DE102022201479A1 - Rotor for an electric machine and method - Google Patents

Abstract

The invention relates to a rotor (1) for an electrical machine. The rotor (1) comprises a rotor shaft (2) extending along an axial direction (A) and having an outer peripheral side (3). Furthermore, the rotor (1) comprises a sleeve-shaped bushing body (4) which extends along the axial direction (A) and is arranged radially on the outside on the rotor shaft (2). In addition, the rotor (1) comprises a hollow-cylindrical laminated rotor core (6) extending along the axial direction (A). In addition, the laminated rotor core (6) is arranged radially on the outside of the bushing body (4). An outer diameter (d_a_RW) of the rotor shaft (2), measured perpendicularly to the axial direction (A), is advantageously designed with a larger overlap value by a predetermined first fit dimension (m1) than an inner diameter (d_i_BK), also measured perpendicularly to the axial direction (A), of the sleeve-shaped socket body (4). Furthermore, an outer diameter (d_a_BK) of the bushing body (4) measured perpendicularly to the axial direction (A) has a larger overlap value by a predetermined second fit dimension (m2) than an inner diameter (d_i_RBP) of the laminated rotor core, also measured perpendicularly to the axial direction (A). (6). According to the invention, the excess of the first fit (m1) is greater than the excess of the second fit (m2).

Description

The invention relates to a rotor for an electrical machine and an electrical machine with such a rotor. The invention also relates to a method for manufacturing such a rotor.

Rotors of electrical machines for electric motors have to transmit high torques. In order to ensure this, it is common in conventional rotors to join the rotor laminations of a laminated rotor core to a rotor shaft of the rotor with a high degree of radial overlap. However, when the rotor lamination stack is joined to the rotor shaft, chips can form, the lamination stack can bend and the individual rotor laminations can be damaged overall. This can impair the non-rotatable connection between the rotor shaft and the laminated core of the rotor, which in turn can lead to a reduction in the maximum torque that can be transmitted. In the worst case, this can also lead to higher reject rates in the manufacture of the rotor.

It is therefore an object of the present invention to provide an improved embodiment for a rotor in which the problems explained above are at least partially, ideally completely, eliminated. In particular, an improved rotor is to be created, which ensures a particularly non-rotatable attachment of the laminated rotor core to the rotor shaft, so that particularly high torques can also be transmitted. Likewise, an improved manufacturing method for such a rotor is to be created.

This object is solved by the subject matter of the independent patent claims. Preferred embodiments are subject matter of the dependent patent claims.

The basic idea of the invention is therefore to implement the non-rotatable attachment of the rotor core to the rotor shaft indirectly with the aid of a bushing body arranged radially between the rotor shaft and the rotor core.

This makes it possible to first join the laminated rotor core and the bushing body to one another in a rotationally fixed manner, ie to preassemble, and only then to join the laminated rotor core and the bushing body as a unit in a rotationally fixed manner to the rotor shaft. In this way, a non-rotatable connection of the laminated rotor core to the rotor shaft, which is suitable for the transmission of very high torques, is achieved via the bushing body that is essential to the invention. At the same time, the damage mentioned at the outset when joining the laminated rotor core, in particular the chip formation mentioned and the undesired bending of the rotor laminations, which has also been explained, are largely or even completely avoided.

A further advantage of using a bushing body is that the bushing body, in contrast to the laminated rotor core consisting of a plurality of individual rotor laminations, can be made in one piece, as a result of which the risk of damage can be significantly reduced.

In the solution presented here, the bush body and the rotor shaft are connected to one another in a non-positive and non-rotatable manner by means of a press fit. Various connection variants are therefore available for the connection between the rotor lamination and the bushing body, such as a non-positive or a material-to-material variant. When joining the rotor lamination to the bushing body, a press fit or a clearance fit can initially be selected. This in turn protects the sensitive rotor laminations of the rotor laminated core when it is attached to the socket body. At the same time, a mechanically highly resilient non-positive connection is created between the bush body and the rotor shaft, which is suitable for the transmission of very high torques.

Specifically, the rotor according to the present invention includes a rotor shaft extending along an axial direction and having an outer peripheral side. Furthermore, the rotor includes a sleeve-shaped bushing body that extends along the axial direction and is arranged radially on the outside on the rotor shaft, so that the bushing body rests with an inner peripheral side on the outer peripheral side of the rotor shaft. In addition, the rotor according to the invention comprises a hollow-cylindrical laminated rotor core extending along the axial direction. The laminated rotor core in turn comprises a plurality of rotor laminations stacked on top of one another along the axial direction. In addition, the laminated rotor core is arranged radially on the outside on the bushing body, so that the laminated rotor core rests with an inner peripheral side on an outer peripheral side of the bushing body. According to the invention, the rotor shaft is non-positively and non-rotatably connected to the bushing body by means of a press fit.

For this purpose, an outer diameter of the rotor shaft measured perpendicularly to the axial direction can preferably be larger by a predetermined first fitting dimension than an inner diameter of the sleeve-shaped bushing body, also measured perpendicularly to the axial direction.

In a preferred embodiment, the bushing body is non-positively and non-rotatably connected to the laminated rotor core by means of a press fit. In this embodiment, an outer diameter of the bushing body measured perpendicularly to the axial direction can particularly preferably be larger by a predetermined second fit dimension than an inner diameter of the laminated rotor core also measured perpendicularly to the axial direction to form the press fit.

The first dimension of fit is particularly preferably larger than the second dimension of fit. This can at least counteract damage to the sensitive laminated rotor core with the rotor laminations.

At least one of the two dimensions of fit is preferably between 5 μm and 200 μm. Particularly preferably, both dimensions of fit can each be between 5 μm and 200 μm; alternatively or additionally, the sum of the two dimensions of fit can also be between 5 μm and 200 μm. In this way, it is ensured in all variants on the one hand that the laminated rotor core and bushing body as well as the bushing body and rotor shaft can be joined together in a torsion-proof manner without any problems and on the other hand that an effective, torsion-proof connection that ensures the transmission of high torques is created.

Particularly expediently, the sleeve-shaped bushing body can be prestressed radially outwards against the laminated rotor core in order to form the non-positive connection with the laminated rotor core, in particular by means of an axial through-slot. In this way, a non-rotatable non-positive connection can be created between the bushing body and the laminated core of the rotor, which also enables the transmission of very high torques.

In another preferred embodiment of the rotor according to the invention, the bushing body is non-rotatably connected to the laminated rotor core by means of an integral connection, in particular by means of a soldered connection or welded connection. This variant is technically somewhat more complex to implement than the non-positive connection explained above. For this purpose, said material connection, in particular in the form of a soldered connection or welded connection, causes a quasi one-piece formation of the bushing body and rotor core with the rotor laminations, whereby extremely high torques can be transmitted between the bushing body and rotor core.

In a further advantageous embodiment, the bushing body can also be joined without overlapping with a so-called loose fit, that is to say a negative fit dimension, in the laminated rotor core. In this embodiment, an outer diameter of the bushing body measured perpendicularly to the axial direction is smaller by a predetermined second fitting dimension than an inner diameter of the laminated rotor core also measured perpendicularly to the axial direction. This variant is particularly useful if the bushing body is to be connected to the laminated rotor core in a materially bonded manner, as suggested above.

In a further advantageous embodiment, the bushing body can also be joined into the laminated rotor core with a so-called transition fit, ie a small positive or negative fit dimension.

According to an advantageous development, on the outer peripheral side of the rotor shaft and/or on the inner peripheral side of the bushing body and/or on the outer peripheral side of the bushing body and/or on the inner peripheral side of the laminated rotor core, there is at least a zoned surface structure, which preferably has a plurality of radially extending elevations and/or depressions may have, is formed. This surface structure can particularly preferably be produced by means of knurling or laser irradiation. Said surface structure ensures an improved frictional connection between the respective two joining partners, whereby the maximum transmittable torque can be increased again compared to variants without such a surface structure.

In a further preferred embodiment, the sleeve-shaped socket body is designed in one piece. This variant is particularly simple and therefore inexpensive to produce. In addition, the risk of damage to the bushing body when joining the laminated rotor core is particularly greatly reduced in this embodiment if the bushing body is formed in one piece.

According to a further advantageous development, the laminated rotor core can include an axial stop for the axial positioning of the laminated rotor core relative to the bushing body.

The material of the socket body can particularly preferably be a non-ferromagnetic material. This prevents the bushing body from being able to negatively influence the course of the magnetic field lines of the alternating magnetic field that are present during operation of the rotor in an electrical machine.

According to a further advantageous development, in addition to the laminated rotor core, magnetic field generating elements connected to the socket body in a torque-proof manner are arranged on the socket body for generating a magnetic rotor field. Thus, when used in an electrical machine, the rotor can generate a magnetic rotor field which can interact magnetically with a magnetic stator field generated by the stator of the electrical machine in order in this way to drive the rotor.

Particularly expediently, the magnetic field generating elements can be or include permanent rotor magnets or rotor coils that can be electrically energized. Thus, the rotor according to the invention with the rotor shaft according to the invention can be used both in a separately excited electrical synchronous machine and in a permanent magnet excited synchronous machine.

The invention therefore also relates to an electrical machine with a stator for generating a magnetic stator magnetic field and with a rotor according to the invention, whose magnetic field generating elements are magnetically coupled to the stator magnetic field for driving the rotor shaft. The advantages of the rotor according to the invention explained above are therefore transferred to the electric machine according to the invention.

The machine can preferably be an externally excited electrical synchronous machine or a permanent magnet excited synchronous machine or an asynchronous machine, with the stator being a synchronous machine stator that can be electrically energized to generate a magnetic stator field.

The invention also relates to a method for producing a rotor according to the invention presented above. The advantages of the rotor according to the invention explained above are therefore also transferred to the method according to the invention.

The method according to the invention comprises four measures a) to d).

In measure a), a rotor shaft extending along an axial direction is provided.

In measure b) a sleeve-shaped socket body is provided. It goes without saying that measure a) can be carried out before measure b), or, alternatively, measure b) before measure a). It is also possible to carry out measures a) and b) at the same time.

In measure c), a laminated rotor core is provided from or with a plurality of rotor laminations stacked on top of one another and joined to an outer peripheral side of the bushing body, preferably in a non-positive manner or with play or in a materially bonded manner.

For this purpose, an outer diameter of the bushing body measured perpendicularly to the axial direction is larger or smaller than an inner diameter of the laminated rotor core, also measured perpendicularly to the axial direction, at least before joining by a predetermined second fit dimension. In the first case, a press fit can be created by joining, in the second case a clearance fit. Measure c) is expediently carried out after measure b) and can also—together with measure b)—be carried out either after measure a) or before measure a).

In a further measure d), which is carried out after measure c), the bushing body is joined with the laminated rotor core as a structural unit on an outer peripheral side of the rotor shaft. An outer diameter of the rotor shaft measured perpendicularly to the axial direction is larger by a predetermined first fitting dimension, at least before joining, than an inner diameter of the sleeve-shaped bushing body, also measured perpendicularly to the axial direction. This creates an interference fit between the bush body and the rotor shaft. If a clearance fit is created between the bushing body and the laminated rotor core in measure c), a frictional connection between the bushing body and the laminated rotor core can be achieved by joining the rotor shaft with the appropriate fit in the socket body.

Appropriately, the joining according to measure c) comprises an axial insertion of the socket body into an axially extending opening formed on the rotor laminated core, so that after insertion the outer peripheral side of the socket body rests against the inner peripheral side of the rotor laminated core.

In a further advantageous embodiment of the method according to the invention, the bushing body can also be joined with a so-called transition fit, ie a small positive or negative fit dimension, or in the laminated rotor core.

Further important features and advantages of the invention result from the dependent claims, from the drawing and from the associated description of the figures based on the drawing.

It goes without saying that the above and below still need to be explained the features can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

Preferred exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description, with the same reference symbols referring to identical or similar or functionally identical components.

The only 1 shows an example of a rotor 1 according to the invention for an electrical machine in a longitudinal section. The rotor 1 includes a rotor shaft 2 extending along an axial direction A and having an outer peripheral side 3. The material of the rotor shaft 2 may be metal. As shown, the rotor shaft 2 can be designed as a hollow shaft through which a cooling medium (not shown) can flow. 1 shows a longitudinal section of the rotor shaft 1 along the axial direction A. The central longitudinal axis M can be an axis of rotation D of the rotor shaft 2 or of the rotor 1. The rotor shaft 2 can be arranged axially between two output plugs or output flanges 11a, 11b.

According to 1 a radial direction R extends perpendicularly to the axial direction A away from the axis of rotation D or central longitudinal axis M. A circumferential direction U runs perpendicular to the axial direction A and also perpendicular to the radial direction R around the axis of rotation D or the central longitudinal axis M.

The rotor 1 comprises according to 1 a sleeve-shaped socket body 4 extending along the axial direction A. The material of the socket body 4 can be a non-ferromagnetic material. The sleeve-shaped bushing body 4 rests with an inner peripheral side 5 on the outer peripheral side 3 of the rotor shaft 2 .

In addition, the rotor 1 comprises a laminated rotor core 6 extending along the axial direction A. The laminated rotor core 6 is in turn formed by a plurality of rotor laminations 9 stacked on top of one another in the axial direction A. The material of the laminated rotor core 6 or the rotor laminations 9 can be a metal. An opening 10 extending along the axial direction A is formed in the laminated rotor core 6 or in the rotor laminations 9 to accommodate the bushing body 4 and the rotor shaft 2 .

How 1 further illustrated, the rotor laminated core 6 with the rotor laminations 9 is arranged radially on the outside on the socket body 4 so that the rotor laminated core 6 rests with an inner peripheral side 7 on an outer peripheral side 8 of the sleeve body 4 . The socket body 4 is connected to the rotor shaft 2 in a torque-proof manner by means of a non-positive connection. To form this non-positive connection between bushing body 4 and rotor shaft 2, an outer diameter d_a_RW of rotor shaft 2 measured perpendicular to axial direction A in radial direction R can be larger by a predetermined first fit dimension m1 than an outer diameter also perpendicular to axial direction A in radial direction R Measured inner diameter d_i_BK of the sleeve-shaped socket body 4.

Likewise, in the example scenario, the bushing body 4 is also connected in a torque-proof manner to the laminated rotor core 6 by means of a non-positive connection. As an alternative to this, however, an integral connection, for example in the form of a soldered connection, but also in the form of a welded connection, can also be considered here.

In both variants, an outer diameter d_a_BK of the bushing body 4 measured perpendicularly to the axial direction A between the bushing body 4 and the laminated rotor core 5 can be larger by a predetermined second fit dimension m2 than an inner diameter d_i_RBP of the laminated rotor core 6, also measured perpendicularly to the axial direction A. In both variants advantageously, the first dimension m1 is selected to be larger than the second dimension m2. Both the first and the second dimension m1, m2 can be between 5 μm and 200 μm. The sum S = m1 + m2 can also be between 5 µm and 200 µm.

in a 1 variant that is not shown, the sleeve-shaped bushing body 4 can have a through-slot extending along the axial direction A to form the non-positive connection, i.e. it can be designed to be open in a cross section perpendicular to the axial direction A and in this way be prestressed radially outwards against the laminated rotor core 6 be.

In a further variant, the bushing body 4 can also be joined into the laminated rotor core 6 without overlap with a so-called clearance fit, ie a negative fit dimension m2<0. In this variant, an outer diameter d_a_BK of the bushing body 4 measured perpendicularly to the axial direction A is smaller by a predetermined second fit dimension m2 than an inner diameter d_i_RBP of the laminated rotor core 6, also measured perpendicularly to the axial direction A. This variant is particularly useful if the bushing body 4 is integrally bonded to be connected to the rotor laminated core 6.

Optionally, an in 1 surface structure not shown in detail may be formed with a plurality of radially extending elevations and depressions. This surface structure can be produced by means of knurling or laser irradiation. How 1 can be seen, the sleeve-shaped socket body 4 can be formed in one piece. Alternatively, an in 1 not shown 2-part or multi-part design of the socket body 4.

Also optionally, the laminated rotor core 6 can include an axial stop (not shown) for axially positioning the laminated rotor core 6 relative to the bushing body 4 .

In addition to the laminated rotor core 6, a plurality of magnetic field generating elements for generating a magnetic rotor field can be arranged on the socket body 4. These magnetic field generating elements, like the laminated rotor core 6, are expediently connected to the socket body 4 in a rotationally fixed manner, in particular by means of a materially bonded or non-positive connection. Said magnetic field generating elements can be formed by rotor permanent magnets or by electrically energized rotor coils. The rotor can thus be used both in an externally excited electrical synchronous machine and in a permanent-magnet synchronous machine.

The method according to the invention for the production of the in 1 Rotor 1 shown as an example also explained by way of example. The method according to the invention comprises four measures a) to d). In measure a) of the method, the rotor shaft 2 extending along an axial direction A is provided. In measure b), the sleeve-shaped socket body 4 is provided.

In measure c), a laminated rotor core 6 with a plurality of rotor laminations 9 stacked on top of one another is provided. An outer diameter d_a_BK of the bushing body 4, measured perpendicularly to the axial direction A, is larger at least before joining by a predetermined second fit dimension m2 than an inner diameter d_i_RBP of the laminated rotor core 6, also measured perpendicularly to the axial direction A. In this way, between the laminated rotor core 6 and the Socket body 4 creates a press fit and thus a non-positive and non-rotatable connection.

The first fit m1 is expediently selected to be larger than the second fit m2. As a result, damage to the sensitive laminated rotor core 6 with the rotor laminations 9 can at least be counteracted.

In the example scenario, the joining according to measure c) includes an axial insertion of the bushing body 4 into the opening 10 formed in the rotor laminated core 6 or in the rotor laminations 9 and extending along the axial direction A. The insertion takes place in such a way that after the insertion the outer peripheral side 8 of the bushing body 4 rests against the inner peripheral side 7 of the laminated core 6 of the rotor.

In measure d), the bushing body 4 is joined to the laminated rotor core 6 on an outer peripheral side 3 of the rotor shaft 2 and the rotor according to the invention is completed in this way. An outer diameter d_a_RW of the rotor shaft 2 measured perpendicularly to the axial direction A is larger by a predetermined first fit dimension m1 than an inner diameter d_i_BK of the sleeve-shaped bushing body 4, also measured perpendicularly to the axial direction A. In this way, there is a press fit between the bushing body 4 and the rotor shaft 2 and thus creates a non-positive, non-rotatable connection.

In a variant of the example, a clearance fit can also be produced between the bushing body and the laminated rotor core 4 in measure c). For this purpose, the outer diameter d_a_BK of the bushing body 4 is defined such that it is smaller than the inner diameter of the laminated rotor core 6, at least before joining. In this case, the second fit dimension m2 is negative, i.e. m2 <0. In this variant, the first fit dimension m1 can be designed such that when the rotor shaft 2 is subsequently joined to the bushing body 4, the bushing body 4 is expanded radially outwards, so that a non-positive and therefore non-rotatable connection of the bushing body 4 to the rotor laminated core 6 is also realized. The actual non-positive connection between the two joining partners is only achieved here by joining the rotor shaft 6 with the corresponding fit dimension m1 in the bushing body 4. However, it is also conceivable to connect the bushing body 4 to the laminated rotor core 6 in a rotationally fixed manner by means of a materially bonded connection.

The invention relates to a rotor (1) for an electrical machine. The rotor (1) comprises a rotor shaft (2) extending along an axial direction (A) and having an outer peripheral side (3). Furthermore, the rotor (1) comprises a sleeve-shaped bushing body (4) which extends along the axial direction (A) and is arranged radially on the outside on the rotor shaft (2). Besides that the rotor (1) comprises a hollow-cylindrical laminated rotor core (6) extending along the axial direction (A). In addition, the laminated rotor core (6) is arranged radially on the outside of the bushing body (4). An outer diameter (d_a_RW) of the rotor shaft (2), measured perpendicularly to the axial direction (A), is advantageously designed with a larger overlap value by a predetermined first fit dimension (m1) than an inner diameter (d_i_BK), also measured perpendicularly to the axial direction (A), of the sleeve-shaped socket body (4). Furthermore, an outer diameter (d_a_BK) of the bushing body (4) measured perpendicularly to the axial direction (A) has a larger overlap value by a predetermined second fit dimension (m2) than an inner diameter (d_i_RBP) of the laminated rotor core, also measured perpendicularly to the axial direction (A). (6). According to the invention, the excess of the first fit (m1) is greater than the excess of the second fit (m2).

Claims (18)

Rotor (1) for an electrical machine, - having a rotor shaft (2) extending along an axial direction (A) and having an outer peripheral side (3), - With a sleeve-shaped bushing body (4) which extends along the axial direction (A) and is arranged radially on the outside of the rotor shaft (2), so that the bushing body (4) has an inner peripheral side (5) on the outer peripheral side (3) against the rotor shaft (2), - the rotor shaft (2) being non-positively and non-rotatably connected to the bush body (4) by means of a press fit. rotor after claim 1 , characterized in that to form the press fit, an outer diameter (d_a_RW) of the rotor shaft (2) measured perpendicular to the axial direction (A) is larger by a predetermined first fit dimension (m1) than an inner diameter ( also measured perpendicular to the axial direction (A) d_i_BK) of the sleeve-shaped socket body (4). rotor after claim 1 or 2 , characterized in that - the bushing body (4) is non-positively and non-rotatably connected to the rotor laminated core (6) by means of a press fit, - an outer diameter (d_a_BK) of the bushing body (4) measured perpendicularly to the axial direction (A) to form the press fit a predetermined second fit dimension (m2) is greater than an inside diameter (d_i_RBP) of the laminated rotor core (6), also measured perpendicularly to the axial direction (A). - Preferably, the first fit (m1) is greater than the second fit (m2). rotor after claim 3 , characterized in that at least the sum (S=m1+m2) of the two fitting dimensions (m1, m2) is between 5 µm and 200 µm. Rotor according to one of the preceding claims, characterized in that the sleeve-shaped bushing body (4) is pretensioned radially outwards against the rotor core (6) to form the non-positive connection with the rotor core (6), in particular by means of an axial through-slot. Rotor according to one of the preceding claims, characterized in that the bushing body (4) is non-rotatably connected to the laminated rotor core (6) by means of an integral connection, in particular by means of a soldered connection. Rotor according to one of the preceding claims, characterized in that to form a loose fit, an outer diameter (d_a_BK) of the bushing body (4) measured perpendicularly to the axial direction (A) is smaller by a predetermined second fit dimension (m2) than one also perpendicular to the axial direction (A) Measured inner diameter (d_i_RBP) of the rotor core (6). Rotor according to one of the preceding claims, characterized in that on the outer peripheral side (3) of the rotor shaft (2) and/or on the inner peripheral side (5) of the bushing body (4) and/or on the outer peripheral side (8) of the bushing body (4) or/and a surface structure, preferably produced by means of knurling or laser irradiation, which preferably has a plurality of radially extending elevations and/or depressions, is formed on the inner peripheral side (7) of the rotor laminated core (6). Rotor according to one of the preceding claims, characterized in that the sleeve-shaped bush body (4) is constructed in one piece. Rotor according to one of the preceding claims, characterized in that the laminated rotor core (6) comprises an axial stop for the axial positioning of the laminated rotor core (6) relative to the bushing body (4). Rotor according to one of the preceding claims, characterized in that the material of the bush body (4) is non-ferromagnetic. Rotor according to one of the preceding claims, characterized in that magnetic field generating elements non-rotatably connected to the bushing body (4) for generating a magnetic rotor field are arranged on the bushing body (4) in addition to the rotor laminated core (6). rotor after claim 12 , characterized in that the magnetic field generating elements are either rotor permanent magnets or electrically energizable rotor coils or include. Electrical machine, - with a stator for generating a magnetic stator magnetic field, - with a rotor (1). claim 12 or 13 , whose magnetic field generating elements for driving the rotor shaft (2) are magnetically coupled to the stator magnetic field. Electric machine after Claim 14 , characterized in that - the machine is an externally excited electrical synchronous machine or a permanent magnet excited synchronous machine or an asynchronous machine, - the stator is an electrically energizable synchronous machine stator for generating a magnetic stator field. Method for manufacturing a rotor according to one of Claims 1 until 13 , comprising the following measures: a) providing a rotor shaft (2) extending along an axial direction (A), b) providing a sleeve-shaped bushing body (4), c) joining a laminated rotor core (6) from or with a plurality of rotor laminations ( 9) on an outer peripheral side (8) of the socket body (4), wherein an outside diameter (d_a_BK) of the socket body (4) provided in measure b) measured perpendicularly to the axial direction (A) is increased by a predetermined second fitting dimension (m2) at least before joining is larger or smaller than an inner diameter (d_i_RBP) of the laminated rotor core (6), also measured perpendicularly to the axial direction (A), d) non-rotatable and non-positive joining of the bushing body (4) to the laminated rotor core (6) on an outer peripheral side (3) of the rotor shaft (2), wherein an outer diameter (d_a_RW), measured perpendicularly to the axial direction (A), of the rotor shaft (2) provided in measure a) is larger by a predetermined first fitting dimension (m1), at least before joining, than an outer diameter (d_a_RW) also perpendicular to the axial direction ( A) Measured inner diameter (d_i_BK) of the sleeve-shaped socket body (4) in measure b). procedure after Claim 16 , characterized in that the joining according to measure d) also creates a non-rotatable, in particular non-positive connection between the bushing body (4) and the laminated rotor core (6), in particular if this has not already happened in measure c). procedure after Claim 16 or 17 , characterized in that in measure c) the joining comprises an axial insertion of the bushing body (4) into an axially extending opening (10) formed on the rotor laminated core (6), so that after the insertion the outer peripheral side (8) of the bushing body ( 4) rests against the inner peripheral side (7) of the laminated rotor core (6).

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