Estimation of Electricity Storage Density of Compact SMESs Composed of Si-wafer Stacks Loaded with Superconducting Thin Film Coils in Spiral Trenches under the Constraints of the Critical Magnetic Flux Density
Estimation of Electricity Storage Density of Compact SMESs Composed of Si-wafer Stacks Loaded with Superconducting Thin Film Coils in Spiral Trenches under the Constraints of the Critical Magnetic Flux Density
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临界磁通密度约束下螺旋沟槽中装载超导薄膜线圈的硅片叠层组成的紧凑型SMES的蓄电密度估算
DOI：
10.1088/1742-6596/1590/1/012045
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Honma H
中科院分区：
文献类型：
--
作者：
Motohiro T;Sasaki M;Noh J-H;Takai O;Honma H
对一种由4个20 ~ 1800片硅晶片组成的超导储能系统的储能体积密度W进行了数值估算，并对施加在超导YBa 2Cu 3 O 7-δ薄膜线圈上的磁通密度和电磁环向应力进行了估算.改变槽深、槽宽、槽壁厚、硅片叠片数、螺旋线圈内径等设计参数，在线圈外径为47.45 mm的情况下，在最大磁通密度为B max< 20 T的约束下，获得了最大W为13.6 Wh/l的结果。估计施加到线圈的最大环向应力远低于Si晶片的机械强度极限：4 GPa，这表明如果螺旋沟槽的微制造可行，则可以使用其他衬底材料（例如典型的工程陶瓷）代替Si晶片。
Numerical estimations of electricity storage volume density: W for a proposed compact superconducting magnetic energy storage system composed of 4 stacks of 20 to 1800 Si-wafers loaded with superconducting YBa 2 Cu 3 O 7-δ thin film coils in spiral trenches formed by MEMS process were performed in conjunction with estimations of magnetic flux density and electromagnetic hoop stress applied to the coil. Changing the design parameters such as trench depth, trench width, trench wall thickness, number of stacked Si wafers, the inner-radius of the spiral coil under the fixed outer-radius of 47.45 mm, the maximum W was obtained to be 13.6 Wh/l under the constraint of the maximum magnetic flux density applied to the coil: B max< 20 T. The maximum hoop stress applied to the coil was estimated to be much lower than the mechanical strength limit of the Si wafer: 4 GPa, indicating that other substrate materials such as typical engineering ceramics can be used in place of Si wafer if microfabrication of spiral trenches is feasible.