(1. 上海大学 材料科学与工程学院，上海 200072；
2. 江苏大学 材料科学与工程学院，镇江 212013)
摘 要: 建立软接触电磁连铸过程电磁场计算模型，通过分别采用瞬态分析和谐波分析对高频正弦磁场计算结果的比较，验证高频磁场瞬态分析的准确性。利用瞬态分析方法，研究高频正弦激励电流密度在结晶器内钢液中产生的磁感应强度、感应电流及电磁力的变化规律。结果表明：钢液中磁感应强度和感应电流随激励电流密度的变化，其变化频率与激励电流密度的变化频率相同，但由于结晶器壁有较强感应电流，钢液中磁感应强度和感应电流与激励电流密度的变化并非同步，说明电磁连铸结晶器内的高频磁场并非简谐波磁场；电磁力的变化频率是激励电流密度变化频率的两倍，激励电流密度达到正负幅值时，电磁力达到最大值，但当激励电流密度为零时，电磁力不为零，且部分电磁力会反向，严重时会导致液面波动，应加以控制。
关键字: 电磁连铸；高频磁场；瞬态分析；非简谐磁场
（1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China）
Abstract: A computation model of magnetic field in electromagnetic soft contact continuous casting process was developed. The credibility of transient analysis result of high frequency electromagnetic field via model was verified by comparing transient analysis result with harmonic analysis result. The rule of magnetic induction density, induced eddy current and electromagnetic force varied with high frequency sine exciting current was investigated. The results reveal that the magnetic induction density and induced eddy current vary at the same frequency as exciting current. The electromagnetic force varies at double frequency of exciting current. When the exciting current reaches the amplitude value, the electromagnetic force is close to the maximal value, whereas when the exciting current is zero, the electromagnetic force is not zero. At the same time, only partial electromagnetic force reverses its direction. If the reversed electromagnetic force is expanded seriously, the fluctuation of liquid level is induced, which must be controlled.
Key words: electromagnetic continuous casting; high frequency electromagnetic field; transient analysis; nonharmonic magnetic field
