Reduction of Mechanical Losses Due to Frictional Heat in Bi-2223 Tapes Using Structural Materials of Various Thermal Expansion Properties

Takao, T.; Masuda, Tomoaki; Sakabe, R.; Nishimura, Kohei; Goto, Takayuki; Fukui, Satoshi; Yamanaka, Akihiro; Nishimura, A.

doi:10.1109/tasc.2010.2041338

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…DFRP expands at low temperature, and the windings are fixed tightly. As a result, the mechanical loss owing to the vibration of the winding can be small [3], [4]. However, the processing of DFRP is more difficult than the one of glass fiber reinforced plastic (GFRP) or the one of stainless steel (SUS).…”

Section: Introductionmentioning

confidence: 99%

Influence of Mechanical Vibration and Losses Under AC Operating in Bi-2223 Tapes With Ionic Liquid Impregnation

Nakamura

Oka

Takagi

et al. 2012

IEEE Trans. Appl. Supercond.

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Mechanical loss in superconducting coils is one of the important parameters for the stability of high temperature superconducting coils (HTS coil). We prepared three kinds of impregnations (no impregnation, ionic liquid grease), measured the AC loss of the Bi-2223 tape under DC magnetic field in liquid nitrogen and quantitatively estimated the relation between the impregnation and losses. As a result, the loss can be reduced about 40% by using ionic liquid compared with no impregnation.We consider that the tape impregnated with ionic liquid is effective to reduce the AC loss. The results become fundamental data to reduce the AC loss of conduction-cooled HTS coils.

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Section: Introductionmentioning

confidence: 99%

Influence of Mechanical Vibration and Losses Under AC Operating in Bi-2223 Tapes With Ionic Liquid Impregnation

Nakamura

Oka

Takagi

et al. 2012

IEEE Trans. Appl. Supercond.

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“…Our approach to reduce the mechanical loss is to use the thermal expansion/contraction properties of a bobbin material in the coils [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Loss and Bobbin Materials in AC Superconducting Coil Under AC Magnetic Field

Takao

Masuda

Nishimura

et al. 2011

IEEE Trans. Appl. Supercond.

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We made small superconducting coils and measured the total AC loss under the AC and DC external magnetic fields. The coil winding conditions are that 1, 5, and 10 N of the winding tensions and bobbin materials are glass fiber reinforced plastic (GFRP) and Dyneema fiber reinforced plastic (DFRP). The GFRP and the DFRP have thermal strain properties of contraction and expansion respectively with cooldown to cryogenic temperature. Mechanical losses were estimated from the measured data. According to the estimated mechanical losses, the loss of the coil whose bobbin material is the DFRP was small because the DFRP bobbin expanded and hence the winding was tightly fixed. Approximate 10 to 13% of the AC loss can be reduced by only changing the bobbin material from the GFRP to the DFRP.

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Mechanical Loss and Bobbin Material in Double Pancake AC Superconducting Coils

Takao

Nishimura

Sakai

et al. 2013

IEEE Trans. Appl. Supercond.

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Reduction of Mechanical Losses Due to Frictional Heat in Bi-2223 Tapes Using Structural Materials of Various Thermal Expansion Properties

Cited by 5 publications

References 8 publications

Influence of Mechanical Vibration and Losses Under AC Operating in Bi-2223 Tapes With Ionic Liquid Impregnation

Influence of Mechanical Vibration and Losses Under AC Operating in Bi-2223 Tapes With Ionic Liquid Impregnation

Mechanical Loss and Bobbin Materials in AC Superconducting Coil Under AC Magnetic Field

Mechanical Loss and Bobbin Material in Double Pancake AC Superconducting Coils

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