Magnetic head position controller in a magnetic recording and re

Details Magnetic head position controller in a magnetic recording and re Magnetic head position controller in a magnetic recording and re

1992-04-17

1995-01-24

Wolfe, Willis R.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 5588

Patent

active

053846761

ABSTRACT:
In a magnetic recording and reproducing apparatus having a solenoid-driven actuator to move a magnetic head in the tracking direction, a magnetic head position controller includes a state estimator for estimating the moving speed of the actuator from a drive voltage and a drive current supplied to the actuator; and a damping control loop for feeding back the estimated speed signal estimated by the state estimator to the actuator drive voltage. The state estimator is formed of a combination of equivalent circuits that electrically simulate modeled characteristics of the solenoid-driven actuator and receives the drive voltage and the drive current of the actuator and produces the estimated speed signal representing the speed of the actuator. The state estimator includes equivalent circuits that electrically simulate a drive coil resistance and inductance characteristic of the solenoid-driven actuator; a force constant of a magnetic circuit of the solenoid-drive actuator; and an inertia, a spring constant, and a counter electromotive force of the solenoid-driven actuator.

REFERENCES:
patent: 4080636 (1978-03-01), Ravizza
patent: 4296443 (1981-10-01), Sakamoto et al.
patent: 4389686 (1983-06-01), Isaka et al.
patent: 4393416 (1983-07-01), Takeuchi et al.
patent: 4412259 (1983-10-01), Hiraguri
patent: 4774606 (1988-09-01), Uhde
patent: 4910615 (1990-03-01), Monard
patent: 5034829 (1991-07-01), Mahr

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