| 摘要 |
PROBLEM TO BE SOLVED: To normally stop a disk with an inexpensive motor having no Hall element, etc., with less fluctuation in detective precision, without depending on hardware and without complicated control for speed detection in a disk rotation controller rotating the disk by servo drive of a constant linear velocity. SOLUTION: A brake amount is obtained considering a rotational speed difference between the inner periphery and the outer periphery of the disk from the beforehand obtained brake amount Bin for stopping the rotation when a servo is applied in the innermost periphery of the disk, the brake amount Bout for stopping the rotation when the servo is applied in the outermost periphery and a present position X where the servo is applied.
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