AT525718B1 - rotor - Google Patents

Abstract

The invention relates to a rotor (3) with a shaft (4) and with at least one lamella (5) which is arranged on the shaft (4), the lamella (5) having an opening (7) through which the shaft (4) is passed through, and wherein the lamella (5) has a first connecting element (8) which cooperates with a second connecting element (9) formed on the shaft (4), and wherein in the radial direction (12) above the first connecting element ( 8) an opening (10) is formed in the lamella (5), so that the first connecting element (8) is resiliently deformable. The first connecting element (8) has two contact points or contact areas with the shaft (4) which are spaced apart from one another in the circumferential direction.

Description

Description

The invention relates to a rotor with a shaft and with at least one lamella which is arranged on the shaft, the lamella having an opening through which the shaft is passed, and the lamella having a first connecting element which is connected to a second connecting element formed on the shaft cooperates.

The invention further relates to an electrical machine comprising a stator and a rotor.

To connect the sheet metal lamellae to the rotor shaft of an electric motor, it is known to use deformable shaped elements. For example, DE 10 2007 032 138 A1 describes a method for fastening a lamination or rotor laminated core on a rotor shaft or a rotor carrier of a rotor of an electrical machine and a rotor for an electrical machine, wherein the lamella or rotor lamination stack is non-positively connected to the rotor shaft or the rotor carrier is/is connected. It is envisaged that the lamination or rotor laminated core is provided with protruding projections on an inner or outer circumferential surface and then pressed onto the rotor shaft or the rotor carrier with plastic deformation of the projections or pressed into an opening in the rotor carrier, so that the circumferential surface then is provided with protruding plastically deformed projections which rest with a press fit against an opposite cylindrical circumferential surface of the rotor shaft or the rotor carrier and connect the lamella or rotor laminated core to the rotor shaft or the rotor carrier without positive locking.

[0004] EP 3 172 815 B1 describes a rotor for an electric motor with a shaft and with a plurality of slats which are accommodated on the shaft and wherein the slats have an internal passage through which the shaft is passed, so that the slats pass over the internal passage are centered on the shaft. The slats have spring tongues formed in the inner passage, which are braced with a bracing force in the circumferential direction with at least one counter geometry formed on the shaft.

[0005] DE 10 2013 102 822 A1 describes an electric motor comprising a stator, a rotor arranged rotatably in the stator, which has a laminated core in which at least one first recess and at least one second recess are provided, the first recess being a rotor magnet arranged therein is assigned, wherein the second recess is assigned a clamping element arranged therein, a clamping member being provided between the first recess and the second recess, and wherein the clamping element and the second recess are designed to support the clamping element on the laminated core enable, and to apply a force to the clamping member in the direction of the rotor magnet in order to clamp the rotor magnet in the first recess.

[0006] From EP 2 835 888 A?2 a rotor component for a rotor of a rotating electrical machine is known, the component defining: a bore for receiving a shaft, which defines an axis of rotation for the rotor component; a plurality of salient poles arranged around the bore; one or more grooves extending axially through the rotor component, each groove having a circumferential size greater than its largest radial size; and a respective bridge portion of the rotor component located between each groove and the bore and proportioned such that a pressure exerted by the respective bridge portion on a shaft in the bore increases as the rotor component is rotated about the axis of rotation, each bridge portion in Generally located between two adjacent poles.

[0007] DE 10 2009 047 485 A1 describes an electrical machine with a rotor and a shaft, wherein the rotor has at least one lamella which is fitted onto the shaft and connected to the shaft, and wherein the lamella has a central one in a fastening area Has a receiving hole through which the shaft extends, with the lamella in the fastening

supply area has at least one relief recess.

[0008] From DE 10 2006 046 231 A1 a rotor plate of a rotor of an electric motor is known, which has a center of gravity and, with respect to the center of gravity, an inner contour and an outer contour, the inner contour having a radial distance from the center of gravity which corresponds to a center of gravity and a reference direction-related tangential angle varies between a minimum value and a maximum value, the outer contour having a radial distance from the center of gravity which, regardless of the tangential angle, is greater than the maximum value of the radial distance of the inner contour from the center of gravity, with tangential angles at which the radial distance of the inner contour from the center of gravity Assumes minimum value, intermediate recesses are introduced into the rotor laminations near the inner contour, so that an elastically yielding web remains between the respective intermediate recess and the inner contour.

DE 10 2008 038 726 B3 describes a fastening of a rotor body on a shaft, wherein the rotor body is stacked from individual sheets and has a polygonal central opening for inserting the shaft, and at least one bending element is arranged on at least one polygonal side of the central opening , which has line contact with the shaft and is deflected by pressing the shaft into the central opening.

[0010] WO 2011/096052 A1 describes a rotor with a rotor core, a rotor shaft mounted in the shaft mounting hole of the rotor core, and a connection structure connecting the rotor core and the rotor shaft. In the connection structure, the inner circumference of the shaft fixing hole and the outer circumference of the rotor shaft are irregularly shaped in a plan view. The irregular shape of the inner circumference of the shaft mounting hole is essentially a polygon and includes: circular arc portions corresponding to the corners of the polygon and centered on the rotation axis of the rotor core; and flat sections each connected to ends of adjacent circular arc sections. The irregular shape of the outer periphery of the rotor shaft is essentially a polygon and includes: circular arc portions corresponding to the corners of the polygon and centered on the axis of rotation of the rotor shaft; and flat sections respectively connected to ends of each of the circular arc sections. A part of each flat portion in the irregular shape of the inner circumference of the shaft fixing hole or a part of each flat portion in the irregular shape of the outer circumference of the rotor shaft forms a recess.

JP 2006/254662 A describes a rotor comprising a first tube section attached to a shaft, a second tube section arranged outside the first tube section, and a rib section for attaching the first tube section and the second tube section to one another. The first tube section and the second tube section are arranged at a distance from one another. The rotor is configured to include a first cavity portion surrounded by the first tube portion, the second tube portion, and the fin portion.

The present invention is based on the object of creating a possibility for compensating for the influence of centrifugal force on the connection of the sheet metal lamellas to the rotor shaft of a rotor mentioned above for an electrical machine.

The object of the invention is achieved in the rotor mentioned at the outset in that the first connecting element has two contact points or contact areas with the shaft which are spaced apart from one another in the circumferential direction.

[0014] Furthermore, the object of the invention is achieved in the electric motor mentioned at the outset in that it has the rotor according to the invention.

The advantage here is that with this design of the rotor a combination of force-fitting and positive connection can be achieved, with the remaining section of the lamella resting on the shaft having a certain spring elasticity due to the breakthrough. On the one hand, this in turn enables at least partial compensation of the centrifugal force acting on this section. On the other hand, it can also be a cost-effective variant

Connection of the lamella to the rotor shaft can be achieved, as the shape of the lamella can be easily obtained with a cutting tool. Due to the spring elasticity, a temperature difference between the shaft and the lamella is also necessary when joining the lamella. This also makes it easier to dismantle the slat. Due to the elastically active element, the connection of the lamella can be designed to be prestressed, which means that any play that may occur between the lamella and the shaft due to the influence of centrifugal force can be compensated for.

The first connecting element has two contact points or contact areas with the shaft that are spaced apart from one another in the circumferential direction. Through this design of the non-positive portion of the connection between the slat and shaft, a centering effect for the slat can be achieved.

According to an embodiment variant of the invention it can be provided that the opening in the lamella is at least approximately crescent-shaped. With this embodiment variant, the resilient effect of the first connecting element can be further improved, especially if, according to a further embodiment variant of the invention, the first connecting element is designed in an arcuate manner. The latter embodiment variant can also better avoid the expansion of the lamella under the influence of centrifugal force.

If the non-positive component cannot be limited to contact points, but rather is designed as a contact area, according to a further embodiment variant of the invention it can be provided that the contact areas each extend over a length that is between 0.1% and 10% of the total length of the first connecting element is. By maintaining this length range for the contact areas, a reduction in the spring-elastic behavior of the first connecting element can be better avoided. This targeted design of the contact surface limits the plastic behavior to a minimum and the force is essentially transmitted through spring-elastic behavior.

The centering effect mentioned is supported if, according to an embodiment variant, normals through the contact points or contact areas have a course that deviates from the radial direction and intersect with a cutting angle outside the center of the shaft - viewed in the axial direction. This makes it possible to achieve a speed-independent connection between the lamella and the shaft for torque transmission and centering of the lamella, since the connecting force is not directed exactly, but only approximately in the radial direction and also in the circumferential direction.

This effect can be enhanced if, according to an embodiment variant of the invention, the intersection angle of the normal is between 5 ° and 90 °.

To improve the resilient behavior of the first connecting element, another embodiment variant can provide that the first connecting element has a radial width of a maximum of 40% of the radial width of the lamella.

The connection of the lamella to the shaft can be further improved and the lifting of the lamella from the shaft can be further reduced if, according to a further embodiment variant of the invention, a radial distance is formed between the first connecting element and the second connecting element outside the contact points or the contact areas is, wherein the radial distance is between 0.1% and 5% of a radial height of the second connecting element.

To make it easier to mount the lamella on the shaft, according to an embodiment variant of the invention, the second connecting element, viewed in cross section, can be designed to be hump-shaped, semi-cylindrical, semi-eliptical, parabolic, lens-shaped, ramp-shaped, trapezoidal, triangular or polygonal.

[0024] According to a further embodiment variant of the invention, it can be provided that the first connecting element has a thickness in the axial direction between 50% and 100% of the thickness of the lamella in the same direction, in order to also ensure that the mount can be mounted.

to improve melle on the wave.

Although it is possible to form only one connection area between the lamella and the shaft, it is advantageous in order to avoid the lamella expanding if, according to an embodiment variant of the invention, a plurality of first connecting elements are distributed over the circumference of the lamella and over the circumference of the shaft Several second connecting elements are arranged distributed.

For a better understanding of the invention, it will be explained in more detail using the following figures.

[0027] They show in a highly simplified, schematic representation:

1 shows an electrical machine in longitudinal section;

2 shows a section of a rotor in a front view;

3 shows an enlarged detail of the section according to FIG. 2;

4 shows an embodiment variant of a second connecting element in a front view;

5 shows a further embodiment variant of a second connecting element in an end view;

6 shows a further embodiment variant of a second connecting element in an end view.

As an introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numbers or the same component names, whereby the disclosures contained in the entire description can be transferred analogously to the same parts with the same reference numbers or the same component names. The position information selected in the description, such as top, bottom, side, etc., is also related to the figure directly described and shown and, in the event of a change in position, these position information must be transferred accordingly to the new position.

1 shows a simplified representation of an electrical machine 1 in the form of an electric motor. The electrical machine 1 includes a stator 2 and a rotor 3. The rotor 3 is arranged radially within the stator 2, that is to say surrounded by the stator 2. Furthermore, the rotor 3 has a shaft 4 on which it is arranged in a rotationally fixed manner or with which it is connected in a rotationally fixed manner.

It should be noted that the electrical machine 1 according to FIG. 1 is only to be understood as an example. The electrical machine 1 can also be designed differently, for example as an axial flux machine. In this case, the stator 2 is arranged in the axial direction next to the rotor 3 and not surrounding it. In addition, the electrical machine 1 can also have more than one stator 2 and/or more than one rotor 3. Furthermore, the electrical machine 1 does not necessarily have to be an electric motor, but can also be designed as a generator, for example.

The electrical machine 1 is also shown in a simplified manner in that the windings or coils are not shown, since this structure is known from the relevant prior art. For further details of such electrical machines 1, please refer to this relevant prior art.

The rotor 3 has at least one lamella 5. However, the rotor 3 preferably has a plurality of disks 5, which are combined to form a disk pack (also referred to as a laminated core). It is further preferred that all slats 5 of the rotor 3 are formed, so that the following statements, which are directed at one slat 5, can also be transferred to all other slats 5.

The lamella 5 has or consists of a lamella body 6 (see FIG. 2) made of a metal sheet, in particular a so-called electrical sheet. Such electrical sheets are known per se, so further discussions are unnecessary. These are usually iron alloys containing, among other things, silicon.

To enable the lamella 5 to be arranged on the shaft 4, the lamella body 6 has an opening 7, which is centrally designed and through which the shaft 4 extends. In other words, the lamella 5 is at least approximately circular.

As already stated, the lamella 5 is arranged on the shaft 4 in a rotationally fixed manner, so that when the shaft 4 rotates, the lamella 5 also rotates. For this purpose, on the one hand, the lamella 5 has a first connecting element 8 and the shaft 4 has a second connecting element 8 which interacts with this first connecting element 8, as can be seen from FIGS. 2 and 3. The first connecting element 8 of the slat 5 is preferably formed in one piece with the remaining slat body 6.

The first connecting element 8 of the lamella 5 is designed as a spring-elastic shaped element. To provide the spring elasticity, an opening 10 is formed in the radial direction above the first connecting element 8 in the lamella 5, i.e. in the lamella body 6.

The opening 10 is completely surrounded or limited by the material of the lamella 5, i.e. completely by the lamella body 6, as can be seen from FIG. In other words, the breakthrough 10 is not designed in the form of an open groove.

The breakthrough 10 means that the first connecting element 9 can move into this breakthrough 10 when the lamella 5 is mounted on the shaft 4. The first connecting element 9 is also prestressed (in the circumferential direction 11 of the lamella 5). It should be mentioned that the slat 5 can be installed without heating it.

Within the scope of the invention, it is also possible to arrange or form several such openings for a first connecting element 8 one above the other in the radial direction 12 and/or the circumferential direction 11 next to one another in the lamella body 6.

As can be seen from Fig. 2, the opening 10 is preferably at least approximately sickle-shaped or boomerang-shaped (in view of the axial end face of the lamella 5). This means that the opening 10 has two sections 13, 14 which are arranged at an angle 15 to one another. The angle 15 is measured between the center lines through the sections 13, 14, as can be seen in FIG. The angle 15 between the sections 13, 14 can be between 30 ° and 170 °, for example 45 ° to the center line.

[0047] Preferably, the two sections 13, 14 are of the same design, in particular also of the same length.

[0048] Furthermore, one end region or both end regions can be rounded. It is also possible for a width 16 of the sections 13, 14 to be bleached equally over their entire length - possibly with the exception of the end regions.

[0049] However, the breakthrough 10 can also have a different shape. For example, the opening 10 can run in a straight line, i.e. the angle 15 between the sections 13, 14 can be 180 °. Furthermore, the opening 10 can be shaped for the engagement of auxiliary tools for mounting the slat 5.

Furthermore, the opening 10 can extend exactly in the circumferential direction, differently than shown, so that the opening 10 has the same distance from the center of the lamella 5 at every point - possibly with the exception of the rounded end regions.

[0051] Furthermore, the width 16 can change over the longitudinal course of the opening 10 or the two sections 13, 14, so that the opening 10 becomes wider or narrower. For example, a central region of the opening 10 can be made wider than the two end regions, as indicated by dashed lines in FIG. 2, or the opening can be shaped in such a way that the remaining cross section of the lamella 5 is stress-optimized.

It is further preferred if all corner regions of the opening 10 are provided with curves or are rounded, so that the opening 10 does not have any sharp corners that could possibly have a notch effect.

Although the shape of the opening 10 shown in FIG. 2 is the preferred one, the opening 10 can also be designed differently as long as it enables the resilient functionality of the first connecting element 8. For example, it can be round, oval, polygonal, etc., each viewed from the front side.

[0054] The breakthrough 10 can be cut or punched from the lamella body 6 using a cutting tool, in particular simultaneously with the production of the lamella body 6 itself, so that the breakthrough 10 can be produced from a sheet metal blank using the tool for the production of the lamella body 6 can.

[0055] According to an embodiment variant of the lamella 5, the first connecting element 8 is designed in a strip-shaped or arc-shaped manner. This first connecting element 8 also preferably does not follow the circumferential direction 11 exactly with its course, but rather has a central region 17 at a greater radial distance from the center of the slat 5 than immediately adjacent sections 18, 19 of the first connecting element 8. This creates between the first Connecting element 8 of the lamella 5 and the second connecting element 9 of the shaft 4 have a free space 20, as can be seen better from FIG.

The two sections 19, 20 of the first connecting element 8 are preferably of the same design, in particular also of the same length, so that the first connecting element 8 is preferably designed symmetrically. The breakthrough 10 is also preferably designed symmetrically.

In principle, the first connecting element 8 can also have a different shape, as long as its functionality of elastic deformability is guaranteed.

The first connecting element 8 is arranged in the radial direction, in particular immediately adjacent to the second connecting element 9, and is therefore part of the inner circumference of the at least approximately annular lamella 5. This at least approximately refers to the central section forming the free space 20 caused by the deviation from the circular shape of the inner circumference of the lamella 5.

The two sections 18, 19 of the first connecting element 8 are preferably of the same length. The length is measured at half the radial height of the connecting element 8. In particular, the first connecting element 8 can be designed symmetrically.

In the case of the lamella 5, it is provided that the first connecting element 8 has two contact points or contact areas with the shaft 4, i.e. the second connecting element 9, which are spaced apart from one another in the circumferential direction 11. The second connecting element 9 is part of the shaft 4, in particular formed in one piece with it. In addition, the first connecting element 8 can be designed or arranged not to touch the second connecting element 9.

This can be seen better from FIG. 3. In this Fig. 3, the connection of the lamella 5 to the shaft 4 is shown in an exaggerated manner, i.e. an illustrated spacing of the lamella 5 from the shaft 4 next to the connection area formed via the connecting elements 8, 9 is not present in the real embodiment, but is Slat 5 attaches to shaft 4 in these areas.

[0062] Preferably, the first connecting element 8 rests on the second connecting element 9 at only two points, the contact points. Due to the manufacturing process, a connection area can also be formed. In this case, the two contact areas each have a length 21 which is between 0.1% and 10% of the total length of the first connecting element 8. The total length is the distance that the first connecting element 8 occupies below the opening 10, the beginning and the end being determined via the outermost points of the opening 10, which are determined by radial rays 22 which run through the center of the lamella 5 as can be seen from Fig. 2.

[0063] According to a further preferred embodiment variant of the lamella 5 or the rotor 3, it can be provided that normals 23 pass through the contact points or contact areas

have a course that deviates from the radial direction and intersect outside the center 24 of the shaft 4, and thus also the lamella 5, - viewed in the axial direction and related to the plane (or the axis of rotation of the shaft 5) - with a cutting angle 25. If contact areas are formed, the normals 23 are guided through the middle of the contact areas so that the two resulting partial areas are the same size or the same length.

[0064] The cutting angle 25 can have a value between 0.1° and 120°. In the preferred embodiment variant, however, the cutting angle 25 of the normal 24 has a value between 5° and 90°, in particular between 10° and 45°.

[0065] According to a further embodiment variant of the lamella 5 or the rotor 3, it can be provided that the first connecting element 8 has a radial width 26 of a maximum of 40%, in particular between 5% and 35% or between 10% and 20% radial width 27 of the slat 5. The term “maximum” takes into account that the first connecting element 8 has a course that deviates from the exact circumferential direction 11, and thus the radial width 26 varies over the course in the circumferential direction.

[0066] According to a further embodiment variant of the lamella 5 or the rotor 3, it can be provided that a radial distance 28 is formed between the first connecting element 8 and the second connecting element 9 outside the contact points or the contact areas, the radial distance 28 being between 0 .1% and 5% of a maximum radial height 29 of the second connecting element 9, as can be seen from FIG. The maximum distance 28 defines the maximum height of the free space 20 in the radial direction.

[0067] According to another embodiment variant, it is also possible that the free space 20 formed between the first and second connecting elements 8, 9 in the slat 5 can be shaped for the engagement of auxiliary tools for assembling the slat 5. It is also possible for the above-mentioned radial distance 28 to be larger than stated above.

The second connecting element 9 can, as shown in FIG. The second connecting element 9 can also have a different cross-sectional shape, such as trapezoidal (see Fig. 4), triangular (see Fig. 5), semi-cylindrical (see Fig. 6), semi-eliptical, parabolic, ramp-shaped or polygonal, etc. The ones listed Shapes are to be understood as examples, even if they are preferred embodiment variants. The second connecting element 9 can also have a different cross-sectional shape, in particular if the connection of the lamella 5 to the shaft 4 is achieved with the described (exclusively) two contact points or (exclusively) two contact areas.

The second connecting element 9 can be formed in the axial direction of the shaft 4 with a constant radial height 29, at least in the area of the arrangement of the lamella (s) 5 (i.e. the sheet metal package) on the shaft 4. However, it is also possible that the radial height 29 becomes smaller over the axial course, so that attaching the slats 5 to the shaft 4 can be carried out more easily thanks to this ramp design. It is also possible for the shaft 4 to be formed outside the area of the arrangement of the lamella(s) 5 without the second connecting element 9.

After the first connecting element 8 is preferably produced by cutting from a sheet metal, as explained above, it preferably has a thickness in the axial direction which corresponds to the thickness of the remaining lamella 5. However, it can also be provided that the axial thickness of the first connecting element 8 is reduced, for example by machining, in order to improve the resilient behavior. In this case, the first connecting element 8 may have a thickness in the axial direction of not less than 50% of the thickness of the lamella 5 in the same direction. The first connecting element 8 can therefore have a thickness in the axial direction between 50% and 100% of the thickness of the lamella 5 in the same direction.

[0071] In the foregoing, only a connection area with a first and a two-

th connecting element 8, 9 described. However, it is possible that several such connection areas can be formed or arranged with a first and a second connecting element 8, 9, distributed over the circumference of the lamella 5 or the rotor 3, in particular evenly distributed, for example two or three or four, etc. Preferably, all connection areas are designed the same, so that the above statements can also be transferred to the other connection areas.

[0072] Furthermore, the rotor 3 can also be used in another assembly, for example in a multi-plate clutch. In addition, the first connecting element 8 can be part of a hub which cooperates with the second connecting element 9 formed on the shaft 4, so that a shaft-hub connection with a shaft 4 and with a hub which is arranged on the shaft 4, whereby the hub has a breakthrough through which the shaft 4 is passed, and wherein the hub has a first connecting element 8, which cooperates with a second connecting element 9 formed on the shaft 4, and in the radial direction 12 above the first connecting element 8 in the hub a breakthrough is formed, so that the first connecting element 8 is resiliently deformable, can represent an independent invention.

[0073] For the sake of order, it should finally be pointed out that for a better understanding of the structure, the electrical machine 1 or the rotor 3 or the lamella 5 are not necessarily shown to scale.

REFERENCE SYMBOL LIST

1 machine

2 stator 3 rotor 4 shaft 5 lamella

6 slat body 7 breakthrough

8 connecting element 9 connecting element 10 breakthrough

11 Circumferential direction 12 Radial direction 13 Section

14 section

15 angles

16 width

17 midrange

18 section

19 section

20 free space

21 length

22 beam

23 normals

24 center point

25 cutting angles

26 width

27 width

28 distance

29 height

Claims (12)

Patent claims 1. Rotor (3) with a shaft (4) and with at least one lamella (5) which is arranged on the shaft (4), the lamella (5) having an opening (7) through which the shaft (4 ) is passed through, and wherein the lamella (5) has a first connecting element (8) which cooperates with a second connecting element (9) formed on the shaft (4), in the radial direction (12) above the first connecting element (8). an opening (10) is formed in the lamella (5), so that the first connecting element (8) is resiliently deformable, characterized in that the first connecting element (8) has two contact points or contact areas with the shaft (4) which are spaced apart from one another in the circumferential direction. 2. Rotor (3) according to claim 1, characterized in that the opening (10) in the lamella (5) formed above the first connecting element (8) is at least approximately sickle-shaped. 3. Rotor (3) according to claim 1 or 2, characterized in that the first connecting element (8) is arcuate. 4. Rotor (3) according to one of claims 1 to 3, characterized in that the contact areas each extend over a length (21) which is between 0.1% and 10% of the total length of the first connecting element (8). 5. Rotor (3) according to one of claims 1 to 4, characterized in that normals (23) through the contact points or contact areas have a course that deviates from the radial direction (12) and are outside the center (24) of the shaft - in the axial direction considered - cut with a cutting angle (25). 6. Rotor (3) according to claim 5, characterized in that the cutting angle (25) of the normal (23) is between 5 ° and 90 °. 7. Rotor (3) according to one of claims 1 to 6, characterized in that the first connecting element (8) has a radial width (26) of a maximum of 40% of the radial width (27) of the lamella (5). 8. Rotor (3) according to one of claims 1 to 7, characterized in that a radial distance (28) is formed between the first connecting element (8) and the second connecting element (9) outside the contact points or the contact areas, the radial Distance (28) is between 0.1% and 5% of a maximum radial height (29) of the second connecting element (9). 9. Rotor (3) according to one of claims 1 to 8, characterized in that the second connecting element (9), viewed in cross section, is hump-shaped, semi-cylindrical, semi-eliptic, parabolic, lens-shaped, ramp-shaped, trapezoidal, triangular or polygonal. 10. Rotor (3) according to one of claims 1 to 9, characterized in that the first connecting element (8) has a thickness in the axial direction between 50% and 100% of the thickness of the lamella (5) in the same direction. 11. Rotor (3) according to one of claims 1 to 10, characterized in that a plurality of first connecting elements (8) are distributed over the circumference of the lamella (5) and a plurality of second connecting elements (9) are arranged distributed over the circumference of the shaft (4). are. 12. Electric machine (1), in particular electric motor, comprising a stator (2) and a rotor (3), characterized in that the rotor (3) is designed according to one of claims 1 to 11. This includes 3 sheets of drawings