Patent · US Expired

Disk storage device having spindle assembly with ring enclosure

US5796548A · kind A · utility

2Cited by

33References

18Claims

0Family size

Assignee

Papst Licensing GmbH · DE

Inventors

Helmut Hans · St. Georgen, DE
Jurgen Oelsch · Bad Neustadt an der Saale, DE

Key dates

Filing date	Jun 7, 1995
Grant date	Aug 18, 1998
Priority date	—
Expiry date	Jun 7, 2015

Classification

Technology area (CPC G)Physics
CPC primaryG11B33/14
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

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

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.