| 摘要 |
A spindle motor including a bearing means which is not seized under the high speed rotational operation and with reduced fretting wear. Consequently, the densification of the hard disk drive device can be achieved. A spindle motor comprising a spindle shaft, a rotor, and a bearing means interposed between the spindle shaft and the rotor, the bearing means includes inner and outer rings and rolling elements interposed therebetween, wherein the inner and outer rings of the bearing means are made of steel, and the rolling elements are made of ceramic.
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