Performance of a rotary actuator in a disk drive

Details Performance of a rotary actuator in a disk drive Performance of a rotary actuator in a disk drive

2005-06-07

2005-06-07

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078060, C360S077020, C318S561000, C318S632000

Reexamination Certificate

active

06903897

ABSTRACT:
A method for improving the performance of a rotary actuator in a disk drive, the rotary actuator comprises a voice coil motor (VCM) characterized by a torque parameter, the disk drive comprises a servo control system having a motor driver circuit for receiving a series of command effort signals (CEFs) transmitted based on a first seek profile, and for providing an operating current to VCM based on the CEFs for causing a movement of the actuator from a first radial location to a target radial location. The method includes recording the transmitted CEFs, and while actuator is moving: adjusting each recorded CEF to account for a disk drive influence on actuator movement; storing adjusted CEFs; monitoring velocity of moving actuator; calculating an acceleration value corresponding to moving actuator from the stored CEFs and monitored velocity; and adjusting the acceleration value to account for a radial torque parameter variation.

REFERENCES:
patent: 5119250 (1992-06-01), Green et al.
patent: 5793558 (1998-08-01), Codilian et al.
patent: 5898286 (1999-04-01), Clare et al.
patent: 6781787 (2004-08-01), Codilian et al.
patent: 2004/0001278 (2004-01-01), Andress et al.

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