| 摘要 |
A brushless motor apparatus includes a fixedly arranged stator 14, a rotor 12 rotated in a manner sequentially excited by a plurality of excitation patterns, a magnetic-pole-position detecting magnet 16 fixed to the rotor and having twice the number of poles of the rotor, and a position detecting element 18 arranged opposite to the magnetic-pole-position detecting magnet and detecting the position of magnetic poles of the rotor, and further includes a motor drive circuit serving as a control such that when the stator is excited with a different excitation pattern between regular excitation patterns on normal operation at the time of phase matching carried out upon actuation of a power source, the rotation angle of the rotor is one-half the rotation angle corresponding to the regular excitation pattern.
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