Rotor and Method for Producing a Rotor

Abstract

A rotor, in particular for a current-excited electric machine, comprising a winding, wherein on or against the winding is arranged a support element made of a composite material comprising matrix material and fiber material.

Claims

1-12. (canceled)

13. A rotor for a current-excited electric machine comprising: a winding, wherein a support element composed of a composite material, comprising matrix material and fiber material, is arranged on or against the winding.

14. The rotor according to claim 13, wherein the fiber material is wound around the winding.

15. The rotor according to claim 13, wherein the fiber material is of thread-like form and is oriented along or parallel to conductor elements of the winding.

16. The rotor according to claim 13, wherein the fiber material is a reinforcing fiber.

17. The rotor according to claim 16, wherein the fiber material is a pre-impregnated glass fiber.

18. The rotor according to claim 13, wherein the support element has a first region and a second region, wherein the fiber material reinforces the matrix material in the first region, and wherein the matrix material is not reinforced with the fiber material in the second region.

19. The rotor according to claim 13, wherein the matrix material is an insulation material.

20. The rotor according to claim 13, wherein the support element is overmolded or encapsulated with potting compound.

21. The rotor according to claim 13, wherein an enveloping element is arranged on the support element at least in certain regions.

22. A method for producing a rotor, comprising: winding a rotor body to form a winding; winding fiber material around the winding to form a support element, wherein the support element comprises the fiber material and matrix material; and applying the matrix material during or after winding the fiber material around the winding.

23. The method according to claim 22, comprising: winding the fiber material comprising the matrix material around the winding.

24. The method according to claim 22, comprising: applying the matrix material to the already wound fiber material.

25. The method according to claim 24, comprising: applying the matrix material to the already wound and untreated fiber material.

26. The method according to claim 22, comprising: compacting the winding while the fiber material is being wound around.

27. The method according to claim 22, comprising: orienting the fiber material along or parallel to conductor elements of the winding.

28. The method according to claim 22, comprising: overmolding or encapsulating the support element with potting compound.

29. The method according to claim 22, comprising: arranging an enveloping element on the support element at least in certain regions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG. 1 shows a schematic sectional view of a rotor for the purpose of illustrating the function of the support element;

[0042] FIG. 2 shows the depiction known from FIG. 1, the support element here forming a contiguous layer.

DETAILED DESCRIPTION

[0043] FIG. 1 shows a schematic view of a cross section through a rotor 10, said cross section extending along a rotor axis R. Two rotor teeth 12 which lie next to one another and which form a winding groove or rotor groove therebetween are depicted. It is schematically illustrated that a winding 20, comprising a multiplicity of conductor elements, such as copper wires, is wound around the left-hand rotor tooth 12 to produce and form the winding 20. A support element 40 is formed/arranged on the winding 20. The support element 40 is preferably generated by fiber material 42 being wound around the winding 20. Expediently, said fiber material has already been provided or infiltrated with matrix material 44. In the present case, it is depicted that the fiber material 42 is enveloped by matrix material 44 in the present case. The fact that the right-hand rotor tooth 12 is not provided with a winding or a support element serves merely for improved clarity of the illustration. Winding the fiber material 42 (in addition to matrix material 44) around the winding 20 expediently allows the winding 20 to be compacted, as a result of which the mechanical stability during operation can be increased considerably. The preferably thread-like fiber material 42 adapts to an outer contour of the winding 20 in an ideal manner, as a result of which particularly good stabilization of the winding 20 can also be achieved. A rotor, as depicted in FIG. 1, may additionally be surrounded, in particular for example sprayed, sprinkled, overmolded or encapsulated, with potting compound after the arrangement of the support element 40. In this regard, for stabilization, the potting compound expediently does not have to penetrate into the winding 20 itself. Expediently, cavities, voids or gaps etc. can remain within the winding, which can result in a considerable weight saving. FIG. 1 shows a schematic view of a support element 40 which has not yet been completed. In particular, no contiguous layer has yet been formed, cf. in this regard FIG. 2.

[0044] FIG. 2 shows the depiction known substantially from FIG. 1. In the present case, the support element 40 is now in the form of a contiguous fiber-plastics composite body. In this regard, the matrix material 44 provided by way of the fiber material 42 has blended. This may have already been realized automatically during the winding-around operation if the matrix material 44 is not solid from the outset. As an alternative, the blending may be effected by heating the rotor 10. The heat may be supplied externally, for example by way of a heating device, or from the inside as it were, by way of a current flow which is generated in the winding 20. According to an alternative embodiment, the matrix material may also fill the space between the two rotor teeth 12, entirely or at least in certain regions. According to one embodiment, the aforementioned space is closed in the radial direction by way of a groove closing wedge. As a further alternative, a support element 40 as depicted in FIG. 2 or in FIG. 1 may, as already mentioned, be overmolded or encapsulated with potting compound, wherein here the aforementioned space is also completely filled with potting compound.

LIST OF REFERENCE DESIGNATIONS

[0045] 10 Rotor [0046] 12 Rotor tooth [0047] 20 Winding [0048] 22 Conductor element, copper wire [0049] 40 Support element [0050] 42 Fiber material [0051] 44 Matrix material [0052] R Rotor axis