| 摘要 |
PROBLEM TO BE SOLVED: To provide a brushless motor in which a low current can be achieved without causing a deterioration factor of running torque while reducing the size and thickness of the brushless motor. SOLUTION: In the brushless motor, a rotor magnet 70 is secured to the outer circumferential surface of a cylinder 42 of a rotor hub 40, and a cancel board 80 is secured to a stage 41a formed at the lower end of the cylinder 42. When a magnetic circuit is formed between the rotor magnet 70 and the cancel board 80, flux flowing from the rotor magnet 70 to a base 10 can be reduced. The stator 20 side of the rotor magnet 70 is not covered with the cancel board 80, and an extremely small magnetic bias is generated. Impact resistance during nonrotation can be enhanced by the magnetic bias. COPYRIGHT: (C)2007,JPO&INPIT
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