Flexible loop, hard slot coils for dynamoelectric machine windings

Claim 1

A pre-formed coil for a dynamoelectric machine comprising a plurality of conductors wound in a closed loop and shaped to a coil characterized by elongated slot regions for insertion in axially extending cavities of a magnetic member of a dynamoelectric machine and loop regions interconnecting the ends of said slot regions, said entire length of the coil being wrapped with a homogeneous tape having a compatible thermosetting insulating resin system impregnated therein, the portion of said insulating resin system impregnated within the tape wrapped atop said slot regions of said coil being fully cured to a rigid structure and the portion of the insulating resin system applied to the tape wrapped atop the loop regions of said coil being only partially cured to a gel state to provide a hard slot, flexible loop coil, said thermosetting insulating system comprising two or more resins having different degrees of functionality and composition, the weight percentages of the resins applied to the slot regions of the coil varying relative to the weight percentages of the same resins in the loop regions of the coil to produce a complete cure of the resin system in the slot regions of the coil and a partial cure in the resin system applied to the loop regions of the coil.