| 摘要 |
A spindle motor includes a base member formed of a magnetic material; a lower thrust member installed in the base member; a shaft fixedly installed on at least one of the lower thrust member and the base member; a sleeve rotatably supporting the shaft by fluid dynamic pressure and disposed above the lower thrust member to form a thrust dynamic pressure bearing together with the lower thrust member at the time of rotation thereof; a rotor hub coupled to the sleeve to rotate together therewith; and an upper thrust member fixedly installed on the shaft to be positioned above the sleeve and forming a thrust dynamic pressure bearing together with the sleeve at the time of rotation of the sleeve, wherein upward thrust dynamic pressure generated between the lower thrust member and the sleeve is greater than downward thrust dynamic pressure generated between the upper thrust member and the sleeve. |
