Numerical Evaluation of AC Loss in High Temperature Superconducting Coil

Tonsho, Hiroyuki; Toyoda, M.; Fukui, Satoshi; Yamaguchi, M.; Satô, Takao; Furuse, Mitsuho; Tanaka, Hisashi; Arai, K.; Umeda, M.

doi:10.1109/tasc.2004.830027

Cited by 23 publications

(18 citation statements)

References 5 publications

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“…Based on the single tape analysis, it was found that the simulation of the superconducting coil cross section modeling each individual filament making a tape is not practical, so a multiscale approach was used as proposed in [24], [23], [28]. Hence, the magnetic field at the coil boundary is split into a DC component and magnetic ripples using Fast Fourier Transform (FFT).…”

Section: -Methodology For Estimating the Hysteretic Losses In A Supmentioning

confidence: 99%

Estimation of hysteretic losses for MgB₂tapes under the operating conditions of a generator

Vargas-Llanos

Zermeño

Sanz

et al. 2016

Supercond. Sci. Technol.

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Hysteretic losses in MgB 2 wound superconducting coils of a 500 kW synchronous hybrid generator were estimated as part of the European project SUPRAPOWER led by the Spanish company Tecnalia Research and Innovation. Particular interest was given to the losses found in tapes in the superconducting rotor caused by the magnetic flux ripples originating from the conventional stator during nominal operation. To compute the losses, a 2D Finite Element Method was applied to solve the H-formulation of Maxwell's equations considering the nonlinear properties of both the superconducting material and its surrounding Ni matrix. To be able to model all the different turns composing the winding of the superconducting rotor coils, three geometrical models of single tape cross section of decreasing complexity were studied: 1) the first model reproduced closely the actual cross section obtained from micrographs, 2) the second model was obtained from the computed elastoplastic deformation of a round Ni wire, 3) the last model was based on a simplified elliptic cross section. The last geometry allowed validating the modeling technique by comparing numerical losses with results from well-established analytical expressions. Additionally, the following cases of filament transpositions were studied: no, partial and full transposition. Finally, choosing the right level of geometrical details to predict the expected behavior of individual superconducting tapes in the rotor, the following operational regimes were studied: Bias-DC current, ramping current under ramping background field, and magnetic flux ripples under DC background current and field.

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Section: -Methodology For Estimating the Hysteretic Losses In A Supmentioning

confidence: 99%

Estimation of hysteretic losses for MgB₂tapes under the operating conditions of a generator

Vargas-Llanos

Zermeño

Sanz

et al. 2016

Supercond. Sci. Technol.

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“…Outline of Calculation Procedure [5] The HTS tape in the winding of the AC coil operated under AC condition carries the AC transport current in the AC magnetic field produced by the coil itself. The total AC loss in the HTS tape in the winding of the coil depends on the magnetic field and the field angle.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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Analysis of AC Loss Characteristics of High Temperature Superconducting Coil

Fukui

Tonsho

Toyoda

et al. 2005

IEEE Trans. Appl. Supercond.

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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.

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“…It has been shown that the experimental AC loss characteristics of the HTS coils wound by the Bi2223/Ag [4]. From these previous works [3]- [5], we have obtained an idea that the AC loss in the HTS coil can be minimized by optimizing the winding cross section. In [6], an optimizing method of the winding cross section of the HTS coil based on the AC loss minimization has been proposed and the method has been applied to design the cross section of HTS coils which comprise several double pancake coils wound by the Bi2223 tape as a case study to show the effectiveness of AC loss reduction of single coil.…”

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

Fukui

Takahashi

Ogawa

et al. 2010

IEEE Trans. Appl. Supercond.

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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.

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Numerical Evaluation of AC Loss in High Temperature Superconducting Coil

Cited by 23 publications

References 5 publications

Estimation of hysteretic losses for MgB₂tapes under the operating conditions of a generator

Estimation of hysteretic losses for MgB₂tapes under the operating conditions of a generator

Analysis of AC Loss Characteristics of High Temperature Superconducting Coil

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

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Numerical Evaluation of AC Loss in High Temperature Superconducting Coil

Cited by 23 publications

References 5 publications

Estimation of hysteretic losses for MgB2tapes under the operating conditions of a generator

Estimation of hysteretic losses for MgB2tapes under the operating conditions of a generator

Analysis of AC Loss Characteristics of High Temperature Superconducting Coil

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

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Estimation of hysteretic losses for MgB₂tapes under the operating conditions of a generator

Estimation of hysteretic losses for MgB₂tapes under the operating conditions of a generator