D.C. motor speed control circuitry

Details D.C. motor speed control circuitry D.C. motor speed control circuitry

1977-05-13

1978-10-17

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318341, H02P 516

Patent

active

041211413

ABSTRACT:
A closed loop D.C. motor speed control circuit compares tachometer feed-back signals proportional to the D.C. motor speed with a voltage reference representing the desired motor speed and generates pulses for controlling a variable duty cycle switch in the motor circuit for maintaining a constant speed irrespective of line voltage variations and load changes.

REFERENCES:
patent: 3358206 (1967-12-01), Thiele
patent: 3409814 (1968-11-01), Azuma et al.
patent: 4034274 (1977-07-01), Akima

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