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轴对称高场超导磁体电磁应力有限元分析方法
张红洁1王秋良2刘宏伟3,4刘建东1李伟1
0
(1. 北京石油化工学院,北京 102617; 2. 中国科学院电工研究所,应用超导重点实验室,北京 100190;3. 华北电力大学,新能源电力系统国家重点实验室,北京 102206; 4. 高电压技术与电磁兼容北京市重点实验室,北京 102206)
摘要:
核磁共振成像和核磁共振谱仪是高场超导磁体的主要应用领域。高场超导磁体通常具有较高的磁场和运行电流,在运行过程中超导线会产生较高的电磁应力,其临界特性将发生退化,影响磁体的稳定性。开展高场超导磁体的电磁应力精确分析显得尤为必要。本文发展了一种快速有效的有限元分析方法,第一步,为整个超导磁体系统建立平均有限元模型,采用传统的电磁-结构耦合方法求解电磁应力,获得最大应力位置;第二步,对最大应力所在的超导线圈建立详细有限元模型,采用单积分-结构分析方法精确求解每一组分中电磁应力。基于该模型研究了500 MHz NMR超导磁体的电磁应力。该分析方法也可以用于超导磁体冷却过程中的热应力分析。为高场超导磁体设计和建造提供有益的理论依据。
关键词:  高场超导磁体;详细有限元模型;电磁应力  核磁共振谱仪
DOI:
基金项目:?北京市优秀人才培养资助项目(批准号:2012D005005000006)、北京市教育委员会科技计划(批准号: KM201310017005)、北京市高等学校青年英才计划项目(批准号: YETP1483)资助的课题.
Finite Element Analysis Method for ElectromagneticStress of Axisymmetric High Field SuperconductingMagnet
Hongjie ZHANG1 Qiuliang WANG2 Hongwei LIU3,4 Jiandong LIU1 Wei Li1
(1. Beijing Institute of Petrochemical Technology, Beijing 102617, China 2. Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Science, Beijing 100190, China 3. State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China 4. Key Laboratory of HV and EMC, Beijing 102206, China)
Abstract:
Nuclear magnetic resonance Spectrometer and nuclear magnetic resonance imaging are the main applications of high field superconducting magnets. Because the high-field superconducting magnets usually have a high magnetic field and operating current, the superconducting wire will withstand higher electromagnetic stress during the operation. So that the critical characteristics of wire will be degraded, the stability of the magnet affected. It is necessary to carry out the precise analysis of the electromagnetic stress of the high field superconducting magnet. In this paper, a fast and effective finite element analysis method is developed. The first step is to establish the average finite element model for the whole superconducting magnet system. The traditional electromagnetic-structural coupling method is used to solve the electromagnetic stress and obtain the maximum stress position. In the second step, a detailed finite element model is established for the superconducting coil where the maximum stress is located. The single integral - structure analysis method is used to accurately solve the electromagnetic stress in each component. Based on this model, the electromagnetic stress of 500 MHz NMR superconducting magnet was studied. The analytical method can also be used for thermal stress analysis of superconducting magnets during cooling. Which can provide useful theoretical suggestions for the design and construction of high field superconducting magnets.
Key words:  high-field superconducting magnet  the detailed finite element model  electromagnetic stress  NMR

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