High-performance heat resistant insulation materials for coils

Abstract

A new impregnating epoxide resin has been developed by optimizing cross-linking densities. The resin satisfies the thermal index of 210C: this is the first time an epoxide system without a heterocyclic ring has done so. Thermal class 220C insulating systems of traction motor coils are developed by interaction of the impregnating epoxide resin and epoxide binding resin in a new insulating tape. The newly developed epoxide impregnating resin has low viscosity and very good workability. Therefore, electrically insulated coils of various classes of heat resistance, such as class C (> 180C), class H (180 C) and class F (155C), can be prepared by using only a single kind of impregnating resin, by selecting the insulating tape and hardening conditions. It is unnecessary to keep various kinds of impregnating resin corresponding to the different beat resistant grades and it is possible to decrease drastically the amount of waste generated by using several different impregnating resins.

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