SPINDLE MOTOR FOR DRIVING DISK

摘要

PURPOSE: A spindle motor for driving a disk is to form a vent hole with a certain distance in a rotor yoke of which magnet is formed to decrease a vibration occurrence by an eccentricity of a disk. CONSTITUTION: A spindle motor for driving a disk comprises: a rotation axis(50) installed in a hole of a rotor yoke(36); a turntable(60) for stably receiving a disk installed in the rotation axis(50); a rotor having a magnet coupled to the turntable(60); a U shape ball case(40) coupled to the turntable(60), which an asperity is formed to be coupled to a lower portion of the turntable(60), wherein a plurality of asperity is formed at the lower portion of the ball case(40). Since a concentric to the axis of the ball case is useful by using the turntable, the ball case is attached to the external point of the rotor yoke.