Arrangement for controlling the speed of a motor

Details Arrangement for controlling the speed of a motor Arrangement for controlling the speed of a motor

1976-04-28

1978-03-07

Scott, James R.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

H02P 500

Patent

active

040781941

ABSTRACT:
A motor speed control arrangement in which the back EMF of the motor is sensed in all operating modes and is used as a measure of the motor speed. The effect of commutator ripple due to varying rotor resistance is compensated by adjustment of resistors associated with an operational amplifier, so that the output of the amplifier provides the average value of the back EMF without distortion. A comparator compares the output of the amplifier with an input reference signal denoting the desired speed of the motor and applies an error signal to a driving circuit which drives the motor with current in a manner that tends the error signal to attain minimum or zero value.

REFERENCES:
patent: 3181050 (1965-04-01), Berman
patent: 3358204 (1967-12-01), Bradley
patent: 3475672 (1969-10-01), Oltendorf
patent: 3649895 (1972-03-01), Joslyn
patent: 3705337 (1972-12-01), Grabl
patent: 3716771 (1973-02-01), Maynard
patent: 3878446 (1975-04-01), Brandt

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