Speed control circuit for phase-locked loop motor drive systems

Details Speed control circuit for phase-locked loop motor drive systems Speed control circuit for phase-locked loop motor drive systems

1979-06-25

1981-06-02

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 331 1A, H02P 516

Patent

active

042713820

ABSTRACT:
A phase-locked loop motor drive system includes a crystal-controlled frequency source for generating reference frequency pulses at a selectable frequency for driving the motor at a desired speed and a frequency divider coupled to the oscillator to reduce the oscillator frequency to a suitable value as a reference frequency for comparison with the frequency and phase of a signal derived from the motor. In order to provide fine adjustment of the motor speed, a speed control circuit is connected between the oscillator and the frequency divider to inhibit the passage of the oscillator pulses to the frequency divider for a selectable period immediately following an output pulse from the frequency divider when it is desired to decrease the motor speed, and inject a train of higher frequency pulses into the frequency divider while the passage of the oscillator pulses is inhibited when it is desired to increase the motor speed.

REFERENCES:
patent: 2521789 (1950-09-01), Grosdoff
patent: 3286191 (1966-11-01), Cornwell
patent: 3344361 (1967-09-01), Granqvist
patent: 3516007 (1970-06-01), Bos et al.
patent: 3731220 (1973-05-01), Besenfelder
patent: 4097810 (1978-06-01), Aschwanden
patent: 4110694 (1978-08-01), Wilhelm

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