Patent ID: 8727623

Claim:
A spindle motor including a rotating part in which a hub is coupled to a rotating shaft and a fixing part in which a sleeve is coupled to the rotating shaft, wherein: the sleeve rotatably supports the rotating shaft; the fixing part comprises a support supporting a lower portion of the rotating shaft and coupled to the sleeve; a thrust hydrodynamic bearing part is formed in a micro-gap between the lower portion of the rotating shaft and an upper portion of the support; the rotating shaft has a thrust hydrodynamic bearing groove formed on a lower end thereof for forming the thrust hydrodynamic bearing part, or the support has a thrust hydrodynamic bearing groove formed on a upper end thereof for forming the thrust hydrodynamic bearing part, and the thrust hydrodynamic bearing groove is rotated several times, has radius of gyration gradually decreasing from outside to inside thereof, and is a scroll groove with one start point and one ending point, and the scroll groove has a plurality of openings between the one start point and the one ending point.