Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1982-06-28
1984-10-16
Truhe, J. V.
Electricity: motive power systems
Positional servo systems
With stabilizing features
318565, 360 78, G05B 501, G05B 2302
Patent
active
044777558
ABSTRACT:
A disk drive control circuit designed to eliminate undesirable mechanical resonances that occassionally occur in the disk drive system as a result of a particular combination of seek commands. The control circuit uses an electrical model of the mechanical system in order to estimate or predict whether a particular seek command is likely to excite a mechanical resonance. The electrical model may be a filter network having frequency response characteristics similar to the mechanical system. The current used to drive a linear motor of the mechanical system is then applied to the filter network. The signal output from the filter network, which network effectively models the mechanical system, is thus representative of the mechanical response of the system upon performance of the seek operation. This signal output is monitored, and if it exceeds a predetermined threshold level, steps are taken to alter the system response so as to avoid exciting the mechanical resonance.
REFERENCES:
patent: 4133011 (1979-01-01), Kurzweil
patent: 4219767 (1980-08-01), Wimmer
Gold Bryant R.
Keane Patrick
Storage Technology Corporation
Truhe J. V.
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