SPINDELMOTOR.

摘要

A spindle motor comprising a stator (5) including a support shaft (2) positioned on a base, a cap-shaped rotor (6) rotatably and concentrically disposed around the support shaft, thrust and radial bearings (3, 4) disposed between the stator and the rotor, a stator coil (5) secured to the stator, and a rotor magnet member (6) secured to the rotor in opposing relation to the stator coil. The thrust and radial bearings are hydrodynamic bearings. A movable piece that constitutes a part of the thrust bearing is secured to the lower end of a cylindrical portion of the rotor and extended outwardly or inwardly from the cylindrical portion, or is disposed above the rotor. The stator coil (5) is secured to the outer peripheral portion of the support shaft above or below the radial bearing. The rotor magnet member (6) is secured to the inner peripheral surface or ceiling of the rotor. Either a radial or axial gap is provided between the stator coil and the rotor magnet member.