Development of an HDD Spindle Motor With Increased Stiffness and Damping Coefficients by Utilizing a Stationary Permanent Magnet

Author

Jang, G.H. ; Lee, C.I.

Author_Institution

Dept. of Mech. Eng., Hanyang Univ., Seoul

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2570

Lastpage

2572

Abstract

This research proposes a novel design of a hard-disk-drive spindle motor with increased stiffness and damping coefficients. It has the permanent magnet in the sleeve, which generates the stationary attractive magnetic force. It results in the static eccentricity of the rotating spindle, which increases the stiffness and damping effect of fluid dynamic bearings. The performance of the proposed design is verified by the experiment, as well as by the numerical simulation. The experiment shows that the proposed design decreases the nonrepeatable vibration by 10% when the eccentricity increases by 0.2 mum in the given motor

Keywords

disc drives; hard discs; machine bearings; magnetic forces; micromotors; numerical analysis; permanent magnets; HDD spindle motors; damping coefficients; dynamic bearings; hard disk drive; magnetic force; numerical simulation; static eccentricity; stationary permanent magnets; Damping; Fluid dynamics; Hard disks; Lubricants; Magnetic forces; Maxwell equations; Permanent magnet motors; Permanent magnets; Shafts; Vibrations; Fluid dynamic bearings (FDBs); hard disk drive (HDD); nonrepeatable runout (NRRO); spindle motor;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.892862

Filename

4202780