| 摘要 |
PURPOSE: A motor magnet is provided to improve the structure of the motor magnet by using yokes. CONSTITUTION: A yoke(100) is provided with a yoke core(200). A back yoke(400) which has a recessed portion(402) on the inner surface thereof is provided. A spatial portion(410) is formed between the outer peripheral surface of the magnet(200) and the inner peripheral surface of the back yoke(400). By forming the recessed portion(402) on the inner surface of the back yoke(400), the distance from the yoke(100) is different. The magnetic flux which is transferred to the back yoke is different according to the inner peripheral surface.
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