Title :
Back-EMF ZCP Error Induced by Electromagnetic Structure of Spindle Motor
Author :
Bi, C. ; Hla, N.P. ; Jiang, Q. ; Soh, C.S.
Author_Institution :
Data Storage Inst., A*Star, Singapore, Singapore
fDate :
7/1/2011 12:00:00 AM
Abstract :
In a hard disk drive (HDD), the zero crossing points (ZCPs) of back-EMF generated in the spindle motor armature windings are used as rotor position signal for realizing precision motor speed control. The error of ZCP is a major concern, especially for HDDs with ultrahigh data recording densities. In the paper, several causes that induce the ZCP error are analyzed, and these problems are induced during the motor design and production. Both the analytical and numerical methods are used in the analysis to study the influence of the electromagnetic structure on the ZCP. Solutions are then proposed to reduce the errors of the ZCP during the motor design phase.
Keywords :
angular velocity control; disc drives; hard discs; machine control; machine windings; synchronous motor drives; back-EMF ZCP error; electromagnetic structure; hard disk drive; motor design phase; motor speed control; rotor position signal; spindle motor armature windings; synchronous motor drives; zero crossing points; Magnetic domains; Magnetic separation; Permanent magnet motors; Stator windings; Synchronous motors; Windings; Back-EMF; data recording; magnetic motive force; permanent magnet; speed control; speed error; synchronous motor drives; winding;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2157895
