| 摘要 |
A system and method are provided for sealing a fluid dynamic bearing motor. A first and a second folded fluid channel are shaped for maximizing bearing axial span and establishing angular stiffness, to resist gyroscopic rocking of the facing bearing surfaces. The first folded fluid channel is limited to occupying at least a portion of the same axial space as the bearing. A first and a second fluid sealing system are connected to opposite axial ends of the bearing. The first fluid sealing system forms an active pumping seal to pump fluid during motor rotation. In an aspect, a top cover attached shaft, and a single thrust surface are employed, allowing for a rigid motor structure and power reduction in applications including high rotational speed disc drives. Also, by employing a rigid shaft design, significantly lower amplitude radial vibration responses are exhibited at higher frequencies than prior art motor designs.
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