Patent Number: 6,250,808

Title: Motor having a plurality of dynamic pressure bearings

Abstract: A motor includes a stationary shaft and a rotatable rotor hub disposed about the stationary shaft. The rotor hub is adapted to support a magnetic storage disk such a hard disk. The motor includes thrust oil dynamic pressure bearings that axial support the rotor hub on the stationary shaft. The motor also includes radial gas-lubricated dynamic bearings that radially support the rotor hub on the stationary shaft. The thrust oil dynamic pressure bearings include electrically conductive fluid lubricant that provides a ground between the rotor hub and the stationary shaft thereby preventing undesirable discharges of electrostatic charges that may build up on the magnetic storage disk.

Inventors: Ichiyama; Yoshikazu (Kyoto, JP)

Assignee: Nidec Corporation

International Classification: F16C 33/04 (20060101); F16C 33/10 (20060101); G11B 19/20 (20060101); F16C 032/06 ()

Expiration Date: 06/26/2018