Disk storage drive for maintaining precision during thermal vari

Details Disk storage drive for maintaining precision during thermal vari Disk storage drive for maintaining precision during thermal vari

1995-02-17

1997-01-14

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

369269, 310 67R, 310 90, 310154, G11B 1702, H02K 516

Patent

active

055946062

ABSTRACT:
A disk storage drive is provided with a brushless drive motor having a stator (34) with a winding. An external rotor housing (32) including a permanent magnet (33) coaxially surrounds the stator and is spaced therefrom by a substantially cylindrical air gap. A hub (31) is provided that is concentric to the rotor housing (32) and is connected to the rotor housing for rotation therewith. A bearing (47) above the stator rotatably supports an upper end of the rotor housing on a stationary shaft (46) and a bearing (37) below the stator braces the open end of the rotor housing by a ring element (35) having substantially the same heat expansion characteristics as the rotor housing (32).

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