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Spindle motor and disk drive apparatus

A disk drive device and spindle motor technology, applied in the direction of electromechanical devices, electric components, synchronous motors with stationary armatures and rotating magnets, etc., can solve the problems of time-consuming and different, and achieve the effect of high-efficiency flow

Inactive Publication Date: 2013-09-11
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the radial gap structure and the axial gap structure, the arrangement of the various parts in the motor is completely different. Therefore, in order to improve the manufacturing efficiency or driving efficiency of the motor in the axial gap structure, it takes time and effort to consider and Different structure of radial gap structure

Method used

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  • Spindle motor and disk drive apparatus
  • Spindle motor and disk drive apparatus
  • Spindle motor and disk drive apparatus

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Embodiment Construction

[0024] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In addition, in this application, the direction parallel to the central axis of the spindle motor is called "axial direction", and the direction perpendicular to the central axis of the spindle motor is called "radial direction". The direction of the arc at the center is called "circumference". In addition, in the present application, the shape and positional relationship of each part will be described with the axial direction as the vertical direction and the rotor magnet side as the upper side with respect to the stator. However, it is not intended to limit the directions of the spindle motor and the disk drive device in use according to the present invention through the definitions of these vertical directions.

[0025] In addition, in the present application, "parallel directions" also include substantially parallel directions. In addition, the "orthogonal...

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Abstract

The invention provides a spindle motor and a disk drive apparatus. The spindle motor includes a flat stator, a rotor magnet arranged above the stator, and a magnetic portion made of a ferromagnetic material. The magnetic portion is positioned lower than the stator and the magnetic portion are axially overlapped with coils. A magnetic attraction force is generated between the magnetic portion and the rotor magnet. Since the magnetic portion is positioned lower than the stator, it is possible to cause magnetic fluxes to efficiently flow between the rotor magnet and the stator. Further, the stator includes a protrusion protruded radially outward beyond an outer circumferential portion of a rotor hub. Accordingly, in a plan view, the stator is positioned radially outward of the rotor hub.

Description

technical field [0001] The invention relates to a spindle motor and a disk drive device. Background technique [0002] A spindle motor for rotating a disk is mounted on the hard disk drive. For example, SG185981 describes a conventional spindle motor. The permanent magnet synchronous motor described in this publication includes a permanent magnet mounted on at least one of a top yoke and a bottom yoke, and an armature disposed in an air gap between the permanent magnet and the other yoke. Inside. [0003] Compared with the so-called radial gap structure in which the armature and permanent magnets are radially opposed to each other, the so-called axial gap structure described in SG185981 is advantageous for the motor. Thinning. However, in the radial gap structure and the axial gap structure, the arrangement of the various parts in the motor is completely different. Therefore, in order to improve the manufacturing efficiency or driving efficiency of the motor in the axial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/14G11B17/02
CPCH02K21/24G11B17/0282G11B19/2009H02K1/182H02K3/47H02K2211/03
Inventor 角茂治
Owner NIDEC CORP