Rotor for an electric drive machine, method for manufacturing a rotor, drive machine with a rotor and motor vehicle with a drive machine

Abstract

The invention relates to a rotor (10) for an electric drive machine (100), with a rotor lamination stack (20) which has at least one rotor lamination stack groove (21, 22, 23, 24, 25, 26) and rotor windings (28) arranged therein, which are secured against an impermissible offset of the rotor windings (28) relative to the rotor lamination stack (20) by means of at least one slot wedge (30, 31, 32, 33, 34, 35) of the rotor (10) within the at least one rotor lamination stack groove (21, 22, 23, 24, 25, 26) by means of an impermissible offset of the rotor windings (28) relative to the rotor lamination stack (20).The at least one slot wedge (30, 31, 32, 33, 34, 35) is subjected to a compressive force (F_D) acting in the axial direction (A) of the rotor (10) by a clamping plate (36) of the rotor (10) at a first end face (11) of the rotor (10), and is thereby held in a deformation state (16) in which the at least one slot wedge (30, 31, 32, 33, 34, 35) has a greater extent in the radial direction (R) and / or in the circumferential direction (U) than in a ground state (14) of the at least one slot wedge (30, 31, 32, 33, 34, 35) and, as a result of the greater extent, a clamping force (F_K) pressing the rotor windings (28) against the rotor lamination stack (20) is exerted on the at least one The rotor windings (28) arranged in the rotor lamination slot (21, 22, 23, 24, 25, 26) exert force. Further aspects of the invention relate to an electric drive machine (100), a method for manufacturing a rotor (10), and a motor vehicle (K).

Description

The invention relates to a rotor for an electric drive motor, comprising a rotor lamination stack which has at least one rotor lamination stack slot and rotor windings arranged therein, which are secured against an impermissible misalignment of the rotor windings relative to the rotor lamination stack by means of at least one slot wedge of the rotor within the at least one rotor lamination stack slot. Further aspects of the invention relate to a method for manufacturing a rotor, a drive motor, and a motor vehicle. Resin is frequently used in the manufacture of electric drive motors to encapsulate individual rotor components, thereby giving the rotor, among other things, high strength during operation at high speeds. A problem with the use of resin is that unwanted wetting of sensitive components must be avoided, and it significantly complicates rotor recycling, or at best results in a low recycling rate. From DE 10 2008 037 544 A1, a rotor for an electric machine is known. The rotor includes a cavity with at least one contoured recess formed in a section thereof and a wedge comprising at least one contoured projection configured to mirror the at least one contoured recess of the cavity and configured to be positioned within the at least one contoured recess to assist in positioning the wedge within the cavity. The at least one contoured recess and the at least one contoured projection are shaped to minimize stresses in the rotor. DE 10 2020 110 664 A1 describes an electric machine comprising a rotor with a rotor body. The rotor body has several poles, each supporting at least one rotor winding formed from multiple conductor loops. The poles extend radially along the rotor, and the conductor loops run through slots formed between two adjacent poles. A radially extending support element is arranged in each slot between the rotor windings of the adjacent poles. This support element rests at a radially outer end of the slot against a fixed abutment element located radially between the adjacent poles. During rotation and / or heating of the rotor, the support element presses the conductor loops against the rotor body. The object of the present invention is to provide a sustainable rotor, a method for manufacturing such a rotor, an electric drive machine with such a rotor, and a motor vehicle. This problem is solved by a rotor with the features of claim 1, by a method with the features of claim 8, by a drive machine according to claim 9, and by a motor vehicle according to claim 10. Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims. A first aspect of the invention relates to a rotor for an electric drive machine, comprising a rotor lamination stack which has at least one rotor lamination stack slot and rotor windings arranged therein, which are secured against an impermissible misalignment of the rotor windings relative to the rotor lamination stack by means of at least one slot wedge of the rotor within the at least one rotor lamination stack slot. The electric drive machine can be designed as a so-called separately excited synchronous machine, abbreviated SSM or FSM, and configured as a traction machine, i.e., for driving a motor vehicle. According to the invention, it is provided that the at least one slot wedge is subjected to a pressure force acting in the axial direction of the rotor by a clamping plate of the rotor at a first end face of the rotor, and that the at least one slot wedge is thereby held in a deformation state in which the at least one slot wedge has a greater extent in the radial direction and / or in the circumferential direction than in a basic state of the at least one slot wedge and, as a result of the greater extent, exerts a clamping force on the rotor windings arranged in the at least one rotor lamination slot, pressing the rotor windings against the rotor lamination stack.This is advantageous because it allows for the fixing, and in particular the holding, of the rotor windings arranged in the at least one rotor lamination stack slot by applying mechanical force in the form of pressure on the at least one slot wedge in the axial direction of the rotor, without requiring a material bond, such as one created by potting the rotor with resin, between the rotor windings and the rotor lamination stack. In its deformed state, the at least one slot wedge can be widened in the radial direction R and additionally or alternatively in the circumferential direction U compared to its inert state, thereby being pressed positively and frictionally against the rotor windings. This allows the slot wedge to act as a clamping wedge in the rotor lamination stack slot, holding the rotor windings in place. The slot wedge can also be designed as a cover slide and / or be referred to as a cover slide.The groove wedge can, for example, be made at least partially or entirely of polyurethane, or section by section of different polyurethanes. The clamping plate can be designed as a clamping disc, which may have a circular outer contour. The invention is based on the understanding that deformation, particularly elastic deformation, of the slot wedge enables its easy disassembly, thus simplifying the recycling of the rotor. By using the slot wedge, the rotor can be manufactured in a particularly sustainable way and recycled with minimal effort, as the use of resin in its production can be eliminated. In an advantageous embodiment of the invention, the at least one slot wedge has at least one through-opening through which at least one screw element of the rotor is passed to exert the compressive force on the clamping plate. This facilitates the application of the compressive force and enables its uniform distribution on the slot wedge, allowing its uniform deformation from the initial state to the deformed state. The screw element can extend over the entire length of the rotor in the axial direction and exert the compressive force on the slot wedge at the opposing end faces (first end face, second end face) of the rotor. In a further advantageous embodiment of the invention, the rotor has a second clamping plate on a second end face opposite the clamping plate in the axial direction, and the at least one slot wedge is clamped in the axial direction between the clamping plate and the second clamping plate. This enables a particularly homogeneous distribution of the pressure force on the slot wedge, which allows it to be deformed particularly uniformly and to hold the rotor windings in the rotor lamination core slot under correspondingly uniform application of the clamping force. In a further advantageous embodiment of the invention, the at least one wedge-shaped slot in its basic state has a greater axial extent than the at least one rotor lamination stack slot, and / or the clamping plate has at least one projection, projecting at least partially axially into the at least one rotor lamination stack slot, over which the compressive force is exerted on the at least one wedge-shaped slot. If the at least one wedge-shaped slot in its basic state has a greater axial extent than the at least one rotor lamination stack slot, the at least one wedge-shaped slot can be deformed particularly strongly under the compressive force in the circumferential and / or radial direction, resulting in a correspondingly greater clamping force and a correspondingly more durable fixation of the rotor windings in the at least one rotor lamination stack slot. Additionally or alternatively, the clamping plate's at least one projection allows the clamping force to be applied even within the at least one rotor lamination core groove. In other words, the clamping plate applies the clamping force within the at least one rotor lamination core groove, and not only to an edge region of the groove, as would be the case with a clamping plate designed as a particularly easy-to-manufacture, flat disk. Preferably, the at least one projection can be formed or adapted to a cross-section of the rotor lamination core groove oriented perpendicular to the axial direction. This prevents the at least one groove wedge from being forced past the projection and the windings in a direction opposite to the force's action when the clamping force is applied, which could lead to an unfavorable reduction in the clamping force. In a further advantageous embodiment of the invention, the at least one wedge slot at at least one first wedge slot end of two wedge slots opposite each other in the axial direction exhibits greater stiffness against deformation than in a wedge slot region arranged between the opposing wedge slots. This advantageously results in the wedge slot undergoing particularly strong deformation in the wedge slot region between the opposing wedge slots during its transition from the inert state to the deformation state. This enables a uniform distribution of the clamping force over the axially dimensioned slot length of the rotor lamination stack slot onto the rotor windings. The wedge slot region can preferably correspond to a central region of the wedge slot. In a further advantageous embodiment of the invention, the at least one slot wedge is designed in multiple parts. This allows for a particularly efficient adjustment of the clamping force by adding or removing a portion of the at least one slot wedge from the at least one rotor lamination stack slot as required before the pressure force is applied. In a further advantageous embodiment of the invention, the at least one wedge slot has at least one first wedge slot portion made of a different material than a second wedge slot portion of the at least one wedge slot. This advantageously enables a particularly precise adjustment of the clamping force along the axial direction within the rotor lamination stack slot. For example, the first wedge slot portion of the at least one wedge slot, located in the region of the end face of the at least one rotor lamination stack slot, can be configured with a first compressive stiffness, and this first wedge slot portion can adjoin the second wedge slot portion, which is located further within the rotor lamination stack slot, particularly in the axial direction, and which can have a second compressive stiffness that is lower than the first compressive stiffness.This allows the second wedge section to deform more than the first when pressure is applied, resulting in a particularly precise clamping effect. At least one wedge section can be made of polyurethane (PU), at least partially. The different wedge sections can also be made of different polyurethane types. A second aspect of the invention relates to a method for manufacturing a rotor according to the first aspect of the invention, in which the compressive strength of a slot wedge material of the at least one slot wedge is reduced at least regionally by the application of heat before or during the application of the compressive force to the at least one slot wedge in its arrangement in the at least one rotor lamination stack slot and thereby brought into a state of deformation. The application of heat allows for a particularly targeted deformation of the at least one slot wedge. For example, the heat can be applied in the axial direction in the center of the at least one slot wedge during or before its arrangement in the at least one rotor lamination stack slot. The application of heat allows the at least one slot wedge to be selectively softened regionally, thereby simplifying the deformation of the slot wedge in those regions. A third aspect of the invention relates to an electric drive motor for a motor vehicle, with a rotor according to the first aspect of the invention or with a rotor manufactured according to a method according to the second aspect of the invention. This electric drive motor, which is particularly easy to recycle and therefore sustainable, can also be referred to as an electric drive motor. A fourth aspect of the invention relates to a motor vehicle with a sustainably designed drive engine according to the third aspect of the invention. The preferred embodiments and their advantages presented with respect to one of the aspects apply accordingly to the other aspects of the invention and vice versa. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the figure description and / or shown in the figures alone, can be used not only in the combination specified in each case, but also in other combinations or on their own, without leaving the scope of the invention. Further advantages, features and details of the invention will become apparent from the claims, the following description of preferred embodiments and the drawings. The invention is explained below again with reference to a specific embodiment. Figure 1 shows an abstract representation of a motor vehicle with an electric drive motor, the rotor of which is shown partially in a schematic perspective view; Figure 2 shows a schematic perspective view of one of six slot wedges of the rotor in a basic state; Figure 3 shows a schematic perspective view of a clamping plate of the rotor, which is designed to exert a compressive force on the slot wedges arranged in the respective rotor lamination stack slots together with a second clamping plate; and Figure 4 shows a screw element of six screw elements, each designed as a tie rod and serving to exert the compressive force via the clamping plates on the slot wedges in their arrangement in the respective rotor lamination stack slots. → n screw elements (4 / 6 / 8) Fig. 1 shows an abstract representation of a motor vehicle K with an electric drive motor 100, also shown abstractly. The drive motor 100 comprises a rotor 10, partially shown in a schematic perspective view in Fig. 1, as well as other components, such as a stator, which is not shown here. The stator can surround the rotor 10 at least in its circumferential direction U, i.e., be arranged further outwards in the radial direction R of the rotor 10 than the rotor 10 and extend along an axial direction A of the rotor 10. The axial direction A, the radial direction R, and the circumferential direction U are indicated in Fig. 1 by double arrows. The rotor 10 has a rotor lamination stack 20, which can be composed of a plurality of rotor laminations arranged in series, though not shown individually. The rotor 10 has six rotor lamination stack grooves 21, 22, 23, 24, 25, 26, which extend through the rotor lamination stack 20 in the axial direction A and in which rotor windings 28 of the rotor 10 extend. The rotor windings 28 are preferably copper wire windings. The rotor lamination stack 20 extends radially R outside a rotor shaft 13 of the rotor 10 and circumferentially U around this shaft. The rotor lamination stack 20 is rotationally fixed to this rotor shaft 13. In each of the rotor lamination stack slots 21, 22, 23, 24, 25, 26, one of a total of six slot wedges 30, 31, 32, 33, 34, 35 of the rotor 10 is arranged. Fig. 1 shows the individual slot wedges 30, 31, 32, 33, 34, 35 in their respective arrangement in the respective rotor lamination stack slots 21, 22, 23, 24, 25, 26, which is why the path of the rotor windings 28 within the rotor lamination stack slots 21, 22, 23, 24, 25, 26 is concealed by the slot wedges 30, 31, 32, 33, 34, 35. For this reason, only the winding heads with the rotor windings 28 formed on the end face of the rotor lamination stack 20 can be seen in Fig. 1. The rotor windings 28 are secured against impermissible misalignment, in particular misalignment in the radial direction R and circumferential direction U, of the rotor windings 28 relative to the rotor lamination stack 20 by means of the slot wedges 30, 31, 32, 33, 34, 35 of the rotor 10 within the respective rotor lamination stack slots 21, 22, 23, 24, 25, 26. Such misalignment can occur, for example, during strong changes in the acceleration of the rotor 10 or at high rotational speeds of the rotor 10. This can occur particularly if the windings 28 are not sufficiently secured against misalignment and the electric drive motor 100 is propelling the vehicle K with high acceleration or maintaining it at a high speed. To facilitate simplified recycling of the rotor 10, and thus of the electric drive motor 100 and ultimately of the motor vehicle K, the rotor 10 is not coated with resin during its manufacture, i.e., it is not subjected to a potting process in which resin is used as a potting compound. Instead, the rotor 10 is designed to be particularly durable in that the keyways 30, 31, 32, 33, 34, 35 are not potted, but are subjected to a compressive force F_D acting in the axial direction A of the rotor by a clamping plate 36 of the rotor 10 at a first end face 11 of the rotor 10, and the keyways 30, 31, 32, 33, 34, 35 are thereby held in a respective deformation state 16.In this deformation state 16, the respective slot wedges 30, 31, 32, 33, 34, 35 exhibit a greater extent in the radial direction R and additionally or alternatively in the circumferential direction U than in a basic state 14 of the slot wedges 30, 31, 32, 33, 34, 35. In the basic state 14, the slot wedges 30, 31, 32, 33, 34, 35 are unloaded; therefore, the compressive force F_D does not act on the slot wedges 30, 31, 32, 33, 34, 35 in the basic state 14. As a result of the greater extent, the slot wedges 30, 31, 32, 33, 34, 35 exert a clamping force F_K in their deformation state, pressing the rotor windings 28 against the rotor lamination stack 20. the clamping force F_K is applied to the rotor windings 28 arranged in the respective rotor lamination slots 21, 22, 23, 24, 25, 26. The clamping force F_K is sufficiently large that the use of resin to fix the windings 28 and prevent their misalignment is unnecessary.The rotor 10 can therefore be manufactured with very little or even no resin, making the rotor 10 particularly sustainable overall, especially since the slot wedges 30, 31, 32, 33, 34, 35 can be returned from their deformed state 16 to their original state 14 in a recycling process during disassembly of the rotor 10 by removing the pressure force F_D. In this process, the slot wedges 30, 31, 32, 33, 34, 35 are released, which reduces the clamping force F_K and allows the slot wedges 30, 31, 32, 33, 34, 35 to be removed from the respective rotor lamination slots 21, 22, 23, 24, 25, 26 without leaving any residue and with minimal effort – especially compared to conventional, encapsulated rotors. It is clear that during a transition from deformation state 16 back to the ground state 14, at least partial plastic deformation of the respective groove wedges 30, 31, 32, 33, 34, 35 may remain, similar to what occurs, for example, with a pressed-in plastic seal. If such a seal is removed after a certain period of time, corresponding traces of wear in the form of plastic deformations may remain on the seal. A similar situation can arise when the groove wedges 30, 31, 32, 33, 34, 35 are removed. Fig. 2 shows, as a representative example of all the slot wedges 30, 31, 32, 33, 34, 35, the isolated, removed slot wedge 30 in its basic state 14. It can be seen that the slot wedges 30, 31, 32, 33, 34, 35 each have a through-opening 40 through which a screw element 42 of the rotor 10, shown by way of example and isolated in Fig. 4, is passed to exert the compressive force F_D on the clamping plate 36. In addition to the clamping plate 36, the rotor 10 has a second clamping plate 38 on a second end face 12 opposite the clamping plate 36 in the axial direction A. To avoid obscuring the arrangement of the slot wedges 30, 31, 32, 33, 34, 35 in the respective rotor lamination stack grooves 21, 22, 23, 24, 25, 26, and for the sake of clarity, the clamping plate 36 is omitted in Fig. 1. However, in the assembled rotor 10, the slot wedges 30, 31, 32, 33, 34, 35 are clamped in the axial direction A between the clamping plate 36 and the second clamping plate 38, even though the clamping plate 36 is missing in Fig. 1, and are thus held in their respective deformation state 16. In order to transfer the compressive force F_D via the two clamping plates 36, 38 to the slot wedges 30, 31, 32, 33, 34, 35 and thereby maintain them in their deformation state 16, the two clamping plates 36, 38 each have clamping plate through-openings 39, the number of which per clamping plate 36, 38 corresponds to the number of slot wedges 30, 31, 32, 33, 34, 35. Thus, in this case, each clamping plate 36, 38 has six clamping plate through-openings 39.Each of the six screw elements 42 is passed through a clamping plate through-opening 39 in each clamping plate 36, 38 and through a through-opening 40 in each clamping plate, and screwed in place, so that each of the screw elements 42, which are designed as tie rods, passes through both clamping plates 36, 38 and through one of the slot wedges 30, 31, 32, 33, 34, 35. The screwing of the six screw elements 42 allows for a particularly uniform application of the compressive force F_D to the slot wedges 30, 31, 32, 33, 34, 35, since the slot wedges 30, 31, 32, 33, 34, 35 are held fixed in the axial direction A between the two clamping plates 36, 38. The slot wedges 30, 31, 32, 33, 34, 35, in their respective basic state 14, have a greater extent in axial direction A than the rotor lamination stack slots 21, 22, 23, 24, 25, 26. When the slot wedges 30, 31, 32, 33, 34, 35, in their basic state 14, are inserted into the respective rotor lamination stack slots 21, 22, 23, 24, 25, 26 during the assembly of the rotor 10, the slot wedges 30, 31, 32, 33, 34, 35 initially project beyond the rotor lamination stack slots 21, 22, 23, 24, 25, 26 in axial direction A. Only when screwed together using the clamping plates do they extend further. 36, 38 the groove wedges 30, 31, 32, 33, 34, 35 are compressed as they are transformed from their initial state 14 to the deformation state 16. During compression or...When transitioning from the ground state 14 to the deformation state 16, a slot wedge material is displaced, i.e., a material from which the slot wedges 30, 31, 32, 33, 34, 35 are made in the radial extension direction R and in the circumferential direction U, whereby the slot wedges 30, 31, 32, 33, 34, 35 exert the clamping force F_K on the rotor windings 28 in the respective rotor lamination stack slots 21, 22, 23, 24, 25, 26. Additionally or alternatively, both clamping plates 36, 38 have respective projections 37 by means of which a particularly high amount of the compressive force F_D can be exerted on the respective keyways 30, 31, 32, 33, 34, 35, and consequently a particularly high clamping force F_K can be achieved. Each of the clamping plates 36, 38 can have one projection 37 for each keyway 30, 31, 32, 33, 34, 35, so that in the present example, six projections 37 can be provided per clamping plate 36, 38. Fig. 3 shows, by way of example and for the sake of clarity, only a single projection 37. Each of the projections 37 can be inserted into one of the rotor lamination stack grooves 21, 22, 23, 24, 25, 26 when positioning the clamping plates 36, 38 during the assembly of the rotor 10 in the axial extension direction A, so that one projection 37 per clamping plate 36, 38 projects into one rotor lamination stack groove 21, 22, 23, 24, 25, 26.If both clamping plates 36, 38 are properly mounted, a total of two projections 37 extend opposite each other in the axial direction A into each of the rotor lamination stack grooves 21, 22, 23, 24, 25, 26. The pressure force F_D can be exerted on the respective slot wedges 30, 31, 32, 33, 34, 35 within the rotor lamination stack grooves 21, 22, 23, 24, 25, 26 via the projections, or even into the rotor lamination stack grooves 21, 22, 23, 24, 25, 26. When looking together at Fig. 1 and Fig. 3, it can be seen that a respective outer contour of the respective projections 37 can be adapted to a cross-section of the respective rotor lamination stack slots 21, 22, 23, 24, 25, 26 running perpendicular to the axial direction A, taking into account the rotor windings 28 running therein, which prevents the respective slot wedge 30, 31, 32, 33, 34, 35 from being pushed or squeezed past the respective projection 37 or between the projection 37 and the adjacent rotor windings 28 when the pressure force F_D is applied in the axial direction A, which leads to a reduced clamping force F_K. The wedges 30, 31, 32, 33, 34, 35 can exhibit greater stiffness against deformation at a respective first wedge end 44 of two wedge ends 44, 46 of the respective wedge 30, 31, 32, 33, 34, 35 that are opposite each other in the axial direction A than in a wedge section 45 arranged between the opposing wedge ends 44, 46. The wedge ends 44, 46 and the wedge section 45 are shown by way of example in Fig. 2 with respect to the isolated wedge 30. The wedge section 45 can correspond to a central region of the wedge 30. Fig. 2 also shows that the groove wedges 30, 31, 32, 33, 34, 35 can each be formed in multiple parts and that the groove wedges 30, 31, 32, 33, 34, 35 can each have a first groove wedge part 48 which is made of a different material than a second groove wedge part 50 of the respective groove wedge 30, 31, 32, 33, 34, 35.For example, the groove wedge parts 48, 50 can be formed on different plastics. As shown in Fig. 2, the respective groove wedge 30, 31, 32, 33, 34, 35 can also, for example, comprise two identical first groove wedge parts 48, between which the second groove wedge part 50 can be arranged in the axial direction A. To achieve a particularly targeted deformation, in a process for manufacturing the rotor 10, the compressive strength of a slot wedge material of the respective slot wedge 30, 31, 32, 33, 34, 35 can be reduced, at least in certain areas, by the application of heat before or during the application of the compressive force F_D to this slot wedge 30, 31, 32, 33, 34, 35 in its arrangement in the corresponding rotor lamination stack groove 21, 22, 23, 24, 25, 26, and thereby brought into the deformation state 16. The heat can be applied, for example, in an oven into which the slot wedges 30, 31, 32, 33, 34, 35 are placed. In summary, the invention allows the rotor 10 to be designed without potting, in particular without resin. For example, the invention eliminates the need for a complex plastic potting process, which leads to poor recyclability of the rotor 10, in order to provide the rotor 10 and / or the rotor windings 28 with the necessary stability against misalignment. Instead, the invention relies on a sustainable concept in which the compressive force F_D is exerted on the slot wedges 30, 31, 32, 33, 34, 35 by means of the clamping plates 36, 38, also referred to as clamping discs, while the slot wedges 30, 31, 32, 33, 34, 35 are located in their respective arrangements in the rotor lamination slots 21, 22, 23, 24, 25, 26. By applying the pressure force F_D, a targeted deformation of the slot wedges 30, 31, 32, 33, 34, 35 is caused, whereby they are displaced and surrounding components, such as the rotor windings 28, are supported by applying the clamping force F_K.The compressive force F_D is distributed via the clamping plates 36, 38 to the slot wedges 30, 31, 32, 33, 34, 35. The rotor 10 wound with the rotor windings 28, in particular an SSM rotor, can have star disks, the rotor lamination stack 20, support rings and the clamping plates 36, 38 which together with the slot wedges 30, 31, 32, 33, 34, 35, also referred to as deck slides, can be screwed and clamped by means of the screw elements 42 (here: tie rods). Reference symbol list 10 Rotor 11 First end face 12 Second end face 13 Rotor shaft 14 Normal state 16 Deformation state 20 Rotor lamination stack 21 Rotor lamination stack groove 22 Rotor lamination stack groove 23 Rotor lamination stack groove 24 Rotor lamination stack groove 25 Rotor lamination stack groove 26 Rotor lamination stack groove 28 Rotor winding 30 Wedge 31 Wedge 32 Wedge 33 Wedge 34 Wedge 35 Wedge 36 Clamping plate 37 Projection 38 Second clamping plate 39 Clamping plate through-hole 40 Through-hole 42 Screw element 44 First wedge end 45 Wedge area 46 First wedge end 48 First wedge part 50 Second wedge part 100 Electric drive motor A Axial direction F_D Compressive force F_K Clamping force K Motor vehicle R Radial direction U Circumferential direction QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature DE 10 2008 037 544 A1

[0003] DE 10 2020 110 664 A1

[0004]

Claims

Rotor (10) for an electric drive machine (100), comprising a rotor lamination stack (20) which has at least one rotor lamination stack slot (21, 22, 23, 24, 25, 26) and rotor windings (28) arranged therein, which are secured within the at least one rotor lamination stack slot (21, 22, 23, 24, 25, 26) against an impermissible misalignment of the rotor windings (28) relative to the rotor lamination stack (20) by means of at least one slot wedge (30, 31, 32, 33, 34, 35) of the rotor (10), characterized in that the at least one slot wedge (30, 31, 32, 33, 34, 35) is secured by a clamping plate (36) of the rotor (10) on a first end face (11) of the rotor (10), with an axial extension direction (A) is subjected to the pressure force (F_D) acting on the rotor, and the at least one slot wedge (30, 31, 32, 33, 34, 35) is thereby held in a deformation state (16) in which the at least one slot wedge (30, 31, 32, 33, 34,35) has a greater extent in the radial direction (R) and / or in the circumferential direction (U) than in a basic state (14) of the at least one slot wedge (30, 31, 32, 33, 34, 35) and, as a result of the greater extent, exerts a clamping force (F_K) on the rotor windings (28) arranged in the at least one rotor lamination slot (21, 22, 23, 24, 25, 26), pressing the rotor windings (28) against the rotor lamination stack (20). Rotor (10) according to claim 1, characterized in that the at least one slot wedge (30, 31, 32, 33, 34, 35) has at least one through-opening (40) through which at least one screw element (42) of the rotor (10) is passed to exert the pressure force (F_D) on the clamping plate (36). Rotor (10) according to claim 1 or 2, characterized in that the rotor (10) has a second clamping plate (38) on a second end face (12) opposite the clamping plate (36) in the axial direction (A) and at least one slot wedge (30, 31, 32, 33, 34, 35) is clamped in the axial direction (A) between the clamping plate (36) and the second clamping plate (38). Rotor (10) according to one of the preceding claims, characterized in that the at least one slot wedge (30, 31, 32, 33, 34, 35) in its basic state (14) has a greater extent in the axial direction (A) than the at least one rotor lamination stack groove (21, 22, 23, 24, 25, 26) and / or that the clamping plate (36) has at least one projection (37) projecting at least partially in the axial direction (A) into the at least one rotor lamination stack groove (21, 22, 23, 24, 25, 26), over which the pressure force (F_D) is exerted on the at least one slot wedge (30, 31, 32, 33, 34, 35). Rotor (10) according to one of the preceding claims, characterized in that the at least one slot wedge (30, 31, 32, 33, 34, 35) at at least one first slot wedge end (44) of two slot wedge ends (44, 46) of the at least one slot wedge (30, 31, 32, 33, 34, 35) opposite each other in the axial extension direction (A) has a greater stiffness against deformation than in a slot wedge area (45) arranged between the opposite slot wedge ends (44, 46). Rotor (10) according to one of the preceding claims, characterized in that the at least one slot wedge (30, 31, 32, 33, 34, 35) is formed in multiple parts. Rotor (10) according to claim 6, characterized in that the at least one slot wedge (30, 31, 32, 33, 34, 35) has at least one first slot wedge part (48) which is made of a different material than a second slot wedge part (50) of the at least one slot wedge (30, 31, 32, 33, 34, 35). Method for manufacturing a rotor (10) according to one of claims 1 to 7, in which the compressive strength of a slot wedge material of the at least one slot wedge (30, 31, 32, 33, 34, 35) is reduced at least in certain areas by the application of heat before or during the at least one slot wedge (30, 31, 32, 33, 34, 35) in its arrangement in the at least one rotor lamination stack slot (21, 22, 23, 24, 25, 26) is subjected to the compressive force (F_D) and thereby brought into the deformation state (16). Electric drive machine (100) for a motor vehicle (K), with a rotor (10) according to one of claims 1 to 7 or with a rotor (10) manufactured according to a method according to claim 8. Motor vehicle (K) with a drive motor (100) according to claim 9 .

Images