Brushless DC motor

Abstract

A brushless DC motor. The motor includes a rotating shaft, a bearing rotatably supporting the rotating shaft in radial directions, a support holder made of a plastic material and supporting both the lower end of the rotating shaft and the outer circumferential surface of the bearing, a rotor casing having a rotor magnet therein and rotated along with the rotating shaft, a stator mounted to the outer circumferential surface of the support holder so as to face the rotor magnet and rotating the rotor casing by mutual cooperation with the rotor magnet in response to electricity applied from an external power source, and a plate, to which the support holder is locked using a locking screw. The brushless DC motor has a simple structure and reduces the material cost and assembly cost.

Description

[0001] Cross references to related applications [0002] This application claims the priority of Korean Patent Application No. 10-2009-0117951 named "Brushless DC Motor" with the filing date of December 1, 2009, the entire contents of which are incorporated herein by reference. in. Technical field [0003] The invention relates to a brushless DC motor. Background technique [0004] Generally, in a brushless DC motor used to rotate an optical recording medium such as an optical disc or a hard disk, the lubricating oil forms an oil film between the bearing and the rotating shaft and rotatably supports the rotating shaft, thereby realizing the height of the rotating shaft. With high precision rotation performance, the brushless DC motor has been widely used as a drive motor for recording medium drives (such as hard disk drives and optical disk drives) that require high-speed rotation. [0005] figure 1 It is a partial cross-sectional view of a traditional brushless DC motor. Below, th...

AI Technical Summary

Problems solved by technology

[0009] However, in the conventional brushless DC motor 10 having the above structure and manufactured through the above process, the bearing housing includes the bearing support 22, the washer support 24 and the plate 26 as described above, so the motor 10 requires an additional cost. expense of the additional installation process, thus increasing the manufacturing cost of

Specifically, the use of caulking or spinning to assemble the bearing support 22 with the plate 26 and the bearing support 22 with the washer support 24 resulted in plastic deformation of the elements, so the product The quality of the

Further, when the quality of the product deteriorates due to the plastic deformation of the components, it is very difficult to disassemble and reassemble the components, so the components must be discarded, thereby incurring processing costs

[0010] In addition, the bearing support 22 is made of brass, and the washer support 24 and plate 26 are made of steel plate, so the support and plate increase the material cost and cutting cost, which runs counter to the current trend of light weight

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