J Mater Sci Technol ›› 2000, Vol. 16 ›› Issue (02): 244-245.

• Research Articles • Previous Articles     Next Articles

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 and Chang-Shen Yu, Der-Ray Huang, Tai-Fa Ying, Shyh-Jier Wang   

  1. Department of Electrical Engineering, Yuan Ze University, Chungli 320, Taiwan-China...
  • Received:1999-07-12 Revised:1999-08-25 Online:2000-03-28 Published:2009-10-10
  • Contact: Chung-Ping Liu

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 toil 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.

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