Motor and hard disk drive including the same
There are provided a motor and a hard disk drive including the same. The motor includes: a sleeve supporting a shaft with a lubricating fluid; and a rotor fixed to the shaft, rotating together therewith, and having a surface facing the sleeve, wherein one surface of the surface of the rotor facing the sleeve and a surface of the sleeve facing the rotor is provided with a thrust dynamic pressure groove, and the other surface of the surface of the rotor facing the sleeve and the surface of the sleeve facing the rotor is provided with an extension groove extended to the outside of the thrust dynamic pressure groove so as to partially face the thrust dynamic pressure groove.
Samsung Electro-Mechanics Co., Ltd.
F F F F G
F16C F16C F16C F16C G11B
inventional additional additional inventional inventional
Ju Ho Hyo Seok Yong Il
Kim Lee Kwon