Metal working – Method of mechanical manufacture – Electrical device making
Patent
1993-09-21
1996-12-31
Ledynh, Bot L.
Metal working
Method of mechanical manufacture
Electrical device making
296021, 29606, H01F 706
Patent
active
055882013
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to processes for producing a cast resin coils,and more particulary to a cast resin coil that consists of a plurality of flat coils superimposed axially on each other, and a cast resin coil thus produced.
German Utility Model 71 26 814 discloses a winding for a transformer which consists of axially superimposed individually wound flat coils. The individual flat coils have intervening spaces between their inner and outer partial windings which lie coaxially one within the other. The partial windings can be wound continuously from the same conductors. The intervening spaces of the corresponding flat coils form, in this connection, axial cooling channels. The winding can be encapsulated in casting resin. It has been found in practice that the encapsulating of the flat coils is very problematical. No solution for this problem is indicated in the German Utility Model.
Up to the present time, therefore, an inner cast resin coil and an outer cast resin coil were produced separately, then placed coaxially one within the other and mechanically connected to each other so that a concentric cooling channel was present between the two cast resin coils.
From U.S. Pat. No. 4,129,938 a process is known for producing an encapsulated winding of wire conductor having cooling channels. For this purpose, after a predetermined number of inner windings, an impregnable non-woven fabric is first of all placed on the winding. Thereupon, moldings which form cooling channels are placed on and an additional layer of the impregnable non-woven fabric is placed over this. An outer partial winding is then applied. The entire winding is encapsulated, the moldings being removed after the encapsulation. Axial cooling channels which are distributed uniformly over the circumference are then produced in the winding. This known winding technique, however, cannot be used in an arrangement consisting of a plurality of flat coils, since the moldings used in the individual flat coils were difficult to remove. Furthermore, the alignment of the intervening spaces of the individual flat coils with respect to each other is difficult.
From British 936 380, there is known the use of a non-woven fabric and of moldings for the forming of cooling channels for transformer coils.
The exact development of the coil, particularly in the transfer region of the coaxially arranged individual coils, is not taken up in any of the documents mentioned.
The present invention is directed to the problem of developing an improved process for producing windings that have cooling channels and are built of several flat coils. The present invention is also directed to the problem of developing an improved cast resin coil with strip conductors.
SUMMARY OF THE INVENTION
The present invention solves the first problem; producing flat coils by winding a first winding consisting of one or more conductors, and then winding one or more additional partial windings on the first winding, wherein the one or more partial windings are wound continuously from the same conductor, or conductors; using individual spacers to form sector-shaped intervening spaces; axially superimposing the flat coils and aligning the sector-shaped intervening spaces, thus forming axial cooling channels; disposing at least one molding into each cooling channel; encapsulating the superimposed flat coils, wherein the thus encapsulated individual spacers form stiffening webs between the partial windings; removing the moldings from the cooling channels; and applying a layer of impregnable material to the partial windings before encapsulating them, at least in the circumferential sections lying between the spacers, wherein the transfer of the conductor or conductors from the first partial winding to the one or more additional partial windings occurs in a connecting web between two adjacent spacers. In this way, a practical process is provided by which the cast resin coil can be produced. A coil produced by this process is characterized by high mechan
REFERENCES:
patent: 3668583 (1972-06-01), Nichols
patent: 3708875 (1973-01-01), Martincic et al.
patent: 4129938 (1978-12-01), Hagenbucher
patent: 4488134 (1984-12-01), Pfeiffer
patent: 4588972 (1986-05-01), Harumoto et al.
patent: 5034716 (1991-07-01), Mouadam
patent: 5097241 (1992-03-01), Smith et al.
patent: 5296829 (1994-03-01), Kothmann et al.
patent: 5461772 (1995-10-01), Puri
Alber Friedrich
Dedelmahr Rudolf
Jungnitz Winfried
Schott Hans
Sesterheim Heinz
Ledynh Bot L.
Siemens Aktiengesellschaft
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