(上海大學 上海市鋼鐵冶金新技術(shù)應(yīng)用開發(fā)重點實驗室，
上海 200072)
摘 要: 從Maxwell方程出發(fā)，推導(dǎo)并計算了連續(xù)交變磁場和調(diào)幅交變磁場作用下，圓柱形金屬液中電磁力密度在半徑方向上的分布及其隨時間的變化情況。發(fā)現(xiàn)在連續(xù)及調(diào)幅磁場情況下，電磁力頻率均以原輸入電磁場頻率的兩倍變化，且在調(diào)幅磁場的線性上升段和下降段，電磁力幅值的變化近似為二次拋物線形，在調(diào)幅磁場的恒值段則與連續(xù)施加時一樣。這為合理設(shè)計電磁連鑄時的調(diào)幅磁場打下基礎(chǔ)。
關(guān)鍵字: 調(diào)幅磁場；電磁連鑄；電磁力
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
