| 摘要 |
PURPOSE: A spindle motor is provided to make the inner periphery of sleeve a curved shape protruded to a rotary shaft and to improve dynamic pumping. CONSTITUTION: A spindle motor includes a rotating unit and a fixing unit. The rotating unit includes a rotary shaft, an herb and a magnet. The fixing unit includes a sleeve(140) and an armature. The sleeve is a sintered sleeve formed by a sintering process. The inner periphery of the upper and the lower part is protruded in the axis direction of the sleeve. |
