SUPPORTING DEVICE AND METHOD FOR SUPPORTING WINDING COILS IN A WIND TURBINE GENERATOR

Abstract

The device includes a flexible member that is in a relaxed, substantially concave configuration before being inserted between two adjacent stator portions, and in an operating, substantially flattened configuration when inserted between two adjacent stator portions in which the flexible member is compressed by the stator portions and the winding coils. The flexible member may be in an inserting, substantially convex configuration for being inserted between the adjacent stator portions.

Claims

1. A supporting device for supporting winding coils in a wind turbine generator, the device comprising: a flexible member configured to be attached between two adjacent stator portions of the generator, the flexible member being in a relaxed configuration before being inserted between the two adjacent stator portions, and the flexible member being in an operating configuration when inserted between the two adjacent stator portions in which the flexible member is compressed by the stator portions and the winding coils.

2. A supporting device according to claim 1, wherein the relaxed configuration of the flexible member is a substantially concave configuration.

3. A supporting device according to claim 1, wherein the operating configuration of the flexible member is a substantially flattened configuration.

4. A supporting device according to claim 1, further comprising a pre-tensioning tool that is configured to be applied to the flexible member for bringing it into an inserting configuration such that the flexible member can be inserted between the two adjacent stator portions.

5. A supporting device according to claim 4, wherein the inserting configuration of the flexible member is a substantially convex configuration.

6. A supporting device according to claim 4, wherein the pre-tensioning tool comprises two separate walls and a tightening element, wherein the separate walls are configured to push on opposite edges of the flexible member as the tightening element is tightened to the flexible member to bring the flexible member into the inserting configuration.

7. A supporting device according to claim 6, wherein the tightening element of the pre-tensioning tool is a screw adapted to be screwed on the winding coil coupling portion such that the walls of the pre-tensioning tool push on the flexible member.

8. A supporting device according to claim 1, wherein the flexible member has a coupling portion adapted to be at least partially inserted into a gap between adjacent winding coils when in the operating configuration.

9. A supporting device according to claim 8, wherein the winding coil coupling portion is adapted to be always in contact with adjacent winding coils.

10. A supporting device according to claim 8, wherein the winding coil coupling portion is movable with respect to the stator portions to adapt to the gap between adjacent winding coils.

11. A supporting device according to claim 8, wherein the winding coil coupling portion has at least one projection extending outwards to adapt to the gap between adjacent winding coils.

12. A method for supporting winding coils in a wind turbine generator, the method comprising the steps of: providing at least one supporting device according to claim 11 comprising a flexible member that is in a relaxed configuration, compressing the flexible member into an inserting configuration such that it can be arranged between two adjacent stator portions, inserting the flexible member between the two adjacent stator portions, and leaving the flexible member between the adjacent stator portions such that it is in an operating configuration in which the flexible member is compressed by the stator portions and the winding coils.

13. A method according to claim 12, wherein the flexible member compressing step is carried out through the use of a pre-tensioning tool that is configured to put the flexible member in the inserting configuration before being inserted between two adjacent stator portions.

14. A method according to claim 13, wherein the flexible member compressing step is carried out by tightening the pre-tensioning tool to the flexible member causing the separate walls of the pre-tensioning tool to push on transverse edges of the flexible member tending to put it into the inserting configuration.

15. A method according to claim 12, further comprising the step of removing the pre-tensioning tool from the flexible member once the flexible member has been fitted between adjacent stator portions and arranged in the operating configuration.

16. A method for supporting winding coils in a wind turbine generator, the method comprising the steps of: compressing a flexible member of a supporting device from a relaxed configuration into an inserting configuration such that the flexible member can be arranged between two adjacent stator portions of the generator; inserting the flexible member between the two adjacent stator portions; and leaving the flexible member between the adjacent stator portions such that it is in an operating configuration in which the flexible member is compressed by the stator portions and the winding coils.

17. A method according to claim 16, wherein the compressing step is carried out through use of a pre-tensioning tool that is configured to put the flexible member in the inserting configuration before being inserted between two adjacent stator portions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Particular examples of the present supporting device will be described in the following by way of non-limiting examples, with reference to the appended drawings, in which:

[0027] FIG. 1 is a sectional elevation of one example of a supporting device in a relaxed configuration;

[0028] FIG. 2 is a sectional elevation of the example of the supporting device in an inserting configuration before being inserted between two adjacent stator portions and provided with a pre-tensioning tool applied thereto;

[0029] FIG. 3 is a sectional elevation of the example of the supporting device in an operating configuration already inserted between two adjacent stator portions with the pre-tensioning tool being removed from the supporting device;

[0030] FIG. 4 is a sectional elevation of the example of the supporting device in which the flexible member and the winding coil coupling portion are separate pieces;

[0031] FIG. 5 is a sectional elevation of the example of the supporting device in which the winding coil coupling portion includes projecting portions; and

[0032] FIG. 6 is a sectional elevation of the example of the supporting device in which the flexible member is movably coupled to the stator portion.

DETAILED DESCRIPTION

[0033] In the figures, the supporting device has been indicated by reference numeral 100 as a whole. The supporting device 100 is intended for supporting winding coils 120, 121 in a wind turbine generator. The winding coils 120, 121 are shown in FIGS. 2-6 of the drawings.

[0034] According to the examples shown in the figures, the supporting device 100 has a flexible member 140 which in the example shown is a leaf spring made of a flexible and/or elastic material such as fiberglass or similar. Other materials are also possible as long as the flexible member 140 may be elastically deformed for being inserted between two adjacent stator portions 150, 151 while applying a force to the winding coils 120, 121 for fixing or retaining them into slots formed in the stator core of the generator (not shown). The support device 100 is adapted to be fitted between stator portions 150, 151 without interfering the air gap between the generator rotor and the generator stator (not shown).

[0035] Before the flexible member 140 is inserted between two adjacent stator portions 150, 151, the flexible member 140 is in a relaxed configuration as shown in FIG. 1, that is, in an uncompressed condition. In this condition, the flexible member 140 has a substantially concave configuration, that is, a configuration in which the flexible member 140 is curved inward like the inside of a circle or sphere as shown in FIG. 1.

[0036] As shown in FIGS. 2 and 3 of the drawings, the supporting device 100 also has a pre-tensioning tool 180. The pre-tensioning tool 180 includes a base 185 with separate walls 181, 182 and a tightening element 190. In the non limiting example of the pre-tensioning tool 180 shown in FIGS. 2 and 3 of the drawings, the tightening element has a screw 190 although other tightening means are possible. The screw 190 is adapted to be screwed on a threaded hole 130 formed in a winding coil coupling portion 160 of the flexible member 140. Thus, as the screw 190 is screwed on the threaded hole 130 of the flexible member 140, the base 185 of the pre-tensioning tool 180 approaches the flexible member 140 and its separate walls 181, 182 push on the flexible member 140. This deforms the flexible member 140 bringing it into the inserting configuration shown in FIG. 2 in which the flexible member 140 has a substantially convex configuration, that is, curved outward like the exterior of a circle or sphere as shown in FIG. 2, such that it can be arranged between two adjacent stator portions 150, 151.

[0037] After the flexible member 140 has been inserted between the two adjacent stator portions 150, 151, the flexible member 140 is in an operating configuration as shown in FIG. 3, that is, in a compressed condition. Specifically, in this condition the flexible member 140 is compressed by the stator portions 150, 151 and the winding coils 120, 121 of the wind turbine generator. In this compressed condition of the flexible member 140, the winding coils 120, 121 are actively supported in position while vibrations are reduced as a force is applied thereon by the flexible member 140 that is inserted in between. The winding coils 120, 121 are in turn prevented from falling down by the flexible member 140. In this operating configuration shown in FIG. 3, the flexible member 140 has a substantially flattened configuration, that is, a configuration in which the flexible member 140 is substantially flat, with no slopes or curvatures. Finally, in the operating configuration of the supporting device 100 shown in FIG. 3, a number of air channels are created between the winding coils 120, 121 and the flexible member 140. Air is allowed to pass through such channels enhancing cooling of the generator.

[0038] The above mentioned winding coil coupling portion 160 of the flexible member 140 may be adapted to be at least partially inserted into a gap 170 formed between adjacent winding coils 120, 121 when the flexible member 140 is in the operating configuration as shown in FIG. 3. The winding coil coupling portion 160 may be adapted to be always in contact with adjacent winding coils 120, 121. FIGS. 4-6 show examples of winding coil coupling portions 160 for achieving this. In the example shown in FIG. 4, the winding coil coupling portion 160 is a separate piece from the flexible member 140 which provides a self-centring feature of the coupling portion 160 with respect to the winding coils 120, 121. In the example of FIG. 5, the winding coil coupling portion 160 has projections 161, 162 extending outwards from the coupling portion 160 to the adjacent winding coils 121, 122 to adapt to the gap 170. In the example shown in FIG. 6, the supporting device 100, which includes a flexible member 140 and a winding coil coupling portion 160, is movable with respect to the stator portions 150, 151, so that the winding coil coupling portion 160 can adapt to the gap 170.

[0039] For supporting winding coils 120, 121 in the stator of a wind turbine generator, a number of the above described supporting devices 100 may be provided with their flexible member 140 in the relaxed, uncompressed configuration as shown in FIG. 1. A pre-tensioning tool 180 is applied to the flexible members 140 in order to bring them into the inserting configuration shown in FIG. 2. For this purpose, the screw 190 of the pre-tensioning tool 180 is screwed on the threaded hole 130 of the coupling portion 160 of the flexible member 140, thus causing the separate walls 181, 182 of the tool 180 to push on corresponding opposite edges 141, 142 of the flexible member 140 so that the flexible member 140 is elastically deformed into the inserting configuration shown in FIG. 2. In such inserting configuration, the flexible member 140 has a substantially convex configuration and can be inserted between adjacent stator portions 150, 151.

[0040] Then, the screw 190 of the pre-tensioning tool 180 is untightened from the threaded hole 130 of the coupling portion 160 of the flexible member 140 such that the separate walls 181, 182 of the tool 180 move away from the flexible member until the operating configuration shown in FIG. 3 is reached. In this configuration, the flexible member 140 is compressed by the stator portions 150, 151 and the winding coils 120, 121 so that it comes into contact with winding coils 120, 121.

[0041] Finally, the pre-tensioning tool 180 is removed from the flexible member 140 once properly fitted between the adjacent stator portions 150, 151.

[0042] In some cases, the pre-tensioning tool 180 could be left in the supporting device 100 with the screw 190 partially or totally unscrewed. This could be useful for example to adjust the degree of deformation of the flexible member 140 of the supporting device 100 over the time, if required.

[0043] Although only a number of particular examples of the present supporting device for supporting winding coils in a wind turbine generator have been disclosed herein, it will be understood by those skilled in the art that other alternative examples and/or uses and obvious modifications and equivalents thereof are possible.

[0044] For example, although the present supporting device has been described as suitable for wind turbine generators, the present supporting device may however be also applied to any other types of rotating electrical machines. Also, although the flexible member has been described in one example as a leaf spring made of a flexible and/or elastic material, other types of flexible members could be used as long as a suitable force is applied to the winding coils for retaining them in position in the stator core.

[0045] The present disclosure thus covers all possible combinations of the particular examples described and should not be limited by particular examples, but should be determined only by a fair reading of the claims that follow.