End plates for stator laminated cores

Abstract

To improve cooling of a stator head of a stator for an electric drive machine of a motor vehicle. An end plate (10) for a laminated core (2) of a stator (1) of an electric machine is a ring contour 12 extending between the laminated core side of the end plate 10 and the winding head side D; - On the laminated core side, a plurality of radial guide recesses 14 spaced apart from each other in the circumferential direction of the ring contour portion 12; It is equipped with The radial guide recess 14 is configured to guide the cooling medium flow F from the cooling medium axial passage 6, which is arranged further radially inward in the stator 1 of the laminated core 2, toward the winding head side D and toward the cooling medium outlet 18, which is arranged further radially outward in the end plate 10.

Description

[Technical Field]

[0001] The present invention relates to an end plate for a laminated core of a stator of an electric machine and to a stator for an electric traction machine in a motor vehicle. [Background technology]

[0002] In electric motor vehicle traction machines, where the required cooling of the stator is achieved via cooling passages adjacent to the grooves, a series of challenges arise in connection with the assembly of the stator and the guidance of the cooling medium over the laminated core to the winding head.

[0003] With regard to the guidance of the cooling medium, the problem arises of ensuring sufficient and as uniform as possible wetting of the winding heads with the cooling medium spray. In known solutions, this is achieved by a complex arrangement of differently perforated individual sheets (individual steel sheets) in the assembly of the laminated core. This solution leads to a significant increase in the complexity of the perforation process and the associated increase in costs.

[0004] A manufacturing problem is that each winding groove, where the enamel-coated copper wire and groove insulation paper are located, must be filled with trickle resin to at least some extent. This ensures that the conductors remain insulated from one another and are not acoustically noticeable. However, this trickle resin process in laminated cores can lead to deposits of trickle resin on the end faces. This is problematic when using axial coolant channels near additional winding grooves (also called groove neighbors), through which the coolant flows during operation, as is known per se. This is because deposits (or, in the worst case scenario, blockages of trickle resin) can impede or block the necessary circulation of coolant to the winding head, resulting in poor cooling. Summary of the Invention [Problem to be solved by the invention]

[0005] In this context, the object of the present invention is to improve the cooling of the winding heads of stators for electric drive machines, in particular for motor vehicles. [Means for solving the problem]

[0006] Each independent claim specifies the object which the problem is solved by its features. The dependent claims relate to advantageous developments of the invention.

[0007] According to one aspect, an end plate for a laminated core of a stator of an electric drive machine, particularly in a motor vehicle, is disclosed.

[0008] The end plate has a ring contour portion with a ring wall thickness, which extends between the laminated core side (i.e., the side configured to face the laminated core) and the winding head side (i.e., the side configured to face the winding head of the stator) of the end plate.

[0009] The end plate also has a plurality of radial guide recesses spaced apart in the circumferential direction on the laminated core side of the ring wall thickness, and these radial guide recesses are configured to cooperate, in particular with the side wall of the outer thin plate (iron plate) of the laminated core, to guide the coolant flow from the coolant axial passage of the laminated core, which is located further radially inward in the stator, to a coolant outlet, which is located further radially outward in the end plate and faces the winding head side.

[0010] By guiding the cooling medium radially outward in the end plates, it is possible to ensure wetting of the entire winding head, particularly from the radial outside, even in the axial cooling medium channels near the grooves, which may be arranged in a radial position overlapping the winding grooves, for example.

[0011] Additionally, the formation of the coolant outlets in separately formed end plates (instead of in the laminated core itself) reduces the risk of trickle resin filling the winding grooves away from each winding accidentally blocking the coolant outlets.

[0012] Furthermore, since the shape of the cooling medium outlet nozzle in the thin plate (iron plate) of the laminated core itself has an adverse effect on the electromagnetic characteristics of the laminated core, its formation in the end plate does not have this effect, and has an advantageous effect on the end disk.

[0013] According to another aspect, a stator for an electric drive machine in a motor vehicle is disclosed. The stator includes a laminated core having a plurality of winding slots and a plurality of axial cooling medium passages, the axial cooling medium passages being circumferentially arranged between the winding slots. The stator includes a stator winding head extending from each axial end of the winding slots on both sides of the laminated core. An end plate according to one aspect of the present invention is disposed on each side of the laminated core.

[0014] The present invention is based, inter alia, on the consideration that the end-side openings of the cooling passages near the grooves are unfavorably visible or aligned from the laminated core in several respects with respect to their position. The formation of spray holes in the outermost thin sheets (iron sheets) of the laminated core is very complicated and cannot be formed without electromagnetic losses. Similarly, as explained at the beginning, an automated trickle process is difficult to implement in a way that reliably prevents the openings from adhering. Spray nozzles drilled into the laminated core together adversely affect electromagnetic performance and thus shorten the effective length, resulting in a reduction in the stator's weight relative to its power output.

[0015] The invention is based, inter alia, on the idea that end plates, which are configured, for example, as cooling medium-carrying lamellae, are provided on both sides of the laminated core.

[0016] The problems described above for stators cooled by oil near the grooves are solved by end plates, for example, by directing the cooling medium flow radially outward to a larger radius so that it is delivered or sprayed to separate winding head cooling modules. This also prevents blockage of the axial passage openings during stator trickling, and any necessary masking for the openings can be easily provided, since the passage openings are no longer in the immediate vicinity of the trickling resin.

[0017] A possible material for the carrier plates is steel, for example, because it can be attached to the laminated core with a baking finish, just like the laminated core itself (iron plate). Additionally, a step in the housing can help the carrier plates fit the stator. The end plates can be configured so that they do not lead to a deterioration in the gap and leakage path between the copper (Cu) conductors of the winding head and the laminated core, and as a result, the dimensions of the winding head do not deteriorate despite the installation of the end plates.

[0018] Alternatively, for example, if simultaneous packaging of the carrier sheet with the remaining laminated core is no longer possible, dielectric synthetic resin materials (e.g., PA6 or PA12) are considered as materials. Such end plates can be formed in one piece when the radial oil passages are glued together before the stator is manufactured, or in multiple pieces when they are screwed onto the laminated core after the stator is manufactured. The synthetic resin end plates can have a high-temperature-resistant hard component for the carrier geometry and a high-temperature-resistant soft laminated core for the sealing surface against the laminated core, and can be manufactured using, for example, a multi-color (multi-component) injection molding method. They can be screwed onto countersunk bolts that do not protrude from the contours, for example.

[0019] According to one configuration, the radial guide recesses are particularly evenly spaced apart in accordance with the positioning of the coolant axial passages, so that the coolant can be guided axially outward directly from the axial end of each coolant axial passage.

[0020] According to one configuration, one common coolant outlet is assigned to each radial guide recess or to each of two or more radial guide recesses. In a first alternative configuration, the coolant flowing through a given coolant axial passage can cool an assigned portion of the winding head at a corresponding circumferential position. In a second alternative configuration, the coolant can be effectively ejected even under adverse pressure conditions because fewer outlets need to be operated. A separate coolant outlet per axial passage would require a very high pumping pressure, reducing the machine's efficiency. If the pressure remained the same, only droplets would exit the holes and enter the air gap. For this reason, the number of openings must be reduced. To make matters worse, the smaller the drilling holes, the shorter the drilling tool's lifespan. Many small holes must be balanced against fewer, and therefore larger, holes.

[0021] According to one embodiment, the coolant outlets are configured as spray nozzles, particularly for wetting the winding head with the coolant and / or directed towards the winding head. In this configuration, the winding head can already be fully sprayed or wetted with the coolant due to a suitable configuration of the coolant outlet(s). In this case, the oil passages on the laminated core side can be guided to only one collection volume or to several collection volumes (the number of which is less than the number of oil passages).

[0022] According to an alternative configuration, the coolant outlet is configured as a coolant connection to a winding head cooling module configured for a proper distribution of the coolant to the winding head, in which case a further coolant guide is provided downstream of the end plate, in particular downstream of the coolant outlet, which coolant guide is configured so that the end head can be optimally or optionally wetted with the coolant.

[0023] According to one configuration, the cooling medium outlets arranged further down at the mounting location of the stator are formed with a smaller cross section than the cooling medium outlets arranged further up, which makes it possible to compensate for the effect of gravity on the distribution of the cooling medium at the individual cooling medium outlets and / or the fact that in some cases the upper part of the winding head is cooled only by the cooling medium injected therein, while the lower part of the winding head can be additionally cooled by the cooling medium coming from the upper part.

[0024] According to one embodiment, the end plate comprises a steel material, in particular the end plate is formed of a steel material, and in particular the end plate is provided with a dielectric layer that completely surrounds the contour of the end plate or only on the winding head side.

[0025] According to an alternative configuration, the end plates are made of at least one, particularly dielectric, synthetic resin material. This allows them to be arranged axially between the lamination cores and the winding heads, particularly at the teeth between the grooves, without air gaps or leakage path problems. An axial extension of the stator is not necessary for this purpose. Furthermore, according to a suitable configuration, the end plates can even contribute to the electrical insulation of the lamination cores and the central head from each other, potentially even allowing for an axial shortening of the stator.

[0026] In particular, the end plates are formed as multi-component parts with hard components for forming the radial guide recesses and the ring contours and soft components for forming the sealing surfaces for the laminated cores, so that end plates that meet both the structural requirements and the sealing requirements for the coolant guides can be manufactured in a manner known per se and therefore simple and convenient.

[0027] According to one embodiment, a number of seals formed around one or more radial guide recesses spaced apart in the circumferential direction of the ring contour are provided as particularly soft components, which allows a simpler and more reliable seal to be produced than with a single seal extending along the circumference of a common ring contour.

[0028] According to one embodiment, at least one recess is also arranged circumferentially between the two radial guide recesses, so that the radial guide recess is defined by the remaining web, in the extension of which the end plate has the entire ring wall thickness, allowing the end plate to be made with as little dead weight as possible.

[0029] According to one embodiment, the end plate is formed from two or more, in particular six, identically formed peripheral sections, which are arranged in a circumferential direction around the end plate. Multi-part end plates can be more easily identified, in particular after the windings have been inserted into the winding grooves. This ensures optimal cooling of both winding heads and allows for undercut-type positioning of the sections between the conductor paths, for example, after the windings have been installed.

[0030] According to one configuration, the end plates are baked onto the laminated core completely or in an application-specific manner with sufficient cooling medium tightness using baking varnish, particularly in a baking process carried out together with the baking of the laminated core's thin plates (iron plates). Additionally or alternatively, the trickle process can be configured so that the trickle resin itself also contributes to the system's sealing. This makes it possible to take advantage of the capillary action of the individual, minimally spaced thin plates (iron plates), since trickle resin is used in any case where necessary for this, depending on the system. Thus, the stator can be manufactured particularly easily with particularly few steps.

[0031] According to an alternative configuration, the radial guide recesses are defined on the stack core side of the end plates by elastic synthetic resin components that are clamped, in particular screwed, to the stack core so that each radial guide recess and its associated side define the radial guide section in a coolant-tight manner. In this way, the end plates can be manufactured entirely from dielectric synthetic resin, for example as two-component injection molded parts, so that the stator can be optimized electromagnetically and, if necessary, also with regard to its axial extension.

[0032] One possibility for mounting the stator is to use a hairpin twist method.

[0033] The hairpin twisting method (also known as hairpin process chain) is an indirect method for the production of windings, especially for stators of drive machines. Due to their large conductor cross-section, the hairpins are already adapted in their geometry to the mounting process for the installation of plug-in coils on the laminated core. In contrast to conventional stator production (with its winding-based mounting method), a deformation-based mounting method is used. A typical hairpin process chain usually comprises several higher-level process steps:

[0034] (i) Hairpin manufacturing: Here, typically already painted flat copper wire is continuously unwound (unrolled) and possibly straightened in multiple steps to reduce residual curves and internal stresses. After the straightening process, the hairpin wire is partially stripped using a laser or mechanical method, since the copper ends of the individual hairpins are usually welded together in a later process step. Depending on the desired hairpin geometry, the hairpin wire is cut to a desired length using a cutting process and bent. Here, the sequence of the bending and cutting to a desired length operations can be changed. The hairpin is then deformed into the desired, possibly three-dimensional, geometric shape. The process can be performed in a single step using special CNC bending equipment or in multiple steps using die bending and rotary bending.

[0035] (ii) Mounting and twisting: Because direct mounting of hairpins onto the lamination core is limited by the overlap of the winding head geometry and because reliable insertion into the stator assembly is required, hairpins are often pre-mounted in so-called mounting assemblies. The arrangement of the individual pins in the pre-mounting depends on the winding pattern. Typically, a hairpin stator has at least three, and often up to 21 or more, different hairpin geometries. Parallel to the pre-mounting, insulating paper is inserted into the stator grooves. This helps to separate the winding system from the earth potential of the lamination core. After the hairpins are fully pre-mounted, the entire hairpin basket (also called a hairpin cage) is axially inserted into the lamination core using a multi-gripper system. The hairpins are partially chamfered during the cutting process to any length with very tight tolerances, and positioning brackets are used if necessary. The hairpin ends are intertwined with each other at different positions depending on the winding pattern. This process is also called the twisting process. In addition to the rotational movement, an axial movement of the installation tool is also performed. To ensure axial access to the interlacing tool, the hairpin ends must be radially released (exposed) in a preparation step. The critical point for the subsequent manufacturing step of twisting is the start of the wire bending, viewed axially from the end face of the laminated core. If bent too quickly, the groove insulation paper may tear, leading to air gaps and leak paths, and damage may be expected. To initiate the bend radius at the correct point, a collar protection finger is provided radially, and the bend is initiated at its shoulder.

[0036] For this reason, so-called collar guard fingers are used during hairpin twisting, which ensure that the correct twist radius is initiated radially between the conductors at the correct point of each hairpin. These collar guard fingers are configured differently depending on the installation provider, but in use they integrate radial placement and axial support of bending forces into the laminated core.

[0037] (iii) Welding and wiring: Adjacent hairpin ends are brought into contact with one another according to the wiring diagram. Laser welding is usually used for this purpose, which melts the hairpin ends and bonds them together in a material-bonding manner (welding). During the welding process, attention should be paid to a uniform weld seam geometry and to minimizing the heat input into the hairpin. Achieving a consistent initial welding condition poses a particular challenge, so that a reproducible welding strategy can be pursued. Vertical and lateral misalignments of the hairpin ends relative to one another can lead to welding errors. To counter this, local compensation processes are used, depending on the tolerances of the preceding process.

[0038] (iv) Rendering of hairpin stator: Subsequently, wiring elements such as contact rings, connection plugs, connection terminals or jumpers are connected to the welded hairpin ends to realize the phase jump and winding connection, a process that is often also carried out by a laser welding process.

[0039] Secondary insulation: After wiring, the final step is to insulate the welded copper ends and, if necessary, to impregnate (coat) the stator. Insulating the copper ends is often done by powder coating or by applying a casting resin, for example, based on polyurethane. For casting, the impregnation, trickle or full casting process is typically used. Impregnation can be carried out in the same way as the impregnation process used in the manufacture of conventional wound stators. Impregnation contributes to protection against thermal, electrical, environmental and mechanical influences. In many cases, the immersion or trickle method is also used for impregnation.

[0040] In the hairpin twist method, protrusions on the end faces of the laminated core that exceed the magnetically effective length deteriorate operability during manufacturing and interfere with the hairpin twist process.

[0041] According to one configuration, the collar protection fingers are formed in the end plates, in particular integrally therewith, and solve the manufacturing problems during twisting by means of, for example, deep-drawn geometries held in the stator, which are included on the end face sides of the laminated cores, similar to the collar protection fingers.

[0042] According to one design, the part that guides the cooling medium is manufactured in a two-component injection molding process, so that the twisting leads to axial compression with the laminated core, which ensures leak-tightness of the cooling medium. The challenge in designing the seal is to take into account, on the one hand, the springback of the wire after twisting and, on the other hand, the thermal expansion of the different materials used.

[0043] According to one configuration, the geometrically shaped cooling medium guiding portion is configured so that the passages on the laminated core side merge at an appropriate position so that they can be guided further radially outward again in the direction of the winding head.

[0044] According to one configuration, the geometry is configured to avoid a deterioration in the air gap and leakage path between the copper (Cu) conductors on the one hand and the laminated core on the other hand, thereby avoiding a deterioration in the winding head dimensions.

[0045] According to one embodiment, the end plate has a collar guard finger in the peripheral region of one, several, or all of the radial guide recesses, in particular at the peripheral position, which collar guard finger extends radially inward, in particular from the ring contour, in particular from the radial position of one or more of the cooling medium axial passages. In other words, according to one embodiment, the end plate has a collar guard finger in the peripheral position of each winding groove, in particular from the ring contour, which collar guard finger extends radially along part or the entire radial extension of the stator winding groove. The collar guard finger is used during hairpin twisting, and ensures that the correct twist radius is initiated radially between the conductors at the correct point of each hairpin.

[0046] According to one configuration, one or more collar protection fingers are made of the material of the hard component of a two-color (two-component) injection-molded part. This allows the end plate to be axially compressed with the laminated core during twisting, ensuring oil leakage resistance. The hairpin section is pulled slightly further toward the switch ring during the twisting process, suppressing side A. Therefore, different shapes of the collar support finger contours on sides A and B of the star ring are also set.

[0047] The profile on side A has a shape that already takes into consideration the mechanical forming of the hairpin roof part, while the profile on side B takes into consideration the twisting process.

[0048] According to one configuration, one or more collar guard fingers are arranged in the axial region of the ring wall thickness. Geometrically integrated collar guard fingers solve manufacturing problems during twisting by virtue of the same geometry as the collar guard fingers held to the stator.

[0049] According to one embodiment, the collar protection finger or fingers each have a support projection which, on the winding head side, extends beyond the axial extension of the ring contour with respect to the central axis of the circular contour of the end plate, so that the hairpin can be twisted at a set distance from the laminated core, in particular without damaging the groove insulation paper.

[0050] According to one configuration, the support projection has a rounded roof-like support surface, which extends in particular in the radial direction and / or covers part of an imaginary plane of the ring contour, so that the hairpin can be bent on the support surface and / or supported after being bent.

[0051] Further advantages and applicability of the present invention will become apparent from the following description taken in conjunction with the drawings. [Brief explanation of the drawings]

[0052] [Figure 1] 1A and 1B are diagrams illustrating a stator having two end plates according to a first exemplary configuration of the present invention. [Figure 2] FIG. 2 is a diagram showing a part of the stator of FIG. [Figure 3] 2 is a partially cut-away view of one of the end plates of the stator of FIG. 1. FIG. [Figure 4] FIG. 2 is a cross-sectional view of the stator of FIG. [Figure 5] FIG. 2 shows the stator of FIG. 1 without windings. [Figure 6A] 2 is a view showing the winding head side of one of the end plates of the stator in FIG. 1. FIG. [Figure 6B] 2 is a view showing one of the end plates of the stator in FIG. 1 on the side of a laminated core. [Figure 7] 10A-10C illustrate a portion of an alternative exemplary second configuration of an end plate usable in the stator of FIG. 1 having a plurality of longer collar support fingers and a peripheral seal formed as an elastomeric seal. [Figure 8] 8A shows the laminated core side and FIG. 8B shows the winding head side of an alternative end plate according to FIG. 7. FIG. [Figure 9] 10A-10C are side views of two different end plates according to an exemplary third configuration of the present invention (on the "A" side of the electric drive machine) or an exemplary fourth configuration of the present invention (on the "B" side of the electric drive machine). [Figure 10] 10 is a perspective view of the stator of FIG. 9 from the "B" side. FIG. [Figure 11] FIG. 10 is a perspective front view of an end plate according to a third exemplary configuration of the present invention (on side "A" of the electric drive machine). [Figure 12] FIG. 10 is a front view of an end plate according to a third exemplary configuration of the present invention. [Figure 13a] 10A and 10B are diagrams illustrating the difference in the support protrusions of the end plates according to the third exemplary configuration and the fourth exemplary configuration. [Figure 13b] 10A and 10B are diagrams illustrating the difference in the support protrusions of the end plates according to the third exemplary configuration and the fourth exemplary configuration. [Figure 14] 10 is a rear view of an end plate according to a third exemplary configuration of the present invention, to the radial guide recesses and to the individual seals of the radial guide recesses formed as elastomeric seals. FIG. [Figure 15a] 15A and 15B show different views of the individually sealed radial guide recesses of the end plate according to FIG. 14. [Figure 15b] 15A and 15B show different views of the individually sealed radial guide recesses of the end plate according to FIG. 14. DETAILED DESCRIPTION OF THE INVENTION

[0053] 1 shows a stator 1 for an electric drive machine in a motor vehicle. The stator 1 includes a laminated core 2 having a plurality of winding slots 4 and a plurality of axial cooling medium passages 6, which are arranged between the winding slots 4 in the circumferential direction U. The stator 1 includes a stator winding head 8.1 or 8.2 on each side of the laminated core 2, each extending from an axial end of the winding slot. An end plate 10 according to one aspect of the present invention is arranged on each side of the laminated core 2.

[0054] Each of the end plates 10 has a ring contour 12 with a ring wall thickness X_R, which extends between the laminated core side P and the winding head side D of the end plate 10 .

[0055] The end plate 10 also has a plurality of radial guide recesses 14 spaced apart in the circumferential direction U on the laminated core side P, which cooperate with the side wall of the outer thin plate (iron plate) of the laminated core 2 to guide the cooling medium flow F from the cooling medium axial passage 6 of the laminated core 2, which is arranged further inward in the radial direction R of the stator 1, to the winding head side D, which is arranged further outward in the radial direction of the end plate 10, and ultimately to the cooling medium outlet 18 directed toward the stator winding head 8.1 or 8.2, respectively.

[0056] The geometry and function of the end plate 10 in general, and of the radial guide recesses 14 in particular, can be better seen in particular from Figures 3, 4 and 6B.

[0057] By guiding the cooling medium radially outward in the end plates, it is possible to ensure that the entire winding head is wetted from the radial outside, also in the axial cooling medium passages near the grooves.

[0058] It can be seen from the enlarged portion of FIG. 1 in FIG. 2 that in this embodiment the radial guide recess 14 begins radially far enough inside that its radially inner end allows fixing and / or locking of the orientation of the end plate 10 in the circumferential direction U.

[0059] 1-6, a region of the end plate is already formed that extends radially inward, yet is not yet formed far enough radially inward to be used as a collar support finger 120 (see FIGS. 7 and 8) in a hairpin twist configuration. Other exemplary configurations of end plates 110 having such collar support fingers 120 are shown in FIGS. 7 and 8 and described in the associated figures.

[0060] Further features and advantages can be seen from different perspectives of the first exemplary configuration of the present invention in FIGS. 3, 4, 5 and 6. FIG.

[0061] The radial guide recesses 14 are arranged at peripheral positions of the coolant axial passages 6 and are correspondingly equally spaced apart from one another in the circumferential direction, so that the coolant can be guided axially outward directly from the axial end of each coolant axial passage.

[0062] In addition, a cooling medium outlet 18 is assigned to each radial guide recess 14, so that the cooling medium flowing through a given cooling medium axial passage can cool the assigned part of the winding head at the corresponding circumferential position.

[0063] In this embodiment, each cooling medium outlet 18 is configured to wet the winding head with cooling medium and is directed towards the winding head so that the cooling medium can be sprayed towards it.

[0064] In this embodiment, the end plate 10 is formed as a dielectric synthetic resin member and manufactured by a two-color (two-component) injection molding method. Here, a hard component made of heat-resistant synthetic resin is provided, which, together with the side surface of the outermost thin plate (iron plate) of the laminated core 2, defines the radial guide recess 14. In addition, another soft or elastic component made of heat-resistant synthetic resin is provided, which seals the contact surface between the end plate 10 and the laminated core 2.

[0065] This allows the end plates to be positioned axially between the laminated core 2 and the winding heads 8 without air gap and leakage path problems, and no axial extension of the stator 1 is required for this purpose.

[0066] 7 and 8 show different views of the end plate 110, which further includes fully formed collar support fingers 120. Additionally, the geometry of the radial guide recesses 114 and coolant outlets 118 differs from that of the other embodiments of FIGS. 1-6, although there is no fundamental functional difference between the two configurations in this respect.

[0067] The circumferential region of each radial guide recess 114 is provided with one collar support finger 120, which extends radially outward from the ring contour 12 further than the winding grooves 4 of the stator 1. The circumferential extension of the collar support fingers is formed in such a way that each finger 120 just covers the wide intermediate space between two winding grooves 4, so that the collar support fingers 120 can be used for optimal support of the hairpin bends.

[0068] The collar support fingers 120 are made of the material of the hard component of the two-color injection molding and are manufactured so that when twisted, axial compression occurs with the laminated core, thereby contributing to the prevention of leakage of the cooling medium. In the illustrated embodiment, for sealing purposes, one peripheral seal 115 is provided radially inside the radial guide recess 114 in the ring contour portion 12. The peripheral seal 115 is made of the material of the soft component of the two-color injection molding (especially an elastomer material).

[0069] FIG. 9 illustrates a stator 201 having a first end plate 210 according to the third exemplary configuration of the present invention on the "A" side of the electric drive machine and a second end plate 310 according to the fourth exemplary configuration of the present invention on the "B" side of the electric drive machine.

[0070] The collar support fingers 220 and 320 of both end plates 210 and 310 are provided with support protrusions 222 and 322, respectively, which extend over the axial extension of the ring contour 12 on the winding head side D. The support protrusions 222 and 322 are provided with rounded, roof-shaped support surfaces 224 and 226, respectively.

[0071] The end plates 210, 310 differ from one another in the longitudinal extension (along the longitudinal axis L) of each support projection 222 or 322 and in the configuration of the associated support surface 224 or 324, respectively. The differences in configuration and function can be seen in particular in detail in FIG. 13.

[0072] The hairpin section is pulled slightly further towards the switch ring during the twisting process, tightening the "A" side, which also results in different shapes of the collar support finger contours on the star ring on the "A" and "B" sides.

[0073] The "A" side profile already has a shaping that takes into account the mechanical shaping of the hairpin roof, so that the support protrusion 222 is axially longer with an axial extension L_A and the support surface 224 is roof-shaped and rounded so that the roof can be shaped and / or contacted at said support surface. The "B" side profile takes into account the twisting process, so that the support protrusion 322 is axially shorter with an axial extension L_B.

[0074] Figure 10 shows a perspective view of the stator 201 of Figure 9 looking towards the "B" side, which clearly shows that the coolant outlets 318 of the end plate 310 (as well as the coolant outlets 218 of the end plate 210 on the "A" side, which are not visible here) are formed as circular recesses and are relatively small to support high ejection pressures.

[0075] 11 shows the end plate 210 on side "A" of the electric drive machine in a front perspective view, so that in particular the collar support finger 220 with the support protrusion 222 and the shape of the support surface 224 can be clearly seen.

[0076] 12 shows the end plate in a front view, which clearly shows the radially outer corrugations of the ring contour 212, which contribute to reducing material at peripheral locations where no coolant guide is required.

[0077] 14 shows the end plate 210 in a rear view so that the radial guide recesses 214 can be seen. Each of the circumferentially spaced radial guide recesses 214 is formed to guide the coolant from two adjacent coolant axial passages to a coolant outlet 218 toward the radial guide recess 214 having a circumferentially arranged individual seal 215 formed therein, each individual seal 215 being formed solely for sealing the radial guide recess 214 and made of a softer sealing synthetic resin (e.g., in the sense of a 2K part (two-component part) made of elastomer synthetic resin).

[0078] 15a / b show the individually sealed radial guide recesses 214 of the end plate 210 according to FIG. 14 enlarged in different views. [Explanation of symbols]

[0079] 1,201 stators 2 Laminated core 4 Winding groove 6 Coolant axial passage 8.1, 8.2 Stator Winding Head 10,110,210,310 End Plate 12,212 Ring contour 14,114,214 Radial guide recess 16 Coolant axial passage 18,118,218,318 Coolant outlet 115 Perimeter Seal 120,220,320 Collar support fingers 215 Individual Seals 222,322 Support protrusion 224,324 Support surface A A side of the electric drive machine B Side B of the electric drive machine D Winding head side F Coolant flow P Laminated core side R Radial direction U circumferential direction X_R Ring Wall Thickness L_A,L_B Axial extension

Claims

1. An end plate (10, 110, 210, 310) for a laminated core (2) of a stator (1, 201) of an electric machine, comprising: a ring contour (12) extending between the laminated core side (P) and the 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; It is equipped with the radial guide recesses are configured to guide the cooling medium flow (F) from a cooling medium axial passage (16) of the laminated core arranged further inward in the radial direction (R) of the stator toward the winding head side (D) to a cooling medium outlet (18, 118, 218, 318) arranged further outward in the radial direction of the end plate.

2. 2. The end plate according to claim 1, wherein the radial guide recesses are spaced apart from one another in particular evenly, corresponding to the positioning of the cooling medium axial passages.

3. 3. The end plate according to claim 1, wherein one coolant outlet is assigned to each of the radial guide recesses or to two or more of the radial guide recesses in common.

4. 4. The end plate according to claim 1, wherein the coolant outlet is configured as an injection nozzle.

5. 5. The end plate according to claim 1, wherein the cooling medium outlets arranged further downward are formed with a smaller cross section than the cooling medium outlets arranged further upward.

6. An end plate according to any one of claims 1 to 5, characterized in that it comprises a steel material and / or at least one synthetic resin material.

7. 7. The end plate according to claim 1, wherein the end plate is formed as a multi-component part having a hard component forming the radial guide recess and the ring contour and one or more soft components forming a seal (115, 215) with the laminated core, in particular with a sealing surface.

8. An end plate according to any one of claims 1 to 7, characterized in that a plurality of seals (215) are provided around one or more radial guide recesses spaced apart from one another in the circumferential direction of the ring contour portion.

9. 9. An end plate according to any one of the preceding claims, characterized in that it is made up of two or more, in particular six, in particular identically formed peripheral portions.

10. An end plate according to any one of claims 1 to 9, characterized in that one, several or all of the radial guide recesses are each provided in the peripheral region with a collar support finger (120, 220, 320) extending radially inward.

11. 11. An end plate according to claim 1, characterized in that at the circumferential position of each winding groove, a collar support finger is provided, which extends along part or the entire radial extension of the winding groove (4) of the stator.

12. 12. An end plate according to claim 10 or 11, characterized in that the one or more collar support fingers are made from the material of a rigid component of a two-component injection molded part.

13. An end plate according to any one of claims 10 to 12, characterized in that the one or more collar support fingers are arranged in an axial region (X_R) of the radial guide recess (14).

14. An end plate according to any one of claims 10 to 13, characterized in that the one or more collar support fingers have support protrusions (222, 322) extending over the axial extension of the ring contour portion on the winding head side.

15. 15. An end plate according to claim 14, characterized in that the support projections are provided with rounded roof-like support surfaces (224, 324).

16. a laminated core (2) having a plurality of winding grooves (4) and a plurality of cooling medium axial passages (16) arranged between said winding grooves in the circumferential direction (U); - stator winding heads (8.1, 8.2) emerging from each axial end of the winding groove on either side of the laminated core; A stator (1, 201) for an electric drive machine in a motor vehicle, comprising: A stator, characterized in that one end plate (10, 110, 210, 310) according to any one of claims 1 to 15 is provided on each side of the laminated core.

17. 17. The stator according to claim 16, wherein the end plates are baked onto the laminated core in a coolant-tight manner using baking paint.

18. 17. A stator according to claim 16, characterized in that the radial guide recesses are defined on the lamination core side (P) of the end plates by elastic synthetic resin components and clamped to the lamination cores.

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