SU448550A1 - A method of manufacturing a printed winding of an electrical machine - Google Patents

Description

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This invention relates to a process for the manufacture of printed windings for electrical machines, in particular, to the production of printed windings with a ferromagnetic core of an interconducting space.

Methods are known for manufacturing a printed winding of an end electrical mantina by depositing on a conductor material bonded to the substrate by means of an adhesive, a winding circuit, removing the conductive material from the non-conductive part of the winding and filling the space between the conductors with a ferromagnetic filler, followed by sintering.

However, in windings made by a known method, the conductors are rigidly connected to the insulating base. The insulating base constitutes a significant part of the total thickness of the active layer of the printing winding, which leads to an increase in the masking air gap, and to a deterioration of its energy and weight parameters. This is especially significant for. Maschin with multilayer windings. : .. /: .. ..;;.: ;;,: „..; ; ::.;

The aim of the invention is to reduce the effective air gap of the machine by obtaining a monolithic winding that does not contain a base. .- - This is achieved by the fact that

In the method, the conductor material is bonded to the substrate with a low-melting adhesive, the ferromagnetic aggregate is molded and sintered in a mold at a temperature higher than the temperature of the adhesive, and after the aggregate is cured, the substrate is removed. The proposed method can be carried out as follows.

A layer of glue solution with the melting point of the drying glue line is not higher than 110 ° C on the degreased surface of the technological substrate. The adhesive must be resistant to the effects of etching solutions used to etch the conductive material, for example, to the effects of ferric chloride solution. A solution of polystyrene in toluene or xylene can be used as such an adhesive.

Conductive material of the required thickness is applied to the layer of glue and held under pressure until the glue joint is completely dry.

The production of a winding pattern is generally accepted. for the manufacture of printed. PCBs, including, the operation of applying the photosensitive layer, exposure and etching of the conductor layer. At. this is essential to ensure the safety of the adhesive layer and the substrate.

In the resulting winding, the free spaces between the conductors are filled with a ferromagnetic material, which is a mixture of fine iron powder with an uncured phenol formaldehyde resin or another polyorganic binder with a setting temperature of 120-140 ° C, i.e. above the fracture temperature of the glue line.

For filling, the winding is placed in the die matrix, which ensures the protrusion of the ferromagnetic core above the plane of conductors.

The sintering and curing of the ferromagnetic aggregate is carried out in a hot mold. For the phenol formaldehyde binder, the heating temperature is 130-160 ° C, holding 10-30 minutes. In order to avoid sticking of the filler, the surfaces of the die and punch are lubricated with anti-adhesive lubricant.

In the process of heat treatment, the aggregate hardens and forms a solid monolithic connection with the winding conductors.

The adhesion strength of the aggregate with the conductors contributes to the rough surface of the side edges of the conductors obtained by chemical etching.

After curing in a hot condition, the mold is opened and the technological substrate is separated. The substrate is easily separated from the winding, since during the heat treatment process the low-temperature adhesive joint is destroyed.

Subject invention

A method of manufacturing a printed winding of an end electrical machine by applying to a conductor material bonded to the substrate by means of glue, winding circuitry, removing the conductive material from the non-conductive part of the winding and filling the space between the conductors with aggregate in the form of a ferromagnetic powder and a binder followed by sintering, that, in order to reduce the effective air gap of the machine, the conductor material is bonded to the substrate with a fusible adhesive, ferromagnetic pleasing filler pressurized and sintered in the mold at a temperature above the degradation temperature after curing the adhesive and the core was removed substrate.