SU750587A1 - Method of manufacturing ferromagnetic magnetic core - Google Patents

Description

one

The invention relates to electrical engineering, and specifically to methods for manufacturing spiral magnetic systems.

A known method of manufacturing spiral magnetic systems by cutting in a steel disk with a cutter or a cutter of spiral grooves into which the excitation winding is then laid in the form of an insulated strip of conductive metal 1 previously coiled into a spiral.

The disadvantages of this method are low labor productivity and low durability of the cutting tool, especially when cutting deep and narrow grooves, which is necessary when the strip of conductive metal, performing the functions of the excitation winding, has a relatively large width with a small thickness.

The choice of material for a magnetic core is limited by the requirement of its good machinability.

A method of manufacturing spiral magnetic systems is also known by making spiral grooves using an electroerosive method 2.

The disadvantages of this method are low process productivity and high consumption of complex and expensive tools.

In the methods described by sbiuie, the operation of laying an insulated strip into a spiral groove corresponding in shape and size is laborious and often accompanied by damage to the insulation.

The purpose of the invention is to simplify the manufacturing technology.

. The goal is achieved as follows.

The magnetic system of an electromagnet with a magnetic core in the form of a piece of ferromagnetic material, at the end of which there are spiral grooves filled with conductive metal covered with an electrical insulation layer forming the excitation winding, is formed by rolling out alternating strips — a strip of ferromagnetic material and a strip of conductive metal coated

2Q of electrical insulation, in a flat helix, and directed onto one of the end planes of the helix obtained layer of ferromagnetic material. In order to reduce the thermal effect of the metal melted during the surfacing process on the electrical insulation, a steel wire is laid in the process of rolling the helix from the end face to be deposited, and the welding is performed under the coolant layer in parallel with a strip of conductive metal coated with the process of surfacing. .

The drawing schematically shows the magnetic system in the process of surfacing.

The manufacture of the spiral magnetic system by this method is carried out in the following sequence.

A set consisting of steel strips 1 and, between them a copper strip 2, covered with a layer of electrical insulation 3 of glass-mica tape and two rows of steel wire 4 of circular or rectangular cross-section, is rolled into a flat spiral around the steel core 5, with which steel tapes 1 are pre-welded.

Then, a layer of steel 7 is deposited on the coil 6 by means of the welding head 8 of the electric arc welding machine. In order to protect the electrical insulation, the heat resistance of which usually does not exceed 600-800 ° C, from destruction due to overheating, inevitable if the thermal effect of the deposited layer of steel 7 heated to a high temperature on the lower layers of steel strips 1 and wire 4 will be long The surfacing is carried out under a layer of water 9, which serves as a cooling medium. In order to facilitate the initiation of the arc discharge, it is advisable to dissolve a small amount of sodium chloride in water. In the process of surfacing, electric arc 10 burns in a vapor-gas bubble 11, isolating it from water. The cladding is made by electrode wire 12, diameter 1.2. mm in the next mode;

Direct current, A180-200

Electrode departure, MY-24

Voltage on the arc-38-41

ge, b

The magnetic system of the sushch, the cavity 13 is filled with electrically insulating glue.

and after curing the glue, mechanical end treatment is performed.

The layer of the weld metal connects the turns of the spiral of ferromagnetic material into one, giving the necessary

strength and rigidity of the magnetic system. Coiling and surfacing can be performed automatically at a relatively high speed. The execution time of the operations is not significantly dependent on the ratio of the sizes of the winding strips and the properties of the applied

Claims (2)

1. Method of manufacturing a ferromagnetic magnetic core with spiral grooves at the end of the excitation winding by filling these grooves with conductive metal with metal pre-coating with electrical insulation, characterized in that, in order to simplify the manufacturing technology, the grooves are filled by rolling alternating strips of ferromagnetic material and a strip of coated electrical insulator the conductive metal into a flat helix and then welds on one D from the end planes of the helix obtained is a layer of ferromagnetic material. 2. A method according to claim 1, characterized in that, in order to increase the reliability by protecting the electrical insulation during the deposition of the metal in the process of coiling the spiral  On the side of the end face to be deposited, steel wire is laid in parallel with the strip of conductive metal, and the weld is produced under a layer of cooling fluid. 0Sources of information taken into account in the examination 1.Natent of Germany No. 2444834, cl. H 01 F 7/00, 1975. 2.Livshits, AL and others. Electropulse processing of metals, M., “Engineering, 1967 (prototype).