Bidirectional speed control system

Details Bidirectional speed control system Bidirectional speed control system

1974-01-02

1977-02-15

Scott, James R.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318327, H02P 506

Patent

active

040084248

ABSTRACT:
An error voltage signal which is of magnitude related to the difference between the actual speed of a d.c. motor and a desired speed is selectively applied to either the inverting input terminal of an operational amplifier or to its non-inverting input terminal, dependent upon the direction of rotation of the motor. The circuit components connecting the error signal to the input terminals are selected to provide the same absolute value of gain for the amplifier regardless of whether the input is to the inverting terminal or to the non-inverting terminal. The system substantially reduces complexity and diminishes the number of components required for this type of bidirectional speed regulation.

REFERENCES:
patent: 3471759 (1969-10-01), Broverman
patent: 3745436 (1973-07-01), Buttafava
patent: 3811098 (1974-05-01), Williams
"Transformerless Modulator", Riso, V., IBM Tech. Discl. Bulletin, vol. 12, No. 3, 8/69.
Tenny, Ralph, "The Operational Amplifier," Popular Electronics, vol. 35, No. 2, Aug. 1971, pp. 30-40.

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