Non-symmetrical three-lobe bearing spindle technology: a drive technology to increase aerial density

Author

Yoshida, Shinobu ; Kohno, Takashi ; Saegusa, Shozo ; Terayama, Takao ; Yoshida, Takashi ; Hirai, Hiromu ; Hamada, Yosuke ; Yamaguchi, Takashi

Author_Institution

Mech. Eng. Res. Lab., Hitachi Ltd., Tsuchiura, Japan

Volume

32

Issue

3

fYear

1996

fDate

5/1/1996 12:00:00 AM

Firstpage

1721

Lastpage

1726

Abstract

A fluid-film spindle for 2.5 inch hard disk drive is described that effectively reduces nonrepeatable runout to less than 0.05 μm, making it possible to increase track density. The spindle is used with a newly designed three-lobe bearing of which each lobe is asymmetrical. The influence of stiffness and temperature in a prototype spindle using this bearing are discussed and comparisons are made with a conventional ball-bearing spindle

Keywords

hard discs; lubrication; magnetic fluids; magnetic recording; 2.5 inch; aerial density; fluid-film spindle; hard disk drive; magnetic fluid lubrication; nonrepeatable runout reduction; nonsymmetrical three-lobe bearing spindle technology; radial bearing surface; stiffness; temperature effect; track density; Ball bearings; Drives; Hard disks; Information retrieval; Laboratories; Mechanical engineering; Memory; Prototypes; Target tracking; Vibrations;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.492855

Filename

492855