Phase-shifting transformer with a six-phase core

A phase-shifting transformer comprising:

• a six-phase magnetic core including six mutually independent magnetic circuits, first through sixth, through which six mutually independent magnetic fluxes may pass, any two adjacent numbered circuits being geometrically adjacent to each other, wherein any two adjacent magnetic circuits comprises an interphase portion that is common to both magnetic circuits;
• a three-phase primary winding having three phase-windings linking with the first, third, and fifth, respectively, of the six magnetic circuits of the six-phase magnetic core and having three inputs for receiving three-phase input voltages, the third magnetic circuit including a phase-winding having a winding direction reversed with respect to winding directions of phase-windings linking with the first and fifth magnetic circuits whereby when three-phase input voltages whose phases are displaced by 120 degrees from each other are applied to the three inputs, three magnetic fluxes whose phases are separated by 60 degrees from each other are generated in the first, third, and fifth magnetic circuits;
• a three-phase secondary winding having three phase-windings linking with the first, third, and fifth, respectively, of the six magnetic circuits of the six-phase magnetic core and having three output terminals;
• a three-phase tertiary winding having three phase-windings linking with the first, third, and fifth, respectively, of the six magnetic circuits of the six-phase magnetic core, the three phase-windings being electrically coupled in a delta configuration;
• a three-phase excitation winding having three phase-windings linking with the second, fourth, and six, respectively, of the six magnetic circuits of the six-phase magnetic core, said three-phase excitation winding being wound on the magnetic core, electrically coupled in a Y configuration, and electrically coupled to said three-phase tertiary winding, whereby when three-phase input voltages whose phases are displaced by 120 degrees from each other are applied to the three inputs, three magnetic fluxes are generated in the second, fourth, and sixth magnetic circuits, respectively, which are separated by 60 degrees from each other and by 30 degrees from the phases of the magnetic fluxes generated by the three phase-windings of said three-phase primary winding in adjacent magnetic circuits, whereby the differential magnetic fluxes passing through said interphase portions of said six-phase magnetic core each consists of a vector difference between two magnetic fluxes of the magnetic circuits to which the interphase portions are common whose phases are separated by 30 degrees from each other;
• and
• a three-phase phase-regulating winding having three phase-windings linking with second, fourth, and sixth, respectively, of the six magnetic circuits of the six-phase magnetic core and magnetically coupled with the respective three phase-windings of said three-phase excitation winding via the second, fourth, and sixth magnetic circuits, respectively, wherein the three phase-windings of said three-phase phase-regulating winding are electrically coupled in series with the three phase-windings of said three-phase secondary winding.