Apparatus for applying field excitation to a synchronous electri

Details Apparatus for applying field excitation to a synchronous electri Apparatus for applying field excitation to a synchronous electri

1995-08-30

1996-10-15

Ip, Paul

Electricity: motive power systems

Synchronous motor systems

Field winding circuits

318718, 318712, 318727, 318801, H02P 540

Patent

active

055657508

ABSTRACT:
The present invention provides a digital circuit for controlling application of DC excitation to the rotor field winding of a synchronous electric motor. The circuit detects the analog slip frequency of the motor and converts the analog signal to a digital signal. A digital timer produces a timing signal after a predetermined time interval. After the frequency of the slip signal has slowed sufficiently, as indicated by the timing signal, a control signal is supplied to a thyristor to gate the thyristor and provide DC excitation to the rotor field winding.

REFERENCES:
patent: 4027215 (1977-05-01), Knight et al.
patent: 4027216 (1977-05-01), Rozek
patent: 4489263 (1984-12-01), Potter et al.
patent: 4509004 (1985-04-01), Shepard, Jr.
patent: 4591775 (1986-05-01), Nussel et al.
patent: 4641074 (1987-02-01), Hamilton, Jr. et al.
patent: 4659973 (1987-04-01), Stich

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