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Spindle motor and disc driving device

A spindle motor and axial technology, applied in the direction of electromechanical devices, electric components, synchronous motors with stationary armatures and rotating magnets, etc., can solve the problem of bending of magnetic components, cost increase of spindle motors, and edge displacement of magnetic components Positioning and other problems, to achieve the effect of suppressing the increase in the number of parts

Inactive Publication Date: 2011-06-08
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, if the magnetic member is thinned in the axial direction in order to reduce the thickness of the spindle motor, the magnetic member is prone to local bending
In this case, if the adhesive is not sufficiently applied all the way to the lower surface of the edge portion of the magnetic member, the edge portion of the magnetic member tends to be displaced to the magnet side.
[0006] On the other hand, if a specific component is provided to prevent displacement of the edge portion of the magnetic member to the magnet side, the number of components of the spindle motor will increase.
The increase in the number of parts is the main reason for the increase in the cost of the spindle motor

Method used

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  • Spindle motor and disc driving device
  • Spindle motor and disc driving device
  • Spindle motor and disc driving device

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Embodiment Construction

[0024] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. Hereinafter, the shape and positional relationship of each member will be described with the direction along the central axis as the vertical direction and the direction in which the substantially cup-shaped housing portion of the base member opens as the upward direction. However, this defines the up-and-down direction for convenience of description, and does not limit the postures of the spindle motor and the disk drive device in use according to the present invention.

[0025] figure 1 It is a partial longitudinal sectional view of the spindle motor 102 according to one embodiment of the present invention. Such as figure 1 As shown, the spindle motor 102 has a stationary part 103 and a rotating part 104 . The rotating part 104 is rotatably supported with respect to the stationary part 103 .

[0026] The rotating part 104 has a magnet 143 . On the other h...

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Abstract

The invention provides a spindle motor and a disc driving device, wherein the spindle motor comprises a magnetic part fixed on a base and axially facing towards a magnet at an interval, and an insulating sheet arranged between the base and a coil to electrically ensure electrical insulation between the base and the coil. The insulating sheet has a cover part for covering upper surface of the radical edge of the magnetic part.

Description

technical field [0001] The present invention relates to a spindle motor and a disk drive. Background technique [0002] A spindle motor that rotates a disk around its central axis is installed in a hard disk drive or an optical disk drive. The spindle motor has a stationary part fixed to the device case and a rotating part supporting and rotating the disk. The spindle motor generates torque around a central axis by using magnetic flux generated between the stationary part and the rotating part, thereby rotating the rotating part relative to the stationary part. [0003] Some of the conventional spindle motors have a magnetic member for attracting the rotating part toward the stationary part. The magnetic member is fixed to the stationary portion, and an axial magnetic attraction force is generated between the magnetic member and the magnet on the rotating portion side. For example, Japanese Patent Application Laid-Open No. 2001-309605 describes a magnetic ring that is att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/12H02K5/00G11B19/20
Inventor 西村秀树关井洋一八幡笃志白井宏和
Owner NIDEC CORP
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