如何合理地选择导体的尺寸和截面形状减低趋肤效应的影响
电流的趋肤效应,也称集肤效应。在直流电路中均匀导线横截面上的电流密度是均匀的。但在导线流过交变电流时,根据楞次定律会在导线内部产生涡流,与导线中心电流方向相反。
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由于导线中心较导线表面的磁链大,在导线中心处产生的电动势就比在导线表面附近处产生的电动势大。这样作用的结果,电流在表面流动,中心则无电流,这种由导线本身电流产生之磁场使导线电流在表面流动。趋肤效应使导线的有效面积减小,等效电阻增加。
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以下通过计算和分析,说明趋肤效应对常用的圆铜线和扁铜线等的影响程度,以及如何合理的选择导体的尺寸和截面形状减低趋肤效应的影响;因为上传公式,经常出乱码,串行,就这样传截图了。
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