Experimental study of magnetization AC loss in MgB2 wires and cables with non-magnetic sheath

Kováč, J.; Šouc, J; Kòváč, Pavol; Hušek, I; Gömöry, Fedor

doi:10.1016/j.physc.2013.09.011

Cited by 18 publications

(22 citation statements)

References 19 publications

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“…E.g. in [24], the ac losses in a mono-filament and a 30-filament wire were compared and coupling losses showed a clear dominance in the 30-filament wire, whereas the losses in the mono-filament wire were purely hysteretic.…”

Section: Resultsmentioning

confidence: 99%

Coupling currents and hysteresis losses in MgB₂superconductors

Magnusson¹,

Lindau²,

Taxt³

et al. 2014

Supercond. Sci. Technol.

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MgB 2 multi-filamentary superconductors are widely considered for use in dc applications. To expand the possible application range to ac apparatuses, the development of a low ac loss wire is needed. This development involves several steps, and a solid understanding of the loss mechanisms is important to optimize that process as well as for evaluating dc wires exposed to current or magnetic field ripple. In this study we discuss the coupling currents and their influence on hysteresis loss as well as on coupling current loss. We give a phenomenological explanation of the origin and behaviour of the coupling currents and describe the loss patterns for hysteresis loss and coupling current loss separately. Finally, we interpret measured AC losses in an MgB 2 wire cut into different lengths representing different twist pitches. Under certain circumstances short sample lengths are shown to give inaccurate measurement results. On the other hand, short sample lengths of non-twisted wires can be used to estimate the twist pitch necessary to electromagnetically decouple the superconducting filaments.

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Section: Resultsmentioning

confidence: 99%

Coupling currents and hysteresis losses in MgB₂superconductors

Magnusson¹,

Lindau²,

Taxt³

et al. 2014

Supercond. Sci. Technol.

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“…In addition, the superconductor may lose superconductivity and current carrying capability if suffering from excess AC loss. Reducing AC losses can cut down cooling cost considerably for practical application [6], [7]. Therefore, it is worthwhile to study and understand AC losses behavior in superconductors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Test and Analysis of AC Losses in Multifilamentary MgB₂ Wire

Pei

Sheng

et al. 2019

IEEE Trans. Appl. Supercond.

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AC losses in superconductors are essential for the design of cooling system for large scale power applications. Magnesium diboride (MgB2) superconducting wires have been investigated and manufactured over the last decade due to cheap raw materials and flexibility for coil design. In addition, multifilamentary MgB2 wires have been manufactured to reduce AC losses. In this paper, self-field AC losses of multifilamentary MgB2 wires with magnetic barrier were investigated using both experimental and numerical methods. A short straight wire sample and a coil sample were tested under various temperatures and frequencies between 16 Hz and 128 Hz. The test results show that the transportation loss is independent of the operating temperature. On basis of both theoretical and numerical study, it is found that hysteresis loss in superconductor accounts only for a small fraction of the transportation losses, ferromagnetic hysteresis loss in the magnetic barrier dominates when the transport current is low, whereas eddy current loss dominates when the transport current is close to the critical current.

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“…The AC loss in MgB 2 wires with nonmagnetic sheath and variable architecture has been analyzed [9]. Decoupling effect in twisted wires and transposed cables [10] and AC losses of high current density MgB 2 wires made by IMD process have been also presented [11]. Magnusson et.al. have shown the coupling current and hysteresis losses in Ti sheathed MgB 2 superconductors and described the coupling currents by phenomenological approach [12].…”

Section: Introductionmentioning

confidence: 99%

“…MgB 2 superconductors are considered recently also for direct drive wind turbine generators [7][8], where the losses generated by AC magnetic fields must be removed by the cooling system and has to be considered in the design of efficient and secure generator [8]. Recently, several contributions on AC losses in MgB 2 have been presented [9][10][11]. The AC loss in MgB 2 wires with nonmagnetic sheath and variable architecture has been analyzed [9].…”

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confidence: 99%