DE926621C - Rectangular or clad iron core made of strip-shaped material, especially for current transformers, and process for its manufacture - Google Patents

Description

Rectangular or jacket iron core made of strip-shaped material, in particular for current transformers, and process for their manufacture For the manufacture of iron cores Various methods are known for apparatus based on inductive action. The most common method is that the iron core consists of two-part, Punched sheets to be subsequently introduced into the finished bobbin will. Another method is to create the iron core from undivided sheet metal rings piled up. The winding must be wound onto the finished core. Furthermore, it is known that the iron core consists of a single continuous wire or Manufacture tape, the wire or tape with the necessary number of turns is introduced into the finished windings. But you can also here the other way round current-carrying wire windings retrospectively on the previously completed iron core wind up. It is also known that such an iron core does not consist of a single one Tape, but to be made from at least two tapes that are wound one after the other will. About the relatively difficult threading of the iron strip into the bobbin or to avoid winding the winding onto the previously finished tape core, it has already become known, one from a single volume wound tape core after taping perpendicular to the core plane at least cut open at one point and after pushing on the previously completed coils reassemble the cut lamellas by welding, soldering or the like, so that a closed iron core is created without a joint. Finally is too a process for the production of an iron core became known in which initially a tape core wound from a single tape, then this tape core is bandaged @ and_ then cut into two parts perpendicular to the core plane, so that there are two half-ring-shaped tape core parts, of which only one or both with another consisting of stacked sheets of iron core to form a single window or a jacket-shaped iron core.

The invention relates to a method for producing a rectangular or sheath iron core, in which first a tape core in the desired shape is wound from a single tape, then this tape core is bandaged and placed on it is cut perpendicular to the core plane. According to the invention, the core is divided into two Unequal parts cut up, then the bandaging removed and layered alternately The core is composed of the individual bands created in this way. A necessary one Post-annealing can be done after cutting before removing the bandage. Shell cores can be formed by two rectangular cores placed next to one another; It is advisable to use the bandaged cores that are bandaged by the two to offset the cuts to be laid against each other; one uses now with the mutual Layers for each half of the cladding core, individual strips from both rectangular cores, this results in an even more extensive offset of the joints with respect to one another. The iron band width is expediently chosen so that the core layer heights occurring in each case are divisible in whole numbers by the iron bandwidth, so that one and the same Eisenband can produce all core layer heights.

An iron core produced according to the invention has compared to the Iron cores with the previously customary stripe layering have the advantage that less Joints occur, and due to the lack of punching waste, there is a considerable amount of material is saved, which is particularly important when using expensive nickel iron alloys falls. Compared to cores wound from iron tape, the invention has the advantage that the cumbersome and time-consuming threading or pulling of the iron band by the bobbin or the equally cumbersome application of the winding the finished tape core or the subsequent welding or soldering of the for the latter application of the winding of the cut tape core is omitted.

On the basis of Fig. I and 2 is an example of the production of a rectangular and a jacket iron core according to the invention are explained. An iron band i i of sufficient length is, for example, more appropriate around a mandrel Lay around the shape so often that an iron core of the desired shape was created which is now bandaged so that it maintains its shape. Then the The resulting core is cut at the points marked 12 and 13 in Fig. 1a, so that two unequal U-shaped parts are created. If necessary, these two will Parts re-annealed and then the bandaging removed, so that a multitude of them can be obtained of individual bands iia, i i b, i ic etc. of different shapes. These as can be seen from Fig. i b, in the correct order, but below Relocation of the joints, layered in the relevant coil body.

If a jacket core is to be produced, two rectangular ones are required Cores produced in the manner described with reference to Figs. I a and i b and layered next to each other in the bobbin. As shown in Fig. 2 a is shown, the. one core at 14 and 15, the other at the Cut points 16 and 17. If you then layer the individual bands in the sequence shown in Fig. 2 apparent way, d. H. by taking for each half of the sheath core alternating individual bands from the two differently cut rectangular cores of Fig. 2a is used, there is a further offset or overlap of the joints. One can use this process to make rectangular ones as well Use cores, d. That is, the two halves of the casing core lying next to each other in Fig. 2b 3 are each used as rectangular cores. A more far-reaching one can also be found Enable relocation of the joints by building the cores from individual strips, which come from three or more differently cut ligament cores.

In current transformers with iron cores according to the invention also easily apply art circuits. For example, there is no problem to produce so-called half turns, d. H. Turns that are only half or generally only encompass part of the power flow by adding that number of turns simply between two adjacent individual bands with the insertion of Insulating material passes through. In the case of a cladding core, one can see the relevant turns also between the two adjacent individual bands of the two rectangular cores, from which the sheath core is composed, pass through. It is also possible if you put two cores on top of each other to achieve a certain core layer height, pulling the turns between these two core parts in order to do this to create so-called half turns.

Claims (3)

PATENT CLAIMS: i. Process for the production of a rectangular or clad iron core, in which first a tape core in the desired shape is wound from a single tape, then this tape core is bandaged and then cut perpendicular to the core plane, characterized in that the core is cut into two unequal parts , then the bandaging is removed and the core is put together by alternately layering the resulting individual bands. 2. The method according to claim i, characterized in that any necessary afterglow after cutting the strip cores before removal the bandaging takes place. 3. A method for producing a cladding core according to claim i, characterized in that it consists of two rectangular cores placed side by side is produced, the bandaged by the two associated tape cores The cuts to be laid are offset against one another, and that when they are reciprocal Layers for each half of the cladding core, individual bands from the two rectangular cores be used. . Iron core according to claim i, characterized in that the iron strip width is chosen so that the respective core layer heights occurring through the iron band width are divisible in whole numbers, so that all desired with one and the same iron band Core layer heights can be produced.