Influence of Drive Current to Unbalanced-Magnetic-Pull in Spindle Motor

Author

Bi, Chao ; Aung, Nay Lin Htun ; Phyu, Hla Nu ; Jiang, Quan ; Lin, Song

Author_Institution

Data Storage Inst.

fYear

2006

fDate

Nov. 29 2006-Dec. 1 2006

Firstpage

1

Lastpage

2

Abstract

Both symmetric and asymmetric armature windings are applied in the spindle motors used in hard disk drives. Consider the influence of the drive current in the windings, the analysis to the unbalanced-magnetic-pull (UMP) generated in the motor becomes more difficult. Besides the intrinsic and extrinsic components, the additional UMP can also induced by the current, and the UMP could thus be serious. This paper analyzes this phenomenon, and presents a model which can describe clearly the influence of the drive current to the UMP. For verifying the effectiveness of the analytic method proposed, several spindle motors are analyzed, and compared with the results obtained by using FE method. The comparing proves the effectiveness of the UMP model presented.

Keywords

DC motor drives; brushless DC motors; disc drives; electric current; hard discs; machine theory; machine windings; magnetic forces; small electric machines; BLDC drive current; FE method; UMP; analytic method; asymmetric armature windings; hard disk drives; spindle motor; symmetric armature windings; unbalanced-magnetic-pull; Bismuth; Chaos; Hard disks; Iron; Magnetic analysis; Magnetic noise; Memory; Rotors; Stator cores; Stator windings; acoustic noise; armature winding; drive current; magnetic field; spindle motor; unbalanced magnetic pull;

fLanguage

English

Publisher

ieee

Conference_Titel

Asia-Pacific Magnetic Recording Conference, 2006

Conference_Location

Singapore

Print_ISBN

1-4244-0863-6

Type

conf

DOI

10.1109/APMRC.2006.365920

Filename

4215305