稀土钡铜氧化物闭环超导葫芦形环片堆叠磁体的机械特性分析  

Mechanical Characteristics Analysis of Stacked Magnet of Rare Earth Barium Copper Oxide Closed-Loop Superconducting Gourd-Shaped Loop

作　　者：王婷 王银顺[1] 郭丽宁 卞雨妍 连占英 李乐依 毛承鹏 WANG Ting;WANG Yinshun;GUO Lining;BIAN Yuyan;LIAN Zhanying;LI Leyi;MAO Chengpeng(School of Electrical and Electronic Engineering,North China Electric Power University,Changping District,Beijing 102206,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京市昌平区102206

出　　处：《发电技术》2024年第6期1039-1047,共9页Power Generation Technology

基　　金：国家自然科学基金项目(52377024)。

摘　　要：【目的】高场超导磁体在诸多领域都有着很大的应用价值,但第二代高温超导磁体由于焊接技术尚不成熟,无法实现持续电流模式运行。稀土钡铜氧化物(rare earth barium copper oxide,REBCO)闭环超导葫芦形环片堆叠磁体可实现无阻闭环运行,经验证有磁通密度放大和磁通累加的功能,具有高磁场输出的潜质。因此,研究该磁体在大电流、高磁场运行环境下能否维持稳定很有必要。【方法】通过建立REBCO闭环超导葫芦形环片堆叠磁体的三维有限元模型,分析其在场冷励磁方法下的电磁响应和应力应变分布情况。【结果】堆叠磁体的单位体积电磁力由圆环的内径向外径逐渐减小,两端层数最大单位体积电磁力较高,而中间层数较低,呈现出“U”型分布特征。此外,应力较大的区域出现在磁体的连接桥部位及圆环与桥的连接部分,此区域易发生形变,是潜在的失超风险区域。【结论】磁体的应力应变分布特征分析,对改进葫芦形双孔闭环超导片的几何形状和堆叠磁体的结构具有参考价值,对磁体的安全运行具有重要意义。[Objectives]High-field superconducting magnets have great application value in many fields.Due to the immature welding technology,the second-generation hightemperature superconducting magnets cannot achieve persistent current mode operation.A rare earth barium copper oxide(REBCO)closed-loop superconducting gourd-shaped loop stacked magnet can achieve unimpeded closed-loop operation.It has been verified that it has the functions of flux density amplification and flux accumulation,and has the potential to achieve high magnetic field output.Therefore,it is crucial to study whether this magnet can maintain stability under high current and high magnetic field conditions.[Methods]A three-dimensional finite element model of this REBCO closed-loop superconducting gourd-shaped loop stacked magnet was established to analyze its electromagnetic response and stress-strain distribution under the field cold excitation method.[Results]The electromagnetic force per unit volume of the stacked magnet decreases gradually from the inner diameter to the outer diameter of the circular loop,with higher values at both ends and lower values in the middle,it presented a“U”shaped distribution.Additionally,the areas with significant stress are located at the connecting bridge and the junction between the loop and the bridge,making these regions prone to deformation and potential quench risks.[Conclusions]The analysis of the distribution characteristics of stress and strain of the magnet has a reference significance for improving the geometric shape of the gourd-shaped double-hole closed-loop superconducting sheet and the structure of the stacked magnet,and is of great significance to the safe operation of the magnet.

关 键 词：核聚变 高温超导磁体 超导储能 稀土钡铜氧化物(REBCO) 堆叠磁体 

分 类 号：TK01[动力工程及工程热物理] TL62[核科学技术—核技术及应用]