Wires and cords. Winding wires. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Wires and cords. Winding wires. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Electrical materials

Main assignment of winding wires - production of windings of transformers / chokes, relay coils, electrical machines, etc. Winding wires with enamel insulation subdivided according to the following parameters and are denoted by letters:

by type of enamel insulation: polyvinyl acetate (V - vinylflex, M - metalvin, U - polyurethane, E - polyester, I - polyamide, AI - polyamideimide, EI - polyetherimide, F - polyether cyanurythimide freon-resistant);
sectional shape: without a letter - round, P - rectangular;
by insulation thickness: type 1 - 1, type 2 - no digit;
according to the design of the insulation - without a letter - single-layer, D - two-layer, T - three-layer, H - four-layer, K - with a thermoplastic coating that sticks together under the influence of temperature;
by temperature index, in °С -105,120,130,155,180,200,220 and above;
by wire material: without a letter - copper, BZh - iron-free copper, MN - nickel-plated copper, A - soft aluminum, AT - hard aluminum from alloys: MM - soft manganin, MT - hard manganin, KM - soft constantan, KT - hard constantan, NK - nickel-cobalt.

For the wires specified in table. 1.42, minimum operating temperature 60 °C, service life at maximum operating temperature - 20 hours.

Winding wires with enamel insulation, developed before 1987, have retained old notation:

PEL - copper wires, insulated with oil-based varnishes;
PEV-1 and PEV-2 - copper wires, insulated with varnish VL-931;
PET-155 - copper wires, insulated with enamel varnish based on polyetherimide;
PESHO - copper wires with enamel-fiber insulation, insulated with one layer of silk thread;
PELO - insulated with one layer of polyester threads;
PEBO - insulated with a single layer of cotton yarn.

In accordance with GOST 26615-85, a new designation of winding wires with enamel insulation has been introduced, for example:

PEAI-2000,100 - enameled wire with copper wire, round with polyamide insulation with insulation thickness of type 1, temperature index 200 °C and nominal diameter 0,1 mm.

High-frequency winding wires (litz wires) are designed for the manufacture of high-frequency coils of circuits with a high quality factor. They are a bundle of copper wires with a diameter of 0,05; 0,07; 0,1; 0,2 mm in enamel insulation each. Industry releases high-frequency winding wires of the following brands:

Power lines, LEL - without additional insulation;
LELD - with silk and lavsan braids in two layers;
LELO - the same, in one layer;
LEPKO - with nylon braid;
LESHD - with a silk braid in two layers;
LESHO - the same, in one layer.

Table 1.42. The main parameters of copper winding wires

Winding wires

In table. 1.43 are given main parameters of high-frequency winding wires.

Table 1.43. The main parameters of high-frequency winding wires

Winding wires

Author: Koryakin-Chernyak S.L.

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