Patent ID: 9214845
Filing Date: 2015-12-15
Classification: H02K,Y10T

Abstract:
1. A method for manufacturing a helically wound alternator core, comprising the steps of: stamping an electrical steel strip to create a lamination strip having a back-iron and projecting teeth; helically winding the lamination strip by applying at least one force to the strip to bend the lamination strip to form the helically wound alternator core, said at least one force causing at least one area of plastic deformation resulting in internal stress and strain in at least said back-iron of the strip; welding the helically wound alternator core; and thereafter, annealing the welded helically wound alternator core in a neutral or decarburizing atmosphere at temperatures in a range of 1300° F. to 1600° F. which relieves the stress and strain and which causes recrystallization at said at least one area of plastic deformation caused by said at least one force which reduces electrical core loss.