Rotor of a rotary electric machine, method for producing the rotor, and rotary electric machine

Abstract

The invention relates to a rotor of a rotary electric machine, to a method for producing the rotor, and to the rotary electric machine itself. The rotor comprises a rotor lamination body (1) comprising a plurality of ring assemblies (20) of sheet-metal ring segments (30), which ring assemblies are arranged axially one behind the other in at least one stack (10, 11), wherein the stack (10, 11) contains ring assemblies (20) which are offset in the peripheral direction with respect to axially adjacent ring assemblies (20) such that the ring segments (30) of mutually adjacent ring assemblies (20) each have axial regions of overlap (32) in common angle ranges, and wherein, in regions of overlap (32), at least one passage opening (40) extends through ring segments (30) arranged axially one behind the other, and cast material strands (41) are arranged in the passage openings (40) in order to fix the ring segments (30) against centrifugal forces that act as the rotor rotates. Thanks to the rotor proposed here, the method for producing the rotor, and the rotary electric machine itself, solutions are provided which allow the laminated cores and the rotor lamination body assembled therefrom to be produced simply and inexpensively.

Description

[0001] Rotor of an electric rotary machine, method for producing the rotor and electric rotary machine

[0002] The invention relates to a rotor of an electric rotary machine, a method for producing the rotor and the electric rotary machine itself.

[0003] Electric drive motors are known from the state of the art in many industrial applications, and are also increasingly being used in the automotive industry. Such a motor comprises a stator and a rotor that rotates relative to it. The rotor typically includes a rotor shaft, balancing plates, rotor cores, and magnets. The magnets are fixed in the rotor cores. The rotor cores are often interleaved to smooth the torque to be transmitted.

[0004] The lamination stacks are fixed to the rotor shaft. The strength of the connection between the shaft and the lamination stack depends on the speed and the resulting centrifugal forces, as well as the radial overlap between the lamination stack and the rotor shaft.

[0005] The production of the lamination stacks or individual laminations involves considerable material costs. Possible ways to reduce costs include increasing the rotor's power density to achieve greater efficiency while maintaining the same material usage.

[0006] Another option is to maximize the use of raw sheet material through clever cutting. One approach to this is the segmentation of rotors or their sheets. However, segmenting rotor sheets requires even greater mitigation of centrifugal forces that occur at higher speeds.

[0007] To solve this problem, there are, among other things, bandages, such as those made of fiber-reinforced plastic, the realization of a positive connection between individual segments or segments and the rotor carrier, or even the transfer of centrifugal forces to elements located outside the active length.

[0008] Different design approaches for the formation of the laminated cores and their fixation are known.

[0009] Thus, DE102012013836A1 discloses a connecting arrangement of a first ring segment, which has at least one first form-locking element of a form-locking arrangement, with at least one second ring segment, which has at least one second form-locking element of the form-locking arrangement, of a ring element for an electrical machine, in which the ring segments are connected via the mutually interacting and in each case at least two in

[0010] The form-locking elements comprising successive form-locking regions in the circumferential direction of the ring element are positively connected to one another in the circumferential direction to form a respective form-locking connection of the form-locking arrangement, wherein at least one further form-locking connection of the ring segments is provided in the radial direction, at least on the outside of the form-locking arrangement, by means of which one of the ring segments is covered outwardly in the radial direction by the other ring segment to support the form-locking arrangement. Accordingly, puzzle-piece-like form-locking elements are used that can engage with one another.

[0011] US2012126658 A1 discloses that a rotor core for a rotating electrical machine comprises a plurality of annular core plates. The core plates are formed by joining arcuate segments. The core plate segments each include a protruding portion formed on one surface of each of the segments and having an arcuate end in the circumferential direction, and a depressed portion formed on the other surface and having an end. The circumferential direction is arcuate, and the protruding portion of the core plate segment of another layer is adapted to it when the core plates are laminated. An interference fit is provided in the radial direction between the width of the protruding portion of the core plates and the depressed portion of the core plates, and a loose fit is provided in the circumferential direction.Furthermore, each of the core plate segments is provided with a plurality of magnet insertion holes into which permanent magnets, such as neodymium magnets, are inserted. A plurality of fastening portions are provided for fastening the plurality of stacked core plates. The magnet insertion holes and the fastening portions are formed in the circumferential direction of the core plate segment. The fastening portions are respectively provided on the inner circumferential sides of the two end portions of each magnet insertion hole. The fastening portions are fastened after the core plates are temporarily assembled, so that the overall configuration of the core plates can be maintained in the rotor core without falling apart. The fastening portions each include a protruding portion, such as a dowel.

[0012] US2016094098 A1 discloses a rotor with a rotor core and permanent magnets. The rotor core comprises annular bodies stacked in a stacking direction and each consisting of core segments arranged along a circumferential direction. The number of core segments in each of the annular bodies is determined based on k, where k is the number of magnetic poles formed by the permanent magnets. The rotor core has n through-holes, where n^k. The rotor further comprises n fastening elements, each extending in the stacking direction through a corresponding through-hole of the rotor core. A gap is formed between each circumferentially adjacent pair of core segments, which gap is larger than a distance provided between the through-holes of the rotor core and the fastening elements.At least one of the annular bodies is circumferentially offset from another annular body by an integer multiple of a magnetic pole. Furthermore, this document teaches the use of puzzle-piece-like end sections of the segments. The fastening elements used can be rivets or pins.

[0013] Based on this, the present invention is based on the object of providing a rotor of an electric rotary machine, a method for producing the rotor and the electric rotary machine itself, which enable simple and cost-effective production of the laminated cores and the rotor laminated body assembled therefrom.

[0014] This object is achieved by the rotor according to claim 1, by the method for producing the rotor according to claim 9, and by the electric rotary machine according to claim 10. Advantageous embodiments of the rotor are specified in subclaims 2-8.

[0015] The features of the claims can be combined in any technically reasonable manner, whereby the explanations from the following description as well as features from the figures can also be used to comprise additional embodiments of the invention.

[0016] In the context of the present invention, the terms “radial”, “axial” and “circumferential direction” always refer to the axis of rotation of the rotor.

[0017] The invention relates to a rotor of an electric rotary machine, which has a rotor laminated body comprising a plurality of ring arrangements of ring segments made of sheet metal arranged axially one behind the other in at least one stack, wherein the stack contains ring arrangements which are offset along the circumferential direction with respect to axially adjacent ring arrangements, so that the ring segments of respectively adjacent ring arrangements each have an axial overlap area in common angular ranges.

[0018] Ring segments arranged axially one behind the other are penetrated by at least one through-hole in overlapping areas, and cast material strands are arranged in the through-holes to secure the ring segments against centrifugal forces acting during rotor rotation. A ring arrangement forms a ring in a plane composed of several ring segments.

[0019] The through-hole penetrating the axially arranged ring segments comprises partial through-holes formed in each ring segment, which together form the through-hole. The circumferential offset creates a so-called "brick wall." The overlap area is an angular area where one ring segment rests against an adjacent ring segment. The overlap area can be up to half or more than half the area of ​​the respective ring segment. The cast material strands serve to transmit forces between individual sheets. This creates a mechanical connection between the individual sheets, allowing centrifugal forces to be absorbed by the cast material strands.

[0020] The cast material strands may contain aluminum. The aluminum-containing material may be an aluminum alloy.

[0021] Compared with previously known embodiments which also use a cast material, such as epoxy resins, this embodiment has the advantage of increased mechanical strength, in particular over the service life, with the associated advantageous property that the cast aluminum can be designed with a comparatively small cross-section.

[0022] In addition, for the purpose of recycling, the introduced aluminum or the introduced aluminum alloy can be heated to a relatively low temperature, for example to a temperature significantly below the melting temperature of surrounding materials, e.g. magnetic material, electrical steel, steel parts, and thus liquefied, in order to be easily removed from the rotor laminations.

[0023] The ring segments can have magnetic pockets for accommodating magnets to form magnetic poles, wherein circumferentially offset ring arrangements are offset from an adjacent ring arrangement by the number of magnetic pockets associated with at least one magnetic pole. In other words, this embodiment provides for the ring segments to be offset by at least one magnetic pole.

[0024] At least two of the cast material strands can be mechanically connected to each other. This design serves, in particular, to increase the mechanical strength of the ring assembly. Centrifugal forces are converted into tangential tensile forces in the mechanical connections between the ring segments.

[0025] The mechanical connection of cast material strands can be realized in the form of at least one balancing element connecting the cast material strands. This balancing element can be created during the casting process for producing the cast material strands. In this embodiment, the cast material strands can apply an axial preload to the ring segments in addition to the positive locking of the ring segments in the radial direction.

[0026] In an alternative embodiment, instead of forming a mechanical connection between the cast material strands, each cast material strand has a thickened axial end to achieve an axial blocking effect and thus be able to apply axial preload to the ring segments and / or to hold the ring segments in their axial positions. When implementing a balancing element, it can be provided that a flow channel is formed in the balancing element during casting.

[0027] Furthermore, at least one magnet accommodated in a magnet pocket can be fixed in a form-fitting and / or force-fitting manner by means of cast material introduced into the magnet pocket.

[0028] In one embodiment, the casting material introduced into the magnetic pockets creates a material-to-material bond between the introduced casting material and a respective magnet. This means that direct contact is established between the introduced casting material and the respective magnet, which, in addition to the positive and / or non-positive connection, fixes the magnet in the magnetic pocket.

[0029] Introduced cast material can also be used to create a positive connection with a rotor shaft, in that the cast material forms a driver element or a so-called spring, which sits both in a groove formed in the laminated core and in a groove formed in the rotor shaft. The rotor laminated core can have a plurality of stacks formed from ring arrangements axially one behind the other, wherein axially adjacent stacks are arranged rotated with respect to one another, and at least one of the through openings and a cast material strand therein extends through a plurality of stacks. This means that subdivisions of the ring arrangements into ring segments of one stack are arranged at different angular positions with respect to the subdivisions of the ring arrangements into ring segments of an axially adjacent stack. As a result, the individual stacks form a weak helical shape.

[0030] This helix shape can be a non-continuous helix shape.

[0031] Furthermore, a so-called arrow entanglement can also be implemented, in which entanglements are executed in different directions, such as with three subpackets, where the middle subpacket is rotated relative to the other two subpackets. This results in two helices, or, viewed from the side, the shape of an arrow, or the shape of a greater-than or less-than sign.

[0032] In a particular embodiment, the rotor lamination body comprises individual laminations, instead of interlaced stacks of ring arrangements, which are arranged interlaced with one another, so that the realized helix shape is almost continuously formed.

[0033] The angle by which the interlacing or twisting along the circumferential direction of the stacks is realized can be, for example, between 1 and 9° per stack, such as 3°.

[0034] This through-hole is designed to be linear, for example. The linear design facilitates casting because it eliminates the protrusions formed by the ring segments in the casting channel.

[0035] Accordingly, despite the interlacing of adjacent stacks, the overlap areas between ring segments of adjacent stacks are sufficiently large to accommodate at least one through-hole penetrating several stacks, and within this through-hole, a cast material strand can be arranged that penetrates several stacks. The proposed rotor enables simple and cost-effective production of the individual rotor laminations, combined with the absorption and distribution of centrifugal forces, without the need for puzzle-piece-like connecting elements between the individual ring segments or the need for numerous mechanical connectors.

[0036] A further aspect of the present invention is a method for producing a rotor of an electric rotary machine, in which ring segments made of sheet metal are provided, each having at least one through-opening and which are arranged in ring arrangements which, arranged axially one behind the other, form at least one stack which realizes at least part of a rotor sheet metal body.

[0037] Furthermore, ring arrangements are arranged in the stack in such a way that they are offset from axially adjacent ring arrangements along the circumferential direction, so that the ring segments of adjacent ring arrangements each have an axial overlap area in common angular areas.

[0038] Material is poured into partial through-openings of ring segments arranged axially one behind the other, which form at least one common through-opening in overlapping areas, in order to form cast material strands there.

[0039] The presented method can be described, for example, using the rotor of a permanent magnet synchronous machine.

[0040] To create the individual ring segments, they are punched from raw sheet material. Each ring segment can extend over at least two magnetic poles. If the magnet topology does not provide for any magnetic material in the center of the respective pole, such as in a V-arrangement or a double-V arrangement, it is recommended to place the separation between two ring segments in the center of the pole, as no magnetic flux runs over the punched edges here. For magnet topologies that do not allow this, such as a tangential arrangement, delta arrangement, U-arrangement, double V+T arrangement of the magnets or magnetic poles, the dividing line between two ring segments can run between two magnetic poles. Each ring segment has at least one partial through-opening, which together with the partial through-openings of the other ring segments forms a through-opening in the laminated core.

[0041] The number of through-openings per ring segment can be a multiple of the number of magnetic poles or the corresponding magnetic pockets in the respective ring segments.

[0042] If the dividing line between two ring segments lies in the center of the pole, the through-holes are located between two poles. If the dividing line between two ring segments lies between the poles, the through-holes are located within the pole.

[0043] If the rotor is to have multiple stacks of ring arrangements that are rotated or interlaced relative to one another, the through-holes in the rotor laminations can be arranged offset by half the interlacing angle along the circumferential direction. Such ring segments, equipped with through-holes offset by half the interlacing angle, can be arranged in a mirror-image manner in the individual stacks. In this way, adjacent stacks, each rotated by half the interlacing angle, form a complete interlacing angle between them. If multiple different interlacing angles are provided in a rotor, it is necessary to provide ring segments with different punching patterns or with through-holes offset differently along the circumferential direction.If a positive shaft-hub connection, such as a spline, is provided between the laminated core and the rotor shaft, it must be adapted to the number of ring segments present in the ring arrangements. The number of form elements of the shaft-hub connection distributed around the circumference must be a multiple of the number of ring segments.

[0044] The inner diameter of the ring assembly should be selected to ensure sufficient sheet metal for the magnetic flux to be conducted. The larger the inner diameter, the less material is required. The ring assemblies can be arranged in stacks using domes that are inserted into the through holes. Alternatively, or in addition, a positive fit of a shaft-hub connection with a replacement shaft can be used to align the ring assemblies.

[0045] Alternatively or additionally, the sheet stack can be aligned along its outer contour using a hollow cylindrical alignment aid.

[0046] A material, such as an aluminum-containing material, is introduced into the through-openings formed by the individual through-part openings by means of casting, which then hardens in the through-openings and forms material strands.

[0047] In addition, the cast material can also be used to form at least one balancing element, for example, in the axial end region of a laminated core. Such a balancing element can be provided with one or more flow channels that serve to realize centrifugal cooling by utilizing centrifugal forces.

[0048] Any axially leaked cast material or portions of the balancing element can be removed, such as by turning, after the cast material has hardened. For a simple tool design for the casting process, it is recommended to design such a channel as open in the axial direction and to provide draft angles in the axial direction to eliminate the need for additional slides during casting. Alternatively, such a channel can also be created at a later time by inserting at least one radial bore into the balancing element.

[0049] Pure aluminum or an aluminum die-casting alloy such as aluminum alloy AISi9Cu3(Fe) or A380 can be used as the casting material, which are relatively inexpensive, ensure high strength values ​​as well as good processability and recycling capabilities, while at the same time having a lower tendency to porosity formation compared to pure aluminum.

[0050] During the casting process, a shaft can be connected to the laminated core. Here, a form-fit connection can be created by the cast material, which then takes on the function of torque transmission. During final machining, both the outer diameter of the rotor core and the bearing seats can be turned to their final dimensions in the same setup. For this purpose, it is recommended that the shafts be equipped with appropriate formed elements to enable clamping beyond the bearing seats. For a solid shaft, this could be two centers on the end faces of the shaft. Hollow shafts with inner diameters turned at least on the end faces can also be accommodated beyond this diameter using tapers. If the outer diameter of the rotor core and the bearing seats are turned in a single setup, the tolerance chain is reduced, particularly that of the concentricity deviations.This reduces the maximum imbalance before the balancing process, so that the thickness of a balancing element used can also be reduced, with the advantage of reduced material usage and a relatively low weight.

[0051] Optionally, the cast material can also be used to fix the magnets in the magnetic pockets. Here, it must be ensured that the magnets used and their coatings can withstand the temperature of the liquid, cast material for short periods without damage. It cannot be ruled out that the cast material in the magnetic pockets forms cast material strands that absorb tangential tensile forces for the purpose of fixing the ring segments. However, attention must be paid to the strength of stray webs and thus the influence on the magnetic circuit. When applying the invention to manufacture a three-phase asynchronous machine, the through openings can be used to fix the winding, as well as for the described force absorption. For such a machine, it is advisable to use pure aluminum as the cast material due to the advantageous high conductivity required.

[0052] Furthermore, a relatively large inner diameter of the ring arrangements can be designed for this three-phase asynchronous machine, with the advantages of reducing the moment of inertia of the rotor, reducing the material used in the rotor laminations, reducing the centrifugal forces acting on the ring segments and thus increasing the mechanical strength and thus also the bursting speed, and in the case of an oil-flowing rotor, a smaller distance from the shaft / rotor carrier inner diameter to the magnets and thus lower thermal resistance.

[0053] In electrical rotating machines that have magnets in the rotor, the simultaneous casting of the magnets can potentially achieve a significant reduction in the temperature of the magnets during operation, which makes it possible to use magnets of lower grade and thus save material costs and avoid the use of heavy rare earth metals.

[0054] In synchronous reluctance motors, the through-holes or the material strands arranged therein can also be used for mechanical power transmission in the laminated core.

[0055] The invention further provides an electric rotary machine having a rotor as described or a rotor manufactured according to the method described. The electric rotary machine can be a permanent magnet synchronous machine, a three-phase asynchronous machine, a separately excited synchronous machine, or a reluctance motor.

[0056] The invention described above will be explained in detail below against the relevant technical background with reference to the accompanying drawings, which show preferred embodiments. The invention is in no way limited by the purely schematic drawings, whereby it should be noted that the embodiments shown in the drawings are not limited to the dimensions shown. It is shown in

[0057] Figure 1 : a ring segment in plan view,

[0058] Figure 2: a ring arrangement in plan view,

[0059] Figure 3: a schematic representation of mutually twisted ring arrangements, Figure 4: a schematic view of a first stack of ring arrangements, Figure 5: a rotor lamination body in frontal view with inserted magnets, Figure 6: a rotor lamination body with balancing element arranged thereon,

[0060] Figure 7: a partial area of ​​a ring segment with magnets and cast material arranged therein, Figure 8: a rotor lamination body composed of two stacks in a sectional view with magnets, and

[0061] Figure 9: a section of a ring segment in connection with a rotor shaft.

[0062] Figure 1 shows a top view of a ring segment 30. It can be seen that this ring segment 30 extends only within an angular range of approximately 72°. The ring segment 30 comprises four magnetic pockets 70, each of which is arranged in a V-shape relative to the other and is designed to accommodate magnets of a magnetic pole. On the radial inner side, the ring segment 30 comprises four through-openings 33 in the form of holes or bores.

[0063] Figure 2 shows a ring arrangement 20 composed of five ring segments 30. These ring segments 30 together form a closed ring, with the ring segments 30 being separated from one another by respective partitions 31. Such a ring arrangement 20 forms an equivalent of a rotor lamination of a rotor lamination stack running in a plane.

[0064] However, the axially successively arranged ring arrangements 21 of a respective stack are not arranged such that the separations 31 between the ring segments 30 are all arranged in the same angular positions, but rather adjacent ring arrangements 21 are arranged offset from one another in the circumferential direction, as illustrated in Figure 3.

[0065] Here, three ring arrangements 20 are visible, arranged layer by layer in a stack, with the separations 31 between ring segments 30 only being present in every second ring arrangement 20. This realizes the principle of a so-called "brick wall." The relative rotation of adjacent ring arrangements 20 can, for example, be half the angle subtended by the ring segments 30.

[0066] Figure 3 also shows that axial through-openings 40 extend through the ring arrangements 20 in overlapping areas 32, in which the ring segments 30 overlap along the circumferential direction. These through-openings are formed from the individual partial through-openings 33 explained in relation to Figure 1. Strands of cast material 41 extend through the through-openings 40. It is evident that these strands of material 41 fix the ring segments 30 to one another in the circumferential direction via adjacent ring arrangements 20, so that the ring segments 30 are fixed in their radial positions against counteracting centrifugal forces.

[0067] Figure 4 schematically illustrates the design of a rotor lamination core (not shown in full here). It shows a frontal view of a first stack 10 of the rotor lamination core. Axially behind it is a second stack of ring arrangements, which is only indicated here by the fact that this second stack is rotated clockwise by a relatively small angle relative to the first stack 10 shown, as indicated by the dashed lines that illustrate the positions of the magnetic pockets 72 of the second stack. This results in what is known as interlacing of the stacks.

[0068] Figure 5 shows a rotor lamination body 1 in a frontal view, although only the frontal view of the first stack 10 is visible here. Furthermore, it can be seen here that magnets 71 are accommodated in the magnet pockets 70, with two magnets 71 arranged in a V-shape relative to each other forming a respective magnetic pole 50.

[0069] The through openings 40 are designed to receive strands of cast material in order to fix the ring segments 30 in their positions in the manner described.

[0070] Figure 6 shows a perspective view of the axial end region of a first stack 10 of the rotor lamination body 1. On the front side, a balancing element 61 in the form of a balancing disk made of cast material is formed, which at the same time realizes a mechanical connection 60 of the material strands of the cast material running in the through openings 40, not shown here.

[0071] This balancing element 61 can have radial bores or openings created during the casting process, which function as components of a cooling channel. Figure 7 shows a special embodiment of the fixation of the magnets 71 in the magnet pockets 70. This is achieved by introducing, in addition to the magnets 71, casting material 80 into the magnet pockets 70, which fixes the magnets 71 in a force-fitting, form-fitting, and / or material-fitting manner. Furthermore, it is also shown here that the through-openings 33 are filled with the material strand 41 of cast material.

[0072] Figure 8 shows a rotor lamination body 1 comprising a first stack 10 and a second stack 11 of layered ring arrangements. Here, the interlacing between the two stacks 10, 11 is evident, since in the sectional view shown here, the magnets 71 are each only partially sectioned. However, it is also evident that the through-opening 40 extends linearly through both stacks 10, 11, and thus also the material strand 41 of cast material formed therein.

[0073] The rotor lamination body 1 has a balancing element 61 on each of its two axial sides, which realizes mechanical connections 60 of the material strands 41 in the through openings 40.

[0074] A further possible embodiment is shown in Figure 9, where it can be seen that at least one of the ring segments 30 is connected by means of a positive connection to a rotor shaft 90, which is only partially shown here and is designed as a hollow shaft. Here, the ring segment 30 shown comprises a groove on its radial inner side, which thus forms a groove in the laminated core 92 when all ring segments are arranged in the same angular position. The rotor shaft 90 also comprises a groove in the rotor shaft 91 on its radial outer side. Cast material 80, which was poured into the grooves 91, 92, forms a driver element 100 after hardening, which prevents displacement of the ring segment 30 in the circumferential direction relative to the rotor shaft 90 and can therefore be used to transmit torque between the rotor and the rotor shaft.

[0075] The rotor proposed here, the method for manufacturing the rotor, and the electric rotating machine itself provide solutions that enable simple and cost-effective production of the laminated cores and the resulting rotor core.

[0076] 1 rotor lamination body

[0077] 10 First stack

[0078] 11 Second stack

[0079] 20 ring arrangement

[0080] 30 ring segments

[0081] 31 Separation

[0082] 32 Coverage area

[0083] 33 Passage opening

[0084] 40 passage opening

[0085] 41 material strand

[0086] 50 magnetic pole

[0087] 60 mechanical connection

[0088] 61 Balancing element

[0089] 70 magnetic pocket

[0090] 71 Magnet

[0091] 72 Magnetic pocket of the second stack

[0092] 80 Casting material

[0093] 90 rotor shaft

[0094] 91 Groove in the rotor shaft

[0095] 92 groove in the sheet package

[0096] 100 driver element

Claims

Patent claims 1. Rotor of an electrical rotary machine, comprising a rotor laminated body (1) which comprises a plurality of ring arrangements (20) of ring segments (30) made of sheet metal, arranged axially one behind the other in at least one stack (10, 11), wherein the stack (10, 11) contains ring arrangements (20) which are offset along the circumferential direction with respect to axially adjacent ring arrangements (20), so that the ring segments (30) of respectively adjacent ring arrangements (20) each have an axial overlap region (32) in common angular regions, and wherein ring segments (30) arranged axially one behind the other are penetrated by at least one through-opening (40) in overlap regions (32), and cast material strands (41) are arranged in the through-openings (40) in order to fix the ring segments (30) against centrifugal forces acting during rotation of the rotor.

2. Rotor according to claim 1, characterized in that the cast material strands (41) comprise aluminum as the material.

3. Rotor according to one of the preceding claims, characterized in that the ring segments (30) have magnetic pockets (70) for receiving magnets (71) for forming magnetic poles (50), wherein ring arrangements (20) offset in the circumferential direction are offset from an adjacent ring arrangement (20) by the number of magnetic pockets (70) assigned to at least one magnetic pole (50).

4. Rotor according to one of the preceding claims, characterized in that at least two of the cast material strands (41) are mechanically connected to one another.

5. Rotor according to claim 4, characterized in that the mechanical connection (60) of cast material strands (41) is realized in the form of at least one balancing element (61) connecting the cast material strands (41).

6. Rotor according to one of claims 3 to 5, characterized in that at least one magnet (71) accommodated in a magnet pocket (70) is fixed in a form-fitting and / or force-fitting manner by means of cast material (80) introduced into the magnet pocket (71).

7. Rotor according to claim 6, characterized in that by means of the casting material (80) introduced into the magnet pockets (70), a material-locking connection is realized between the introduced casting material (80) and a respective magnet (71).

8. Rotor according to one of the preceding claims, characterized in that the rotor laminated body (1) has a plurality of stacks (10, 11) formed from ring arrangements (20) arranged axially one behind the other, wherein axially adjacent stacks (10, 11) are arranged rotated with respect to one another, and at least one of the through-openings (40) and a cast material strand (41) therein extends through a plurality of stacks (10, 11).

9. A method for producing a rotor of an electrical rotary machine, in which ring segments (30) made of sheet metal are provided, each having at least one through-opening (33) and which are arranged in ring arrangements (20) which, arranged axially one behind the other, form at least one stack (10, 11) which realizes at least a part of a rotor laminated body (1), wherein ring arrangements (20) are arranged in the stack (10, 11) in such a way that they are offset from axially adjacent ring arrangements (20) along the circumferential direction, so that the ring segments (30) of respectively adjacent ring arrangements (20) each have an axial overlap region (32) in common angular regions, wherein Partial through-openings (33) of ring segments (30) arranged axially one behind the other form at least one common through-opening (40) in overlapping regions (32), and material is poured into through-openings (40) in order to form cast material strands (41) there.

10. An electric rotary machine comprising a rotor according to any one of claims 1-8 or a rotor manufactured according to the method for manufacturing a rotor according to claim 9.

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