Patent ID: 6525951
Filing Date: 2003-02-25
Classification: H01F,H02M

Abstract:
An auto-transformer for converting three-phase AC power to nine-phase AC power, comprising:a. three phases each having a plurality of serial and stub windings; b. said serial windings forming a wye connection; c. said stub windings each being magnetically coupled with corresponding ones of said serial windings; d. said serial windings being connected at one end to the corresponding point of said serial windings of the other two phases to form an electrical neutral point; e. three terminals connected to respective ends of said serial windings furthermost from the neutral point for connecting to a source of three-phase AC power; f. the end of said serial windings furthermost from the neutral point being connected to one end of a first set of two stub windings comprising windings from the other two phases; g. the opposite end of said stub windings from the other two phases providing a total of six output terminals; h. three additional output terminals being provided at the opposite end of serial windings on each phase closest to the source of three-phase AC power; i. a first phase wherein a stub winding from another phase is connected to the junction of said serial windings closest to the neutral point; j. the opposite end of said stub winding being connected to the end of the stub winding of the remaining phase remote from the source of the AC power to the first phase to form a first delta circuit.