Patent ID: 6608415
Filing Date: 2003-08-19
Classification: F16C,G11B,H02K

Abstract:
A spindle motor characterized in that it comprises: a cylinder of a radial hydrodynamic gas bearing having radial hydrodynamic grooves formed in an outer circumferential surface thereof; a disk of a thrust hydrodynamic gas bearing having thrust hydrodynamic grooves formed in an upper face thereof, the cylinder and the disk being disposed on and supported by an upper end of a stator core on an axial center of the stator core, the stator cow having a stator around which a motor coil is wound; a hollow cylinder whose inner surface facing the cylinder of the radial hydrodynamic gas bearing is smooth; and a rotor magnet facing the motor coil, the hollow cylinder and the rotor magnet being disposed on a hub acting as a rotational member; wherein a load in a radial direction is supported by the radial hydrodynamic gas bearing, and a load in a thrust direction is supported by using the thrust hydrodynamic gas bearing together with a magnetic bearing consisting of the stator and the rotor magnet.