Position control in disk drive system

Details Position control in disk drive system Position control in disk drive system

1979-02-28

1981-05-26

Witkowski, S. J.

Electricity: motive power systems

Positional servo systems

With compensating features

318646, 360 77, 360 78, G05D 23275

Patent

active

042700736

ABSTRACT:
A voice coil type linear motor controls the movement and positioning of a transducer which cooperates with a spinning disk. The motor is feedback controlled for separate speed (seek) and positioning modes in which respectively the transducer is moved across the disk towards a different track and is held centered above that track. In order to offset the effect of a tilted axis of carriage movement, the control condition in the positioning mode representing a correct transducer position in which it is held by the motor, is continuously sampled and held during a period when the transducer is moved to another track to be applied as correction for the control moving the transducer towards another track. This correction signal is also used in the initial phases of holding the transducer above the newly selected track, until sampling and positioning control proper takes over.

REFERENCES:
patent: 3405257 (1968-10-01), Rantsch et al.
patent: 3775655 (1973-11-01), Du Vall
patent: 3818502 (1974-06-01), Chien et al.
patent: 3827333 (1974-08-01), Hurd
patent: 3916279 (1975-10-01), Kawano et al.
patent: 4149199 (1979-04-01), Chick et al.
patent: 4149201 (1979-04-01), Card
Mantey, "Offset Force Correction for Disk File", IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. 1978, pp. 1792-1795.

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