Rotor, manufacturing arrangement for the production of a rotor, method for the production of a rotor and electrical machine

Abstract

Rotor (1) for an electric machine (2), in particular for use within a powertrain (3) of a hybrid or fully electric motor vehicle (4), wherein the rotor (1) is formed from a plurality of rotor bodies (6) constructed from stacked rotor laminations (5), and the rotor bodies (6) are equipped with permanent magnets (8), wherein the rotor bodies (6) are rotated relative to each other about a common axis of rotation (7), wherein the rotor (1) thereby has a twist angle α defined by the total rotation of the rotor bodies (6), characterized by the fact that the rotor laminations (5) each have at least one first articulation hole (9) which can be axially penetrated by a first rod-like tool (13), by means of which the relative articulation of two axially adjacent rotor bodies (6) can be adjusted, and the first articulation holes (9) in the rotor (1) are arranged in alignment with each other, so that a first channel (10) extending axially through the rotor (1) is formed, wherein the first interlocking holes (9) have a contour (11) that deviates from the circular shape and has a longitudinal extent (12) in the radial direction.

Description

[0001] The present invention relates to a rotor for an electric machine, in particular for use within a drive train of a hybrid- or fully electric-powered motor vehicle, wherein the rotor is formed from a plurality of rotor bodies constructed from stacked rotor laminations, and the rotor bodies are equipped with permanent magnets, wherein the rotor bodies are rotated relative to one another about a common axis of rotation, wherein the rotor thereby has an angle of twist α defined by the total rotation of the rotor bodies. The invention further relates to a manufacturing arrangement for producing a rotor, a method for producing a rotor, and an electric machine.

[0002] Electric motors are increasingly being used to power motor vehicles, creating alternatives to combustion engines that require fossil fuels. Considerable efforts have already been made to improve the everyday suitability of electric drives and also to provide users with the same level of driving comfort they are accustomed to.

[0003] Permanent-magnet synchronous motors (PMOs) are already used in many industrial applications and, with the advent of electrification, are increasingly being used in the automotive industry. Such a PMO typically comprises a stator to be energized and a permanently excited rotor. Permanent-magnet synchronous motors are constructed as both internal rotor and external rotor motors (with the stator positioned internally). To achieve the best possible synchronization characteristics, the stator's electrical windings are divided into numerous winding sections, which are arranged circumferentially in succession according to the current phases used. Modern synchronous motors are often operated in a three-phase electrical system, which can deliver high torques. In this case, the number of electrical sub-windings is a whole multiple of three.The number of magnetic poles on the rotor is matched to the winding arrangement of the electrical coils on the stator. The ratio between the number of poles on the rotor and the number of electrical poles on the stator also influences the motor's synchronous running characteristics. Two adjacent poles on the rotor each form a so-called pole pair.

[0004] Due to the magnetic forces acting on a permanent magnet synchronous motor, a noticeable cogging occurs when the rotor is manually rotated in a de-energized state. More problematic for the running characteristics of such a synchronous motor, however, is a similar effect that occurs when the motor is energized and under load and is referred to in this context as load pulsation, torque fluctuation or ripple torque. When the number of poles is sufficiently high, load pulsation is barely noticeable when the motor is idling (when no or only a small amount of torque is being drawn). However, if the motor is operated with a high torque take-off, the load pulsation is clearly noticeable as a periodic torque fluctuation. The torque fluctuation usually follows a sine wave, which corresponds to a higher harmonic of the torque change occurring at a pole pair.

[0005] Since such load pulsation is disruptive in many applications, particularly when high synchronous running characteristics are required, there are various approaches in the state of the art to reduce load pulsation. For example, attempts are made to counteract load pulsation by varying the current values ​​fed into the motor in opposite directions. Such electronic control can lead to a reduction in load pulsation in relatively slow-running motors with constant load reduction and very fast-acting control circuits. However, if the motor control system must compensate for rapidly changing load conditions at high speeds, conventional control circuits are no longer capable of simultaneously regulating the load pulsation at a reasonable cost.

[0006] Another solution pursued in practical implementations is to reduce load pulsation by angling the rotor poles relative to the stator poles. In permanent-magnet synchronous motors, the permanent magnets arranged on the rotor are tilted relative to the rotational axis. This angular position ensures that the entire cross-sectional area of ​​the poles never faces each other, which, on the one hand, reduces the maximum torque but, on the other, also has a leveling effect on load pulsation.

[0007] Rotors for electrical machines that exhibit such reduced torque ripple are known from the state of the art. For example, various concepts for a rotor with reduced torque ripple are proposed on the website https: / / etn-demeter.eu / rotor-shapingtechnologies-for-permanent-magnet-electrical-machines / .

[0008] A concept known from the state of the art as rotor skew for reducing torque ripple is that a rotor with a plurality of rotor segments arranged axially next to one another and rotated relative to one another by an angle can each be rotated relative to one another by a certain angle.

[0009] Various rotor skews are known. In a linear skew, the skew of the magnetic poles of the same polarity runs linearly from a first rotor segment in the axial direction to a last rotor segment. V-shaped rotor skews are also known, in which the path of the magnetic poles resembles a V shape.

[0010] The rotors of electric motors are often assembled using rotor laminations or rotor lamination stacks. As already explained above, a defined interlacing or relative angular position of the rotor laminations or rotor lamination stacks to one another is of paramount importance for the correct functioning of the electric motor and the harmonious synchronization of the electric machine. Therefore, this interlacing must be reliably and correctly adjusted during rotor assembly, and the rotor laminations or rotor lamination stacks must be joined to the rotor shaft with this specified interlacing. Furthermore, it must be ensured that the interlacing, once correctly adjusted, is also maintained during operation of the electric motor.

[0011] From DE 10 2018 112 195 A1, it is known that, for anchoring purposes, the rotor laminations, preferably all rotor laminations, have cup-shaped or hat-shaped apertures that have recesses on one side of the rotor lamination and raised portions on the other side of the rotor lamination, whose dimensions are coordinated for attachment to one another. This means that the presence of the recesses or raised portions on the respective sides of the rotor laminations simplifies the implementation of the interlocking of the individual rotor laminations / rotor lamination stacks.

[0012] The use of so-called guide rods for stacking rotor laminations without interlacing is known, for example, from DD 1 47 296 A, WO 02 / 097 952 A1, DE 10 2017 103 261 A1, the use of guide rods for stacking with interlacing is known, for example, from DE 27 49 124 A1, JP S60- 139 150 A, JP S57- 129 152 A, JP S60- 216 744 A, DE 85 23 309 U1. Also known is the use of arc-shaped elongated holes arranged in the circumferential direction for the section-by-section, beveled stacking of rotor laminations with tension rods, see, for example, DE 10 2018 205 313 ​​B3, DE 10 2015 012 912 A1, JP 2004- 248 442 A, US 10 998 783 B2.

[0013] There is a continuing need to reduce the torque ripple of rotors by means of rotor skew.

[0014] However, common methods for joining laminated cores typically involve heating them, for example, during plastic injection molding processes, causing them to expand due to thermal expansion. This can lead to the required tolerances for the rotation of the individual rotor cores relative to each other not being met.

[0015] The invention is therefore based on the object of providing a rotor in which the torque ripple can be reduced, thus increasing the smoothness and service life of the rotor. It is also the object of the invention to realize a rotor that can be manufactured cost-effectively and which can ensure the highest possible accuracy in the rotation of the individual rotor laminations relative to one another. Furthermore, the object of the invention is to realize an improved production arrangement for producing a rotor and an optimized method for producing a rotor. It is also the object of the invention to provide an electrical machine with high smoothness and cost-effective production.

[0016] This object is achieved by a rotor for an electric machine, in particular for use within a drive train of a hybrid or fully electric motor vehicle, wherein the rotor is formed from a plurality of rotor bodies constructed from stacked rotor laminations, and the rotor bodies are equipped with permanent magnets, wherein the rotor bodies are rotated relative to one another about a common axis of rotation, wherein the rotor thereby has an interlacing angle α defined by the entire rotation of the rotor bodies, wherein the rotor laminations each have at least one first interlacing hole through which a first rod-like tool can axially penetrate, by means of which the relative interlacing of two axially adjacent rotor bodies can be adjusted, and the first interlacing holes in the rotor are arranged in alignment with one another, so that a first channel extending axially through the rotor is formed,wherein the first interlacing holes have a contour deviating from the circular shape, which has a longitudinal extension in the radial direction.,

[0017] This provides the advantage that the rotor laminations can be positioned with sufficient precision in the circumferential direction to maintain the required torsional tolerances between the laminations. Furthermore, the laminations can be easily joined, and the different linear expansions at different temperatures of the laminations and the tool can be compensated. The rotors according to the invention thus have an interlacing hole pattern in the rotor laminations, which allows the interlacing of the rotor bodies to be defined very precisely.

[0018] First, the individual elements of the claimed subject matter of the invention are explained in the order of their relevance or their mention in the set of claims, and particularly preferred embodiments of the subject matter of the invention are described below.

[0019] A rotor is the rotating part of an electrical machine. The rotor comprises, in particular, a rotor shaft and one or more rotor bodies formed from rotor cores, arranged in a rotationally fixed manner on the rotor shaft. The rotor shaft can be hollow, which not only reduces weight but also allows the supply of lubricant or coolant to the rotor body.

[0020] For the purposes of the invention, a rotor body is understood to mean the rotor without the rotor shaft. The rotor body is therefore composed, in particular, of a rotor core and the permanent magnets incorporated into the pockets of the rotor core or fixed circumferentially to the rotor core, as well as any axial cover parts for closing the pockets.

[0021] The permanent magnets can preferably be incorporated into the pockets of the rotor core. A single larger rotor magnet designed as a bar magnet or several smaller permanent magnet elements can be provided per pocket.

[0022] The rotor has a plurality of rotor bodies. Particularly preferably, the rotor bodies are formed from substantially the same parts, in particular substantially identical. It is most preferred for the rotor bodies to be formed from substantially the same parts, in particular substantially identical rotor laminations. The rotor bodies are therefore particularly preferably formed from a rotor lamination stack, which is composed of a plurality of laminated individual laminations or rotor laminations, generally made of electrical steel sheet, which are layered and stacked one on top of the other to form a stack, the so-called rotor lamination stack. The individual laminations can be held together in the rotor lamination stack by gluing, welding, or screwing. A rotor lamination stack can, in particular, also have permanent magnets introduced into the pockets of the rotor lamination stack or fixed circumferentially to the rotor lamination stack.

[0023] The rotor according to the invention is intended for use in an electrical machine. This machine typically serves to convert electrical energy into mechanical energy and / or vice versa. Electrical machines typically comprise a stationary part, referred to as a stator, stand, or armature, and a part, referred to as a rotor or runner, which is arranged to be movable relative to the stationary part.

[0024] In the case of electrical machines designed as rotating machines, a distinction is made in particular between radial flux machines and axial flux machines. A radial flux machine is characterized in that the magnetic field lines in the air gap formed between the rotor and stator extend in the radial direction, whereas in the case of an axial flux machine the magnetic field lines in the air gap formed between the rotor and stator extend in the axial direction. In connection with the invention, the rotor according to the invention is preferably intended for use in a radial flux machine. The stator of a radial flux machine is usually cylindrical and generally consists of electrically insulated, layered and stacked laminations.Distributed around the circumference, grooves or circumferentially closed recesses are recessed into the electrical sheet, running parallel to the rotor shaft. These grooves accommodate the stator winding or parts of the stator winding. Depending on the design, the grooves can be closed with locking elements, such as locking wedges or covers, or the like, to prevent the stator winding from becoming detached.

[0025] The rotor according to the invention is intended in particular for use in an electric machine within a drive train of a hybrid or fully electric motor vehicle.

[0026] In particular, the electric machine is dimensioned such that vehicle speeds greater than 50 km / h, preferably greater than 80 km / h, and especially greater than 100 km / h can be achieved. The electric motor particularly preferably has an output greater than 30 kW, preferably greater than 50 kW, and especially greater than 70 kW. It is further preferred that the electric machine provides speeds greater than 5,000 rpm, particularly preferably greater than 10,000 rpm, and most preferably greater than 12,500 rpm.

[0027] For the purposes of this application, motor vehicles are defined as land vehicles that are propelled by mechanical power without being tied to railway tracks. A motor vehicle can, for example, be selected from the group of passenger cars (PCs), trucks (HGVs), mopeds, light motor vehicles, motorcycles, buses (KOMs), or tractors.

[0028] For the purposes of this application, the drive train of a motor vehicle is understood to mean all components in the motor vehicle that generate the power for driving the motor vehicle and transmit it to the road via the vehicle wheels.

[0029] According to a further preferred development of the invention, it can also be provided that the interlacing holes are arranged on a common pitch circle D1 positioned coaxially to the rotor.

[0030] Advantageous embodiments of the invention are specified in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technologically expedient manner and can define further embodiments of the invention. Furthermore, the features specified in the claims are further specified and explained in the description, where further preferred embodiments of the invention are presented.

[0031] According to an advantageous embodiment of the invention, it can be provided that the rotor laminations each have at least one second interlacing hole which can be axially penetrated by a second rod-like tool and by means of which the relative interlacing of two axially adjacent rotor bodies can be adjusted, and the second interlacing holes are arranged in the rotor in alignment with one another, so that a second channel extending axially through the rotor is formed, wherein the second interlacing holes have a contour which deviates from the circular shape and has a longitudinal extension in the radial direction.

[0032] The advantage of this design is that a geometrically unique arrangement of a rotor lamination can be defined by two interlacing holes.

[0033] Most preferably, the first and second interlacing holes are arranged offset by 180° from each other on a common pitch circle D1, which allows particularly good compensation of thermal expansions within the stator laminations.

[0034] According to a further preferred development of the invention, it can also be provided that the first interlacing holes and / or the second interlacing holes of the rotor laminations are designed to be substantially identical, which is particularly advantageous in terms of manufacturing technology.

[0035] Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the first interlacing holes and / or second interlacing holes are / are designed as elongated holes, wherein the elongated hole has a substantially rectangular section, to which a semicircular section adjoins on each side in the radial direction. This design has proven particularly advantageous for the production of interlaced rotors.

[0036] According to a further particularly preferred embodiment of the invention, it can be provided that the rectangular section has a length L in the radial direction and the semicircular sections each have a diameter DS, wherein the length L is between L=0.1 * DS and L=0.2 * DS.

[0037] This makes it possible, in particular, to maintain very precise tolerances in the circumferential direction, while providing sufficient space in the radial direction to compensate for thermal material expansion.

[0038] It is further preferred that the radial extent of the elongated hole is less than 0.1 * (D1 +DS), whereby a sufficiently good thermal expansion compensation can be provided.

[0039] The object of the invention can further be achieved by a manufacturing arrangement for producing a rotor according to one of claims 1-5, comprising a first rod-like tool, as well as a plurality of rotor bodies constructed from stacked rotor laminations, wherein the rotor bodies are equipped with permanent magnets and are rotated relative to one another about a common axis of rotation, whereby the rotor thereby has an interlacing angle α defined by the total rotation of the rotor bodies, whereby the rotor laminations each have at least one first interlacing hole through which the first rod-like tool can axially penetrate, by means of which the relative interlacing of two axially adjacent rotor bodies can be adjusted, and the first interlacing holes in the rotor are arranged in alignment with one another, so that a first channel extending axially through the rotor is formed, whereby the first interlacing holes have a contour deviating from the circular shape,which has a longitudinal extension in the radial direction, and the rod-like first tool, when inserted into the first interlocking holes, passes through the first interlocking holes with play in the radial direction and essentially without play in the circumferential direction.

[0040] The object of the invention can also be achieved by a method for producing a rotor comprising the following steps: • Provision of a first rod-like tool and • Providing a plurality of rotor bodies constructed from stacked rotor laminations, wherein the rotor bodies can be equipped with permanent magnets and are rotatable relative to one another about a common axis of rotation, wherein the rotor thereby has an interlacing angle α defined by the entire rotation of the rotor bodies, wherein the rotor laminations each have at least one first interlacing hole through which the first rod-like tool can axially penetrate, by means of which the relative interlacing of two axially adjacent rotor bodies can be adjusted, and the first interlacing holes in the rotor are arranged in alignment with one another, so that a first channel extending axially through the rotor is formed, wherein the first interlacing holes have a contour deviating from the circular shape, which has a longitudinal extension in the radial direction, • Push the rotor laminations through the first interlocking holes onto the rod-like first tool.

[0041] In this context, it may also be advantageous to further develop the process so that the rotor laminations are pushed on at a temperature of 15°C-35°C. Preferably, the first and second tools have a temperature of 50-100°C, preferably 65-85°C, when pushing on the rotor laminations. During molding, the rotor laminations and the tools are then preferably heated to a temperature between 150-200°C, preferably 160-180°C.

[0042] Finally, the object of the invention can also be achieved by an electric machine, in particular for use within a drive train of a hybrid or fully electric motor vehicle, comprising a rotor according to one of claims 1-5.

[0043] The invention will be explained in more detail below with reference to figures without limiting the general inventive concept.

[0044] It shows: Fig. 1 an electrical machine in a schematic axial sectional view, Fig. 2 a rotor lamination stack of a rotor in a frontal view, Fig. 3 a detailed view of an interlacing hole, Fig. 4 a manufacturing arrangement for a rotor in a perspective view, Fig. 5 a motor vehicle with an electric drive train in a schematic block diagram.

[0045] The Fig. 1 shows a rotor 1, which is mounted rotatably relative to the stator 23, for an electric machine 2 for use within a drive train 3 of a hybrid or fully electric motor vehicle 4, as is also shown by way of example in the Fig. 5. In the embodiment shown, the electrical machine 2 is designed as a radial flux machine.

[0046] The rotor 1 is formed from three rotor bodies 6a, 6b, 6c constructed from packaged rotor laminations 5 and the rotor bodies 6a, 6b, 6c are equipped with permanent magnets 8, which can be seen from the combination with the Fig. 2 becomes apparent.

[0047] The rotor bodies 6a, 6b, 6c are rotated relative to one another about a common axis of rotation 7, whereby the rotor 1 thereby has an angle of twist α defined by the total rotation of the rotor bodies 6.

[0048] As from the Fig. 2, the rotor laminations 5 each have a first interlacing hole 9 which can be axially penetrated by a first rod-like tool 13 and by means of which the relative interlacing of two axially adjacent rotor bodies 6 can be adjusted, and the first interlacing holes 9 in the rotor 1 are arranged in alignment with one another, so that a first channel 10 extending axially through the rotor 1 is formed, which can also be clearly seen from the synopsis of Fig. 2 with the Fig. 3 results.

[0049] The first interlacing holes 9 have a contour 11 that deviates from the circular shape and has a longitudinal extension 12 in the radial direction.

[0050] The rotor laminations 5 further each have at least one second interlacing hole 14, which can be axially penetrated by a second rod-like tool 21 and by means of which the relative interlacing of two axially adjacent rotor bodies 6 can be adjusted. The second interlacing holes 14 are arranged in alignment with one another in the rotor 1, so that a second channel 15 extending axially through the rotor 1 is formed. The second interlacing holes 14 also have a contour 16 that deviates from the circular shape and has a longitudinal extension 17 in the radial direction.

[0051] The first interlacing holes 9 and the second interlacing holes 14 of the rotor laminations 5 are essentially identical and are arranged on a common pitch circle D1 positioned coaxially to the rotor 1.

[0052] The rotor twisting of the individual rotor bodies 6a, 6b, 6c is thus achieved by the twisting holes 9, 14, which are arranged on a common pitch circle D1. These holes are inserted into the rotor bodies 6a, 6b, 6c at different angles (angle 1, angle 2) on the pitch circle D1, depending on the desired twisting angle of the rotor 1. Since only individual twisting holes are required to ensure the twisting of the stator bodies 6a, 6b, 6c, it is possible to design these as shown in Fig. 2, to be executed as elongated holes 18.

[0053] When designing the elongated holes 18, the width of the elongated hole 18 is designed with as little clearance as possible for a tool 13, 21. The tolerance here is determined by the expansion of the tool 13, 21 under temperature and the manufacturing tolerances. The tolerance is in the range of <2.5% of the diameter of the circular tool 13, 21. The radial length of the elongated hole 18 is determined by the different thermal expansion of the base plate 24 with the tools 13, 21 and the rotor laminations 5. A radial extension of the elongated hole less than 0.1 * (D1 + DS) has proven particularly advantageous.

[0054] The first interlocking holes 9 and second interlocking holes 14 are formed in the embodiment shown as an elongated hole 18, wherein the elongated hole 18 has a substantially rectangular section 19, to which a semicircular section 20 adjoins on both sides in the radial direction, as shown in the Fig. 3. The rectangular section 19 has a length L in the radial direction and the semicircular sections 20 each have a diameter DS, the length L being between L=0.1 * DS and L=0.2 * DS.

[0055] In the Fig. 4 is a manufacturing arrangement 22 for producing a rotor 1 as shown in the Fig. 1-3. The manufacturing arrangement 22 has a first rod-like tool 13 with a circular cross-section and a second rod-like tool 21 with a circular cross-section. In the embodiment shown, the first tool 13 and the second tool 21 are essentially identical. The diameter of the tools 13, 21 is selected such that the tools 13, 21 can penetrate the interlacing holes 9, 14. The tools 13, 21 extend orthogonally from the plane of a base plate 24 so that the rotor laminations 5 rest on this base plate 24 when they are placed over the tools 13, 21 by means of the interlacing holes 9, 14.

[0056] Using the manufacturing arrangement 22, a rotor 1 can be manufactured as follows: First, a first and second rod-like tool 13,21 is provided, as is also the case in the Fig. 4. Then, a plurality of rotor bodies 6 constructed from stacked rotor laminations 5 are provided, wherein the rotor bodies 6 can be equipped with permanent magnets 8 and can be rotated relative to one another about a common axis of rotation 7, wherein the rotor 1 thereby has an angle of twist α defined by the total rotation of the rotor bodies 6. The rotor laminations 5 correspond to those in the Fig. 2-3. These rotor laminations 5 are then pushed through the first interlocking holes 9, 14 onto the rod-like tools 13, 21.

[0057] The rotor laminations 5 are pushed on at a temperature of 15°C-35°C. Preferably, the first and second tools 13, 21 have a temperature of 50-100°C, preferably 65-85°C, when pushing on the rotor laminations 5. During molding, the rotor laminations 5 and the tools 13, 21 are then heated to a temperature of between 150-200°C, preferably 160-180°C.

[0058] The terms "radial," "axial," "tangential," and "circumferential direction" used in this application always refer to the rotational axis of the rotor of the electric machine. The terms "left," "right," "top," "bottom," "above," and "below" serve only to clarify which areas of the figures are currently being described in the text. The later embodiment of the invention can also be arranged differently. Furthermore, the invention is not limited to the embodiments illustrated in the figures. The above description is therefore not to be regarded as limiting, but as explanatory. The following patent claims are to be understood in such a way that a named feature is present in at least one embodiment of the invention. This does not exclude the presence of further features.If the patent claims and the above description define 'first' and 'second' features, this designation serves to distinguish between two similar features without establishing a ranking. List of reference symbols 1 rotor 2 electric machine 3 Drivetrain 4 Motor vehicle 5 rotor lamination 6 rotor bodies 7 axis of rotation 8 permanent magnet 9 Interlocking hole 10 channel 11 Contour 12 Longitudinal extension 13 Tools 14 Interlocking hole 15 channel 16 Contour 17 Longitudinal extension 18 slot Section 19 Section 20 21 Tools 22 Production arrangement 23 Stator 24 Base plate

Claims

[1] Rotor (1) for an electric machine (2), in particular for use within a drive train (3) of a hybrid or fully electric motor vehicle (4), wherein the rotor (1) is formed from a plurality of rotor bodies (6) constructed from packaged rotor laminations (5), and the rotor bodies (6) are equipped with permanent magnets (8), wherein the rotor bodies (6) are rotated relative to one another about a common axis of rotation (7), the rotor (1) thereby having an angle of twist α defined by the total rotation of the rotor bodies (6), characterized by , that the rotor laminations (5) each have at least one first interlacing hole (9) which can be axially penetrated by a first rod-like tool (13), by means of which the relative interlacing of two axially adjacent rotor bodies (6) can be adjusted, and the first interlacing holes (9) in the rotor (1) are arranged in alignment with one another, so that a first channel (10) extending axially through the rotor (1) is formed, wherein the first interlacing holes (9) have a contour (11) deviating from the circular shape, which has a longitudinal extension (12) in the radial direction. [2] Rotor (1) according to claim 1, characterized by , that the rotor laminations (5) each have at least one second interlacing hole (14) which can be axially penetrated by a second rod-like tool (21), by means of which the relative interlacing of two axially adjacent rotor bodies (6) can be adjusted, and the second interlacing holes (14) in the rotor (1) are arranged in alignment with one another, so that a second channel (15) extending axially through the rotor (1) is formed, wherein the second interlacing holes (14) have a contour (16) deviating from the circular shape and having a longitudinal extension (17) in the radial direction. [3] Rotor (1) according to claim 1 or 2, characterized by that the first interlacing holes (9) and / or the second interlacing holes (14) of the rotor laminations (5) are substantially identical. [4] Rotor (1) according to one of the preceding claims, characterized bythat the first interlocking holes (9) and / or second interlocking holes (14) are / are designed as an elongated hole (18), wherein the elongated hole (18) has a substantially rectangular section (19) to which a semicircular section (20) adjoins on both sides in the radial direction. [5] Rotor (1) according to claim 4, characterized by that the rectangular section (19) has a length L in the radial direction and the semicircular sections (20) each have a diameter DS, the length L being between L=0.1 * DS and L=0.2*DS. [6] Manufacturing arrangement (22) for producing a rotor (1) according to one of claims 1-5, comprising a first rod-like tool (13), and a plurality of rotor bodies (6) constructed from stacked rotor laminations (5), wherein the rotor bodies (6) are equipped with permanent magnets (8) and are rotated relative to one another about a common axis of rotation (7), wherein the rotor (1) thereby has an angle of twist α defined by the total rotation of the rotor bodies (6), wherein the rotor laminations (5) each have at least one first interlacing hole (9) which can be axially penetrated by the first rod-like tool (13), by means of which the relative interlacing of two axially adjacent rotor bodies (6) can be adjusted, and the first interlacing holes (9) in the rotor (1) are arranged in alignment with one another, so that a first channel (10) extending axially through the rotor (1) is formed, wherein the first interlacing holes (9) have a contour (11) deviating from the circular shape, which has a longitudinal extension (12) in the radial direction, and the rod-like first tool (13) in the state inserted into the first interlocking holes (9) passes through the first interlocking holes (9) with play in the radial direction and essentially without play in the circumferential direction. [7] Method for producing a rotor (1) comprising the following steps: Providing a first rod-like tool () and Providing a plurality of rotor bodies (6) constructed from stacked rotor laminations (5), wherein the rotor bodies (6) can be equipped with permanent magnets (8) and can be rotated relative to one another about a common axis of rotation (7), wherein the rotor (1) thereby has an interlacing angle α defined by the total rotation of the rotor bodies (6), wherein the rotor laminations (5) each have at least one first interlacing hole (9) through which the first rod-like tool (13) can axially penetrate, by means of which the relative interlacing of two axially adjacent rotor bodies (6) can be adjusted, and the first interlacing holes (9) in the rotor (1) are arranged in alignment with one another, so that a first channel (10) extending axially through the rotor (1) is formed, wherein the first interlacing holes (9) have a contour (11) deviating from the circular shape and having a longitudinal extension (12) in the radial direction, Pushing the rotor laminations (5) through the first interlocking holes (9) onto the rod-like first tool (13). [8] Method according to claim 7, characterized by that the rotor laminations (5) are pushed on at a temperature of the rotor laminations of 15-35°C. [9] Method according to claim 7 or 8, characterized by that the first tool (13) and / or the second tool (21) has / has a temperature of 50-100°C, preferably 65-85°C, when pushing on the rotor laminations (5). [10] Electric machine (2), in particular for use within a drive train (3) of a hybrid or fully electrically powered motor vehicle (4), comprising a rotor (1) according to one of claims 1-5.

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