| 摘要 |
<p>Means to prevent wear from occurring due to a contact sliding of a thrust dynamic pressure bearing surface at the time of start of a spindle motor, wherein a cylindrical column (4) of a radial dynamic pressure bearing having a radial dynamic pressure generating groove in the outer peripheral surface thereof and a disk (3) of a thrust dynamic pressure bearing having a thrust dynamic pressure generating groove in the upper surface thereof are installed at the axial upper end of a stator core (2) having a stator (2a) with a motor coil (7) wound thereon, a cylinder (6) having a smooth inner surface facing the cylindrical column (4) of the radial dynamic pressure bearing and a rotor magnet (8) facing the motor coil (7) are disposed in a hub (5) as a rotating member, and a load in radial direction is supported by the radial dynamic pressure bearing and a load in thrust direction is supported by the combined use of a magnetic bearing comprising the stator (2a) and rotor magnet (8) and the thrust dynamic pressure bearing.</p> |
