BRUSHLESS MOTOR UNIT

摘要

A brushless motor unit comprises a stator (14) arranged fixedly; a rotor (12) which rotates when the stator is excited sequentially by a plurality of excitation patterns; a magnetic pole position detection magnet (16) firmly adhered to the rotor by having the number of poles equal to two times that of the rotor; and a position detection element (18) arranged oppositely to the magnetic pole position detection magnet and detecting the magnetic pole position of the rotor. The brushless motor unit is further provided with a motor drive circuit for controlling the rotation angle of the rotor to be a half of the rotation angle by a regular excitation pattern by exciting the stator using other excitation pattern between regular excitation patterns used during normal operation.