Phase locked loop speed control circuit for controlling speeds a

Details Phase locked loop speed control circuit for controlling speeds a Phase locked loop speed control circuit for controlling speeds a

1990-05-15

1992-05-19

Shoop, Jr., William M.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Plural linear-movement motors

388911, 388921, H01P 500

Patent

active

051151723

ABSTRACT:
The invention concerns a phase locked loop speed control circuit for controlling the speeds of two or more objects. It includes pulse generators for generating reference pulses, first counters for counting each of these reference pulses, encoders for detecting relative travelling distances of the objects, second counters for counting encoder pulses from the encoders, first subtracters for subtracting the outputs of the second counters from those of the first counters, second subtractors for subtracting the encoder pulses from the reference pulses, corrector sections for correcting the differences output by the first and the second subtractors, and adjusting sections for adjusting the movements of the objects based on the corrected differences.

REFERENCES:
patent: 288440 (1988-12-01), Ishii et al.
patent: 3671728 (1972-06-01), Day et al.
patent: 3883785 (1975-05-01), Fulcher et al.
patent: 4381478 (1983-04-01), Saijo et al.
patent: 4588936 (1986-05-01), Itoh et al.
patent: 4837492 (1989-06-01), Kurosawa et al.
patent: 4841202 (1989-06-01), Dishner et al.
Patent Abstracts of Japan-corresponding to Japanese Patent Application 60-136730, laid open on Jul. 20, 1985.

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