Spindle motor having hydrodynamic bearing

Details Spindle motor having hydrodynamic bearing Spindle motor having hydrodynamic bearing

1996-08-06

1998-05-12

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 51, H02K 700, H02K 524

Patent

active

057510806

ABSTRACT:
The invention relates to a structure of a spindle motor. The spindle motor comprises a housing assembly arranged downward of a cover and having an inner cylindrical portion; a stator secured to circumferential outer surface of the inner cylindrical portion of the housing assembly; a spindle hub provided above the housing assembly and having an outer cylindrical portion; a rotor magnet secured to circumferential inner surface of the outer cylindrical portion of the spindle hub; a hydrodynamic bearing formed in the inner cylindrical portion of the housing assembly; a rotating shaft having one end secured to the spindle hub to integrally rotate with the spindle hub and the other end positioned in the hydrodynamic bearing; and restrainer disposed between the cover and the one end of the rotating shaft to restrain axial movement of the rotating shaft to a predetermined extent.

REFERENCES:
patent: Re34412 (1993-10-01), Elsaesser et al.
patent: 4803576 (1989-02-01), Ohkita et al.
patent: 5138477 (1992-08-01), Omura et al.
patent: 5200866 (1993-04-01), Fruge et al.
patent: 5422769 (1995-06-01), Elsaesser et al.
patent: 5557487 (1996-09-01), Elsaesser et al.

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