Motor for driving storage disks
US6211592A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2000 |
| Grant date | Apr 3, 2001 |
| Priority date | — |
| Expiry date | Mar 27, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A storage-disk drive motor miniaturized and made thinner by eliminating the conventional thrust plate for the rotor-hub thrust dynamic pressure-generating bearing, and by employing only one rotor-hub radial dynamic pressure-generating bearing. The motor is inner-rotor type wherein the rotor magnet is radially inward of the stator. To maintain thrust bearing rigidity absent the thrust plate, the stator/bracket and the rotor magnet are configured such that magnetism between them imparts a energizing force to the rotor hub biasing it axially, and at the same time, specially striated dynamic-pressure-generating grooves in the rotor hub bearings generate thrust to balance this energizing force. Due to the special rotor-hub bearing configuration, the means for venting the lubricant retained in the bearing micro-gaps are modified accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.