| 摘要 |
In a spindle motor, in an upper portion of a stator bearing surrounding wall 32 a of a bearing housing 32, a flange 32 c projecting outward in the radial direction from the stator bearing surrounding wall 32 a is provided, and a tapered face 32 e obtained in such a manner that the outer diameter of the bearing housing 32 gradually decreases downward from the flange 32 c is formed in the outer face of the stator bearing surrounding wall 32 a. A rotor 2 has a yoke 23 facing the bearing housing 32 in the radial direction and the air-fluid boundary is formed in a fifth clearance 40 between the tapered face 32 e and the inner face of the yoke 23. By the yoke 23 and the flange 32 c which are fit to each other in a non-contact state, a detachment preventing structure is constructed.
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