| 摘要 |
PROBLEM TO BE SOLVED: To reduce deformation of a hub in the case of pressing a yoke into the hub. SOLUTION: In a brushless motor 100, the hub 10 has a cylindrical partition put between the yoke 30 and two magnetic recording disks 200. The yoke 30 is fixed on an inner peripheral surface of the partition of the hub 100 by adhesion and pressing. On the inner peripheral surface of the partition, a first recessed part 16 and a second recessed part 18 where the yoke 30 is abutted when the yoke 30 is pressed in are formed. The first recessed part 16 and the second recessed part 18 are circular recessed parts formed around a motor rotary shaft R. The diameter of first recessed part 16 is smaller than that of the second recessed part 18. COPYRIGHT: (C)2010,JPO&INPIT
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