Induction motor control system

Details Induction motor control system Induction motor control system

1978-02-21

1979-04-24

Rubinson, Gene Z.

Electricity: motive power systems

Induction motor systems

Braking

318812, H02P 320

Patent

active

041514530

ABSTRACT:
The present invention is an induction motor control system which prevents an excessive induced voltage across the thyristors providing DC braking control. The amount of DC braking torque is controlled by the time of application of the DC braking voltage to the induction motor through a phase-control capacitor which sets the time of firing the braking thyristors within each half cycle of the AC voltage. In a first embodiment the firing of all the braking thyristors is inhibited upon application of the DC braking control signal until the half cycle of the AC voltage associated with a predetermined braking thyristor. In a second embodiment the firing of a predetermined braking thyristor is inhibited during the half cycle of the AC voltage of the application of the DC braking control signal and the next succeeding half cycle. In both embodiments the braking thyristors are fired during their associated half cycle of the AC voltage thereafter to apply a continuing DC braking voltage to the induction motor.

REFERENCES:
patent: 3514682 (1970-05-01), Corey
patent: 3866097 (1975-02-01), Anzai et al.
patent: 3897595 (1975-07-01), Fearno
patent: 4072880 (1978-02-01), Oshima et al.

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