Fast de-excitation brushless exciter

Details Fast de-excitation brushless exciter Fast de-excitation brushless exciter

1977-10-13

1979-05-01

Hickey, Robert J.

Electricity: single generator systems

Automatic control of generator or driving means

Plural conditions

322 28, 322 73, 361 20, H02P 930

Patent

active

041526368

ABSTRACT:
Thyristors are substituted for conventional diodes in the rotating rectifier assembly of a brushless exciter in a synchronous dynamoelectric machine. In contrast with prior systems in which thyristors are switched at relatively high ceiling voltages (requiring thyristors of high power rating and additional components for fast de-excitation), the gates of the thyristors in the present invention are fired only at a low voltage point of the negative half cycle of the polyphase armature voltage waveforms for fast de-excitation and are maintained in a fully conducting condition during the positive half cycle. This permits the use of thyristors having a relatively lower power rating and makes unnecessary additional components to achieve fast de-excitation.

REFERENCES:
patent: 3401328 (1968-09-01), Hartung
patent: 3671850 (1972-06-01), Mehnert et al.
patent: 3683268 (1972-08-01), Obata

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