| 摘要 |
<p>There is provided a spindle motor having a high speed rotation and a low vibration with high rotation accuracy and capable of installing discs at locations which are spaced apart from a stator core in a thrust direction while employing fluid dynamic bearings and a pivot bearing. The spindle motor comprises a shaft (28); a bearing housing part (30) formed substantially in a cylindrical shape and having an opening at an upper portion thereof, and provided with fluid dynamic bearings (31, 32) for rotatably supporting the shaft (28) while inserting the shaft (28) into the opening, and a pivot bearing (33); a stator core (35) fitted to an external circumference of the bearing housing part (30) and a coil 34 wound around the stator core (35); a motor hub (21) into which the shaft (28) is fitted at a center thereof and provided with a rotor magnet 27 fitted to an internal circumference thereof so as to oppose the stator core (35) in a radial direction; wherein the motor hub (21) has disc fixing parts (23, 24) provided on an external circumference thereof at least at two locations for fitting discs 25 and 26 thereto; and the fluid dynamic bearings (31, 32) are fitted to an internal circumference of the bearing housing part (30) at least at two locations.
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