(1. 上海大學(xué) 材料科學(xué)與工程學(xué)院，上海 200072；
2. 江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212013)
摘 要: 利用軟接觸電磁連鑄過程電磁場計算模型，對方波和正弦波調(diào)幅磁場進(jìn)行瞬態(tài)分析，研究調(diào)幅激勵電流密度與結(jié)晶器內(nèi)金屬液中的磁感應(yīng)強(qiáng)度和電磁力之間的響應(yīng)關(guān)系。結(jié)果表明：磁感應(yīng)強(qiáng)度幅值與激勵電流密度幅值呈正比關(guān)系，兩者隨時間變化規(guī)律一致；調(diào)幅磁場磁感應(yīng)強(qiáng)度變化頻率與高頻激勵電流密度的頻率一致，且磁感應(yīng)強(qiáng)度幅值和磁感應(yīng)強(qiáng)度變化頻率都與調(diào)幅波的頻率無關(guān)，這是通過電流密度調(diào)幅獲得調(diào)幅磁場的依據(jù)；調(diào)幅磁場電磁力與調(diào)幅磁場磁感應(yīng)強(qiáng)度的平方成正比，與調(diào)幅電流密度的平方成正比，電磁力幅值變化周期與調(diào)幅電流密度幅值變化周期一致，電磁力變化頻率是高頻激勵電流密度變化頻率的兩倍。這給調(diào)幅磁場通過控制激勵電流密度來控制電磁力提供了依據(jù)。
關(guān)鍵字: 電磁連鑄；高頻調(diào)幅磁場；瞬態(tài)分析；磁感應(yīng)強(qiáng)度；電磁力
（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 calculation model of electromagnetic field in soft contact electromagnetic continuous casting process was developed and a transient analysis on electromagnetic field amplitude-modulated with sine wave and square wave was carried out. The responsive relation of magnetic induction density (B) and electromagnetic force (Fem) to exciting current density of amplitude-modulate magnetic field (AMMF) was investigated via the model. The results show that the amplitude of magnetic induction density (Bm) is in direct proportion to the amplitude of exciting current density (Jm). The frequency of B is consistent with that of exciting current density. Both Bm and frequency of B are independent of the frequency of modulating wave. The results are theoretical basis of AMMF induced by modulating the exciting current density. The value of Fem is in direct proportion to the square of magnetic induction density as well as the square of the exciting current density. The variation cycle of amplitude of Fem is consistent with that of Jm. The frequency of Fem is doubled that of exciting current density. The results are bases for controlling Fem by adjusting exciting current density.
Key words: electromagnetic continuous casting; high frequency amplitude-modulated electromagnetic field; transient analysis; magnetic induction density; electromagnetic force
