Electricity: motive power systems – Positional servo systems
Patent
1994-01-31
1995-11-07
Ip, Paul
Electricity: motive power systems
Positional servo systems
318561, 360 75, 360 7806, 360 7804, G11B 2102
Patent
active
054650348
ABSTRACT:
A silent seek servo controller is used in a low profile miniature disk drive to minimize acoustic noise and the problems associated therewith. The silent seek servo controller of this invention reduces acoustic noise generation at the expense of seek performance. Since the silent seek servo controller of this invention minimizes acoustic noise, the controller helps to eliminate vibrations within the computer. The silent seek servo controller is a one mode continuous position servo seek controller that accelerates and decelerates the actuator using a smooth, continuous and completely symmetric acceleration trajectory. Specifically, for a seek time t, the disk drive actuator is accelerated for one-half the seek time, i.e, time t/2, and decelerated for the other half of seek time t. The peak acceleration occurs at time t/4 and the peak deceleration occurs at time 3t/4. The symmetry of each acceleration phase assures that any acoustic noise generated by uneven acceleration is eliminated.
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Andrews, Jr. Thomas L.
Counts Gary E.
Gunnison Forrest E.
Integral Peripherals, Inc.
Ip Paul
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