Process for impregnating electrical coils

摘要: A process for impregnating an electrical coil which comprises a winding comprising two or more layers consisting of than one turn electrically conducting wire-form material with polymer insulates the individual turns from another aid thermally curable epoxy resin composition, composition is solid at room temperature and following constituents: (a) temperature, selected (a1) polyglycidyl ethers based on novolaks; (a2) diglycidyl bisphenols, (a3) mixtures components (a2); (b) crosslinking agent component (a); (c) suitable accelerator reaction (b); (d) 15 to 70 percent by weight, overall weight filler (d1) calcium carbonate, (d2) quartz flour, (d3) wollastonite whose particles have average ratio length cross-section less 5:1; (d4) (d1), (d5) (d2), other inorganic fillers; also preferably (e) 10 60 reinforcements in form acicular fibrillar 0.05 2.5 mm 5:1 more, amount being not 80 inter alia does away need use sacrificial moulds reduces multiple curing time required completing coating coils, reducing it region few minutes.