Servo method and device for controlling head position for a hard

Details Servo method and device for controlling head position for a hard Servo method and device for controlling head position for a hard

1995-06-28

1997-11-11

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, G11B 5596

Patent

active

056870388

ABSTRACT:
A target PES value input from a controller and a value from a PES value calculator which corresponds to the displacement of a magnetic head are synthesized. A coefficient applicator applies a predetermined coefficient K.sub.1 to the above deviation (multiplication), and a variable coefficient applicator applies a coefficient K.sub.a to the resulting value. The coefficient K.sub.a is varied and set in the variable coefficient applicator in accordance with a value input from a table. The correspondence between the target PES value and the coefficient K.sub.a used as a feedback coefficient for the PES value is stored in the table in advance so that the coefficient K.sub.a is small when the PES value varies sharply and so that the coefficient K.sub.a is large when the PES value is small. The variable coefficient applicator outputs, to a driver, a value to which the coefficient K.sub.a has been applied in accordance with the value from the table.

REFERENCES:
patent: 5404255 (1995-04-01), Kobayashi et al.
patent: 5436773 (1995-07-01), Hanson
patent: 5457586 (1995-10-01), Solhjell
patent: 5500776 (1996-03-01), Smith
Ueno, Servo-Information Demodulation Control System, Apr. 2, 1991 Patent Abstract of Japan for JP 03-76055.
Hirose, Magnetic Disk Device, Apr. 23, 1993 Patent Abstract of Japan for JP-05-10135b.

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