Motor speed adjusting apparatus

Details Motor speed adjusting apparatus Motor speed adjusting apparatus

1978-04-21

1980-07-08

Smith, Jr., David

Electricity: motive power systems

With signals, meters, recorders or testing devices

318314, 318318, H02P 728

Patent

active

042119677

ABSTRACT:
A motor speed adjusting apparatus comprising a motor, a motor speed setting device such as an up-down counter, a programmable divider the divisor of which is programmed by the motor speed setting device, a reference signal generator, a phase comparator which generates a d.c. voltage corresponding to the phase difference between the reference frequency signal and the output signal of the programmable divider, and a voltage controlled oscillator which oscillates at a frequency corresponding to the output of the phase comparator. The motor speed is adjusted according to the output frequency of the oscillator by step deviation from the standard motor speed, and further that deviation is displayed by a display device controlled by the motor speed setting device.

REFERENCES:
patent: 3268788 (1966-08-01), Branco
patent: 3458823 (1969-07-01), Nordahl
patent: 3724720 (1973-04-01), Bullivant
patent: 3974428 (1976-08-01), Hafle
patent: 3982190 (1976-09-01), Schaefer
patent: 4031466 (1977-06-01), Krause et al.
patent: 4074196 (1978-02-01), Webster
Connelly et al., "Phase-Lodged Loop Includes Lock Indicator", Electronics, 9/5/74, pp. 112-113.
Smithgall, D. H., "A Phase-Locked Loop Motor Control System", IEEE Transactions on Industrial Electronics, vol. IECI-22, No. 4, 11-75.

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