| 摘要 |
There are provided a lubricating oil composition for a fluid dynamic bearing, and a HDD motor fabricated using the same. The lubricating oil composition includes an ester base oil and 0.01 to 3.00 parts by weight of an additive relative to 100 parts by weight of the base oil and has a density of 0.900 g/cm3 or less at 15° C. and a kinetic viscosity of 9.50 cSt or less at 40° C. According to the present invention, the HDD motor is fabricated by using a lubricating oil composition for a fluid dynamic bearing, the lubricating oil composition having advantages such as low viscosity at practical temperature, reduced evaporation loss and enhanced oxidation stability, thereby improving impact resistance and low temperature operational stability of a fluid dynamic motor.
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