DE565685C - Magnetisable core that is divided for applying or introducing the winding - Google Patents

Description

Magnetizable core that is divided for applying or introducing the winding It is known the magnetizable cores used in telecommunications made of fine, powdery, magnetic material. This is what happens, for example in that magnetizable substances in powder form with the addition of insulating material and binders are brought into the desired shape using compression. In telecommunications technology, these magnetizable cores were very often ring-shaped chosen. However, the application of the electrical windings was in the ring shape associated with certain difficulties. To simplify the winding of the toroidal cores it has now been proposed not to press a toroid as a whole, but rather it made from two or more parts. One can then wrap the individual Make core parts on winding machines of the known simple design and the later put together core parts wound in this way to form a toroidal core.

For Pupin coils with a large time constant or also for transformers, which should have a short force line path are preferably used so-called Sheathed core coils. In these, the winding inside the core is arranged in such a way that that the core material surrounds the winding almost on all sides. The manufacture of the kernels of sheathed core coils made of pressed material is only possible if one uses the magnetizable Manufactures pressed parts from two or more shaped pieces, which after the introduction of the Windings are then put together.

In all of these subdivided coil cores, however, occur at the joints the core halves or core parts because of the inevitable small air gaps harmful ' Stray fields. They also have the magnetic resistance and thus the electrical properties depend to a considerable extent on those between the interfaces depending on the air gaps. Now change over time due to the Work of the press material as a result of material tension and the like the air gaps, so with it there is a considerable change in reluctance and thus again a change in the inductance and the stray fields at these air gaps connected. These changes are, if it is about pupin coils, for example, a major disadvantage for trouble-free telecommunications operation, in particular because because these changes can occur in an unpredictable manner.

According to the invention is now in a magnetizable core, the for the application or introduction of the winding is divided on the Parting surfaces the core parts applied a layer of a substance whose permeability is higher is than that of the core material. Because the magnetic resistance of this with the core mass intimately connected layers are very small, they form the magnetic lines of force there is no substantial resistance at the interfaces between the core parts, so that the harmful Influence of the air spaces or gaps between the interfaces practically becomes ineffective. With minor changes, the core shape as it changes over time can occur with such molding materials, there still remains a sufficient number of points of contact or contact surfaces between these layers of high permeability exist, so that no significant changes in the electrical Values can occur. These layers can be used to avoid eddy currents Choose as thin as possible and subdivide them in a known manner.

In the figures are some exemplary embodiments of such layers shown. In Fig. I, i and 2 are the two halves of a clad core coil magnetic pressing material, 3 are the coil windings inside the jacket core, q. and 5 are the layers of high permeability fabric, for example made of permalloy.

Fig. 2 shows a toroidal core coil, the core of which consists of two halves ii and i2 exists. At the dividing surfaces of the two core halves are to reduce the scattering layers 13, 14, i5 and 16 are attached. 17 and 18 are the two halves of the winding the coil.

One can create the high permeability layers in several ways Apply to the parting surfaces, for example so that the core in half pre-pressed Conditions with a thin permalloy layer, e.g. B. Permalloy powder or a Permalloy sheet is provided, and that the final pressing then takes place in which at the same time firmly connects the permalloy layer to the interface. But you can also do that First, finish pressing the core parts and then place thin Permalloy sheets on the core halves glue on or connect them intimately to the parting surfaces in another suitable way. If necessary, the thin layers of high permeability can be applied to the interfaces also apply electrolytically.

To avoid damaging stray fields on the outer surface of the cladding core coil To avoid this, you can cover this surface with a thin layer of a magnetic cover very well conductive material.

Claims (1)

PATENT ÄNSYRCJCFI: Magnetizable core, which is used to introduce the winding is divided, especially for telecommunication purposes, characterized by: that on the parting surfaces of the core parts a layer of a substance is applied whose permeability is higher than that of the core material.