Patent ID: 8552606

Claim:
A spindle motor comprising: a shaft; a first sleeve rotatably supporting the shaft by fluid dynamic pressure; a second sleeve provided outwardly of the first sleeve; a stator core mounted on an outer surface of the second sleeve; and a base member including a mounting part protruding upwardly in an axial direction and fixed to at least one of the first and second sleeves, wherein a hub is coupled to the upper end of the shaft, a thrust dynamic pressure bearing is formed between the hub and a surface of the first sleeve facing the hub, and a radial dynamic pressure bearing is formed between the shaft and a surface of the first sleeve facing the shaft, the hub includes a main wall portion extended downwardly in the axial direction, the main wall portion is extended between the first sleeve and the second sleeve, and a lower surface of the main wall portion is positioned below an upper surface of the first sleeve and the second sleeve, and the second sleeve is provided with a core seating part protruding outwardly in the radial direction and at least a part of an upper surface of the stator core is seated on the core seating part.