Study on Optimal Design of High Temperature Superconducting Coil Based on AC Loss Minimization

Fukui, Satoshi; Ohsugi, K.; Nishijyo, T.; Ogawa, J.; Oka, Tetsuo; Yamaguchi, M.; Satô, Takao; Furuse, Mitsuho; Takao, T.; Tsukamoto, O.

doi:10.1109/tasc.2008.920823

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Most of these have dealt with the shape and position of the coil itself [8], while others have employed flux shields around the coils [9]. If the HTS coils in the HTS winding are allowed to carry different currents, i.e.…”

Section: Experiments and Resultsmentioning

confidence: 99%

High temperature superconductor machine prototype

Mijatović

Jensen

Traholt

et al. 2011

2011 International Conference on Electrical Machines and Systems

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A versatile testing platform for a High Temperature Superconductor (HTS) machine has been constructed. The stationary HTS field winding can carry up to 10 coils and it is operated at a temperature of 77K. The rotating armature is at room temperature.Test results and performance for the HTS field winding comprising four coils wound with two types of HTS tapes are shown and discussed. The field winding produces up to 0.62T in the 10mm air gap which constitutes 78% of the armature design value. Recommendations for the field winding operation are proposed and verified, which resulted in an increase of available magneto-motive force of the field winding up to 25%.

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Section: Experiments and Resultsmentioning

confidence: 99%

High temperature superconductor machine prototype

Mijatović

Jensen

Traholt

et al. 2011

2011 International Conference on Electrical Machines and Systems

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“…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. This case study has shown the validity of the drastic AC loss reduction of the HTS coil [6].…”

Section: Introductionmentioning

confidence: 99%

“…In the study presented in [6], we have not investigated for the multi-coils system. In this study, expanding our previous work, we successively apply our optimization method to the design of multiple-coil system wound by the YBCO tapes.…”

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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“…Under AC mode of operation, the situation becomes more complicated as mechanisms for AC loss generation, such as flux creep, dynamic resistance and flux hysteresis, play important roles [2]. While some studies continue to use loss data obtained for short wire sample to calculate AC losses in coils [3,4] and to optimize the geometry of coils and minimize AC losses [5], other recent work has shown [6] that HTS wires behavior in stacks is different from that of free wires. There is only limited number of experimental research of AC losses in HTS coils confined by single [7][8][9][10][11][12] and double [13] pancakes.…”

mentioning

confidence: 99%

AC losses in HTS multi-pancake coils made of BSCCO-tape

Friedman¹,

Yeoshua²,

Faina³

et al. 2010

J. Phys.: Conf. Ser.

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Abstract. We present measurements of AC losses in Bi-2223 multi-pancakes coils with different geometries. Measurements were performed at 77 K at frequencies ranging from 50 to 1600 Hz. The losses are found to depend strongly on coil configuration and linearly increase with increasing frequency. The centre pancakes in the coils exhibit larger AC losses than pancakes situated at the ends. Also, AC losses within pancakes depend on adjacent pancakes, even if kept in an open circuit state. The strong change of inductances of pancakes in multipancakes coils was observed in opposite to negligible change for single pancake. Introducing a gap between pancakes/ double pancakes can be used as a means of decreasing AC losses in multi-pancakes HTS coils. IntroductionPower devices based on high temperature superconductors (HTS) are expected to be incorporated in future power applications. The issue of AC losses in coils made of HTS is, therefore, of current interest. Characteristics of HTS coils carrying DC current can be calculated on the basis of known wire properties by integrating voltage on each segment of the wire in the coil depending on the value and direction of local magnetic field [1]. Under AC mode of operation, the situation becomes more complicated as mechanisms for AC loss generation, such as flux creep, dynamic resistance and flux hysteresis, play important roles [2]. While some studies continue to use loss data obtained for short wire sample to calculate AC losses in coils [3,4] and to optimize the geometry of coils and minimize AC losses [5], other recent work has shown [6] that HTS wires behavior in stacks is different from that of free wires. There is only limited number of experimental research of AC losses in HTS coils confined by single [7][8][9][10][11][12] and double [13] pancakes. Results of these works show only that problem of losses in multi-turn HTS coils is complicated [7]. It is the goal of this paper to experimentally study the AC loss in HTS pancakes forming a coil. We present a detailed study of AC losses of single pancakes, double pancakes and multi-pancake coils with different geometry containing several double pancakes. The measurements were carried out at current much below critical current of the coils at frequencies from 20 Hz to 1600 Hz. We present new results of the distribution of the AC losses inside coils that surprisingly show that AC losses are significantly higher in central pancakes than in edge pancakes.

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Study on Optimal Design of High Temperature Superconducting Coil Based on AC Loss Minimization

Cited by 5 publications

References 9 publications

High temperature superconductor machine prototype

High temperature superconductor machine prototype

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

AC losses in HTS multi-pancake coils made of BSCCO-tape

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