IEC 61000-4-8中矩形感应线圈磁场均匀性缺陷的分析
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摘要
首先推导了矩形感应线圈的磁感应强度空间分布解析表达式,通过数值仿真分析磁感应强度沿各轴向的变化趋势和磁场空间分布特性,指出现有标准定义的3 dB试验区域内存在12个磁感应强度基准偏差超出±3 dB的缺陷区域,并对分析结果进行实验验证。
Firstly,the analytical expressions of magnetic field spatial distribution in rectangular inductive coil are deduced.The variation trend of magnetic induction strength variation along different axial directions and the spatial distribution characteristics of magnetic field are analyzed by numerical simulation.It is pointed out that there are 12 defective areas in the 3 dB test area defined by the existing standard where the reference deviation of magnetic induction intensity exceeds ±3 dB.The results are experimentally verified.
Firstly,the analytical expressions of magnetic field spatial distribution in rectangular inductive coil are deduced.The variation trend of magnetic induction strength variation along different axial directions and the spatial distribution characteristics of magnetic field are analyzed by numerical simulation.It is pointed out that there are 12 defective areas in the 3 dB test area defined by the existing standard where the reference deviation of magnetic induction intensity exceeds ±3 dB.The results are experimentally verified.
引文
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[2]Marino A A,Wolcott R M,Chervenak R,et al.Nonlinear response of the immune system to power-frequency magnetic fields[J].American Journal of Physiology Regulatory Integrative&Comparative Physiology,2000,279(3):R761.
[3]Murano K,Shiokawa A,Kami Y.Three directional Helmholtz coils for a lowfrequency-magnetic-field immunity test[C]//International Symposium on Electromagnetic Compatibility.Tokyo:IEEE,1999:79-81.
[4]Casamento J P.Comparison of magnetic fields emitted from security screening devices with magnetic field immunity standards[C]//IEEE International Symposium on Electromagnetic Compatibility.Minneapolis:IEEE,2002:937-940.
[5]Coenen M,Kathari B.Low-frequency magnetic-field immunity surface scan method[C]//IEEE International Symposium on Electromagnetic Compatibility.Dresden:IEEE,2015:1022-1025.
[6]International Electrotechnical Commission.IEC 61000-4-8Electromagnetic compatibility(EMC)-Part 4-8:Testing and measurement techniques-Power frequency magnetic field immunity test[S].2009.
[7]赵凯华,陈熙谋.电磁学(第二版)[M].北京:高等教育出版社,1985:352-357.
[8]施鼎南.产生均匀磁场的方体线圈[J].电测与仪表,1992(04):16-23.