Electrical winding for a transformer, a choke coil or the like

Details Electrical winding for a transformer, a choke coil or the like Electrical winding for a transformer, a choke coil or the like

1981-06-09

1983-07-26

Grimley, A. T.

Inductor devices

Windings

Having conductor of particular shape

336187, 336232, H01H 8500

Patent

active

043956939

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to an electrical winding for a transformer, a choke coil or the like wherein the conductor forming the winding is subdivided in the radial direction into n subconductors and, within the winding, the subconductors are twisted in such a manner that the initially innermost subconductor, after twisting, becomes the outermost subconductor, the second most inwardly disposed subconductor, after twisting, becomes the second most outwardly disposed subconductor, etc.
2. Description of the Prior Art
It is known from German Pat. No. 902,042 and from Richter, "Electrical Machines III", published by Birkhauser Verlag, 1963, pages 208-209, to subdivide in the radial direction the conductor forming the winding and in the course of the winding twist the subconductors in such a manner that the initially outermost subconductor, after twisting, comes to lie innermost, the subconductor initially lying in the second most outward position, after twisting, comes to lie at the second most inward position, etc. In both cases, the reason for doing this is stated to be a reduction of eddy current losses.
It is the object of the invention to provide a tape winding in which a plurality of superposed tapes, whose ends are connected electrically in parallel, form the conductor with such twisting that the winding operates essentially without losses.


SUMMARY OF THE INVENTION

This problem is solved in that during forming of the subconductors into conductor tapes, the subconductors 1 through (n-1) include two partially overlapping tape sections which are conductively connected together at their lateral edges in the overlap region, that the n.sup.th conductor tape is made of one piece and forms one of the outwardly disposed subconductors of the conductor, that the conductor tapes 2 through n are laced through between the overlapping tape sections of the first subconductor, that the conductor tapes 3 through n are laced through between the overlapping tape sections of the second subconductor, etc. until finally, the n.sup.th tape is laced through between the overlapping tape sections of the (n-1).sup.th conductor.
In order to avoid excess "bulk" in the winding at one point, the regions of overlap are preferably offset somewhat with respect to one another in the direction of winding.
Favorably, the region of overlap is selected of such a width that the conductive connection between the overlapping tape sections corresponds approximately to the width of the conductor and thus there will be no significant increase in ohmic resistance due to the configuration of the tapes.
The basic idea of the conductor design can be realized in practice in various ways. In one possible way, two tape sections are permitted to overlap during the production of the first through (n-1).sup.th conductor tapes and these two tape sections are connected along one lateral edge of the tape in the overlap region.
According to another possible solution, the first through (n-1).sup.th conductor tape are initially folded about an edge which is inclined by 45.degree. with respect to the winding direction; then the folded portion is folded again in a further fold about an edge inclined by 45.degree. with respect to the direction of winding so that the folded conductor tape again extends in the winding direction, but is offset by about one tape width, finally, by folding the offset portion about the lateral edge of the tape in the overlap region back into the path of the winding, the desired tape configuration is realized.
According to a third possibility, the first through (n-1).sup.th conductor tapes are each produced in that in a tape of double width two regions are produced, by cutting away or the like of one-half a tape width, with the conductor tapes offset with respect to each other by one tape width. These two regions must in part overlap and then the one tape region is folded by 180.degree. in the direction of winding about the edge connecting the two regions.
In all three cases, a continuou

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patent: 1629462 (1927-05-01), Palueff
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patent: 4262163 (1981-04-01), Durrell et al.

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