Axial spindle motor for hard disk drive assembly
US5726829A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1996 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Nov 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An in-spindle axial-field motor assembly for a disk storage system includes a stationary baseplate and a cover plate secured to the base to form a housing. Disposed about the cover are cylindrical coils which form a motor stator. The motor assembly includes a rotor having inner and outer hubs disposed within the housing. The inner hub is rotatably mounted and supported by a bearing assembly. The outer hub supports an annular, rigid disk which provides a recording medium for storage of information. An axially-magnetized magnet is disposed between the inner and outer hub with the rotor being positioned between the cover and baseplate such that the net axial force acting on the rotor is minimized during motor operation. Ferromagnetic poles are positioned in the center of each coil to enhance the motor's torque generation capability while implementing an axially force-balanced design.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.