Rotor for an electric machine with improved alignment of rotor magnets

Abstract

The invention relates to a rotor (9) for an electric machine (1), comprising a laminated rotor core (12.12d) having magnet pockets (14.14j) and rotor magnets (15, 15') arranged therein. The rotor magnets (15, 15') have a substantially rectangular cross-section. An outer longitudinal side (B1) thereof lies on a first edge region (G1) of a recess (16a. . 16e') of the rotor lamination (13. . 13 II), with said edge region running parallel to the outer longitudinal side (B1). An inner longitudinal side (B2) is spaced apart from a second edge region (G2) of the recess (16a. . 16e'), running parallel to the inner longitudinal side (B2). A first corner (D1) between the outer transverse side (C1) and the inner longitudinal side (B2) contacts a third edge region (G3) of the recess (16a. . 16e'), which is inclined with respect to the longitudinal sides (B1, B2). The invention further relates to an electric machine (1a, 1d) having a rotor (9) of this type, to a vehicle (19) having an electric machine (1) of this type, and to a method for producing a rotor (9) of this type.

Description

[0001] Rotor for an electric machine with improved alignment of rotor magnets

[0002] TECHNICAL AREA

[0003] The invention relates to a rotor for an electric machine, comprising a rotor lamination stack with several axially stacked rotor laminations, each having a recess, the recesses forming a magnet pocket. The rotor also includes a rotor magnet received in the magnet pocket, having a substantially rectangular cross-section in the plane of a rotor lamination, and having longitudinal sides and shorter transverse sides. An outer longitudinal side is arranged radially outside an inner longitudinal side, and an outer transverse side is arranged radially outside an inner transverse side. The outer transverse side meets the inner longitudinal side at a first corner, the inner transverse side meets the inner longitudinal side at a second corner, and the inner transverse side meets the outer longitudinal side at a third corner.Furthermore, the invention relates to an electric machine with a rotor of the type mentioned and a stator with respect to which the rotor is rotatably mounted. Finally, the invention relates to a vehicle with such an electric machine and to a method for manufacturing a rotor of the type mentioned.

[0004] The term "essentially rectangular cross-section" for a rotor magnet can refer to a cross-section corresponding to a rectangle with rounded corners. Such a cross-section can be created, in particular, by rounding the edges of a cuboid rotor magnet. Furthermore, the term "essentially rectangular cross-section" for a rotor magnet can refer to a cross-section corresponding to a rectangle with chamfered or beveled corners. Such a cross-section can be created, in particular, by chamfering the edges of a cuboid rotor magnet. STATE OF THE ART

[0005] Such a rotor, such an electric machine, such a vehicle, and such a method are fundamentally known from the prior art. A problem with the known solutions is that the rotor magnets are sometimes only inadequately aligned and fixed within the rotor lamination stack, which can lead to imbalance and, if the rotor magnets are not potted with a potting compound in the magnet pockets, also to variable imbalance. Unpleasant vibrations during operation of the electric machine and bearing damage can result.

[0006] REVELATION OF THE INVENTION

[0007] One object of the invention is therefore to provide an improved rotor, an improved electric machine, an improved vehicle, and an improved method for manufacturing a rotor. In particular, the rotor magnets are to be aligned and fixed in the rotor lamination stack in a predictable and reproducible manner.

[0008] The object of the invention is solved with a rotor of the type mentioned at the outset, in which the outer longitudinal side of the rotor magnet cross-section abuts a first edge region of the recess of the rotor sheet running parallel to the outer longitudinal side, the inner longitudinal side of the rotor magnet cross-section is spaced apart from a second edge region of the recess of the rotor sheet running parallel to the inner longitudinal side, and the first corner of the rotor magnet cross-section contacts a third edge region of the recess of the rotor sheet, which is inclined with respect to the longitudinal sides.

[0009] The angle of inclination at which the third edge region is inclined relative to the longitudinal sides can, for example, be in a range of 10° to 20°, 20° to 30°, 30° to 45°, or between 45° and 90°. The third edge region can also be considered a raised section that projects beyond the second edge region of the recess. The third edge region is designed such that the rotor magnet is deflected towards the outer longitudinal side when the rotor magnet is moved within the recess towards the third edge region.

[0010] In particular, the rotor lamination can have an elastically deformed spring tongue that exerts a force with a force component oriented parallel to the longitudinal sides on the inner transverse side, or which pushes the rotor magnet towards the third edge region or towards the raised section. In addition to elastic deformation, the spring tongue can also be plastically deformed.

[0011] It is also conceivable that the rotor magnet is pressed towards the third edge region, or the raised section, as the rotor rotates around its axis. Generally, the third edge region can advantageously be straight, convexly curved, or concavely curved, or designed as a straight, convexly curved, or concave ramp.

[0012] Furthermore, the object of the invention is solved with an electric machine which has a rotor of the type mentioned and a stator with respect to which the rotor is rotatably mounted.

[0013] Furthermore, the problem of the invention is solved with a vehicle equipped with such an electric machine which is intended to propel the vehicle.

[0014] Finally, the object of the invention is solved by a method for manufacturing a rotor of the aforementioned type with a spring tongue, comprising the following steps:

[0015] Providing the rotor lamination stack and the rotor magnet, inserting the rotor magnet into the magnet pocket, whereby the spring tongue is elastically deformed and presses the rotor magnet against the third edge area.

[0016] In addition to elastic deformation, the spring tongue can also be plastically deformed when the rotor magnet is inserted.

[0017] The proposed measures ensure that the rotor magnets are aligned within the rotor lamination stack in a predictable and reproducible manner and reliably fixed in place. Any imbalance caused by the rotor magnets is therefore minimal, if present at all, and cannot be altered by the fixed position. Vibrations during operation of the electric machine, as well as bearing damage caused by imbalance in the rotor magnets, can thus be avoided or at least significantly reduced. Furthermore, rotor manufacturing is considerably simplified, as balancing can be performed more easily.

[0018] The corners of the rotor magnet cross-section can all have different radial distances from the rotor axis. For example, a fourth corner, where the outer transverse side meets the outer longitudinal side, can be the radially outermost corner. Moving inwards, the first corner, the third corner, and the second corner, which is radially innermost, can follow. In detail, a longitudinal direction of the rectangular cross-section of the rotor magnet can thus be obliquely oriented relative to a radial beam passing through the center of gravity of the cross-section and emanating from the rotor axis.

[0019] Further advantageous embodiments and developments of the invention will become apparent from the dependent claims and from the description in conjunction with the figures. It is particularly advantageous if the length of a section of the inner longitudinal side of the rotor magnet cross-section opposite the second edge region, plus the length of a section of the inner longitudinal side opposite the third edge region, is at least 70%, 80%, 85%, 90%, or 100% of the length of the inner longitudinal side. This allows the magnetic flux generated by the rotor magnet to be introduced into the rotor lamination optimally and with minimal losses.

[0020] It is advantageous if the force exerted by the spring tongue has a force component oriented parallel to the transverse sides. This means that the force is then oriented at an angle of 0° > 0° > 90° with respect to the longitudinal sides of the cross-section.

[0021] It is also advantageous if the spring tongue contacts the inner transverse side, or the rotor magnet cross-section, only at the second corner. This reliably presses the rotor magnet against the first edge of the rotor plate recess, thus aligning and fixing it in a more predictable and reproducible manner. Alternatively or additionally, it is conceivable that the spring tongue contacts the inner transverse side only at the third corner. The rotor magnet is then tilted within the recess and thus also assumes a defined position.

[0022] In one embodiment, the spring tongue can be spaced apart from the second and / or third corner. This means the spring tongue contacts the rotor magnet (only) on the inner transverse side of the cross-section. The force component in the transverse direction is then a frictional force, which is caused by the force component in the longitudinal direction. In this embodiment, it is particularly advantageous if the spring tongue contacts the rotor magnet in one half of the inner transverse side, which is closer to the third corner than to the second corner. This results in a torque around the first corner that promotes the desired alignment of the rotor magnets in the recess. In another embodiment, the spring tongue can be designed in the form of a non-right-angled parallelogram. This results in a favorable shape for the magnet pocket.

[0023] Generally, the spring tongue can be elastically deformed either along the rotor axis or perpendicular to it. In the first case, the spring tongue is bent out of the plane of the rotor lamination; in the second case, it is bent within the plane of the rotor lamination. In addition to elastic deformation, the spring tongue can also be plastically deformed along the rotor axis or perpendicular to it.

[0024] It is also advantageous if the spring tongue is elastically deformable further from the inner transverse side. In other words, the spring tongue is deformed exclusively elastically. This prevents any potential weakening of the spring tongue due to plastic deformation when the rotor magnet is inserted into the magnet pocket.

[0025] It is also advantageous if the inner transverse side is spaced apart from a radially opposite fourth edge region of the rotor lamination. This allows manufacturing tolerances of the rotor magnet and / or the rotor lamination to be effectively compensated.

[0026] It is advantageous if the gap between the rotor magnet and the magnet pocket is filled with a potting compound. This ensures that the rotor magnets are securely fixed within the magnet pockets. The proposed measures facilitate the potting process, as they reliably align and fix the rotor magnets within the rotor plate, preventing them from shifting during the potting process.

[0027] BRIEF DESCRIPTION OF THE FIGURES Exemplary embodiments of the invention are shown in the accompanying schematic figures. They show:

[0028] Fig. 1 shows a first exemplary and schematically depicted electrical machine in half-section;

[0029] Fig. 2 shows an exemplary rotor lamination stack in oblique view;

[0030] Fig. 3 shows a detailed front view of a rotor plate with a third

[0031] Edge area of ​​the recess for the rotor magnet, which is designed as a straight ramp;

[0032] Fig. 4 is similar to Fig. 3, but with a convex third edge area and a slightly differently shaped spring tongue;

[0033] Fig. 5 is similar to Fig. 3, but with a jagged third edge area and a spring tongue which is elastically deformed transversely to the rotor axis;

[0034] Fig. 6 similar to Fig. 3, but with a trapezoidal spring tongue which is spaced away from the second and third corners of the rotor magnet cross-section;

[0035] Fig. 7 is similar to Fig. 6, but with a spring tongue that touches the rotor magnet near the third corner of the rotor magnet cross-section;

[0036] Fig. 9 shows a schematic sectional view of a rotor lamination stack with axially deformed spring tongues;

[0037] Fig. 10 similar to Fig. 9, but with special recesses for the spring tongues; Fig. 11 similar to Fig. 9, but with encapsulated rotor magnet and

[0038] Fig. 12 shows an exemplary vehicle with an electric machine of the proposed type.

[0039] DETAILED DESCRIPTION OF THE INVENTION

[0040] It is stated in the introduction that identical parts in the different embodiments are provided with the same reference numerals or component designations, possibly with different indices. The disclosure of a component contained in the description can be applied analogously to another component with the same reference numeral or component designation. Furthermore, the positional indications chosen in the description, such as "top," "bottom," "back," "front," "side," and so on, refer to the figure directly described and illustrated and, in the event of a change in position, must be applied analogously to the new position.

[0041] Fig. 1 shows a half-section through a schematically represented electric machine 1 with a stator housing 2, a front end shield 3, and a rear end shield 4. The stator housing 2, the front end shield 3, and the rear end shield 4 form a multi-part machine housing 5 or are part thereof. The electric machine 1 also has a stator 6, which comprises a stator core 7 (not shown in detail) and stator windings 8 arranged within the stator core 7. Furthermore, the electric machine 1 comprises a rotor 9 with a rotor shaft 10, which is rotatably mounted about a rotor axis or stator axis A relative to the stator 6 by means of rolling bearings 11a, 11b. Specifically, the first bearing 11a is located in the front bearing shield 3 and the second bearing 11b in the rear bearing shield 4. The rotor 9 also includes a rotor lamination stack 12 arranged on the rotor shaft 10, with several axially stacked rotor laminations 13.The rotor laminations 13 each have recesses which form magnet pockets 14 in which rotor magnets 15 are arranged.

[0042] Fig. 2 shows an exemplary rotor lamination stack 12a in oblique view. The magnet pockets 14..14" and the central opening for the rotor shaft 10 are clearly visible. The arrangement of the magnet pockets 14..14" is purely exemplary, and other arrangements would also be conceivable.

[0043] Fig. 3 shows a first example of a rotor sheet 13a with recesses 16a, 16a', 16" for three magnet pockets 14..14", wherein rotor magnets 15, 15' are shown in the recesses 16a, 16a', in a detailed front view. In reality, a rotor magnet would also be arranged in the recess 16", but this has been omitted in Fig. 3. Fig. 3 shows that the rotor magnets 15, 15' are arranged in a V-shape, each having a substantially rectangular cross-section in the plane of the rotor lamination 13a, and having longitudinal sides B1, B2 and shorter transverse sides C1, C2. That is, a length a of the longitudinal sides B1, B2, or a length a of the rotor magnet cross-section, is shorter than a length b of the transverse sides C1, C2, or a width b of the rotor magnet cross-section. An outer longitudinal side B1 is arranged radially outside an inner longitudinal side B2, and an outer transverse side C1 is arranged radially outside an inner transverse side C2.The outer transverse side C1 meets the inner longitudinal side B2 at a first corner D1, the inner transverse side C2 meets the inner longitudinal side B2 at a second corner D2, the inner transverse side C2 meets the outer longitudinal side B1 at a third corner D3, and the outer transverse side C1 meets the outer longitudinal side B1 at a fourth corner D4. The fourth corner D4 is the radially outermost corner. Moving inwards, the first corner D1, the third corner D3, and the second corner D2, which is radially innermost, follow. In detail, one longitudinal direction of the rectangular cross-section of the rotor magnet 15 is obliquely oriented relative to a radial beam passing through the centroid of the cross-section and emanating from the rotor axis A. Therefore, the corners D1 to D4 have different radial distances from the rotor axis A.

[0044] The outer longitudinal side B1 of the rotor magnet 15 abuts a first edge region G1 of the recess 16a of the rotor sheet 13a, which runs parallel to the outer longitudinal side B1, and the inner longitudinal side B2 of the rotor magnet 15 is spaced apart from a second edge region G2 of the recess 16a of the rotor sheet 13a, which runs parallel to the inner longitudinal side B2. The first corner D1 of the rotor magnet 15 contacts a third edge region G3i of the recess 16a of the rotor sheet 13a, which is inclined with respect to the longitudinal sides B1 and B2. The third edge region G3i can also be considered a raised section that projects beyond the second edge region G2 of the recess 16a. The third edge region G3i is designed such that the rotor magnet 15 is deflected in the direction of the fourth corner D4 or in the deflection direction c when the rotor magnet 15 is moved towards the third edge region G3i in the recess 16a.In this example, the edge region G3i is straight, or rather, designed as a straight ramp or approach slope. However, it could also be convex or concave.

[0045] The rotor lamination 13a also features a spring tongue 17a, which presses the rotor magnet 15 towards the third edge region G3i. During the manufacture of the rotor 9, the rotor lamination stack 12 and the rotor magnet 15 are prepared, and the rotor magnet 15 is then inserted into the magnet pocket 14. This causes the spring tongue 17a to deform elastically, pressing the rotor magnet 15 against the third edge region G3i. Furthermore, the rotor magnet 15 is also pressed towards the third edge region G3i when the rotor 9 rotates about its rotor axis A. In this example, the spring tongue 17a projects obliquely into the recess 16a when viewed along the rotor axis A and is elastically deformed or bent in the direction of the rotor axis A (i.e., bent out of the plane of the rotor lamination 13a).Specifically, the elastically deformed spring tongue 17a of the rotor lamination 13a exerts a force F on the inner transverse side C2 with a force component oriented parallel to the longitudinal sides B1, B2 and a force component oriented parallel to the transverse sides C1, C2. This means that the force F is oriented at an angle of 0° > oc > 90° with respect to the longitudinal sides B1, B2 of the cross-section. Specifically, the spring tongue 17a contacts the inner transverse side C2, or the rotor magnet cross-section in this example, only at the second corner D2.

[0046] It is advantageous if the length d of a section of the inner longitudinal side B2 of the rotor magnet cross-section opposite the second edge region G2, plus the length e of a section of the inner longitudinal side B2 opposite the third edge region G3, is at least 70%, 80%, 85%, 90%, or 100% of the length a of the inner longitudinal side B2. This allows the magnetic flux generated by the rotor magnet 15' to be introduced into the rotor lamination 13a optimally and with minimal losses.

[0047] Another optional feature of the arrangement disclosed in Fig. 3 is that the inner transverse side C2 is spaced apart from a radially inwardly opposite fourth edge region G4 of the recess 16a. This allows manufacturing tolerances of the rotor magnet 15 and the rotor lamination 13a to be well compensated.

[0048] It is also advantageous if the spring tongue 17a is elastically deformable further away from the inner transverse side C2. In other words, the spring tongue 17a is deformed exclusively elastically. This prevents any potential weakening of the spring tongue 17a due to plastic deformation when the rotor magnet is inserted into the magnet pocket. For the sake of completeness, it should be noted that the technical teaching disclosed for the rotor magnet 15, the recess 16a, and the spring tongue 17a can be applied analogously to the rotor magnet 15', the recess 16a', and the spring tongue 17a', and vice versa.

[0049] It is further noted that a gap between the rotor magnet 15, 15' and the recess 16a, 16a' may be filled with a potting compound (see also Fig. 1 1 ).

[0050] Fig. 4 shows a further embodiment of a rotor plate 13b, which is similar to the rotor plate 13a shown in Fig. 3, and to which the technical teaching disclosed for rotor plate 13a is applicable mutatis mutandis. In contrast to rotor plate 13a, the third edge regions G3ii, G3ii' are convexly shaped and slightly radially inward. In addition, the spring tongues 17b, 17b' are shaped somewhat differently, resulting in a slightly different direction for the force F. Furthermore, the recesses 16b, 16b' are shaped somewhat differently. In this embodiment, two lengths d', d' of a section of the inner longitudinal side B2 opposite the second edge region G2 result.In this context, it is advantageous if the lengths d', d" of the sections of the inner longitudinal side B2 of the rotor magnet cross-section opposite the second edge region G2 plus the length e of the section of the inner longitudinal side B2 opposite the third edge region G3 is at least 70%, 80%, 85%, 90% or 100% of the length a of the inner longitudinal side B2.

[0051] Fig. 5 shows another embodiment of a rotor plate 13c, which is similar to the rotor plate 13a shown in Fig. 3, and to which the technical teaching disclosed for rotor plate 13a is applicable mutatis mutandis. In contrast to rotor plate 13a, the third edge regions G3iii, G3iii' are slightly undercut on their radial outer surface, so that they are more easily deformable. In addition, the spring tongues 17c, 17c' in this example are elastically deformed or bent transversely to the rotor axis A (that is, bent in the plane of the rotor plate 13c).

[0052] In the embodiments shown in Figures 3 to 5, the spring tongue 17a..17c presses against the second corner D2. However, it would also be conceivable for the spring tongue 17a..17c to press against the third corner D3. The rotor magnet 15 is then tilted in the recess 16a..16c and thus also assumes a defined position.

[0053] Fig. 6 further shows an embodiment of a rotor lamination 13d, which is similar to the rotor lamination 13a shown in Fig. 3, and to which the technical teaching disclosed for rotor lamination 13a is applicable mutatis mutandis. In contrast to rotor lamination 13a, the spring tongues 17d, 17d' are spaced apart from the second corner D2 and the third corner D3. That is, the spring tongues 17d, 17d' contact the rotor magnets 15, 15' (only) on the inner transverse side C2 of the cross-section. The force component in the transverse direction is then a frictional force, which is caused by the force component in the longitudinal direction. In this example, the spring tongues 17d, 17d' are formed in the shape of a non-right-angled parallelogram.

[0054] Fig. 7 shows a further embodiment of a rotor lamination 13e, which is similar to the rotor lamination 13d shown in Fig. 6, and to which the technical teaching disclosed for rotor lamination 13d is applicable mutatis mutandis. However, the spring tongues 17e, 17e' are thinner and each contact the rotor magnets 15, 15' in one half of the inner transverse side C2, which is closer to the third corner D3. This results in a torque about the first corner D1 favoring the desired alignment of the rotor magnets 15, 15' in the recesses 16e, 16e'.

[0055] As an alternative to the V-arrangements of the rotor magnets shown, the invention can also be used for a double-V arrangement of the rotor magnets. In such an arrangement, a first pair of magnet pockets can form a radially inner V, wherein a second pair of magnet pockets forms a radially outer inner V, which is arranged circumferentially between the magnet pockets of the first pair. A rotor magnet according to the invention can be accommodated in each magnet pocket of the first pair and / or the second pair.

[0056] Fig. 9 shows a sectional view of an exemplary rotor lamination stack 12b, which is composed of two different rotor laminations 13i, 13ii and has a magnet pocket 14h. The rotor laminations 13i have spring tongues 17, while the rotor laminations 13ii do not. This creates a gap or free space H, which allows elastic deformation of the spring tongues 17 in the direction of the rotor axis A.

[0057] Fig. 10 shows a rotor lamination stack 12c, which is very similar to the rotor lamination stack 12b from Fig. 9. In contrast, the rotor lamination stack 12c is composed of three different rotor laminations 13i...13iii, with recesses I formed in the magnet pocket 14i, which allow elastic deformation of the spring tongues 17 in the direction of the rotor axis A.

[0058] Fig. 11 shows another rotor lamination stack 12d, which is very similar to the rotor lamination stack 12b from Fig. 9. In contrast, the space H between the rotor magnet 15 and the magnet pocket 14j in rotor lamination stack 12d is filled with a potting compound 18.

[0059] Figure 12 shows the electric machine 1 installed in a vehicle 19. The vehicle 19 has two axles, one of which is driven. Specifically, the electric machine 1 is connected to the half-axles 21 of the rear axle via an optional transmission 20. The driven wheels 22 are mounted on the half-axles 21. The vehicle 19 is driven at least partially or temporarily by the electric machine 1. That is, the electric machine 1 can serve as the sole drive for the vehicle 19 or, for example, be used in conjunction with an internal combustion engine (hybrid drive). Finally, it should be noted that the scope of protection is defined by the claims. However, the description and the drawings should be used to interpret the claims. The features shown in the figures can be freely interchanged and combined with one another.It is specifically noted that the depicted devices may in reality comprise more or fewer components than shown. In some cases, the depicted devices or their components may also be shown not to scale and / or enlarged and / or reduced in size.

[0060] Reference symbol list

[0061] 1 electric machine

[0062] 2 Stator housings

[0063] 3 first warehouse sign

[0064] 4 second warehouse sign

[0065] 5 machine housings

[0066] 6 Stator

[0067] 7 Stator lamination stack

[0068] 8 Stator winding head

[0069] 9 Rotor

[0070] 10 Rotor shaft

[0071] 11 a, 11 b (rolling) bearings

[0072] 12..12d Rotor lamination package

[0073] 13..13111 Rotor plate

[0074] 14..14Ü Magnetic pocket

[0075] 15, 15' Rotor magnet

[0076] 16a..16e' Exclusion

[0077] 17..17e' Feather tongue

[0078] 18 Potting compound

[0079] 19 vehicles

[0080] 20 gearboxes

[0081] 21 Half-axis

[0082] 22 Wheel oc Angle Force / Longitudinal side Rotor magnet cross-section a Length of rotor magnet cross-section b Width of rotor magnet cross-section c Deflection direction d, d', d" Overlap length second edge region / inner longitudinal side e Overlap length third edge region / inner longitudinal side

[0083] A Rotor axis / Stator axis

[0084] B1, B2 Longitudinal side Rotor magnet cross-section

[0085] C1, C2 Cross-section of rotor magnet

[0086] D1..D4 Corner Rotor magnet cross-section

[0087] F force

[0088] G1..G4 Edge area

[0089] H space magnetic pocket

[0090] I Exclusion

Claims

Patent claims 1. Rotor (9) for an electric machine (1), comprising a rotor lamination stack (12..12d) with several axially stacked rotor laminations (13..13iii), each having a recess (16a..16e'), wherein the recesses (16a..16e') form a magnet pocket (14..14j), and a rotor magnet (15, 15') received in the magnet pocket (14..14j) having a substantially rectangular cross-section in the plane of a rotor lamination (13..13iii), the longitudinal sides (B1, B2) and shorter transverse sides (C1, C2), wherein an outer longitudinal side (B1) is arranged radially outside an inner longitudinal side (B2) and an outer transverse side (01) is arranged radially outside an inner transverse side (C2), wherein the outer transverse side (C1) meets the inner longitudinal side (B2) at a first corner (D1), the inner transverse side (C2) meets the inner longitudinal side (B2) at a second corner (D2), and the inner transverse side (C2) meets the outer longitudinal side (B1) at a third corner (D3), characterized in that the outer longitudinal side (B1) abuts a first edge region (G1) of the recess (16a..16e') of the rotor sheet (13..13iii) extending parallel to the outer longitudinal side (B1), the inner longitudinal side (B2) is abutted by a first edge region (G1) of the recess (16a..16e') of the rotor sheet (13..13iii) extending parallel to the inner longitudinal side (B2) running second edge area (G2) of the recess (16a..16e') of the rotor plate (13..13iii) is spaced apart and the first corner (D1 ) contacts a third edge region (G3) of the recess (16a..16e') of the rotor sheet (13..13iii) which is inclined with respect to the longitudinal sides (B1 , B2).

2. Rotor (9) according to claim 1 , characterized in that the third edge region (G3) is straight, convexly curved or concavely curved.

3. Rotor (9) according to claim 1 or 2, characterized in that a length (d, d', d' 1 ) a section of the inner longitudinal side (B2) opposite the second boundary region (G2) plus a length (e) of a section opposite the third boundary region area (G3) opposite section of the inner longitudinal side (B2) is at least 70%, 80%, 85%, 90%, or 100% of the length (a) of the inner longitudinal side (B2).

4. Rotor (9) according to one of the preceding claims, characterized in that an elastically deformed spring tongue (17..17g') of the rotor sheet exerts a force (F) with a force component aligned parallel to the longitudinal sides (B1 , B2) on the inner transverse side (C2).

5. Rotor (9) according to claim 4, characterized in that the force (F) has a force component aligned parallel to the transverse sides (C1 , C2).

6. Rotor (9) according to claim 4 or 5, characterized in that the spring tongue (17..17g') contacts the inner transverse side (C2) only at the second corner (D2) and / or third corner (D3).

7. Rotor (9) according to claim 4 or 5, characterized in that the spring tongue (17..17g') is spaced apart from the second corner (D2) and / or third corner (D3).

8. Rotor (9) according to one of claims 4 to 7, characterized in that the spring tongue (17..17g') is formed in the form of a non-rectangular parallelogram.

9. Rotor (9) according to one of claims 4 to 8, characterized in that the spring tongue (17..17g') is elastically deformed in the direction of the rotor axis (A) or transversely to the rotor axis (A).

10. Rotor (9) according to one of claims 4 to 9, characterized in that the spring tongue (17..17g') is elastically deformable further away from the inner transverse side (C2).

11. Rotor (9) according to one of the preceding claims, characterized in that the inner transverse side (02) is spaced apart from a radially inwardly opposing fourth edge region (G4) of the rotor sheet (13..13iii).

12. Rotor (9) according to one of the preceding claims, characterized in that a space (H) between the rotor magnet (15, 15') and the magnet pocket (14..14j) is filled with a potting compound (18).

13. Electric machine (1) , comprising a rotor (9) according to one of claims 1 to 12 and a stator (6) with respect to which the rotor (9) is rotatably mounted.

14. Vehicle (19) with an electric machine (1 ) according to claim 13, which is provided for driving the vehicle (19).

15. Method for manufacturing a rotor (9) according to one of claims 3 to 12, characterized by the steps Providing the rotor lamination stack (12..12d) and the rotor magnet (15, 15'), Inserting the rotor magnet (15, 15') into the magnet pocket (14..14j), whereby the spring tongue (17..17g') is elastically deformed and presses the rotor magnet (15, 15') against the third edge region (G3).

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