Method and circuit for the automatic control of the speed of a D

Details Method and circuit for the automatic control of the speed of a D Method and circuit for the automatic control of the speed of a D

1990-01-23

1991-05-28

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

318504, H02P 500

Patent

active

050201263

ABSTRACT:
The method consists in mounting the armature of an motor in a bridge circuit and in injecting, at the input of a circuit for amplifying the supply of the bridge receiving the control voltage, an automatic control signal corresponding to the difference between the intensity feedback and the voltage feedback picked up at the terminals of the bridge. Upstream of the amplifier circuit, there is injected an AC voltage with a frequency greater than a cut-off frequency of the motor, the AC voltage generating an AC component of the above-mentioned automatic control signal representing a disequillibrium of the bridge due to a variation of the armature resistance. This AC component is used as a source of a control signal of the gain of an amplifier with adjustable gain of an intensity feedback present at one of the terminals of the bridge.

REFERENCES:
patent: 3046464 (1962-07-01), Miller
patent: 3412305 (1968-11-01), Kanner
patent: 3560828 (1971-02-01), Kobayashi et al.
patent: 3568027 (1969-11-01), Bacon
patent: 3705337 (1972-12-01), Grabl
patent: 4163182 (1979-07-01), Tanikoshi
patent: 4303874 (1981-12-01), Iwai
patent: 4353017 (1982-10-01), Burke, Jr.
patent: 4645991 (1987-02-01), Ban et al.

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