| 摘要 |
A motor apparatus having a rotor placed rotatably on a stator base, and providing a FG signal for controlling the rotation of the rotor. The motor apparatus further includes driving magnet for having a plurality of magnetic poles placed on the outer circumference of the rotor and having a magnetic flux density pattern magnetized either third or fifth harmonic component, and FG coil provided on the circumference of the rotor in the position opposing to the magnetic pole for driving magnet, for supplying the FG signal by occurrence of an electric signal for magnetomotive force in the magnetic field. The driving magnet of the motor apparatus is having a magnetic flux density which reaches to the FG coil within the range of 0.2 to 0.6 T (Tesla) so that inequable rotation of the motor can be suppressed.
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