METHOD TO MANUFACTURE WINDINGS OF ELECTRIC MACHINES Russian patent published in 2014 - IPC H02K15/12 

FIELD: electricity.

SUBSTANCE: electric insulation material impregnated with a heat-resistant binder is applied onto a winding, the winding is installed on a core, heated and impregnated under vacuum and pressure, besides, the main insulation of the winding is first impregnated with polyetherimide compound of H heat-resistance class, and a monoblock is impregnated with epoxide compound of F heat-resistance class with subsequent hardening. In particular, during method realisation, a mica-containing tape is applied onto a pole coil, and the tape is impregnated with polyetherimide compound of H heat-resistance class, the coil is placed on the pole previously insulated with electric insulation material. The monoblock is heated to temperature providing for compound migration inside the insulation, is placed into an impregnation autoclave and impregnated with compound of the heat resistance class F under vacuum and pressure. After draining of compound excess the monoblock is placed into a thermostat and hardened at the temperature providing for simultaneous hardening of the compound in the tape and the impregnation compound in the winding. Main insulation exposed to maximum thermal loads corresponds to the heat resistance class H. The gap between the coil and the pole is impregnated with compound of heat resistance class F, which has high mechanical strength, heat conductivity and heat resistance up to the temperature of heat class resistance H.

EFFECT: higher force of pressing of windings in electric machines of heat resistance class H.