System for positioning a transducer

Details System for positioning a transducer System for positioning a transducer

1991-02-08

1992-09-29

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

G05B 19407

Patent

active

051516390

ABSTRACT:
The present invention proposes a system for positioning a control object such as a magnetic head by moving the object at a high velocity without generation of vibration. An actuator loads the magnetic head and an arithmetic control device controls a drive motor of the actuator based on a result of digital arithmetic determination. The arithmetic control device computes target position, target velocity and target acceleration of each sample period in accordance with polynomials indicating predetermined target position, target velocity and target acceleration. The arithmetic control device then outputs at least one error between a) the target position or target velocity as a result of determination and b) position or velocity of the magnetic head at every sample period and controls the drive motor with an added output of the position error or velocity error and target acceleration as a result of the determination.

REFERENCES:
patent: 4137728 (1979-02-01), Durville
patent: 4679103 (1987-07-01), Workman
patent: 4720754 (1988-01-01), Mizoshita et al.
patent: 4761595 (1988-08-01), Goor
patent: 4769583 (1988-09-01), Goor
patent: 4878135 (1989-10-01), Makino et al.
"Digital Servo Control for Head-Positioning of Disk Drives", Susumu Hasegawa et al, Fujitsu Scientific & Technical Journal, Winter 1990, vol. 26, No. 4, Feb. 1991, pp. 378-390.

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