DE1239773B - Folded windings for transformers, choke coils and similar induction devices are printed on a band-shaped carrier made of insulating material - Google Patents

Description

Folded windings printed on a strip-shaped carrier made of insulating material for transformers, reactors and similar induction devices cylinder windings made of round wire for transformers and the like are electrical induction devices as is known, predominantly either from layer coils or when using disc coils made up of single coils, double coils or departmental coils. With such windings must, if the layer or coil tensions have reached certain values, additional Insulations are introduced that the winding fill factor z. B. in network transformers worsen significantly. The known windings with disc-shaped windings are also disadvantageous Structure that the winding cannot be wound through in one go, but is composed of individual elements, the beginnings belonging together and ends of the coil sections must be soldered after assembly.

A smaller, lighter and cheaper construction would be for windings with small cable cross-sections e.g. B. in power transformers for high voltages (up to about 60 kV) and powers up to about 30 kVA when using one on a band-shaped Carrier printed foldable winding possible, which alternate from continuously to the outside and inwardly running Archimedean ladder spirals is formed. At a With such a winding, the lowest voltages occur between adjacent conductor turns on, so that on an additional insulation of the conductor besides that of the thin tape carrier on the one hand and thin insulation on the other can.

A printed folding winding is already known in which the carrier tape is printed on one side with two pairs of winding spirals running next to each other; The tape is then first folded lengthways in the middle and then like a Leporello folded. The production of the inner, d. H. the one passing through the two folded backing tape layers Connection of the successive winding spirals, which makes the use even more expensive Requires manual labor.

An induction coil is also known, which consists of an insulating material Spirally printed, sprayed or electroplated conductor material consists; Any number of such spirals can be found on flexible insulating tape attached on both sides, which form a coherent, uninterrupted line. By folding the insulating tape, an induction coil is finally formed, the inner end of an inwardly traversed ladder spiral on one side Side of the insulating tape through an opening with the inner end of the now after Conductive spiral on the other side of the insulating tape connected is.

When folded and pressed, this winding forms a compact one Block whose heat loss generated inside is diverted to the outer surfaces must become.

A significantly higher winding utilization is achieved with one on one Ribbon-shaped carrier made of insulating material, printed folding winding with the same folding pitch for transformers, reactors and the like induction devices achieved the from each pair of the same shape, connected together by a printed connection on the outside Spiral winding is made up in pairs on either side of the support around a pitch are offset and their inner ends by soldering directly and only between each other facing foil surfaces of the winding spirals in an opening in the carrier are connected to one another when, according to the invention, the carrier tape is folded with the State of overlapping breakthroughs outside of the spirals for formation is provided by cooling channels through which a cooling medium flows.

The continuous processing in the various consecutive Operations are made much easier, and the tolerances of the finished winding are much smaller if, according to a further inventive concept, the carrier tape is provided with a scannable division z. B. the edge perforation of a Film can be similar.

In Fig. 1 to 3 of the drawings is an embodiment of the invention shown.

F i g. Fig. 1 shows the one and Fig. 1 produced in a sequence. 2 the other side of the carrier tape printed on both sides; F i g. 3 shows finally the finished, but stretched, printed fold-over wrap.

The winding shown in the drawing is made as follows: A carrier strip 1 made of insulating material, about 0.15 mm thick, is on both edges perforated at 2 and another hole 3 for the later switching connection of the punched inner turns. The pre-punched carrier strip is one-sided with a Cu foil strip 4 laminated in such a way that the perforation at the edges is not covered. The strip laminated on one side is dosed with a Solder 5 is provided in the pre-punched hole 3 for making the circuit connection. Then the strip is also on the other side in the same way with a Cu foil strip 6 laminated. Now the inner circuit connections 7 by mutual heating the Cu foils are soldered by running the strip through hot rollers.

The prepared strip is double-sided according to a known method printed, the spiral shape of the winding of a spiral pair 8 always the same and the outer turns 9 are connected to one another via a printed bridge are.

After the strip has been printed and soldered, the openings 10 for the iron core and the cooling channels are punched into it. This also eliminates most of the superfluous Cu foils.

The strip is now etched using known methods. As a result, the carrier strip has spiral-shaped turns 11 on both sides, which are connected metallically in series.

In order to produce a winding (coil) from this »printed circuit«, the strip is insulated on both sides (by painting or insulating strips) and alternately folded at the pitch, in such a way that the hole parts congruent on top of each other and the connections of the outer turns in the inner folds come to rest.

All work stages can be carried out on the strip, which only runs through once one after the other - that is, in a sequence - carried out with appropriate devices will; it is possible to change some of the work steps in their sequence choose or summarize.

The double-sided perforated strips make it possible to control the workflow to steer precisely.

It is also easy to do on the outer turns of the finished Solder winding taps. The strip can also be perforated at the end be cut off. It is also possible to have several windings next to each other to print a carrier strip to e.g. B. after folding the strip several Get winding strands in one unit with the same amount of work.

Claims (3)

Claims: 1. On a strip-shaped carrier made of insulating material Printed folding winding with the same folding pitch for transformers, inductors and the like induction devices from each pair of the same shape, by a printed connection outside interconnected winding spirals, the pairs on both sides of the beam are offset by one pitch and their inner ends by soldering directly and only between the facing foil surfaces of the Winding spirals are connected to one another in an opening in the carrier, d a d u r c h g e -k e n n n z e i c h n e t that the carrier tape with in the folded state overlapping breakthroughs located outside the spirals to form cooling channels is provided. 2. Folded winding according to claim 1, characterized in that the carrier tape with a scannable division, e.g. B. perforation on the edges is provided. 3. Folded winding according to spoke 1 and 2, characterized in that a solder is pre-dosed in the opening of the carrier tape and the connection with the spiral coils on both sides is made by heating. Considered publications: German Auslegeschriften Nos. 1119 988, 1115 825; Swiss patent specification No. 376 572.