Quiet ferrofluid solenoid

Details Quiet ferrofluid solenoid Quiet ferrofluid solenoid

1996-08-28

1999-10-19

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335257, 335280, 335279, 335281, 335229, 335234, H01F 300

Patent

active

059695897

ABSTRACT:
A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic field strength within the solenoid to retain the ferrofluid within the solenoid.

REFERENCES:
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patent: 4090112 (1978-05-01), Selverstone
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patent: 5268662 (1993-12-01), Uetsuhara et al.
patent: 5277281 (1994-01-01), Carlson et al.
Patent Abstracts of Japan, vol. 6, No. 147 (E-123), Aug. 6, 1982 & JP 57 071108 A (Aisin Seiki Co. Ltd.), May 1, 1982.
Patent Abstracts of Japan, vol. 18, No. 3 (E-1485), Jan. 6, 1994 & JP 05 251228 A (Matsushita Electric Works Ltd.), Sep. 28, 1993.
Patent Abstracts of Japan, vol. 5, No. 145 (E-074), Sep. 12, 1981 & JP 56 079408 A (Matsushita Electric Works Ltd.), Jun. 30, 1981.
Patent Abstracts of Japan, vol. 6, No. 247 (E-146), Dec. 7, 1982 & JP 57 145565 A (Mitsubishi Denki KK), Sep. 8, 1982.

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