Magnetic levitation of superconducting bars

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

doi:10.1063/1.2201767

Cited by 42 publications

(33 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the functional F SC J; r ½ cannot be considered as simply the energy of the system (SC), because it describes a hysteretic process given by the constraint jJj J c . F SC J; r ½ reduces to the functional introduced by Prigozhin 28,29 and that we have widely used 26,27,30 if the interaction with the FM is not considered; under some conditions 27 this functional is equivalent to the magnetic energy.…”

Section: Modelingmentioning

confidence: 99%

“…a) The model we present will allow the simultaneous calculations of the current profiles in the SC, which is assumed to be in the critical state with constant critical-current density, J c , 23 and the magnetic pole density in the FM that assumes infinite susceptibility and non hysteretic magnetization by minimization of a functional related with the magnetic energy. We introduced similar models based on minimization methods earlier, although the minimization process was only applied to the superconducting part [24][25][26] or the soft magnetic part. 14 This paper is structured as follows.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Shaping magnetic fields with soft ferromagnets: Application to levitation of superconductors

Del-Valle

Agramunt-Puig

Navau

et al. 2012

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Soft ferromagnetic materials have an important role in technology, for increasing magnetic field in specific regions, as in the core of transformers, and for properly modifying the magnetic field in particular shapes. Here we develop a numerical model that allows study of the response of a soft ferromagnet bar with arbitrary cross section and infinite susceptibility when a magnetic field with translational symmetry is applied. This theoretical tool will enable us to analyze the shape and position of the soft ferromagnet to properly modify the magnetic field in the areas of interest. The model can also simulate hybrid systems that contain a superconducting bar as well, considering the mutual interaction between the soft ferromagnetic and the superconducting materials. In particular, we analyze the levitation force of a superconducting bar immersed in the magnetic field created by a guideway of two permanent magnet bars with uniform horizontal magnetization and a soft ferromagnet bar in between. The results show that by placing the soft ferromagnet with an optimized height the levitation force is enhanced.

show abstract

Section: Modelingmentioning

confidence: 99%

mentioning

confidence: 99%

Shaping magnetic fields with soft ferromagnets: Application to levitation of superconductors

Del-Valle

Agramunt-Puig

Navau

et al. 2012

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…͑1͒ in Ref. 15, with the constraints that the net current must be zero and the current density does not exceed the J c . Introducing the J c ͑H i ͒ dependence by means of a first-order iterative algorithm, it is found that, following the notation of Prigozhin, 16 minimizing this functional with the current density J is equivalent to minimizing a functional FЈ with the current density variation ␦J defined as the difference, at present field H, between the present current density J͑r , H͒ and the previous current density Ĵ͑r , H͒ ͑at the first step of H a , Ĵ͑r , H͒ is assumed zero͒.…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…The values of the levitation forces that have been presented are needed complement to the design studies for any superconducting magnetic transportation systems (MAGLEV) [5,6]. The present measurements are preliminary to judge on the future possibility to use MgB 2 bulk superconductors in the transportation sector.…”

Section: Discussionmentioning

confidence: 99%

THE LEVITATION CHARACTERISTICS OF MGB[sub 2] PLATES ON TRACKS OF PERMANENT MAGNETS

Perini¹,

Bassani²,

Giunchi³

et al. 2010

AIP Conference Proceedings

View full text Add to dashboard Cite

The bulk MgB 2 can be manufactured in large plates by an innovative process: the reactive liquid Mg infiltration (Mg-RLI). According to this process it is possible to produce, even at lab scale, plates of 10 ÷ 20 cm in lateral dimensions. The superconducting material resulting is very dense and, even if it is in polycrystalline form, it levitates with respect to Permanent Magnets (PM), like the textured YBCO samples, up to 35 K. In order to control the levitation forces and stiffnesses of an MgB 2 plate (10x10x1 cm 3 ) moving with respect to a track of PM's (NdFeB bars arranged in 4 lines according to an Halbach disposition and separated by Iron flux concentrators), we have used an instrumented Cryogenic Levitation Apparatus (CLA). We have studied different kind of movements of the PM's track with respect to the MgB 2 plate. First, we consider the vertical movement, assumed z direction, which describes the properly levitation characteristics. Secondly, we consider two kinds of lateral movements of the track, assumed x direction, with the long size of the magnets either perpendicular or parallel to the movement direction. The resulting configurations simulate the main movements that a superconducting levitating vehicle will do in a real track, either of axial or of guidance type. The levitation axial forces, measured in Field Cooling or Zero Field Cooling conditions, indicate that at the distance between superconducting plate and PM's of 4 mm it is possible to have an overall levitating pressure of 7 N/cm 2 .

show abstract

Magnetic levitation of superconducting bars

Cited by 42 publications

References 30 publications

Shaping magnetic fields with soft ferromagnets: Application to levitation of superconductors

Shaping magnetic fields with soft ferromagnets: Application to levitation of superconductors

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

THE LEVITATION CHARACTERISTICS OF MGB[sub 2] PLATES ON TRACKS OF PERMANENT MAGNETS

Contact Info

Product

Resources

About