Scott W Henry

US Patent:

47394277, Apr 19, 1988

Filed:

Jan 14, 1987

Appl. No.:

7/003063

Inventors:

Dan L. Kilmer - Reseda CA
Kenneth H. Brown - Simi Valley CA
Scott Henry - Canoga Park CA

Assignee:

Micropolis Corporation - Chatsworth CA

International Classification:

G11B 5012

US Classification:

360 97

Abstract:

A digital storage system of the Winchester or hard disk drive type has the annular, hard aluminum disks mounted coaxially around the drive motor. A central fixed aluminum shaft has the motor stator coils centrally mounted on it, and an aluminum disk mounting sleeve is mounted to the shaft by bearings located above and below the motor stator. To accommodate the difference in thermal coefficients of expansion between the steel cylinder forming the outer periphery of the motor's rotor and the aluminum disk assembly, the outer steel cylinder of the motor rotor is bonded to the aluminum disk sleeve by means of an elastic adhesive, which permits relative expansion between the steel and aluminum parts occasioned by changes in temperature of the drive. The rotor, including its permanent magnets and outer steel cylinder, is mounted from the inner surface of the aluminum disk mounting sleeve, with the rotor in operating proximity to the stator. The aluminum storage disks and the spacers between them are clamped between the top and bottom of the aluminum mounting sleeve.