TY - JOUR
T1 - Influence of Copper Rings and Plates on Eddy Losses of No-Insulation High Temperature Superconductor Coil in Synchronous Machines
AU - Fu, Yutong
AU - Wang, Yawei
AU - Yang, Qingqing
AU - Xue, Wenbo
AU - Lu, Zhen
AU - Hong, Zhiyong
AU - Jin, Zhijian
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - No-insulation (NI) high temperature superconducting (HTS) machine is a semi-superconducting machine with improved thermal-stability and power density, in which the rotor windings are replaced with NI HTS coils. However, the AC background field from stator windings leads to significant eddy current in NI HTS windings. The induced eddy current and loss affect the operating efficiency and safety of HTS machine. Traditionally, copper discs and rings are used for conduction cooling and mechanical support of NI HTS coil. In this paper, the influence of copper discs and rings on reducing the eddy current and loss of double pancake NI HTS coil is studied. Three structures of copper discs, copper ring, and both copper discs and ring are analyzed, by both simulation and experiment. The results show that all these three structures of copper shielding can effectively reduce the eddy loss on NI HTS coil within the HTS machine operating temperature of 20-30 K. The combination of copper discs and ring has the best shielding performance.
AB - No-insulation (NI) high temperature superconducting (HTS) machine is a semi-superconducting machine with improved thermal-stability and power density, in which the rotor windings are replaced with NI HTS coils. However, the AC background field from stator windings leads to significant eddy current in NI HTS windings. The induced eddy current and loss affect the operating efficiency and safety of HTS machine. Traditionally, copper discs and rings are used for conduction cooling and mechanical support of NI HTS coil. In this paper, the influence of copper discs and rings on reducing the eddy current and loss of double pancake NI HTS coil is studied. Three structures of copper discs, copper ring, and both copper discs and ring are analyzed, by both simulation and experiment. The results show that all these three structures of copper shielding can effectively reduce the eddy loss on NI HTS coil within the HTS machine operating temperature of 20-30 K. The combination of copper discs and ring has the best shielding performance.
KW - Eddy current and loss
KW - Superconducting machine
KW - electromagnetic shielding
KW - no-insulation coil
KW - ripple magnetic field
UR - http://www.scopus.com/inward/record.url?scp=85128609518&partnerID=8YFLogxK
U2 - 10.1109/TASC.2022.3168531
DO - 10.1109/TASC.2022.3168531
M3 - Article
AN - SCOPUS:85128609518
SN - 1051-8223
VL - 32
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 6
M1 - 5202007
ER -