Patent ID: 7796413

Claim:
An autotransformer for converting three-phase AC power to at least six phase AC power comprising: three coils, each of said coils having at least four serial windings including an outrigger winding and three serial side windings, said coils having their serial windings arranged in a delta with one of said outrigger windings extending from an apex of the delta, whereby each side of the delta has at least three serial windings and each apex of the delta has one of the outrigger windings extending therefrom; each of the outrigger coils having an end terminal remote from the adjacent apex from which such outrigger coil connects for connection of said terminals to a three-phase AC input; and at least two direct outputs along each side of the delta, each direct output being a direct tap at a natural point between adjacent side windings with no additional phase correction or stub windings for said direct outputs, whereby at least six equiangularly spaced phases are presented at said direct outputs.