Rotor with optimized rotor lamination geometry for fluid guidance

Abstract

The invention relates to a rotor (1) for an electric machine, comprising a rotor core (2) having a plurality of axially stacked rotor laminations (3), each of which is arranged at a predetermined rotation angle relative to an axially adjacent rotor lamination (3), and a rotor shaft (4) on which the rotor laminations (3) are mounted, wherein the rotor shaft (4) forms a torque transmission connection (5) with a groove (6) formed in the rotor lamination (3), wherein the rotation angle and the width of the groove (6) are matched to each other, thereby forming a duct (10) for guiding a fluid which extends axially through the rotor (1).

Description

Technical Field

[0001] The present invention relates to a rotor for an electric machine, the rotor having a rotor stacked core, the rotor stacked core having a plurality of axially stacked rotor laminations, each of the rotor laminations being arranged at a predetermined rotation angle with respect to an axially adjacent rotor lamination, and the rotor having a rotor shaft on which the rotor laminations are fitted, wherein the rotor shaft forms a torque transmission connection with grooves formed in the rotor laminations. Background Art

[0002] Rotors for electric machines are known from the prior art which consist of stacked cores, so-called "rotor stacks" or "stacks". These stacked cores are usually connected to the shaft in a form-fitting manner by means of a tongue and groove connection or in a friction-fitting manner by means of a pressure connection. If the electric machine is arranged in an oil chamber, oil / hydraulic medium / fluid / coolant etc. can be used to cool the rotor. For this purpose, oil guides are required in the rotor shaft, through which the oil is conveyed radially through the rotor shaft to the rotor stack or to the plurality of rotor stacks.

[0003] However, the prior art always has the following disadvantages: openings or ducts are required in the rotor laminations to guide the oil axially outward. For this purpose, additional openings are usually provided in the rotor core. In particular, if the rotor laminations need to be twisted and therefore a large number of grooves connected to the grooves via tongues for transmitting torque must be formed in the rotor laminations, the grooves and / or tongues are arranged in different ways in each rotor lamination, so that usually no installation space for the oil guide openings can be obtained due to many offset grooves.

[0004] The object of the present invention is therefore to avoid or at least mitigate the disadvantages of the prior art. In particular, a rotor is to be provided which is simple and inexpensive to manufacture on the one hand and which provides, in a particularly simple manner, for example coolant guides which axially distribute the coolant which passes through the rotor shaft. Summary of the invention

[0005] According to the invention, this object is achieved in a device of the general type, in which the angle of rotation and the width of the grooves are matched to one another so that a duct for fluid guidance, in particular cooling (oil) guidance, is formed which extends axially through the rotor. This means that the grooves of axially adjacent rotor laminations are arranged to overlap at least partially so that the grooves are axially connected to one another. This has the advantage that the grooves in the rotor laminations which have to be provided for torque transmission also serve as oil-conducting grooves. Thus, advantageously, no additional, specially defined openings need to be maintained in the laminated core.

[0006] Advantageous embodiments are claimed in the dependent claims and are explained below.

[0007] According to an advantageous embodiment, a plurality of grooves may be formed in each rotor lamination, at least one of the grooves being used for torque transmission and at least another of the grooves being used for fluid guidance, thereby ensuring torque transmission and fluid guidance at the same time.

[0008] It is also advantageous if the rotor shaft is designed as a hollow shaft in which at least one radially continuously extending fluid duct leading to the groove is formed. Thus, the interior of the rotor shaft is connected to the groove so that the coolant / fluid can be conveyed to the groove and can be further distributed axially from the groove.

[0009] Furthermore, it is preferred that at least as many grooves are formed in each rotor lamination as rotor laminations forming the rotor lamination core, wherein, depending on the axial position in the rotor lamination core, further ones of the grooves form a torque-transmitting connection. This enables a particularly simple way to achieve a twisting of the rotor lamination by selecting specific grooves in the rotor lamination. In other words, for example, the second groove has a different rotation angle in the axial direction relative to the first rotor lamination than the third groove, so that the second rotor lamination is connected to the rotor shaft in the axial direction via the second groove.

[0010] Furthermore, it is preferred that the grooves that do not form a torque transmission connection are used for fluid guidance. Since a plurality of grooves are formed in each rotor lamination, but only one of the grooves (connected with the grooves by means of a tongue) is connected to the rotor shaft via the tongue, the other grooves in the rotor laminated core for torque transmission with other rotor laminations can be used on one rotor plate for coolant supply.

[0011] According to a particularly preferred embodiment, the rotation angle can be selected such that it provides a twisting of the rotor laminations. This means that the rotation angle differs from the pole angle at which the poles of the rotor are arranged spaced apart in the circumferential direction, in particular the rotation angle differs from the pole angle by the twisting angle. A twisting of the rotor is thus achieved in a particularly simple manner.

[0012] In an advantageous development, one of the grooves that forms a torque-transmitting connection between the rotor shaft and the first rotor lamination can be combined with another of the grooves that forms a torque-transmitting connection between the rotor shaft and the rotor lamination axially adjacent to the first rotor lamination, the two grooves being arranged offset by a rotation angle. Thus, a twisting of the rotor lamination is achieved.

[0013] It is also preferred that one of the grooves forming a torque transmission connection between the rotor shaft and the first rotor lamination is arranged offset by an angle different from the rotation angle relative to another of the grooves forming a torque transmission connection between the rotor shaft and a rotor lamination axially spaced apart from the first rotor lamination. This is in particular due to the fact that the rotation angle is different from the pole angle so that the grooves cannot be arranged evenly distributed. In particular, the grooves assigned to the first rotor lamination in the axial direction for torque transmission are rotated by an angle different from the rotation angle relative to the grooves assigned to the last rotor lamination in the axial direction for torque transmission.

[0014] It is also advantageous if the rotor shaft is connected to the grooves formed in the rotor laminations for transmitting torque by means of one or more tongue-to-groove connections. This also influences the arrangement of the grooves. Furthermore, the force distribution is improved.

[0015] It is particularly advantageous if the rotor laminations are designed as identical components. The rotor laminations can therefore be produced with the same tool, for example with a stamping tool. The rotor can thus be produced cost-effectively. Furthermore, the fact that only one type of rotor lamination is required can prevent a certain type of rotor lamination from being lost in the assembly, for example due to a mix-up.

[0016] In other words, the present invention relates to a rotor laminated core having a plurality of grooves arranged at different intervals in the circumferential direction. The grooves used for torque transmission without tongue-and-groove connection with the rotor shaft are arranged to be axially connected so that these grooves can be used for fluid guidance. For fluid guidance, the rotor shaft has radial through holes to form fluid conduits from the holes to the grooves not used for torque transmission.

[0017] Furthermore, it is advantageous if the torque-transmitting connection is formed by a coupling element and a groove formed in the rotor lamination, the coupling element being constructed separately from the rotor lamination and the coupling element being connected to the rotor shaft in a rotationally fixed manner. In other words, in contrast to a typical tongue-and-groove connection for connecting rotor laminations, the coupling element, such as a tongue, is formed separately. Thus, instead of a projection forming the coupling element, a groove has to be provided on the rotor lamination geometry, into which groove the coupling element engages. This advantageously leads to more design options for the rotor lamination, since a plurality of grooves can also be provided and only during assembly does it have to be selected which groove is connected to the coupling element to achieve a specific orientation in the circumferential direction.

[0018] According to a preferred embodiment, the torque-transmitting connection can be designed as a tongue-and-groove connection, wherein the coupling element is designed separately from the rotor shaft. The coupling element is preferably designed as a tongue, for example in the form of a parallel key. By designing the tongue as a separate component, the structural design of the rotor shaft does not need to be changed. In addition, the separate tongue can be manufactured in a particularly simple and cost-effective manner. Alternatively, the coupling element can also be formed integrally with the rotor shaft.

[0019] In particular, it is preferred that the rotor laminations are each arranged rotated by a predetermined angle relative to the axially adjacent rotor laminations. Thus, the torsion of the rotor can be advantageously maintained, which has a positive effect on the noise characteristics. According to an advantageous embodiment, the rotor laminations are rotated by a constant angle relative to each other.

[0020] Furthermore, advantageously, a plurality of grooves are formed in each rotor lamination, which grooves are arranged offset from each other by a predetermined angle. This makes it possible to achieve a twisting of the rotor, since the groove into which the coupling element is inserted can be selected according to the desired offset relative to the rotor shaft and thus relative to the desired offset of the other rotor lamination. This allows the rotation of the rotor lamination to be determined when the rotor lamination is installed. Furthermore, this makes it possible to use the same rotor lamination at different positions in the rotor laminated core, i.e. the rotor lamination has a different rotation relative to the rotor shaft. In other words, the "correct" groove for the torque-transmitting connection must be selected during assembly to achieve a twisting.

[0021] It is also advantageous that the rotor has a plurality of poles arranged evenly distributed in the circumferential direction, and the predetermined angle is selected so that the poles of the rotor are twisted. That is, the predetermined angle is different from the pole angle at which the poles are arranged in the circumferential direction. The twisting of the poles is thereby achieved by stacking the rotor core in the axial direction.

[0022] It is also preferred that each of the plurality of grooves is assigned to a position of the rotor lamination in the rotor stack. This means that, depending on the intended position of the respective rotor lamination in the rotor stack, a different groove is used for connection to the rotor shaft. In other words, each of the grooves in the rotor lamination is assigned to exactly one position in the rotor stack.

[0023] In a preferred embodiment, the predetermined angle at which the grooves in the rotor laminations are offset from each other may be a pole angle corresponding to the angular distance between the poles of the rotor or a sum of a multiple of the pole angle and a torsion angle of the pole torsion. Thus, the grooves may be appropriately distributed on the inner circumference of the rotor laminations so that the grooves do not overlap each other.

[0024] It is particularly preferred that the rotor laminations are connected to the rotor shaft via a plurality of torque-transmitting connections. Thus, forces can be better transmitted between the rotor shaft and the rotor core. Accordingly, for example, two grooves of each rotor lamination are connected to two grooves in the rotor shaft via two coupling elements.

[0025] According to an advantageous development, a plurality of torque transmission connections can be arranged evenly distributed in the circumferential direction, so that the power transmission is evenly distributed on the rotor laminations or evenly distributed on the circumference of the rotor shaft.

[0026] In other words, the invention also relates to a rotor with a stacked core, wherein different grooves are formed in the rotor laminations of the stacked core, the rotor comprising a shaft with grooves and tongues for transmitting torque between the rotor laminations and the corresponding grooves of the rotor shaft. According to the invention, the combination of a typical tongue-and-groove connection by means of a separate tongue and the use of differently arranged grooves in the stacked core reduces the number of different rotor laminations, since the same rotor lamination can be used multiple times in a stacked rotor bundle. The grooves are arranged so that each groove maintains the correct torsion angle. Different grooves are used during assembly depending on the position of the stacked core. This ensures the correct torsion angle of the stacked core. Power is transmitted via one or more tongues, such as parallel keys. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is explained below with the aid of the accompanying drawings. In the accompanying drawings:

[0028] Figure 1 shows a perspective view of a rotor according to the invention,

[0029] Figure 2 shows a front view of the rotor,

[0030] Figure 3 A front view of the rotor laminations of the rotor is shown,

[0031] Figure 4 shows a perspective cross-sectional view of a rotor lamination,

[0032] Figure 5 shows a top view of a stacked rotor core consisting of five stacked rotor laminations,

[0033] Figure 6 and Figure 7 shows a perspective view of a rotor shaft of a rotor with and without a coupling element,

[0034] Figure 8 Shows Figure 2 The enlarged cross section of

[0035] Fig. 9 The rotor is shown along Figure 8A cross-sectional view taken along line IX-IX on FIG.

[0036] Fig.10 The rotor is shown along Figure 8 A cross-sectional view taken along line XX in FIG.

[0037] The drawings are merely schematic in nature and are only useful for understanding the present invention. Identical elements are provided with the same reference numerals. DETAILED DESCRIPTION

[0038] Figure 1 A rotor 1 for an electric machine according to the invention is shown. The rotor 1 has a stacked rotor core 2 consisting of a plurality of coated rotor laminations 3 stacked in an axial direction. The stacked rotor core 2, more precisely the poles of the rotor 1 arranged in the stacked rotor core 2, have or undergo a so-called twist or rotation. This means that the rotor laminations 3 are arranged to be rotated relative to each other by a predetermined rotation angle γ. In this way, a twist of the poles of the rotor 1 is achieved. In particular, the rotor laminations 3 are each arranged to be rotated by a rotation angle γ relative to the axially adjacent rotor laminations 3. In particular, the rotation angle γ between the axially adjacent rotor laminations 3 is constant.

[0039] The rotor 1 has a rotor shaft 4. The rotor laminations 3 are fitted onto the rotor shaft 4, in particular onto the outer circumference of the rotor shaft 4. The rotor shaft 4 is connected to the wheel 3 in a rotationally fixed manner. The rotor shaft 4 is connected to the groove 6 formed in the rotor laminations 3 via a torque transmission connection 5. The connection 5 is formed by a coupling element 7 formed separately from the rotor laminations 3 and the groove 6 of the rotor laminations 3. In the embodiment shown, the coupling element 7 is formed separately from the rotor shaft 4, but the coupling element can alternatively also be formed integrally with the rotor shaft 4, even if this is not shown. In the embodiment shown, the coupling element 7 is designed as a tongue 8, in particular in the form of a parallel key. The tongue 8 engages in the groove 9 in the rotor shaft 4 and in the groove 6 of the rotor laminations 3, thereby fixing the rotor laminations 3 on the rotor shaft 4 in a rotationally fixed manner by form fit. In the embodiment shown, the connection 5 is therefore designed as a tongue-to-groove connection. In the embodiment shown, each rotor lamination 3 is connected to the rotor shaft 4, in particular to the groove 9 of the rotor shaft 4, via two tongues 8. However, the rotor stack 3 can also be connected to the rotor shaft 4 via tongues or via more than two tongues, even though this is not shown.

[0040] The grooves 6 of the rotor laminations 3 are arranged on the radial inner circumference of the rotor laminations 3. The grooves 6 extend continuously in the axial direction through the respective rotor laminations 3. The grooves 6 have a substantially rectangular cross section. The grooves 6 each have the same cross section, which corresponds to a partial cross section of the coupling element 6 and / or a cross section of the groove 9 in the rotor shaft 4.

[0041] Figure 2 A front view of a rotor 1 is shown. In the rotor lamination 3, a plurality of grooves 6, in the embodiment shown, ten grooves 6 are arranged distributed on the inner circumference. The arrangement, height and / or in particular the width of the grooves 6 are adapted to the rotation angle γ, so that the grooves 6 form a duct 10 which extends continuously through the rotor core 2 in the axial direction. The duct 10 can be used, for example, for guiding a coolant of the rotor 1. Among the grooves 6, at least one torque groove 11 is used for transmitting torque, and at least one further coolant groove 12 is used for guiding a coolant.

[0042] exist Figure 2 The rotation of the stacked rotor core 2 can be clearly seen in the front view. Pole recesses 13 for the poles of the rotor 1 are provided in the rotor laminations 3. The pole recesses 13 are arranged in the rotor laminations 3 so as to be evenly distributed over the circumference. This means that the pole recesses 13 of the rotor laminations 3 are arranged to be spaced apart at a pole angle β at constant angular intervals. The pole angle β therefore corresponds to 360° divided by the number of poles of the rotor 1, which is 36° in the embodiment shown. The pole recesses 13 of the rotor laminations 3 are arranged to be rotated by a torsion angle α relative to the pole recesses 13 of the axially adjacent rotor laminations 3. This torsion angle α and the resulting offset of the rotor laminations 3 can be Figure 2 It can be seen on the pole recess 13 (or on other recesses in the rotor stack 3).

[0043] Each rotor lamination 3 of the rotor stacked core 2 has at least as many grooves 6 as the rotor laminations 3 of the rotor stacked core 2. The grooves 6 are arranged so that a predetermined rotation angle α of the rotor laminations 3 is maintained by these grooves. In this case, different grooves 6 are used for each rotor lamination 3 of the rotor stacked core 2, depending on the position of the rotor lamination 3 in the rotor stacked core, and the corresponding rotor lamination 3 is connected to the rotor shaft 4 via the groove. In the embodiment shown, the stacked rotor core 2 is formed by five stacked rotor laminations 3. However, the stacked rotor core 2 can also have less than five or more than five stacked rotor laminations 3, even if this is not shown. Therefore, each rotor lamination 3 has at least five grooves 6.

[0044] Reference Figure 3 and Figure 4The arrangement structure of the grooves 6 is described, wherein a single rotor lamination 3 is shown. The rotor lamination 3 has a first groove 14, a second groove 15, a third groove 16, a fourth groove 17 and a fifth groove 18 in the grooves 6. Depending on the position of the rotor lamination 3 in the rotor stacked core 2, the first groove 14, the second groove 15, the third groove 16, the fourth groove 17 or the fifth groove 18 is used as a torque groove 11, and the rotor lamination 3 is connected to the rotor shaft 4 in a torque-transmitting manner via the torque groove. For example, the first groove 14 is used as a torque groove 11 for the first rotor lamination 3, which forms the axial end face of the rotor stacked core 2, the second groove 15 is used as a torque groove 11 for the second rotor lamination 3 axially adjacent to the first rotor lamination 3, the third groove 16 is used as a torque groove 11 for the third rotor lamination 3 axially adjacent to the second rotor lamination 3, and so on.

[0045] In this case, the first groove 14, the second groove 15, the third groove 16, the fourth groove 17 and the fifth groove 18 are formed in each rotor lamination 3 so that the positions are established and the positions corresponding to the positions in the rotor laminated core 2 are determined only during assembly when the torque groove 11 is connected to the tongue 7. The remaining grooves 6 are used as coolant grooves 12.

[0046] In order to achieve the twisting of the poles of the rotor 1, the arrangement structure of the grooves 6 is matched to the twisting angle α. In particular, the angular distance between the grooves 6, in particular the angular distance between the first groove 14 and the second groove 15 or between the second groove 15 and the third groove 16 or between the third groove 16 and the fourth groove 17, etc. corresponds to the rotation angle γ. The rotation angle γ corresponds to the sum of the twisting angle α and the pole angle β or to the sum of the twisting angle α and multiple times of the pole angle β. In other words, the grooves 6 used as torque grooves 11 for axially adjacent rotor laminations 3, such as the first groove 14 and the second groove 15, are arranged so that the two poles of the axially adjacent rotor laminations 3 are offset by the twisting angle α. Since the poles are arranged at regular angular intervals, that is, at intervals of the pole angle β, the grooves 6 used as torque grooves 11 for axially adjacent rotor laminations 3 are offset from each other by the twisting angle α and any multiple of the pole angle β. Therefore, the third groove 16 is offset by twice the twisting angle α and any multiple of the pole angle β relative to the first groove 14.

[0047] In the embodiment shown, the distance between the grooves 6 provided as torque grooves 11 for axially adjacent rotor laminations 3, i.e. the rotation angle γ, is the same. In particular, the rotation angle γ corresponds to the sum of the torsion angle α and the pole angle β. That is, the distance between the first groove 14 and the third groove 16 is 2γ. This also means that the distance between the first groove 14 and the fourth groove 17 is 3γ. That is, the distance between the first groove 14 and the fifth groove 18 is 4γ.

[0048] Since two tongues 8 are provided in the illustrated embodiment of the rotor 1 to form the torque transmission connection 5, the rotor lamination has two first grooves 14, two second grooves 15, two third grooves 16, two fourth grooves 17 and two fifth grooves 18, wherein the first grooves 14, the second grooves 15, the third grooves 16, the fourth grooves 17 and / or the fifth grooves 18 are all opposite in the circumferential direction. Since the grooves 6 are offset by the torsion angle α in addition to the pole angle β, the spacing of the fifth groove 18 from the first groove 14 by the angle δ is different from the spacing of the torsion angle γ between the other circumferentially adjacent grooves 6.

[0049] Therefore, all grooves 6 of axially adjacent rotor laminations 3 can be arranged to be completely consistent. The grooves 6, in particular the width of the grooves 6, are matched to the rotation angle γ (and therefore to the torsion angle α and the polar angle β) and therefore to the arrangement structure of the grooves 6, so that the ducts 10 formed by the coolant grooves 12 are formed to be axially continuous. This means that the cross sections of the coolant grooves 12 at least partially overlap.

[0050] Figure 5 A view of a stacked rotor core 2 from above is shown, in which it can be seen that the individual stacked rotor laminations 3 are arranged rotated relative to one another. The rotor laminations 3 are rotated relative to one another by the same rotation angle γ, which appears different due to the curvature of the rotor laminations 3 when viewed from above.

[0051] Figure 6 and Figure 7 A tongue 8 (see Figure 6 ) and the tongue 8 not inserted (see Figure 8 ) is a perspective view of a rotor shaft 4. The rotor shaft 4 is designed as a hollow shaft 19. A groove 9 with a constant depth is formed on the outer circumference of the rotor shaft 4. In the illustrated embodiment, the rotor shaft 4 has two grooves 9 arranged opposite to each other. The groove 9 extends longer than the tongue 8 in the axial direction. The groove 9 is open to the axial end face of the rotor shaft 4. Therefore, the tongue 8 can be pushed in along the axial direction. The tongue 8 has a larger axial range than the stacked rotor core 2.

[0052] The rotor shaft 4 has at least one pipe 20 extending in the radial direction and connecting the inner periphery of the rotor shaft 4 to the outer periphery of the rotor shaft 4. The pipe 19 is used to guide the coolant. In the embodiment shown, a plurality of pipes 20 are formed. The pipes 20 are arranged so that the pipes lead to the grooves 6, in particular to the coolant grooves 12, when the rotor stack 3 is mounted on the rotor shaft 4. Therefore, the coolant can be guided from the inside of the rotor shaft 4 through the pipes 20 into the coolant grooves 12 until the rotor stack 3.

[0053] Fig. 9 and Fig.10 The rotor 1 is shown along Figure 8 The lines IX-IX and Figure 8 A three-dimensional cross-sectional view taken along line XX in FIG. Fig. 9 and Fig.10 The dashed line in indicates the coolant flow 21 from the inside of the rotor shaft 4 through the duct 10. Fig. 9 It can be seen that the second groove 15, the third groove 16, the fourth groove 17 and the fifth groove 18 completely overlap, and an offset is formed between the fifth groove 18 and the first groove 14. Therefore, the first groove 14 and the fifth groove 18 only partially overlap. A continuous axial pipe 10 is formed by the partial overlap between all the grooves 6. Fig.10 As can be seen in FIG. 1 , the fourth groove 17 and the fifth groove 18 completely overlap, an offset is formed between the fifth groove 18 and the first groove 14, and the first groove 14, the second groove 15 and the third groove 16 completely overlap. Therefore, the first groove 14 and the fifth groove 18 only partially overlap. A continuous axial duct 10 is formed by the partial overlap between all the grooves 6. Depending on which of the coolant grooves 12 is cut, the offset is located at different points in the rotor core 2. In the torque groove 11, all the grooves 6 completely overlap in the axial direction.

[0054] Description of Reference Numerals

[0055] 1 Rotor

[0056] 2 Rotor stacked core

[0057] 3 Rotor laminations

[0058] 4 Rotor shaft

[0059] 5. Connect

[0060] 6 Grooves

[0061] 7 Connecting elements

[0062] 8 Tongue

[0063] 9 Grooves

[0064] 10 Pipeline

[0065] 11 Torque groove

[0066] 12 Coolant groove

[0067] 13 Pole concave

[0068] 14 First groove

[0069] 15 Second groove

[0070] 16 Third groove

[0071] 17 Fourth groove

[0072] 18 Fifth groove

[0073] 19 Hollow shaft

[0074] 20 Pipe

[0075] 21 Coolant flow

[0076] α Twist angle

[0077] β polar angle

[0078] γ Rotation angle

[0079] δ Angle.

Claims

1. A rotor (1) for an electric motor, the rotor comprising a rotor stacked core (2), the rotor stacked core comprising a plurality of axially stacked rotor laminations (3), each of the rotor laminations being arranged at a predetermined rotation angle with respect to an axially adjacent rotor lamination (3), and the rotor comprising a rotor shaft (4), the rotor laminations (3) being mounted on the rotor shaft, wherein: The rotor shaft (4) forms a torque transmission connection (5) with a groove (6) formed in the rotor lamination (3), characterized in that the rotation angle and width of the groove (6) match each other, thereby forming a duct (10) for fluid guidance extending axially through the rotor (1), and a plurality of grooves (6) are formed in each rotor lamination (3), wherein at least one of the grooves (6, 11) is used for torque transmission and at least another of the grooves (6, 12) is used for fluid guidance.

2. The rotor (1) according to claim 1, characterized in that The rotor shaft (4) is designed as a hollow shaft (19), in which at least one radially continuously extending fluid conduit (20) is formed, the fluid conduit leading to the grooves (6, 12).

3. The rotor (1) according to claim 1 or 2, characterized in that At least as many grooves (6) are formed in each rotor lamination (3) as there are rotor laminations (3) forming a rotor laminated core (2), wherein, depending on the axial position in the rotor laminated core (2), further ones of the grooves (6) form a torque-transmitting connection (5).

4. The rotor (1) according to claim 3, characterized in that The groove (6) which does not form the torque-transmitting connection (5) serves for fluid guidance.

5. The rotor (1) according to claim 1 or 2, characterized in that The rotation angle is selected such that it provides a twisting of the rotor laminations (3).

6. The rotor (1) according to claim 1 or 2, characterized in that One of the grooves (6) forming the torque transmission connection (5) between the rotor shaft (4) and the first rotor lamination (3) is arranged offset by the rotation angle relative to another of the grooves (6) forming the torque transmission connection (5) between the rotor shaft (4) and a rotor lamination (3) formed axially adjacent to the first rotor lamination (3).

7. The rotor (1) according to claim 1 or 2, characterized in that One of the grooves (6) forming the torque transmission connection (5) between the rotor shaft (4) and the first rotor lamination (3) is arranged offset by an angle different from the rotation angle relative to another of the grooves (6) forming the torque transmission connection (5) between the rotor shaft (4) and a rotor lamination (3) axially spaced apart from the first rotor lamination (3).

8. The rotor (1) according to claim 1 or 2, characterized in that The rotor shaft (4) is connected to the grooves (6) for torque transmission formed in the rotor laminations (3) by means of one or more tongue and groove connections.

9. The rotor (1) according to claim 1 or 2, characterized in that The rotor laminations (3) are designed as identical components.

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