Dynamic control system for braking DC motors

Details Dynamic control system for braking DC motors Dynamic control system for braking DC motors

1988-06-23

1990-06-12

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318368, H02P 506

Patent

active

049336096

ABSTRACT:
A system for controlling a pulse-driven dc motor includes a pulsed grounding switch, an inductor connected between the pulsed grounding switch and the armature of the dc motor, and a tracking circuit connected across the inductor. The control system further includes a variable resistor that provides a series path through the inductor for dissipating generated armature current from the motor. In operation, the resistance provided by the variable resistor depends upon the counter emf generated by the motor and upon transient voltages induced across the inductor when the pulsed grounding switch is periodically opened and closed. More particularly, the variable resistor provides minimal resistance when the back emf of the motor is low and provides increasing resistance as the back emf of the motor increases.

REFERENCES:
patent: 3188545 (1965-06-01), Sheheen
patent: 3189811 (1965-06-01), King
patent: 3297931 (1967-01-01), Gurwicz
patent: 3541414 (1970-11-01), Wilkerson
patent: 3568025 (1971-03-01), Havlicek
patent: 3590352 (1971-06-01), Ries et al.
patent: 3697820 (1972-10-01), Ehret
patent: 3794898 (1974-02-01), Gross
patent: 4165476 (1979-08-01), Weiser
patent: 4319170 (1982-03-01), Brent
patent: 4427931 (1984-01-01), Tsukihashi

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