Method for winding a magnet unit of a rotor of an electric machine, and clamping assembly

Abstract

The invention relates to a method, preferably for winding a magnet unit of a rotor of an electric machine, comprising a provision step, in which a rotor shaft (5) fitted with a magnet unit and belonging to a rotor is provided, and a winding step, in which the magnet unit is wound with a winding wire (27). According to the invention, a lamination-stack clamping step is provided, which temporally precedes the winding step and in which a lamination-stack clamping force (FBP) is applied to a lamination stack (9) of the magnet unit by means of a clamping tool (3).

Description

[0001] Method for winding a magnet unit of a rotor of an electric machine and a clamping arrangement

[0002] DESCRIPTION:

[0003] The invention relates to a method for winding a magnet unit of a rotor according to the preamble of claim 1 and a clamping arrangement according to claim 9.

[0004] In a generic method for winding a magnet unit of a rotor of an electric machine, a rotor shaft equipped with a magnet unit is first provided in a preparation step. The magnet unit comprises a laminated core formed by a stack of several electrical sheets and two star disks. One of the star disks is arranged on each end face of the laminated core. During winding of the magnet unit, a winding wire is wound in several turns around the magnet unit or around a winding pole of the magnet unit under the influence of a winding tension force.

[0005] Due to shape tolerances and / or burrs on the individual electrical sheets, the electrical sheets do not fit together perfectly before winding, and air gaps exist between the electrical sheets. Under the influence of the winding tension force applied to the winding wire, settling effects occur in the laminated core, so that the winding wire, which was originally wound onto the magnet unit under the influence of the winding tension force, loosens. The loosened winding wire prevents the correct placement of additional turns on previously wound turns. Due to the incorrect placement of the additional turns, the achievable copper fill level of the rotor decreases, and thus the efficiency of the electrical machine in which the rotor is used. DE 38 29 068 C1 discloses a method and a device for bonding punched electrical sheets.

[0006] The object of the invention is to provide a method for winding a magnet unit of a rotor of an electric machine, which allows a rotor with a higher copper fill level to be produced compared to known methods. A further object is to provide a clamping arrangement for winding a magnet unit of a rotor of an electric machine, which allows a rotor with a higher copper fill level to be produced compared to known rotors.

[0007] This object is achieved by the features of the independent claims. Preferred developments of the invention are disclosed in the subclaims.

[0008] According to the invention, a method, preferably a method for winding a magnet unit of a rotor of an electric machine, is proposed, which comprises a provision step in which a rotor shaft of a rotor equipped with a magnet unit is provided. The method comprises a winding step in which the magnet unit, preferably a first of several winding poles of the magnet unit, is wound with a winding wire. In order to achieve a high copper fill level of the wound rotor, the invention provides a laminated core clamping step which precedes the winding step and in which a laminated core clamping force is applied to a laminated core of the magnet unit by means of a clamping tool. The laminated core clamping force ensures that there are no longer any air gaps in the laminated core that could lead to subsequent loosening of the windings on the magnet unit.

[0009] The rotor can preferably be formed by a drum armature with a plurality of winding poles (winding poles can also be referred to as rotor poles). In a specific embodiment of the method, during the laminated core clamping step, the clamping tool can be applied to a first laminated core segment of preferably a plurality of laminated core segments of the laminated core. The clamping tool can preferably be applied such that the clamping tool is applied to the laminated core segment from the radial outside with respect to the longitudinal axis of the rotor shaft. Preferably, it can be provided that during the laminated core clamping step, a first laminated core adjusting device and / or a second laminated core adjusting device of the clamping tool applied to the laminated core is actuated and the clamping tool is clamped to the first laminated core segment while building up a laminated core clamping force.The clamping tool is thus applied independently of the actual clamping of the clamping tool to the first laminated core segment. The clamping tool is applied more easily because the clamping tool can be applied to the first laminated core segment without the influence of the laminated core clamping force.

[0010] In an exemplary embodiment of the method, the laminated core can be formed by a stack of electrical laminations. During the laminated core clamping step, the electrical laminations, preferably all electrical laminations of the laminated core, are pressed together in the region of the first laminated core segment under the action of the laminated core clamping force between, preferably, a laminated core projection, a first laminated core clamping jaw of the clamping tool, and, preferably, a laminated core projection, a second laminated core clamping jaw of the clamping tool, preferably under the action of the laminated core clamping force. The electrical laminations can lie directly against one another under the action of the laminated core clamping force.During the laminated core clamping step, this ensures that the individual electrical laminations are actually pressed together, eliminating any air gaps between the electrical laminations that could cause the winding wire or windings of the winding wire to loosen during the winding step. Particularly preferably, the laminated core clamping force can remain applied throughout the entire winding step of the first laminated core segment.

[0011] Alternatively or additionally, the laminated core clamping force can be applied, preferably completely, at the beginning of the winding step and maintained for at least a predefined laminated core clamping duration during the winding step.

[0012] Preferably, the force vectors of the laminated core clamping force can extend substantially parallel to the longitudinal axis of the rotor shaft.

[0013] In a preferred embodiment, the magnet unit can comprise the laminated core and a first star disk and / or a second star disk. Using the star disks allows the rotor to be wound with the winding wire without kinking, since sharp edges on the laminated core are covered by the star disks. The winding wire can be formed from an electrically insulated wire, preferably a copper enameled wire.

[0014] In a particularly preferred embodiment of the method, a star disk clamping step can be provided, in which the first star disk and / or the second star disk is pressed against the laminated core by means of the clamping tool. This additionally ensures that there is no air gap between the laminated core and one of the star disks, which could cause subsequent loosening of the already wound winding wire during the winding step. Preferably, it can be provided that the star disk clamping step follows the laminated core clamping step and is preferably already completed at the start of the star disk clamping step, and / or that the star disk clamping step precedes the winding step and is preferably already completed at the start of the winding step.The fact that the star disk clamping step follows the laminated core clamping step results in the following advantage: The laminated core is already free of air gaps at the start of the star disk clamping step. This means that no additional clamping force needs to be applied to the laminated core via the star disks to remove air gaps from the laminated core. Because the clamping is completely independent of the clamping of the laminated core and the clamping of the star disks, it is also possible to clamp only the laminated core using the clamping tool before the winding step and to clamp the star disks against the laminated core without the clamping tool and exclusively using the winding wire. The star disk clamping step is therefore merely optional, and the star disk clamping step can be omitted if necessary.

[0015] In a specific embodiment of the method, during the star disk clamping step, a first star disk adjusting device of the clamping tool can be actuated such that a first star disk segment of the first star disk is clamped against the first laminated core segment, preferably against a first electrical sheet of the laminated core, by means of a first star disk clamping jaw of the clamping tool, preferably while building up a first star disk clamping force. By means of the first star disk adjusting device, it is possible to apply the level of the first star disk clamping force in a precisely metered manner. This ensures that, on the one hand, there is no air gap between the first star disk segment of the first star disk and the laminated core, and, on the other hand, that the first star disk, which may be made of plastic, for example, is not damaged.

[0016] In an exemplary embodiment of the method, during the star disk clamping step, a second star disk adjusting device of the clamping tool can be actuated such that a first star disk segment of the second star disk is clamped against the first laminated core segment, preferably against a second electrical sheet of the laminated core, by means of a second star disk clamping jaw of the clamping tool, preferably while building up a second star disk clamping force. By means of the second star disk adjusting device, it is possible to apply the level of the second star disk clamping force in a precisely metered manner. This ensures that, on the one hand, there is no air gap between the first star disk segment of the second star disk and the laminated core, and, on the other hand, that the second star disk, which may be made of plastic, for example, is not damaged.

[0017] The first star disk segment of the first star disk or all star disk segments of the first star disk can be made of the same material and / or be an integral part of the first star disk. The first star disk segment of the second star disk or all star disk segments of the second star disk can be made of the same material and / or be an integral part of the second star disk.

[0018] The first electrical sheet can form a first end face of the laminated core. The second electrical sheet can form a second end face of the laminated core, opposite the first end face.

[0019] Preferably, the force vectors of the first star disk clamping force and / or the second star disk clamping force can extend substantially parallel to the longitudinal axis of the rotor shaft.

[0020] Preferably, the first star disk tension force and / or the second star disk tension force can remain applied throughout the entire winding step of the first winding pole. The first winding pole can be formed by the first star disk segment of the first star disk, the first laminated core segment, and the first star disk segment of the second star disk. Alternatively or additionally, the first star disk tension force and / or the second star disk tension force can be applied at the beginning of the winding step, preferably completely, and can remain applied for at least a predefined star disk tension duration during the winding step.

[0021] In a specific embodiment of the method, the first star disk segment of the first star disk, the first laminated core segment, and the first star disk segment of the second star disk can together form the first winding pole of several winding poles of the rotor or the magnet unit and / or can be aligned with one another, viewed parallel to the longitudinal axis of the rotor. In the winding step, the first winding pole can be wound with the winding wire. During the winding step, a winding tension force can be applied to the winding wire, wherein it is preferably provided that the winding wire is wound onto the winding pole under the influence of the winding tension force.

[0022] The method can preferably include a release step which follows the winding step and during which the clamping tool is released from the first laminated core segment as well as the first star disk segment of the first star disk and the first star disk segment of the second star disk, preferably while reducing the clamping forces. The winding step of the first winding pole can already be completed when the release step begins. Particularly preferably, the release step can be carried out before the winding step of the first winding pole is completed, since there is no longer any risk of the winding wire loosening towards the end of the winding step. The clamping tool can thus be clamped to another winding pole before the winding step is completed, advantageously reducing the overall process time for winding the magnet unit.

[0023] In one embodiment, which is merely exemplary, the clamping tool can remain on the magnet unit, preferably on the first winding pole, after the winding step. The provision of a release step can then be omitted.

[0024] Preferably, the magnet unit can comprise the laminated core as well as the first star disk and the second star disk. The first star disk, the laminated core and the second star disk can be arranged one behind the other or stacked one behind the other, preferably viewed along the longitudinal axis of the rotor shaft. The laminated core can be arranged between the first star disk and the second star disk. Preferably, the first laminated core segment can be arranged together with further

[0025] Laminated core segments of the laminated core must be evenly distributed in the circumferential direction around the longitudinal axis of the rotor shaft.

[0026] Particularly preferably, the first star disk can have a plurality of star disk segments, wherein it can preferably be provided that the star disk segments of the first star disk are arranged uniformly distributed in the circumferential direction around a longitudinal axis of the rotor shaft.

[0027] Likewise, the second star disk can have a plurality of star disk segments, wherein it can preferably be provided that the star disk segments of the second star disk are arranged uniformly distributed in the circumferential direction around a longitudinal axis of the rotor shaft.

[0028] For example, each of the star disk segments can be aligned with one of the laminated core segments, preferably viewed parallel to a longitudinal axis of the rotor shaft.

[0029] Preferably, the electrical sheets can be substantially star-shaped. It can preferably be provided that the electrical sheets are stacked one behind the other, preferably along the longitudinal axis of the rotor shaft. Preferably, at least one of the plurality of electrical sheets can be formed from an iron sheet. Also, several or all of the plurality of electrical sheets can each be formed from an iron sheet.

[0030] In a preferred embodiment of the method, in the laminated core clamping step, a clamping tool can first be applied to the first winding pole or to several winding poles. The winding poles can then be wound with the winding wire in the winding step. Thus, for example, all winding poles of the rotor can first be provided with a clamping tool each and only then can the winding step be carried out. The laminated core clamping force and / or the star disk clamping forces can be applied to each winding pole by means of the clamping tools. Also according to the invention is a clamping arrangement, preferably for winding a magnet unit of a rotor of an electric machine, preferably using a method as described above. The clamping arrangement has a rotor of an electric machine and a clamping tool, preferably as described above.The rotor has a rotor shaft equipped with a magnet unit and the clamping tool is clamped to the magnet unit.

[0031] The clamping tool of the clamping arrangement described above is also according to the invention.

[0032] The clamping tool can preferably comprise a first laminated core clamping jaw, a clamping tool center part, and a second laminated core clamping jaw. The first laminated core clamping jaw and the clamping tool center part can be separate components and / or connected to one another via a first laminated core adjustment device, wherein it can preferably be provided that the first laminated core adjustment device can be actuated mechanically, hydraulically, and / or pneumatically. For example, the first laminated core adjustment device can generally be formed by any adjustment device that enables a, preferably defined, relative movement between the first laminated core clamping jaw and the clamping tool center part.

[0033] The first laminated core adjusting device can preferably be designed such that, by actuating the first laminated core adjusting device, the first laminated core clamping jaw and the clamping tool center part are moved towards or away from each other, preferably parallel to a longitudinal axis of the clamping tool. Actuating the first laminated core adjusting device can also be understood as moving the first laminated core clamping jaw and the clamping tool center part apart or towards each other, in which the first laminated core adjusting device is integrated, loaded, or participates. The first laminated core adjusting device can be formed at least partially and merely by way of example by an adjusting screw or by a first spring element. By way of example, the first spring element can be formed by a meander-shaped spring element.The first laminated core adjustment unit, preferably formed by the first spring element, can be actuated, for example, by a robot, preferably a manipulator of the robot. Specifically, the robot can move the first laminated core clamping jaw and the clamping tool center part away from each other, building up a spring force. Subsequently, the first laminated core clamping jaw and the clamping tool center part can move toward each other, preferably automatically, while the spring force is released.

[0034] Preferably, the clamping tool can have a second laminated core adjustment device, wherein it is preferably provided that the second laminated core adjustment device can be actuated mechanically, hydraulically, and / or pneumatically. The clamping tool center part and the second laminated core clamping jaw can be connected to one another via the second laminated core adjustment device.

[0035] For example, the second laminated core adjusting device can be designed such that, by actuating the second laminated core adjusting device, the clamping tool center part and the second laminated core clamping jaw are moved toward or away from each other, preferably parallel to a longitudinal axis of the clamping tool. For example, the second laminated core adjusting device can generally be formed by any adjusting device that enables a, preferably defined, relative movement between the second laminated core clamping jaw and the clamping tool center part. Actuating the second laminated core adjusting device can also be understood as moving the clamping tool center part and the second laminated core clamping jaw apart or towards each other, in which the second laminated core adjusting device is integrated, loaded, or participates.The second laminated core adjustment device can be formed at least partially and merely by way of example by an adjusting screw or by a second spring element. For example, the second spring element can be formed by a meander-shaped spring element. The second laminated core adjustment unit, which is preferably formed by the second spring element, can be actuated, for example, by means of a robot, preferably a manipulator of the robot. Specifically, the robot can move the second laminated core clamping jaw and the clamping tool center part, in particular away from one another, while building up a spring force. Subsequently, the second laminated core clamping jaw and the clamping tool center part can move towards one another, preferably automatically, while dissipating the spring force.

[0036] For example, the clamping tool center section and the second sheet stack clamping jaw can be formed as a single piece and / or made of the same material. In this case, the second sheet stack adjustment device can advantageously be omitted.

[0037] Preferably, the clamping tool can have a first star disk clamping jaw and / or a second star disk clamping jaw. Thus, the clamping tool can be used to clamp not only the laminated core, but also the star disks toward the laminated core.

[0038] The clamping tool can preferably have a first star disk adjustment device, wherein it can preferably be provided that the first star disk clamping jaw and the first laminated core clamping jaw are connected to one another via the first star disk adjustment device. For example, the first star disk adjustment device can generally be formed by any adjustment device that enables a, preferably defined, relative movement between the first star disk clamping jaw and the first laminated core clamping jaw. The first star disk adjustment device can be formed, at least partially and merely by way of example, by an adjusting screw.

[0039] For example, the first star-disk adjustment device can be designed such that, by actuating the first star-disk adjustment device, the first star-disk clamping jaw and the first laminated core clamping jaw are moved toward or away from each other. Actuating the first star-disk adjustment device can also be understood as moving the first star-disk clamping jaw and the first laminated core clamping jaw apart or toward each other, in which the first star-disk adjustment device is integrated, loaded, or participates.

[0040] Specifically, the clamping tool can have a second star disk adjustment device, wherein it can preferably be provided that the second star disk clamping jaw and the second laminated core clamping jaw are connected to one another via the second star disk adjustment device. For example, the second star disk adjustment device can generally be formed by any adjustment device that enables a, preferably defined, relative movement between the second star disk clamping jaw and the second laminated core clamping jaw. The second star disk adjustment device can be formed, at least partially and merely by way of example, by an adjusting screw.

[0041] For example, the second star-disk adjustment device can be designed such that, by actuating the second star-disk adjustment device, the second star-disk clamping jaw and the second laminated core clamping jaw are moved toward or away from each other. Actuating the second star-disk adjustment device can also be understood as moving the second star-disk clamping jaw and the second laminated core clamping jaw apart or toward each other, in which the second star-disk adjustment device is integrated, loaded, or participates.

[0042] Preferably, the clamping tool or several clamping tools can be part of a production line for winding a magnet unit of a rotor of an electric machine, for example. The clamping tool or tools can then be fully automatically mounted on the winding pole(s) to be wound by the production line and also removed from the wound winding pole(s). Alternatively, the clamping tool or tools can be separate assemblies from the production line, which are, for example, manually attached to the winding pole(s) by a worker, with the winding pole(s) then being wound in the production line, preferably simultaneously or sequentially.

[0043] Embodiments of the invention are explained in more detail below with reference to the attached schematic drawing.

[0044] They show:

[0045] Fig. 1 shows a clamping arrangement comprising a rotor of an electric machine shown in a partial view and a clamping tool shown in a side view;

[0046] Fig. 2 to 6 each show a partial view of a rotor shaft of the rotor according to Figure 1 with a magnet unit shown in a side sectional view after different process steps;

[0047] Fig. 7 shows a schematic representation of windings of a winding wire in an orthocyclic arrangement, and

[0048] Fig. 8 shows a partial view of the rotor shaft of the rotor with the fully wound magnet unit shown in a side sectional view.

[0049] Figure 1 shows a clamping arrangement 1. The clamping arrangement 1 has a rotationally symmetrical rotor of an electric machine, of which only the upper half – i.e. a partial view – is shown for the sake of clarity. The clamping arrangement 1 also has a clamping tool 3 that is clamped firmly to the rotor. The rotor has a rotor shaft 5 that is equipped with a magnet unit. The magnet unit is formed by a laminated core 9 and by a first star disk 11 and a second star disk 13. The laminated core 9 is arranged between the first star disk 11 and the second star disk 13. In Figure 1, a first winding pole 25 (see Figure 2) of the magnet unit is already wound with a winding wire 27 (see Figure 8).In addition, the clamping tool 3 is clamped to the first winding pole 25 in such a way that all electrical sheets of the laminated core 9 as well as the first star disk 11 and the second star disk 13 lie against one another without an air gap, at least in the area of ​​the first winding pole 25.

[0050] Figure 2 initially shows the state after completion of a preparation step of a method for winding the magnet unit, in which the rotor shaft 5 equipped with the magnet unit is prepared. The laminated core 9 is formed by several star-disk-shaped electrical laminations stamped from iron sheet (indicated by the vertical hatching), which are stacked one behind the other along the longitudinal axis A of the rotor. A first electrical lamination 15 is arranged at a first end of the laminated core 9, and a second electrical lamination 17 is arranged at a second end of the laminated core 9, opposite the first end.

[0051] A first star disk segment 19 of several star disk segments of the first star disk 11, a first laminated core segment 21 of several laminated core segments of the laminated core 9, and a first star disk segment 23 of several star disk segments of the second star disk 13 together form the first winding pole 25 of several winding poles of the magnet unit. The first winding pole 25 is wound with a winding wire 27 in a winding step explained in detail later.

[0052] According to Figures 3 and 4, after completion of the preparation step, in a subsequent laminated core clamping step, the clamping tool 3 is placed onto the first winding pole 25 (see Figure 3) and clamped firmly to the first laminated core segment 21 (see Figure 4). The clamping tool 3 has a clamping tool center part 31 as well as a first laminated core clamping jaw 33 and a second laminated core clamping jaw 35, each provided with a laminated core projection. The first laminated core clamping jaw 33 is adjustably mounted on the clamping tool center part 31 by means of a first laminated core adjusting device, which is formed at least in part by an adjusting screw 37 (indicated by the dashed line at 37). The second sheet stack clamping jaw 35 is adjustably mounted on the clamping tool middle part 31 by means of a second sheet stack adjusting device, which is formed at least in part by an adjusting screw 39 (indicated by a dashed line at 39).

[0053] During the laminated core clamping step, the clamping tool 3 is first placed on the first winding pole 25 such that the first laminated core segment 21 is arranged between the two laminated core projections. The adjusting screws 37, 39 are then actuated such that the two laminated core projections move towards one another parallel to the longitudinal axis A of the rotor shaft 5. The electrical laminations of the laminated core 9 are thereby pressed together in the region of the first winding pole 25 under the action of a laminated core clamping force FBP applied by the clamping tool 3. The force vectors 41, 43 of the laminated core clamping force FBP lie on an axis extending parallel to the longitudinal axis A of the rotor shaft 5. There are now no longer any air gaps between the electrical laminations of the laminated core 9, and the electrical laminations lie perfectly against one another. The state of the clamping tool 3 after the laminated core clamping step has been carried out is shown in Figure 4.

[0054] In order to position the first star disk 11 and the second star disk 13 on the laminated core 9 without an air gap prior to the winding step, a star disk clamping step is provided. The star disk clamping step follows the laminated core clamping step and precedes the winding step. The state of the clamping tool 3 after the star disk clamping step is shown in Figure 5.

[0055] To perform the star disk clamping step, the clamping tool 3 has a first star disk clamping jaw 45 and a second star disk clamping jaw 47. The first star disk clamping jaw 45 and the first sheet stack clamping jaw 33 are connected to one another via a first star disk adjustment device, which is formed at least in part by an adjusting screw 49 (indicated by the dashed line at 49).

[0056] By actuating the adjusting screw 49, the first star disk clamping jaw 45 is adjusted parallel to the longitudinal axis A of the rotor shaft 5 relative to the first laminated core clamping jaw 33 and in the direction of the laminated core 9. The first star disk segment 19 of the first star disk 11 is pressed against the first electrical sheet 15 without an air gap, specifically under the influence of a first star disk clamping force Fs,i.

[0057] The second star disk clamping jaw 47 and the second sheet stack clamping jaw 35 are connected to one another via a second star disk adjusting device, which is formed at least in part by an adjusting screw 51 (indicated by the dashed line at 51).

[0058] By actuating the adjusting screw 51, the second star disk clamping jaw 47 is adjusted parallel to the longitudinal axis A of the rotor shaft 5 relative to the second laminated core clamping jaw 35 and in the direction of the laminated core 9. In doing so, the first star disk segment 23 of the second star disk 13 is pressed against the second electrical sheet 17 without an air gap, specifically under the action of a second star disk clamping force Fs,2. The force vector 53 of the first star disk clamping force Fs,i, as well as the force vector 55 of the second star disk clamping force Fs,2, lies on an axis extending parallel to the longitudinal axis A of the rotor shaft 5.

[0059] In the state of the clamping tool 3 according to Figure 5, the first star disk segment 19 of the first star disk 11 is clamped between the first star disk clamping jaw 45 and the first electrical sheet 15. The first star disk segment 23 of the second star disk 13 is clamped between the second star disk clamping jaw 47 and the second electrical sheet 17.

[0060] The first star disk 11 and the second star disk 13 are each made of plastic. The magnitude of the first star disk clamping force Fs,i is approximately equal to the magnitude of the second star disk clamping force Fs,2. Because the star disks 11 and 13 are made of plastic and are therefore susceptible to breakage, both the magnitude of the first star disk clamping force Fs,i and the magnitude of the second star disk clamping force Fs,2 are each considerably smaller than the magnitude of the laminated core clamping force FBP.

[0061] The clamping forces, i.e. the first star disk clamping force Fs,i , the second star disk clamping force Fs,2 and the laminated core clamping force FBP, are maintained for the duration of the winding step following the star disk clamping step.

[0062] During the winding step, the first winding pole 25 is wound with the winding wire 27 formed by a copper enamel wire, wherein the winding wire is wound in several turns 57 under the action of a winding tension force on the first winding pole 25 and to form part of an armature winding. The state of the rotor after the winding step has been completed is shown in Figure 6. The sum of the magnitudes of the tension forces, i.e. the first star disk tension force Fs,i , the second star disk tension force Fs,2 and the laminated core tension force FBP, is equal to or greater than an amount of a tension force that acts on the first winding pole 25 as a result of the winding wire 27 being wound onto the first winding pole 25 with the winding tension force.

[0063] The windings 57 are arranged orthocyclically to each other. The orthocyclic arrangement is schematically illustrated in Figure 7. Figure 7 shows that the windings 57 have the highest packing density in an orthocyclic arrangement, thus enabling the maximum possible copper filling ratio of the rotor.

[0064] Following the winding step, a release step is performed in which the adjusting screws 37, 39, 49, and 51 of the adjustment devices—that is, the first laminated core adjustment device, the second laminated core adjustment device, the first star-disk adjustment device, and the second star-disk adjustment device—are actuated in such a way that the clamping forces applied by the clamping tool 3 to the first winding pole 25 are reduced. The clamping tool 3 is then removed from the first winding pole 25. The state of the rotor with the wound magnet unit and the clamping tool 3 removed is shown in Figure 8.

[0065] According to the method for winding the first winding pole 15 explained above, the method is carried out several times in succession or with temporal overlaps, until all winding poles of the magnet unit or the rotor are wound with the winding wire.

[0066] In the method described above, which is merely an example, the clamping tool 3 is manually mounted on the winding pole to be wound before winding each of the rotor's winding poles and manually removed again after winding. However, the clamping tool 3 can also, for example, be part of a production line for winding a magnet unit of a rotor of an electric machine. The clamping tool 3 is then fully automatically mounted on the winding pole(s) to be wound by the production line and also removed again.

[0067] LIST OF REFERENCE SYMBOLS:

[0068] I Clamping arrangement

[0069] 3 clamping tool

[0070] 5 Rotor shaft

[0071] 9 sheet package

[0072] II first star disc

[0073] 13 second star disc

[0074] 15 first electrical sheet

[0075] 17 second electrical sheet

[0076] 19 first star disc segment of the first star disc

[0077] 21 first laminated core segment

[0078] 23 first star disc segment of the second star disc

[0079] 25 first winding pole

[0080] 27 winding wire

[0081] 29 additional winding pole

[0082] 31 Clamping tool middle part

[0083] 33 first sheet package clamping jaw

[0084] 35 second sheet package clamping jaw

[0085] 37, 39 Adjusting screw

[0086] 41 , 43 Force vector of the laminated core clamping force

[0087] 45 first star disk clamping jaw

[0088] 47 second star disk clamping jaw

[0089] 49, 51 Adjusting screw

[0090] 53, 55 force vector

[0091] 57 turns

[0092] A Longitudinal axis of the rotor shaft

[0093] FBP laminated core clamping force

[0094] Fs,i first star disk clamping force

[0095] Fs, 2 second star disk clamping force

Claims

PATENT CLAIMS:

1. Method, preferably for winding a magnet unit of a rotor of an electric machine, comprising: a provision step in which a rotor shaft (5) of a rotor equipped with a magnet unit is provided, a winding step in which the magnet unit is wound with a winding wire (27), characterized in that a laminated core clamping step is provided which precedes the winding step and in which a laminated core clamping force (FBP) is applied to a laminated core (9) of the magnet unit by means of a clamping tool (3).

2. Method according to claim 1, characterized in that in the laminated core clamping step the clamping tool (3) is applied to a first laminated core segment (21) of the laminated core (9), wherein it is preferably provided that in the laminated core clamping step, a first laminated core adjusting device and / or a second laminated core adjusting device of the clamping tool (3) applied to the laminated core (9) is actuated and the clamping tool (3) is clamped to the laminated core segment (9) while building up the laminated core clamping force (FBP).

3. Method according to claim 2, characterized in that the laminated core (9) is formed by a stack of electrical sheets, and that in the laminated core clamping step, the electrical sheets in the region of the first laminated core segment (21) are clamped under the action of the laminated core clamping force (FBP) between, preferably a laminated core projection, a first laminated core clamping jaw (33) of the clamping tool (3) and, preferably a laminated core projection, a second laminated core clamping jaw (35) of the clamping tool (3). Method according to one of the preceding claims, characterized in that the magnet unit has the laminated core (9) and a first star disk (11) and / or a second star disk (13). Method according to claim 4, characterized in that a star disk clamping step is provided in which the first star disk (11) and / or the second star disk (13) is pressed against the laminated core (9) by means of the clamping tool (3), wherein it is preferably provided that the star disk clamping step follows the laminated core clamping step and / or that the star disk clamping step precedes the winding step.Method according to claim 5, characterized in that during the star disk clamping step, a first star disk adjusting device of the clamping tool (3) is actuated such that a first star disk segment (19) of the first star disk (11) is clamped against the first laminated core segment (21), preferably against a first electrical sheet (15) of the laminated core (9), by means of a first star disk clamping jaw (45) of the clamping tool (3), preferably while building up a first star disk clamping force (Fs,i). Method according to claim 5 or 6, characterized in that during the star disk clamping step, a second star disk adjusting device of the clamping tool (3) is actuated such that a first star disk segment (23) of the second star disk (13) is clamped, preferably while building up a second star disk clamping force. (Fs, 2), is clamped against the first laminated core segment (21), preferably against a second electrical sheet (17) of the laminated core (9), by means of a second star-disk clamping jaw (47) of the clamping tool (3). Method according to claims 6 and 7, characterized in that the first star-disk segment (19) of the first star-disk (11), the first laminated core segment (21), and the first star-disk segment (23) of the second star-disk (13) together form a first winding pole (25), and that in the winding step, the first winding pole (25) is wound with the winding wire (27). Clamping arrangement, preferably for winding a magnet unit of a rotor of an electric machine, preferably with a method according to one of the preceding claims, comprising: a rotor of an electric machine, and a clamping tool (3), wherein the rotor has a rotor shaft (5) equipped with a magnet unit, and wherein the clamping tool (3) is clamped firmly to the magnet unit.Clamping tool of a clamping arrangement according to claim 9.

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