Reduction of armature copper losses: The inverted turn transposition for the reduction of losses due to non-uniform current distribution in the armature conductors of large A-C. machines

A new method of reduction of armature copper losses is described, which consists in the inversion of the conductors of a multi-turn barrel type coil at one or more places in the end portions of the coil. Previous writers have described methods of transposing the conductors in the slot and of carrying insulated strands through successive positions in successive coils, but the new method now described presents distinct points of difference in theory and in construction from any of these earlier methods. The theory of the new form of transposition is briefly described, complete formulas are presented for the most useful cases, and illustrations of its use are given.