Method for Producing a Rotor, and Rotor

Abstract

A method for producing a rotor includes providing lamella elements and arranging the lamella elements to form a lamella bundle where the lamella bundle has webs. End plates are arranged at respective end faces of the lamella bundle where the end plates axially support the lamella bundle. The lamella bundle is axially fixed or pretensioned by winding conductor material around the webs and a rotor shaft is arranged in the fixed or pretensioned lamella bundle.

Claims

1.-10. (canceled)

11. A method for producing a rotor, comprising the steps of: providing lamella elements and arranging the lamella elements to form a lamella bundle, wherein the lamella bundle has webs; arranging end plates at respective end faces of the lamella bundle, wherein the end plates axially support the lamella bundle; axially fixing or pretensioning the lamella bundle by winding conductor material around the webs; and arranging a rotor shaft in the fixed or pretensioned lamella bundle.

12. The method according to claim 11, wherein the arranging the rotor shaft in the fixed or pretensioned lamella bundle is by press-joining or transverse-joining.

13. The method according to claim 11, wherein the lamella elements are stamped and have a respective stamping burr, and further comprising the steps of: orientating the lamella elements in the lamella bundle such that the respective stamping burrs are orientated in a preferred direction; and providing a recess in the end plate of the end plates which is orientated toward the preferred direction in order to absorb a deformation of the lamella bundle in a region of the rotor shaft.

14. The method according to claim 13, further comprising the step of: orientating the lamella elements in the lamella bundle such that the respective stamping burrs are orientated in an alternating manner.

15. The method according to claim 13, further comprising the step of: arranging the rotor shaft in the preferred direction.

16. The method according to claim 11, further comprising the step of: arranging the rotor shaft in a joining direction until a desired position is reached, wherein the desired position is located in front of an end position with respect to the joining direction.

17. The method according to claim 11, further comprising the step of: radially prefixing the lamella bundle during a winding operation of winding conductor material around the webs.

18. A rotor, comprising: a lamella bundle formed by lamella elements; and end plates arranged at respective end faces of the lamella bundle; wherein at least one end plate of the end plates has a recess which is configured to absorb an axial deformation of the lamella bundle.

19. The rotor according to claim 18, further comprising a winding, wherein the lamella bundle is axially pretensioned in a region of webs of the lamella bundle by the winding.

20. The rotor according to claim 18, wherein the lamella elements have a respective stamping burr which is orientated in a direction toward the recess.

21. An electric motor, comprising: a rotor produced by the method according to claim 11.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG. 1 shows a perspective view of an embodiment of a rotor; and

[0044] FIG. 2 shows a sectioned view of the rotor shown in FIG. 1.

DETAILED DESCRIPTION OF THE DRAWINGS

[0045] FIG. 1 shows a perspective illustration of a rotor having a lamella bundle 10, wherein this forms a large number of webs 14. End plates 20 are formed in each case at the end face on the lamella bundle 10. A rotor shaft 60 is arranged in the lamella bundle 10. The arrangement is carried out in such a manner that the rotor shaft 60 is cooled, whilst the lamella bundle 10 is heated. Particularly if the lamella elements are stamped lamella elements, deformations occur during cooling. In order to compensate for these, conductor material is already wound around the lamella bundle 10 before the rotor shaft 60 is arranged, cf. the winding 40. It has been found that an axial pretensioning can thereby be achieved and counteracts a deformation of the lamella bundle, in particular in the region of the webs 14. This is enabled in particular in cooperation with the end plates 20 which are advantageously constructed to be correspondingly flexurally rigid.

[0046] FIG. 2 shows the rotor known from FIG. 1 as a cross section. The lamella bundle 10 can be seen in particular. This bundle is formed by a large number of individual, thin lamella elements which, however, cannot be seen in this illustration. The lamella bundle 10 has an opening 12 in which the rotor shaft 60 is arranged. This shaft is constructed in particular as a hollow shaft which comprises an arrangement region 62. This arrangement region 62 is advantageously configured to introduce or direct away a torque into the rotor. In the embodiment shown here, the arrangement region is constructed as a wedge tooth arrangement. The rotor shaft 60 extends along a rotor axis R. The end plates are arranged at the end side on the lamella bundle 10, wherein they also have in each case an opening 64, through which the rotor shaft 60 extends. The end plates 20 each have support faces 24 which are constructed for end-face abutment against the lamella bundle 10. The reference numerals 26 refer to the redirection regions of the end plates 20, against which the winding abuts and is redirected. In the embodiment shown here, the left end plate 20 has in the region of the support face 24 a recess 22 which is configured to absorb a deformation of the lamella bundle 10 in this region. The lamella elements which, as mentioned, cannot be seen in the embodiment shown here, are arranged in such a manner that the stamping burrs thereof are orientated in the direction toward the above-mentioned recess 22. During cooling, the lamella bundle 10 bulges in the region of the opening 12 in the direction toward the recess 22. By reserving this compensation space, there are no further occurrences of tension within the entire arrangement, comprising the end plates 20 and the lamella bundle 10. The geometry of the end state advantageously remains orthogonal with respect to the rotor axis R. The arrangement of the rotor shaft 60 is advantageously carried out in a joining direction F. It has been found that any friction forces which may be present between the rotor shaft 60 and the lamella bundle 10 during the thermal joining operation develop in the desired direction. As a result of the deformation behavior of the lamella bundle 10, there is an axial displacement of the rotor shaft 60 in the lamella bundle 10 during cooling. The axial displacement is advantageously compensated for by reserving a compensation value in the joining tool when the rotor shaft 60 is joined.

LIST OF REFERENCE CHARACTERS

[0047] 10 Lamella bundle [0048] 12 Opening [0049] 14 Web [0050] 20 End plate [0051] 22 Recess [0052] 24 Support face [0053] 26 Redirection region [0054] 40 Winding [0055] 60 Rotor shaft [0056] 62 Arrangement region [0057] 64 Opening [0058] R Rotor axis [0059] F Joining direction