Patent ID: 7382076

Claim:
The spindle motor disclosed comprises: a rotary spindle having a rotation center; a rotor body provided with a circular rotor secured to the rotary spindle and rotor magnet secured to an external periphery of the circular rotor; an iron core provided with a plurality of magnetic poles having coiling portions and pole-tops provided on both sides of the coiling portion extending from the coiling portion peripherally and a pole base to hold the magnetic poles; a stator having coils wound around a plurality of the magnetic poles; a bearing sleeve holding the bearing to secure the rotary spindle rotatably; and a housing to secure the stator and the bearing sleeve, wherein the rotor body rotates around the rotation center facing the outward periphery of the rotor magnet against the inward periphery of the iron core of the stator, and the inward periphery of the iron core includes a concentrically shaped surface to the outward periphery of the rotor magnet and a pair of flat surfaces, generally perpendicular to a centerline of the magnetic pole, attached to both sides peripherally.