Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By induction-type converter
Patent
1986-08-18
1988-10-18
Beha, Jr., William N.
Electric power conversion systems
Phase conversion without intermediate conversion to d.c.
By induction-type converter
336 5, 363 3, H02M 502
Patent
active
047791810
ABSTRACT:
A multiphase transformer is provided for converting an input signal having N phases into an output signal having M phases. The transformer includes a plurality of first windings connected together to provide a load for an N phase signal, with each of the first windings having a plurality of take-off points, including tap-off points interior to the ends of the first windings. A mechanism is provided for coupling the input signal to the first windings. A plurality of M output terminals is further provided as is a mechanism for coupling the M output terminals to at least some of the take-off points of the first windings. This mechanism includes a plurality of second windings, with the second windings each electrically coupled between one of the output terminals and one of the tap-off points of the first windings and with each of the second windings magnetically coupled to another of the first windings. The location of the tap-off points coupled to the output terminals, the number of turns of the second windings, and the phase of the magnetic coupling resulting in a respective one of the M phases at each of the M output terminals.
REFERENCES:
patent: 1712491 (1929-05-01), Darrieus
patent: 1932272 (1933-10-01), Kaar
Reduction of Line Current Harmonics in 3-Phase Off-Line Rectifier Systems by Use of an Efficient 3-Phase to 9-Phase Autotransformer Conversion Technique, Michael L. Williams, Naval Sea Systems Command, Apr. 12, 1979.
System Level Reduction of Line Current Homonics Caused by Capacitor Input Rectifiers in 3-Phase Systems, Michael L. Williams, Dec. 15, 1981.
Three-Percent Harmonic Current Limit on Shipboard Power Systems: Requirements and Solutions", Navy Power Supply Reliability Design & Mfg. Guidelines, NAVMAT P4855-1*, *Dec. 1982, Appendix B.
Dauhajre Abraham A.
Massoudi Mohammad A.
Peng Chung-Hang
Traver John H.
Almond Instruments Company, Inc.
Beha, Jr. William N.
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