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为了减少感应加热设备零件中自身的损耗,通过对铜和不锈钢两种材料在交变磁场中吸收能量的分析发现:两种不同电阻率材料吸收的电磁能量存在一个临界尺寸,在临界尺寸以上时,铜吸收的能量小于不锈钢吸收的能量,在临界尺寸以下时,铜吸收的能量大于不锈钢吸收的能量。同时,临界尺寸不是一个定值,而是和磁场方向,电阻率,频率等因素相关,是两种材料相比较而存在的。可用垂直于磁场方向的截面尺寸与电流透入深度的比值来描述。
In order to reduce the loss of induction heating equipment components, the analysis of the absorption energy of copper and stainless steel in alternating magnetic field shows that there is a critical size for the electromagnetic energy absorbed by the two different resistivity materials. Above the critical size , Copper absorbs less energy than stainless steel absorbs, and below the critical size, copper absorbs more energy than stainless steel absorbs. At the same time, the critical size is not a fixed value, but the magnetic field direction, resistivity, frequency and other factors, is the existence of two materials compared. It can be described by the ratio of the cross-sectional dimension perpendicular to the magnetic field to the penetration depth of current.