| 摘要 |
PCT No. PCT/GB89/00231 Sec. 371 Date Nov. 6, 1990 Sec. 102(e) Date Nov. 6, 1990 PCT Filed Mar. 8, 1989 PCT Pub. No. WO90/10930 PCT Pub. Date Sep. 20, 1990.A system and method for controlling the movement of a member, particularly the heads of a disk file, to a specified position in a predetermined path, makes use of an electromagnetic responsive to control signals and to position reference information and a transducing means for reading such information to produce a position signal. The position signal is sampled regularly and, together with the actuator control signal, used to update a velocity estimator. During the deceleration phase of the movement, a new actuator control signal is generated at each sample time from the square of the estimated velocity divided by the computed distance-to-go to the specified position.
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