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Vol. 94, Issue 7, July 2008, pp.170-175




Repulsive-Magnets-Type Acceleration Limit Switch


*Kazuhiro Nishimura, ** Mitsuteru Inoue

*Department of Electrical and Electronic Engineering, Suzuka National College of Technology, Shiroko-cho, Suzuka, 510-029 Mie, Japan

Phone and fax: +81-59-368-1862, e-mail: kazuhiro@elec.suzuka-ct.ac.jp

**Department of Electrical and Electronic Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tenpaku, Toyohashi, 441-8580 Aichi, Japan

Phone and fax: +81-532-47-0120, e-mail: inoue_mitsuteru@eee.tut.ac.jp



Received: 5 June 2008   /Accepted: 21 July 2008   /Published: 31 July 2008


Abstract: We have developed a repulsive-magnets-type vibration limit switch. This limit switch employs the magnetic switching phenomenon of a mechanical structure by effecting a change in the magnetization of the magnetic material between repulsive magnets in the structure. The plot of switching acceleration vs. frequency shows a resonance frequency that is close to the frequency range of human motion. The resonance frequency and magnitude of switching acceleration are controlled by the components of the limit switch.


Keywords: Repulsive magnets; Accelerometer; Acceleration limit switch; Magnetic switching phenomenon


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