Method and means for seeking magnetic tracks

Details Method and means for seeking magnetic tracks Method and means for seeking magnetic tracks

1976-10-26

1978-07-04

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

318617, G05B 1300

Patent

active

040991121

ABSTRACT:
In connection with a head positioning device for magnetic disc drives in which a low cost implementation for seeks of varying lengths is important and optimum seek time is secondary, a system is disclosed in which head velocity, at least during the final portion of the deceleration phase, is a linear function of the distance remaining to target. In addition, the system lends itself to the approximation of optimum seek time on long seeks by commanding a velocity curve whose slope exceeds the maximum deceleration of the torquer for all but the final portion of the seek distance so as to provide a maximum acceleration-deceleration profile until just prior to the target, and a final deceleration at a decreasing rate as the head approaches the target.

REFERENCES:
patent: 3241015 (1966-03-01), Allen
patent: 3699555 (1972-10-01), Du Vall
patent: 3721882 (1973-03-01), Helms
patent: 4031443 (1977-06-01), Droux et al.

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