Spindle motor and recording disk driving device having the same

A spindle motor, comprising:

• a base member formed by performing plastic working on a steel plate and provided with a cylindrical installation part;
• a shaft support part including a sleeve insertedly disposed in the installation part;
• a shaft rotatably supported by the shaft support part;
• a rotor hub fixed to an upper end of the shaft and provided with a driving magnet disposed on an inner circumferential surface thereof;
• and
• a stator core installation member disposed on the base member so as to be disposed outwardly of the installation part in a radial direction and having a stator core fixedly installed thereon so that one end of the stator core faces the driving magnet,
• wherein the stator core installation member includes a body part, the inner surface of which is bonded to an outer circumferential surface of the installation part and the bottom surface of which is bonded to an upper surface of the base member, an installation wall part extending from an upper surface of the body part so as to facilitate bonding thereof to the inner circumferential surface of the stator core, and a support part having a support surface supporting the bottom surface of the stator core, and
• the rotor hub is provided with an extending wall extending from a bottom surface thereof to form a labyrinth seal with the installation wall part.