Magnetic disc driving apparatus having speed and position contro

Details Magnetic disc driving apparatus having speed and position contro Magnetic disc driving apparatus having speed and position contro

1989-03-20

1991-08-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, G11B 555

Patent

active

050419277

ABSTRACT:
A magnetic disc driving apparatus for positioning a magnetic head by a servomechanism, which, when control mode of positioning control is switched from speed control to tracking control, switches the tracking control to open-loop control by an optimum compensation quantity at the position and speed of the magnetic head and holds open-loop control for a predetermined time, and which, after the lapse of predetermined time, returns the tracking control to closed-loop control, thereby restricting overshoot of the magnetic head caused during the tracking control and reducing a settling time.

REFERENCES:
patent: 4710865 (1987-12-01), Higomura
patent: 4811133 (1989-03-01), Nakadai et al.
patent: 4845698 (1989-07-01), Baas
R. K. Oswald, Head Positioning Servo Design for the IBM 3344/3350 Disk Files, IEEE Transactions on Magnetics, vol. MAG-14, No. 4, Jul. 1978, pp. 176-177.
Mitsubishi Denkigiho, vol. 59, No. 12, 1985, pp. 11-15.

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