Actuator bias prediction using lookup-table hysteresis modeling

Details Actuator bias prediction using lookup-table hysteresis modeling Actuator bias prediction using lookup-table hysteresis modeling

1997-04-30

1999-02-16

Tran, Thang V.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, G11B 5596

Patent

active

058726748

ABSTRACT:
An actuator system for positioning a transducing head on an actuator arm over a selected track of a rotatable disc having a plurality of concentric tracks is disclosed. The actuator arm includes a motor responsive to an actuator signal and a bias signal to move the head with respect to the tracks. The actuator signal is applied to the motor to move the head between tracks on the disc. After the head has been moved between tracks, the bias signal is applied to the motor to center the head over the selected track. A lookup table is provided to store predicted bias values in locations addressable by seek direction, previous seek direction, seek length and head position. The bias signal is applied in response to a selectively accessed predicted bias value.

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"A State Space Bias Model for Prediction of Actuator Tracking Bias in Hard Disk Drives" by Kyle Eddy and William Messner (presented and distributed at the Nov. 1995 Winter Annual Meeting of the ASME).

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