Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator
Patent
1980-12-29
1983-08-30
Hickey, R. J.
Electricity: single generator systems
Automatic control of generator or driving means
Speed or frequency of generator
290 38R, 322 32, 322 40, 322 47, F02N 1100, H02P 906, H02P 946, H02P 1500
Patent
active
044019386
ABSTRACT:
The invention is an aircraft power generation system which utilizes an induction-machine (G.sub.1) as a primary generator of variable-voltage/variable-frequency power. The induction-machine (G.sub.1) is directly driven by the engine (14) and is excited by an excitation-generator (G.sub.2) such that the induction-machine (G.sub.1) operates in a generating mode. A variable-speed drive (20), shown as a toroidal drive (30), controls the excitation frequency of the induction-machine (G.sub.1) such that the negative slip-frequency is controlled as a function of the input speeds (N.sub.1), (N.sub.2) and the electric load on the generator. Control of the toroidal drive (30) and thus speed (N.sub.2) is accomplished by a negative-slip control circuit which includes a drive control logic circuit (36), a proportional actuator (34), a control-start panel (48), and a steering mechanism (32).
In another aspect of the invention, the induction-machine (G.sub.1) operates in a start-mode to start the engine (14). In this mode of operation, after engine starting is initiated from control-start panel (48), a start-logic circuit (52) establishes a programmed voltage/frequency output from a start-power electronics source (46). The voltage/frequency output, programmed from a low value, against time, up to a predetermined high value is applied to the induction-machine (G.sub.1) field to bring the engine (14) up to speed.
REFERENCES:
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patent: 2153252 (1939-04-01), Hunsdorf
patent: 2359886 (1944-10-01), Wikkenhauser
patent: 2449905 (1948-09-01), Lotts et al.
patent: 2810844 (1957-10-01), Morrill
patent: 2990503 (1961-06-01), Clark
patent: 3032696 (1962-05-01), Payne et al.
patent: 3809914 (1974-05-01), Kilgore et al.
patent: 4330743 (1982-05-01), Glennon
Hickey R. J.
Lockheed Corporation
Turner Lowell G.
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