Fluid contact for a DC machine

Details Fluid contact for a DC machine Fluid contact for a DC machine

1974-08-01

1976-10-05

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310178, H02K 1300

Patent

active

039847152

ABSTRACT:
This invention concerns an improvement in a fluid contact arrangement employed in a DC machine. The invention provides a contact fluid which is interposed between the rotor and the stator of the machine. The fluid is ferromagnetic. Further, the invention provides a magnetic field which is directed perpendicular to the air gap. The effect of the magnetic field on the ferromagnetic contact fluid is such that the fluid is retained within the gap both when the rotor is at a standstill and when it operates at its normal speed.

REFERENCES:
patent: 2615945 (1952-10-01), Jaeschke
patent: 2783643 (1957-03-01), Sihvoner
patent: 2990485 (1961-06-01), Lee
patent: 3163792 (1964-12-01), Sayers
patent: 3168666 (1965-02-01), Grobel
"Magnetic Fluids and Applications Sketches," Machine Design, (Ferrofluidics Corp.), 6/14/74.

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