Axle balance plates for miniature heat dissipating fan assemblie

Pumps – Motor driven – Motor within rotary pumping member

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Details

41742314, F04B 1703, H02K 2908

Patent

active

060507853

ABSTRACT:
A miniature heat dissipating fan assembly includes a casing, a circuit board, a balance plate, a stator, a rotor, and a cover plate. The casing includes a compartment and an air outlet communicated with the compartment. A bottom wall that defines the compartment includes a tube seat formed thereon. The circuit board includes a fixing hole so as to be mounted around the tube seat. The balance plate also includes a fixing hole so as to be mounted around the tube seat. The stator includes an axle tube received in the tube seat, while the rotor includes an axle rotatably received in the axle tube, and a fastening member is provided to a distal end of the axle to retain the axle in place. The cover plate is attached to the casing and includes an air inlet. The balance plate is made of magnetic material and mounted below the rotor. A permanent magnet on the rotor and the balance plate attract each other to generate an attraction therebetween. This attraction creates a balancing force for assuring stable rotational movements of the rotor relative to the stator, thereby eliminating noise resulting from vibrations during rotation of the rotor.

REFERENCES:
patent: 4164690 (1979-08-01), Muller et al.
patent: 5699854 (1997-12-01), Hong
patent: 5859486 (1999-01-01), Nakahara et al.
patent: 5947704 (1999-09-01), Hsieh

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