End turn arrangement
The invention relates to an end turn arrangement in a stator of a dynamoelectric machine. In order to reduce, in a simple fashion, the volume required for the end turns of the form-wound coils, the stator is formed of segments ( 1 ) that have a substantially circular arc-shaped cross-section and can be combined into a stator by adding one or more other segments ( 1 ) having the same design. Each segment ( 1 ) has recesses ( 6, 7 ), within which at least one first form-wound coil ( 3 ), which is bent outward in the radial direction of the stator in the region of the end turns, and at least one second form-wound coil ( 4 ), which is bent inward in the radial direction of the stator in the region of the end turns, are arranged in the form of a tiered winding.
1. A segment for a ring-shaped stator of a dynamoelectric machine, said segment having a substantially circular arc-shaped cross section and constructed for attachment to other said segments to form a stator, said segment having slots and comprising:
at least one first form-wound coil arranged in the slots and bent outwards in a radial direction of the stator in a region of end turns; and
at least one second form-wound coil arranged in the slots and bent inwards in the radial direction of the stator in the region of the end turns,
wherein the first and second form-wound coils are arranged in the form of a tiered winding, and
wherein the first and second form-wound coils are same design and laid in the slots in opposite directions.
2. The segment of claim 1 , further comprising at least one third non-bent form-wound coil which is arranged between the first and the second form-wound coils.
3. The segment of claim 1 , wherein each of the first and second form coils has a feed conductor and a return conductor, said feed conductor being arranged in a first one of the slots having slot flanks which are aligned parallel to slot flanks of a second one of the slots in which the return conductor is arranged.
4. The segment of claim 1 , wherein the slots point inwards as viewed in the radial direction of the stator.
5. The segment of claim 1 , wherein the slots point outwards as viewed in the radial direction of the stator.
6. A ring-shaped stator, comprising at least two segments, each said segment having a substantially circular arc-shaped cross section and having slots for arrangement of at least one first form-wound coil which is bent outwards in a radial direction of the stator in a region of end turns, and at least one second form-wound coil which is bent inwards in the radial direction of the stator in the region of the end turns, wherein the first and second form-wound coils are arranged in the form of a tiered winding, and wherein the first and second form-wound coils are same design and laid in the slots in opposite directions.
7. The stator of claim 6 , wherein the segment includes at least one third non-bent form-wound coil which is arranged between the first and the second form-wound coils.
8. The stator of claim 6 , wherein each of the first and second form coils has a feed conductor and a return conductor, said feed conductor being arranged in a first one of the slots having slot flanks which are aligned parallel to slot flanks of a second one of the slots in which the return conductor is arranged.
9. The stator of claim 6 , wherein the slots point inwards as viewed in the radial direction of the stator.
10. The stator of claim 6 , wherein the slots point outwards as viewed in the radial direction of the stator.
11. An electrical machine, comprising a ring-shaped stator which includes at least two segments, each said segment having a substantially circular arc-shaped cross section and having slots for arrangement of at least one first form-wound coil which is bent outwards in a radial direction of the stator in a region of end turns, and at least one second form-wound coil which is bent inwards in the radial direction of the stator in the region of the end turns, wherein the first and second form-wound coils are arranged in the form of a tiered winding, and wherein the first and second form-wound coils are of same design and laid in the slots in opposite directions.
12. The electric machine of claim 11 , constructed in the form of a wind power generator.
13. A wind turbine, comprising an electrical machine which includes a ring-shaped stator having at least two segments, each said segment having a substantially circular arc-shaped cross section and having slots for arrangement of at least one first form-wound coil which is bent outwards in a radial direction of the stator in a region of end turns, and at least one second form-wound coil which is bent inwards in the radial direction of the stator in the region of the end turns, wherein the first and second form-wound coils are arranged in the form of a tiered winding, and wherein the first and second form-wound coils are same design and laid in the slots in opposite directions.