Analysis and design of ferrite cores for eddy-current-killed oscillator inductive proximity sensors

Author

Anim-Appiah, Kofi D. ; Riad, Sedki M.

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

33

Issue

3

fYear

1997

fDate

5/1/1997 12:00:00 AM

Firstpage

2274

Lastpage

2281

Abstract

Finite element modeling of ferrite cores used in the design of eddy-current-killed oscillator inductive proximity sensors was performed. Based on contemplation of the practical operation of the sensors, ferrite core geometries were compared with a reference core by the eddy-current power loss in a metal target at a fixed distance from the face of each transducer. Several of these cores were experimentally evaluated for sensing distance to verify the results of the simulation. It was observed that, for fixed coil, fixed target distance, and given target, the low-frequency sensing distance of a particular transducer is approximately proportional to the fourth root of eddy-current power loss in the target

Keywords

distance measurement; eddy current losses; eddy currents; ferrite devices; finite element analysis; magnetic cores; magnetic sensors; distance sensing; eddy-current power loss; eddy-current-killed oscillator inductive proximity sensor; ferrite core; finite element simulation; transducer; Capacitive sensors; Circuits; Eddy currents; Electromagnetic induction; Ferrites; Frequency; Inductors; Magnetic sensors; Oscillators; Transducers;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.573843

Filename

573843