Electricity: single generator systems – Automatic control of generator or driving means – Voltage of generator or circuit supplied
Patent
1976-06-23
1978-12-05
Hickey, Robert J.
Electricity: single generator systems
Automatic control of generator or driving means
Voltage of generator or circuit supplied
74 13, 290 54, 320 61, 331114, H02J 714, F16H 3700
Patent
active
041288009
ABSTRACT:
A vehicular battery charging system particularly adapted for railroad cars such as cabooses, in which an axle drive/hydraulic pump unit is coupled to the end of an axle via a flexible coupling and right angle gear drive. The hydraulic pump provides hydraulic pressure to a hydraulic motor/alternator unit. The a.c. output from the alternator is rectified and the resulting d.c. is employed to charge the batteries at a voltage which is very accurately controlled by a voltage regulator. The regulator comprises a switching circuit controlling the excitation of the field or rotor winding of the alternator by the rectified alternator output, in response to a repetitive pulse signal from a free-running multi-vibrator. The duty cycle of the multi-vibrator pulse signal is controlled in response to the output voltage of the alternator, forming a closed loop feedback system whereby excitation to the alternator is controlled in response to the output thereof to maintain a very constant, predetermined output voltage suitable for battery charging. Overload protection circuitry is included to limit rotor excitation should the field windings be accidentally short circuited.
REFERENCES:
patent: 1400793 (1921-12-01), Bouche
patent: 1565908 (1925-12-01), Conwell
patent: 3049928 (1962-08-01), Boughner
patent: 3617857 (1971-11-01), Gunderson
patent: 3641416 (1972-02-01), Riff
patent: 3675160 (1972-07-01), Staker
patent: 3740668 (1973-06-01), Chopra
Foster Richard C.
Peters Dudley C.
Scott John P.
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