary embodiment of the invention in a rear view of the radial guide recesses and of several individual seals of radial guide recesses designed as elastomer seals.

[0062] Fig. 15 a / b shows, in different views, a sealed radial guide recess of the end plate from Fig. 14. Fig. 1 shows a stator 1 for an electric drive motor in a motor vehicle. The stator 1 has a laminated core 2 with a plurality of winding slots 4 and a plurality of coolant axial channels 6, which are arranged in the circumferential direction U between the winding slots 4. On both sides of the laminated core 2, the stator 1 has a stator winding head 8.1 and 8.2, respectively, starting from the respective axial ends of the winding slots. On both sides of the laminated core 2, an end plate 10 according to an embodiment of the invention is arranged.

[0063] Each of the two end plates 10 has a ring contour 12 with a ring wall thickness X_R, which extends between a laminated core side P and a winding head side D of the end plate 10.

[0064] Furthermore, the end plate 10 has a plurality of radial guide recesses 14 on the laminated core side P, which are spaced apart from one another in the circumferential direction U and which are each designed, in cooperation with a side wall of an outer sheet of the laminated core 2, to guide a coolant flow F from a coolant axial channel 16 of the laminated core 2, which is arranged further inside on the stator 1 in the radial direction R, to a coolant outlet 18 arranged radially further outward on the end plate 10 and directed towards the winding head side D and thus towards one of the stator winding heads 8.1 or 8.2.

[0065] The geometry and function of the end plate 10 in general and of the radial guide recesses 14 in particular can be clearly seen in Fig. 3 and Fig. 4 and Fig. 6B.

[0066] By guiding the coolant radially outwards on the end plate, wetting of the entire winding head from the radial outside can be ensured even with axial coolant channels close to the groove.

[0067] From the enlarged section of Figure 1 in Figure 2, it can be seen that in the exemplary embodiment, the radial guide recesses 14 begin radially so far inward that their radially inner ends enable the alignment and / or fixing of the end plate 10 in the circumferential direction U to be determined. In the exemplary embodiment of Figures 1 to 6, regions of the end plate are thus already formed which extend radially inward. Nevertheless, these regions are not yet formed radially so far inward that they can serve as collar support fingers 120 (cf. Figures 7 and 8) in the hairpin twist process. Another exemplary embodiment of an end plate 110 with such collar support fingers 120 is shown in Figures 7 and 8 and explained in the associated figure descriptions.

[0068] Further features and advantages can be seen from the various views of the first exemplary embodiment of the invention in Fig. 3, Fig. 4, Fig. 5 and Fig. 6:

[0069] The radial guide recesses 14 are arranged at the circumferential positions of the coolant axial channels 16 and are therefore evenly spaced from one another in the circumferential direction. This allows the coolant to be guided axially outward directly from one axial end of each coolant axial channel.

[0070] In addition, each radial guide recess 14 is assigned a coolant outlet 18. Therefore, the coolant that has flowed through a specific coolant axial channel can cool the associated part of the winding head at the corresponding handling position.

[0071] In the exemplary embodiment, each of the coolant outlets 18 is configured to wet the winding heads with coolant and is directed toward the winding heads so that the coolant can spray out there.

[0072] In the exemplary embodiment, the end plate 10 is designed as a dielectric plastic component, manufactured using a two-component injection molding process. A hard component made of a heat-resistant plastic is provided, which, among other things, together with a side surface of the outermost sheet of the laminated core 2, defines the radial guide recesses 14. In addition, a soft or elastic component made of a different heat-resistant plastic is provided, which seals the contact surfaces between the end plate 10 and the laminated core 2. This allows the end plate to be easily arranged axially between the laminated core 2 and the winding overhang 8 without causing problems with clearance and creepage distances. An axial extension of the stator 1 is not necessary for this.

[0073] Fig. 7 and Fig. 8 show different views of an end plate 110, which additionally has fully formed collar support fingers 120. Furthermore, the geometry of the radial guide recesses 114 and the coolant outlets 118 is different from the other embodiment shown in Figs. 1 to 6, but there are no fundamental functional differences between the two designs.

[0074] A collar support finger 120 is provided on a circumferential region of each of the radial guide recesses 114, which extends radially inward from the annular contour 12 further than the winding slots 4 of the stator 1. The circumferential extent of the collar support fingers is designed such that each finger 120 precisely covers the circumferential space between two winding slots 4, so that the collar support finger 120 can optimally serve to support the hairpin curvature.

[0075] The collar support fingers 120 are formed from the material of a hard component of a two-component injection-molded component and are manufactured in such a way that twisting results in axial compression with the laminated core, which contributes to coolant tightness. In the illustrated embodiment, a single circumferential seal 115 is provided on the annular contour 12 radially inside the radial guide recesses 114 for the sealing effect. The circumferential seal 115 is formed from the material (particularly elastomer) of a soft component of the two-component injection-molded component.

[0076] In Fig. 9, a stator 201 is shown with a first end plate 210 according to a third exemplary embodiment of the invention on the “A” side of the electric drive machine and a second end plate 310 according to a fourth exemplary embodiment of the invention on the “B” side of the electric drive machine.

[0077] The collar support fingers 220 and 320 of the two end plates 210 and 310 each have a support projection 222 and 322, respectively, which extends beyond the axial extent of the ring contour 12 on the winding head side D. The support projections 222 and 322 each have a rounded, roof-like support surface 224 and 226, respectively.

[0078] The end plates 210 and 310 differ in the longitudinal extent (along the longitudinal axis L) of a respective support projection 222 or 322 and the design of a respective associated support surface 224 or 324. The differences in design and function can be seen in detail in particular in Figure 13:

[0079] During the twisting process, the hairpins are pulled slightly toward the switching ring side, causing the "A" side to constrict. Therefore, different configurations of the collar support finger contours are provided for the "A" and "Beseitig" side of the star ring.

[0080] The "removed contour" has a shape that already takes into account the mechanical forming of the hairpin roofs; therefore, the support projections 222 are axially longer with an axial extension L_A, and the support surfaces 224 are rounded in a roof-like manner so that the roofs can form and / or attach to them. The "removed contour" takes into account the twisting process, so that the support projections 322 are axially shorter with an axial extension L_B.

[0081] Fig. 10 shows the stator 201 of Figure 9 in an oblique view of the "B" side. This view clearly shows that the coolant outlets 318 of the end plate 310 (and also the coolant outlets 218 of the end plate 210 on the "A" side, not visible here) are designed as circular recesses—and are relatively small to support a high discharge pressure.

[0082] Fig. 11 shows an oblique frontal view of the end plate 210 on the "A" side of the electric drive unit. In particular, the collar support fingers 220 with the support projections 222 and the shape of the support surfaces 224 are clearly visible.

[0083] Fig. 12 shows a frontal view of the end plate 210. This view particularly highlights the radially outer wave shape of the ring contour 212, which serves to save material at the circumferential positions where no coolant flow is required.

[0084] In Fig. 14, the end plate 210 is shown in a rear view, so that the radial guide recesses 214 can be seen. Each of the radial guide recesses 214, which are spaced apart from one another in the circumferential direction, is designed as a radial guide recess 214 with a circumferential individual seal 215 for guiding coolant from two adjacent coolant axial channels to the coolant outlet 218, wherein the respective individual seal 215 is designed only to seal this one radial guide recess 214 and is made of a softer sealing plastic (for example in the sense of a 2K component; in particular of an elastomer material).

[0085] In Fig. 15 a / b, a sealed radial guide recess 214 of the end plate 210 from Fig. 14 is shown enlarged in different views.

[0086] LIST OF REFERENCE SYMBOLS

[0087] Stator 1 , 201

[0088] Sheet metal package 2

[0089] Winding slots 4

[0090] Coolant axial channels 6

[0091] Stator winding head 8.1 , 8.2

[0092] End plate 10, 110, 210, 310

[0093] Ring contour 12, 212

[0094] Radial guide recesses 14, 114, 214

[0095] Coolant axial channel 16

[0096] Coolant outlet 18, 118, 218, 318

[0097] Circulating seal 115

[0098] Collar support fingers 120, 220, 320

[0099] Single seal 215

[0100] Support projection 222, 322

[0101] Support surface 224, 324

[0102] A-side of the electric drive machine A

[0103] B-side of the electric drive machine B

[0104] Winding head side D

[0105] Coolant flow F

[0106] Laminated core side P

[0107] Radial direction R

[0108] Circumferential direction U

[0109] Ring wall thickness X_R

[0110] Axial extensions L_A, L_B

Claims

CLAIMS 1. End plate (10, 110, 210, 310) for a laminated core (2) of a stator (1, 201) of an electrical machine, comprising - a ring contour (12) extending between a laminated core side (P) and a winding head side (D) of the end plate, - on the laminated core side, a plurality of radial guide recesses (14, 114, 214) spaced apart from one another in the circumferential direction (U) of the ring contour, each of which is designed to guide a coolant flow (F) from a coolant axial channel (16) of the laminated core arranged further inside on the stator in the radial direction (R) to a coolant outlet (18, 118, 218, 318) arranged radially further outside on the end plate towards the winding head side (D).

2. End plate according to claim 1, characterized in that the radial guide recesses are spaced from one another, in particular uniformly, in accordance with a positioning of the coolant axial channels.

3. End plate according to one of the preceding claims, characterized in that each radial guide recess or two or more radial guide recesses are jointly assigned a coolant outlet.

4. End plate according to one of the preceding claims, characterized in that the coolant outlet is designed as a spray nozzle.

5. End plate according to one of the preceding claims, characterized in that a coolant outlet arranged further down is designed with a smaller cross-section than a coolant outlet arranged further up.

6. End plate according to one of the preceding claims, comprising a steel material and / or at least one plastic material.

7. End plate according to one of the preceding claims, designed as a multi-component component with a hard component for forming the radial guide recesses and the ring contour, and with one or more soft components for forming a seal (115, 215), in particular with a sealing surface, for the laminated core. End plate according to one of the preceding claims, characterized in that a plurality of seals (215) are provided, spaced from one another in the circumferential direction of the annular contour and formed circumferentially around one or more radial guide recesses. End plate according to one of the preceding claims, formed from two or more, in particular six, in particular identically formed, circumferential parts. End plate according to one of the preceding claims, characterized by a collar support finger (120, 220, 320) extending radially inward on a circumferential region of one, several, or all of the radial guide recesses. End plate according to one of the preceding claims, characterized by a collar support finger, which extends radially along part or all of a radial extent of the winding slots (4) of the stator, at a circumferential position of each winding slot.End plate according to one of the preceding claims 10 or 11, characterized in that the collar support finger(s) is / are formed with the material of a hard component of a two-component injection-molded component. End plate according to one of the preceding claims 10 to 12, characterized in that the collar support finger(s) are arranged within an axial region (X_R) of the radial guide recesses (14). End plate according to one of the preceding claims 10 to 13, characterized in that the collar support finger(s) have a support projection (222, 322) which extends on the winding head side beyond the axial extent of the annular contour. End plate according to claim 14, characterized in that the support projection has a rounded, roof-like support surface (224, 324). Stator (1, 201) for an electric drive machine in a motor vehicle, comprising. - a laminated core (2) with a plurality of winding slots (4) and coolant axial channels (16) arranged in the circumferential direction (U) between the winding slots, - a stator winding head (8.1, 8.2) on both sides of the laminated core, extending from the respective axial ends of the winding slots, characterized by an end plate (10, 110, 210, 310) according to one of the preceding claims on both sides of the laminated core. Stator according to claim 16, characterized in that the end plates are bonded to the laminated core in a coolant-tight manner by means of a baking varnish. Stator according to claim 16, characterized in that the radial guide recesses on the laminated core side (P) of the end plates are defined by an elastic plastic component and clamped to the laminated core.

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