Motor control apparatus with an improved thyristor chopper circu

Details Motor control apparatus with an improved thyristor chopper circu Motor control apparatus with an improved thyristor chopper circu

1979-02-07

1981-08-18

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345G, 318505, H02P 516

Patent

active

042849349

ABSTRACT:
A motor control apparatus to supply current from a D-C source to an electric motor has a thyristor chopper circuit, the duty factor of which is controlled depending on a current instruction signal. The thyristor chopper circuit is provided between the terminals of the D-C source in series with an electric motor, and has main and auxiliary thyristors. A series connection of a capacitor and a reactor, forming commutating elements, is connected across the auxiliary thyristor and oscillates to generate a pulse of current through a forward diode in order to turn off the main thyristor when the auxiliary thyristor is turned on. In addition, a saturable current transformer having first, second and third windings is provided. Through the first winding chopper current flows, and the second winding operates as the reactance of the commutating elements. The third winding is provided within the closed circuit formed when the chopper circuit is blocked, and causes current across the secondary winding to charge the capacitor of said chopper circuit.

REFERENCES:
patent: 3488756 (1970-01-01), Skrivanek, Jr.
patent: 3536972 (1970-10-01), Lutz et al.
patent: 3588654 (1971-06-01), Balazs
patent: 3763418 (1973-10-01), Beck et al.
patent: 3932800 (1976-01-01), Iwamoto et al.
patent: 3942094 (1976-03-01), Akamatsu
patent: 4074175 (1978-02-01), Born et al.

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