Magnetic fluid bearing

Details Magnetic fluid bearing Magnetic fluid bearing

1990-06-20

1991-07-16

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

384133, F16C 3374, F16C 1710, F16C 3906, F16C 3206

Patent

active

050327518

ABSTRACT:
A magnetic fluid bearing may include a sleeve provided with a through bore, a shaft inserted into the bore, electromagnets engaged with the bore of the sleeve with a gap provided between the shaft and the electromagnets, a magnetic fluid introduced into the gap between the electromagnets and the shaft, and a controller for modifying the magnetic force of the electromagnets in accordance with changes in a load condition of the bearing. One or more electromagnets for radial loads may be engaged with the sides of the bore and an electromagnet for thrust loads may be engaged with a bottom of the bore. The controller has a sensor to detect changes in an inductance or capacitance that are indicative of the position of the shaft. The controller translates the changes into signals and transmits the signals to a power amplifier to modify the position of the shaft by changing the rate of electric current running through the electromagnets.

REFERENCES:
patent: 4526484 (1985-07-01), Stahl et al.
patent: 4645960 (1987-02-01), Hoffman
patent: 4692699 (1987-09-01), Brunet et al.
patent: 4938611 (1990-07-01), Nil et al.
patent: 4983869 (1991-01-01), Vaidya et al.
"Junkatu Handbook", 1970, pp. 596, 597.

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