Autotransformer

Details Autotransformer Autotransformer

1996-02-06

1997-04-08

Wong, Peter S.

Electric power conversion systems

Phase conversion without intermediate conversion to d.c.

By induction-type converter

363148, H02M 502

Patent

active

056194072

ABSTRACT:
The invention provides for an autotransformer for converting three-phase AC power to nine-phase AC power. The autotransformer includes three coils each having a plurality of serial windings and a plurality of stub windings. The serial windings form a delta and the stub windings are magnetically coupled with the serial windings from the same coil. Three terminals are provided at the apices of the delta and the three-phase AC source may be directly connected to the respective apex terminals. A plurality of direct outputs are interposed between respective serial windings and a plurality of indirect outputs are electrically connected with the second ends of the stub windings. The voltage magnitude of each of the direct outputs is preferably equal to the voltage magnitude of each of the indirect outputs. The voltages of the direct outputs and indirect outputs are out of phase with the voltages at the apex terminals.

REFERENCES:
patent: 2307527 (1943-01-01), Maslin et al.
patent: 2714700 (1955-08-01), Johnson
patent: 3711762 (1973-01-01), Eckenfelder et al.
patent: 4779181 (1988-10-01), Traver et al.
patent: 5124904 (1992-06-01), Paice
"Power Electronic Converter Harmonics" by Derek A. Paice, published by Paice & Associates, 1994, pp. 42-43, 70-73, 98-99, 206-209.

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