Theoretical and experimental study on AC loss in HTS tape in AC magnetic field carrying AC transport current

Kojima

Ogawa

et al. 2006

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Numerical studies on AC loss characteristic of a assembled conductors of multiple HTS tapes with high aspect ratio simulating YBCO tape in polygonal arrangement were presented in this paper. We developed a numerical model to analyze the AC loss in the HTS tape in the polygonally assembled conductor based on our previously developed model. The relations between the geometrical configuration and the AC loss properties of the conductor were made clear by the numerical simulation. The numerical results give the important information for the design of the cable conductor assembled by the HTS tapes with high aspect ratio such as YBCO tapes.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of AC Loss Characteristics of Cable Conductor Assembled by HTS Tapes in Polygonal Arrangement

Kojima

Ogawa

et al. 2006

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“…The total AC loss in the tape is calculated by the numerical model described in the next section. [3], [4] Since the AC self and external magnetic fields electromagnetically couple the superconducting filaments in the tape, it is 1051-8223/$20.00 © 2005 IEEE TABLE I SPECIFICATIONS OF HTS COIL AND TAPE reasonable to model the filamentary region of the tape as a mixture of superconductor and normal metal in this analysis [5]. The transport current flows in the direction of the tape axis and the external AC magnetic field is applied perpendicular to the tape axis.…”

Section: Methodsmentioning

confidence: 99%

“…The AC losses of the tape in the AC coil are caused by this AC transport current and external AC magnetic field. In our previous study [5], a method to approximately estimate the electromagnetic AC loss in the HTS coil based on the numerical model of the AC loss in HTS tapes [3], [4] has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of AC Loss Characteristics of High Temperature Superconducting Coil

Tonsho

Toyoda

et al. 2005

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This paper reports an analytical study on AC loss characteristics of a high temperature superconducting coil wound with a Bi2223/Ag tape. The electromagnetic AC loss in the high temperature superconducting coil made by stacking pancake coils wound with the Bi2223/Ag tape was numerically calculated by using the measured DC data of the HTS tape. The calculated AC loss was compared with measured AC losses in Bi2223 HTS coils obtained in a previous study. It had been found that the measured AC losses in the coils contained large mechanical loss. For the comparison of the measured and calculated losses, the mechanical loss was subtracted from the measured total loss data to estimate the electromagnetic loss. The calculated AC losses were compared with the measured electromagnetic losses in the coils, producing rather good agreement. A possible way to reduce the AC loss in the HTS coil was also presented and discussed.

“…Therefore, to establish the optimal design of the winding structure of the HTS coil is considered to be effective for the design of the AC power apparatuses. In our previous study [1]- [5], we have proposed a method to approximately estimate the AC loss in the HTS coil by the summation of the total AC loss in the HTS tape over the coil cross section. It has been shown that the experimental AC loss characteristics of the HTS coils wound by the Bi2223/Ag [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on AC Loss Reduction of Multi-Pole HTS Coil by Optimal Design of Winding Cross Section of Element Coil

Takahashi

Ogawa

et al. 2010

We study the optimal design of 2-and 4-pole coils wound by YBCO tapes as the case studies of the optimal design of the multiple-coil system based on the AC loss minimization. The winding cross sections of the element coils of the 2-and 4-pole coils were optimized starting from the conventional rectangular cross section to minimize the AC loss. The result shows that the AC loss in the optimized coil is significantly reduced and the critical current of the optimized coil is increased compared with the base coil. According to the results, the validity of our optimal design method is verified to effectively reduce the AC loss in the multi-pole coils wound by the YBCO tapes. Some disadvantageous points of the optimized coil are also discussed.