Disk-drive motor rotating on a magnetically counterbalanced single hydrodynamic thrust bearing
US6456458B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 25, 2001 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | Jul 25, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Reduced axial height, compact disk-drive motor rotating on a hydrodynamic radial bearing and a magnetically counterbalanced single hydrodynamic thrust bearing. The single hydrodynamic thrust bearing is configured between the underside of the rotor hub and the adjacent end face of a support cylinder in which the motor shaft rotates. To make the motor rotationally operable, instead of another hydrodynamic thrust bearing, the reduced axial-height configuration employs magnetic counterbalancing means associated with the cylindrical wall of the rotor hub. The magnetic counterbalancing means counterbalances thrust hydrodynamic lifting pressure generated in the single thrust-hydrodynamic pressure bearing and acting on the rotor hub when it spins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.