STATOR FOR AN ELECTRICAL MACHINE

Abstract

A stator constructed for an electrical machine and operable at an electrical power of at least 1 MW includes a hollow-cylinder-shaped stator yoke defining an axis and having a radially inner side formed with an open groove which extends in an axial direction. Disposed in surrounding relation to the stator yoke is a toroidal coil which includes a groove segment arranged in the open groove, a back segment arranged on a radially outer face of the stator yoke, and axial end faces, with each axial end face having a radial segment to connect the groove segment to the back segment.

Claims

1.-12. (canceled)

13. A stator for an electrical machine, said stator operable with an electrical power of at least 1 MW and comprising: a hollow-cylinder-shaped stator yoke defining an axis and having a radially inner side formed with an open groove which extends in an axial direction; and a toroidal coil disposed in surrounding relation to the stator yoke, said toroidal coil including a groove segment arranged in the open groove, a back segment arranged on a radially outer face of the stator yoke, and axial end faces, each said axial end face having a radial segment to connect the groove segment to the back segment.

14. The stator of claim 13, wherein the toroidal coil is configured as a former-wound coil.

15. The stator of claim 13, wherein the groove segment and/or the back segment is configured as a bar winding.

16. The stator of claim 13, wherein the groove segment and/or the back segment, together with the radial segments on the axial end faces, is configured as bar winding, said bar winding having an S shaped configuration in an area of the radial segments.

17. The stator of claim 15, wherein the bar winding is configured as a Roebel bar.

18. The stator of claim 13, wherein the toroidal coil has a winding start arranged on an outside and a winding end arranged on an inside of the toroidal coil, the winding start and the winding end each being arranged on the groove segment, on the back segment or on one of the radial segments.

19. The stator of claim 13, wherein the radial segment is configured in the axial direction in a V shape such that the groove segment is arranged completely in the open groove in a radial direction and the back segment rests against the radially outer face of the stator yoke.

20. The stator of claim 13, wherein the radial segment is configured in a circumferential direction in a V shape or a Z shape such that the groove segment is arranged completely in the open groove in a radial direction and the back segment rests against the radially outer face of the stator yoke.

21. The stator of claim 13, wherein at least two of said toroidal coil are arranged in the open groove.

22. The stator of claim 13, constructed in the form of a two-pole stator.

23. An electrical machine, comprising a stator operable with an electrical power of at least 1 MW, said stator including a hollow-cylinder-shaped stator yoke defining an axis and having a radially inner side formed with an open groove which extends in an axial direction, and a toroidal coil disposed in surrounding relation to the stator yoke, said toroidal coil including a groove segment arranged in the open groove, a back segment arranged on a radially outer face of the stator yoke, and axial end faces, each said axial end face having a radial segment to connect the groove segment to the back segment.

24. The electric machine of claim 23, wherein the toroidal coil is configured as a former-wound coil.

25. The electric machine of claim 23, wherein the groove segment and/or the back segment is configured as a bar winding.

26. The electric machine of claim 23, wherein the groove segment and/or the back segment, together with the radial segments on the axial end faces, is configured as bar winding, said bar winding having an S shaped configuration in an area of the radial segments.

27. The electric machine of claim 25, wherein the bar winding is configured as a Roebel bar.

28. The electric machine of claim 23, wherein the toroidal coil has a winding start arranged on an outside and a winding end arranged on an inside of the toroidal coil, the winding start and the winding end each being arranged on the groove segment, on the back segment or on one of the radial segments.

29. The electric machine of claim 23, wherein the radial segment is configured in the axial direction in a V shape such that the groove segment is arranged completely in the open groove in a radial direction and the back segment rests against the radially outer face of the stator yoke.

30. The electric machine of claim 23, wherein the radial segment is configured in a circumferential direction in a V shape or a Z shape such that the groove segment is arranged completely in the open groove in a radial direction and the back segment rests against the radially outer face of the stator yoke.

31. The electric machine of claim 23, wherein at least two of said toroidal coil are arranged in the open groove.

32. The electric machine of claim 23, wherein the stator is constructed in the form of a two-pole stator.

33. A mill or a compressor, comprising an electrical machine, said electric machine comprising a stator operable with an electrical power of at least 1 MW, said stator including a hollow-cylinder-shaped stator yoke defining an axis and having a radially inner side formed with an open groove which extends in an axial direction, and a toroidal coil disposed in surrounding relation to the stator yoke, said toroidal coil including a groove segment arranged in the open groove, a back segment arranged on a radially outer face of the stator yoke, and axial end faces, each said axial end face having a radial segment to connect the groove segment to the back segment.

Description

[0054] The invention will be described and explained in greater detail below on the basis of the exemplary embodiments shown in the figures, in which:

[0055] FIG. 1 shows a first exemplary embodiment of the proposed stator,

[0056] FIG. 2 shows a segment of a second exemplary embodiment of the proposed stator,

[0057] FIGS. 3-6 show a group of third exemplary embodiments of the proposed stator,

[0058] FIGS. 7-8 show a group of fourth exemplary embodiments of the proposed stator,

[0059] FIGS. 9-10 show a group of fifth exemplary embodiments of the proposed stator,

[0060] FIG. 1 shows a first exemplary embodiment of the proposed stator. The stator has a hollow-cylinder-shaped stator yoke 1 with a stator axis 12 and a number of open grooves 2, which are each arranged on the radial inner side 3 of the stator yoke 1 which each extend in the axial direction. A stator tooth 13 thus remains in each case between two neighboring grooves 2. The stator in this case is designed for operation with an electrical power of at least 1 MW.

[0061] Furthermore the stator has a number of toroidal coils 4, which each surround the stator yoke 1. A few of the toroidal coils 4 will merely be indicated in FIG. 1 in this case. The respective toroidal coil 4 has a groove segment 5 in each case, which is arranged in the respective groove 2. The respective toroidal coil 4 also has a back segment 6 in each case, which is arranged on the radially outer face 7 of the stator yoke 1. In addition the respective toroidal coil 4 has a radial segment 9 on each of the two axial end faces 8, which connects the respective groove segment 5 to the respective back segment 6.

[0062] The respective toroidal coil 4 can be embodied as a former-wound coil for example. As an alternative the respective groove segment 5 and/or the respective back section 6 can be embodied as a bar winding, which can be embodied for its part as a Roebel bar in each case.

[0063] FIG. 2 shows a section of a second exemplary embodiment of the proposed stator, wherein a section along the stator axis 12 is depicted. In this figure the same reference characters as in FIG. 1 refer to the same objects.

[0064] The groove segment 5 of the toroidal coil 4 is designed as a bar winding. In addition the back segment 6 and also the two radial segments 9 together are designed as a bar winding, for which purpose the bar winding is embodied in the shape of an S in the area of the respective radial segment 9. The two bars of the toroidal coil 4 are suitably electrically connected to one another at the two axial end faces 8 by means of a respective connection element 14.

[0065] Preferably the respective bar winding is embodied as a Roebel bar. In order to make cost savings however, just one of the respective bar windings can also be embodied as a Roebel bar, while the other of the respective bar windings can be designed without subconductor twisting.

[0066] FIGS. 3-6 show a group of third exemplary embodiments of the proposed stator, wherein, in a similar manner to FIG. 2, a longitudinal section 12 is depicted. The toroidal coil 4 has a winding start 10 arranged on the outside and a winding end 11 arranged on the inside in each case.

[0067] In the embodiment according to FIG. 3 the winding start 10 is arranged on one of the radial segments 9 and the winding end 11 on the back segment 6. By contrast, in the embodiment according to FIG. 4, the winding start 10 is arranged on the groove segment 5 and the winding end 11 on the back segment 6. The embodiments according to FIGS. 5 and 6 make provision for both the winding start 10 and also the winding end 11 to be arranged on the back segment 6. In the embodiment according to FIG. 5 the winding start 10 and the winding end 11 are arranged in this case on the respective axial end, while by contrast, in the embodiment according to FIG. 6, the winding start 10 and the winding end 11 are each arranged in the region of the axial center.

[0068] FIGS. 7 and 8 show a group of fourth exemplary embodiments of the proposed stator, wherein, in a similar manner to FIG. 2, a longitudinal segment 12 is depicted.

[0069] The design of the toroidal coil 4 is indicated in these figures by the dashed line, before its two radial sections 9 have been embodied in a V shape or a U shape. Before the deformation or drawing the toroidal coil 4 has an essentially rectangular cross-section. Through the deformation or drawing the respective radial segment 9, as shown in FIG. 7 or FIG. 8, will be embodied in a V shape or a U shape in the axial direction, such that the groove segment 5 is arranged in the radial direction completely in the groove 2 and the back segment 6 rests against the radially outer face 7 of the stator yoke 1.

[0070] FIGS. 9 and 10 show a group of fifth exemplary embodiments of the proposed stator.

[0071] The design of the toroidal coil 4 is indicated in these figures by the dashed line, before its two radial sections 9 have been embodied in a V shape or a Z shape. Before the deformation or drawing the toroidal coil 4 has an essentially rectangular cross-section. By the deformation or drawing the respective radial segment 9, as shown in FIG. 9 or FIG. 10, will be embodied in a V shape or a Z shape in the axial direction such that the groove segment 5 is arranged in the radial direction completely in the groove 2 and the back segment 6 rests against the radially outer face 7 of the stator yoke 1.

[0072] In summary the invention relates to a stator for an electrical machine, wherein the stator is able to be operated with an electrical power of at least 1 MW, wherein the stator has a hollow-cylinder-shaped stator yoke and at least one open groove, which is arranged on the radially inner face of the stator yoke and which extends in the axial direction in each case. The invention further relates to an electrical machine having a stator of this type. Finally the invention relates to a mill or a compressor having such an electrical machine. In order to develop such a stator or such an electrical machine in such a way as to overcome the disadvantages of the prior art previously described, at least one toroidal coil is proposed, which surrounds the stator yoke in each case, wherein the at least one toroidal coil has a groove segment in each case, which is arranged in the respective groove, wherein the at least one toroidal coil has a back segment in each case, which is arranged on the radially outer face of the stator yoke, and wherein the at least one toroidal coil has one radial segment per axial end face, which connects the respective groove segment to the respective back segment. Furthermore an electrical machine having such as stator and also a mill or a compressor having such an electrical machine will be proposed.