Calculation of Skin Depths and Eddy-Current Power Losses for Magnetic Position Sensors  

作　　者：Chung-Ping Liu (Department of Electrical Engineering, Yuan Ze University, Chungli 320, Taiwan-China Yeong-Hwa Chang and Tsung-Kun Lin (Department of Electrical Engineering, Chung Cheng Institute of Technology, Taoyuan 335, Taiwan-China Kun-Tong Wu and Ch 

出　　处：《Journal of Materials Science & Technology》2000年第2期244-245,共2页材料科学技术（英文版）

摘　　要：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.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.

关 键 词：Calculation of Skin Depths and Eddy-Current Power Losses for Magnetic Position Sensors 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]