Laminated ring for laminated rotor core of electric machine and method for manufacturing the laminated rotor core

Abstract

The invention relates to a laminated ring (10) for constructing a laminated rotor core (1) of a rotor for an electric machine and a method for producing a laminated rotor core (1) for a rotor made of a plurality of laminated rings (10). The laminated ring (10) has a plurality of receiving openings (20) for permanent magnets and a plurality of structural elements (22) which are arranged uniformly in the laminated ring (10) at the same distance from one another in a circumferential direction (U) rotated by an offset angle (40) relative to an axis of symmetry (S1) so that the arrangement of the structural elements (22) is asymmetrical relative to the axis of symmetry (S1) of the laminated ring (10).

Description

Technical Field

[0001] The invention relates to a lamination ring of a lamination rotor core of a rotor for an electric machine. The lamination rotor core is made of a plurality of stacked lamination rings.

[0002] The invention also relates to a method for producing a laminated rotor core made of a plurality of laminated rings for a rotor of a permanently excited electric machine. Background Art

[0003] Published German patent application DE 10 2009 052 596 A1 discloses a rotor for an electric machine, which is formed by individual segments. Each individual segment has a first part, which is connected to a second corresponding part of an adjacent individual segment in a form-fitting manner in the assembled state, so that a self-supporting ring structure of the assembled rotor is formed in the circumferential direction. Each individual segment has an opening for a permanent magnet.

[0004] Published German patent application DE 10 2010 005 490 A1 discloses a rotor for an electric machine having individual segments and a rotor carrier. The individual segments are connected to the rotor carrier in a form-fitting manner.

[0005] The published German patent application DE 10 2011 018 619 A1 relates to a laminated core arrangement for a rotor of a permanent magnet excited synchronous machine for an electrical machine, in particular a vehicle, having a plurality of laminated core layers stacked on top of each other. Each laminated core layer comprises at least two laminated core parts in the shape of an annular segment, which are each connected to each other in the circumferential direction via one end face by means of a connecting arrangement. The individual laminated core layers of the laminated core arrangement can be connected by riveting or screwing.

[0006] Published German patent application DE 10 2011 115 159 A1 discloses a ring element for an electric motor. A first ring segment and at least one second ring segment are connected to each other to hold at least one magnet of the motor. The ring segments are connected to each other by means of the magnets. In addition, connecting elements that interact in a form-fitting manner can be formed at the joints of adjacent ring segments.

[0007] Published German patent application DE 10 2012 019 182 A1 relates to a connection arrangement for an electric machine, wherein at least one first ring segment of a ring element is attached to at least one second ring segment. In the axial direction, the ring segments are fixed to each other by at least one plastic deformation of the ring segments of the ring element.

[0008] European patent EP 2 466 732 B1 discloses a method for manufacturing a laminated rotor body. The strip-shaped core laminations have a plurality of pole segments protruding radially outward. The strip-shaped core laminations are stacked one on top of the other so that the pole segments are aligned with each other.

[0009] Published German patent application DE 10 2017 2014 38 discloses a laminated core disc for a rotor of an electric machine. The laminated core disc comprises a plurality of laminated core disc segments, wherein each laminated core disc segment has a connecting element at a first distal end and a mating connecting element at a second distal end opposite to the first distal end, the mating connecting element being used for form-fitting connection with a connecting element of another laminated disc segment to produce a laminated core disc. Magnet receiving recesses for forming magnet receiving recesses for receiving magnets are formed on end faces of both distal ends of each laminated core disc segment. Summary of the invention

[0010] The object of the present invention is to create a laminated ring for constructing a laminated rotor core for a rotor of an electric machine, with which vibrations and noises which may occur in the rotor of the electric machine can be reduced or avoided and a smoother operation can be achieved.

[0011] This object is achieved by a laminated ring for a laminated rotor core of a rotor of an electric machine, the ring comprising the features of claim 1 .

[0012] Another object of the invention is to create a method for producing a laminated rotor core of a rotor for a permanently excited electric machine made of a plurality of laminated rings, so that vibrations and noise that may occur in the electric machine can be reduced or avoided and smoother operation can be achieved.

[0013] This object is achieved by a method for producing a laminated rotor core for a rotor of a permanently excited electric machine, the method comprising the features of claim 7 .

[0014] A possible embodiment of a lamination ring for constructing a laminated rotor core for a rotor for an electric machine, wherein the rotor is made of a large number of stacked lamination rings, is characterized in that a plurality of receiving openings for permanent magnets are formed in pairs in the circumferential direction and in a V-shaped shape relative to each other in the lamination ring. In addition, the receiving openings for the permanent magnets are designed symmetrically with respect to the symmetry axis of the lamination ring. In addition, several structural elements are designed to be uniform and are located at the same distance from each other in the circumferential direction in the lamination ring, and the several structural elements are rotated by a certain angle relative to the symmetry axis of the lamination ring. As a result, the arrangement of the structural elements is asymmetrical with respect to the symmetry axis of the lamination ring.

[0015] The advantage of the above configuration of the lamination rings is that by assembling the lamination rings or lamination ring groups to form the laminated rotor core, the structural elements of the first two lamination rings or lamination ring groups are formed offset. The upper lamination ring or lamination ring group is rotated 180° about the axis of symmetry and installed to form the laminated rotor core. The definition of a lamination ring group is that two or more individual lamination rings are stacked in the same orientation in the axial direction. The channels (holes) for the fixing means are aligned in the axial direction within the group.

[0016] According to a possible embodiment of the invention, the lamination ring may comprise a plurality of identical annular segments. Each of the identical annular segments has receiving openings arranged in pairs and in a V-shape relative to each other. At least two structural elements are formed such that each of the structural elements is displaced by a certain angle in the circumferential direction relative to the axis of symmetry of the receiving opening for the permanent magnet.

[0017] The advantage of forming the lamination ring from a plurality of identical annular segments is that the fixing means can pass through the structural elements of the laminated rotor core in order to fasten the laminated rotor core to the retaining ring (etc.). Fixing means such as screws or rivets are preferred. Due to the annular segments forming the lamination ring, a significantly higher utilization of the stamped metal sheets can be achieved. All segments can be manufactured from stamped parts of identical geometry. Each of the segments can be installed in any position in the laminated rotor core. This simplifies handling and logistics.

[0018] Each of the annular segments that can be used to produce a laminated ring has, in the circumferential direction, a first end face with a connection system and a second end face with a complementary connection system.

[0019] According to an advantageous embodiment, a first connection element, a second connection element and a third connection element of different shapes are formed on the first connection system. A first complementary connection element, a second complementary connection element and a third complementary connection element of different shapes are formed on the second connection system. In order to connect the individual segments to a closed annular ring, the first connection element interacts with the first complementary connection element of the subsequent annular segment, the second connection element interacts with the second complementary connection element of the subsequent annular segment, and the third connection element interacts with the third complementary connection element of the subsequent annular segment in a form-fitting manner.

[0020] According to an advantageous embodiment, two structural elements are formed on each of the ring segments.

[0021] According to one embodiment of the invention, the structural element is designed as a channel for receiving in each case one fixing device for assembling the laminated rotor core on the retaining disk.

[0022] According to another possible embodiment of the invention, the structural element has a form-fitting geometry in order to hold the lamination rings against each other or to fasten the first lamination ring of the laminated rotor core to the retaining disk. The structural element serves to connect the lamination ring or the lamination ring group to the rotor carrier. For example, the structural element can be designed as an inner diameter tooth, a form-fitting geometry, etc.

[0023] In a possible embodiment in which the structural element is designed as a channel or a hole, the channels of the stacked lamination rings or stacked lamination ring groups are arranged at a predetermined offset angle. Despite the offset angle, the fixing device can still be operated in each of the channels of the laminated rotor core. The fixing device (screw connection or rivet connection) fixes the spatial position of the laminated rotor core in the rotor.

[0024] According to a preferred embodiment of the preferred embodiments of the present invention, the lamination ring is made of a plurality of identical annular segments. By using fixings by means of screws or rivets, a full ring (continuous lamination ring) can be omitted. The segmentation of the laminated rotor core (rotor stack) in combination with the above-mentioned screw connection or riveting provides the greatest advantage. The screws or rivets are evenly distributed radially in the annular segments. In addition, the annular segments ensure a significantly higher utilization of the metal sheets from which the individual segments are stamped. Since all segments include stamped parts of identical geometry, the segments can be installed in any position in the rotor as required, which simplifies handling and logistics. By preferably using segments of identical geometry, manufacturing costs can be kept to a minimum.

[0025] The offset angle is understood to mean the rotation of the mounting position of an individual laminated ring or a stack of identical laminated rings rotated about an axis of symmetry relative to another laminated ring or another stack of identical laminated rings. The offset angle has a positive effect on possible vibrations and noise and enables the motor to run more smoothly.

[0026] A simple method is to move the conventional passages (holes) for the screws / rivets on the hole circle of the lamination ring or annular segment by half the offset. The second (subsequent) lamination ring or second (subsequent) lamination ring group is installed in the opposite position so that the angular displacements are added.

[0027] According to a possible embodiment, this angular displacement in the lamination ring or the ring segment can be 0.4°. The first lamination ring or the first lamination ring group is arranged in a defined position with its underside for screw connection on the screw connection surface.

[0028] Then, the second (subsequent) lamination ring or second lamination ring group is positioned on the upper side of the first (bottom) lamination ring or first lamination ring group so that the two upper sides are superimposed on each other and the structural elements (channels, holes) are aligned with each other. With this method, the holes are shifted to the right by 0.4° relative to the average position of the holes, while the holes of the second lamination ring or second lamination ring group are shifted to the left by 0.4°. This results in a shift of 0.8°.

[0029] According to a possible embodiment of the present invention, lamination rings including annular segments are stacked individually or in groups such that joints of the lamination rings are aligned along the axial direction of the laminated rotor core.

[0030] According to another possible embodiment of the present invention, the laminated rings including the annular segments are stacked such that the joints of all the laminated rings are offset from each other by half the angle of the annular segments.

[0031] According to yet another embodiment of the present invention, the lamination rings including the annular segments are stacked in groups. In each group, the lamination rings including the annular segments are arranged so that the joints between the lamination rings are aligned along the axial direction of the laminated rotor core. The groups are arranged in the laminated core stack so that the joints along the axial direction of the consecutive groups are offset from each other by half the angular amount of the annular segments.

[0032] When stacking lamination rings from individual annular segments, as described above, there are various possible concepts (end to end, or alternating segments), for example. The connection of the individual segments to the lamination rings can be carried out, for example, in a form-fitting manner. The position of the individual segment levels can be changed after each individual laminate core layer in order to distribute the joints in the best possible way, which requires a high level of processing work. An alternative embodiment is to stack a certain number of segmented lamination rings into a group. The resulting segmented lamination ring group (multiple individual lamination rings) can be rotated relative to the subsequent group. The joint does not rotate within the individual lamination rings of the group, but a good compromise is formed between processing and minimizing losses.

[0033] According to the method of the invention for producing a laminated rotor core of a rotor for a permanently excited electric machine made of a plurality of laminated rings, the following method steps may be provided:

[0034] a) forming a plurality of identical laminated rings, wherein each laminated ring has a plurality of receiving openings for permanent magnets, the plurality of receiving openings being arranged in pairs symmetrically in the circumferential direction with respect to the symmetry axis of the laminated ring and being distributed in a V-shape relative to one another, and wherein a plurality of structural elements are uniformly formed in the laminated ring in the circumferential direction at the same distance from one another in a manner rotated by an offset angle relative to the symmetry axis, so that the arrangement of the structural elements is asymmetrical with respect to the symmetry axis of the laminated ring;

[0035] b) rotating the lamination ring or the lamination ring group by 180° around the axis of symmetry;

[0036] c) placing the rotated laminated ring or the rotated laminated ring group as a subsequent laminated ring or a subsequent laminated ring group on a previous non-rotated laminated ring or a previous non-rotated laminated ring group;

[0037] d) placing a non-rotated lamination ring or a non-rotated lamination ring group on a previous lamination ring;

[0038] e) Steps b to d are performed until the laminated rotor core is completed and fixed to the holding disk by one fixing device for each structural element.

[0039] According to a preferred embodiment of the method according to the invention, the individual laminated rings or laminated ring packages are stacked such that the structural elements of the laminated rings or laminated ring packages of two consecutive laminated rings or laminated ring packages are offset in the circumferential direction relative to one another by an offset angle.

[0040] According to a preferred embodiment, the laminated ring can be composed of a plurality of annular and identical segments punched from a metal sheet. Then, each of the annular segments has a connection system on a first end face and a complementary connection system on a second end face in the circumferential direction. In addition, each of the annular segments then has a plurality of receiving openings for permanent magnets arranged in pairs and in a V-shape relative to each other and at least two structural elements. The at least two structural elements are formed so that each structural element is displaced by half of the offset angle in the circumferential direction relative to the axis of symmetry of the receiving opening for the permanent magnet.

[0041] The laminated ring can be formed from a defined number of multiple annular and identical segments, so that a connection system of a first end face of an annular segment interacts with a complementary connection system on a second end face of a subsequent annular segment in a form-fitting manner. Multiple annular and identical segments for a laminated ring can be connected, for example, by clamping the segments.

[0042] The method according to the invention has the advantage that a completely cylindrical rotor carrier is not necessary when fixing (screwing or riveting) the laminated rotor core. It is sufficient if the laminated rotor core has only one centering seat. The centering can also be completely performed during the assembly of the laminated rotor core using suitable tools.

[0043] Another embodiment could be to completely omit the rotor carrier as a tubular carrier element and to fasten the laminated rotor core to a retaining disk. Other parts of the hybrid module can also be attached to the retaining disk. The retaining disk can also be used as a pressure plate for the clutch. This increases the proportion of functional integration and the open radial installation space can be used to increase the torque of the electric motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] With reference to the accompanying drawings, the invention and its advantages will now be explained in more detail by means of exemplary embodiments, without thereby limiting the invention to the exemplary embodiments shown. The scales in the figures do not always correspond to the true scale, since for a better illustration some shapes are simplified and other shapes are shown enlarged relative to other elements.

[0045] FIG. 1 shows a plan view of a metal sheet from which a lamination ring for a laminated rotor core according to the background of the art is punched.

[0046] Figure 2 A schematic plan view of a lamination ring formed from a plurality of annular segments is shown.

[0047] Figure 3 A schematic plan view of a metal sheet is shown; Figure 3 The annular segments of the laminated ring are punched out of the metal sheet.

[0048] Figure 4 A plan view of a lamination ring is shown, which is formed from a plurality of annular segments according to the invention.

[0049] Figure 5 A plan view of a ring segment according to the invention is shown.

[0050] Figure 6 A cross-sectional view of an installed laminated rotor core is shown.

[0051] Figure 7 The formation of channels (holes) to form the offset angles is shown in a plan view of one of the ring segments.

[0052] Figure 8 A schematic diagram of two layers of stacked lamination rings or a lamination ring package is shown without displacement of the structural elements (channels).

[0053] Fig. 9 A schematic representation of two layers of a stacked lamination ring or lamination ring package is shown with the structural element (channel) displaced to the right by half the offset angle.

[0054] Fig.10 A schematic diagram of two layers of a stacked lamination ring or lamination ring package is shown with the structural elements (channels) displaced by the entire offset angle.

[0055] Fig.11 A schematic side view is shown without displacement of the structural element (internal toothing).

[0056] Fig.12 A schematic side view is shown with the structural element (internal toothing) displaced to the right by half the offset angle.

[0057] Fig.13 A schematic side view of a structural element (internal toothing) displaced by an offset angle is shown, wherein the top laminated ring or the top laminated ring package is rotated by 180°.

[0058] The same reference numerals are used for the same or equivalent elements in the present invention. In addition, for the sake of clarity, only the reference numerals necessary for the description of the corresponding figures are shown in each figure. The accompanying drawings represent only exemplary embodiments of the present invention, but do not limit the present invention to the exemplary embodiments shown. DETAILED DESCRIPTION

[0059] 1 shows a plan view of a metal sheet 9 from which lamination rings 10 are punched according to the background of the art to remove a laminated rotor core 1. Due to assembly conditions, such as cross interference, screw connections, riveting, etc., the lamination rings 10 of the laminated rotor core 1 are designed as full rings. However, this means that there is an extremely high stamping waste in the manufacturing process of these full rings (individual cores).

[0060] Figure 2 A schematic plan view of a lamination ring 10 formed from a plurality of annular ring segments 12 is shown. Figure 3 A schematic plan view of a metal sheet 9 is shown, which is used for Figure 3 The annular segment 12 of the laminated ring 10 is punched out from the metal sheet. All the punched out annular segment 12 are identical. The laminated ring 10 is produced from the annular segment 12. The arrangement of the annular segment 12 enables significantly higher utilization of the metal sheet 9. For example, a punching tool (not shown) with multiple nested parts can be used, or the metal sheet 9 can be moved under the punching tool. All the annular segments 12 are designed to be identical in geometry.

[0061] Figure 4A plan view of two lamination rings 10 arranged one above the other is shown, both of which are formed by a plurality of annular segments 12 according to a possible embodiment of the present invention. The plan view shows two segment levels. The annular ring segments 12 of the upper lamination ring 10 are identified by dashed lines. The annular segments 12 of the lower lamination ring 10 are identified by dot-dash lines. Structural elements 22 for fixing devices (not shown here) and receiving openings 20 for permanent magnets arranged in pairs are distributed on each of the lamination rings 10 in a rotationally symmetrical manner. In the embodiment of the annular segments 12 shown here, the structural elements 22 are designed as channels or holes, which cannot be understood as a limitation of the present invention. In the embodiment shown here, each of the lamination rings 10 includes five annular segments 12. The upper lamination ring 10 is rotated relative to the lower lamination ring 10 by half the angular range (arc length B) of the annular segment 12.

[0062] from Figure 4 It can be clearly seen in FIG. 1 that, despite the rotation, the structural elements 22 of the two stacked lamination rings 10 including the annular segments 12 are aligned. The receiving openings 20 for permanent magnets (not shown here) arranged in pairs are also aligned. By rotating the upper lamination ring 10 relative to the lower lamination ring 10, the joint 25 between the annular segments 12 of the upper lamination ring 10 and the annular segments 12 of the lower lamination ring 10 also rotates accordingly. The lamination ring 10 is axially symmetrical with respect to the symmetry axis S1.

[0063] Figure 5 A plan view of a possible embodiment of an annular segment 12 according to the invention is shown. Each annular segment 12 has a first end face 14 with a connection system 4 in the circumferential direction U. The annular segment 12 also has a second end face 16. The first end face 14 has a connection system 4 formed during the stamping process. The second end face 16 has a connection system 6 that is complementary to the connection system 4 and is also formed during the stamping process.

[0064] In the embodiment shown here, which should not be understood as limiting the present invention, the first connection system 4 includes a first connection element 51, a second connection element 52 and a third connection element 53 that are different in shape. The second connection system 6 includes a first complementary connection element 71, a second complementary connection element 72 and a third complementary connection element 73 that are also different in shape. The first connection element 51 interacts with the first complementary connection element 71 of the subsequent annular segment 12 in a form-fitting manner. The second connection element 52 interacts with the second complementary connection element 72 of the subsequent annular segment 12 in a form-fitting manner. The third connection element 53 interacts with the third complementary connection element 73 of the subsequent annular segment 12 in a form-fitting manner.

[0065] Each of the annular segments 12 has a punched-out receiving opening 20 for a permanent magnet, which are all arranged in an axially symmetrical manner with respect to the symmetry axis S2 of the annular segment 12. Figure 7 ), so the plurality of structural elements 22 are not arranged in an axially symmetrical manner around the symmetry axis S2 of the annular segment 12. In addition, the receiving openings 20 for the permanent magnets and the plurality of structural elements 22 are arranged uniformly along the arc length B of the annular segment 12.

[0066] Figure 6 A cross-sectional view of an assembled laminated rotor core 1 is shown. In the embodiment shown here, the rotor carrier as a tubular carrier element can be completely omitted and the laminated rotor core 1 is fastened to the retaining disk 11. The fixing means 23 are designed as screws. The screws extend in the structural element 22 of the stacked lamination ring 10 or the stacked lamination ring 10 group and interact with the retaining disk 11 to fix the laminated rotor core 1.

[0067] Figure 7 A plan view of one of the annular segments 12 is shown, wherein the formation of the structural element 22, such as, for example, a channel or a hole, is offset by an offset angle 40. The solid line 42 marks the center between the receiving openings 20 for the permanent magnets. The dashed line 44 marks the center of the structural element 22. In the embodiment shown here, the annular segment 12 has two structural elements 22, which are arranged uniformly and at the same distance from each other in the circumferential direction U. The structural elements 22 are arranged at an angle 40 relative to the center line 42 of the receiving opening 20 for the permanent magnet. The deviation of the angle 40 of rotation of the structural element 22 of the annular segment 12 relative to the cross 44 marking the center of the structural element 22 and the center line 42 of the receiving opening 20 for the permanent magnet is clear. The angle 40 of rotation is defined as half of the offset angle.

[0068] Figure 8 A schematic diagram of a first lowermost layer 17 and a second uppermost layer 18 of a stacked lamination ring 10 or a group of lamination rings 10 comprising annular segments 12 is shown. Here, the structural element 22 of the annular segment 12 (channel) is not displaced relative to the center line (here represented by a solid line 42) of the receiving opening 20 (not shown here) for the permanent magnet. The angle 40 is equal to zero and the solid line 42 coincides with the dashed line 44 marking the center of the structural element 22.

[0069] Fig. 9A schematic diagram of two layers 17 and 18 of a stacked lamination ring 10 or a set of lamination rings 10 is shown, wherein the structural element 22 (channel) is displaced to the right by half an angle 40. The displacement of the structural element 22 (channel) of the ring segment 12 relative to the center line of the receiving opening 20 for the permanent magnet, represented here by the solid line 42, is illustrated by the fact that the solid line 42 does not coincide with the dashed line 44 marking the center of the structural element 22.

[0070] Fig.10 A schematic diagram of two layers 17 and 18 of a stacked lamination ring 10 or a set of lamination rings 10 is shown, wherein the structural element 22 (channel) is displaced by an angle 40 (offset angle). The displacement or rotation angle 40 is achieved by displacing the top lamination ring 10 (top layer 18) or the upper side 26 18 The top stack ring 10 (top layer 18) is placed on the top side 26 of the lower stack ring 10 (lowest layer 17). 17 Or the lower lamination ring 10 group (lowest layer 17) is achieved. This is achieved by the top lamination ring 10 (top layer 18) or the top lamination ring 10 group (top layer 18) around the symmetry axis S1 (see Figure 4 ) is achieved by rotating 180°.

[0071] Fig.11 A schematic side view is shown, wherein a structural element 22 of a laminated ring 10 (not shown) or an annular segment 12 of a laminated ring 10 (not shown) is not displaced, the structural element being formed as an inner toothing 22 IN . Therefore, the angle 40 is zero.

[0072] Fig.12 The structural element (internal tooth portion) 22 is shown INV Schematic side view of a shift to the right by half an angle 40 (offset angle). The angle 40 is formed by the unshifted inner toothing 22 IN With the displaced inner tooth portion 22 INV The comparison between the two is generated. Fig. 9 This occurs in a similar manner to the one already explained in the description.

[0073] Fig.13 The structural element (internal tooth portion) 22 is shown INV Schematic side view displaced by an angle of 40 (full offset angle). Fig.10 As described above, the uppermost lamination ring 10 or the uppermost lamination ring 10 group is rotated by 180°. The result is an angle of 40° (full offset angle), which is formed by the non-displaced inner toothing 22 of the two lamination rings 10 or the two lamination rings 10 groups. IN With the displaced inner tooth portion 22 INV Comparison between them is generated.

[0074] It is believed that the present disclosure and the many advantages pointed out in the present disclosure will be understood from the foregoing description. Obviously, various modifications can be made to the shape, structure and arrangement of the components without departing from the disclosed subject matter. The described forms are merely illustrative and the intention of the appended claims is to include and incorporate such modifications. Therefore, the scope of the present invention should be limited only by the appended claims.

[0075] Reference numerals list

[0076] 1 laminated rotor core 4 connection system 51 first connection element 52 second connection element 53 third connection element 6 complementary connection system 71 first complementary connection element 72 second complementary connection element 73 third complementary connection element 9 metal sheet 10 laminated ring 11 retaining disk 12 ring segment 14 first end face 16 second end face 17 first or lowermost layer 18 second or uppermost layer 20 receiving opening for permanent magnet 22 structural element 22 IN Internal tooth portion 22 INV Displaced internal toothed portion 23 fixing device 25 engagement portion 26 17 Top side 26 18 The top side 40 is offset by an angle; angle 42, solid line 44, dashed line cross, dashed line B, arc length S1, symmetry axis S2, symmetry axis U of the lamination ring, circumferential direction.

Claims

1. A method for producing a laminated rotor core (1) for a rotor of a permanently excited electric machine made of a plurality of laminated rings (10), the method comprising the following steps: a) forming a plurality of identical laminated rings (10), in, Each lamination ring (10) has a plurality of receiving openings (20) for permanent magnets, the plurality of receiving openings are arranged in pairs symmetrically along a circumferential direction (U) relative to an axis of symmetry (S1) of the lamination ring (10) and are distributed in a V-shape relative to each other, and a plurality of structural elements (22) are uniformly formed in the lamination ring (10) along the circumferential direction (U) at the same distance from each other, the plurality of structural elements are rotated by an offset angle (40) relative to the axis of symmetry (S1), so that the arrangement of the structural elements (22) is asymmetrical relative to the axis of symmetry (S) of the lamination ring (10); b) rotating the lamination ring (10) or the lamination ring (10) group by 180° around the symmetry axis (S); c) placing the rotated laminated ring (10) or the rotated laminated ring (10) group as a subsequent laminated ring (10) or a subsequent laminated ring (10) group on a previous, non-rotated laminated ring (10) or a previous, non-rotated laminated ring (10) group; d) placing a non-rotated lamination ring (10) or a group of non-rotated lamination rings (10) onto a previous lamination ring (10); e) Steps b to d are performed until the laminated rotor core (1) is completed and the laminated rotor core (1) is fixed to the retaining disk (11) by one fixing device (23) for each structural element (22).

2. The method according to claim 1, in, Individual lamination rings (10) or lamination ring (10) groups are stacked such that the structural elements (22) of the lamination rings (10) or lamination ring (10) groups of two consecutive lamination rings (10) or lamination ring (10) groups are offset from each other by an offset angle (40) in the circumferential direction.

3. The method according to claim 1 or 2, in, A plurality of identical annular segments (12) are stamped from a metal sheet (9) so that in the circumferential direction (U), a connection system (4) on a first end face (14), a complementary connection system (6) on a second end face (16), a plurality of receiving openings (20) for permanent magnets arranged in pairs and in a V-shape relative to each other, and at least two structural elements (22) are formed on each of the annular segments (12); wherein the at least two structural elements (22) are formed so that each structural element (22) is displaced in the circumferential direction (U) by half an offset angle (40) relative to an axis of symmetry (S2) of the receiving openings (20) for the permanent magnets.

4. The method according to claim 3, in, The laminated ring (10) is formed by a defined number of annular and identical segments (12), so that the connection system (4) of the first end face (14) of the annular segment (12) interacts in a form-fitting manner with the complementary connection system (4) on the second end face (16) of the subsequent annular segment (12).

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