(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: 建立軟接觸電磁連鑄過程電磁場計(jì)算模型，通過分別采用瞬態(tài)分析和諧波分析對高頻正弦磁場計(jì)算結(jié)果的比較，驗(yàn)證高頻磁場瞬態(tài)分析的準(zhǔn)確性。利用瞬態(tài)分析方法，研究高頻正弦激勵(lì)電流密度在結(jié)晶器內(nèi)鋼液中產(chǎn)生的磁感應(yīng)強(qiáng)度、感應(yīng)電流及電磁力的變化規(guī)律。結(jié)果表明：鋼液中磁感應(yīng)強(qiáng)度和感應(yīng)電流隨激勵(lì)電流密度的變化，其變化頻率與激勵(lì)電流密度的變化頻率相同，但由于結(jié)晶器壁有較強(qiáng)感應(yīng)電流，鋼液中磁感應(yīng)強(qiáng)度和感應(yīng)電流與激勵(lì)電流密度的變化并非同步，說明電磁連鑄結(jié)晶器內(nèi)的高頻磁場并非簡諧波磁場；電磁力的變化頻率是激勵(lì)電流密度變化頻率的兩倍，激勵(lì)電流密度達(dá)到正負(fù)幅值時(shí)，電磁力達(dá)到最大值，但當(dāng)激勵(lì)電流密度為零時(shí)，電磁力不為零，且部分電磁力會(huì)反向，嚴(yán)重時(shí)會(huì)導(dǎo)致液面波動(dòng)，應(yīng)加以控制。
關(guān)鍵字: 電磁連鑄；高頻磁場；瞬態(tài)分析；非簡諧磁場
（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
