PROCESS FOR PRODUCING STATOR OF DYNAMO-ELECTRIC MACHINE

The present invention provides a method for manufacturing a dynamoelectric stator enabling coil ends to be impregnated with varnish simply and to a high fill factor by adjusting varnish viscosity at a temperature of a stator during varnish application to a predetermined range. The configuration includes a varnish treatment process including: a preheating process in which the stator is preheated; a varnish application process in which a varnish adjusted so as to have a viscosity of 16 to 105 mPa·s at a temperature of the stator during varnish application is dripped onto a coil end from radially outside the stator while rotating the preheated stator around a central axis; and a varnish heat hardening process in which the varnish is hardened by heating the stator to which the varnish has been applied. In this manner, a stator can be manufactured in which coil ends are impregnated with varnish to a high fill factor, improving the electrical insulation properties and the galvanic corrosion resistance of the stator winding, and also increasing the overall rigidity of the stator.