Patent ID: 7030527
Filing Date: 2006-04-18
Classification: H02K

Abstract:
1. A data storage device comprising: a storage disk configured to store data; a fluid dynamic bearing motor configured to rotate the storage disk; and a base configured to receive the fluid dynamic bearing motor; wherein the fluid dynamic bearing motor comprises a stator that is secured to the base; and a rotor that rotates in response to a rotating magnetic force applied by the stator, said rotor having a magnet unit; and wherein the base is made of a magnetic material and has a convex part that is formed at a position facing the magnet unit, the convex part being an integrally formed part of the base that is made of the magnetic material, the convex part protruding toward the magnet unit, the convex part being spaced from the magnet unit by a gap which is unoccupied and adjusted to control a magnetic back pressure generated between the convex part of the magnetic base and the magnet unit, the base having a corresponding concave part on a surface opposite from the convex part.