Rotor for a rotating electric machine, electric machine having the rotor and method of manufacturing the rotor

Abstract

The invention discloses a rotor (11) of an electric rotating machine (10) having a rotor core (4) concentrically arranged to a rotor shaft (6), wherein the rotor core (4) has slots (3), wherein the slots (3) are filled with at least one electrically conductive material, having a front ring (2) concentrically arranged to the rotor shaft (6) on an axially front end (8) of the slots (3), wherein the front ring (2) has at least one electrically conductive material, having a back ring (2) concentrically arranged to the rotor shaft (6) on an axially back end (9) of the slots (3), wherein the back ring has at least one electrically conductive material, wherein a face of the front and / or back ring (2) facing away from the rotor core (3) has at least partially in axial direction a bevel which is inclined from an outer circumference (21) to an inner circumference (22) of the ring with an inclination angle (α), having at least one support element (1), wherein the support element (1) is configured such that the support element (1) is at least partially form-fittingly connected with the ring (2). The invention also discloses an electric rotating machine (10) and a method for manufacturing a rotor.

Description

Technical Field

[0001] This invention discloses a rotor for a rotating electric motor, an electric motor having a rotor, and a method for manufacturing the rotor. Background Technology

[0002] The rotor of an asynchronous motor is often implemented as a short-circuit rotor. For this purpose, the rotor has a squirrel cage comprising a cage rod and short-circuit rings at the respective axial ends of the cage rod. However, due to the relatively low material strength, the short-circuit rings deform at high rotational speeds.

[0003] WO 2007 / 000413 A1 relates to an asynchronous motor having a stator or a squirrel-cage rotor, wherein the squirrel-cage rotor has a shaft and a lamination assembly and is located in a rotor rod of the lamination assembly, the rotor rods being respectively introduced at both ends of the lamination assembly through openings in end plates and closed by short-circuit rings, the short-circuit rings electrically connecting the ends of the rotor rods on one side of the squirrel-cage rotor, wherein each end plate has a surrounding protrusion that at least partially covers the short-circuit rings on its outer side, and wherein each end plate comprises a portion of the rotor rods and a portion of the short-circuit rings.

[0004] JP H02 273059 A describes a rotor comprising a rotor core, a secondary conductor short-circuit ring, conductor rods, and a shaft. All outer circumferences of the secondary conductor short-circuit ring are covered by an annularly arranged eave of a reinforcing ring, which, like the rotor core, is secured to the shaft by an interference fit. The reinforcement of the short-circuit ring's outer circumference by the reinforcing ring suppresses movement of the short-circuit ring and allows the movement of the conductor rods in the core to correspond to the movement of the short-circuit ring. In one method, excessive pressure is not applied to the connection section between the short-circuit ring and the conductor rods. Accordingly, shear fracture can be avoided during high-speed rotation, and high-speed rotation can be performed up to the rotational limit, which is determined by centrifugal force fracture of the material applied to the rotor core.

[0005] WO 2014 / 124762 A2 discloses a squirrel-cage rotor for an electric motor with a closed short-circuit ring. This squirrel-cage rotor has a front-end region and a cast short-circuit ring. The short-circuit ring is arranged in the front-end region. Furthermore, a fastening element is provided in the front-end region, which achieves a form fit between the front-end region and the short-circuit ring.

[0006] According to EP 2 849 320 A2, a method for manufacturing a squirrel-cage rotor for an asynchronous motor includes: providing a lamination assembly having openings for a plurality of rods for accommodating the rotor squirrel cage; positioning a mold for a short-circuit ring at the front end side of the lamination assembly; and casting the rods and the short-circuit ring. Here, the mold is cast onto the lamination assembly and maintains the stability of the short-circuit ring at the squirrel-cage rotor.

[0007] US 2015 / 188397 A1 discloses the following: a rotor comprising a stacked core having a plurality of slots formed therein; a plurality of rotor bars mounted in the plurality of slots; a pair of end rings configured together and fastened to opposite ends of the rotor bars; a pair of supports fastened together and to opposite outer end faces of the rotor bars; and a shaft mounted in the pair of end rings.

[0008] DE 10 2013 218 473 A1 describes a method for manufacturing a squirrel-cage rotor for an asynchronous motor, comprising: providing a lamination assembly having openings for a plurality of rods for receiving the rotor squirrel cage; positioning a mold for a short-circuit ring on the end side of the lamination assembly; and casting the rods and the short-circuit ring. Here, the mold is cast onto the lamination assembly and maintains the stability of the short-circuit ring on the squirrel-cage rotor. However, a disadvantage here is that the supporting function of the cast mold is lost after cooling. This is because the material for the short-circuit ring shrinks drastically during cooling, creating a cavity between the short-circuit ring and the mold. During operation, this causes deformation of the short-circuit ring due to centrifugal force. Summary of the Invention

[0009] Therefore, the object of the present invention is to improve the stability of the short-circuit ring.

[0010] This objective is achieved by the present invention, namely, a rotor of a rotating electric motor having: - A rotor core arranged co-centered with the rotor shaft, wherein the rotor core has slots, wherein the slots are filled with at least one conductive material. - A front ring arranged co-centered with the rotor shaft at the axial front end of the slot, wherein the front ring has at least one conductive material. - A rear ring arranged co-centered with the rotor shaft at the axial rear end of the slot, wherein the rear ring has at least one conductive material. In this embodiment, at least a portion of the face of the front ring and / or rear ring facing away from the rotor core has an inclined surface in the axial direction, the inclined surface being inclined at an angle from the outer circumference to the inner circumference of the ring, wherein the inclined angle has a value of 3° to 30°. - At least one support element, wherein the support element is configured such that the support element is at least partially form-fitted to the ring. The support element is axially pressed onto the ring, and the support element is supported onto the shaft.

[0011] Furthermore, this objective is achieved through the present invention, namely, a rotating electric motor, particularly an asynchronous motor, having such a rotor.

[0012] Preferably, the rotor core is a metal layer with contacts, wherein the metal layers are riveted, welded, stamped, bonded and / or heat-welded together.

[0013] Advantageously, the metal layers are stacked. However, other types of metal layers can also be considered.

[0014] Advantageously, the rotor core is a laminated assembly.

[0015] Preferably, the groove is closed. However, it can also be a semi-open or open groove.

[0016] The filled slots represent the cage bars of the short-circuit cage. The rings represent the short-circuit rings of the short-circuit cage.

[0017] Preferably, the groove is filled with a conductive material by die casting. Preferably, the front ring and / or the rear ring is formed with a conductive material by die casting.

[0018] Alternatively, the groove can be filled with a conductive material using 3D printing. Alternatively, the front and / or rear rings can be formed with a conductive material using 3D printing. However, other methods are also possible.

[0019] Alternatively, pultruded rods, such as copper rods, can be inserted into the groove, and the corresponding rings can be formed, for example, by means of die casting or 3D printing.

[0020] Advantageously, the ring is connected to the groove material being filled.

[0021] Preferably, the conductive material is copper or aluminum. This is advantageous because it allows for very high efficiency. However, copper alloys or aluminum alloys are also feasible.

[0022] Advantageously, aluminum has 20 N / mm 2 Up to 60 N / mm 2 Temperature-dependent tensile strength.

[0023] One possibility is that the ring and / or groove has an insertion part. This insertion part can be made of a non-conductive material.

[0024] From the end viewpoint, what can be achieved is that the ring has more than one tilt angle in the circumferential direction.

[0025] Advantageously, the ring abuts against the rotor core without any gaps. That is, the ring advantageously abuts against the last layer of material, preferably the last lamination, or against a thrust ring that can achieve the packaging of the material layers.

[0026] In an advantageous embodiment, the support element has at least one segment on the face facing the ring, the segment having an inclined surface in the axial direction, the inclined surface being inclined from the outer circumference to the inner circumference at an angle offset from the inclination angle.

[0027] Therefore, the ring and support elements can be connected in a good shape fit.

[0028] The groove can be installed with or without tilting.

[0029] According to the present invention, the tilt angle has a value of 3° to 30°.

[0030] The advantage of this value is that it enables the achievement of optimal stability for the short-circuit loop.

[0031] Preferably, the material present in the ring and / or groove has greater conductivity than the material present in the support element.

[0032] Preferably, the material present in the support element has a greater mechanical tensile strength than the material present in the ring and / or groove.

[0033] In an advantageous embodiment, the support element has a strength of 800 N / mm². 2 Up to 1200 N / mm 2 Especially 1000N / mm 2 Materials with high tensile strength.

[0034] The described tensile strength allows the rotor to operate in a high-speed range, such as 1500 rpm to 3000 rpm (U / min), when the rotor outer diameter is 100 mm to 200 mm.

[0035] In an advantageous embodiment, the support element is made of steel. For this purpose, tempered steel, having chromium and / or nickel and / or molybdenum, is suitable, for example. Additionally, carburized steel, having chromium and / or nickel and / or molybdenum, is also suitable.

[0036] In addition, the support element can also be made of titanium.

[0037] Steel is particularly suitable due to its high strength, good hardenability, rigidity, and maximum elongation. In addition, steel is inexpensive and can be hot or cold shaped.

[0038] In an advantageous embodiment, the face of the front ring and / or rear ring facing away from the rotor core has at least one first region and at least one second region. The first region has a first sub-sloping surface in the axial direction, which is inclined from the outer circumference of the ring to the inner circumference at a first sub-inclination angle. The second region has a second sub-sloping surface in the axial direction, which is inclined from the outer circumference of the ring to the inner circumference at a second sub-inclination angle. The first sub-inclination angle and the second sub-inclination angle are different.

[0039] In an advantageous embodiment, the support element has at least one first region on the surface facing the ring, the first region having a slope in the axial direction, the slope being inclined from the outer circumference to the inner circumference at a sub-tilt angle offset from the first sub-tilt angle, wherein the support element has at least one second region on the surface facing the ring, the second region having a slope in the axial direction, the slope being inclined from the outer circumference to the inner circumference at a sub-tilt angle offset from the second sub-tilt angle.

[0040] Preferably, the ring and the support element are engaged at least in the areas subjected to centrifugal force during operation.

[0041] This implementation enables higher reception of the radial component.

[0042] In an advantageous embodiment, the support element can be connected to the shaft by means of an interference fit.

[0043] This is advantageous because the support element can thus be used as a balancing element at the same time.

[0044] Alternatively, the support element can also be connected to the shaft by means of a retaining ring. Here, for example, the retaining ring can be connected to the shaft by means of an interference fit, and the support element is clamped between the ring and the retaining ring. Other embodiments can also be considered.

[0045] In an advantageous embodiment, the support element has at least one gap and / or at least one thickened portion, particularly for eliminating imbalance.

[0046] An empty space is, for example, a hole, and a thickened portion is, for example, a material covering at a defined location.

[0047] The void created by negative balancing is also called a borehole. This is particularly advantageous because rotor balancing can be achieved automatically by calculating the imbalance and implementing corresponding holes with corresponding diameters and depths.

[0048] The thickened portion is achieved, for example, by welding, such as by friction welding of a prefabricated cylinder. Preferably, the support element and, for example, the prefabricated cylinder move toward each other under pressure, wherein the support element and the cylinder contact at the contact surface. The resulting friction heats and plasticizes the material.

[0049] The empty space can also be used as a channel for rear ventilation of the rotor.

[0050] Furthermore, the above objective is achieved by the present invention, namely, a method for manufacturing such a rotor having a rotor core arranged co-centered with the rotor shaft, wherein the rotor core has slots, and for a rotating electric motor, it comprises the following steps: -Provide rotor core, - Fill the groove with at least one conductive material. - To form the front ring and / or rear ring, at least one conductive material is applied to the axial front and axial rear ends of the groove by means of a forming device, wherein the forming device is configured such that the face of the front ring and / or rear ring facing away from the rotor core has at least partially a slope in the axial direction, the slope being inclined at an angle from the outer circumference to the inner circumference of the ring, wherein the angle of inclination has a value of 3° to 30°. - A clamping support element, wherein the support element is axially clamped onto a ring, wherein the support element is supported onto a shaft.

[0051] Advantageously, the groove can be filled by using prefabricated rods, particularly copper rods, or by die casting, such as aluminum die casting, or a combination of both. Insertion of other types of insert parts is also possible. Furthermore, the groove filling can also be achieved using 3D printing.

[0052] Advantageously, the ring is formed by die casting, such as aluminum die casting. Alternatively, inserting an insert made of, for example, aluminum or other materials is also possible. Furthermore, the ring can also be formed using 3D printing.

[0053] In an advantageous embodiment, the support element is thermofitted onto the shaft.

[0054] In an advantageous embodiment, for thermo-press fitting, the support element is heated to a temperature of 100°C to 140°C, preferably 120°C.

[0055] According to the present invention, the support element is pressed onto the ring in the axial direction.

[0056] In an advantageous embodiment, the support element is pressed together with a binding force of 20t to 40t, preferably 30t.

[0057] This invention is particularly well-suited for asynchronous motors with short-circuited rotors. Such rotating motors are used in various fields, such as in fans, pumps, compressors, machine tools, and in the drives of electric and hybrid vehicles. Furthermore, this invention is well-suited for motors used in high-power fans.

[0058] This invention is particularly well suited for rotating motors in the high-speed range.

[0059] This invention is applicable to pure asynchronous motors, but also to other rotating motors, such as hybrid motors, such as asynchronous motors with permanent magnets.

[0060] An asynchronous motor with permanent magnets asynchronously accelerates to high speeds and then enters synchronous operation. This is advantageous because it enables high efficiency and power output.

[0061] The advantage of this invention is that the rotor can operate at a circumferential speed of over 90 m / s without worrying about deformation of the short-circuit ring.

[0062] Even a circumferential speed of 150 m / s is feasible. In particular, such a circumferential speed at the outer circumference of the rotor is essential in industrial technology and in the drive of electric vehicles. Attached Figure Description

[0063] The present invention will now be described and illustrated in detail with reference to the embodiments shown in the accompanying drawings. Herein are: Figure 1 A first embodiment of the rotor according to the invention is shown. Figure 2 A second embodiment of the rotor is shown. Figure 3 A third embodiment of the rotor, not included in this invention, is shown. Figure 4 A fourth embodiment of the rotor is shown. Figure 5 A fifth embodiment of the rotor is shown. Figure 6 This shows the view from the end side. Figure 5 The rotor, Figure 7 A rotating electric motor with a rotor is shown, and Figure 8 A method for manufacturing a rotor is shown. Detailed Implementation

[0064] Figure 1 A first embodiment of the rotor 11 according to the present invention is shown.

[0065] Figure 1 A rotor core 4 is shown, which is co-centered with the rotor shaft 6. The rotor core 4 has a slot 3, which is filled with a conductive material. Figure 1 A short-circuit ring 2, which is co-centered with the rotor shaft 6 at the axial rear end 9 of the slot 3, is shown. The short-circuit ring is made of conductive material.

[0066] The face of the ring 2 facing away from the rotor core 3 has an inclined surface in the axial direction 7 in the attached figure, which is inclined at an angle α from the outer circumference 21 to the inner circumference 22 of the ring 2.

[0067] The accompanying drawing shows a support element 1, which is at least partially connected to the ring 2. The rotor core 4 and the support element 1 are constrained to the shaft 5 in the drawing.

[0068] The support element 1 has a section on the surface facing the ring 2, which has an inclined surface in the axial direction 7. This inclined surface slopes from the outer circumference 21 to the inner circumference 22 at an angle α' opposite to the inclination angle α. The inclination angle α is shown in the figures as 13°. Preferably, the value of the inclination angle α is in the range of 3° to 30°, particularly 10° to 20°. The figures show a radial form fit between the short-circuit ring 2 and the support element 1.

[0069] The advantage of this invention is that it provides improved speed performance, particularly for the rotor 11 of an asynchronous motor. Under high-speed loads, there is no need to worry about the tilting of the short-circuit ring or the flow of the short-circuit ring material.

[0070] Support element 1 is axially matched with short-circuit ring 2. Support element 1 is supported on shaft 5. Thus, a mechanical clamping is provided from shaft 5 to support element 1 and then to short-circuit ring 2.

[0071] Figure 2 A second embodiment of rotor 11 is shown. Figure 2 As shown, the face of the ring 2 facing away from the rotor core 4 has at least one first region and at least one second region. The first region has a first sub-sloping surface in the axial direction 7, which is inclined from the outer circumference 21 to the inner circumference 22 of the ring 2 at a first sub-inclination angle β. The second region has a second sub-sloping surface in the axial direction 7, which is inclined from the outer circumference 21 to the inner circumference 22 of the ring 2 at a second sub-inclination angle γ. The first sub-inclination angle β and the second sub-inclination angle γ are different.

[0072] The attached figure shows three first regions with sub-tilt angle β and two second regions with sub-tilt angle γ.

[0073] Furthermore, the accompanying drawing shows a support element 1. The drawing shows that the support element 1 has at least one first region on the surface facing the ring 2, the first region having an inclined surface in the axial direction 7, the inclined surface being inclined from the outer circumference 21 to the inner circumference 22 at a sub-inclination angle β' that is offset from the first sub-inclination angle β. The support element 1 also has at least one second region on the surface facing the ring, the second region having an inclined surface in the axial direction 7, the inclined surface being inclined from the outer circumference 21 to the inner circumference 22 at a sub-inclination angle γ' that is offset from the second sub-inclination angle γ.

[0074] The attached figure shows three first regions with sub-tilt angles β' and two second regions with sub-tilt angles γ'.

[0075] Such embodiments of the present invention are used for higher reception of radial force components.

[0076] Figure 3A third embodiment of rotor 11, not included in this invention, is shown. The illustrated embodiment is suitable for particularly high circumferential speeds on the outer circumference of rotor 11. Circumferential speeds can reach up to 180 m / s.

[0077] The accompanying drawing shows a support element 1 having an inner support disk 101 and an outer support device 102. In the drawing, the inner support disk 101 and the outer support device 102 are connected by a material fit, preferably by means of welding.

[0078] Preferably, the connection between the support disk 101 and the support device 102 is implemented on the outer circumference or at least near the outer circumference. Advantageously, the inner support disk 101 has a void, wherein the number of voids corresponds to the number of slots 3 in the rotor core 4.

[0079] Advantageously, an inner support disk 101 is introduced during the formation of ring 2. Preferably, the inner support disk 101 is subsequently cast by die casting during the formation of ring 2. After cooling, an outer support disk 102 is applied, particularly by means of a bonding force in the axial direction. Preferably, welding is then performed. Thus, a weld seam exists on the outer circumference of rotor 11. Welding is optional.

[0080] Figure 4 A fourth embodiment of rotor 11 is shown. Besides those already implemented... Figure 1 The implementation scheme described in the document, Figure 4 The implementation scheme has a gap 13 in the support element 1, which is used to eliminate imbalance.

[0081] The advantage here is that the balancing is not performed in the short-circuit ring as has been the case so far, but in the support element 1. Therefore, the support element 1 additionally functions as a balancing disc.

[0082] Furthermore, it is possible to install a thickened portion on the support element 1 to eliminate imbalance. This is not shown in the accompanying drawings.

[0083] Figure 5 A fifth embodiment of rotor 11 is shown. The accompanying drawings show channels 14 and 15 for rear ventilation of rotor 11. This is in Figure 6 This will be explained in more detail later.

[0084] Figure 6 This shows the view from the end side. Figure 5 Rotor 11. Two accompanying drawings show channels 14 and 15, which are used for rear ventilation of rotor 11. Channel 14 can be cast, for example. Channel 15 is present in support element 1. Air is drawn in during rotation of rotor 11 through the opening. This is used for rear ventilation.

[0085] The air discharged from the outer circumference of the short-circuit ring 2 is drawn in by the gaps in the support element 1 during rotation.

[0086] Figure 7 A rotary electric motor 10 with a rotor 11 is shown. The accompanying drawing shows a stator 12, a shaft 5, and a rotor shaft 6. Viewed in the axial direction 7, the rotor 11 has a support element 1 at its axial front end 8. Furthermore, a support element 1 is shown at the axial rear end 9 of the rotor 11.

[0087] Figure 8 A method for manufacturing a rotor 11 is shown, the rotor having a rotor core arranged co-centered with the rotor shaft, wherein the rotor core has slots.

[0088] In method step S1, a rotor core is provided.

[0089] In method step S2, the groove 3 is filled with a conductive material. Here, the groove 3 can be filled with a prefabricated rod or by means of die casting. It is also possible to achieve filling with a combination of prefabricated rods or other inserts and die casting.

[0090] In step S3, a conductive material is applied to the front and / or axial rear end of the groove 3 to form the front or rear ring 2. This is advantageously achieved by means of die casting.

[0091] In step S4, the support element 1 is clamped. Advantageously, the support element 1 is guided onto the shaft during the clamping process. The out-of-roundness of the short-circuit ring 2, in particular the cast-in-place ring 2, is corrected by the ring 2 and the already described ramp of the support element 1, and the coaxiality of the entire short-circuit ring 2 to the shaft 5 and then to the rotor assembly is improved.

[0092] Advantageously, the support element 1 is thermo-pressed onto the shaft and forcefully axially pressed against the short-circuit ring 2. Thus, the preferred axially inward-facing surface of the support element 1 and the outer surface of the short-circuit ring 2 are fixedly abutted against each other. Preferably, the bonding force is maintained for approximately 20 to 30 seconds to ensure complete contact. Advantageously, a bonding force of approximately 30t is applied in short-circuit rings with a diameter of 130 mm to 170 mm, particularly 150 mm. Preferably, for thermo-pressing, the support element is heated to approximately 120°C.

[0093] The advantage of this invention is that the cast skin formed during the die-casting of the short-circuit ring secures the short-circuit ring.

[0094] Due to the robustness of the support elements, rotors manufactured using this method significantly reduce the risk of material movement due to centrifugal loads.

Claims

1. A rotor (11) of a rotary electric motor (10), said rotor having: - A rotor core (4) arranged co-centered with the rotor shaft (6), wherein, The rotor core has grooves (3), wherein the grooves (3) are filled with at least one conductive material. - A front ring (2) arranged co-centered with the rotor shaft (6) at the axial front end (8) of the groove (3), wherein the front ring (2) has at least one conductive material. - A rear ring (2) arranged co-centered with the rotor shaft (6) at the axial rear end (9) of the groove, wherein the rear ring has at least one conductive material. The front ring and / or the rear ring (2) having a face facing away from the rotor core (3) at least partially having a slope in the axial direction, the slope being inclined at an angle (α) from the outer circumference (21) to the inner circumference (22) of the ring (2). - At least one support element (1), wherein the support element (1) is configured such that the support element (1) is at least partially form-fitted to the ring (2), wherein the support element (1) is axially pressed onto the ring (2), wherein the support element (1) is supported onto the shaft (5), wherein the face of the front ring and / or the rear ring (2) facing away from the rotor core (4) has at least one first region and at least one second region, the first region having a first sub-sloping surface in the axial direction, the first sub-sloping surface being inclined from the outer circumference of the ring (2) to the inner circumference at a first sub-inclination angle (β), the second region having a second sub-sloping surface in the axial direction, the second sub-sloping surface being inclined from the outer circumference of the ring (2) to the inner circumference at a second sub-inclination angle (γ), wherein the first sub-inclination angle (β) is different from the second sub-inclination angle (γ).

2. The rotor (11) according to claim 1, wherein, The support element (1) has at least one segment on the surface facing the ring (2), the segment having an inclined surface in the axial direction (7) at an angle (α') from the outer circumference to the inner circumference.

3. The rotor (11) according to claim 1 or 2, wherein, The support element (1) has a belt with 800 N / mm 2 Up to 1200 N / mm 2 Materials with high tensile strength.

4. The rotor (11) according to claim 3, wherein, The support element (1) has a 1000 N / mm band. 2 Materials with high tensile strength.

5. The rotor (11) according to claim 1 or 2, wherein, The support element (1) is made of steel.

6. The rotor (11) according to claim 1, wherein, The support element (1) has at least one first region on the surface facing the ring (2), the first region having an inclined surface in the axial direction, the inclined surface being inclined from the outer circumference to the inner circumference at a sub-inclination angle (β') that is offset from the first sub-inclination angle (β), wherein the support element (1) has at least one second region on the surface facing the ring (2), the second region having an inclined surface in the axial direction, the inclined surface being inclined from the outer circumference to the inner circumference at a sub-inclination angle (γ') that is offset from the second sub-inclination angle (γ).

7. The rotor (11) according to claim 1 or 2, wherein, The support element (1) can be connected to the shaft (5) by means of an interference fit.

8. The rotor (11) according to claim 1 or 2, wherein, The support element (1) has at least one empty portion (13) and / or at least one thickened portion for eliminating imbalance.

9. A rotary electric motor (10) having a rotor (11) according to any one of claims 1 to 8.

10. The rotary motor (10) according to claim 9, wherein the rotary motor is an asynchronous motor.

11. A method for manufacturing a rotor (11) for a rotating electric motor (10), said rotor being the rotor of any one of claims 1 to 8, said rotor having a rotor core (4) arranged co-centered with a rotor shaft (6), wherein, The rotor core (4) has a slot (3), and the method comprises the following steps: - Provide the rotor core (3). - The groove (3) is filled with at least one conductive material. - To form the front ring and / or the rear ring (2), at least one conductive material is applied at the axial front end (8) and axial rear end (9) of the groove (3) by means of a forming device, wherein the forming device is configured such that the face of the front ring and / or the rear ring (2) facing away from the rotor core (3) has at least partially a slope in the axial direction, the slope being inclined at an angle (α) from the outer circumference to the inner circumference of the ring (2). - A clamping support element (1) is axially clamped onto a ring (2), wherein the support element (1) is supported onto a shaft (5), wherein the front ring and / or the rear ring (2) has at least one first region and at least one second region on the face opposite to the rotor core (4), the first region having a first sub-sloping surface in the axial direction, the first sub-sloping surface being inclined from the outer circumference of the ring (2) to the inner circumference at a first sub-inclination angle (β), the second region having a second sub-sloping surface in the axial direction, the second sub-sloping surface being inclined from the outer circumference of the ring (2) to the inner circumference at a second sub-inclination angle (γ), wherein the first sub-inclination angle (β) is different from the second sub-inclination angle (γ).

12. The method according to claim 11, wherein, The support element (1) is hot-pressed onto the shaft (5).

13. The method according to claim 11 or 12, wherein, For hot pressing, the support element (1) is heated to a temperature of 100°C to 140°C.

14. The method according to claim 13, wherein, The support element (1) is heated to a temperature of 120°C.

15. The method according to claim 11 or 12, wherein, The support element (1) is pressed onto the ring (2) in the axial direction.

16. The method according to claim 11 or 12, wherein, The support element (1) is pressed with a binding force of 20t to 40t.

17. The method according to claim 16, wherein, The support element (1) is pressed with a binding force of 30t.

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