Excitation system for a brushless generator having separate AC a

Details Excitation system for a brushless generator having separate AC a Excitation system for a brushless generator having separate AC a

1989-10-27

1990-07-03

Ro, Bentsu

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318158, 318711, 318719, 290 46, F02N 1104, H02P 936

Patent

active

049394410

ABSTRACT:
An excitation system for a brushless generator includes an exciter portion having a set of polyphase exciter field windings and an additional exciter field winding disposed in a stator of the generator, a source of polyphase, constant-frequency AC power and circuitry coupled to the set of polyphase field winding for connecting the source of polyphase, constant-frequency AC power thereto at a beginning of operation in a starting mode whereby AC power is induced in an exciter portion armature winding by transformer action. AC power is further provided to armature windings of a main generator portion to thereby cause a rotor of the generator to accelerate. An autotransformer is provided to reduce the voltage provided by the source of polyphase AC power prior to application of such power to the polyphase field windings so that the need for an auxiliary inverter is obviated. Thereafter, at least one of the windings of the set of polyphase windings is connected in series with the additional field winding when the speed of the rotor reaches a predetermined speed and a DC current of controlled magnitude is delivered to the series-connected exciter field windings to thereafter allow operation in a generating mode.

REFERENCES:
patent: 3034035 (1962-05-01), Baumann et al.
patent: 3379947 (1968-04-01), Lalonde
patent: 3809914 (1974-05-01), Kilgore et al.
patent: 3908161 (1975-09-01), Messenger
patent: 4093869 (1978-06-01), Hoffmann et al.
patent: 4219739 (1980-08-01), Greenwell
patent: 4305001 (1981-12-01), Vamaraju et al.
patent: 4467267 (1984-08-01), Hucker et al.
patent: 4743777 (1988-05-01), Shilling et al.
Dhyanchand, co-pending application Ser. No. 07/408,928, filed Sep. 18, 1989, entitled "Brushless Generator Having a Three-Phase Combined AC/DC Exciter Field Winding".

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