Abstract
A winding arrangement has a number of winding sections arranged one above the other in the axial direction. The winding sections are arranged at a distance from each other and are electrically interconnected such that they form a series connection. The winding arrangement allows vertical potting with a winding insulation. At least one foot element is provided, which is connected to a winding section and is configured to carry the entire winding arrangement.
Claims
1-19. (canceled)
20. A winding arrangement, comprising: a plurality of winding sections arranged one above another in an axial direction; said winding sections being spaced with respect to one another and electrically connected to one another so as to form a series circuit; and at least one foot element connected to one of said winding sections and configured to support the winding arrangement in its entirety.
21. The winding arrangement according to claim 20, comprising a winding insulator formed of a solid winding insulating material surrounding said winding sections and said at least one foot element at least in part.
22. The winding arrangement according to claim 21, wherein said winding insulating material includes a resin.
23. The winding arrangement according to claim 20, wherein said foot element comprises an insulating material section formed of an electrically insulating foot insulating material.
24. The winding arrangement according to claim 23, comprising a winding insulator formed of a solid winding insulating material at least in part surrounding each said winding section and said at least one foot element, wherein a coefficient of thermal expansion of said winding insulating material equals a coefficient of thermal expansion of said foot insulating material.
25. The winding arrangement according to claim 23, wherein said insulating material section extends from the one winding section to a free end region, and wherein the end region is configured to receive and support the winding arrangement.
26. The winding arrangement according to claim 20, which comprises a holding device having at least one holding element that extends between at least two mutually adjacent winding sections, wherein the one holding element is fixedly connected to said winding sections into which said holding element extends.
27. The winding arrangement according to claim 26, wherein said at least one holding element is one of a plurality of holding elements each being a planar insertion strip.
28. The winding arrangement according to claim 27, wherein each said holding element is embodied from a resin that is reinforced with fibers.
29. The winding arrangement according to claim 28, wherein each said winding section comprises winding layers that are wound one above another, and wherein said winding layers are insulated with respect to one another and comprise an electrical conductor.
30. The winding arrangement according to claim 29, which comprises layer connecting devices fixedly connecting said winding layers to one another.
31. The winding arrangement according to claim 30, wherein said winding sections are fixedly connected to one another by way of a cured resinous connection.
32. The winding arrangement according to claim 31, wherein each said winding section is circumferentially closed, and wherein said winding sections are arranged flush with respect to one another.
33. The winding arrangement according to claim 32, wherein said foot element and each said winding section are completely embedded in a winding insulator.
34. The winding arrangement according to claim 33, wherein said winding insulator is disposed to delimit an inner hollow space and a continuous inner wall of winding insulating material is disposed between said inner hollow space and each winding section, and wherein said continuous inner wall has a thickness between 1 mm and 50 mm.
35. A method of producing a winding arrangement, the method comprising: forming winding sections by winding winding layers onto a winding carrier, the winding layers being electrical conductors that are insulated from one another; connecting the winding sections to one another via holding devices to provide a winding arrangement with winding sections that are arranged one above another in an axial direction; connecting an end-side winding section to at least one foot element that includes a foot insulating section; casting each winding section and the at least one foot element in an upright position with an insulating material; and heating the insulating material so as to cure the insulating material.
36. The method according to claim 35, wherein the step of connecting the winding sections comprises inserting at least one holding element between the winding layers during the step of winding the winding sections, to cause the holding element to extend between at least two winding sections.
37. The method according to claim 36, which comprises causing the winding layers to adhere to one another by way of a resin that is not completely cured prior to curing the insulating material.
38. The method according to claim 37, which comprises preheating the winding arrangement after adhering the winding layers and after introducing the holding elements, but prior to curing the insulating material.
Description
[0026] Further expedient embodiments and advantages of the invention are the subject matter of the following description of exemplary embodiments of the invention with reference to the figures of the drawing, wherein identical reference numerals refer to identically-functioning components and wherein
[0027] FIG. 1 illustrates a perspective view of a winding arrangement from below,
[0028] FIG. 2 illustrates a perspective view of a foot element,
[0029] FIG. 3 illustrates a further exemplary embodiment of a foot element,
[0030] FIG. 4 illustrates a further exemplary embodiment of the winding arrangement in accordance with the invention prior to the casting procedure with fluid winding insulating material,
[0031] FIG. 5 illustrates an exemplary embodiment of the winding arrangement after the casting procedure and
[0032] FIG. 6 illustrates schematically an exemplary embodiment of the method in accordance with the invention.
[0033] FIG. 1 illustrates an exemplary embodiment of the winding arrangement 1 in accordance with the invention in a perspective view from below. It is apparent that the winding arrangement 1 comprises a number of disk windings 2, 2b, 2c . . . 2n that are arranged one above the other in a vertical or axial direction, wherein the disk winding 2a is limb the lower disk winding of the winding arrangement 1. It is apparent that the disk winding 2a and also incidentally all the other disk windings 2b . . . 2n are combined from multiple winding layers 3 that comprise a band-shaped, in other words planar, conductor that is wound from the interior towards the outside, wherein the respective disk winding 2a, 2b, 2c . . . 2n increases in size in the radial direction 4. The band-shaped conductors are insulated with respect to one another. The insulation is provided in the exemplary embodiment that is illustrated in FIG. 1 by means of a coating layer that is applied to the conductor. It is apparent in FIG. 1 that the disk winding 2a forms a recess 5 that is configured so as to receive a fastening end of a foot element.
[0034] FIG. 2 illustrates an exemplary embodiment of a foot element 6 that comprises a fastening end 7 and also a placing end 8 that is remote from the fastening end 7. An insulating material section 9 that is embodied from an insulating material such as for example an epoxy resin extends between the fastening end 7 and the placing end 8. The foot element 6 forms an inserting support 10 on the fastening end 7, said inserting support being configured so as to be inserted into the recess 5 that is illustrated in FIG. 1. The inserting support is molded in this illustrated example onto the insulating material section 9 and is likewise embodied from a resinous insulating material. A metal assembly means is embedded in the insulating material section 9 on the fastening end 8. The metal assembly means is provided with an inner thread.
[0035] FIG. 3 illustrates a further exemplary embodiment of a foot element 6 in accordance with the invention that comprises a foot element 6 and a placing end 8 as illustrated in FIG. 2. As illustrated in FIG. 2 the placing end 8 is provided with metal assembly means that comprise an inner thread in order to be able to securely screw the foot element 6. In contrast to the conical-shaped insulating material section 9 of the exemplary embodiment that is illustrated in FIG. 2, the insulating material section 9 is configured in this case in a cross-shaped manner and comprises two lower sections 11 and 12 that are arranged at a right angle with respect to one another. The lower sections 11 and 12 comprise in each case placing surfaces 13 and 14 that are arranged flush with respect to one another and that are provided so as to receive the lowest disk winding 2a of the winding arrangement 1. It is thus no longer necessary to provide a recess in the lowest disk winding.
[0036] FIG. 4 illustrates the foot element 6 that is illustrated in FIG. 3 having the disk windings 2a, 2b . . . 2n that are stacked one above the other and that are all wound together on a winding carrier 15 as holding means and are held on said winding carrier by means of tensile force. The disk windings 2a . . . 2n and also the winding carrier 15 together rest on foot elements 6 that in each case are placed in a concavity of a casting mold 16. After placing said foot elements, the winding carrier may be removed. The blank that is illustrated in FIG. 4 is cast upright using an electrically insulating resin, with the result that the entire winding arrangement 1 including the foot elements 6 is completely embedded in resin. The foot elements 6 extend therefore after the casting procedure into a casting foot that is already considered a part of the prior art, however said casting foot has been crucially improved in this case by virtue of the foot elements for supporting the winding arrangement prior to the casting procedure. In other words, the resinous insulating material provides the necessary rigidity for holding the winding arrangement. The winding arrangement 1 that is illustrated in FIG. 4 is used by way of example as a high voltage winding of a transformer, wherein a low voltage winding and also a limb of a magnet core extend into the interior of said transformer.
[0037] Furthermore, in addition to the winding carrier 15, the winding arrangement 1 comprises further holding elements 26 in the form of annular spacers 26. In contrast to the illustrated exemplary embodiment, the holding means may also comprise holding blocks that are configured as block-shaped. These mentioned holding elements may also provide the necessary holding arrangement for the winding sections without the winding carrier 15, with the result that the winding carrier 15 may be removed.
[0038] FIG. 5 illustrates schematically a transformer 17 having a limb 18 of an iron core and also a low voltage winding 19 and an exemplary embodiment of a winding arrangement 1 in accordance with the invention and said winding arrangement is used as a high voltage winding. It is apparent that holding elements 20a and 20b extend as holding means between the disk windings 2a, 2b . . . , 2n. The holding elements 20a and 20b are in each case configured as planar insertion strips and extend in each case through all the disk windings 2a, 2b, 2n of the winding arrangement 1. Moreover, the winding layers 3 of each winding section 2a, 2b, 2n are apparent in FIG. 5. In the exemplary embodiment that is illustrated in FIG. 5, the winding layers 3 are wound from an inner side, which is facing the limb 18, in the radial direction 21 towards the outside. As the number of winding layers 3 increases, each winding section 2a, . . . , 2n therefore increases outward in size. The holding means 20a and 20b extend between the winding layers 3 and are fixedly connected to said winding layers, with the result that the winding sections 2a, . . . , 2n are held by the holding elements 20a and 20b at a spacing with respect to one another. For this reason, it is possible to cast the winding insulating material in fluid form with the winding sections 2a, 2b, . . . , 2n and subsequently to completely cure the winding insulating material by means of heating under a vacuum, with the result that a dry winding 1 is provided as a winding arrangement, the winding sections of said winding arrangement being completely embedded in a fixed winding insulator 22. Moreover, it is apparent in FIG. 5 that the winding layers extend in an annular manner in a horizontal layer with the result that the winding sections 2a, 2n provide so-called disk windings. The disk windings 2a, 2n are circumferentially closed, with the result that the limb 18 together with the low voltage winding 19 extends in the interior of each disk winding 2a, 2n.
[0039] FIG. 6 illustrates the procedure of winding the winding section 2b. It is apparent that a metal band conductor 23 is wound together with an insulating foil 24 onto an already wound winding layer of the winding section 2b. Initially, the insertion strip 20a is inserted as a holding means. The insertion strip 20a is a pre-preg and is embodied from a fiber glass reinforced resin. The resin of the insertion strip 20a is not completely cured. The holding element 20a that is wound in this manner is preheated after the holding element 20b has been wound into a subsequent winding layer, with the result that a fixed connection is provided between the respective winding sections or disk windings 2a, 2n and the pre-pregs. The winding carrier 15 may subsequently be removed, wherein the holding elements 20a and 20b may hold the disk windings 2a and 2b . . . 2n without a winding insulation 22 at a spacing with respect to one another.
[0040] Furthermore, it is apparent that the insulating foil 24 comprises diamond-shaped regions 25 in which said insulating foil is impregnated or coated with a resin in the B-state. The diamond-shaped regions 25 are provided on the two sides of the insulating foil 24, wherein the resin is applied in a punctiform manner in the diamond-shaped regions. During the curing procedure after the winding procedure, the foils 24 adhere the band conductors 23 to one another. The resin in the diamond-shaped regions also cures by means of the preheating procedure, with the result that the aforementioned connection between the winding layers 3 is reinforced. The resin in the diamond-shaped regions may therefore be referred to as layer connecting means.
