Title :
Effects of unbalanced magnetic pull in spindle motors
Author :
Bi, C. ; Liu, Z.J. ; Low, T.S.
Author_Institution :
Data Storage Inst., Nat. Univ. of Singapore, Singapore
fDate :
9/1/1997 12:00:00 AM
Abstract :
This paper analyzes the effects of the unbalanced-magnetic-pull developed in spindle motors for hard disk drives. An analytical technique is used in the investigation which is based on magnetic circuit and field theory. Computational results show that the UMP development is closely related to the magnetic structure, armature winding and armature current of the spindle motors
Keywords :
brushless DC motors; electromagnetic forces; hard discs; machine theory; machine windings; magnetic circuits; permanent magnet motors; analytical technique; armature current; armature winding; brushless DC motor; computational results; hard disk drives; magnetic circuit theory; magnetic field theory; magnetic structure; permanent magnet spindle motors; rotor; surface mounted PM ring; unbalanced magnetic pull effects; Acoustic noise; Difference equations; Induction motors; Magnetic analysis; Magnetic fields; Magnetic flux; Performance analysis; Permanent magnet motors; Rotors; Stator windings;
Journal_Title :
Magnetics, IEEE Transactions on
