Patent ID: 7042821

Claim:
A disk drive apparatus for driving, by means of a motor, a disk mounted thereon so as to reproduce signals recorded in said disk, comprising: edge signal generating means for generating, in accordance with a plurality of voltages induced when said motor is driven, edge signals indicating a switch timing among phases of the voltages; and drive voltage control means for controlling, in accordance with said edge signals, the maximum value of a drive voltage for driving said motor, wherein said drive voltage control means includes: transition period computing means for computing transition period of said maximum value, based on an interval between the edge signals; timing control means for controlling, in accordance with said edge signals, at least the timing of a start of transition of said maximum value or the timing of an end of transition of said maximum value; a maximum limiter value determining circuit which generates a limiter signal that suppresses the attracting and repulsion forces acting between a rotor and a stator of said motor; and a maximum value limiting circuit that outputs the drive voltage at a level below said maximum value based on the generated limiter signal, wherein said drive voltage control means controls said maximum value based on the timing of the start or the end of the transition and said transition period.