结晶器电磁搅拌器端部漏磁的改善分析

Improvement Analysis on Brow Magnetic Leakage of M-EMS

利用数值模拟分析与实验相结合的方法,研究结晶器电磁搅拌器在频率3 Hz,电流为550 A条件下的端部漏磁,并提出了有效改善端部漏磁的磁屏蔽装置。结果表明,在搅拌器中心沿拉速方向上,磁感应强度沿Z轴正向上的变化比较平缓,而向铁芯表面逐渐靠近时,磁感应强度沿Z轴则呈先逐渐增大,在距搅拌器中心平面约150 mm的端部达到最大峰值,然后由端部向外急剧降低的分布趋势。这种磁场分布趋势在越贴近搅拌器铁芯表面处越明显,即端部漏磁越明显。模拟结果与实测结果一致。

Using the raethod of numerical simulation compared with experimental measurement, the brow magnetic leakage of mould electromagnetic stirring system （M-EMS） was studied at the condition of frequency 3 Hz and current 550 A, and a magnetic shielding device to improve the brow magnetic leakage of M-EMS was suggested. The results show that, at the center of EMS along the direction of mold, the changes of the distribution of magnetic flux density is relative flat along the z-axis. While closing to the core of EMS, the distribution of magnetic flux density along the z-axis increases firstly, then sharply decreases after reaching the peak value, the more closing the iron core of EMS, the more clearly the brow leakage of M-EMS. The calculated results conform basically with the experimental data.