Abstract
A slot wedge having a stem region and an engagement region perpendicular thereto radially closes a slot in an electrical machine. The engagement region is in engagement with deformed regions of a slot insulation material. A closure cap can fasten the slot wedge in the slot. Protrusions which limit a creepage distance can be provided on the stem region or on a possible closure cap.
Claims
1. A slot wedge having a stem region and an engagement region perpendicular to the stem region.
2. The slot wedge according to claim 1, wherein the engagement region is plate-shaped.
3. The slot wedge according to claim 1, wherein a closure cap is provided on the stem region.
4. The slot wedge according to claim 3, wherein protrusions which limit a creepage distance are provided on the closure cap.
5. The slot wedge according to claim 1, wherein protrusions which delimit a creepage distance are provided on the stem region.
6. A method for closing a slot, comprising at least the following steps: introducing a slot insulation material into the slot; introducing a winding into the slot; deforming the slot insulation material in such a way that at least two opposite regions of the slot insulation material are directed towards a central axis of the slot; introducing a slot wedge having a stem region and an engagement region perpendicular to the stem region into the slot in such a way that the engagement region of the slot wedge engages with the at least two opposite regions of the slot insulation material.
7. The method according to claim 6, wherein the slot wedge has a closure cap and the closure cap fastens the slot wedge in the slot.
8. The method according to claim 7, wherein protrusions which limit a creepage distance when the slot wedge is introduced into the slot, are provided on the closure cap.
9. The method according to claim 6, wherein protrusions which limit a creepage distance when the slot wedge is introduced into the slot are provided on the stem region.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The disclosure and the advantages thereof are explained in more detail below with reference to the accompanying schematic drawings.
[0021] FIG. 1 shows a first exemplary embodiment of a slot wedge according to the disclosure.
[0022] FIG. 2 shows the exemplary embodiment from FIG. 1 in a top view.
[0023] FIG. 3 shows a second exemplary embodiment of a slot wedge according to the disclosure.
[0024] FIG. 4 shows the exemplary embodiment from FIG. 3 in a top view.
[0025] FIG. 5 shows an example of the closure of a slot according to the disclosure.
[0026] FIG. 6 shows another example of the closure of a slot according to the disclosure.
[0027] The drawings merely represent exemplary embodiments of the disclosure and are therefore not to be construed as limiting the disclosure to the exemplary embodiments shown.
DETAILED DESCRIPTION
[0028] FIG. 1 shows an exemplary embodiment of a slot wedge 1 according to the disclosure. The slot wedge 1 has a stem region 2 and an engagement region 3 perpendicular thereto. In the example shown, the slot wedge 1 has a closure cap 4 which is attached to the stem region 2 and on which protrusions 5 are formed which serve to limit a creepage distance in a slot.
[0029] FIG. 2 shows the slot wedge 1 from FIG. 1 in a top view. The elements shown have already been explained in connection with FIG. 1. As can be seen here, the engagement region 3 is plate-shaped.
[0030] FIG. 3 shows a further exemplary embodiment of a slot wedge 1 according to the disclosure. The slot wedge 1 has a stem region 2 and an engagement region 3 perpendicular thereto. In the example shown, the slot wedge 1 has a closure cap 4 attached to the stem region 2. In the example shown, protrusions 6 are provided on the stem region 2, which serve to limit a creepage distance in a slot.
[0031] FIG. 4 shows the slot wedge 1 from FIG. 3 in a top view. The elements shown have already been explained in connection with FIG. 3. As can be seen here, the engagement region 3 is plate-shaped.
[0032] FIG. 5 shows stages of the closure of a slot 10 in connection with the introduction of a winding 20 into the slot 10. A slot 10 and the central axis 100 thereof are shown. The central axis 100 extends in the radial direction with respect to an electrical machine in the stator or rotor of which the slot 10 is provided; that is, the axis of rotation of the rotor of the electrical machine is perpendicular to the plane of the drawing. In stage A, a slot insulation material 11 is introduced into the slot 10, and a winding 20 is already arranged in the slot 10. In stage B, the slot insulation material 11 is deformed in such a way that regions 12 of the slot insulation material 11 are directed towards the central axis 100. In stage C, a slot wedge 1 of the type shown in FIG. 1 is inserted into the slot 10. Also shown schematically is a creepage distance 21 which is delimited by the protrusions 5 on the slot wedge 1. In the exemplary embodiment shown, the opening of the slot 10 is narrowed relative to the diameter of the slot 10. As a result, the closure cap 4 and thus the entire slot wedge 1 is held in the slot 10. However, it is also conceivable that there is no narrowing of the slot, but that the slot has a constant diameter, for example. In this case, the slot wedge could be held in the slot with a friction fit.
[0033] FIG. 6 shows stages of the closure of a slot 10 in connection with the introduction of a winding 20 into the slot 10. A slot 10 and the central axis 100 thereof are shown. The central axis 100 extends in the radial direction with respect to an electrical machine in the stator or rotor of which the slot 10 is provided; that is, the axis of rotation of the rotor of the electrical machine is perpendicular to the plane of the drawing. In stage A, a slot insulation material 11 is introduced into the slot 10, and a winding 20 is already arranged in the slot 10. In stage B, the slot insulation material 11 is deformed in such a way that regions 12 of the slot insulation material 11 are directed towards the central axis 100. In stage C, a slot wedge 1 of the type shown in FIG. 3 is inserted into the slot 10. Also shown schematically is a creepage distance 21 which is delimited by the protrusions 6 on the slot wedge 1. In the exemplary embodiment shown, the opening of the slot 10 is narrowed relative to the diameter of the slot 10. As a result, the closure cap 4 and thus the entire slot wedge 1 is held in the slot 10. However, it is also conceivable that there is no narrowing of the slot, but that the slot has a constant diameter, for example. In this case, the slot wedge could be held in the slot with a friction fit.
LIST OF REFERENCE NUMBERS
[0034] 1 Slot wedge [0035] 2 Stem region [0036] 3 Engagement region [0037] 4 Closure cap [0038] 5 Protrusions [0039] 6 Protrusions [0040] 10 Slot [0041] 11 Slot insulation material [0042] 12 Region (of the slot insulation material) [0043] 20 Winding [0044] 21 Creepage distance [0045] 100 Central axis (of the slot)
