Electricity: motive power systems – With particular motor-driven load device – Power- or motion-transmitting mechanism
Patent
1986-08-06
1987-09-22
Shoop, Jr., William M.
Electricity: motive power systems
With particular motor-driven load device
Power- or motion-transmitting mechanism
318 11, 318111, 322 40, 290 4C, F01D 1510, H02P 900
Patent
active
046957766
ABSTRACT:
An electrically-compensated constant speed drive according to the present invention includes a speed summer having first and second input shafts and an output shaft at which constant speed motive power is developed wherein the first input shaft is coupled to a prime mover output shaft. A speed-compensating permanent magnet machine includes a motive power shaft coupled to the second input shaft of the speed summer and electrical power windings. A control permanent magnet machine includes a motive power shaft coupled to either of the first or output shafts of the speed summer and also includes electrical power windings. A power converter interconnects the power windings of the permanent magnet machines and comprises a first bi-directional AC/DC converter coupled to the electrical power windings of one of the permanent magnet machines, a second bi-directional AC/DC converter coupled to the electrical power windings of the other of the permanent magnet machines, a bi-directional DC/DC converter coupled between the AC/DC converters and a circuit for controlling the converters whereby the speed compensating permanent magnet machine develops compensating speed of a magnitude and direction sufficient to maintain the speed summer output shaft at the desired speed.
REFERENCES:
patent: 3056914 (1962-10-01), Potter
patent: 4410935 (1983-10-01), Dang
patent: 4437050 (1984-03-01), Overzet
patent: 4482854 (1984-11-01), Kawada et al.
patent: 4489371 (1984-12-01), Kernick
patent: 4520255 (1985-05-01), Bredenkamp et al.
patent: 4572961 (1986-02-01), Borger
"Electrically Compensated Aircraft Alternator Drive" by J. J. Cathey appearing in an unknown publication by IEEE, 1983, Publication No. 0547-3578/83/0000-0116.
Dhyanchand P. John
Dishner Bryan W.
Juarros Richard D.
Ro Bentsu
Shoop Jr. William M.
Sunstrand Corporation
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