Calculation of skin depths and eddy-current power losses for magnetic position sensors

Chung Ping Liu*, Yeong Hwa Chang, Tsung Kun Lin, Kun Tong Wu, Chang Shen Yu, Der-Ray Huang, Tai Fa Ying, Shyh Jier Wang

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We present a theoretic model to calculate skin depths and eddy-current power losses for a magnetic position sensor. Eddy-current, arised from the operation of an alternating-current excitation, induces secondary currents and fields between magnetic material and magnetic position sensor. In this paper, a magnetic position sensor system is simplified to be an outer-winding coil along the axial direction of a low carbon steel bar. The analytical model is derived from basic field and circuit theory considering a linear approximation for a nonlinear permeability. Thus the skin depths and eddy-current power losses from the model in eddy-current modeling techniques at various frequencies of an excited current source can be calculated. The proposed configuration is capable of predicting the skin depths and eddy-current power losses for a magnetic position sensor and has a consistence with experiments.

Original languageEnglish
Pages (from-to)244-245
Number of pages2
JournalJournal of Materials Science and Technology
Volume16
Issue number2
StatePublished - Mar 2000

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