Stability model of bulk HTS field pole of a synchronous rotating machine under load conditions
Stability model of bulk HTS field pole of a synchronous rotating machine under load conditions
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DOI：
10.1088/1361-6668/abda5b
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发表时间：
2021-02
影响因子：
3.6
通讯作者：
M. Watasaki;M. Izumi;M. Miki;C. Bocquel;E. Shaanika;K. Yamaguchi;T. Ida;S. Englebretson;R. Chin;M. Morita;H. Teshima
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作者：
M. Watasaki;M. Izumi;M. Miki;C. Bocquel;E. Shaanika;K. Yamaguchi;T. Ida;S. Englebretson;R. Chin;M. Morita;H. Teshima
高温超导(HTS)块体作为具有捕获磁通的磁体，潜在地表现出高于永磁体的高磁场性能。在第四次工业革命中，高温超导磁体可能会促进用于推进的高效和轻型电机和发电机的开发。为了评估和验证高温超导旋转机械的耐久性，我们开发了一种径向间隙型旋转机械，其场极模块由高温超导块材组成。在机器运行期间，我们检查了磁极捕获磁通的稳定性。旋转机械在不同的负载下运行，分析了与高温超导块体捕获磁通相关的磁场。分析了不同负荷和转速下的运行情况，并考察了恒定负荷下的长期运行情况。观察到体磁极俘获磁通和输出功率在360h以上基本恒定，高温超导块体磁体的表面温度在40K以下几乎没有变化。此外，通过负载测试前后的磁通量测量确定的磁通衰减小于1%。对高温超导块体周围磁场分布的分析表明，横向磁通流经转子铁心的磁导。这些结果表明，通过适当的三维定位高温超导块体积累的场极模块的高俘获磁通在同步电机中具有潜在的应用前景。
High-temperature superconducting (HTS) bulks act as magnets with trapped magnetic flux and potentially exhibit high magnetic field performance, superior to that of permanent magnets. In the fourth industrial revolution, HTS magnets could potentially facilitate the development of highly efficient and lightweight motors and generators for propulsion. To evaluate and verify the durability of HTS rotating machines, we developed a radial-gap-type rotating machine whose field-pole modules comprised HTS bulks. We examined the stability of the trapped magnetic flux of the field poles during the machine’s operation. The rotating machine was operated with different loads, and the magnetic field associated with the trapped flux of the HTS bulks was analyzed. The analysis was performed for different loads and revolution speeds, and the long-term operation for a constant load was investigated. The trapped flux of the bulk field poles and the output power were observed to be almost constant for over 360 h, and the HTS bulk magnet’s surface temperature hardly changed below 40 K during the machine’s operation. Furthermore, the magnetic flux decay determined from magnetic flux measurements before and after a load test was less than 1%. An analysis of the magnetic field distribution around the HTS bulk revealed that the transverse magnetic flux flowed through the magnetic guide of the rotor core. These results indicate the potential synchronous machine application of the high trapped magnetic flux of the field-pole modules accumulated by the appropriate positioning the HTS bulks three-dimensionally.