Disk drive spindle motor with externally mounted flux concentrator ring
US4985792A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Mar 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/2009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A disk drive spindle motor includes an improved mounting arrangement for Hall sensors and an associated flux concentrator ring. The spindle motor comprises a compact dc motor having a driven rotor hub adapted to support one or more computer disks within a substantially sealed disk drive housing. A timing magnet is mounted at one axial end of the rotor hub in close proximity with Hall sensors seated within individual sensor ports and electrically connected directly to appropriate conductors on the exterior of the housing. The Hall sensors are supported by a flux concentrator ring which is mounted against the housing exterior to overlie and close the sensor ports, and further to concentrate the magnetic flux path through the Hall sensors. Such concentration of the flux path substantially isolates the timing magnet from the computer disks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.