Spindle motor and disk drive apparatus
a technology of spindle motor and disk drive, which is applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/form/construction, instruments, etc., can solve the problems of inability to rotate the rotating bearing portion, and achieve the effect of optimizing the rotor hub, reducing the amount of lubricating fluid, and preventing the effect of slipping
Active Publication Date: 2015-12-03
NIDEC CORP
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- Application Information
AI Technical Summary
Benefits of technology
This patent describes a spindle motor that reduces the likelihood of gas evaporated from the lubricating fluid escaping the motor. This results in a decrease or prevention of the lubricating fluid level. Additionally, the motor includes a rotor hub that is optimized by using different materials for different parts based on required precision and strength.
Problems solved by technology
If the amount of the lubricating fluid in the fluid dynamic bearing decreases, the rotatable bearing portion may become unable to rotate, or the rotatable bearing portion may come to rotate while being rubbed against the stationary bearing portion.
Method used
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Embodiment Construction
[0022]It is assumed herein that a vertical direction is defined as a direction in which a central axis of a spindle motor extends, and that an upper side and a lower side along the central axis in FIG. 1 are referred to simply as an upper side and a lower side, respectively. It should be noted, however, that the above definitions of the vertical direction and the upper and lower sides are not meant to indicate relative positions or directions of different members or portions when they are actually installed in a device. Also note that a direction parallel to a central axis J1 is referred to by the term “axial direction”, “axial”, or “axially”, that directions perpendicular to the central axis J1 are simply referred to by the term “radial direction”, “radial”, or “radially”, and that a circumferential direction about the central axis J1 is simply referred to by the term “circumferential direction”, “circumferential”, or “circumferentially”.
[0023]Also note that the terms “axial direct...
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Abstract
A motor includes a rotor hub with a first horizontal surface, a cylindrical surface, a second horizontal surface, and a projecting portion. The first horizontal surface is located above the sleeve. The cylindrical surface extends downward from the first horizontal surface. The second horizontal surface is located above a stator. The projecting portion projects downward from the second horizontal surface, and surrounds the sleeve or the holding portion. The cylindrical surface and an outer circumferential surface of the sleeve together define a tapered gap therebetween where the radial distance therebetween decreases with increasing height. The holding portion, the projecting portion, and coils are located radially in this order, and at least portions thereof are positioned to radially overlap with one another.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a spindle motor and a disk drive apparatus.[0003]2. Description of the Related Art[0004]Spindle motors arranged to rotate disks are installed in hard disk drive apparatuses and optical disk drive apparatuses. Such a spindle motor includes a stationary portion fixed to a housing of the apparatus, and a rotating portion arranged to rotate while supporting the disk(s). While the spindle motor is running, a torque centered on a central axis is produced by interaction of magnetic flux generated between the stationary portion and the rotating portion, so that the rotating portion is able to rotate with respect to the stationary portion. A known spindle motor is described, for example, in JP-A 2006-331558.[0005]A so-called fluid dynamic bearing is used as a bearing of the spindle motor described in JP-A 2006-331558. The fluid dynamic bearing includes a stationary bearing portion, a rotatable be...
Claims
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IPC IPC(8): G11B19/20H02K7/08
CPCG11B19/2036G11B19/2045H02K7/086H02K1/30
Inventor SEKII, YOICHI
Owner NIDEC CORP