| 摘要 |
PURPOSE: A fluid dynamic bearing spindle motor is provided to reduce the size of the motor by using both a journal bearing and a spherical bearing, and achieve improved operating characteristics of the motor by suppressing conical vibrations during rotation of the motor. CONSTITUTION: A fluid dynamic bearing spindle motor comprises a rotating member which is rotatably supported at a fixed member by a fluid bearing unit. The fluid bearing unit includes a housing having a coupling hole formed at the center thereof, and a core(130) formed concentrically with the coupling hole; a lower sleeve(121) fixed in the coupling hole, and which has a first inner surface and a first spherical inner surface; a shaft(140) having a bottom rotatably coupled to the lower sleeve; a bearing block coupled to the shaft, and which has an upper spherical surface, a lower spherical surface, and a circumferential surface formed between the upper and lower spherical surfaces; an upper sleeve(122) coupled to the lower sleeve so as to cooperate with the lower sleeve to form a space having a shape corresponding to the shape of the bearing block, wherein the upper sleeve has a second inner surface and a second spherical inner surface; a hub(150) having a center connected to the shaft, and an extended end with an inner surface on which a magnet(160) is attached for generating electromagnetic force through a cooperation with the core; and a thrust cover(180) coupled to the bottom of the lower sleeve in such a manner that the thrust cover supports the shaft.
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