| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure of a DC motor output shaft that is not influenced by a magnet coupling. SOLUTION: A counter magnet 60, which is made to oppose a rotor yoke 44 of a magnetic material that is fixed to and rotatably driven by the motor output shaft 30, is fixedly arranged at the opening end of a bearing metal 42 of the motor output shaft 30 arranged at the center of a stator 46 of a brushless DC motor 16 of an outer rotor type. The rotor yoke of the magnetic material 44 is sucked by a reaction force that exceeds a reaction force produced by the magnet coupling 26, and the output shaft 30 is drawn to the direction opposed to the suction of the magnet coupling 26. An end plane 30a in the direction where the output shaft 30 is drawn is supported by a thrust bearing 58 by a constant press-contact force, thus enabling a rotor 52 to rotate stably. COPYRIGHT: (C)2003,JPO
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