Insulation for revolving-armature coil.

摘要

An insulation structure for revolving-armature coil, according to the present invention, principally uses a polyimide file tape or sheet as at least a part of element wire insulation and insulation to the earth. The tape or sheet is formed of a polyimide composition generally expressed by the following formula: <CHEM> Synthetic resin compound containing polyimide resin and epoxy resin as principal material and an acid anhydride type hardening agent is impregnated and hardened.