| 摘要 |
PURPOSE: An axis fixing-type motor structure is provided to use a shaft as a fixing body, and to use a hub where plural platters are mounted as a revolution body, thereby preventing vibrations caused by rigidity deterioration from being generated and recording high-capacity information. CONSTITUTION: A core(130) is fixed to a housing(100) which is fixed to a lower fixing body. One end of a fixing block(180) is coupled with a center of the housing(100), and a coupling groove(181) is formed on the other end. A shaft(140) is located in the middle of the coupling groove(181), and is coupled with the fixing block(180). A sleeve(120) forms a fluid dynamic pressure bearing by forming an oil gap at an interval with the shaft(140), and is rotatively combined with the coupling groove(181). A hub(150) has a magnet(160) attached thereat as rotating together in connection with the sleeve(120), and forms an air dynamic pressure bearing. The first and second thrust plates(171,172) form fluid dynamic pressure bearing surfaces. An upper finishing cap(210) is coupled with an upper section of the sleeve(120), and is rotatively supported on an upper end of the shaft(140).
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