Enhanced stability by field cooling in superconducting levitation with translational symmetry

Valle, N.; Sanchez, Alvaro; Pardo, Enric; Navau, Carles; Chen, Du-Xing

doi:10.1063/1.2785169

Cited by 43 publications

(33 citation statements)

References 22 publications

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“…The SC is cooled at zero applied field but with the magnetic field of the PMs. We assume that during the cooling process, no currents are induced in the SC, 14 that is, the PMs do not induce current penetration inside the SC but modify the value of J c .…”

Section: Tunability Of the Critical-current Density In Superconductormentioning

confidence: 99%

Tunability of the critical-current density in superconductor-ferromagnet hybrids

Del-Valle

Navau

Sanchez

et al. 2011

Applied Physics Letters

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Important modifications on the magnetization loops of the superconductor have been observed in superconductor-ferromagnet hybrids due to the effects of the ferromagnetic components, which can be used for tuning the superconductor critical-current density Jc to desirable values. Here, a model based on an energy minimization procedure is presented to analyze the complex interaction between the superconductor and the ferromagnets. We show how the geometry and orientation of the ferromagnets can be chosen for shifting the position of the peaks appearing in the magnetization to positive or negative applied fields, and, consequently, to tune Jc in superconductor-ferromagnet hybrids.

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Section: Tunability Of the Critical-current Density In Superconductormentioning

confidence: 99%

Tunability of the critical-current density in superconductor-ferromagnet hybrids

Del-Valle

Navau

Sanchez

et al. 2011

Applied Physics Letters

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“…And for the HTSC/PMG system, the hysteresis of the magnetic force is caused by the change of the induced currents in the HTSC bulk. Based on Maxwell's equation the induced current is related to the magnetic field difference between the applied field and the trapped magnetic field in the HTSC bulk [13]. From this point of view, we might think that the essential factor causing the energy loss here is the change of the trapped magnetic field during lateral displacement [10].…”

Section: Resultsmentioning

confidence: 99%

Influence of Maglev Force Relaxation on Hysteresis of Bulk HTSC Above the NdFeB Guideway at Different Lateral Displacements

Qin

Shu

2010

J Supercond Nov Magn

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After the maglev force (both levitation and guidance forces) relaxation property of a high-temperature superconductor (HTS) above a permanent-magnet guideway (PMG) was studied experimentally, the HTS bulk was horizontally moved in the lateral direction with different displacements above the permanent-magnet guideway. Both levitation and guidance force curves with lateral displacement were obtained by a SCML-2 measurement system synchronously. It was found that the levitation force hysteresis after relaxation was reduced compared to the case without relaxation, while the guidance force hysteresis curve almost did not change. This study provided a scientific analysis for the practical application of the bulk HTS.

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“…Zheng and Yang [4] studied the stable condition between cylindrical HTS and rectangular PM. Del-Valle et al [5][6][7] theoretically analyzed the levitation force of a system consisting of an infinitely long superconductor over an infinitely long PMG using a realistic model, and gave the physical keys for reduction of the levitation force after lateral movement. Song et al [2] studied the levitation capability of the HTS Maglev above PMG during the lateral movements and found that LF reduces but GF keeps constant.…”

Section: Introductionmentioning

confidence: 99%

Characteristic of the Guidance Force in the High-T c Superconducting Levitation System with Pre-Load Process

Lin

Deng

et al. 2009

J Supercond Nov Magn

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The stable levitation above permanent magnet is an important characteristic of the bulk high-T c superconductor (HTS). When an external force pushes the bulk HTS up, down or sideways, or tries to tilt it, a restoring force can return it to its initial position. The HTS Maglev relied on this characteristic can overcome the external force from wind or pass the curve lines successfully. The change of guidance force (GF) during many times lateral movement is studied. Experiments show that GF increases during the lateral movement, no matter what kind of PMG or HTS is used, and the change of the GF slows down after 5 times lateral movement. The pre-load method can reduce the levitation force decay during lateral movement. So the influence of GF by the pre-load method is needed to be studied. It is found that the pre-load method can increase GF and reduce the change of the GF during lateral movement. The Halbach permanent magnetic guideway (PMG) can offer much more GF but the change is larger just as the levitation force decays. The GF of cylindrical bulk HTS increases more than of the rectangular bulk HTS in the pre-load case. The characteristics of the GF during the lateral movement are explained. These results are important for further HTS Maglev vehicle system designs.

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Enhanced stability by field cooling in superconducting levitation with translational symmetry

Cited by 43 publications

References 22 publications

Tunability of the critical-current density in superconductor-ferromagnet hybrids

Tunability of the critical-current density in superconductor-ferromagnet hybrids

Influence of Maglev Force Relaxation on Hysteresis of Bulk HTSC Above the NdFeB Guideway at Different Lateral Displacements

Characteristic of the Guidance Force in the High-T c Superconducting Levitation System with Pre-Load Process

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