Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1988-12-28
1989-12-26
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318 85, 360 7303, 360 7302, 375119, G05B 102
Patent
active
048900451
ABSTRACT:
A disk apparatus spindle motor control system has a control circuit including a frequency generator for generating a master clock signal of a predetermined frequency, a first frequency divider for frequency-dividing the master clock signal by 2.sup.1, 2.sup.2, . . . , 2.sup.N, a second frequency divider for frequency-dividing the signal frequency-divided by 2.sup.N to generate a master index signal upon each rotation of the spindle motor, a time interval detector for detecting a time interval between the master index signal and an index signal output from a magnetic disk unit and outputting a phase control signal and a select signal corresponding to the detected time interval, a data selector for selecting and outputting one of the signals frequency-divided by 2.sup.1, 2.sup.2, . . . , 2.sup.N in accordance with the select signal, a clock window circuit for masking the master clock signal for a time period in accordance with the phase control signal, and a third frequency divider for frequency-dividing the output from the clock window circuit and supplying the frequency-divided signal as the clock signal to the magnetic disk unit.
REFERENCES:
patent: 3893178 (1975-07-01), Sordello
patent: 4357707 (1982-11-01), Delury
patent: 4471390 (1984-09-01), Hamann
patent: 4618897 (1986-10-01), Johnson et al.
Bergmann Saul M.
NEC Corporation
Shoop Jr. William M.
LandOfFree
Spindle motor control system for magnetic disk apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spindle motor control system for magnetic disk apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spindle motor control system for magnetic disk apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1578705