Patent ID: 8922091

Claim:
A spindle motor, the spindle motor comprising: a bearing assembly including a hearing housing that has a housing body and a plurality of staircase sills on a side surface of the bearing housing, and a bearing inside the bearing housing, a thickness of the housing body corresponding to a thickness of each staircase sill being gradually changed; a stator including a core and a coil wound on the core, the core including a plurality of core pieces, each core piece having a through hole and coupling to each staircase sill via the through hole, diameters of the through holes being gradually changed corresponding to each staircase sill; a rotation shaft inserted into a rotation shaft hole of the bearing; and a rotor including a yoke coupled to the rotation shaft and a magnet secured at an inner lateral surface of the yoke to face the core; wherein a height of each core piece is configured to be substantially same as a height of each staircase sill such that no gap is formed between each core piece and each staircase sill when each core piece is coupled to each staircase sill.