Extending the Operating Distance of Inductive Proximity Sensor Using Magnetoplated Wire

Inductive proximity sensors are noncontact sensing devices used to detect the approach of a target by an increase in coil resistance due to eddy current loss. Extending the operating distance of these sensors is demanded. In this paper, we propose the use of a magnetoplated wire (MPW) as a sensing c...

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Veröffentlicht in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.4463-4466
Hauptverfasser: Mizuno, T., Mizuguchi, T., Isono, Y., Fujii, T., Kishi, Y., Nakaya, K., Kasai, M., Shimizu, A.
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Sprache:eng
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Zusammenfassung:Inductive proximity sensors are noncontact sensing devices used to detect the approach of a target by an increase in coil resistance due to eddy current loss. Extending the operating distance of these sensors is demanded. In this paper, we propose the use of a magnetoplated wire (MPW) as a sensing coil. The MPW is a copper wire, whose circumference is plated with a magnetic thin film. We analyze the impedance of a proximity sensor using a copper wire (COW) and MPW coils by a finite element method. The use of the MPW results in a decrease in AC resistance due to the proximity effect, an increase in inductance, and the generation of a higher flux than when the COW is used. Therefore, it is possible to increase the quality factor Q of the MPW coil. As a result, the operating distances of the MPW and COW coils are 5.0 and 3.8 mm, respectively. The operating distance of the MPW coil is 1.3-fold that of the COW coil.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2021855