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首页> 外文期刊>ISIJ international >Comments on 'Improvement of in-mold electromagnetic stirrer by feeding of magnetic system with polyharmonic current'
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Comments on 'Improvement of in-mold electromagnetic stirrer by feeding of magnetic system with polyharmonic current'

机译：关于“通过多谐波电流馈送磁性系统改善模内电磁搅拌器”的评论

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摘要

In an article published in this journal, A. F. Kolesnichenko et al. argued that the dual-coil EMS application should produce the so-called edge effect which would consequently lead to parametric resonance of the mold meniscus. Therefore, according to the authors, dual-coil EMS is not adequate to provide the required meniscus stability. The premise of the edge effect is central to the consideration of the dual-coil EMS performance given in the article. According to the hypothesis of the edge effect, a portion of the primary magnetic field produced by the inductors of dual-coil EMS is rejected due to interaction with currents induced in the mold rather than being transmitted through the mold wall. This portion of the magnetic field, as shown in Fig. 3 of the article, travels outside of the mold toward its upper end, where it circumvents the upper edge of the mold wall and enters the melt meniscus from above. In the melt, just below the meniscus, magnetic flux interacts with radial component of the induced currents resulting in the oscillating Lorentz force. As comparatively low frequency magnetic fields are used in the EMS systems (typically f < 10 Hz), parametric resonance should occur at the meniscus when the frequency of magnetic field is close to or coincides with the eigenfrequency of a free oscillation mode on the meniscus.
机译：在该杂志发表的一篇文章中，A。F. Kolesnichenko等人。认为双线圈EMS应用应产生所谓的边缘效应，从而导致模具弯月面的参数共振。因此，根据作者的说法，双线圈EMS不足以提供所需的弯月面稳定性。边缘效应的前提对于本文中考虑的双线圈EMS性能至关重要。根据边缘效应的假设，双线圈EMS感应器产生的一部分初级磁场会由于与模具中感应的电流相互作用而被拒绝，而不是通过模具壁传输。如图3所示，这部分磁场朝着模具的上端行进到模具的外部，在那里它绕过模具壁的上边缘，并从上方进入熔融弯液面。在弯液面正下方的熔体中，磁通量与感应电流的径向分量相互作用，从而产生振荡的洛伦兹力。由于在EMS系统中使用了相对较低的磁场（通常f <10 Hz），因此当磁场的频率接近或与弯月面上的自由振荡模式的本征频率一致时，应在弯月面上发生参数共振。

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  • 来源
    《ISIJ international》 |2005年第1期|p.142-144|共3页
  • 作者

    L. BEITELMAN;

  • 作者单位

    ABB Inc., 1450 Hopkins Street, Suite 203, Whitby, Ontario LIN 2C3, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 黑色金属材料;
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