DE102022200727A1 - Process for impregnating a rotor for an electrical machine - Google Patents

Abstract

In order to provide a method for impregnating a rotor for an electrical machine, with which the post-processing effort, in particular the cleaning of the impregnated rotor, is reduced, a method (100) for impregnating a rotor (10) for an electrical machine is proposed, the rotor (10) has a plurality of rotor teeth (11), comprising the steps:- winding the rotor teeth (11) with at least one electrical conductor (12) to form at least one exciter coil (13), free spaces ( 14). has an excitation coil (13), and- introducing an impregnating agent into the at least one channel (15, 20, 21, 21a) of the at least one insert body (200), so that the impregnating agent is fed to the at least one excitation coil (13).

Description

The present invention relates to a method for impregnating a rotor for an electrical machine, the rotor having a plurality of rotor teeth.

Furthermore, the present invention relates to an insert body for use in such a method.

When constructing electrical machines, in particular externally excited synchronous machines, these are usually impregnated with resin. Impregnation with resin improves insulation strength and fixes the turns of the excitation coils.

In the prior art, dip impregnation, trickle impregnation, dip rolling and casting are used for the impregnation of rotors for separately excited synchronous machines. The disadvantage of these known methods is that resin or impregnating agent is also applied to areas where it is not desired or has no function. This can lead to excess resin being detached on the peripheral side of the rotor as a result of the subsequent rotation of the rotor in the stator. Another problem, particularly with the dipping process, is soiling of the bearing seats of the rotor or the rotor shaft. Such contamination must be cleaned off before the bearings are joined. Disadvantages of the known impregnation methods are also the increased use of materials, the long process times and the considerable tool and investment costs. When impregnating the rotors of separately excited synchronous machines by casting, there is always a sealing problem, which results in a high level of cleaning effort.

In order to remedy these known disadvantages, it has been proposed in the prior art, among other things, to subsequently remove excess casting resin at undesired locations mechanically or using other methods, such as a laser method, for example.

However, this leads to a considerable amount of reworking. Alternatively, tool concepts with masking areas, also known as masking, are used. However, these solutions also require a great deal of effort and do not completely solve the problem of subsequent cleaning. Resin adhesions and residual dirt problems can also occur.

From the DE 10 2018 221 887 A1 a method is known for fully encapsulating a rotor, which is designed with a rotor winding, for an electrical machine. In this case, a rotor and a displacement body having a continuous channel are arranged in a casting mold. To fill the casting mold with a casting compound, the casting compound is introduced through the channel of the displacement body into the lower area of the casting mold, so that the casting compound rises in the casting mold.

From the DE 10 2017 222 610 A1 a rotor and a method for manufacturing a rotor are known. The rotor for an electrical machine comprises at least one slot, wherein the at least one slot has a slot bottom and slot walls, and wherein a separating element is provided between the slot walls, which extends along the slot, and wherein the separating element is arranged at least in sections on the slot bottom in such a way that slot chambers are formed along the slot. The groove walls are formed by the pole teeth or the rotor teeth, so that a groove chamber segment running around a rotor tooth is formed. The groove chambers are then cast with casting compound.

The GB 2 310 544 A discloses a reluctance motor rotor made by clamping a stack of thin ferromagnetic laminations between two end caps. A series of slots are machined into each lamination, with the ferromagnetic material forming a flux guide between these slots. Ribs are formed around the perimeter of the sheets enclosing the slots. The slots are filled with an epoxy through holes in the end cap. The initially liquid resin is then cured in an oven. Once the resin has set, the outer rib can be milled off to expose the resin.

The object of the present invention is to provide a method for impregnating a rotor for an electrical machine, with which the post-processing effort, in particular the cleaning of the impregnated rotor, is reduced.

• - Bewickeln der Rotorzähne mit mindestens einem elektrischen Leiter zur Bildung mindestens einer Erregerspule, wobei zwischen den bewickelten Rotorzähnen Freiräume ausgebildet werden,
• - Anordnen mindestens eines Einsatzkörpers in mindestens einen der Freiräume, wobei der mindestens eine Einsatzkörper mindestens einen Kanal zum direkten Zuführen eines Imprägniermittels zu der mindestens einen Erregerspule aufweist, und
• - Einführen eines Imprägniermittels in den mindestens einen Kanal des mindestens einen Einsatzkörpers, sodass das Imprägniermittel der mindestens einen Erregerspule zugeführt wird.

To achieve the object on which the invention is based, a method for impregnating a rotor for an electrical machine is proposed, the rotor having a plurality of rotor teeth, the method comprising the following steps:

• - winding the rotor teeth with at least one electrical conductor to form at least one excitation coil, free spaces being formed between the wound rotor teeth,
• - Arranging at least one insert body in at least one of the free spaces, wherein the at least one insert body has at least one channel for the direct supply of an impregnating agent to the at least one excitation coil, and
• - Introducing an impregnating agent into the at least one channel of the at least one insert body, so that the impregnating agent is fed to the at least one excitation coil.

The rotor can be a rotor for a separately excited synchronous machine.

The rotor teeth can also be referred to as pole teeth.

Furthermore, the method can include providing a rotor with rotor teeth as an upstream step.

The free spaces formed when the rotor teeth are wound can be located in the circumferential direction between two wound rotor teeth and preferably extend from a first end face of the rotor in an axial direction to a second end face of the rotor. Starting from an inner circumference or from a rotor shaft or from an opening for a rotor shaft of the rotor, the free spaces can widen radially outwards, so that the free spaces are of approximately wedge-shaped design.

According to the invention, at least one insert body is inserted into at least one of the free spaces, which has at least one channel for the direct supply of an impregnating agent to the at least one excitation coil. An impregnating agent is then introduced into the at least one channel of the insert body and is fed directly to the excitation coil through the at least one channel. The excitation coil is wetted by the impregnating agent and can then at least partially absorb the impregnating agent, so that the rotor is thereby impregnated. For this purpose, the at least one insert body can have an outlet opening which faces the at least one excitation coil or which opens towards the at least one excitation coil. Impregnating agent introduced into the at least one channel of the at least one insert body then flows through the at least one channel and through the outlet opening directly to the at least one excitation coil. Instead of outlet openings, other feed means can also be provided. For example, a region of the at least one insert body that is in the immediate vicinity of or in direct contact with the exciter coil can have porous or fibrous material through which the impregnating agent can escape and wet the exciter coil.

The amount of impregnating agent can be reduced by the use of an insert body provided according to the invention. In addition, the post-processing effort is reduced by the targeted application of the impregnating agent to the at least one excitation coil. Overall, less impregnating agent is used, which is also only supplied to the areas in which it is required for impregnating the rotor.

The at least one insert body can also have more than one channel.

Provision can further preferably be made for a plurality of insert bodies to be arranged in the free spaces, with the insert bodies having at least one channel for supplying an impregnating agent directly to the at least one excitation coil, and with the impregnating agent being introduced into the at least one channel of the plurality of insert bodies, so that the impregnating agent is fed to the at least one exciter coil.

In other words, insert bodies can be inserted into several of the free spaces, preferably into all free spaces. Insofar as the invention is explained below in relation to at least one insert body, it is understood that a plurality of insert bodies can also be arranged in the free spaces in any case.

Provision is preferably made for the impregnating agent to be absorbed by the at least one excitation coil by the action of capillary forces.

The impregnating agent, which is preferably liquid when it is introduced into the at least one channel of the at least one insert body, is fed through the at least one channel of the at least one insert body to the at least one excitation coil and wets it at least on the outside. Due to the narrow inter-winding spaces of the exciter coil, capillary forces arise, through which the impregnating agent supplied to the exciter coil can be drawn into the inter-winding spaces. The liquid impregnating resin is thus not only applied to the outside of the exciter coil, but preferably also distributed at least partially inside the exciter coil in the intermediate winding spaces.

It is preferably provided that the impregnating agent is a resin.

Furthermore, it can be provided that the at least one insert body has a plurality of channels, the channels of the at least one insert body forming a channel system.

The channels of each insert body are thus connected to one another, so that impregnating agent introduced into the channels can be supplied to different areas of the excitation coil through the channels of the channel system.

It is preferably provided that the at least one insert body has at least one axial channel and at least one transverse channel, preferably aligned approximately perpendicular to the at least one axial channel.

The axial passage of the insert body runs parallel to the axial direction of the rotor in the spaced state of the insert body. In this case, the impregnating agent can be introduced, for example, through an end face of the insert body into the axial channel and is then guided to the excitation coil through the transverse channels aligned approximately perpendicularly to the axial channel.

It can preferably be provided that the insert body has a multiplicity of transverse channels.

Provision is preferably made for the at least one insert body to be essentially in the form of a wedge and/or for the insert body to have end faces, an outer face and side faces.

The insert body is designed in particular to complement the shape of the free spaces formed when the rotor teeth are wound. The insert body, in particular the wedge, has two end faces which, when arranged in the free space of the rotor, are aligned approximately parallel to the end faces of the rotor. The insert body, in particular the wedge, also has an outer surface which ends approximately flush with the circumferential surface of the rotor when the insert body is arranged in the free space. Furthermore, the wedge preferably has side surfaces. When the insert body is in the free space, the side surfaces are arranged in contact with the at least one excitation coil or face the excitation coil. The insert body can also have an inner surface which, when the insert body is arranged in the free space of the rotor, comes to lie in the area of the rotor shaft or the opening of the rotor shaft or in the area of an inner side of the rotor. The insert body can thus also be designed in the form of a truncated wedge.

With this configuration, the insert body can be introduced into the free space with a precise fit, so that the impregnating agent can be supplied in a targeted manner to the at least one excitation coil.

Furthermore, it is preferably provided that the at least one insert body has an inlet opening for introducing the impregnating agent into the at least one channel, and that the impregnating agent is introduced through the inlet opening into the at least one channel of the insert body, it being further preferably provided that the inlet opening is arranged on an end face and/or on the outer surface of the insert body.

In the case of an inlet opening in one of the end faces of the insert body, the impregnating agent is thus fed to the at least one channel through the inlet opening after the at least one insert body has been arranged in the at least one free space along the axial direction, which corresponds to the axial direction of the rotor. If the inlet opening is arranged on the outer surface of the insert body, the impregnating agent is correspondingly introduced perpendicularly to the axial direction of the rotor along a radial direction through the inlet opening into the at least one channel of the insert body.

Furthermore, it can preferably be provided that the insert body has at least one outlet opening for supplying the impregnating agent to the at least one excitation coil, with the outlet opening preferably being arranged on a side surface.

The impregnating agent preferably introduced through the inlet opening into the at least one channel flows through the at least one channel, more preferably through the channel system, and particularly preferably from the axial channel into the transverse channels of the insert body, and emerges from the outlet openings in the side surface. The outlet openings are preferably outlet openings of the transverse channels. Due to the arrangement of the side surfaces on the exciter coil, the impregnating agent is thus supplied directly and immediately from the outlet openings to the exciter coil.

With a further advantage, it can be provided that the rotor is heated, preferably before the step of introducing the impregnating agent into the at least one channel of the insert body, with the at least one excitation coil being more preferably energized.

Due to the heating, which is caused in particular by the energization of the exciter coil, the impregnating agent is kept in a liquid state and can thus be particularly well through the flow at least one channel and are fed to the excitation coil and received by the excitation coil. The final hardening of the impregnating agent can be achieved through the effects of time and temperature.

Furthermore, it can preferably be provided that the rotor is rotated, more preferably after the step of introducing the impregnating agent into the at least one channel of the insert body.

Due to the rotation of the rotor, the impregnating agent located in the at least one channel is evenly distributed on the excitation coil. As a result, the rotor can be impregnated evenly and the use of impregnating agents is reduced.

With a further advantage, it can be provided that the rotor, preferably after the step of introducing the impregnating agent into the at least one channel of the insert body, is stored in a heating device, in particular in a curing oven, with the rotor being more preferably stored in a horizontal orientation.

The impregnating agent, in particular the resin, can be cured in the heating device by the action of time and temperature. It can also be provided that the rotor mounted in the heating device is additionally rotated. This ensures optimal distribution of the impregnating agent on the excitation coil.

With a further advantage it can be provided that the at least one channel, in particular the inlet opening, is preferably closed after the step of introducing the impregnating agent into the at least one channel of the insert body.

On the one hand, this ensures that no liquid impregnating agent escapes from the inlet opening of the inlet body in an undesired manner. Closing the inlet opening is particularly advantageous when the rotor is stored in a horizontal orientation in a heating device, more preferably while it is being rotated.

Furthermore, it can be provided that after the impregnating agent has been supplied to the at least one excitation coil, excess impregnating agent is removed through the inlet opening.

As soon as the excitation coil is sufficiently wetted or has taken up a sufficient amount of impregnating agent, excess impregnating agent, preferably in the liquid state, can be removed or poured out of the inlet opening of the insert body by appropriate handling of the rotor.

It can preferably also be provided that the at least one insert body is removed from the free space after the impregnating agent has been fed to the at least one excitation coil, or that the insert body is left in the free space after the impregnating agent has been fed to the at least one excitation coil.

The free spaces are released again by removing the insert body. This reduces the weight of the rotor and, in particular, further processing steps can be carried out without being hindered by the insert body. Alternatively, however, it is also possible for the insert bodies to remain in the free spaces. This means in particular that the insert bodies, in particular the outer surfaces of the insert bodies, form part of the outer wall in the circumferential direction of the rotor in the finished rotor.

With a further advantage it can be provided that after the at least one insert body has been arranged in the free space, closing elements, preferably end caps, safety caps or balancing disks, are arranged on the end faces of the rotor.

The insert bodies are fixed in the free spaces by the arrangement of end elements. No further securing of the insert body in the free space is therefore required.

For this purpose it can be provided that the closing elements have one or more openings and that the impregnating agent is fed to the at least one channel, more preferably the inlet opening, of the insert body through the opening of the closing elements.

The closing elements therefore preferably have openings through which the impregnating agent can be fed to the at least one channel, more preferably to the inlet opening of the insert body.

In addition, it can be provided that after the insert body has been arranged in the free space, a tool is arranged on the end faces of the rotor, and that the tool is removed again after the impregnating agent has been fed to the at least one excitation coil, preferably after the impregnating agent has hardened.

By using a tool, the body or inserts in the Freiräu men be fixed, so that there is no need for additional fasteners.

In addition to or instead of a tool, it can also be provided that the rotor is arranged on a workpiece carrier and that the rotor is removed from the workpiece carrier again after the impregnating agent has been fed to the at least one excitation coil.

In this case, too, it is preferably provided that the tool and/or the tool carrier has an opening, with the impregnating agent being fed to the at least one channel, more preferably the inlet opening, of the insert body through the opening of the tool and/or the tool carrier.

Correspondingly, the tool and/or the tool carrier has at least one opening through which the impregnating agent can be supplied to the at least one channel of the insert body, more preferably to the inlet opening.

A further solution to the problem on which the invention is based consists in providing an insert body for use in a method described above, the insert body having at least one channel.

All of the properties, features and functions of the insert body used therein which are explained in connection with the method described above can also be transferred in an analogous manner to the insert body according to the invention. Conversely, all of the features of the insert body explained below can also be used in a corresponding and analogous manner in the method described above.

It is thus preferably provided that the insert body is designed essentially in the form of a wedge and/or that the insert body, in particular the wedge, has end faces, an outer face and side faces.

Furthermore, it can preferably be provided that the at least one insert body has at least one axial channel and at least one transverse channel, preferably aligned approximately perpendicular to the at least one axial channel.

It is preferably provided that the at least one channel of the insert body, in particular the at least one axial channel and the at least one transverse channel, form a channel system.

Furthermore, it is preferably provided that the insert body has an inlet opening for introducing an impregnating agent into the at least one channel, the inlet opening preferably being arranged on an end face and/or on the outer surface of the insert body.

In addition, it can be provided that the insert body has at least one outlet opening for dispensing the impregnating agent, with the outlet opening being arranged on a side surface.

With a further advantage it can be provided that the insert body consists of a plastic or comprises a plastic.

• 1 ein Ablaufdiagramm eines Verfahrens zum Imprägnieren eines Rotors,
• 2 eine Aufsicht auf einen Rotor für eine elektrische Maschine in einer Axialrichtung des Rotors mit in Freiräumen angeordneten Einsatzkörpern,
• 3 eine Querschnittsansicht eines Rotors mit in Freiräumen angeordneten Einsatzkörpern,
• 4 eine perspektivische Ansicht eines Rotors mit in Freiräumen angeordneten Einsatzkörpern,
• 5 eine Schnittansicht durch einen Rotor mit in Freiräumen angeordneten Einsatzkörpern,
• 6 eine weitere Schnittansicht durch einen Rotor mit in Freiräumen angeordneten Einsatzkörpern,
• 7 eine weitere perspektivische Ansicht eines Rotors mit in Freiräumen angeordneten Einsatzkörpern, und
• 8 eine weitere Schnittansicht durch einen Rotor mit in Freiräumen angeordneten Einsatzkörpern.

The invention is explained in more detail below with reference to the accompanying figures. Show it

• 1 a flowchart of a method for impregnating a rotor,
• 2 a top view of a rotor for an electrical machine in an axial direction of the rotor with insert bodies arranged in free spaces,
• 3 a cross-sectional view of a rotor with insert bodies arranged in free spaces,
• 4 a perspective view of a rotor with insert bodies arranged in free spaces,
• 5 a sectional view through a rotor with insert bodies arranged in free spaces,
• 6 another sectional view through a rotor with insert bodies arranged in free spaces,
• 7 a further perspective view of a rotor with insert bodies arranged in free spaces, and
• 8th another sectional view through a rotor with insert bodies arranged in free spaces.

Based on the figures in the flowchart 1 shown method 100 for impregnating in the 2 until 8th illustrated rotor 10 explained for an electric machine not shown in detail. 1 shows a flow chart of the method 100. 2 shows a plan view along an axial direction of the rotor 10 running into the plane of the figure. 3 12 shows a cross-sectional view of the rotor 10. FIG 2 .

In a first step S1 of the method 100 for impregnating a rotor 10, a plurality of rotor teeth 11 of the rotor 10 are wound with an electrical conductor 12 to form at least one excitation coil 13. In this case, 11 free spaces are between the wound rotor teeth 14 trained. In a second method step S2, insert bodies 200 are arranged in the free spaces 14. The insert bodies 200 have channels 15 for supplying an impregnating agent directly to the at least one excitation coil 13 . In a third method step S3, an impregnating agent is introduced into the channels 15 of the insert body 200, so that the impregnating agent is fed to the excitation coil 13.

The insert body 200 are after 2 and 3 formed approximately wedge-shaped and each have end faces 16, an outer surface 17 and side surfaces 18 on. The insert bodies 200 are arranged in the free spaces 14 in such a way that the side surfaces 18 of the insert bodies 200 face the excitation coil 13 and are in contact with the excitation coil 13 . After the impregnating agent has been introduced into the channels 15 of the insert bodies 200, it is fed to the at least one excitation coil 13. This is explained in more detail using the 4 until 8th explained.

4 shows a schematic perspective view of a rotor 10 with insert bodies 200 inserted in the free spaces 14. For the sake of clarity, the excitation coil 13 is not shown in detail. The insert bodies 200 are arranged in the free spaces 14 between the wound rotor teeth 11 and each have an inlet opening 19 on their end face 16 through which the impregnating agent can be introduced into the channels 15 .

5 shows a sectional view of the rotor 10 of FIG 4 . The interior of the insert bodies 200 has an axial channel 20 and transverse channels 21 which essentially run in a plane perpendicular to the axial channel 20 and are aligned in the direction of the wound rotor teeth 11 . Each of the transverse channels 21 has an outlet opening 22 in the side surface 18 of the respective insert body 200 . Impregnating agent introduced through the inlet opening 19 into the axial channel 20 is conducted via the axial channel 20 into the transverse channels 21 and emerges from the outlet opening 22 and is thus fed directly to the excitation coil 13 of the wound rotor teeth 11 . In this sense, the axial channel 20 and the transverse channels 21 form a channel system 23 .

6 shows a sectional view of a variant of the rotor 10. In this variant, four transverse channels 21 are provided in the insert bodies 200 in the sectional plane shown, which are aligned essentially perpendicular to the axial channel 20. In addition, however, the functionality is largely identical to that of the 5 . It goes without saying that the insert bodies 200 in further sectional planes than the one in 5 and 6 Section plane shown may have further transverse channels 21.

7 shows a further perspective view of a rotor 10 with insert bodies 200. The insert bodies 200 according to FIG 7 are arranged with an inner surface 24 at a distance from an inner side 25 of the rotor 10 . This creates a gap 26 between each insert body 200 and the inside 25 of the rotor 10 , which gap runs in the axial direction of the rotor 10 . In the sectional view after 8th It can be seen that the insert bodies 200 have three transverse channels 21, 21a in the sectional plane shown, two of the transverse channels 21 running approximately in the circumferential direction and being arranged with outlet openings 22 directly adjacent to the wound rotor teeth 11. A third transverse channel 21a also runs in a plane perpendicular to the axial channel 20 and runs radially in the direction of the gap 26 between the rotor 10 and the insert body 200. If an impregnating agent is introduced into the inlet opening 19 of the axial channel 20, part of the impregnating agent escapes from the outlet opening 22 of the radially running transverse channel 21a into the gap 26 between the insert body 200 and the rotor 10 a. How from the 7 can also be seen, between a side face 18 of an insert body 200 and a rotor tooth 11 arranged adjacent to it, a gap 27 tapering to a point can also be formed. This tapering gap 27 enables tolerance compensation and also promotes a large-area distribution of the impregnating agent on the excitation coil 13 of the rotor tooth 11.

Returning to 3 After the insert bodies 200 have been arranged in the free spaces 14 between the rotor teeth 11 on the end faces 28 of the rotor 10, a closing element 29, such as an end cap 29a, can be arranged in each case, with which the insert bodies 200 are held in the free spaces 14. It is important to ensure that at least one of the closing elements 29 has an opening 30 through which the impregnating agent can be fed to the channels 15 of the insert body 200 .

After the impregnation agent has been introduced into the channels 15 of the insert body 200 , it emerges from the outlet openings 22 in the side surfaces 18 and, if necessary, in the inner surface 24 . In order to distribute and harden the impregnating agent, the rotor 10 is then placed in a heating device, not shown, such as a hardening oven, and is thereby rotated about the axial direction. The rotation causes the impregnating agent to be distributed evenly over the excitation coils 13 .

Reference List

100

Proceedings

200

insert body

10

rotor

11

rotor tooth

12

Electrical conductor

13

excitation coil

14

free space

15

channel

16

face

17

outer surface

18

side face

19

intake port

20

axial channel

21

cross channel

21a

cross channel

22

exhaust port

23

canal system

24

Inner surface

25

inside

26

gap

27

gap

28

face

29

final element

29a

end cap

30

opening

S1-S3

process steps

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102018221887 A1 [0007]
• DE 102017222610 A1 [0008]
• GB 2310544A [0009]

Claims (10)

Method (100) for impregnating a rotor (10) for an electrical machine, the rotor (10) having a plurality of rotor teeth (11), comprising the steps: - Winding the rotor teeth (11) with at least one electrical conductor (12) to form at least one excitation coil (13), free spaces (14) being formed between the wound rotor teeth (11), - Arranging at least one insert body (200) in at least one of the free spaces (14), wherein the at least one insert body (200) has at least one channel (15, 20, 21, 21a) for the direct supply of an impregnating agent to the at least one excitation coil (13), and - Introducing an impregnating agent into the at least one channel (15, 20, 21, 21a) of the at least one insert body (200), so that the impregnating agent is fed to the at least one excitation coil (13). Method (100) according to claim 1 , wherein a plurality of insert bodies (200) is arranged in the free spaces (14), wherein the insert bodies (200) have at least one channel (15, 20, 21, 21a) for supplying an impregnating agent directly to the at least one excitation coil (13), and wherein the impregnating agent is introduced into the at least one channel (15, 20, 21, 21a) of the plurality of insert bodies (200), so that the im embossing means of the at least one excitation coil (13) is supplied. Method (100) according to claim 1 or 2 , wherein the impregnating agent is absorbed by the at least one excitation coil (13) through the action of capillary forces, and/or wherein the impregnating agent is a resin, and/or wherein the at least one insert body (200) has a plurality of channels (15, 20, 21, 21a), the channels (15, 20, 21, 21a) of the at least one insert body (200) forming a channel system (23). Method (100) according to one of the preceding claims, characterized in that the at least one insert body (200) has at least one axial channel (20) and at least one transverse channel (21, 21a), preferably aligned approximately perpendicularly to the at least one axial channel (20). The method (100) according to any one of the preceding claims, wherein the at least one insert body (200) is essentially in the form of a wedge, and/or wherein the insert body (200) has end faces (16), an outer face (17) and side faces (18). Method (100) according to one of the preceding claims, wherein the at least one insert body (200) has an inlet opening (19) for introducing the impregnating agent into the at least one channel (15, 20, 21, 21a), the impregnating agent being introduced through the inlet opening (19) into the at least one channel (15, 20, 21, 21a) of the insert body (200), the inlet opening (19 ) is preferably arranged on the end face (16) and/or on the outer surface (17), and/or wherein the insert body (200) has at least one outlet opening (22) for feeding the impregnating agent to the at least one excitation coil (13), the outlet opening (22) preferably being arranged on the side surface (18). Method (100) according to one of the preceding claims, wherein the rotor (10), preferably before the step of introducing the impregnating agent into the at least one channel (15, 20, 21, 21a) of the insert body (200), is heated, wherein more preferably the at least one exciter coil (13) is energized, and/or wherein the rotor (10), preferably after the step of introducing the impregnating agent into the at least one channel (15, 20, 21, 21a) of the insert body (200), and/or wherein the rotor (10), preferably after the step of introducing the impregnating agent into the at least one channel (15, 20, 21, 21a) of the insert body (200), is stored in a heating device, in particular in a curing oven, with the rotor (10) more preferably being stored in a horizontal orientation. Method (100) according to one of the preceding claims, wherein the at least one channel (15, 20, 21, 21a), in particular the inlet opening (19), is preferably closed after the step of introducing the impregnating agent into the at least one channel (15, 20, 21, 21a) of the insert body (200), and/or wherein, after the impregnating agent has been fed to the at least one excitation coil (13), excess impregnation is removed through the inlet opening (19), and/or wherein the at least one insert body (200) is removed from the free space (14) after the impregnating agent has been fed to the at least one exciter coil (13), or wherein the insert body (200) is left in the free space (14) after the impregnating agent has been fed to the at least one exciter coil (13). Method (100) according to one of the preceding claims, wherein after the at least one insert body (200) has been arranged in the free space (14), closing elements (29), preferably end caps (29a), safety caps or balancing disks, are arranged on end faces (28) of the rotor (10), the closing elements (29) preferably being one Have an opening (30), and wherein the impregnating agent is fed to the at least one channel (15, 20, 21, 21a), more preferably the inlet opening (19), of the insert body (200) through the opening (30) of the closing elements (29). Insert body (200) for a method (100) according to one of the preceding claims, wherein the insert body has at least one channel (15, 20, 21, 21a).

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