Induction machine based hybrid aircraft engine starting/generati

Details Induction machine based hybrid aircraft engine starting/generati Induction machine based hybrid aircraft engine starting/generati

1989-12-14

1994-01-25

Cain, David C.

Electricity: single generator systems

Automatic control of generator or driving means

Speed or frequency of generator

322 90, 322 10, 322 29, 290 6, 290 38R, H02P 300

Patent

active

052819051

ABSTRACT:
This invention relates to a hybrid AC/DC power source for aircraft power generation and aircraft engine starting. The power source employs an induction motor/generator and a converter for converting high frequency AC power into separate DC and low frequency AC power for use by aircraft electrical systems. The subject invention contemplates the provision of a driver for the motor/generator comprising a circuit for providing excitation to the motor/generator when it is operating as a generator, the circuit also converting AC power produced by the generator into the high frequency AC power for use by the converter. The converter comprises a first rectifier which produces the DC power and a second rectifier and an inverter which together produce the low frequency AC power. The generator produces uncontrolled frequency AC power. Bidirectional switches operate within the circuit to invert DC excitation power to produce power for the AC excitation and to rectify output of the generator into DC. The generator can function as an induction motor to provide motive power to start the aircraft engine. Either external DC power can provide power to the induction motor via the circuit or external AC power can provide power to the induction motor via the circuit.

REFERENCES:
patent: 3267353 (1966-08-01), Franklin
patent: 4330743 (1982-05-01), Glennon
patent: 4401938 (1983-08-01), Cronin
patent: 4447737 (1984-05-01), Cronin
patent: 4488053 (1984-12-01), Cronin
patent: 4684873 (1987-08-01), Glennon
patent: 4830412 (1989-05-01), Raad et al.
patent: 4883973 (1989-11-01), Lakey et al.
patent: 4908565 (1990-03-01), Cook et al.

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