Phase-shifting transformer with a six-phase core

Details Phase-shifting transformer with a six-phase core Phase-shifting transformer with a six-phase core

1989-08-08

1991-03-26

Kozma, Thomas J.

Inductor devices

Polyphase

Adjustable inductor

336 12, 336181, 336212, 336215, 363160, H01F 3300

Patent

active

050032771

ABSTRACT:
A phase-shifting transformer including main and series transformer units comprises a six-phase core including six independent magnetic circuits, numbered first through sixth from right to left. The combined U-, V-, and W-phase windings of the main transformer unit link with the fifth, third, and first magnetic circuits, respectively. The combined a-, b-, and c-phase windings of the series transformer unit link with the sixth, fourth, and second magnetic circuits. The winding directions of the V- and b-phase windings are reversed with respect to those of other phase windings. Thus, if three-phase voltages 120 degrees apart are input to the main transformer unit, then the phase angles between the main magnetic fluxes generated in any two adjacent magnetic circuits are equal to 30 degrees. Consequently, the magnitudes of the differential magnetic fluxes passing through the interphase portions between two adjacent magnetic circuits are reduced to about one half of the magnitudes of the main magnetic fluxes, with the result that the cross-sectional area of the interphase portions of the core can be reduced to about one half of that of its main leg portions.

REFERENCES:
patent: 4488136 (1984-12-01), Hansen et al.
patent: 4853664 (1989-08-01), Asakura

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