Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1988-10-18
1991-04-09
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
310156, G11B 516
Patent
active
050069438
ABSTRACT:
A disk storage drive is provided with a brushless drive motor having a stator with a winding. An external rotor coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. The rotor includes a permanent magnet and a soft magnetic yoke. A hub is provided that is concentric to the yoke and is connected to the rotor for rotation therewith. The hub has a disk mounting portion on its outer peripheral surface that can be passed through the central opening of a standardized storage disk for mounting the storage disks for rotation therewith. At least half of the axial longitudinal dimension of the stator winding and the rotor magnet interacting therewith is housed within the disk mounting portion of the hub. The hub is made from a non-ferromagnetic material that is suitable for storage drive clean chamber use after dimensional finishing of the hub.
REFERENCES:
patent: 4438542 (1984-03-01), Schuh
patent: 4519010 (1985-05-01), Elsasser
Elsasser Dieter
von der Heide Johann
Heinz A. J.
Papst-Motoren GmbH & Co. KG
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