Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1989-03-06
1991-01-15
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9807, 360 9701, G11B 1702, G11B 1704
Patent
active
049857924
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.
REFERENCES:
patent: 4658312 (1987-04-01), Elsasser et al.
patent: 4701653 (1987-10-01), Merkle et al.
patent: 4818907 (1989-04-01), Shirotori
patent: 4843500 (1989-06-01), Elsasser et al.
patent: 4858044 (1989-08-01), Crapo
Seagate Technology Inc.
Sniezek Andrew L.
Tupper Robert S.
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