| 摘要 |
<P>PROBLEM TO BE SOLVED: To quickly and surely detect a starting failure in a multiphase multipole motor by highly precisely checking an accelerating state of the multiphase multipole motor. Ž<P>SOLUTION: A back detector 160 generates a back detection signal 161 composed of a pulse string by binarizing back electromotive force that occurs in an each phase, each pole coil of a relevant SPM (spindle motor) 13 in accordance with the rotations of the SPM 13. A time counter 191 measures an interpulse time interval corresponding to samephase and samepole on the basis of the pulse string included in the back detection signal 161. A CPU 19 compares the time interval measured by the time counter 191 with a time interval measured by the time counter 191 ahead of the time interval to detect a starting failure in which the SMP 13 is not normally accelerated during starting the SPM 13. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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