(上海大学 上海市钢铁冶金新技术应用开发重点实验室，
上海 200072)
摘 要: 从Maxwell方程出发，推导并计算了连续交变磁场和调幅交变磁场作用下，圆柱形金属液中电磁力密度在半径方向上的分布及其随时间的变化情况。发现在连续及调幅磁场情况下，电磁力频率均以原输入电磁场频率的两倍变化，且在调幅磁场的线性上升段和下降段，电磁力幅值的变化近似为二次抛物线形，在调幅磁场的恒值段则与连续施加时一样。这为合理设计电磁连铸时的调幅磁场打下基础。
关键字: 调幅磁场；电磁连铸；电磁力
cylinder shape liquid metal under amplitude
modulated alternating magnetic field
（Shanghai Enhanced Laboratory of Ferro-Metallurgy,
Shanghai University, Shanghai 200072, China）
Abstract:The distribution of electromagnetic force along with radius and time in cylinder shape liquid metal under continuous and amplitude modulated alternating magnetic field was deduced and calculated based on Maxwell equation . It is found that the frequency of electromagnetic force is the twice of the magnetic field under both continuous and amplitude modulated condition, and its amplitude changes in a square parabola type while amplitude of magnetic field changes in a linear type.
Key words: amplitude modulated magnetic field; electromagnetic continuo us casting; electromagnetic force
