Experimental and Numerical Investigation of the Levitation Force Between Bulk Permanent Magnet and ${\rm MgB}_{2}$ Disk

Perini, E.; Giunchi, G.; Geri, Michela; Morandi, Antonio

doi:10.1109/tasc.2009.2019141

Cited by 36 publications

(18 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The axial values are larger than the previous reported measurements of a PM levitating on a MgB 2 disc [4]. The lateral or guidance values are lower than the corresponding stiffness of a cylindrical Halbach PM's assembly inserted into an hollow MgB 2 cylinder [3] where the stiffness was of the order of 110 N/mm but, in that case, a more powerful PM's assembly was used.…”

Section: The Stiffnesscontrasting

confidence: 59%

See 1 more Smart Citation

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

Perini¹,

Bassani²,

Giunchi³

et al. 2010

AIP Conference Proceedings

Self Cite

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

Section: The Stiffnesscontrasting

confidence: 59%

“…The behaviour of the axial levitation forces with the distance z, has been explained in terms of current distribution inside the superconducting MgB 2 , for the simple case of a cylindrical PM levitating on an MgB 2 disc [4].…”

Section: Levitationmentioning

confidence: 99%

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

Perini¹,

Bassani²,

Giunchi³

et al. 2010

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

show abstract

“…An experimental facility for the measurement of the levitation forces between permanent magnets and large superconductor samples has been established at the Laboratory of Magnet Engineering and Applied Superconductivity (LIMSA) of the University of Bologna. The facility, originally developed by EDISON SpA [14]- [15], consists of a vacuum chamber surrounding a copper plate connected to the second stage of a Sumitomo RDK 415D cryocooler. A schematic of the facility is shown in Fig.…”

Section: The Levitation Facilitymentioning

confidence: 99%

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.

View full text Add to dashboard Cite

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.

show abstract

“…However, the going up cycle joins a repulsive force influence and declines the whole attractive levitation force values [26,27]. This case is the cause of smaller going up cycle than going down cycle.…”

Section: Resultsmentioning

confidence: 95%

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Güner

2020

Sakarya University Journal of Science

View full text Add to dashboard Cite

We investigated the microstructure and magnetic properties of Gd123:Gd211 = 1-y : y (y = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) bulk superconductors with the diameter of 13 mm and thickness of 5 mm fabricated by melt-textured method. The vertical levitation force between melt-textured bulk superconductors and a permanent magnet is measured at 30, 40, 50, 60, and 77 K under zero-field-cooling (ZFC) and field-cooling (FC) regimes by Magnetic Levitation Force Measurement System (MLFMS). The phase and microstructures properties of all samples are determined by SEM (Scanning Electron Microscope) and analysed that the pore sizes in the matrix decrease by adding Gd211 particles into Gd123 samples. The measurements of superconducting characteristics showed that the maximum vertical levitation forces of the G1 sample were noted as 3.04, 2.30, 1.53, 0.91 and 0.16 N at the temperatures of 30, 40, 50, 60 and 77 K, respectively. The present results perform that a high-performance good-quality GdBCO can improve from laboratory conditions to technological applications for large scale levitated system.

show abstract

Experimental and Numerical Investigation of the Levitation Force Between Bulk Permanent Magnet and ${\rm MgB}_{2}$ Disk

Cited by 36 publications

References 8 publications

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

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

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

Effect of Gd211 Addition on the Vertical Levitation Force of Gd123 Superconductors

Contact Info

Product

Resources

About