Hydrodynamic bearing including means for monitoring the capacita

Details Hydrodynamic bearing including means for monitoring the capacita Hydrodynamic bearing including means for monitoring the capacita

1997-04-09

1999-08-10

Do, Diep N.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324686, G01R 2726

Patent

active

059364106

ABSTRACT:
A hydrodynamic bearing is disclosed which includes a shaft and a rotor rotating relative to one another and defining a hydrodynamic bearing in the gap between the relatively rotating parts. Also disclosed is a method for identifying or signaling potential failure of the hydrodynamic bearing. The method for identifying or signaling potential failure includes a capacitance detector for generating a signal representing the capacitance across the gap defining the hydrodynamic bearing, a comparator for comparing the capacitance to an established threshold, and an indicator for providing a signal indicating that operation of the information storage device incorporating the hydrodynamic bearing should continue or that an interruption is likely.

REFERENCES:
patent: 4823071 (1989-04-01), Ding et al.
patent: 5402680 (1995-04-01), Korenaga
patent: 5513539 (1996-05-01), McLaughlin et al.

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