System for driving DC motor

Details System for driving DC motor System for driving DC motor

1979-09-18

1981-08-18

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318493, 318434, H02P 516

Patent

active

042849322

ABSTRACT:
A system for a DC motor associated with a field winding and driven by using a three-phase anti-parallel thyristor bridge circuit, comprising a first means for controlling an armature current I.sub.a flowing through an armature of the DC motor, and; a second means for controlling a field current I.sub.f flowing the field winding by obtaining the feedback values of a voltage E.sub.a of the armature and the field current I.sub.f and by changing the maximum level of the current I.sub.f in accordance with a three-phase alternating voltage V.sub.ac applied to the three-phase anti-parallel thyristor bridge circuit. In the system, when the three-phase alternating voltage V.sub.ac decreases to a value lower than a predetermined value V.sub.o, the field current I.sub.f are decreased so that the armature voltage E.sub.a is decreased.

REFERENCES:
patent: 3536957 (1970-10-01), Iverson et al.
patent: 3584706 (1971-06-01), Hall et al.
patent: 3950684 (1976-04-01), Peterson
patent: 3961688 (1976-06-01), Maynard
patent: 3978381 (1976-08-01), Yamamoto et al.
patent: 4118749 (1978-10-01), Matuzaki et al.

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