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Finite Element Model of a Magnet Driven Reed Switch

B. LaBarge[1], and E. Gutierrez-Miravete[2]

[1]Gems Sensors and Controls, Plainville, CT, USA
[2]Rensselaer at Hartford, Hartford, CT, USA
Published in 2008

A simple proximity sensing circuit is made using magnets actuating reed switches; these switches are wired into a larger circuit that performs auxiliary functions. The success or failure of such systems is a function of their position.

A simulation using COMSOL Multiphysics is conducted to study the position of a reed switch relative to a magnet when the switch opens and closes. Ability to predict reed switch operation reduces testing time, time to market. The finite element model has done particularly well in predicting the correct operating locations of a reed switch within a magnetic field.

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