Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By dynamoelectric machine converter
Patent
1979-04-09
1981-02-03
Shoop, William M.
Electric power conversion systems
Phase conversion without intermediate conversion to d.c.
By dynamoelectric machine converter
H02M 532
Patent
active
042492378
ABSTRACT:
A rotary phase converter for connection to a single-phase a.c. power source and adapted to supply polyphase current to a polyphase electrical load. The converter includes a dynamoelectric machine having at least three stator windings and at least first, second and third output terminals, an autotransformer and at least one capacitor. The stator windings of the dynamoelectric machine are oriented symmetrically with respect to each other both physically and electrically and each has a substantially equal number of active turns. The first and second terminals of the dynamoelectric machine are adapted to be connected to the single-phase a.c. power source and they are also outputs of the converter. The autotransformer is connected across the second and third terminals and has at least one tap positioned intermediate the ends thereof to serve as an output of the converter. The capacitor is connected between the first output terminal and the autotransformer tap serving as a converter output. The currents supplied from the converter outputs to the phases of the polyphase load are maintained substantially balanced at full load.
REFERENCES:
patent: 1246617 (1917-11-01), Lamme
patent: 1365691 (1921-01-01), Hellmund
patent: 3202896 (1965-08-01), Lewus
patent: 3670238 (1972-06-01), Ronk
patent: 3809980 (1974-05-01), Nottingham, Jr.
patent: 4079446 (1978-03-01), Hertz
patent: 4158225 (1979-06-01), Hertz
Hertz Claude M.
Ronk Leroy B.
Ronk Electrical Industries, Inc.
Shoop William M.
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