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时变电磁场中电磁材料所受斥力和吸力的分析

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Keywords: 电磁材料,电磁力,洛仑兹力,开尔文力

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Abstract:

电磁材料在时变电磁场中所受的电磁力可分为斥力分量和吸力分量,这两种力的分量可由洛仑兹力和开尔文力表达式导出。在正弦稳态场中,斥力分量和吸力分量均含有直流分量和交流分量,两个直流分量相互削弱;在理想情况下,两个分量完全抵消,电磁材料所受的平均合力为零。此现象可用于减小时变电磁场中电磁材料的受力与振动。通过理论分析和数值计算,比较了频率、材料磁导率和电导率对电磁物质所受吸力和斥力的影响;模拟计算了铁磁材料与良导体材料叠层板的受力,给出了一定频率下使平均合力为零的叠层板的厚度比例情况。

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