System for controlling rotation of motor

Details System for controlling rotation of motor System for controlling rotation of motor

1980-11-10

1982-11-30

Weldon, Ulysses

Electricity: motive power systems

With particular motor-driven load device

Tension-maintaining type of motor-control system

318 7, 318 53, B65H 5938

Patent

active

043617875

ABSTRACT:
A system for controlling the rotation of a motor comprises a detector for detecting the rotation of the motor, frequency discriminator for frequency discriminating the output of the detector, a loop filter comprising resistors and a capacitor which lowers the high-frequency components of the output signal of the frequency discriminator, a switching circuit which is connected to the output side of the loop filter, the switching circuit grounding the output side of the loop filter and discharging the capacitor of the loop filter in a state before starting of the high-speed rotation of the motor, and non-grounding the loop filter in a state in which the motor is undergoing high-speed rotation, and a motor driving circuit which drives the motor in accordance with the output signal of the loop filter through the switching circuit. The capacitor is charged up with a predetermined time constant due to the output of the frequency discriminator upon starting state of the high-speed rotation of the motor and gradually increases the output voltage of the loop filter with the predetermined time constant.

REFERENCES:
patent: 3458155 (1969-07-01), Planteijdt
patent: 3518516 (1970-06-01), Pawletko
patent: 3582743 (1971-06-01), Diaz et al.
patent: 4126817 (1978-11-01), Luzio
patent: 4215298 (1980-07-01), William et al.

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