Rotor for a synchronous machine, synchronous machine, electric axle drive for a motor vehicle, motor vehicle and method for producing a rotor

Abstract

The invention relates to a rotor (100) for a synchronous machine, wherein the synchronous machine is designed as an electrically excited synchronous machine, wherein the rotor (100) is designed as a salient-pole rotor. The rotor (100) comprises a plurality of laminated cores (120) bent in a U shape, a support element (110) for supporting the laminated cores (120), and a circumferential element (130) which is formed so as to hold the laminated cores (120) on the support element (110). The laminated cores (120) are arranged between the support element (110) and the circumferential element (130). The laminated cores (120) are arranged adjacent to one another in the circumferential direction of the rotor (100) in order to form a rotor yoke of the rotor (100) and a plurality of rotor teeth (124) of the rotor (100). Each of the laminated cores (120) comprises a plurality of grain-oriented electrical steel sheets (122) which are stacked one on top of the other radially with respect to the rotor (100).

Description

[0001] Rotor for an electric machine, electric machine, electric axle drive for a motor vehicle, motor vehicle and method for producing a rotor

[0002] The present invention relates to a rotor for an electric machine, to an electric machine, to an electric axle drive for a motor vehicle, to a motor vehicle and to a method for producing a rotor.

[0003] In the case of radially laminated electric motors or electrical machines, examples of stators for reluctance and magnetic motors, as well as of reluctance rotors, are known which are not constructed as an axially laminated package but are radially laminated. The reason for such an arrangement is to be able to use grain-oriented electrical steel sheets which may be unsuitable for conventional axially laminated packages because more losses may occur at lower saturation induction in magnetic flux directions orthogonal to the grain orientation. However, in a conventional radially laminated arrangement, eddy current losses may occur particularly in stators but also on rotor surfaces because the eddy currents have significantly more electrically conductive path available over the axial extent. Such additional losses can therefore even outweigh the advantages of grain-oriented sheets in conventional arrangements.

[0004] In this context, the present invention provides an improved rotor for a synchronous machine, an improved synchronous machine, an improved electric axle drive for a motor vehicle, an improved motor vehicle, and an improved method for manufacturing a rotor according to the main claims. Advantageous configurations result from the dependent claims and the following description.

[0005] According to embodiments, in particular, a radially laminated rotor for electrically excited synchronous machines can be provided, in particular a salient pole rotor with radially laminated rotor teeth. The advantage here consists in particular in being able to use grain-oriented electrical sheets which have a high saturation flux density, as a result of which the rotor tooth widths can also be reduced. This consequently enables a larger winding space for the rotor winding and thus more efficiency as well as a higher power. The radial lamination can be in U-form, with two adjacent poles always sharing a lamination package.

[0006] Advantageously, in particular in the case of rotors of electrically excited synchronous motors, primarily with salient pole rotors where the installation space can be highly restricted, as much space as possible can be provided to accommodate the rotor windings, without, however, the need for a reduction or a substantial reduction of the rotor tooth width. Thus, for example, saturation can be reduced and consequently the torque of the machine increased. Furthermore, in particular, it can be prevented that in the rotor of radially laminated machines, especially at the air gap, eddy current losses occur due to harmonic magnetic fields and can heat the rotor, and thus power retention or power increase can be achieved. Grain-oriented electrical sheets can be used which offer only low losses at high saturation induction for magnetic fluxes along the grain orientation.Furthermore, an increase in the winding window can be achieved, thereby enabling an increase in power density and efficiency.

[0007] A rotor for a synchronous machine, the synchronous machine being configured as an electrically excited synchronous machine, the rotor being configured as a salient pole rotor, comprises a plurality of U-shaped bent sheet packages, a carrier element for carrying the sheet packages, and a circumferential element shaped to hold the sheet packages on the carrier element, the sheet packages being arranged between the carrier element and the circumferential element, the sheet packages being arranged adjacent to one another in the circumferential direction of the rotor to form a rotor core of the rotor and a plurality of rotor teeth of the rotor, each of the sheet packages having a plurality of axially oriented electrical sheets which are stacked one on top of the other with respect to the rotor radially.

[0008] The synchronous machine can be provided for an electric drive train of a vehicle. The synchronous machine can also be referred to as an electric machine. The laminated cores can also be referred to as radially laminated with respect to the rotor. The laminated cores can also be referred to as U-elements. With respect to the rotor can mean with respect to a rotation axis of the rotor. The rotor can also have a plurality of coils. Here, each coil can be arranged on one of the rotor teeth. The electrical sheets can also be referred to as laminations. The carrier element can be formed to carry at least the laminated cores. The carrier element can also be referred to as a rotor carrier. The carrier element can be formed to receive or form a shaft.

[0009] In the area of the rotor teeth, the electrical sheets of the sheet packages extend radially with respect to the rotor, and in the area of the rotor shaft, they extend tangentially with respect to the rotor. More precisely, the main extension planes of the electrical sheets of the sheet packages extend in the corresponding direction. This has the advantage that eddy current losses in the air gap can be avoided and an increase in power density can be achieved.

[0010] The rotor can also have a plurality of pole shoes. Here, a pole shoe can be arranged on each rotor tooth. Additionally or alternatively, the pole shoes can be electrically isolated from the sheet packages. The pole shoes can be formed separately from the sheet packages. Such an embodiment has the advantage that it enables the use of separately manufactured air coils to increase the slot filling factor.

[0011] The pole shoes can be arranged between the laminated cores and the circumferential element. Here, the circumferential element can be shaped to hold the pole shoes against the laminated cores. The pole shoes can have a soft magnetic composite material or a plurality of grain-oriented or non-grain-oriented electrical sheets that are stacked axially with respect to the rotor. Thus, the pole shoes can be shaped to be suitable for the specific application purpose. In particular, eddy current losses at the air gap can be significantly reduced by axially laminating such pole shoes. Alternatively, the pole shoes can be integrally formed with the circumferential element. Here, the pole shoes and the circumferential element can have a plurality of grain-oriented or non-grain-oriented electrical sheets that are stacked axially with respect to the rotor.Thus, an axially laminated rotor ring including pole shoes can be provided as a circumferential element. Such an embodiment offers the advantage that by axially laminating such pole shoes together with the circumferential element, eddy current losses at the air gap can be significantly reduced.

[0012] According to one embodiment, the electrical sheets of the sheet packages can have the same dimensions. Alternatively, the electrical sheets of the sheet packages can have different dimensions. Such an embodiment offers the advantage that an angle of a receiving gap of the rotor teeth into which the pole shoes or segmented pole shoes are or will be inserted can also be adjusted in a suitable manner. Depending on this, there can thus be a concavity or convexity of the teeth in their middle. A convexity of the teeth could also be advantageous so that the sheet packages do not fan out under a radial pressing force.

[0013] Furthermore, the carrier element may have a star-shaped cross-section and additionally or alternatively be made of a non-magnetic material. In this case, the star tips of the carrier element may extend at least partially radially outwards towards the rotor teeth and are additionally or alternatively segmented. If the star tips are formed by cementing, they are formed separately from a central body of the carrier element. By means of a carrier element shaped in this way and in particular by an embodiment made of non-magnetic material, flow barriers for the Q-flow can be formed, which increases the reluctance of the rotor.

[0014] Furthermore, at least one cavity can be arranged within the carrier element and additionally or alternatively between the carrier element and the sheet packages. Optionally additionally, the cavity can be configured to conduct a cooling fluid for cooling the rotor. Such an embodiment offers the advantage that the rotor can be cooled in a space-saving and simple manner..

[0015] The rotor can also have a plurality of coils. Here, each coil can be arranged on one of the rotor teeth and additionally or alternatively be embodied as a separately manufactured air coil. At least one coil can be mounted on each rotor tooth. Such an embodiment offers the advantage that the use of separately manufactured or prefabricated air coils is enabled to increase the slot fill factor.

[0016] A synchronous machine includes a stator and a rotor rotatably mounted relative to the stator, the rotor being embodied as an embodiment of a rotor referred to herein.

[0017] An embodiment of a rotor referred to herein can be advantageously employed or used in a synchronous machine to enable an increase in power density and efficiency of the synchronous machine through an enlarged winding window.

[0018] Furthermore, the invention relates to an electric axle drive for a motor vehicle having at least one synchronous machine, a transmission device, and a rectifier. The electric axle drive is characterized in that the synchronous machine is configured as described.

[0019] The transmission device can have a transmission for reducing the rotational speed of the synchronous machine and a differential.

[0020] In addition, the invention relates to a motor vehicle having an electric axle drive and / or a synchronous machine. The motor vehicle is characterized in that the electric axle drive and / or the synchronous machine is configured as described. A method for manufacturing an embodiment of a rotor mentioned herein comprises the following steps:

[0021] Providing the laminated cores, wherein the electrical sheets are stacked, cut to size and pressed into a U-shape; and

[0022] Arranging the laminated cores between the carrier element and the circumferential element.

[0023] In the arranging step, a plurality of coils can also be arranged on the rotor teeth. Additionally or alternatively, a plurality of pole shoes can be arranged on the rotor teeth in the arranging step.

[0024] According to an embodiment, in the provision step, the electrical sheets can first be stacked and then pressed as a stack, or first pressed individually and then stacked. Such an embodiment offers the advantage that the flexibility regarding the processes can be increased.

[0025] Also, in the provision step, the electrical sheets can be cut to size before or after pressing. Such an embodiment offers the advantage that the manufacturing process can be made particularly flexible.

[0026] The invention will be explained in more detail by way of example with reference to the accompanying drawings.

[0027] They show:

[0028] Fig. 1 a schematic illustration of an exemplary embodiment of a rotor for a synchronous machine;

[0029] Fig. 2 a schematic illustration of an exemplary embodiment of a rotor for a synchronous machine;

[0030] Fig. 3 is a schematic illustration of an exemplary rotor for a synchronous machine;

[0031] Fig. 4 is a schematic illustration of a sector of an exemplary rotor for a synchronous machine; Fig. 5 is a schematic illustration of a lamination pack of an exemplary rotor for a synchronous machine;

[0032] Fig. 6 is a schematic illustration of lamination packs of an exemplary rotor for a synchronous machine;

[0033] Fig. 7 is a schematic illustration of a synchronous machine according to an exemplary embodiment;

[0034] Fig. 8 is a flowchart of an exemplary method for manufacturing a rotor for a synchronous machine; and

[0035] Fig. 9 is a schematic illustration of a motor vehicle with an electric axle drive according to an exemplary embodiment.

[0036] In the following description of preferred embodiments of the present invention, the same or similar reference signs are used for elements shown in the various figures and having similar functions, and a repeated description of these elements is dispensed with.

[0037] Fig. 1 shows a schematic illustration of an embodiment of a rotor 100 for a synchronous machine. The synchronous machine for which the rotor 100 is provided is in particular embodied as an electrically excited synchronous machine. The rotor 100 is embodied as a salient-pole rotor or salient-pole armature.

[0038] The rotor 100 includes a carrier element 110, a plurality of laminated core packages 120, and a circumferential element 130. The carrier element 110 is configured or shaped to carry the laminated core packages 120. The circumferential element 130 is configured or shaped to hold the laminated core packages 120 on the carrier element 110. The laminated core packages 120 are arranged between the carrier element 110 and within the circumferential element 130.

[0039] The laminated core packages 120 are arranged adjacent to each other in the circumferential direction of the rotor 100 to form a rotor core of the rotor 100 and a plurality of rotor teeth 124 of the rotor 100. Each laminated core package 120 is bent in a U-shape. Each laminated core package 120 includes a plurality of grain-oriented electrical steel sheets 122. The electrical steel sheets 122 are stacked radially on top of each other with respect to the rotor 100 or with respect to a rotation axis of the rotor 100.

[0040] Thus, the rotor 100 has a plurality of radially laminated U-shaped bent sheet packages or U-elements, which form or represent the rotor hub and the rotor teeth 124. The electrical sheets 122 of the sheet packages 120 extend in the radial direction with respect to the rotor 100 in the area of the rotor teeth 124 and in the tangential direction with respect to the rotor 100 in the area of the rotor hub. Put differently, both legs of each U-shaped bent sheet package 120 point radially outwards.

[0041] The carrier element 110 has a star-shaped footprint. In this case, the star tips of the carrier element 110 extend radially outwards over at least a partial section towards the rotor teeth 124 and / or the circumferential element 130. By way of example only, in Fig. 1 the star tips extend up to the circumferential element 130, which is for example embodied as a bandage or rotor bandage. Additionally or alternatively, the star tips of the carrier element 110 are shorter or segmented or are embodied separately from the rest of the carrier element 110. The carrier element 110, which is also referred to as the rotor carrier, in particular has a non-magnetic material. An embodiment of non-magnetic material forms flux barriers for the Q-flux here, which increases the reluctance of the rotor 100. The carrier element 110 is for example embodied in one piece or axially laminated or formed by an axial stack of laminations.

[0042] Furthermore, the rotor 100 includes a plurality of coils 140 or a rotor winding. Each coil 140 is arranged on one of the 110. The coil 140 is, for example, embodied as a prefabricated or separately manufactured air coil. In Fig. 1, only six rotor teeth 124 and six coils 140 are shown by way of example, with a coil 140 being arranged on each rotor tooth 124. At least one coil 140 is arranged on each rotor tooth 124.

[0043] Fig. 2 shows a schematic illustration of an exemplary embodiment of a rotor 100 for a synchronous machine. The rotor 100 is similar to the rotor in Fig. 1. More precisely, the rotor  100 corresponds to the rotor in Fig. 1, except that the rotor 100 additionally has a plurality of pole shoes 250, which form stamped-out rotor teeth 224 of the laminated cores 120, the star tips of the carrier element 110 are shortened, and additionally a shaft 260 is shown.

[0044] The pole shoes 250 are arranged between the laminated packages 120 and the circumferential element 130. The circumferential element 130 is shaped to hold the pole shoes 250 against the laminated packages 120. A pole shoe 250 is arranged on each of the salient rotor teeth 224. Each of the coils 140 is arranged between the laminated packages 120 and a pole shoe 250.

[0045] The pole shoes 250 are axially laminated or formed by axially stacked electrical sheets with respect to the rotor 100 or its axis of rotation, which are grain-oriented or non-grain-oriented. The pole shoes 250 are electrically insulated from the laminated packages 120. Alternatively, the pole shoes 250 are formed from a composite material, in particular a soft magnetic composite material.

[0046] To form the exploited rotor teeth 224, the electrical sheets 122 of the sheet packages 120 according to the exemplary embodiment shown here have different dimensions or lengths. By means of such bulged teeth 224, fanning out of the sheet packages 120 can be prevented in the case of a radial pressing force. The exploited rotor teeth 224 engage in the pole shoes 250, which have correspondingly recessed sections.

[0047] According to an exemplary embodiment, at least one cavity is arranged within the carrier element 110 and / or between the carrier element 110 and the sheet packages 120. The cavity is formed, for example, to conduct a cooling fluid for cooling the rotor 100.

[0048] Fig. 3 shows a schematic illustration of an embodiment of a rotor 100 for a synchronous machine. The rotor 100 is similar to the rotor in Fig. 2. More precisely, the rotor 100 corresponds to the rotor in Fig. 2, except that the pole shoes 250 are formed integrally with the peripheral element 130.

[0049] The pole shoes 250 and the peripheral element 130 thus form an integrated unit. The pole shoes 250 and the peripheral element 130 comprise a plurality of grain-oriented or non-grain-oriented electrical sheets which are stacked axially with respect to the rotor 100. In other words, the integrated unit represents an axially laminated rotor ring including the pole shoes 250 as a peripheral element 130 combined with the pole shoes 250.

[0050] Fig. 4 shows a schematic representation of a sector of an embodiment of a rotor 100 for a synchronous machine. The rotor 100 is similar to the rotor in Fig. 2. More precisely, the rotor 100 corresponds to the rotor in Fig. 2, except that the laminated cores 120 form recessed rotor teeth 424, one of which is shown in the sector illustrated here.

[0051] To form the recessed rotor teeth 424, the electrical sheets 122 of the laminated cores 120 have the same dimensions or lengths according to the embodiment illustrated here. The pole shoes 250 accordingly have recessed sections that engage into the recessed rotor teeth 424.

[0052] Fig. 5 shows a schematic representation of a lamination pack 120 of an exemplary rotor for a synchronous machine. The lamination pack 120 corresponds to or is similar to one of the lamination packs of one of the rotors from one of the figures described herein. The lamination pack 120 is bent in a U-shape and is composed of a plurality of stacked electrical sheets 122.

[0053] Fig. 6 shows a schematic representation of lamination packs 120 of an exemplary rotor for a synchronous machine. Here, only six lamination packs 120 are shown by way of example, which correspond to or are similar to the lamination packs of one of the rotors from one of the figures described herein. The lamination packs 120 are assembled or joined together to form a body of the rotor with the rotor hub and only six rotor teeth, which are, for example, formed as offset rotor teeth 224.

[0054] Fig. 7 shows a schematic representation of a synchronous machine 700 according to an embodiment. The synchronous machine 700 is particularly embodied as an electrically excited synchronous machine. The synchronous machine 700 includes a rotor 100 and a stator 706. The rotor 100 is rotatably mounted relative to the stator 706. The rotor 100 corresponds to or is similar to the rotor from one of the previously described figures.

[0055] It should be noted that in Fig. 7, only by way of example, the rotor 100 is shown as being internal and the stator 706 as being external.

[0056] Fig. 8 shows a flowchart of an embodiment of a method 800 for manufacturing a rotor for a synchronous machine. The manufacturing method 800 is executable to manufacture the rotor from one of the figures described above or a similar rotor. The manufacturing method 800 includes a step 802 of providing and a step 804 of arranging.

[0057] In the providing step 802, the laminated cores are provided. The electrical sheets for the laminated cores are stacked, cut to size, and pressed into a U-shape. Subsequently, in the arranging step 804, the laminated cores are arranged between the carrier element and the peripheral element.

[0058] According to one embodiment, in step 802 of the provision, the electro sheets are first stacked and subsequently pressed as a stack. According to another embodiment, in step 802 of the provision, the electro sheets are first pressed individually and subsequently stacked. Further, depending on the embodiment, in step 802 of the provision, the electro sheets are cut to size before or after pressing.

[0059] Stated differently, the production or manufacture of the sheet packages or U-elements is carried out by stacking sheet laminations or electro sheets and subsequently pressing them into the desired shape. The cutting of the laminations to the desired length can be done before or after pressing. Alternatively, it is also possible to press individual laminations and subsequently stack them.

[0060] Fig. 9 shows a schematic illustration of a motor vehicle 900 with an electric axle drive 905 according to an embodiment. In the illustration of Fig. 9 of the motor vehicle 900, wheels 901, merely示例性 four wheels 901, an electric energy storage device 903, for example a battery, and the electric axle drive 905 are shown. The electric axle drive 905 includes an inverter 907, a synchronous machine 700, and a transmission device 909. The synchronous machine 700 is the synchronous machine from Fig. 7 or a similar synchronous machine.

[0061] (Note: "beispielhaft" is translated as "exemplary" here, which might not be a very common English word in this context. A more common translation could be "for example".)Electrical energy for operating the synchronous machine 700 is provided by an energy supply device, here the electrical energy storage 903. The electrical energy storage 903 is configured to provide direct current, which is converted into alternating current, for example three-phase alternating current, using an inverter 907 of the electric axle drive 905 and provided to the synchronous machine 700.

[0062] A shaft driven by the synchronous machine 700 is coupled directly or using the transmission device 909 to at least one wheel 901 of the motor vehicle 900. Thus, the motor vehicle 900 can be moved using the synchronous machine 700. According to an exemplary embodiment, the electric axle drive 905 includes a housing in which at least the inverter 907, the synchronous machine 700 and the transmission device 909 are arranged.

[0063] Following, with reference to the figures described above, exemplary embodiments and advantages of the exemplary embodiments are again summarized and briefly explained in other words. According to the exemplary embodiments, for a rotor 100 of a synchronous machine 700, in particular a salient-pole rotor or salient-pole runner for an electrically excited synchronous machine, a construction of the rotor yoke including rotor teeth 124 or 224 or 424 made of radially laminated U-elements or laminate packages 120 made of grain-oriented electrical steel 122 is provided. Optionally additionally, a combination of such laminate packages 120 with segmented axially laminated pole shoes 250 or an axially laminated rotor ring as a circumferential element 130 including pole shoes 250 or pole shoes 250 made of, for example, SMC material (Soft Magnetic Composites; soft magnetic composite materials) is provided.

[0064] Thus, the rotor teeth 124, 224, or 424 can also be constructed or formed with segmented pole shoes 250, which are then secured or will be secured by a rotor bandage or a ring as a circumferential element 130, also including the pole shoes 250. Such an arrangement enables, on the one hand, the use of separately manufactured air coils 140 to increase the slot filling factor, and on the other hand, the eddy current losses at the air gap can be significantly reduced by axially laminating such pole shoes 250 or such a ring. These segmented pole shoes 150 or this ring as a circumferential element 130 are made of grain-oriented or non-grain-oriented electrical steel sheet. The contact area between the steel sheet packages 120 and the pole shoes 250 can be configured to be electrically insulating. Alternatively, the pole shoes 250 can also be made or will be made of SMC material (Soft Magnetic Composites; soft magnetic composite materials).

[0065] The sheet packages 120 or U - elements can be made of electro - sheets 122 or lamellas of the same length or different lengths. As a result, for example, the angle of the receiving gap into which the segmented pole shoes are inserted can also be adjusted. In the case of lamellas of the same length, for example, a recess of the teeth in their middle would occur, see the recessed rotor teeth 424. However, a bulge of the teeth, see the bulged rotor teeth 224, could in turn be advantageous so that the sheet packages 120 or U - elements do not fan out under a radial pressing force. The exemplary embodiments described and shown in the figures are only chosen by way of example. Different exemplary embodiments can be combined with one another completely or with respect to individual features. Also, one exemplary embodiment can be supplemented by features of another exemplary embodiment.

[0066] Furthermore, method steps according to the invention can be repeated and carried out in a different order than that described.

[0067] If an embodiment includes an "and / or" link between a first feature and a second feature, this can be read such that the embodiment according to one embodiment has both the first feature and the second feature and according to another embodiment has either only the first feature or only the second feature.

[0068] Reference symbol

[0069] 100 rotors

[0070] 110 support element

[0071] 120 sheet package

[0072] 122 Electrical sheet

[0073] 124 rotor tooth

[0074] 130 Perimeter element

[0075] 140 coil

[0076] 224 bulged rotor tooth

[0077] 250 pole piece.

[0078] 260 Wave

[0079] 424 indented rotor tooth

[0080] 700 synchronous machine

[0081] 706 Stator

[0082] 800 manufacturing processes

[0083] 802 Deployment Step

[0084] 804 Arranging step

[0085] 900 motor vehicles

[0086] 901 wheels

[0087] 903 electrical energy storage

[0088] 905 electric axle drive

[0089] 907 power converters

[0090] 909 transmission device

Claims

Patent claims 1. Rotor (100) for a synchronous machine (700), wherein the synchronous machine (700) is designed as an electrically excited synchronous machine, wherein the rotor (100) is designed as a salient pole rotor, characterized in that the rotor (100) has a plurality of U-shaped bent laminated cores (120), a support element (110) for supporting the laminated cores (120), and a peripheral element (130) shaped to hold the laminated cores (120) on the support element (110), wherein the laminated cores (120) are arranged between the support element (110) and the peripheral element (130), wherein the laminated cores (120) are arranged adjacent to one another in the circumferential direction of the rotor (100) to form a rotor yoke of the rotor (100) and a plurality of rotor teeth (124; 224; 424) of the rotor (100), wherein each of the laminated cores (120) comprises a plurality of grain-oriented electrical sheets (122) which are stacked radially on one another with respect to the rotor (100).

2. Rotor (100) according to claim 1, characterized in that the electrical sheets (122) of the laminated cores (100) extend in the radial direction in the region of the rotor teeth (124; 224; 424) with respect to the rotor (100) and extend in the tangential direction with respect to the rotor (100) in the region of the rotor yoke.

3. Rotor (100) according to one of the preceding claims, characterized in that the rotor (100) has a plurality of pole shoes (250), wherein a pole shoe (250) is arranged on each rotor tooth (224; 424), and / or wherein the pole shoes (250) are electrically insulated from the laminated cores (120).

4. Rotor (100) according to claim 3, characterized in that the pole shoes (250) are arranged between the laminated cores (120) and the peripheral element (130), wherein the peripheral element (130) is shaped to hold the pole shoes (250) on the laminated cores (120), wherein the pole shoes (250) comprise a soft magnetic composite material or a plurality of grain-oriented or non-grain-oriented electrical sheets which are stacked axially on one another with respect to the rotor (100).

5. Rotor (100) according to claim 3, characterized in that the pole shoes (250) are formed integrally with the peripheral element (130), wherein the pole shoes (250) and the peripheral element (130) comprise a plurality of grain-oriented or non-grain-oriented electrical sheets which are axially stacked on one another with respect to the rotor (100).

6. Rotor (100) according to one of the preceding claims, characterized in that the electrical sheets (122) of the laminated cores (120) have the same dimensions or different dimensions.

7. Rotor (100) according to one of the preceding claims, characterized in that the carrier element (110) has a star-shaped outline and / or a non-magnetic material, wherein star tips of the carrier element (110) extend at least a partial distance radially outwardly towards the rotor teeth (124; 224; 424) and / or are designed in a segmented manner.

8. Rotor (100) according to one of the preceding claims, characterized in that at least one cavity is arranged within the carrier element (110) and / or between the carrier element (110) and the laminated cores (120), and / or wherein the cavity is shaped to conduct a cooling fluid for cooling the rotor (100).

9. Rotor (100) according to one of the preceding claims, characterized in that the rotor (100) has a plurality of coils (140), wherein each coil (140) is arranged on one of the rotor teeth (124; 224; 424) and / or is designed as a separately manufactured air coil.

10. Synchronous machine (700) with a stator (706) and a rotor (100) rotatably mounted relative to the stator (706), characterized in that the rotor (100) is designed according to one of the preceding claims.

11. Electric axle drive (905) for a motor vehicle (900) with at least one synchronous machine (700), a transmission device (909) and a power converter (907), characterized in that the synchronous machine (700) is designed according to claim 10.

12. Motor vehicle (900), comprising an electric axle drive (905) according to claim 11 and / or a synchronous machine (700) according to claim 10 and / or a rotor (100) according to one of claims 1 to 9.

13. A method (800) for manufacturing a rotor (100) according to any one of claims 1 to 9, wherein the method (800) comprises the following steps: Providing (802) the laminated cores (120), wherein the electrical sheets (122) are stacked, cut to size and pressed into a U-shape; and Arranging (804) the laminated cores (120) between the support element (110) and the peripheral element (130).

14. The method (800) according to claim 13, characterized in that in the step (802) of providing, the electrical sheets (122) are first stacked and subsequently pressed as a stack or first pressed individually and subsequently stacked.

15. Method (800) according to one of claims 13 to 14, characterized in that in the step (802) of providing, the electrical sheets (122) are cut to size before or after pressing.

Images