AC loss measurement of HTS coils with ferromagnetic disks

Furuse, Mitsuho; Kondoh, Junji; Tanaka, Hideki; Umeda, M.

doi:10.1109/tasc.2003.813068

Cited by 29 publications

(27 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The HTS coil comprises 10 double pancake coils wound by the Bi2223/Ag tape whose specification is also listed in Table I. The HTS coils have been manufactured for the research of the LC resonance type fault current limiter developed by the National Institute of Advanced Industrial Science and Technology [1], [2]. Coil A is wound with the single Bi2223/Ag tape without the winding tension but impregnated with epoxy resin.…”

Section: A Specifications Of Hts Coilmentioning

confidence: 99%

“…The mechanical losses are mainly caused by the frictional vibration and the nonlinear deformation of the coil winding. In another collaboration, the mechanical losses produced in the HTS coil have been studied [1], [2]. The main objective of this study is to investigate the electromagnetic AC loss characteristics of a solenoid HTS Manuscript coil consisting of pancake coils.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of AC Loss Characteristics of High Temperature Superconducting Coil

Fukui

Tonsho

Toyoda

et al. 2005

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: A Specifications Of Hts Coilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of AC Loss Characteristics of High Temperature Superconducting Coil

Fukui

Tonsho

Toyoda

et al. 2005

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Generally, magnetization losses are dominant among the total losses of HTS coils, and the total AC losses of coils can be estimated from the magnetic field distribution and the measured magnetization losses of short samples by applying perpendicular and parallel magnetic fields to the tape surface [1].…”

Section: Introductionmentioning

confidence: 99%

“…To demonstrate this method, the authors measured the total losses of HTS coils wound with Bi2223 silver sheathed tape superconductors and having a volume of 1 L, inductance of 170 mH, and average critical current of 16.7 A (defined by 1 ), with and without attached ferromagnetic disks [1]. The total losses measured by the boil-off method were 10 to 100 times greater than that forecast from the magnetization losses of short samples.…”

Section: Introductionmentioning

confidence: 99%

“…The total losses measured by the boil-off method were 10 to 100 times greater than that forecast from the magnetization losses of short samples. This is evidently because of mechanical loss from the inelastic deformation of a coil due to an electromagnetic force associated with the generated magnetic field, which may been dominant in the total loss [1]. The total loss could be reduced Manuscript by half by epoxy impregnation, but was still much greater than the magnetization loss.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on AC Loss Reduction of HTS Coils by Use of Ferromagnetic Disks

Furuse

Tanaka

Kondoh

et al. 2004

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

Manufacturing techniques suitable for fabricating low AC loss high-temperature superconductor (HTS) coils are necessary to realize high-efficiency power equipment. Usually, the AC magnetization loss of HTS tape conductors is anisotropically dependent on the magnetic field, with a magnetic field perpendicular to the tape surface degrading HTS coil performance. Therefore, decreasing the magnetic field perpendicular to the tape surface is an efficient method of reducing the total AC loss of HTS coils. In a previous study, the possibility of AC loss reduction through the use of ferromagnetic materials was shown numerically, and the total AC loss of HTS coils with and without attached ferromagnetic disks was measured. However, no obvious differences in AC loss was observed because the total AC loss was dominated by mechanical loss. In this study, a low mechanical loss, 30 A, 90 mH HTS coil is fabricated by winding with stainless-steel tape and employing epoxy impregnation. A clear reduction in AC loss is then observed by attaching the ferromagnetic disks.

show abstract