直流偏磁磁场对硅钢片磁致伸缩特性的影响分析

发布时间：2018-12-19 12:42

【摘要】：直流偏磁条件下电力变压器铁心的振动噪声明显加剧,铁心的磁致伸缩效应是其主要原因之一。目前有关直流偏磁磁场对硅钢片磁致伸缩特性的影响规律尚不完全清楚,亟需从实验测量角度定性地分析其影响规律,为建立有效地减小电力变压器铁心振动噪声的方法提供参考。该文在一台精度为10nm/m的激光位移磁致伸缩测试系统上,对不同直流偏磁磁场下取向硅钢片的磁致伸缩特性进行实验研究,对比分析交变磁化及直流偏磁磁化在磁场饱和前后对磁致伸缩波形形状、峰峰值的影响规律,并将测量结果应用于一台电力变压器铁心的振动位移分析。结果表明:直流偏磁磁场使磁致伸缩回环失去原有的对称性,这种影响会随着磁场饱和程度的增加逐渐减弱;随着偏磁磁场的增加,磁致伸缩峰峰值增大,硅钢片的形变加剧。
[Abstract]:The vibration and noise of the core of power transformer is obviously aggravated under the condition of DC bias, and the magnetostrictive effect of the core is one of the main reasons. At present, the influence of DC magnetic field on magnetostrictive properties of silicon steel sheet is not completely clear, so it is urgent to qualitatively analyze the influence law from the angle of experimental measurement. It provides a reference for effectively reducing the vibration and noise of power transformer core. In this paper, the magnetostrictive properties of silicon steel sheets with different DC bias magnetic fields are experimentally studied in a laser displacement magnetostrictive testing system with precision of 10nm/m. The effects of alternating magnetization and DC bias magnetization on the shape and peak value of magnetostrictive waveform before and after magnetic field saturation are compared and analyzed. The measurement results are applied to the vibration displacement analysis of a power transformer core. The results show that the magnetostrictive return ring loses its original symmetry due to DC bias magnetic field, which will weaken gradually with the increase of magnetic saturation degree, and the peak value of magnetostriction peak increases with the increase of magnetic field bias, and the deformation of silicon steel sheet increases.
【作者单位】：辽宁省现代电工装备理论与共性技术重点实验室(沈阳工业大学);
【基金】：国家自然科学基金资助项目(51277122) 高等学校博士学科点专项科研基金优先发展领域项目(20122102130001) 辽宁省高等学校优秀人才支持计划项目(LJQ2013014) 辽宁省自然科学基金项目(2013020047)~~
【分类号】：TM275

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