Rotor of an electric machine designed as a permanent magnet synchronous machine, electric machine and motor vehicle

Abstract

Rotor (10) of an electric machine (11) designed as a permanent magnet synchronous machine, wherein the rotor (10) has a rotor body (13) and poles (12) which are arranged alternately next to each other in the circumferential direction and form pole pairs, wherein the rotor body (13) carries a bandage (18) on its outer circumference, wherein in the region of each pole (12) between the rotor body (13) and an insert (15) which is arranged in a recess (14) of the rotor body (13) in the region of the respective pole (12), V-shaped pockets (16) diverging radially outwards are formed in which permanent magnets (17) are arranged, wherein in the region of each pole (12) the radially outward diverging pockets (16) are bounded by walls (21, 22), wherein straight lines extending radially outwards in the plane of these walls are the q-axes (19) of the respective pole (12) radially outside of the rotor body (13) cut,wherein the rotor body (13) has material recesses (25) in the region of the q-axes of its poles (12) adjacent to the radially outwardly open pockets (16), such that the rotor body (13) is shortened radially inward in the region of the q-axes (19) of its poles (12) at a distance from the bandage (18), and / or wherein the inserts (15) have material recesses (26) such that the inserts (15) are shortened at least section by section radially inward in the region between the q-axes (19) of the poles at a distance from the bandage (18).

Description

[0001] The invention relates to a rotor of an electric machine designed as a permanent magnet synchronous machine. Furthermore, the invention relates to an electric machine and a motor vehicle.

[0002] The basic structure of an electric machine is well-known from practical experience. An electric machine has a housing and a stator. The stator is also called the stator. Furthermore, an electric machine has a rotor. The rotor is also called the runner. The rotor is mounted to rotate within the housing.

[0003] DE 10 2022 203 121 A1 discloses a rotor of an electric machine with multiple poles. Pockets are formed in the region of each pole, diverging radially outwards, and permanent magnets are accommodated in these pockets. These pockets are closed externally by bridge webs. The bridge webs are deformed by a mechanical preload of a rotor sleeve, which connects radially to the outside of the bridge webs, in order to reduce play between the pockets accommodating the permanent magnets and the permanent magnets arranged in the pockets.

[0004] DE 10 2020 103 868 A1 discloses a rotor of an electric machine with a rotor body in which inserts are placed in recesses. Between the rotor body and the inserts are V-shaped pockets that diverge radially outwards, in which permanent magnets are arranged. The pockets are open radially outwards.

[0005] US 2011 / 0156521A1 discloses a rotor of an electric machine designed as a permanent magnet synchronous machine. Permanent magnets are arranged in V-shaped pockets of a rotor body that diverge radially outwards. A band is attached radially to the outside of the rotor body.

[0006] DE 100 20 946 A1, JP 2020- 145 894 A and EP 3 107 192 A1 disclose further state of the art.

[0007] Currently, it is difficult to provide a rotor for a permanent magnet synchronous electric machine that exhibits high speed stability, particularly at rotational speeds and thus peripheral or surface velocities exceeding 150 m / s without risk of damage. Therefore, there is a need for a rotor for a permanent magnet synchronous electric machine that can operate at high speeds and thus high peripheral or surface velocities while providing high torque and high power density.

[0008] The object of the invention is to create a rotor for an electric machine designed as a permanent magnet synchronous machine, which exhibits high torque density and high speed stability. Furthermore, an electric machine with such a rotor and a motor vehicle with an electric machine comprising such a rotor are to be provided.

[0009] This problem is solved by a rotor according to claim 1 and claim 3, by an electric machine according to claim 18 and by a motor vehicle according to claim 19.

[0010] The rotor according to claims 1 and 3 comprises a rotor body. The rotor according to the invention has poles which are arranged alternately next to each other in the circumferential direction and form pole pairs. In the region of each pole, V-shaped pockets diverging radially outwards are formed between the rotor body and an insert which is arranged in a recess of the rotor body in the region of the respective pole, in which permanent magnets are arranged.

[0011] In the region of each pole of the rotor, the V-shaped pockets diverging radially outwards are bounded by walls of the rotor body and by walls of the respective insert, wherein, in the rotor of claim 1, radially outward extending straight lines, which extend radially outwards in the plane of these walls, intersect the q-axes of the respective pole radially outside the rotor body. The rotor body carries a bandage on its outer circumference.

[0012] The rotor body of the rotor of claim 1 has material recesses in the region of the q-axes of its poles adjacent to the radially outwardly open pockets, such that the rotor body is shortened or offset radially inward in the region of the q-axes of its poles at a distance from the bandage. Alternatively or additionally, the inserts of the rotor of claim 1 have material recesses such that the inserts are shortened or offset radially inward at least partially in the region between the q-axes of the poles at a distance from the bandage.

[0013] In the rotor of claim 3, the radially outward extending straight lines, which lie in the plane of the walls of the rotor body and the respective insert, and which define the V-shaped pockets of the rotor body diverging radially outward, can also intersect the q-axes of the respective pole radially within the rotor body, which carries a bandage on its outer circumference. The inserts of the rotor of claim 3, in turn, have material recesses such that the inserts are shortened or offset, at least partially, radially inward in the area between the q-axes of the poles at a distance from the bandage.

[0014] The rotor according to the invention exhibits a high torque density and high speed stability. The contact pressure of the bandage on the inserts, the rotor body, and ultimately on the permanent magnets can be precisely adjusted during operation via the material recesses.

[0015] In particular, during rotor operation, when the rotor is subjected to centrifugal forces and the contact pressure between the permanent magnets and the rotor body is reduced as a result of these forces, the contact pressure of the bandage on the inserts, the rotor body, and ultimately on the permanent magnets can be adjusted by means of the material recesses and the projections arranged between them. This allows the local increase in contact pressure in the area of ​​the projections during rotor operation to at least partially compensate for the centrifugal force-induced reduction in contact pressure between the permanent magnets and the rotor body. A roughly constant pressure distribution and thus uniform stress on the bandage can be ensured around the circumference of the rotor. The bandage can therefore be made thinner overall and thus lighter.

[0016] Additionally, the local contact force increase between the rotor body and the bandage is reduced during the joining or assembly process of the rotor according to the invention. Since this contact force increase is a limiting factor in the assembly process, this means that rotors with a higher bandage overlap can be joined or assembled. In known rotors, contact force increases on the rotor body can lead to buckling and thus failure of the rotor body in the region of the q-axes. With the invention, a higher bandage overlap can be selected without this leading to buckling and thus failure of the rotor body, particularly when the rotor body is shortened or offset radially inwards at a distance from the bandage in the region of its poles in the q-axes.

[0017] Preferably, at least the inserts are shortened radially inwards in the area of ​​their material recesses, maintaining a distance from the bandage, such that the inserts do not touch the bandage in the area of ​​the material recesses. This serves to provide the required contact pressure of the bandage against the insert and, via the insert, against the permanent magnets.

[0018] Preferably, the inserts contact the bandage in the area between the material recesses of the inserts, specifically in the area of ​​projections of the inserts arranged between the material recesses. The circumferential positions of the inserts where they contact the bandage, and thus the projections of the inserts arranged between the material recesses, lie on a straight line extending on one side through the center of the rotor body and on the other side through a partial center of gravity of the respective pole. This partial center of gravity is determined by the at least one permanent magnet arranged in one of the V-shaped pockets diverging radially outwards and the adjacent half of the respective insert. This is particularly preferred to ensure a constant pressure distribution and thus a constant stress distribution on the bandage when centrifugal forces act on the rotor around its circumference during operation.

[0019] Preferably, the projections positioned between the material recesses of the inserts have a larger outer radius than the rotor body in the region of the q-axes. This is also preferred to ensure a constant pressure distribution and stress on the bandage when centrifugal forces act on the rotor around its circumference.

[0020] Preferably, the recesses in the rotor body and / or the inserts are filled with a potting compound or a filler material such that the bandage contacts the potting compound or the filler material. The potting compound or the filler material has a lower stiffness and therefore a higher elasticity than the material of the rotor body and / or the inserts and / or the permanent magnets. The potting compound or filler material allows for advantageous adjustment of the pressure distribution between the bandage, the inserts, the rotor body, and ultimately the permanent magnets. This ensures a uniform pressure distribution and thus a uniform stress distribution on the bandage during operation under centrifugal forces acting on the rotor, considering the circumference of the rotor and therefore the bandage.

[0021] Preferably, to form the material recesses on the inserts, the outer radius of the inserts is shortened over the circumference of the inserts by a continuous function, which preferably has several maxima and several minima for the outer radius of the inserts, and thus drawn radially inwards. Alternatively, to form the material recesses on the inserts, the outer radius of the inserts is shortened stepwise over the circumference of the inserts and thus drawn radially inwards. Forming the material recesses on the inserts of the rotor of the electric machine, designed as a permanent magnet synchronous machine, by a continuous function is particularly preferred for reasons of strength.

[0022] Preferred embodiments of the invention are described in the dependent claims and the following description. Exemplary embodiments of the invention are explained in more detail with reference to the drawing, without being limited thereto. The drawing shows: Fig. 1 a schematic section of a first rotor of an electric machine designed as a permanent magnet synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 2 a schematic section of a second rotor of an electric machine designed as a permanent magnet synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 3 a schematic section of a third rotor of an electric machine designed as a permanent magnet synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 4. Further development of the rotor of the Fig. 2; Fig. 5 further development of the rotor of the Fig. 3; Fig. 6. Further development of the rotor of the Fig. 2; Fig. 7 further development of the rotor of the Fig. 3; Fig. 8 a schematic section of a fourth rotor of an electric machine designed as a permanent magnet synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 9 a schematic section of a fifth rotor of an electric machine designed as a permanent magnet synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 10 further development of the rotor of the Fig. 8; Fig. 11 further development of the rotor of the Fig. 9; Fig. 12 further development of the rotor of the Fig. 8; Fig. 13 further development of the rotor of the Fig. 9; Fig. 14 a schematic section of a sixth rotor of an electric machine designed as a permanent excitation synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 15 further development of the rotor of the Fig. 2; Fig. 16 a schematic section of a seventh rotor of an electric machine designed as a permanent magnet synchronous machine, which serves as a drive unit in a motor vehicle; Fig. 17 a motor vehicle with an electric machine serving as a drive unit.

[0023] Fig. Figure 1 shows a section of a rotor 10 of an electric machine 11 designed as a permanent magnet synchronous machine. The electric machine 11 is preferably designed as a drive unit of a motor vehicle 100, namely a passenger car designed as a hybrid vehicle or electric vehicle.

[0024] Radially, a stator (not shown) of the electric machine 11 is attached to the outer edge of the rotor 10. The rotor 10 and the stator are housed in a casing (not shown) of the electric machine 11, with the rotor 10 being rotatably mounted in the casing of the electric machine 11.

[0025] Fig. Figure 1 shows a section of a first rotor 10 according to the invention in the region of a pole 12 of the rotor 10, wherein several poles 12 are arranged next to each other in the circumferential direction and form pole pairs.

[0026] Each pair of poles forms a pole pair. The circumferential extent of a pole 12 is 360° / 2p. p corresponds to the number of pole pairs of the rotor 10. Preferably, the rotor has between two and five pole pairs.

[0027] The rotor 10 has a rotor body 13. In the region of each pole 12, a recess 14 is formed in the rotor body 13, into which a corresponding insert 15 is inserted. In the region of each pole 12, V-shaped pockets 16 are formed between the rotor body 13 and the respective insert 15, diverging radially outwards. Permanent magnets 17 are arranged in these pockets. The pockets 16 serving to receive the permanent magnets 17 are open radially outwards. The pockets 16 serving to receive the permanent magnets 17 thus form a pair of pockets in the region of each pole 12, with the pockets 16 of each pair being arranged in a V-shape relative to each other, diverging radially outwards and therefore converging radially inwards.

[0028] A bandage 18 is attached radially to the outer surface of the rotor base body 13 and the inserts 15. A contact force can be exerted via the bandage 18 on the inserts 15, on the rotor base body 13, and on the permanent magnets 17 arranged between the rotor base body 13 and the inserts 15.

[0029] As already explained, shows Fig. 1. A pole 12 of the rotor 10 of the electric machine 11. The pole 12 shown is bounded on both sides by so-called q-axes 19. A d-axis 20 of the pole 12 extends in the middle of its circumferential extent.

[0030] The V-shaped pockets 16 of the rotor 10, which extend radially outwards and diverge radially outwards and serve to receive the permanent magnets 17, are bounded radially inwards by walls 21 of the rotor body 13 and radially outwards by walls 22 of the insert 15.

[0031] According to Fig. 1 and in the other embodiments, straight lines 23, 24, which extend radially outwards in the plane of these walls 21, 22 of the rotor base body 13 and the inserts 15, intersect the q-axes 19 of the respective pole 12 preferably radially outside the rotor base body 13 and radially outside the bandage 18 adjoining the rotor base body 13.

[0032] In the exemplary embodiment of the Fig. 1. The rotor body 13 has material recesses 25 in the region of its q-axes 19 and its poles 12 adjacent to the radially outwardly open pockets 16. Via the material recesses 25, the rotor body 13 is shortened or offset radially inwards at a distance from the bandage 18 in the region of its q-axes 19 and its poles 12, so that the rotor body 13 does not touch the bandage 18 in the region of its q-axes 19 and therefore in the region of its material recesses 25.

[0033] In the exemplary embodiment of the Fig. 2 The insert 25 of the respective pole has 12 material recesses 26, so that in Fig. 2 the inserts 15 are shortened or offset radially inwards at a distance from the bandage 18 via the material recesses 26, such that the respective insert 15 is shortened radially inwards at a distance from the bandage 18 in the area of ​​its material recesses 26 in such a way that the insert 15 does not touch the bandage 18 in the area of ​​its material recesses 26.

[0034] In the exemplary embodiment of the Fig. 3 are the features of the exemplary embodiments of the Fig. 1 and Fig. 2 combined with each other, so that both the rotor base body 13 and the inserts 15 have the material recesses 25, 26, so that therefore in Fig. 3 neither the rotor base body 13 in the area of ​​its material recesses 25 nor the inserts 15 in the area of ​​their material recesses 26 touch the bandage 18.

[0035] The material recesses 25, 26 in the area of ​​the rotor body 13 and / or in the area of ​​the respective insert 15 allow for a non-constant overlap between the bandage 18 and the rotor body 13, including the inserts 15, in the circumferential direction of the rotor. This enables the contact pressure of the bandage on the inserts 15 and the rotor body 13 to be adjusted as needed around the circumference of the rotor, particularly to optimally clamp the permanent magnets 17 between the rotor body 13 and the inserts 15 and to ensure a uniform pressure distribution and thus load distribution on the bandage 18 despite centrifugal forces. It is possible to increase the rotational speed of a rotor 10 while still using a thinner bandage 18.

[0036] A particularly preferred embodiment of the invention is one in which cavities formed by the material recesses 25 and / or 26 between the rotor base body 13 and the bandage 18 and / or between the inserts 15 and the bandage 18 are filled with a potting compound or a respective filling element, such that in the area of ​​the material recesses 25 and / or 26 the potting compound or the respective filling element contacts the bandage 18.

[0037] The potting compound or filler material has a higher elasticity than the material of the rotor base body 13, the material of the inserts 15 and the material of the permanent magnet 17.

[0038] In particular, the potting compound or the respective filler material is permanently magnetic.

[0039] The radial stiffness of the rotor 10 can be varied by means of the potting compound or the respective filler material, thus ensuring a more uniform pressure distribution on the bandage 18, which acts on the inserts 15 and the rotor base body 13, and consequently also on the magnets 17. This prevents uneven loading of the bandage 18 around its circumference.

[0040] Fig. 4, Fig. 5, Fig. 6 to Fig. 7 show further training of the rotors 10 of the Fig. 1, Fig. 2 to Fig. 3, namely Fig. 4 and Fig. 6 further training courses of the rotor 10 of the Fig. 2 and Fig. 5 and Fig. 7 further training courses of the rotor 10 of the Fig. 3.

[0041] In Fig. 4, Fig. 5, Fig. 6 to Fig. 7 and in the following Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. To ensure the clearest possible presentation, the q-axis 19, the d-axis 20 and the lines 22, 23 are not shown.

[0042] In the exemplary embodiments of the Fig. 4 and Fig. 5 Between the magnets 17 arranged in the V-shaped diverging recesses 16, there is another permanent magnet 27, which is arranged as a hidden permanent magnet 27 within the respective insert 15.

[0043] Regarding all other details, the exemplary embodiments of the Fig. 4, Fig. 5 with the exemplary embodiments of the Fig. 2, Fig. 3 agree, so that the explanations regarding the exemplary embodiments of the Fig. 1, Fig. 2 to Fig. 3 can be referred to.

[0044] The examples of implementation of Fig. 6 and Fig. 7 differ from the exemplary embodiments of the Fig. 2 and Fig. 3 by arranging two permanent magnets 17a, 17b in each of the pockets 16. By stacking permanent magnets 17a, 17b in the area of ​​the pockets 16 in this way, the arrangement of the permanent magnets 17a, 17b between the base body 13 and the inserts 15 can be improved.

[0045] Regarding all other details, the exemplary embodiments of the Fig. 4, Fig. 5 with the exemplary embodiments of the Fig. 2, Fig. 3 agree, so that the explanations regarding the exemplary embodiments of the Fig. 1, Fig. 2 to Fig. 3 can be referred to.

[0046] In the exemplary embodiments of the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 To form the material recesses 26 on the inserts 15, the outer radius of the inserts 15 is gradually shortened over their circumference and thus gradually pulled radially inwards. The inserts 15 only rest against the bandage 18 in the area of ​​the projections 28 positioned between the material recesses 26.

[0047] The projections 28, in the area where the inserts 15 abut or touch the bandage 18, lie on a straight line that extends on one side through the center of the rotor body 13 and on the other side through a partial center of gravity of the respective pole 12, wherein the respective partial center of gravity of the respective pole 12 is determined by the at least one permanent magnet 17, 17a, 17b arranged in the respective V-shaped outwardly diverging pocket 17 and the adjacent half of the respective insert 15 of the respective pole 12.

[0048] The projections 28 positioned between the material recesses 26 preferably have a larger outer radius than the rotor body 13 in the region of the q-axes of its poles 12.

[0049] By positioning the projections 28 arranged between the material recesses 26 on the aforementioned straight lines, preferably in combination with dimensioning the outer radius of the projections 28 in relation to the outer radius of the rotor body 13 in the region of the q-axes, the contact pressure of the bandage 18 on the rotor body 13, the inserts 15, and the permanent magnets 17, 17a, 17b can be adjusted such that the local increase in contact pressure in the region of the projections 28 during rotor operation at least partially compensates for a centrifugal force-induced reduction in contact pressure between the permanent magnets 17, 17a, 17b and the rotor body 13. This is preferred to ensure a constant pressure distribution and stress on the bandage 18 when centrifugal forces act on the rotor 10 around its circumference during operation.

[0050] Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. Figure 13 shows exemplary embodiments of a rotor 10 of an electric machine 11 according to the invention, which correspond to the exemplary embodiments of the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 correspond.

[0051] Thus, the exemplary embodiment corresponds to the Fig. 8 the exemplary embodiment of the Fig. 2, the exemplary embodiment of the Fig. 9 the embodiment of the Fig. 3, the exemplary embodiment of the Fig. 10 the exemplary embodiment of the Fig. 4, the exemplary embodiment of the Fig. 11 the embodiment of the Fig. 5, the exemplary embodiment of the Fig. 12 the exemplary embodiment of the Fig. 6 and the embodiment of the Fig. 13 the embodiment of the Fig. 7, however with the difference that in Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. 13 for the formation of the material recesses 26 on the inserts 15 the outer radius of the respective insert 15 is shortened over the circumferential extent of the same via a continuous function and is thus drawn inwards radially, i.e. not stepwise.

[0052] In the exemplary embodiments of the Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. The continuous function 13 forms two maxima 29 and three minima 30, with a maximum 29 positioned between each pair of minima 30. In the region of the maxima 29, the respective insert 15 touches the bandage 18. There may also be only one maximum, or more than two maxima.

[0053] Each of the circumferential positions, at which a maximum is formed and accordingly the respective insert 15 touches the bandage 18, lies in turn on a straight line that extends on the one hand through the center of the rotor base body 13 and on the other hand through a partial center of gravity of the respective pole, which is determined by the respective permanent magnet 17 and the adjacent half of the respective insert 15.

[0054] The material recesses 25, 26 are preferably filled by a potting compound or a respective filling element.

[0055] Except for the specific design of the material recesses on the outriggers 15, the embodiments of the Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. 13 with the exemplary embodiments of the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 agree, so reference is made to the above statements to avoid unnecessary repetition.

[0056] Fig. Figure 15 shows a further development of the exemplary embodiment of the Fig. 2, which differs from the exemplary embodiment of the Fig. 3 differs in that a further lens-shaped magnet 31, designed as a surface magnet, is arranged in a central material recess 26 of the insert 15. This magnet 31 has an elliptical cross-section and is therefore convexly curved. It partially contacts the bandage 18.

[0057] In the exemplary embodiment of the Fig. 14 differs from the embodiment of the Fig. 15 only in a central area of ​​the boom 15 the material recess 26 is formed in which the lens-shaped magnet 31 is arranged, so that here too the insert 15 only touches the bandage 18 section by section, as does the lens-shaped magnet 31.

[0058] In the exemplary embodiment of the Fig. 16 Two lens-shaped surface magnets 31 are arranged in material recesses 16 of the insert 15. These two lens-shaped surface magnets 31 contact the bandage 18 in sections, while the insert 15 does not contact the bandage 18 over its entire circumference.

[0059] The two permanent magnets 31 touch the bandage 18 at circumferential positions that lie on a respective straight line which extends on the one hand through the center of the rotor base body 13 and on the other hand through a respective partial center of gravity of the respective pole 12, which is determined by the at least one permanent magnet 17 arranged in a respective V-shaped pocket diverging radially outwards, the adjacent half of the respective insert 15 and the adjacent surface magnet 31.

[0060] The respective surface magnet 31 can be used as in Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12 to Fig. 13 The inserts 15 are contoured via a continuous function with at least one maximum and at least two minima. In the region of the respective maximum, the respective surface magnet 31 touches the bandage 18.

[0061] As already explained, in the illustrated embodiments, the material recesses 25, 26 are preferably completely filled by a potting compound or a respective filler element, preferably a paramagnetic potting compound that has a higher elasticity than the material of the rotor base body 13 and the material of the respective insert 15. The potting compound or the respective filler element can extend into the pockets 16.

[0062] All embodiments have in common that material recesses 25, 26 are formed on the rotor base body 13 in the area of ​​its q-axes 19 and / or on the inserts 15.

[0063] These material recesses 25, 26 are preferably completely filled with a potting compound or a respective filler body, wherein this potting compound or the respective filler body can also extend radially outside into the pockets 16 and thus radially outside cover the permanent magnets 17, 17a, 17b.

[0064] In the illustrated embodiments, the straight lines 23, 24, which run in the plane of the walls 21, 22 bounding the pockets 16 and extend radially outwards, intersect the q-axes of the respective pole 12 radially outside the rotor base body 13 and preferably also radially outside the bandage 18. In the subject matter of claim 3, these radially outwards extending straight lines can also intersect the q-axes of the respective pole 12 radially inside the rotor base body 13, which carries the bandage 18 on its outer circumference, and / or radially inside the bandage 18.

[0065] The invention enables an optimization of the contact pressure distribution between the bandage 18 and the inserts 15, as well as the rotor body 13, and thus ultimately also the permanent magnets 17, 17a, 17b. The invention also allows the radial stiffness to be more uniform in the circumferential direction during operation at high speeds, thus preventing local force concentrations in the bandage 18.

[0066] The outer diameter of the rotor body 13 is between 90 mm and 170 mm, preferably between 110 mm and 170 mm, and particularly preferably between 120 mm and 170 mm. The inner diameter of the rotor body 13 is between 10 mm and 110 mm, preferably between 30 mm and 80 mm, and particularly preferably between 40 mm and 80 mm.

[0067] The invention further relates to an electric machine 11 with a rotor 10 according to the invention, wherein the electric machine 11 is configured as a drive component of a motor vehicle 100, namely a hybrid vehicle or electric vehicle. The invention further relates to the motor vehicle 100, namely a hybrid vehicle or electric vehicle, with an electric machine 11 according to the invention serving as a drive component. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2022 203 121 A1

[0003] DE 10 2020 103 868 A1

[0004] US 2011 / 0 156 521 A1

[0005] DE 100 20 946 A1

[0006] JP 2020- 145 894 A

[0006] EP 3 107 192 A1

[0006]

Claims

[1] Rotor (10) of an electric machine (11) designed as a permanent magnet synchronous machine, wherein the rotor (10) has a rotor body (13) and poles (12) which are arranged alternately next to each other in the circumferential direction of the rotor body (13) and form pole pairs, and wherein the rotor body (13) has a bandage (18) on its outer circumference, wherein in the region of each pole (12) between the rotor base body (13) and an insert (15) which is arranged in a recess (14) of the rotor base body (13) in the region of the respective pole (12), V-shaped pockets (16) diverging radially outwards are formed, wherein permanent magnets (17) are arranged in the pockets (16), wherein in the region of each pole (12) the V-shaped pockets (16) diverging radially outwards are bounded by walls (21) of the rotor body (13) and by walls (22) of the respective insert (15), wherein straight lines extending radially outwards in the plane of these walls (21, 22) intersect q-axes (19) of the respective pole (12) radially outside the rotor body (13), wherein the rotor body (13) has material recesses (25) in the region of the q-axes of its poles (12) adjacent to the radially outward open pockets (16), such that the rotor body (13) is shortened or offset radially inward at a distance from the bandage (18) in the region of the q-axes (19) of its poles (12), and / or wherein the inserts (15) have material recesses (26) such that the inserts (15) are shortened or offset radially inward at least section by a distance from the bandage (18) in the region between the q-axes (19) of the poles (12). [2] Rotor (10) according to claim 1, characterized by , that the rotor base body (13) is shortened radially inwards in the area of ​​its material recesses (25) at a distance from the bandage (18) such that the rotor base body (13) does not touch the bandage (18) in the area of ​​the material recesses (25). [3] Rotor (10) of an electric machine (11) designed as a permanent magnet synchronous machine, wherein the rotor (10) has a rotor body (13) and poles (12) which are arranged alternately next to each other in the circumferential direction of the rotor body (13) and form pole pairs, and wherein the rotor body (13) has a bandage (18) on its outer circumference, wherein in the region of each pole (12) between the rotor base body (13) and an insert (15) which is arranged in a recess (14) of the rotor base body (13) in the region of the respective pole (12), V-shaped pockets (16) diverging radially outwards are formed, wherein permanent magnets (17) are arranged in the pockets (16), wherein the inserts (15) have material recesses (26) such that the inserts (15) in the area between the q-axes (19) of the poles (12) are at least sectionally shortened or offset radially inwards at a distance from the bandage (18). [4] Rotor (10) according to claim 1, 2 or 3, characterized by , that the inserts (15) are shortened radially inwards in the area of ​​their material recesses (26) at a distance from the bandage (18) such that the inserts (15) do not touch the bandage (18) in the area of ​​the material recesses (26). [5] Rotor (10) according to claim 4, characterized bythat the inserts (15) touch the bandage (18) in the area of ​​projections (28) positioned between the material recesses (26). [6] Rotor (10) according to claim 5, characterized by , that the circumferential positions of the inserts (15) at which they touch the bandage (18) lie on a straight line which extends through the center of the rotor body (13) and through a partial center of gravity of the respective pole (12) which is determined by at least one permanent magnet (17) arranged in one of the V-shaped pockets (16) diverging radially outwards and the adjacent half of the respective insert (15). [7] Rotor (10) according to claim 5 or 6, characterized by , that the projections (28) positioned between the material recesses (26) have a larger outer radius than the rotor body (13) in the region of the q-axes of its poles (12). [8] Rotor (10) according to any one of claims 1 to 7, characterized by, that the material recesses (25, 26) are filled with a potting compound or a filler such that the bandage (18) touches the potting compound or the filler. [9] Rotor (10) according to claim 8, characterized by that the potting compound or filler is paramagnetic. [10] Rotor (10) according to claim 8 or 9, characterized by , that the potting compound or the material of the filler elements has a higher elasticity than the material of the rotor body (13) and / or the material of the inserts (15) and / or the material of the permanent magnets (17). [11] Rotor (10) according to any one of claims 1 to 10, characterized by , that to form the material recesses (26) on the inserts (15) the outer radius of the respective insert (15) is gradually shortened over the circumference of the respective insert (15) and thus drawn radially inwards. [12] Rotor (10) according to any one of claims 1 to 10, characterized by, that to form the material recesses (26) on the inserts (15) the outer radius of the respective insert (15) is shortened over the circumferential extent of the respective insert (15) via a continuous function which has at least one maximum, preferably several maxima, for the outer radius of the respective insert (15) and several minima for the outer radius of the respective insert (15) and is thus drawn radially inwards. [13] Rotor (10) according to any one of claims 1 to 12, characterized by , that in the area of ​​each pole (12) between the permanent magnets (17) arranged in the V-shaped pockets (16) at least one further permanent magnet (27, 31) is arranged. [14] Rotor (10) according to claim 13, characterized by, that in the area of ​​each pole (12) between the permanent magnets (17) arranged in the V-shaped pockets (16) there are preferably two further permanent magnets (31) which are each convexly curved, are arranged in a material recess (26) of the respective insert (15) and touch the bandage (16) section by section. [15] Rotor (10) according to claim 14, characterized by , that the additional permanent magnets (31) touch the bandage (18) at circumferential positions of the respective insert (15) which lie on a straight line extending through the center of the rotor body (13) and a partial center of gravity of the respective pole (12) which is determined by at least one permanent magnet (17) arranged in one of the V-shaped pockets diverging radially outwards, the adjacent half of the respective insert (15) and the adjacent additional permanent magnet (31). [16] Rotor (10) according to claim 14 or 15, characterized bythat the inserts (15) do not touch the bandage (16). [17] Rotor (10) according to any one of claims 1 to 16, characterized by , that the outer diameter of the rotor body (13) is between 90 mm and 170 mm, preferably between 110 mm and 170 mm, particularly preferably between 120 mm and 170 mm, the inner diameter of the rotor body (13) is between 10 mm and 110 mm, preferably between 30 mm and 80 mm, particularly preferably between 40 mm and 80 mm. [18] Electric machine (11) with a rotor (10) according to one of claims 1 to 17, which is designed as a drive device of a motor vehicle, namely a hybrid vehicle or electric vehicle. [19] Motor vehicle (100), namely hybrid vehicle or electric vehicle, with an electric machine (11) serving as a propulsion device, which has a rotor (10) according to any one of claims 1 to 17.

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