Spindle drive control system

Details Spindle drive control system Spindle drive control system

1983-12-21

1986-03-25

Roskoski, Bernard

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 318341, 318327, 318317, H02P 500

Patent

active

045786259

ABSTRACT:
Disclosed is a rotational speed control system for comparing the rotational speed of a rotating disk as indicated by index pulses occurring one or more times per revolution of the disk, with a reference time representing the desired time between successive index pulses. The system employs logic circuitry external to any microprocessor control system employed by the rotating disk system. The reference time may be supplied by counters counting externally supplied clock pulses to a fixed value. The speed control system provides a speed up command or slow down command in a manner proportional to the speed error to the disk drive motor where the time between successive index pulses is greater or less, respectively, than the reference time.

REFERENCES:
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patent: 3828234 (1974-08-01), Goldberg
patent: 3906319 (1975-09-01), Milligan
patent: 4197489 (1980-04-01), Dunn et al.
patent: 4307324 (1981-12-01), Regnier
patent: 4348585 (1982-09-01), Hoffman
patent: 4355266 (1982-10-01), Pearson
patent: 4360767 (1982-11-01), Akiyama et al.
patent: 4386300 (1983-05-01), Ogawa
patent: 4418307 (1983-11-01), Hoffmann et al.
patent: 4498034 (1985-02-01), Shirakawa

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