Servo system for track accessing and track following in a disk d

Details Servo system for track accessing and track following in a disk d Servo system for track accessing and track following in a disk d

1978-11-27

1980-08-12

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318653, 360 77, 360135, G11B 556, G11B 2108, G11B 2110

Patent

active

042176123

ABSTRACT:
During the access mode of a movable magnetic head in a disk file, a program of position control signals is derived from a simulator, the input of which is clocked at sector time intervals. The position control signals of the simulator are periodically transferred to the summing point of a servo loop which successively is error conditioned, dependent on the subsequent nominal magnetic head positions derived from the simulator. Servo sectors on the data disk are sampled by the magnetic head, evaluated and converted to a digitally coded position error signal. The error signal is summed with a digital position control signal, and the output sum signal in analog form is applied to the motor that drives the head. The track following function is accomplished by means of a closed servo loop, which is also used in the access mode.

REFERENCES:
patent: 3185972 (1965-05-01), Sippel
patent: 3691543 (1972-09-01), Mueller
patent: 3737883 (1973-06-01), Sordello et al.
patent: 3881184 (1975-04-01), Koepcke et al.
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 4048660 (1977-09-01), Dennison et al.
patent: 4087843 (1978-05-01), Louis et al.
patent: 4135217 (1979-01-01), Jacques et al.

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