Patent · US Expired

Disk storage drive for maintaining precision during thermal variations

US5594606A · kind A · utility

9Cited by

23References

13Claims

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	Feb 17, 1995
Grant date	Jan 14, 1997
Priority date	—
Expiry date	Feb 17, 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 (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).

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