Rotor lamination, electric machine, electric axle drive, and motor vehicle

Abstract

A rotor lamination (100) for an electric machine (105) of a motor vehicle comprises a first groove region (110), a second groove region (120) and a third groove region (120). The groove regions (110, 120, 130) are or can be located at an outer circumference of the rotor lamination (100). The first groove region (110) and the second groove region (120) are located at a first angle (145) with respect to a center of the rotor lamination (100). The second groove region (120) and the third groove region (130) are located at a second angle (150) with respect to the center of the rotor lamination (100), the second angle (150) being different from the first angle (145).

Description

[0001] Rotor sheet, electric machine, electric axle drive and motor vehicle

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

[0003] Electrical machines are known that can have a skew to reduce torque ripple.

[0004] Against this background, the present invention provides an improved rotor lamination, an improved electric machine, an improved electric axle drive, and an improved motor vehicle according to the main claims. Advantageous embodiments emerge from the subclaims and the following description.

[0005] The advantages achievable with the approach presented here are, in particular, that a rotor lamination can be created that enables a reduction of torque ripples.

[0006] A rotor lamination for an electric machine of a motor vehicle has a first groove region, a second groove region, and a third groove region. The groove regions are arranged or can be arranged on an outer circumference of the rotor lamination. The first groove region and the second groove region are arranged at a first angle with respect to a center of the rotor lamination. The second groove region and the third groove region are arranged at a second angle with respect to the center of the rotor lamination, wherein the second angle differs from the first angle.

[0007] The electric machine can be designed as an electrically excited synchronous machine and drive the motor vehicle, wherein the motor vehicle can be designed as an electrically powered motor vehicle. The rotor lamination can be part of a rotor, wherein the rotor can be a movable, rotating part of an electric machine. The rotor can be designed as a solid-pole rotor. The rotor lamination can also be understood as an electrical lamination, which can be used, for example, as an iron core for a coil. The rotor lamination can be designed to be soft magnetic and can therefore be magnetized, for example, when the coil is energized. Additionally or alternatively, the rotor lamination can be used as an iron core for a permanent magnet. By using the rotor lamination, heating of the electric machine can be avoided or reduced. Magnetic fields can therefore be generated reliably. The rotor orThe electric machine can have a plurality of rotor laminations. A rotor lamination can also be understood as a package or stack of rotor laminations. The slot regions can have a plurality of slots, wherein the slots can be shaped as slots. The slot regions can be designed to reliably guide field lines of at least one magnetic field. More precisely, the slot regions or the slots can act as a barrier to prevent the rotor from locking into the stator under different currents. The slot regions can also be understood as barriers, which can also contain air or plastics, among other things. Their main function can be seen as accommodating a DC excitation winding, which generates a magnetic field in the rotor and thus the poles (analogous to the magnets in a permanent magnet synchronous machine). For example, the slots for this purpose can also contain air or a plastic material.The approach presented here eliminates the need for chamfering the rotor lamination, which saves costs and time. Furthermore, damage to the rotor lamination during manufacturing can be avoided.

[0008] The rotor lamination may have at least a fourth groove region, which may be arranged at a third angle to the first groove region with respect to the center of the rotor lamination. In particular, the third angle may correspond to the first angle. Thus, torque ripple can be reliably reduced.

[0009] The first slot region, the second slot region, and the third slot region can be arranged cyclically and repeatedly along an outer circumference of the rotor lamination. This allows the torque ripple to be reliably reduced. It should be noted that the examples described below are given for an eight-pole machine (i.e., having eight main teeth (poles) between eight slot regions). In this case, however, the machine can also have a different number of poles (e.g., at least four), which are divided into pole groups. However, there should be at least four poles / slot regions. The examples of the eight-pole machine show variants with four and two pole groups.

[0010] For example, a six-pole machine could have three pole groups (each with 2 poles / slot areas) or 2 pole groups (each with three poles / slot areas), etc.

[0011] The first slot region, the second slot region, and the third slot region can be arranged such that the rotor lamination can exhibit point symmetry (especially with respect to the slot regions). Thus, the torque ripple can be reliably reduced.

[0012] A section of the outer circumference of the rotor lamination between a groove of the first groove region and a groove of the second groove region can be greater than a section of the outer circumference between a groove of the second groove region and a groove of the third groove region. Such an embodiment also allows the advantages of the approach described here to be realized very efficiently.

[0013] The outer circumference distance between a groove of the first groove region and the second groove region can be the same, and the outer circumference distance between a groove of the second groove region and a groove of the third groove region can be the same. This can reliably reduce torque ripple of the electric machine.

[0014] The angle between slots in the first slot area can differ from the angle between slots in the second slot area. This can reliably reduce torque ripple in the electric machine.

[0015] The angle between the grooves of the first groove area and the angle between the grooves of the second groove area can be the same. This embodiment also allows the advantages of the approach described here to be realized very efficiently.

[0016] The grooves of the first groove region, the second groove region, and the third groove region can each be arranged symmetrically around a groove region center. Such an embodiment also allows the advantages of the approach described here to be realized very efficiently.

[0017] The first angle and, additionally or alternatively, the second angle can each be determined relative to a groove area center of the first groove area and, additionally or alternatively, the second groove area and, additionally or alternatively, the third groove area. Thus, the torque ripple can be reliably reduced.

[0018] An electric machine may comprise an embodiment of a rotor lamination mentioned herein. Such an embodiment can also very efficiently realize the advantages of the approach described here.

[0019] An electric axle drive for a motor vehicle comprises an embodiment of an electric machine mentioned herein, a transmission device, and a power converter. The power converter can be embodied as an inverter. Using the inverter, an alternating electrical current required to operate the electric machine can be provided. Using the transmission device, a torque provided by the electric machine can be converted into a drive torque for driving at least one wheel of the motor vehicle. The transmission device can comprise a gearbox for reducing the speed of the electric machine and, optionally, a differential.

[0020] A motor vehicle has an embodiment of a rotor lamination mentioned herein and, additionally or alternatively, an embodiment of an electric axle drive mentioned herein and, additionally or alternatively, an embodiment of an electric machine mentioned herein. The motor vehicle can be designed as an electrically powered motor vehicle. Such an embodiment also allows the advantages of the approach described herein to be realized very efficiently.

[0021] The invention is explained in more detail by way of example with reference to the accompanying drawings. Therein: Fig. 1 shows a schematic representation of an embodiment of a rotor lamination; Fig. 2 shows a schematic representation of an embodiment of a rotor lamination; Fig. 3 shows a schematic representation of an embodiment of a rotor lamination; Fig. 4 shows a schematic representation of an embodiment of a rotor lamination; Fig. 5 shows a schematic representation of an embodiment of a rotor lamination; and

[0022] Fig. 6 is a schematic representation of an embodiment of a motor vehicle.

[0023] In the following description of preferred embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and having a similar effect, whereby a repeated description of these elements is omitted.

[0024] Before discussing preferred embodiments of the present invention below, the background and principles of embodiments will first be briefly explained:

[0025] Electrical machines exhibit torque ripple due to interactions between the stator and rotor. Depending on the design, this ripple is more or less pronounced. This torque ripple can be reduced by skew of the electrical machine. Skew can be implemented in both the stator and the rotor of a machine. Skews are divided into continuous and discrete. Discrete skew means an axial division of the laminated core into different segments that are offset tangentially to one another. Continuous skew, in contrast, describes a continuous axial offset of all laminations from one another. This makes it possible for components with electrical conductors, which allows the technology to be used in stators, but also in the rotors of induction machines or electrically excited synchronous machines.Discrete skew is used for rotors of permanent magnet synchronous machines or for pure reluctance machines. To apply the skew principle to electrically excited synchronous machines, either the stator or the rotor of the machine is continuously skewn. To reduce the torque ripple in permanent magnet synchronous machines through what is known as quasi-skew, the magnets are grouped together and distributed locally asymmetrically around the circumference of the rotor. Magnets within a group are spaced a different distance apart than groups of magnets are spaced apart. This achieves the same effect as with conventional axial skew or offset segments, but without changing the cross-section along the axial length. For electrically excited synchronous machines, in contrast, only continuous skew of the stator or rotor has been used to date, in which all the segments are offset from one another.

[0026] With reference to the following figures, an improved electrical machine or an improved rotor lamination according to embodiments is explained in more detail.

[0027] Fig. 1 shows a schematic representation of an embodiment of a rotor lamination 100 for an electrical machine 105. The rotor lamination 100 is, for example, a part of the electrical machine 105. According to one embodiment, the electrical machine 105 additionally has a stator 103 that is mounted in a rotationally fixed manner. The rotor lamination 100 is, for example, mounted rotatably relative to the stator 103. In this case, the rotor lamination 100, according to the embodiment shown here, is arranged on the inside, and the stator 103 is arranged on the outside. Arranged centrally, purely by way of example, is a shaft 113 that is designed as a drive shaft or as an output shaft that is connected or connectable to the rotor lamination 100.

[0028] The rotor lamination 100 has a first groove region 110, a second groove region 120, and a third groove region 130. The groove regions 110, 120, 130 are radially aligned and arranged adjacent to one another. The second groove region 120 is arranged, for example, between the first groove region 110 and the third groove region 130. Each groove region 110, 120, 130 has, for example, four grooves 115, 125, 135. The first groove region 110 has four first grooves 115, the second groove region 120 has four second grooves 125, and the third groove region 130 has four third grooves 135. The grooves 115, 125, 135 are formed, for example, as rectangular slots and are radially aligned. More precisely, the grooves 115, 125, 135 of the groove regions 110, 120, 130 are arranged in the direction of an outer circumference of the rotor lamination 100. The grooves 115, 125, 135 are adjacent to a gap 140, which, for example, separates the rotor lamination 100 from the stator 103.

[0029] The groove areas 110, 120, 130 are designed, for example, to guide field lines of at least one magnetic field. The grooves 115, 125, 135 function, for example, as a receptacle for an excitation winding for field generation. The positioning of the grooves serves the purpose of guiding the magnetic flux along an optimal path.

[0030] According to the embodiment shown here, the grooves 115, 125, 135 of the groove regions 110, 120, 130 are each spaced at the same distance from one another. However, the groove regions 110, 120, 130 are arranged radially at different angles to one another.

[0031] More precisely, the first groove region 110 and the second groove region 120 are arranged radially to one another at a first angle 145, and the second groove region 120 and the third groove region 130 are arranged radially to one another at a second angle 150. The angles 145, 150 differ. More precisely, the first angle 145 is greater than the second angle 150. The first angle 145 is illustrated by way of example by means of a double arrow and can be referred to as α. The second angle 150 is also illustrated by way of example by means of a double arrow and can be referred to as β. The first angle 145 is arranged, for example, along a groove region center 155 of the first groove region 110 and a groove region center 160 of the second groove region 120. The second angle 150 is arranged, for example, along the groove area center 160 of the second groove area 120 and a groove area center 165 of the third groove area 130.The groove area centers 155, 160, 165 are shown by way of example using dashed lines and each run radially centrally through the respective groove area 110, 120, 130. The dashed lines of the groove area centers 155, 160, 165 extend only by way of example starting from the shaft 113, with an xy-axis 170 representing an example of the course of the angles 145, 150.

[0032] A first section 175 is arranged between the first groove region 110 and the second groove region 120, and a second section 180 is arranged between the second groove region 120 and the third groove region 130. The first section 175 is larger than the second section 180. More precisely, the first section 175 extends along the outer circumference of the rotor lamination 100 between the first groove region 110 and the second groove region 120. The second section 180 extends, for example, along the outer circumference of the rotor lamination 100 between the second groove region 120 and the third groove region 130. Field lines of magnetic fields run, for example, through the sections 175, 180.

[0033] According to the exemplary embodiment shown here, the angles 145, 150 form a group 185, so that, purely by way of example, three further groups 192, 193, 194 are arranged along the rotor lamination 100. The groups 185, 192, 193, 194 are identically designed purely by way of example and have the two angles 145, 150, as well as the three groove regions 110, 120, 130. More precisely, two of the groups 185, 192, 193, 194 share the first groove region 110 and the third groove region 130, since the groove region centers 155, 165 run centrally through the groove regions 110, 130. The rotor lamination 100 is thus divided into four groups 185, 192, 193, 194.

[0034] Fig. 1 thus shows a rotor lamination 100 with different widths of the sections 175, 180, which can also be referred to as pole widths or widths of the main teeth, with a constant distance between the respective slots 115, 125, 136, which can also be referred to as the rotor slot pitch, in the respective slot area 110, 120, 130 of the rotor. It should be mentioned here that this arrangement applies, for example, to an eight-pole machine (as also applies to the following figures), but other numbers of poles would also be conceivable. Furthermore, Fig. 1 also shows a division of the rotor lamination 100, which can also be referred to as the rotor, into four groups. The angular distances from slot area center to slot area center vary with the values ​​α and β.

[0035] In other words, Fig. 1 shows a quasi-skew of solid-pole rotors of electrically excited synchronous machines. Here, paths 175, 180, which can also be referred to as poles, are divided into groups 185, 192, 193, 194, which can also be referred to as pole groups. The paths 175, 180 within a group 185, 192, 193, 194 have a different spacing from one another than the different groups 185, 192, 193, 194 are from one another, creating a locally asymmetrical but globally symmetrical structure. This arrangement makes it possible to reduce the torque ripple of the electric machine 105.

[0036] The principle of quasi-skew is applicable to the rotors or rotor laminations 100 of electrical machines 105, which can also be referred to as electrically excited synchronous machines. Here, too, the sections 175, 180 or slot areas 110, 120, 130 are divided into groups 185, 192, 193, 194, with each group 185, 192, 193, 194 comprising at least two sections 175, 180 or slot areas 110, 120, 130, and all groups having the same number of sections 175, 180 or slot areas 110, 120, 130.

[0037] The advantage of the approach presented here is that it reduces torque ripple without using axial skew. An alternative is conventional axial skew, which involves continuously skew-ing the rotor.

[0038] Fig. 2 shows a schematic representation of an embodiment of a rotor lamination 100 for an electrical machine 105. The rotor lamination 100 is similar to the rotor lamination from Fig. 1 with the exception that the rotor lamination 100 additionally has a fourth groove region 200 and a fifth groove region 225 and that the rotor lamination 100 is divided into two groups 250, 255.

[0039] The rotor lamination 100 has the first groove region 110, the second groove region 120, the third groove region 130, and additionally the fourth groove region 200 and the fifth groove region 225. Each of the groove regions has, for example, four grooves 115, 125, 135, 210, 235. According to one embodiment, a groove region center 155, 160, 165, 205, 230 runs radially centrally through each of the groove regions 110, 120, 130, 200, 225.

[0040] The first groove region 110 and the second groove region 120 are arranged radially to one another at the first angle 145, for example, and the second groove region 120 and the third groove region 130 are arranged radially to one another at the second angle 150. The angles 145, 150 differ. More precisely, the first angle 145 is greater than the second angle 150. The first angle 145 is illustrated by way of example by means of a double arrow and can be referred to as α. The second angle 150 is also illustrated by way of example by means of a double arrow and can be referred to as β. The first angle 145 is arranged, for example, along a groove region center 155 of the first groove region 110 and a groove region center 160 of the second groove region 120. The second angle 150 is arranged, for example, along the groove area center 160 of the second groove area 120 and a groove area center 165 of the third groove area 130.The groove area centers 155, 160, 165 are shown by way of example using dashed lines and each run radially centrally through the respective groove area 110, 120, 130.

[0041] According to one embodiment, the first groove region 110 and the fourth groove region 200 are arranged radially to one another at a third angle 240, and the fourth groove region 200 and the fifth groove region 225 are arranged radially to one another at a fourth angle 245. The angles 240, 245 correspond to the first angle 145. The angles 240, 245 are also represented, for example, by a double arrow and can be designated as α. The fourth angle 240 extends, for example, between the groove region center 155 of the first groove region 100 and the groove region center 205 of the fourth groove region 200. The fifth angle 245 extends, for example, between the groove region center 205 of the fourth groove region 200 and the groove region center 230 of the fifth groove region 225.

[0042] The dashed lines of the groove area centers 155, 160, 165, 205, 230 extend merely by way of example from the shaft 113, with an xy-axis 170 illustrating, by way of example, a course of the angles 145, 150, 240, 245. The first section 175 is arranged between the first groove area 110 and the second groove area 120, and the second section 180 is arranged between the second groove area 120 and the third groove area 130. Furthermore, for example, a third section 215 is arranged between the first groove area 110 and the fourth groove area 200, and a fourth section 220 is arranged between the fourth groove area 200 and the fifth groove area 225.

[0043] The first section 175 is, for example, larger than the second section 180, the third section 215, and the fourth section 220. The sections 180, 215, and 220 are, for example, the same size. More precisely, the first section 175 extends along the outer circumference of the rotor lamination 100 between the first groove region 110 and the second groove region 120. The second section 180 extends, for example, along the outer circumference of the rotor lamination 100 between the second groove region 120 and the third groove region 130. The third section 215 extends between the first groove region 110 and the fourth groove region 200, with the fourth section 220 extending between the fourth groove region 200 and the fifth groove region 225. In general, it should be noted that in Figure 2, the sections 175, 215, and 220 are the same size, while the section 180 is smaller.Nevertheless, the positions can of course be moved or the length ratio can be reversed, provided that a grouping of the lines remains.

[0044] According to the exemplary embodiment shown here, angles 145, 150, 240, 245 form a group 250, so that, merely by way of example, a further group 255 is arranged along the rotor lamination 100. The further group 255 is configured identically to group 250.

[0045] Fig. 2 thus shows a rotor lamination 100 with different widths of the sections 175, 180, 215, 220, which can also be referred to as pole widths or main tooth widths, respectively, while maintaining a constant distance between the respective slots 115, 125, 135, 210, 235, which can also be referred to as the rotor slot spacing, in the respective slot region 110, 120, 130, 200, 225 of the rotor. Furthermore, Fig. 2 shows a division of the rotor lamination 100, which can also be referred to as the rotor, into two groups. The angular distances from slot region center to slot region center vary with the values ​​α and β.

[0046] Fig. 3 shows a schematic representation of an embodiment of a rotor lamination 100. The rotor lamination 100 is similar to the rotor lamination from Fig. 1 with the exception that the groove regions 110, 120, 130 have the same distance from one another and the grooves 115, 125, 135 each have a different distance from one another.

[0047] The rotor lamination 100 has the first groove region 110, the second groove region 120 and the third groove region 130. The grooves 115 of the first groove region 110 and the grooves 135 of the third groove region 130 are arranged at an identical groove angle 300 to one another, wherein the groove angle 300 is shown only as an example for the grooves 115 of the first groove region 110. This groove angle 300 can also be referred to as v and is shown only as an example for the grooves 115 of the first groove region 110. More precisely, two grooves 115 are arranged radially to one another at the groove angle 300. Only as an example, three groove angles 300 are shown in Fig. 3, which result in a groove region angle 305, which can be <p bezeichnet werden kann und lediglich beispielhaft mittels eines Doppelpfeils dargestellt ist.

[0048] The grooves 125 of the second groove region 120 are each arranged radially relative to one another, for example, at a second groove angle 310. The second groove angle 310 can also be referred to as p. For example, three groove angles 310 are shown in Fig. 3, which result in a second groove region angle 315, which can be referred to as s, for example, and is represented purely by way of example by a double arrow. The second groove region angle 315 is, for example, larger than the groove region angle 305. The groove angles 300, 310 and also the groove region angles 305, 315 run, for example, radially centrally through the respective grooves 115, 125.

[0049] The first groove region 110 and the second groove region 120 are arranged at a distance angle 320 to each other, for example, which can also be referred to as θ, for example, and is shown merely by way of example by means of a double arrow. The second groove region 120 and the third groove region 130 are arranged at a further distance angle 325 to each other, with the distance angles 320, 325 being identical.

[0050] The line angles 320, 325 and the groove area angles 305, 315 form the

[0051] Group 185, so that three further groups 192, 193, 194 are arranged along the rotor lamination 100, merely by way of example. Groups 185, 192, 193, 194 are identically constructed merely by way of example. The rotor lamination 100 is thus divided into four groups 185, 192, 193, 194.

[0052] Fig. 3 thus shows a rotor lamination 100 with equal widths of the segment angles 320, 325, which can also be referred to as pole widths or widths of the main teeth, with different spacing of the slots 115, 125, 135, which can also be referred to as rotor slots, in the various slot regions 110, 120, 130 of the rotor lamination 100. Furthermore, Fig. 3 shows a division of the rotor lamination 100 into four groups 185, 192, 193, 194. The segment angles 320, 325 amount to the angle θ in each segment, which can also be referred to as pole. The slot regions 110, 120, 130 vary with the second slot region angle E, which can also be referred to as the region angle - whereby the slots 125 have the second slot angle 310, which can also be referred to as the angular spacing, to one another. - and the groove area angle 305, which can also be referred to as angular range - wherein the grooves 115 have the groove angle 300, which can also be referred to as angular distance, to each other.

[0053] Fig. 4 shows a schematic representation of an embodiment of a rotor lamination 100. The rotor lamination 100 is similar to the rotor lamination from Fig. 2 with the exception that the groove regions 110, 120, 130, 200 have the same distance from one another and the grooves 115, 125, 135, 210 each have a different distance from one another.

[0054] According to the exemplary embodiment shown here, the rotor lamination 100 has the first groove region 110, the second groove region 120, the third groove region 130, and the fourth groove region 200. The grooves 115 of the first groove region 110, the grooves 135 of the third groove region 130, and the grooves 210 of the fourth groove region 200 are arranged at an identical groove angle 300 to one another, wherein the groove angle 300 is shown only as an example for the grooves 135 of the third groove region 130. This groove angle 300 can also be referred to as v and is shown only as an example for the grooves 135 of the first groove region 130. More precisely, two grooves 135 are arranged radially to one another at the groove angle 300. Three groove angles 300 are shown in Fig. 4 purely as an example. The groove angles 300 result in a groove area angle 305, which for the sake of clarity is only shown as an example for the first groove area 110.The groove area angle 305 can be defined, for example, as <p bezeichnet werden und ist lediglich beispielhaft mittels eines Doppelpfeils dargestellt.

[0055] The grooves 125 of the second groove region 120 are each arranged radially relative to one another at a second groove angle 310, for example. For the sake of clarity, the groove angles 310 are shown only as an example for an additional groove region 400 opposite the second groove region 120. The second groove angle 310 can also be referred to as p. Three groove angles 310 are shown in Fig. 4 merely as an example. The second groove angles 310 result in a second groove region angle 315, which, for the sake of clarity, is shown only as an example for the second groove region 120. The second groove region angle 315 can be referred to as s, for example, and is shown merely as an example by means of a double arrow. The second groove region angle 315 is, for example, larger than the groove region angle 305.For example, the groove angles 300, 310 and also the groove area angles 305, 315 run radially centrally through the respective grooves 115, 125, 135, 405.

[0056] The first groove region 110 and the second groove region 120 are arranged, for example, at a distance angle 320 to each other, which can also be referred to as θ, for example, and is shown merely by way of example by means of a double arrow. The second groove region 120 and the fourth groove region 200 are arranged at a further distance angle 325 to each other, wherein the distance angles 320, 325 are identical. The distance angles 320, 325 and the groove region angles 305, 315 form the

[0057] Group 250, so that, merely by way of example, a further group 255 is arranged along the rotor lamination 100. The groups 250, 255 are identically designed merely by way of example. The rotor lamination 100 is thus divided into the two groups 250, 255. Also assigned to the group are the groove areas 200 and the angle relative to the groove area 130, including the segment angles between 200 and the groove area relative to the groove area 130, as well as the segment angle between 400 and the groove area relative to the groove area 130.

[0058] Fig. 4 thus shows a rotor lamination 100 with equal widths of the section angles 320, 325 with different spacings of the slots 115, 125, 135 in the various slot regions 110, 120, 130, 200 of the rotor lamination 100. Furthermore, Fig. 4 shows a division of the rotor lamination 100 into two groups 250, 255. The section angles 320, 325 are the angle θ in each section. The slot regions 110, 120, 130, 200 vary with the second slot region angle α - wherein the slots 135 have the second slot angle 310 to one another - and the slot region angle 305 - wherein the slots 115 have the slot angle 300 to one another.

[0059] Fig. 5 shows a schematic representation of an embodiment of a rotor lamination 100. The rotor lamination 100 is similar to the rotor lamination from Fig. 1 and / or Fig. 3 with the exception that the groove regions 110, 120, 130 have a different distance from one another and the grooves 115, 125, 135 each have a different distance from one another.

[0060] The rotor lamination 100 has the first groove region 110, the second groove region 120 and the third groove region 130. The grooves 115 of the first groove region 110 and the grooves 135 of the third groove region 130 are arranged at an identical groove angle 300 to one another, wherein the groove angle 300 is shown only as an example for the grooves 115 of the first groove region 110. This groove angle 300 can also be referred to as v and is shown only as an example for the grooves 115 of the first groove region 110. More precisely, two grooves 115 are arranged radially to one another at the groove angle 300. Only as an example, three groove angles 300 are shown in Fig. 5, which result in a groove region angle 305, which can be <p bezeichnet werden kann und lediglich beispielhaft mittels eines Doppelpfeils dargestellt ist.

[0061] The grooves 125 of the second groove region 120 are each arranged radially relative to one another, for example, at a second groove angle 310. The second groove angle 310 can also be referred to as p. For example, three groove angles 310 are shown in Fig. 5, which result in a second groove region angle 315, which can be referred to as s, for example, and is represented purely by way of example by a double arrow. The second groove region angle 315 is, for example, larger than the groove region angle 305. The groove angles 300, 310 and also the groove region angles 305, 315 run, for example, radially centrally through the respective grooves 115, 125.

[0062] The first groove region 110 and the second groove region 120 are arranged at a distance angle of 500° to one another, for example, which can also be referred to as α, for example, and is illustrated solely by way of example by a double arrow. The second groove region 120 and the third groove region 130 are arranged at a further distance angle of 325° to one another, which can be referred to as θ, for example, and is also illustrated solely by way of example by way of a double arrow. The distance angle of 500° is larger than the further distance angle of 325°.

[0063] The segment angles 500, 325 and the slot area angles 305, 315 form group 185, so that three further groups 192, 193, 194 are arranged along the rotor lamination 100, merely by way of example. Groups 185, 192, 193, 194 are identically designed merely by way of example. The rotor lamination 100 is thus divided into four groups 185, 192, 193, 194.

[0064] Fig. 5 thus shows a rotor lamination 100 with different widths of the segment angles 500, 325 and different spacing of the slots 115, 125 in the various slot regions 110, 120 of the rotor lamination 100. In other words, Fig. 5 shows a combination of the principles mentioned in Fig. 1 and / or Fig. 3. Furthermore, Fig. 5 shows a division of the rotor lamination 100 into four groups 185, 192, 193, 194. The segment angles 500, 325 vary between the angles δ and α. The slot regions 110, 120 vary with the second slot region angle 315 - whereby the slots 125 have the second slot angle 310 to one another - and the slot region angle 305 - whereby the slots 110 have the slot angle 300 to one another.

[0065] Fig. 6 shows a schematic representation of an embodiment of a motor vehicle 600. The motor vehicle 600 includes wheels 605, four wheels only by way of example, an electrical energy storage device 610, for example a battery, and an electric axle drive 615. The electric axle drive 615 includes a power converter 620, an electric machine 105, and a transmission device 630.

[0066] Electrical energy for operating the electric machine 105 is provided by a power supply device, here the electrical energy storage device 610. The electrical energy storage device 610 is designed to provide direct current, which is converted into an alternating current, for example a three-phase alternating current, using a power converter 620 of the electric axle drive 615 and provided to the electric machine 105. A shaft driven by the electric machine 105 is coupled directly or using the transmission device 630 to at least one wheel 605 of the motor vehicle 600. Thus, the motor vehicle 600 can be propelled using the electric machine 105. According to one exemplary embodiment, the electric axle drive 615 comprises a housing in which the power converter 620, the electric machine 105, and the transmission device 630 are arranged.

[0067] The exemplary embodiments described and shown in the figures are selected only as examples. Different exemplary embodiments can be combined with one another in their entirety or with regard to individual features. Furthermore, an exemplary embodiment can be supplemented by features of another exemplary embodiment. If an exemplary embodiment includes an "and / or" connection between a first feature and a second feature, this can be interpreted to mean that the exemplary embodiment, according to one embodiment, has both the first feature and the second feature, and according to another embodiment, either only the first feature or only the second feature.

[0068] Reference symbol

[0069] rotor sheet

[0070] Stator electric machine first slot area first slot or slots in the first slot area second slot area second slot or slots in the second slot area third slot area third slot or slots in the third slot area

[0071] gap first angle second angle

[0072] Groove area center of the first groove area

[0073] Groove area center of the second groove area

[0074] Groove area center of the third groove area xy-axis first line second line first group second group third group fourth group fourth groove area

[0075] Groove area center of the fourth groove area fourth groove third section fourth section fifth groove area

[0076] Groove area center of the fifth groove area fifth groove third angle fourth angle first group second group

[0077] Groove angle

[0078] Groove range angle second groove angle second groove range angle

[0079] Line angle additional line angle additional groove area additional groove

[0080] Distance angle

[0081] vehicle

[0082] Wheels electric energy storage electric axle drive

[0083] power converter

[0084] Gearbox

Claims

Patent claims 1. A rotor lamination (100) for an electric machine (105) of a motor vehicle (600), wherein the rotor lamination (100) has a first groove region (110), a second groove region (120), and a third groove region (130), which are arranged or can be arranged on an outer circumference of the rotor lamination (100), wherein the first groove region (110) and the second groove region (120) are arranged at a first angle (145) with respect to a center of the rotor lamination (100), and the second groove region (120) and the third groove region (130) are arranged at a second angle (150) with respect to the center of the rotor lamination (100), wherein the second angle (150) differs from the first angle (145).

2. Rotor lamination (100) according to claim 1, with at least one fourth groove region (200) which is arranged at a third angle (240) to the first groove region (110) with respect to the center of the rotor lamination (100), in particular wherein the third angle (240) corresponds to the first angle (145).

3. Rotor lamination (100) according to one of the preceding claims, wherein the first groove region (110) and the second groove region (120) and the third groove region (130) are arranged cyclically repeatedly along the outer circumference of the rotor lamination (100).

4. Rotor lamination (100) according to claim 3, wherein the first groove region (110) and the second groove region (120) and the third groove region (130) are arranged such that the rotor lamination (100) has a point symmetry.

5. Rotor lamination (100) according to one of the preceding claims, wherein a distance (175) of the outer circumference between a groove (115) of the first groove region (110) and a groove (125) of the second groove region (120) is greater than a distance (180) of the outer circumference between a groove (125) of the second groove region (120) and a groove (135) of the third groove region (130).

6. Rotor sheet (100) according to claims 1 to 4, wherein the distance (175) of the outer circumference between a groove (115) of the first groove region (110) and a groove (125) of the second groove region (120) and the distance (180) of the outer circumference between a groove (125) of the second groove region (120) and a groove (135) of the third groove region (130) are equal.

7. Rotor lamination (100) according to one of the preceding claims, wherein an angle (300) between grooves (115) of the first groove region (110) differs from an angle (310) between grooves (125) of the second groove region (120).

8. Rotor lamination (100) according to claim 1 to 6, wherein the angle (300, 305) between grooves (115) of the first groove region (110) and the angle (310, 315) between grooves (125) of the second groove region (120) are the same.

9. Rotor lamination (100) according to claim 8, wherein the grooves (115, 125, 135) of the first groove region (110) and the second groove region (120) and the third groove region (130) are arranged symmetrically about a groove region center (155, 160, 165).

10. Rotor lamination (100) according to claim 9, wherein the first angle (145) and / or second angle (150) is / are each determined relative to the groove region center (155, 160, 165) of the first groove region (110) and / or the second groove region (120) and / or the third groove region (130).

11. An electrical machine (105) comprising a rotor lamination (100) according to any one of the preceding claims 1 to 10.

12. Electric axle drive (615) for a motor vehicle (600) with an electric machine (105) according to claim 11 and a transmission device (630) and a power converter (620).

13. Motor vehicle (600) with a rotor plate (100) according to claims 1 to 10, with an electric axle drive (615) according to claim 12 and / or an electric machine (105) according to claim 11.

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