Non-electromagnetic interference generating cooling fan

Details Non-electromagnetic interference generating cooling fan Non-electromagnetic interference generating cooling fan

1997-03-12

1999-12-07

Freay, Charles G.

Pumps

Motor driven

Electric or magnetic motor

41742314, F04B 3504

Patent

active

05997267&

ABSTRACT:
A non-electromagnetic interference generating cooling fan includes a case, an impeller pivotally fitted within the case and formed with a cylindrical recess, a magnetic conductive sleeve fixedly arranged within the cylindrical recess thereby enclosing a bottom and vertical surface of the cylindrical recess, an annular ring-like rotor made of permanent magnet fixedly fitted within the sleeve, a stator fitted within the rotor, and a multi-layer printed circuit board fixedly mounted on a top of the stator and within the case, whereby the rotor and stator are enclosed within a magnetic conductive device so as to prevent the magnetic lines of force from getting out of the fan thereby keeping a computer from electromagnetic interference.

REFERENCES:
patent: 3700358 (1972-10-01), Papst et al.
patent: 4428719 (1984-01-01), Hayashibara et al.
patent: 4519010 (1985-05-01), Elsaesser et al.
patent: 4604665 (1986-08-01), Muller et al.
patent: 5176509 (1993-01-01), Schmider et al.

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