Pumps – Transversely movable impelling member
Patent
1993-12-08
1996-06-04
Freay, Charles
Pumps
Transversely movable impelling member
4174102, 415125, 416 3, 310 25, F04B 1900
Patent
active
055227120
ABSTRACT:
A cooling fan for dissipating heat requiring relatively little electrical power to operate. The fan includes a fan blade, constructed from flexible metal or plastic, anchored at one end and having a permanent magnet mounted at the other end. An external drive mechanism, such as a position sensor or an oscillator, provides a drive pulse to the coil. The fan blade is placed in motion by energizing a coil which is disposed about a core constructed of magnetically permeable material and positioned adjacent the magnet. Upon energization of the coil, the magnet mounted on the blade reacts to the magnetic field generated by the coil, causing the blade to move away from the coil. When the magnet, due to the flexibility of the fan blade, moves back towards the coil, a voltage is induced in the coil by the magnet, thus causing current to flow through the coil to apply a kick or power pulse of magnetic energy to the magnet. This process continues as the blade moves from side to side. The fan blade thus functions as a resonant mechanical oscillator and as it moves, air is caused to move over the device to be cooled.
REFERENCES:
patent: 2152243 (1939-03-01), Daiger
patent: 4063826 (1977-12-01), Riepe
patent: 4498851 (1985-02-01), Kohm et al.
patent: 4595338 (1986-06-01), Kolm et al.
patent: 4684328 (1987-08-01), Murphy
patent: 4780062 (1988-10-01), Yamada et al.
patent: 4834619 (1989-05-01), Walton
patent: 4923000 (1990-05-01), Nelson
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