SU97600A1 - The method of impregnation of the windings of electrical machines and apparatus - Google Patents

Description

The known methods for isolating the windings of electrical machines and apparatuses by impregnating them with varnishes and compounds have a number of disadvantages; In particular, application :; varnishes do not provide necessary; Blagoostikost, the use of compounds, pos ol. 1sh, it can improve moisture resistance due to prolonged exposure to:, 1 current, of the order of

140,100

It has been proposed to use for impregnating the windings of hardened Hj, Ho, insulating materials (thermo-reactive resins). However, these lags; 1 because of their viscosity, only large gaps can be filled (for example, between the transformer windings).

According to Paragraph, for the impregnation of the windings of electric machines, and argaratosis, molten thermoplastic artificial resins are used (e.g., polyamide). obtacledne high temp.

The use of these resins for pressure impregnation of windings provides a simplification of the process and acceleration of the process.

In the implementation of the proposed method, the polyamide resin melted and heated to 260-320 serves the chamber by the force of a hydraulic press in the cold mold. in which products with windings are installed. The low viscosity of the molten polyamide resins allows for the filling of very small gaps; at the same time, a zan1I1 pa sheath of products is made. Since the process takes only a few seconds, the insulating properties of the windings made with a PEL and PEV brand wire do not deteriorate during a short-term exposure to high temperature.

The high melting point of polyamide scars and their high mechanical strength allow this type of insulation to be applied also to rotating windings. The windings are rigidly cemented, which increases their operational reliability.

No. 97600

In the manufacture of stators and korea electric machines with impregnated} their windings with polyamide smos; This eliminates the need to use groove wedges, as the free 1 height: your groove is filled with resin.

The whole cycle of pouring resin under pressure takes only about one minute (ten or more hours n) and the usual impregnation with varnishes).

11rd and 3 about b ii te and the method of impregnating the windings of electrical machines and artificial pressure machines, which also, for the purpose of improving the technology and speeding up the process, for impregnating Molten thermo-plastic artificial resins with a high melting temperature (e.g. polyamide) are used.