process for the manufacture of coils consistent to wrap the minds of machines dinamoelettriche

摘要

A one-turn stator coil for arrangement in winding slots of a rotary a.c. machine, in which the coil sides are made in the form of roebel bars, is produced by forming two hair-pin shaped bundles of strand loops, with the strand loop ends in each bundle having different radii of curvature, displacing the strand loop ends of each bundle longitudinally, with the loop end of smallest radius of curvature in one bundle facing the other strand loop ends in that bundle with its convex surface, and with the smallest strand loop end in the other bundle facing in the direction of the loop ends of the bundle with its concave surface, bending both bundles at the same distance from the nearest strand loop end to form sidewise-bent portions in all the strand loops, pushing together the curved strand loop ends of both bundles in the longitudinal direction to their original position, transposing the strands in each of the bundles successively to form a roebel bar strand disc, interfitting the two roebel bar strand discs and spreading the shanks of the resulting hairpin-shaped body to form a coil.