Temperature dependence of levitation force and its relaxation in a HTS levitation system

Zhou, Jùn; Zhang, Xingyi; Zhou, Youhe

doi:10.1016/j.physc.2009.12.070

Cited by 22 publications

(13 citation statements)

References 16 publications

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“…5. A similar trend is reported in [21]. This effect is due to the fact that at high critical current density corresponding to low temperature, the maximum possible magnetic moment is induced by the PM in the SC bulk (see section V.A).…”

Section: B Zero Field Coolingsupporting

confidence: 82%

“…However, by decreasing the temperature the phenomena becomes less evident and the profile of force measured during the subsequent descending and ascending runs become closer. All the phenomenology outlined in this section with reference to the ZFC case, as well as the one discussed in the next section for the FC case, is widely reported in the literature [10], [13], [21], [22]. Same phenomenology also applies for different SC materials, like MgB2 [14], [23].…”

Section: B Zero Field Coolingmentioning

confidence: 86%

“…The bounded power law is used for modelling the superconductor, i.e. the following expression is assumed for relating the magnitudes of vectors J and E [21]- [27]: (2) where rNS is the resistivity of the material in the normal state.…”

Section: A Numerical Modelmentioning

confidence: 99%

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The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

Morandi

Fabbri

Ribani

et al. 2018

IEEE Trans. Appl. Supercond.

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The levitation force between a single grain YBCO cylindrical bulk superconductor and a permanent magnet is investigated. The force measured both in zero field cooling and field cooling condition in the temperature range 20 K-80 K is reported. The dependence of peak levitation force and power dissipation on the temperature is analyzed and the saturation of the peak force with increasing the critical current of the material is pointed out. A numerical analysis is also carried out for understanding the electrodynamics of the levitation mechanism. Good reproduction of the measured data is obtained and relevant observed phenomena, such as hysteresis of the levitation cycle at high temperature and saturation of the peak force at low temperature, are explained by means of the model. Characterization of the material in terms of critical current density in the field range 0 T-0.5 T is also obtained by means of the numerical model by means of the fitting of the measured data.

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Section: B Zero Field Coolingsupporting

confidence: 82%

Section: B Zero Field Coolingmentioning

confidence: 86%

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The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

Morandi

Fabbri

Ribani

et al. 2018

IEEE Trans. Appl. Supercond.

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“…The toroid presents a largely unshielded dark surface to thermal radiation. But below about 60 K the levitation force becomes limited by the field profile of the magnet [21], [22]. So even if J c increases, colder temperatures do not significantly affect the results.…”

Section: Discussionmentioning

confidence: 92%

Stiffness Enhancement of a Superconducting Magnetic Bearing Using Shaped YBCO Bulks

Storey

Szmigiel

Robinson

et al. 2020

IEEE Trans. Appl. Supercond.

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“…In all the cases, the force is hysteretic because of the hysteresis in magnetization [5,[14][15][16]. The hysteresis behaviour also depends on several factors like the fabrication method [17,18], volume and geometry of both, superconductor and magnet, the relative velocity between magnet and superconductor, type of magnet [19] and the configuration of the HTS-PM system [20,21]. Several approximations have been proposed to explain this type of interactions, like frozen-image method [22][23][24], also different analytical and numerical solutions have been studied using the critical state model for some particular configurations [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Attraction and repulsion forces in melt-textured and sintered YBCO-superconductors: a comparative study

Arias-Arana

Rojas-Zambrano

Mariño-Camargo

2020

redin

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In this paper, we measure the attraction (suspension) and repulsion (levitation) forces produced by the interaction between a permanent magnet and different bulk superconductors. The measurements of the interaction force HTS-PM were carried out with a relatively simple technique developed by us, which is reproducible, reliable and low cost. The obtained results were analyzed with the Bean’s critical-state model assuming a uniform magnetic field applied to the superconductor. Two superconducting samples of YBa2Cu3O7-δ (YBCO) prepared by solid-state reaction method and by the melt-textured growth method (MTG) were used. Both samples presented a different hysteresis behaviour in the field cooling (FC) and zero field cooling (ZFC) regimes. Levitation and suspension phenomena were observed in the MTG sample; however, the sintered sample (S) with Oxygen deficiencies (δ > 0.15) displayed a slight levitation force but did not show a suspension force, the latter one attributed to a more efficient magnetic flux pinning. Additionally, the critical current density of both samples was determined from the maximum gap of the force (ΔF) in the FC regime. The obtained values were between 43.00 A/cm2 and 2,758 A/cm2 for the sintered and MTG samples, respectively. These values show a remarkable difference between sintered and MTG samples like that observed from magnetization measurements, which indicate that attraction and repulsion force measurements could provide a rapid and reliable characterization method of polycrystalline superconducting samples.

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Temperature dependence of levitation force and its relaxation in a HTS levitation system

Cited by 22 publications

References 16 publications

The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

The Measurement and Modeling of the Levitation Force Between Single-Grain YBCO Bulk Superconductors and Permanent Magnets

Stiffness Enhancement of a Superconducting Magnetic Bearing Using Shaped YBCO Bulks

Attraction and repulsion forces in melt-textured and sintered YBCO-superconductors: a comparative study

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