Digital servo system for moving body by a distance equal to an i

Details Digital servo system for moving body by a distance equal to an i Digital servo system for moving body by a distance equal to an i

1989-02-07

1992-05-05

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7806, 369 32, 318560, 318600, G11B 555, G11B 2108

Patent

active

051113490

ABSTRACT:
A digital servo system for moving a body, such as the magnetic head of a disk drive, by a distance equal to an integral multiple of a predetermined pitch includes a velocity control unit for causing the body to move at maximum acceleration to a predetermined maximum velocity during a first acceleration mode, to move at the maximum velocity during an optional first coast mode, to decelerate from the maximum velocity to an optional intermediate velocity during a first deceleration mode, to move at the intermediate velocity during an optional second coast mode, and to declerate at the maximum acceleration/deceleration rate to zero velocity during a second deceleration mode. The maximum acceleration/deceleration rate is set equal to a rational multiple of the pitch divided by the square of the sampling time of the digital servo system. Respective first through fifth durations of the acceleration mode, first optional coast mode, first deceleration mode, second optional coast mode, and second deceleration mode are suitably set so that the body travels by a distance equal to an integral multiple of the pitch.

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