Loss estimation and sensing property enhancement for eddy-current-type proximity sensor

Author

Koibuchi, Koichi ; Sawa, Koichiro ; Honma, Takashi ; Hayashi, Takumi ; Ueda, Kuniyoshi ; Sasaki, Hiroshi

Author_Institution

Dept. of Syst. Design Eng., Keio Univ., Yokohama

Volume

42

Issue

4

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

1447

Lastpage

1450

Abstract

Eddy-current-type proximity sensor is a noncontact-type sensing device to detect the approach of a conductor by an increase of coil resistance due to eddy current loss. This paper investigates electromagnetic (EM) characteristics of the actual proximity sensor by the finite-element method and provides knowledge to enhance sensing property. In particular, the influence of eddy current loss to sensing property is shown and quantitatively estimated. Furthermore, modified models of the actual sensor are proposed and calculated as numerical experiments. As a result, enhanced sensing properties of the proposed models are shown

Keywords

eddy currents; electric current measurement; electric sensing devices; finite element analysis; coil quality factor; eddy current loss; finite-element method; loss estimation; noncontact-type sensing device; proximity sensor; sensing property enhancement; Coils; Conducting materials; Conductors; Eddy currents; Equations; Finite element methods; Magnetic sensors; Q factor; Sensor phenomena and characterization; Sensor systems; Coil quality factor; eddy current loss; proximity sensor;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.871421

Filename

1608489