Motor for driving storage disks, and storage disk drive device provided therewith
US6339270B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 2000 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Jan 3, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An axial-gap type storage disk drive motor and storage disk drive configuration is disclosed. The motor includes a stator around retaining cylinder retaining a support sleeve, a storage-disk-carrying rotor, and radial and thrust bearings having striation patterns on the bearing surfaces to develop controlled radial and thrust load-bearing dynamic pressure in an intervening lubricating fluid. The thrust bearing is formed between the upper end of the support sleeve and the rotor. A set of salient poles projecting axially inward is furnished on a bottom face of the rotor hub, axially opposing the stator. The configuration establishes a reluctance type motor: energizing the stator magnetically attracts axially the salient poles on the rotor hub in imparting rotational power thereto. Meanwhile, the magnetic attractive force imparted in the rotor is designed to balance the thrust load-bearing pressure generated in the thrust bearing. The configuration enables the motor to be made thinner and eliminates the need for rotor magnets, curtailing the number of parts, reducing costs, and preventing magnetic contamination caused by magnetic powder/particles from the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.