SU476611A1 - Armored magnetic coil inductance - Google Patents

Description

one

The invention relates to the field of radio engineering, in particular to communications equipment.

Inductance coils are known with armor, for example ferrite, magnetic conductor, especially widely used in communications equipment.

The known magnetic core consists of two identical parts (cups), between the cores of which a non-magnetic (air) gap is provided. The latter is introduced to reduce the spread and increase the stability of the magnetic permeability of the core. The cores are made with a hole for insertion of the trimmer in order to change the inductance of the coil. The cups are glued together or can be joined in other ways.

The known armored magnetic core requires the obligatory use of a trimmer, since it is impossible to manufacture a coil for a given inductance with high accuracy without a trimmer. The trimmer serves to compensate for the magnetic permeability of the core during the manufacturing process and to accurately set the value of the inductance of the coil. Care of the magnetic permeability of the core occurs in the process of drying the glue line. The change in the thickness of the glue line, which occurs in the process of drying and artificially aging coils with an armored core, in addition to its own influence on the magnetic permeability of the core, leads to a change in the size of the air gap due to a change in the relative position of the cups.

The use of trimmer complicates the design of the coil.

In addition, in the known construction of the magnetic circuit, the air gap is located in the middle inaccessible for control and processing area. For this reason, the violation of the geometry of the gap and the impact of the crumb of magnetic material cannot be directly detected, but only indirectly: by the value and stability of the inductance of the coil.

The aim of the invention is to simplify the design while maintaining the possibility of adjusting the inductance of the finished coil, since the air gap in the proposed design can be changed after the gluing of the magnetic core; increase coil parameters stability, since the air gap and the glue line are placed perpendicular to each other, and the gap size does not depend on the thickness of the glue line: increase in wear, as the most common latent defect in coils with a known magnetic core is core core which cannot be detected in the process of manufacturing a magpto and an increase in specific inductance and quality, since the winding space with the same dimensions of the core is more than 5% due to the absence of ti in Kirk.

This goal is achieved by the fact that one cup of the magnetic core is made without core, the second cup has a solid core for the entire height of the core, and the non-magnetic gap is formed by the walls of the hole in the first cup and the core of the second cup.

FIG. 1 shows the proposed magnetic circuit; in fig. 2 and 3 - variants of the proposed magnetic circuit.

Part of the magnetic circuit 1 is made without a core with a hole 2, part of the magnetic circuit

3 made with solid core 4 for the entire height of the core. A non-magnetic gap 5 is formed between the walls of the hole 2 and the core 4.

In this design, the clearance is available processing and can be changed after gluing the cups.

In the second embodiment (Fig. 2) of the proposed design of the magnetic circuit, its part 1 in order to simplify the design of the core is made in the form of a disk with a hole 2, the wall of the part of the magnetic core with core 4 is respectively enlarged. A non-magnetic gap 5 is also formed between the walls of the hole 2 and the core 4 and is easily accessible for fitting.

In the third embodiment (Fig. 3) of the proposed design, part of the magnetic core with a core

4 is made without walls, and the walls of the part of the magnetic circuit 1 are respectively enlarged. A non-magnetic gap 5 is also formed between the walls of the hole 2 in the cup and the core 4 of the magnetic core 3. There is no trimmer made of magnetic material: the inductance of the coil and these cores can be changed after the gluing of the cups by changing the gap size.

H-Redmet Invention

Claims (3)

1. The armored magnetic core of an inductor with a nonmagnetic gap, containing two mutually coupled parts, one of which has a core, characterized in that, in order to reduce the structure and increase the stability of the core parameters. The core is made to the entire height of the core, the second part of the magnetic core is made without core, and a non-magnetic gap is formed between the core of the first part and the walls of the hole in the second part of the magnetic core. 2. Magnetic circuit according to claim 1, characterized in that part of the coreless core is made in the form of a disk with a hole. 3. Magnetic conductor according to claim I, characterized in that part of the coreless core is made in the form of a drag with walls to the entire core height. Fig 1 five