TY - JOUR
T1 - Magnetization Loss Characteristics of a GdBCO Tape in kHz Frequency Band
AU - Inoue, Ryota
AU - Miyagi, Daisuke
AU - Tsuda, Makoto
AU - Matsuki, H. Idetoshi
N1 - Funding Information:
Manuscript received September 19, 2017; accepted March 20, 2018. Date of publication March 29, 2018; date of current version April 17, 2018. This work was supported by JSPS KAKENHI under Grant JP17J02242. (Corresponding author: Ryota Inoue.) The authors are with the Department of Electrical Engineering, Graduate School, Tohoku University, Sendai 980-8579, Japan (e-mail:, ryota. [email protected]).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2018/6
Y1 - 2018/6
N2 - We have investigated the application of a high-temperature superconducting (HTS) coil to a high-power wireless power transmission system operated in the frequency region less than 10 kHz. In order to reduce the ac loss of the HTS coil, it is necessary to clarify the characteristics of magnetization loss in the HTS tape with a copper layer in the kHz frequency band. Therefore, we prepared GdBCO tapes with and without the copper layer and measured the magnetization loss of the GdBCO tape exposed to a vertical magnetic field in the kHz frequency band. We analyzed the ac losses of the GdBCO layer, the copper layer, and the other layers within the tape by a finite element method analysis. The influence of the copper layer thickness on the ac loss in each layer was investigated by a finite element method (FEM) analysis. The magnetization loss per cycle of the GdBCO tape slightly decreased with the frequency. The magnetization loss, however, can be approximately estimated by Brandt's formula with a certain accuracy when the n value of the tape is large. In the GdBCO tape with the copper layer, when the external magnetic field was large, the magnetization loss per cycle of the GdBCO layer was larger than the copper layer loss. The magnetization loss, however, decreased and the copper layer loss increased with the thickness of the copper layer. The total loss of the GdBCO tape can be reduced by placing the coppers layer near the GdBCO layer.
AB - We have investigated the application of a high-temperature superconducting (HTS) coil to a high-power wireless power transmission system operated in the frequency region less than 10 kHz. In order to reduce the ac loss of the HTS coil, it is necessary to clarify the characteristics of magnetization loss in the HTS tape with a copper layer in the kHz frequency band. Therefore, we prepared GdBCO tapes with and without the copper layer and measured the magnetization loss of the GdBCO tape exposed to a vertical magnetic field in the kHz frequency band. We analyzed the ac losses of the GdBCO layer, the copper layer, and the other layers within the tape by a finite element method analysis. The influence of the copper layer thickness on the ac loss in each layer was investigated by a finite element method (FEM) analysis. The magnetization loss per cycle of the GdBCO tape slightly decreased with the frequency. The magnetization loss, however, can be approximately estimated by Brandt's formula with a certain accuracy when the n value of the tape is large. In the GdBCO tape with the copper layer, when the external magnetic field was large, the magnetization loss per cycle of the GdBCO layer was larger than the copper layer loss. The magnetization loss, however, decreased and the copper layer loss increased with the thickness of the copper layer. The total loss of the GdBCO tape can be reduced by placing the coppers layer near the GdBCO layer.
KW - AC loss
KW - eddy current loss
KW - HTS coil
KW - kHz frequency band
KW - magnetization loss
KW - wireless power transmission
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U2 - 10.1109/TASC.2018.2820734
DO - 10.1109/TASC.2018.2820734
M3 - Article
AN - SCOPUS:85044734258
SN - 1051-8223
VL - 28
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 4
M1 - 8201405
ER -