Rotor of an electric machine

Abstract

The invention relates to a rotor (1) of an electric machine, wherein the rotor (1) comprises a rotor stack (2) consisting of at least two stack segments (3), each stack segment (3) comprising a plurality of individual lamellae (4) arranged in series. Furthermore, several magnet pockets (5) are formed in the rotor stack (2), with magnets (6) of at least one type (7, 9) arranged in each magnet pocket (5). The magnets (6) of at least one of the magnet pockets (5) are configured such that at least one stack segment boundary plane (10) of adjacent stack segments (3) is traversed by a magnet (6) of one type (7, 9).The magnetic pockets (5) are also formed as pocket sections (11) of the magnetic pockets (5) passing through the package segments (3), wherein at least two of the package segments (3) are rotated relative to each other by an angle of inclination (12) and at least two of the magnets (6) of at least one type of magnet (7, 9) provided in at least one of the magnetic pockets (5) are arranged offset relative to each other by the angle of inclination (12).

Description

[0001] The invention relates to a rotor of an electric machine, wherein the rotor has a rotor core consisting of at least two core segments, each of the core segments comprising a plurality of individual laminations arranged in a row. Furthermore, a plurality of magnet pockets are formed in the rotor core, with magnets of at least one magnet type being arranged in each magnet pocket. The magnets of at least one of the magnet pockets are designed such that at least one core segment boundary plane of adjacent core segments is traversed by a magnet of one magnet type.

[0002] In general, there is a constant effort to make electric drives more powerful and reliable. Especially in light of the ever-increasing use of electromobility, the aim is also to increase comfort for the occupants of electrically powered vehicles. To ensure high reliability and increased comfort, particular attention must be paid to the vibration behavior of the electric drive. The primary goal in this context is to minimize the risk of damage to electronics mounted on the drive due to strong vibrations, as well as the driving noise generated by these vibrations during operation of the drive in a motor vehicle equipped with the drive. One approach to addressing this is to shift the resonance range of the drive from the usual, correlating speed range during operation to non-critical speed or frequency ranges.

[0003] To achieve this, the rotor of the electric machine forming the drive is usually stiffened, for which several solutions are already known. One of these solutions, for example, involves casting the rotor over a highly rigid mass such as a thermoset compound using injection molding. Other solutions include gluing the rotor laminations and / or the rotor's laminated core, clamping them with screws and / or pins, or providing other elements such as lock nuts and / or press rings on the rotor shaft in order to shift the resonance range by stiffening the rotor. Combinations of the aforementioned solutions are also common. However, all of the aforementioned solutions are considered disadvantageous. Casting the rotor represents a cost- and time-intensive additional process, which also places high demands on the shape of the rotor laminations and imposes restrictions on this shape.For example, the helix angles that can be achieved in the rotor are significantly limited. Similarly, especially compared to other stacking methods such as punched stacking, gluing the rotor laminations is a solution that entails high additional costs and a high time expenditure. This also has a negative impact on the stack factor and thus the power density of the electric machine and also has only limited temperature stability. Bracing the rotor using screws and / or pins leads to undesirable short-circuiting of the rotor laminations, which causes electromagnetic losses. Furthermore, pin and / or screw connections tend to settle due to the high temperature fluctuations that occur during operation of the electric machine, so that the rotor properties deteriorate over the service life of the electric machine. A solution using press rings and / or lock nuts also has this disadvantage.Furthermore, when clamping the rotor laminations using press rings and / or lock nuts, the force is only introduced directly at the shaft-hub connection, so that the rotor laminations are only slightly clamped in the area of ​​the outer diameter.

[0004] To address this problem, other approaches from the state of the art are also known.

[0005] For example, DE 10 2019 129 243 A1 discloses a rotor for an electrical machine which has a laminated core with magnetic pockets extending in the axial direction. In the respective magnetic pockets, arrangements of several permanent magnets, some of which differ in their design, are implemented and cast in the magnetic pockets using a resin. It is described that when the magnetic pockets are cast, a small amount of the resin penetrates between the rotor laminations of the laminated core, whereby the rotor laminations are joined together in a materially bonded manner. However, due to mechanical loads during operation of the electrical machine, gaps can occur between the rotor laminations because the resin that has penetrated between the rotor laminations tears. This leads to an imbalance in the rotor and reduces the natural frequencies of the rotor, which in turn leads to undesirable noise and vibrations during operation of the rotor orof the electric machine having the rotor. It is provided that the contact regions of a respective pair of adjacent permanent magnets of a first arrangement embodied in a magnet pocket and a second arrangement of permanent magnets embodied in a further magnet pocket are offset from one another, so that, viewed in the axial direction, such a contact region of the first arrangement is covered by a permanent magnet of the second arrangement and vice versa. There are several possibilities for implementing this: On the one hand, the permanent magnets of the first and second arrangements can have partially different lengths, or on the other hand, they can have different lengths and a different number of permanent magnets can be arranged.Furthermore, it is also possible for the permanent magnets of the first and second arrangements to have the same length and for the same number of permanent magnets to be arranged, but for the arrangements in the respective magnet pockets to be axially offset from one another.

[0006] Similarly, EP 2 448 094 B1 discloses a rotor of an electrical machine with magnetic pockets formed in the laminated core of the rotor, in which the arrangements of permanent magnets formed in the magnetic pockets and the rotor laminations of the laminated core are bonded together using a resin. The laminations of the laminated core are grouped into two or three laminated core blocks, which are stacked on top of each other rotated by 120 degrees or 180 degrees to compensate for any manufacturing-related thickness variation of the laminations. This minimizes tilting errors in the laminated core as much as possible. To prevent cracks arising in the resin due to the stress on the laminated core during operation of the electrical machine from leading to separation of the laminated core blocks, it is provided that the contact areas of the respective permanent magnets formed in the magnetic pockets and the contact areas of the laminated core blocks are offset from one another.Thus, the respective contact area of ​​the laminated core blocks is covered by a permanent magnet in the axial direction. The number and length of the permanent magnets are selected accordingly, but each permanent magnet is the same length, while the lengths of the individual laminated core blocks are at least partially different.

[0007] Furthermore, DE 10 2012 112 582 A1 also describes a rotor of an electrical machine, wherein arrangements of permanent magnets are formed in magnetic pockets formed in the laminated core of the rotor. In these arrangements, too, it is provided that the contact areas of a respective pair of adjacent permanent magnets of a first arrangement formed in one magnetic pocket and a second arrangement of permanent magnets formed in another magnetic pocket are offset from one another. The arrangements are composed of two types of permanent magnets, wherein the ratio of the lengths of the permanent magnets is one to two. To implement the arrangements, it is provided that permanent magnets of the same or different types are introduced into the respective magnetic pockets, wherein the permanent magnets are in turn glued in the magnetic pockets, in particular by means of a synthetic resin.

[0008] However, the above solutions have the disadvantage of magnet arrangements, which typically lead to cogging torques between the stator and rotor. Such cogging torques are generally undesirable, except in stepper motors, for example, as they cause detrimental torque ripple and the associated uneven running, as well as minimized efficiency and reliability of the electrical machine.

[0009] Against this background, the invention is based on the object of designing the rotor of the type mentioned at the outset in such a way that stiffening of the rotor is achieved with minimized torque ripple and thus further increased running smoothness as well as efficiency and reliability.

[0010] This object is achieved with a rotor according to the features of patent claim 1. The subclaims relate to particularly expedient developments of the invention.

[0011] According to the invention, a rotor of an electrical machine, in particular an electrical machine with a rotor, is provided, wherein the rotor has a rotor core, in this case correspondingly a laminated core, consisting of at least two core segments, thus in particular laminated core segments. Each of the core segments comprises a plurality of individual laminations, in this case in particular laminated cores, arranged in a row, in particular in an axial direction of the rotor or the rotor core.

[0012] Furthermore, a plurality of magnetic pockets are formed in the rotor core, each extending in particular in the axial direction and / or circumferential direction of the rotor or rotor core, with magnets of at least one type of magnet being arranged in each magnetic pocket. The magnets of at least one of the magnetic pockets are designed, in particular in terms of shape, number, and / or arrangement, such that at least one core segment boundary plane of adjacent core segments is traversed or covered by a magnet—at least one, but preferably exclusively—of one type of magnet. The ends of a magnet traversing such a core segment boundary plane and / or a magnetic boundary plane of any two of these adjacent magnets are thus offset in the axial direction of the rotor and / or the rotor core from the traversed core segment boundary plane.Two adjacent stack segments are thus pinned together by at least one magnet, but preferably several magnets, in particular those spaced apart in the circumferential direction, which stiffens the rotor stack. This stiffening occurs essentially in the radially outer region of the rotor stack according to the design of the magnet pockets, with further stiffening being possible by bracing the rotor stack to the rotor shaft. It should also be explained that a respective stack boundary plane is spanned by the contact surface of two adjacent stack segments, with the contact surface consequently being part of the stack segment boundary plane. In a preferred embodiment, at least two, particularly preferably all, stack segment boundary planes are traversed by magnets of one type only.

[0013] Furthermore, according to the invention, the magnetic pockets are formed by pocket sections of the magnetic pockets formed in the package segments and extending completely through the package segments, with at least two of the package segments being rotated relative to one another by an angle of inclination. Due to the rotation of the package segments, it is possible, on the one hand, for the at least two pocket sections of at least one of the magnetic pockets to also be offset relative to one another by the angle of inclination. On the other hand, however, it is also possible for at least two pocket sections of at least one of the magnetic pockets to be arranged at least partially in alignment with one another despite the rotated arrangement of the package segments.

[0014] Furthermore, according to the invention, at least two of the magnets of at least one magnet type—the magnetic pocket—embodied in at least one of the magnetic pockets are arranged offset from one another by the helix angle. In addition to stiffening the rotor and the associated increase in smooth running, the helix thus formed in the rotor advantageously further increases the smooth running and efficiency of an electrical machine, in particular an electric motor, having the rotor according to the invention.

[0015] In an advantageous further development, the rotor core also contains magnetic pockets of at least, but preferably exclusively, two types of magnetic pockets that differ from one another, in particular in their geometric shape. At least one magnetic pocket of a respective type of magnetic pocket contains magnets of one or more than one type of magnet. Thus, in principle, each magnetic pocket of a respective type of magnetic pocket contains magnets of at least one type of magnet, for example, one type of magnet or two types of magnets. Accordingly, it is provided that at least parts of the magnets of at least one type of magnet—the magnetic pocket—that are incorporated in at least one of the magnetic pockets of at least one type of magnetic pocket are arranged offset from one another in the pocket sections of the magnetic pocket by the helix angle.Thus, it is conceivable that, on the one hand, at least parts of the magnets of at least one magnet type arranged in magnetic pockets of - exclusively - one type of magnetic pocket are offset from each other by the helix angle. On the other hand, it is also possible that at least parts of the magnets of at least one magnet type arranged in magnetic pockets of two or more types of magnetic pockets are offset from each other by the helix angle.

[0016] In this case, at least one, preferably exclusively, magnetic pocket of a first magnetic pocket type and at least one, but preferably exclusively, two, magnetic pockets of a second magnetic pocket type form a magnetic pocket group, wherein the rotor core comprises a plurality of the magnetic pocket groups, in particular of similar design and evenly spaced from one another in the circumferential direction of the rotor and / or the rotor core. In principle, the magnetic pockets and / or the magnetic pocket groups are formed radially on the outside of the rotor core.

[0017] A further development of the invention is also advantageous if the rotor core comprises at least one core segment of at least one—first—core segment type, in which at least, but preferably exclusively, two sections of a pocket portion offset from one another by the helix angle are formed in a respective core segment. The offset sections allow, in a structurally advantageous manner, both the traversing of the core segment boundary planes and the arrangement of magnets traversing the core segment boundary planes offset by the helix angle, particularly within a magnet pocket corresponding to a magnet pocket type.By offsetting the sections relative to one another by the helix angle, the rotation of the package segments by the helix angle can be compensated, so that, in particular in consecutive package segments, pocket sections and / or sections of at least one, preferably exclusively one, magnetic pocket type are aligned with one another and / or thus not offset by the helix angle. This allows the magnets arranged in the magnetic pocket or pockets of the respective magnetic pocket type to pass through the package segment boundary planes.

[0018] It is also advantageous if package segments of the first package segment type, in which at least two sections of a pocket section are formed that are offset from one another by the helix angle, are composed of lamella stacks of individual lamellas of two different lamella types, wherein sections that are offset from one another by the helix angle, in particular adjacent to one another, are each formed in one of the lamella stacks. This configuration allows the sections offset by the helix angle to be provided in an advantageously simple manner from a manufacturing perspective, and for this purpose they can be formed in particular during punching of the individual lamellas forming the lamella stacks. Punching represents a simple and cost-effective manufacturing process.This allows for the arrangement of similar magnets of one type only in a magnetic pocket, whereby these magnets at least partially pass through the package segment boundary planes, and the overall arrangement of the magnets virtually fills the magnetic pocket or pockets over their entire length, both axially and circumferentially. This ensures optimal utilization of the available volume or the available iron length of a magnetic pocket.

[0019] In an advantageous embodiment of the invention, it is also provided that a first relative position of a first magnetic opening of a first magnetic pocket type, which is formed in an individual lamella of a first lamella type and forms first sections of first pocket sections, to a second magnetic opening of a second magnetic pocket type, which is formed in this individual lamella type and forms second pocket sections, and a second relative position of the first magnetic opening of the first magnetic pocket type, which is formed in an individual lamella of a second lamella type and forms second sections of first pocket sections, to the second magnetic opening of the second magnetic pocket type, which is formed in this individual lamella type and forms second pocket sections, are offset from one another by the helix angle.In this way, stacks of individual slats of the first and second slat types can advantageously be used to provide package segments of the first package segment type, in which at least two sections of a pocket section are formed, offset from one another by the helix angle. The offsetting of the sections within such a package segment is achieved by arranging the stacks of individual slats of the different individual slat types in a row. Within each stack of slats, the individual slats are aligned with one another in such a way that the respective magnet openings of the magnetic pocket types are aligned with one another and thus form continuous sections of the pocket sections of the respective magnetic pocket types.However, the slat stacks consisting of the individual slats of the respective slat types and thus also the individual slats themselves are aligned with each other in such a way that the magnet openings of the second magnetic pocket type are aligned with each other over the entire pocket section formed in the package segment of the - first - package segment type and thus continuous pocket sections of the second magnetic pocket type are present, whereas the pocket sections of the first magnetic pocket type consequently have offset sections.

[0020] It is also considered extremely advantageous if the rotor core has at least one core segment of at least one, in particular further, second, or different than the first core segment type, in which core segments of this core segment type are composed of individual lamellae of a single lamella type. Core segments of such a core segment type can form the rotor core, on the one hand, in combination with core segments of the first core segment type, in which sections of a pocket section are formed that are offset from one another by the helix angle. It is preferred in this case for the rotor core to be formed by an alternating arrangement of core segments of this second core segment type and core segments of the first core segment type having offset sections.

[0021] In a further advantageous development of the invention, on the other hand, it is provided that the rotor core is constructed exclusively from core segments of the core segment type composed of individual laminations of a single lamination type - in particular a different type than the first. This advantageously minimizes the manufacturing costs for the core segments of the rotor core, since in this way, for example, only one punching tool is required to manufacture the individual laminations. Further developing this, the magnetic pockets and / or pocket sections of a first magnetic pocket type formed in the core segments of this core segment type are also curved, in particular circularly arc-shaped. Advantageously, even when the core segments are arranged rotated relative to one another by the helix angle, magnets of at least one, in particular first, magnet type can be arranged in the magnetic pockets formed in the rotor core, in particular of the first magnetic pocket type.The magnets of this - first - magnet type are also curved accordingly, whereby the magnets and the magnet pockets or pocket sections preferably have the same radius of curvature.

[0022] In one embodiment of the invention, it is thus advantageously also provided that at least two of the curved pocket sections - of the first type of magnetic pocket - which are arranged successively in the axial direction - overlap only in sections in a circumferential direction - of the rotor core and / or rotor, forming an axially aligned overlap region of a magnetic pocket - of the first type of magnetic pocket, wherein magnets of a first type of magnet are arranged in the overlap region of the magnetic pocket, passing through the boundary planes of the magnetic pocket segments. Thus, in a structurally advantageously simple manner, pinning of the rotor core can be achieved via magnets arranged in at least one magnetic pocket, here preferably of the first type of magnetic pocket, wherein the magnets arranged in this magnetic pocket or these magnetic pockets are arranged in alignment with one another, thus enabling, in particular, simplified assembly of the magnets or the rotor.In addition, a skew in the rotor or the rotor package is nevertheless realized, for example by means of magnets of a further, second or third magnet type arranged in magnet pockets of a second magnet pocket type.

[0023] A further development of the rotor according to the invention is also advantageous if magnets of at least, but preferably exclusively, two types of magnets are arranged in magnet pockets of the first type of magnet pocket. Further to this, the magnets of a second type of magnet are also designed such that they do not pass through the package segment boundary planes and are therefore preferably shorter than the respective pocket section in which the magnet is arranged. In this way, the entire volume provided by a respective pocket section and / or a respective magnet pocket, or the entire iron length, can be advantageously utilized, providing maximum power density and efficiency as well as smooth running of the rotor and / or of an electrical machine comprising the rotor, in particular an electric motor.In this case, axially adjacent magnets of the second magnet type are preferably arranged at each end of a pocket section and / or a magnet pocket of the first magnet pocket type in particular.

[0024] In a further advantageous manner, in one embodiment of the invention, the magnets of a second magnet type that do not pass through the stack segment boundary planes are arranged in a pocket section—of the first magnet pocket type—adjacent in the axial direction or circumferential direction to a magnet of the first magnet type that passes through the stack segment boundary planes. In this way, the volume provided by a respective pocket section and / or a respective magnet pocket, or the entire iron length, can be utilized extremely advantageously in rotor stacks that have stack segments of a—single—pack segment type with differing individual laminations and pocket sections with offset sections.Furthermore, the volume provided by a respective pocket section and / or a respective magnetic pocket, or the entire iron length, can also be utilized in this way in rotor cores that are composed exclusively of core segments of one core segment type with exclusively identical individual laminations. In this case, in a configuration of the rotor core with core segments of one core segment type, in which at least two partial sections of a pocket section are formed that are offset from one another by the helix angle, an arrangement of magnets of a second magnet type is preferred at each end of a pocket section and / or at each end of a magnetic pocket of the first magnetic pocket type in particular, wherein these magnets axially border magnets of the first magnet type.In a configuration of the rotor core with core segments of a core segment type, in which the core segments are composed of individual laminations of a single lamination type, with in particular curved magnet openings of the first magnet pocket type, the magnets of a second magnet type are arranged in the circumferential direction on the magnets of the first magnet type.

[0025] The invention is susceptible of numerous embodiments. To further clarify its basic principle, some of these are illustrated in the drawings and described below. The drawings show in Fig. 1a, Fig. 1b a first embodiment of the rotor; Fig. 2a, Fig. 2b Individual lamellas of a package segment type; Fig. 3 a second embodiment of the rotor; Fig. 4 a third embodiment of the rotor; Fig. 5 a detailed view of the rotor package of the third embodiment; Fig. 6 a single lamella of a package segment type of the third embodiment.

[0026] The Fig. 1a and Fig. 1b show a first embodiment of a rotor 1 according to the invention of an electrical machine not shown in detail, wherein the rotor 1 in the Fig. 1a in a perspective view and in the Fig. 1b is shown with a cutout. The rotor 1 has the rotor core 2 arranged on the rotor shaft 26 of the rotor 1, consisting of several, here specifically four, core segments 3, wherein each of the core segments 3 comprises a plurality of individual laminations 4 arranged in a row and between the core segments 3 there is a core segment boundary plane 10. Two of the core segments 3 are of a first core segment type 15 and two of a second core segment type 16, wherein the core segments 3 of the different core segment types 15, 16 are arranged alternately in the axial direction 23 on the rotor shaft 26. In this case, the core segments 3 which follow one another in the axial direction 23 are arranged rotated relative to one another by the helix angle 12 to form a helix in the rotor 1. This is particularly the case Fig. 1a.

[0027] In the radially outer region of the rotor core 2, a plurality of magnetic pockets 5 of two different magnetic pocket types 13, 14 are also formed, wherein the magnetic pockets 5 are each formed by pocket sections 11 of the magnetic pockets 5 that extend through the core segments 3. Magnets 6 of two, in turn, different magnet types 7, 9 are incorporated in the magnetic pockets 5 of the different magnetic pocket types 13, 14. The magnets 6 of the first magnet type 7, which are arranged in the magnetic pockets 5 of the first magnet pocket type 13, are designed such that one of the magnets 6 each passes through a plurality of, here specifically two, core segment boundary planes 10 of adjacent core segments 3. As a result, the respective core segments 3 are virtually pinned by the magnets 6 of the first magnet type 7, which increases the rigidity of the rotor 1 or the rotor core 2.To achieve a skew in the rotor 1 or in the rotor core 2, several of the magnets 6 of the first magnet type 7 located in the magnet pockets 5 of the first magnet pocket type 13 and all of the magnets 6 of the second magnet type 9 located in the magnet pockets 5 of the second magnet pocket type 14 are offset or rotated relative to one another by the skew angle 12, as viewed in the axial direction 23. The skew angle 12 is specifically the . Fig. 1b, where the helix angle 12 is calculated based on the representation of the Fig. 1b with a breakout appears as an offset. In order to achieve the skew of the rotor 1 or the rotor stack 2, for which purpose the magnets 6 of the first magnet type 7 arranged in the magnet pockets 5 of the first magnet pocket type 13 are partially offset from one another by the skew angle 12, and magnets 6 of this magnet type 7 can pass through the stack segment boundary planes 10, the pocket sections 11 of the stack segments 3 of the first stack segment type 15 have two sections 17, 18 offset or rotated from one another by the skew angle 12.Thus, in the twisted arrangement of the package segments 3 of the first package segment type 15 and the second package segment type 16, at least one of the sections 17, 18, here the section 17, of the pocket sections 11 formed in the package segments 3 of the first package segment type 15 is aligned with the pocket sections 11 formed in the package segments 3 of the second package segment type 16, each of the first magnetic pocket type 13.

[0028] For this purpose, the stack segments 3 of the first stack segment type 15, in which the two sections 17, 18 of the first pocket section 11 of the first magnetic pocket type 13 are formed, offset from one another by the helix angle 12, are composed of lamella stacks of individual lamellae 4 of two different lamella types 19, 20. The sections 17, 18, offset from one another by the helix angle 12, are each formed in one of the lamella stacks.

[0029] The individual lamellae 4 of the two different lamella types 19, 20 forming the lamella stacks and thus the sections 17, 18 in the package segments 3 of the first package segment type 15 are in the Fig. 2a and Fig. 2b.

[0030] The Fig. 2a shows a single lamella 4 of the first lamella type 19, in which first magnet openings 21 of the first magnet pocket type 13 are formed. These first magnet openings 21 form in the first lamella stack of the Fig. 1a and Fig. 1b, the package segments 3 of the first package segment type 15 comprise the first sections 17 of the first pocket sections 11 of the first magnetic pocket type 13. Furthermore, in the individual lamella 4 of the Fig. 2a, second magnet openings 21 of the second magnet pocket type 14 are formed, which form second pocket sections 11 of the second magnet pocket type 14 in the package segments 3 of the first package segment type 15. A first relative position exists between the first magnet openings 21 and the second magnet openings 21 of this individual lamella 4 of the first lamella type 19.

[0031] The Fig. 2b also shows a single lamella 4 of the second lamella type 20, in which first magnet openings 21 of the first magnet pocket type 13 are formed. These first magnet openings 21 form in the second lamella stack of the Fig. 1a and Fig. However, the package segments 3 of the first package segment type 15 shown in Figure 1b comprise the second sections 18 of the first pocket sections 11 of the first magnetic pocket type 13. Furthermore, in the individual lamella 4 of the Fig. 2b, second magnet openings 21 of the second magnet pocket type 14 are formed, which form second pocket sections 11 of the second magnet pocket type 14 in the package segments 3 of the first package segment type 15. A second relative position exists between the first magnet openings 21 and the second magnet openings 21 of this individual lamella 4 of the second individual lamella type 20. As shown in Fig. 2a and Fig. As can be seen in Figure 2b, the first relative position and the second relative position are offset from each other by the helix angle 12.

[0032] From the Fig. 3 shows a second embodiment of a rotor 1 according to the invention with the rotor core 2, in which magnet pockets 5 of two different magnet pocket types 13, 14 are formed. In contrast to the embodiment of the Fig. 1a and Fig. 1b, however, has package segments 3 of only one package segment type 15, which are rotated relative to one another by the helix angle 12, wherein the package segments 3 in turn consist of the Fig. 2a and Fig. 2b are composed of the individual lamellae 4 of the first lamella type 19 and the second lamella type 20. The stack segments 3 of the stack segment type 15 thus also have first pocket sections 11 with two sections 17, 18 offset from one another by the helix angle 12. Magnets 6 of the first magnet type 7 are arranged in the adjacent sections 17, 18 of neighboring stack segments 3 and thus of the magnetic pocket 5 of the first magnetic pocket type 13, said magnets passing through the stack segment boundary planes 10 of the adjacent stack segments 3 and thus pinning the stack segments 3 together. In order to utilize the full length of the magnetic pockets 5 of the first magnetic pocket type 13, in addition to the magnets 6 of the first magnet type 7, magnets 6 of the second magnet type 8 are also arranged in the magnetic pockets 5 of the first magnetic pocket type 13.These magnets 6 of the second magnet type 8 are arranged at each end of the rotor core 2 and, in the axial direction 23, adjacent to a magnet 6 of the first magnet type 7, which runs through the core segment boundary planes 10. They differ from the magnets 6 of the first magnet type 7 in that they are shorter and, moreover, shorter than a pocket section 11. The magnets 6 of the second magnet type 8 therefore do not run through the core segment boundary planes 10. Furthermore, magnets 6 of the third magnet type 9 are arranged in the second pocket sections 11 of the magnet pockets 5 of the second magnet pocket type 14, which, like the magnets 6 of the first and second magnet pocket types 7, 8, are offset from one another by the helix angle 12.

[0033] The Fig. 4 further shows a third embodiment of a rotor 1 according to the invention with the rotor core 2, wherein the rotor core 2 again has a plurality of core segments 3 consisting of a plurality of individual laminations 4, wherein only parts of the core segments 3 are arranged rotated relative to one another by the helix angle 12. In this case, the core segments 3 are also of the core segment type 16, in which the core segments 3 are composed of individual laminations 4 of a single lamination type 22. In this case, the magnetic pockets 5 and thus the first pocket sections 11 of the first magnetic pocket type 13 are curved and, in particular, arcuate, which Fig. 5. Magnets 6 of the first magnet type 7 are also formed in the magnet pockets 5 of the first magnet pocket type 13, which fill the entire length of the magnet pocket 5 of the first magnet pocket type 13 and in doing so pass through the stack segment boundary planes 10 of the adjacent stack segments 3, thus pinning the stack segments 3 to one another. In order to achieve the skew of the rotor 1 or the rotor stack 2 and the pinning of the stack segments 3 by the magnets 6 of the magnet type 7 by these passing through the stack segment boundary planes 10, the arc length of the magnets 6 of the first magnet type 7 is less than the arc length of the first pocket sections 11 of the magnet pockets 5 of the first magnet pocket type 13.Due to the rotation of the stack segments 3 by the helix angle 12, any two of the curved first pocket sections 11 of the first magnetic pocket type 13, which are arranged consecutively in the axial direction 23, only overlap in sections in the circumferential direction 24, thereby forming the axially aligned overlap region 25 of the magnetic pocket 5 of the first magnetic pocket type 13. The magnets 6 of the first magnet type 7, which pass through the stack segment boundary planes 10, are arranged accordingly in this overlap region 25 of the magnetic pocket 5. Thus, the magnets 6 of the first magnet type 7 only partially fill the first pocket sections 11 of the first magnetic pocket type 13.In order to ensure a virtually complete filling of the first pocket sections 11, in addition to the magnets 6 of the first magnet type 7 in the first pocket sections 11 of the first magnet pocket type 13, magnets 6 of the second magnet type 8 are also arranged, which do not pass through the package segment boundary planes 10 and are therefore shorter than the magnets 6 of the first magnet type 7 and in particular are slightly shorter than the pocket sections 11 of the first magnet pocket type 13 themselves. The magnets 6 of the second magnet type 8, which do not pass through the package segment boundary planes 10, are accordingly arranged in the respective pocket sections 11 of the first magnet pocket type 13 in the manner shown in . Fig. 5, adjacent to a magnet 6 of the first magnet type 7 passing through the package segment boundary planes 10. In the successive pocket sections 11, these strike the magnets 6 of the first magnet type 7, partly alternately, on different sides. Furthermore, in the embodiment of the rotor 1 of the Fig. 4, as in the embodiments of the rotors 1 of the Fig. 1a and Fig. 1b and 3, in the second pocket sections 11 of the magnet pockets 5 of the second magnet pocket type, 14 magnets 6 of the third magnet type 9 are arranged, which are offset from one another by the helix angle 12. In this case, the helix of the rotor 1 or the rotor core 2 changes direction and is in the opposite direction starting from the axial center of the rotor core.

[0034] The arrangement of the magnets 6 of the third magnet type 9 in the magnet pockets 5 of the second magnet pocket type 14 as well as the curved design of the magnet pockets 5 of the first magnet pocket type 13 is shown again in the detailed illustration of the Fig. 5. In addition, the Fig. 5 also shows again the arrangement of the magnets 6 of the first and second magnet types 7, 8 adjacent to one another in the circumferential direction 24.

[0035] The Fig. 6 also shows a single lamella 4 of lamella type 22, over which the package segments 3 of the package segment type 16 of the design of the rotor package 2 of the Fig. 4. In the individual lamella 4, the curved, here arc-shaped magnet openings 21 of the first type of magnet pocket 13 and the magnet openings 21 of the second type of magnet pocket 14 are formed, which form the corresponding Fig.4 shown pocket openings 11 of the first and second magnetic pocket types 13, 14. List of reference symbols 1 rotor 2 rotor pack 3 package segment 4 single slats 5 magnetic pockets 6 Magnet 7 types of magnets 8 types of magnets 9 magnet types 10 Packet segment boundary level 11 Pocket section 12 helix angles 13 Magnetic pocket type 14 Magnetic pocket type 15 Packet segment type 16 Packet segment type 17 sections 18 sections 19 Slat type 20 slat type 21 Magnet opening 22 slat type 23 axial direction 24 Circumferential direction 25 Overlap area 26 Rotor shaft QUOTES CONTAINED IN THE DESCRIPTION

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

[0000] DE 10 2019 129 243 A1

[0005] EP 2 448 094 B1

[0006] DE 10 2012 112 582 A1

[0007]

Claims

[1] Rotor (1) of an electrical machine, wherein the rotor (1) has a rotor core (2) made up of at least two core segments (3), each of the core segments (3) comprising a plurality of individual laminations (4) arranged in a row, wherein a plurality of magnet pockets (5) are formed in the rotor core (2) and magnets (6) of at least one magnet type (7, 8, 9) are arranged in a respective magnet pocket (5), wherein the magnets (6) of at least one of the magnet pockets (5) are designed such that at least one core segment boundary plane (10) of adjacent core segments (3) is traversed by a magnet (6) of one magnet type (7, 8, 9), characterized byin that the magnetic pockets (5) are formed by pocket sections (11, 22) of the magnetic pockets (5) passing through the package segments (3), wherein at least two of the package segments (3) are rotated relative to one another by an inclination angle (12) and at least two of the magnets (6) of at least one magnet type (7, 8, 9) implemented in at least one of the magnetic pockets (5) are arranged offset from one another by the inclination angle (12). [2] Rotor (1) according to claim 1, characterized by in that magnetic pockets (5) of at least two mutually different magnetic pocket types (13, 14) are formed in the rotor package (2), wherein magnets (6) of one or more than one magnet type (7, 8, 9) are implemented in at least one magnetic pocket (5) of a respective magnetic pocket type (13, 14). [3] Rotor (1) according to claims 1 or 2, characterized byin that the rotor core (2) has at least one core segment (3) of at least one core segment type (15), in which at least two sections (17, 18) of a pocket section (11) offset from one another by the helix angle (12) are formed in a respective core segment (3). [4] Rotor (1) according to at least one of the preceding claims, characterized by that package segments (3) of the package segment type (15), in which at least two sections (17, 18) of a pocket section (11) are formed, which are offset from one another by the helix angle (12), are composed of lamella stacks of individual lamellas (4) of two mutually different lamella types (19, 20), wherein sections (17, 18) offset from one another by the helix angle (12) are each formed in one of the lamella stacks. [5] Rotor (1) according to at least one of the preceding claims, characterized bythat a first relative position of a magnetic opening (21) of a first magnetic pocket type (13) formed in an individual lamella (4) of a first lamella type (19), which forms first sections (17) of pocket sections (11) of the first magnetic pocket type (13), to a magnetic opening (21) of a second magnetic pocket type (14) formed in this individual lamella (4), which forms second pocket sections (11) of the second magnetic pocket type (14), and a second relative position of the magnetic opening (21) of the first magnetic pocket type (13) formed in an individual lamella (4) of a second lamella type (20), which forms second sections (18) of pocket sections (11) of the first magnetic pocket type (13), to the magnetic opening (21) of the second magnetic pocket type (14) formed in this individual lamella (4), which forms pocket sections (11) of the second magnetic pocket type (14), in order to Helix angles (12) are offset from one another. [6] Rotor (1) according to at least one of the preceding claims, characterized by that the rotor core (2) has at least one core segment (3) of at least one core segment type (16), in which core segments (3) of this core segment type (16) are composed of individual lamellae (4) of a single lamella type (22). [7] Rotor (1) according to at least one of the preceding claims, characterized by that the rotor core (2) is designed exclusively from core segments (3) of the core segment type (16) composed of individual lamellae (4) of a single lamella type (22), wherein the magnetic pockets (5) and / or pocket sections (11) of a first magnetic pocket type (13) are curved. [8] Rotor (1) according to at least one of the preceding claims, characterized byin that at least two of the curved pocket sections (11) of the first type of magnetic pocket (13) which follow one another in the axial direction (23) only overlap in sections in a circumferential direction (24), forming an axially aligned overlapping region (25) of a magnetic pocket (5), wherein magnets (6) of a first type of magnet (7) passing through the package segment boundary planes (10) are arranged in the overlapping region (25) of the magnetic pocket (5). [9] Rotor (1) according to at least one of the preceding claims, characterized by that magnets (6) of at least two types of magnets (7, 8) are arranged in magnet pockets (5) of the first type of magnet pocket (13), wherein the magnets (6) of one type of magnet (7, 8) are designed such that they do not pass through the package segment boundary planes (10). [10] Rotor (1) according to at least one of the preceding claims, characterized bythat the magnets (6) of a second magnet type (8) which do not pass through the package segment boundary planes (10) are arranged in a pocket section (11) of the first magnet pocket type (13) in the axial direction (23) or in the circumferential direction (24) adjacent to a magnet (6) of the first magnet type (7) passing through the package segment boundary planes (10).

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