Quiet ferrofluid solenoid with cushion

Details Quiet ferrofluid solenoid with cushion Quiet ferrofluid solenoid with cushion

1998-03-26

1999-09-21

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

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

Patent

active

059559349

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. A cushion located between the plunger and a butt toward which it moves also reduces the noise, while the ferrofluid maintains a relatively high solenoid force relative to a solenoid with air gaps.

REFERENCES:
patent: 4306207 (1981-12-01), Tada et al.
patent: 4419643 (1983-12-01), Ojima et al.
patent: 4422060 (1983-12-01), Matsumoto et al.

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