Title:
段差を介した予圧発生構造の組み合わせ型動圧軸受スピンドルモータ
Document Type and Number:
Japanese Patent JP3888552
Kind Code:
B2
Abstract:
Disclosed is a spindle motor for hard disk drives capable of generating mechanical and electrical preloads to form a predetermined sized air gap through use of mechanical and electrical offsets, so that the spindle motor is prevented from being damaged by friction and heat generated during an initial starting. The spindle motor with mechanical and electrical offsets is designed so that a midpoint of the vertical width of the poles wound around by a coil of a stator is placed within a magnetic field so as not to be flush with a midpoint of the vertical width of a permanent magnet fitted on the inner circumferential surface of the hub, and each of the poles has at least one of its upper and lower end extending in a vertical direction by a predetermined length to distribute magnetic flux density differently between the upper and lower ends of each pole.
Inventors:
Kim Sang Wook
Application Number:
JP2003548244A
Publication Date:
March 07, 2007
Filing Date:
November 28, 2002
Export Citation:
Assignee:
G&W Technologies Incorporated
International Classes:
F16C17/10; H02K21/22; F16C39/06; G11B5/55; G11B19/20; G11B21/02; H02K7/08
Domestic Patent References:
| JP10341553A | ||||
| JP2000197309A | ||||
| JP6296353A |
Attorney, Agent or Firm:
Yukio Murata
Masaaki Ban
Masaaki Ban