Circuit for producing for a feedback motor speed control loop an

Details Circuit for producing for a feedback motor speed control loop an Circuit for producing for a feedback motor speed control loop an

1975-07-07

1977-05-17

Dobeck, B.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318328, 318341, H02P 516

Patent

active

040244458

ABSTRACT:
A circuit for producing an error voltage for a negative feedback loop for automatic control of a motor speed comprises a monostable multivibrator triggered by a feedback signal of a frequency representative of the motor speed for generating a rectangular signal of a predetermined pulse width, a pulse height proportional to a source voltage for the multivibrator, and a duty cycle decided by the frequency. A potentiometer-integrator derives a variable voltage proportional to an average of the rectangular signal voltage. A potential divider for the source voltage derives a reference voltage indicative of a desired motor speed. A comparator derives a difference between the variable and reference voltages as the error voltage.

REFERENCES:
patent: 3553551 (1971-01-01), Arnold
patent: 3681670 (1972-08-01), Kadokura
patent: 3772580 (1973-11-01), Odone
patent: 3803472 (1974-04-01), Konrad

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