Abstract
A stator for an electric machine, including a shaped rod winding, wherein the shaped rod winding is formed by a plurality of shaped rods which have connecting points in the region of a winding head, wherein the connection points are surrounded by a casting layer, and wherein a thickness of the casting layer is predetermined by an enveloping element which is arranged on the winding head close to the contour.
Claims
1.-9. (canceled)
10. A stator for an electric machine, comprising: a shaped bar winding, wherein the shaped bar winding is formed by a multiplicity of shaped bars which have connection points in the region of an end winding, wherein the connection points are enveloped by a casting layer, and wherein a thickness of the casting layer is predetermined by an enveloping element, which is arranged on the end winding close to the contour.
11. The stator according to claim 10, wherein the enveloping element is connected to the end winding via the casting layer.
12. The stator according to claim 10, wherein the enveloping element has or forms pockets and/or undercuts.
13. The stator according to claim 10, wherein the enveloping element is flexible, at least in regions.
14. The stator according to claim 10, wherein the enveloping element is fastened in a force-fitting manner to the end winding.
15. An enveloping element for the stator according to claim 10.
16. A method for producing a coil, comprising: providing a coil, which has at least one end winding; and using an enveloping element for shaping a casting layer on the at least one end winding.
17. The method according to claim 16, further comprising: introducing a casting compound into the enveloping element prior to attaching the enveloping element to the at least one end winding; and dipping the at least one end winding into the enveloping element.
18. The method according to claim 16, further comprising: arranging the enveloping element on the at least one end winding; and introducing casting compound between the enveloping element and the at least one end winding.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In the drawings:
[0028] FIG. 1 shows a section through an embodiment of an enveloping element in a schematic illustration;
[0029] FIG. 2 shows a side view of a stator with an enveloping element arranged thereon in a schematic view;
[0030] FIG. 3 shows a further schematic view of an embodiment of an enveloping element;
[0031] FIG. 4 shows a plan view of a further schematic view of an embodiment of an enveloping element.
DETAILED DESCRIPTION OF THE DRAWINGS
[0032] FIG. 1 shows a sectional illustration of an enveloping element 20, which has an approximately circular end section 22, from which an inner enveloping section 24 and an outer enveloping section 26 extend along a longitudinal axis L. The longitudinal axis L runs parallel to or on a stator axis (not illustrated further here). The reference symbol 1 denotes a casting compound with which the enveloping element 20 has been filled. Thus, for example, a stator can be dipped with its end winding into an enveloping element 20 which has been prepared in this way. Once the casting compound 1, for example the casting resin, has cured, the enveloping element 20 then remains on the stator or on the end winding. Reference symbol A also illustrates an arrangement direction. In particular, this is intended to mean a direction along which the enveloping element 20 can be pushed onto an end winding. As has already been mentioned, however, it is also possible for the end winding to be moved into the enveloping element 20 in the opposite direction to this arrangement direction A.
[0033] FIG. 2 shows a schematic view of a stator 10, which has an end winding 12 at each end. The stator extends along a longitudinal axis L or along a stator axis S. The stator 10 illustrated here has, for example, a shaped bar winding, wherein the shaped bars or hairpins have been pushed into a stator core from the right-hand side. In the left-hand part, the shaped bars are then transposed or else interconnected to form the end winding 12 illustrated there. In this region, which is illustrated as a section, an enveloping element 20 is now pushed onto the end winding 12 along the arrangement direction A, with the result that, after the casting, a casting layer 2 has been formed around the end winding 12. It can be seen at least schematically that a shape of the enveloping element 20, in particular the arrangement space thereof, which is formed by the end section and the inner and the outer enveloping section, cf. in this regard also FIG. 1, follows a shape of the end winding 12. In the region of the end winding 12, a phase terminal 14 is furthermore also provided, which is used for making electrical contact with the stator 10.
[0034] FIG. 3 shows, in a further schematic illustration, an enveloping element 20, wherein it can be seen in the embodiment shown here that the enveloping element 20 can have pockets 28, which extend radially or axially away from an end section 22 or from an outer enveloping section 26.
[0035] FIG. 4 shows, similarly to FIG. 3, a multiplicity of pockets 28, wherein it can be seen that the pockets 28 extend along a longitudinal axis L or an arrangement direction A. An enveloping element 20 is shown here in a plan view (viewed along the arrangement direction A). The pockets 28 extend radially and axially with respect to the longitudinal axis L of the enveloping element 20. In principle, such pockets serve the purpose of making it possible for the enveloping element to follow, as precisely as possible, a shape or a geometry of the winding head therebeneath. Precisely when the end winding is connected, for example, to a phase terminal assembly, as illustrated in FIG. 2 (reference symbol 14 in this figure), it may arise that some shaped bars practically “protrude” from the end winding. The pockets 28 or else outward bulges, undercuts or the like nevertheless enable a uniform thickness of the casting layer.
LIST OF REFERENCE SYMBOLS
[0036] 1 casting compound [0037] 2 casting layer [0038] 10 coil, stator [0039] 12 end winding [0040] 14 phase terminal [0041] 20 enveloping element [0042] 22 end section [0043] 24 inner enveloping section [0044] 26 outer enveloping section [0045] 28 pocket [0046] L longitudinal axis [0047] S stator axis
