| 摘要 |
A fluid dynamic bearing spindle motor is provided to prolong a lifetime of the motor by installing the motor in one of at least triple sealing walls which extend a discharge path of a lubricant. A fluid dynamic bearing spindle motor includes a rotor assembly(20), a stator assembly(10) having a fluid dynamic journal bearing(18) and a thrust bearing(19) supporting the rotor assembly when the rotor assembly rotates, and a drive member(30) rotating the rotor assembly. At least triple cylindrical sealing walls are alternatively extended from the rotor assembly and the stator assembly to convert a flow direction of a lubricant, and are spaced apart from each other at regular intervals in a radial direction with respect to a center axis of rotation of the journal bearing, so as to prevent the lubricant from being outwardly discharged.
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