Ferrofluid-cooled electromagnetic device and improved cooling me

Details Ferrofluid-cooled electromagnetic device and improved cooling me Ferrofluid-cooled electromagnetic device and improved cooling me

1993-12-14

1995-10-31

Willis, Jr., Prince

Compositions

Magnetic

Iron-oxygen compound containing

252 6252, 252 6251, 252 6255, 361699, 174 151, 174 17LF, 336 58, 336 94, H01F 144, H05K 500

Patent

active

054626854

ABSTRACT:
A convection-cooled electromagnetic device, such as a transformer, and methods of cooling that utilize a ferrofluid as a cooling medium. The device's leakage magnetic field, which can be augmented by auxiliary magnets, draws the ferrofluid toward the device. As the fluid approaches the device its temperature rises, resulting in loss of magnetic properties and a decrease in density. The ferrofluid rises as its temperature approaches the Curie point, since the gravitational effect of density reduction begins to overcome the weakening magnetic attraction. Movement of hot ferrofluid is strongly assisted by the attraction exerted by the device on cooler, more intensely magnetic ferrofluid, which displaces the hot ferrofluid. The displaced ferrofluid cools as a result of movement from the heat source and through contact with the walls of the housing. Preferably, the Curie temperature of the ferrofluid is close to or slightly higher than the operating temperature of the device.

REFERENCES:
patent: 3316178 (1967-04-01), Millington
patent: 4094804 (1978-06-01), Shimoiizaka
patent: 4788867 (1988-12-01), Kishel
patent: 5248861 (1993-09-01), Kato et al.
patent: 5382373 (1995-01-01), Carlson et al.
T. Atarashi et al., 85 Journal of Magnetism and Magnetic Materials 203 (1990) (month unknown).
E. Blums et al., Thermomagnetic Properties of Ferrofluids Containing Chemically Coprecipitated Mn-Zn Ferrite Particles (date unknown).
Excerpt from S. W. Charles and J. Popplewell, Ferromagnetic Liquids (Date Unknown).

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