Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator
Patent
1983-03-23
1985-04-09
Hickey, R. J.
Electricity: single generator systems
Automatic control of generator or driving means
Speed or frequency of generator
322 59, 322 61, H02P 942, H02P 948
Patent
active
045104336
ABSTRACT:
A variable-speed constant-frequency alternator compensating for changes in speed of the prime mover by electromagnetically rotating the rotor's magnetic poles around the rotor. If the prime mover has a rotational speed above or below that required to produce the desired output frequency, the magnetic poles rotate about the rotor in a forward or reverse direction, respectively. To connect the alternator to an external a.c. source, the alternator's controls match its output to the precise amplitude frequency, and phase of the external source. The rotor, for each magnetic pole pair, includes three windings. Three-phase power in these windings, produces the magnetic pole pair and rotates it relative to the rotor. Each winding couples to a flopper circuit having k sets of resistances. The resistances, taken in turn, have an inverse proportionality to the magnitude of the desired sine wave for the three-phase current in the rotor's windings. Coupling these resistances, one at a time, to a constant voltage source creates the equivalent sine wave current for the rotor's windings. A transducer produces the same number of pulses per revolution of the rotor as the number of resistances in the flopper circuit. Insufficient or excessive rotor speed results in the counting of too few or too many pulses. The controller then induces a shifting of the flopper circuit to rotate the magnetic poles on the rotor to maintain the output frequency constant.
REFERENCES:
patent: 3619762 (1971-11-01), Pritchard
patent: 4035712 (1977-07-01), Yarrow et al.
patent: 4246531 (1981-01-01), Jordan
Rothbart et al., "Development of a Variable Shaft Speed Alternator", U.S. Dept. of Energy Pub., 2/1982, (DOE/ID/12203-T1).
Gamze Maurice G.
Sprung Louis H.
Friedman Eugene F.
Hickey R. J.
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