Developing Highly efficient HTS AC windings for fully superconducting machines

为全超导机器开发高效高温超导交流绕组

• 批准号: EP/P002277/1
• 负责人: Min Zhang
• 金额: $ 12.86万
• 依托单位: University of Bath
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FP002277%2F1
• 关键词: Developing; Highly; efficient; HTS; AC

Superconductors have zero resistivity below their critical temperatures, enabling them to carry large amounts of current. Therefore, superconductors can be used to construct powerful electrical machines with light and compact designs. However, one key difficulty when designing superconducting machines is that superconductors dissipate heat when they carry AC current or in AC magnetic fields. This heat dissipation (AC loss) in a low temperature environment adds to the cost and difficulties of keeping the superconductors at low operational temperature. The AC loss reduces system efficiency because up to a hundred times the cooling power in room temperature is required to remove it. In order to increase the machine efficiency it is therefore vital to be able to accurately estimate how much AC loss is dissipated in a superconducting machine and to identify strategies to reduce this loss.Significant progress has been made towards understanding the AC loss of superconductors in research laboratories worldwide. However, estimating the AC loss of superconductors in electrical machines is an intrinsically difficult task. There is a complicated interaction between the current and the magnetic field inside an electrical machine and the influence of this interaction on the machine AC loss is unknown at this moment. Actions, both experimentally and numerically, are required to understand the AC loss of superconducting machines.The aim of this project is to develop new experimental and numerical tools to estimate the AC loss of superconducting machines. We will design an experiment to measure the AC loss of superconductors in a simulated electrical machine environment. We will also develop a new FEM model, which will be validated by experimental data, to efficiently estimate the AC loss of fully superconducting machines. Furthermore, we will use the model to identify new strategies to reduce the AC loss and improve the efficiency of fully superconducting machines, based on the latest HTS technologies.

超导体的电阻率低于其临界温度，使其能够携带大量电流。因此，超导体可用于构建具有光线和紧凑设计的强大电机。但是，在设计超导型机器时，一个关键的困难是，超导体在携带AC电流或交流磁场中散发热量。在低温环境中，这种散热（AC损失）增加了将超导体保持在低操作温度的成本和困难。交流损耗降低了系统效率，因为需要室温下的冷却功率高达一百倍。因此，为了提高机器效率，至关重要的是，能够准确估计超导机器中的AC损失量消失了多少，并确定降低这种损失的策略。在了解全球研究实验室中AC超导体的交流损失方面已取得了重大进展。但是，估计电机中超导体的交流损失是本质上困难的任务。电机内部的电流和磁场之间存在复杂的相互作用，目前尚不清楚这种相互作用对机器AC损耗的影响。在实验和数字上，都需要采取行动才能了解超导机器的交流损失。该项目的目的是开发新的实验和数值工具，以估计超导机器的交流损失。我们将设计一个实验，以测量模拟电机环境中超导体的交流损失。我们还将开发一个新的FEM模型，该模型将通过实验数据验证，以有效估计完全超导机器的交流损失。此外，我们将使用该模型来确定基于最新的HTS技术的新策略来减少AC损失并提高完全超导机器的效率。

项目成果

Multifilament HTS Cables to Reduce AC Loss: Proof-of-Concept Experiments and Simulation

• DOI: 10.1109/tasc.2023.3265436
• 发表时间: 2023
• 期刊: IEEE Transactions on Applied Superconductivity
• 影响因子: 1.8
• 作者: Tian Lan;Hengpei Liao;M. Iftikhar;W. Yuan;Alexandre Cole;Reda Abdouh;Min Zhang

An effective way to reduce AC loss of second-generation high temperature superconductors

• DOI: 10.1088/1361-6668/aaee05
• 发表时间: 2018-11
• 期刊: Superconductor Science and Technology
• 影响因子: 3.6
• 作者: Mingyang Wang;Min Zhang;Meng Song;Zhuyong Li;Fangliang Dong;Z. Hong;Zhijian Jin

Fully superconducting machine for electric aircraft propulsion: study of AC loss for HTS stator

• DOI: 10.1088/1361-6668/ab9687
• 发表时间: 2019-12
• 期刊: Superconductor Science and Technology
• 影响因子: 3.6
• 作者: Fangjing Weng;Min Zhang;Tian Lan;Yawei Wang;W. Yuan

Non-uniform ramping losses and thermal optimization with turn-to-turn resistivity grading in a (RE)Ba2Cu3Ox magnet consisting of multiple no-insulation pancake coils

• DOI: 10.1063/1.4997738
• 发表时间: 2017-08
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: Yawei Wang;Min Zhang;W. Yuan;Z. Hong;Zhijian Jin;Honghai Song

A new ring-shape high-temperature superconducting trapped-field magnet

• DOI: 10.1088/1361-6668/aa7a51
• 发表时间: 2017-08
• 期刊: Superconductor Science and Technology
• 影响因子: 3.6
• 作者: J. Sheng;Min Zhang;Yawei Wang;Xiaojian Li;Jay Patel;W. Yuan