Applications of high temperature superconductors on levitation bearings and other levitation devices

Chu, W. K.; Ma, K.B.; McMichael, C.K.; Lamb, Mark

doi:10.1016/0964-1807(93)90434-4

Cited by 51 publications

(14 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bulk Y-Ba-Cu-O (YBCO) is widely accepted as a very promising high-temperature superconductor (HTS) for a number of high-field and -current applications, such as magnetic bearings, fault current limiters and flywheel energy storage systems [1][2][3][4]. The potential of YBCO derives from its ability to pin magnetic flux at liquid nitrogen temperatures (77 K) in the presence of an applied field of typically up to 5 T (i.e.…”

Section: Introductionmentioning

confidence: 99%

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Smith

Cardwell

Babu

et al. 2000

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Y-Ba-Cu-O (YBCO) precursor powder composed primarily of YBa 2 Cu 3 O 7−δ (Y-123) and Y 2 BaCuO 5 (Y-211) containing 0.1 w/w% Pt has been prepared by the evaporative decomposition of solution (EDS) and subsequent calcination for the fabrication of bulk melt-processed ceramics. The decomposition process in the as-produced powder and the formation of the Y-123 and Y-211 phases have been studied in detail using differential thermal analysis and powder x-ray diffractometry. The morphology, microstructure and particle size distribution of the powder has been investigated using scanning electron microscopy, transmission electron microscopy and particle size analysis, and the powder has been found to contain a significant proportion of sub-micrometre-sized particles. Samples fabricated by seeded melt growth using the EDS-prepared powder have been observed to exhibit a finer distribution of the Y-211 phase than is typically obtained in similar samples prepared via a mixed oxide route. This provides direct evidence of the suitability of EDS precursor powder for the fabrication of large-grain, high-J c melt-processed YBCO monoliths.

show abstract

Section: Introductionmentioning

confidence: 99%

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Smith

Cardwell

Babu

et al. 2000

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Several researchers [8]- [12] have studied different superconducting materials, and their critical temperature limit and speed transmission characteristics, but mainly focused on direct current induction heaters, maglev trains, and wires [7]- [10]. [13]- [14] discovered a superconducting material at room temperature, a carbon hydride, and sulfur, Tc = 287.7 ± 1.2 K (about 15 • C), but under a pressure of 267 ± 10 GPa (close to the pressure at the center of the Earth).…”

Section: Backgroung and Historymentioning

confidence: 99%

Torque Characteristics Analysis of a Novel Hybrid Superconducting Magnetic Coupling With Axial-Flux Using a Magnetic Equivalent Circuit Model

et al. 2022

View full text Add to dashboard Cite

A novel hybrid superconducting coupling (NHSC) is proposed in this paper, in which the secondary is composed of copper and a split superconductor. A magnetic equivalent circuit (MEC) model is presented to analyze and calculate the distribution of the magnetic field and torque characteristics. The 3D modeling considers the end effects encountered in mating. The expressions of the magnetic flux and torque are obtained by combining Kirchhoff's law and Ampere's loop law, respectively. A 3D finite element (FE) model is built, and the simulation is performed. Its performance is investigated using a 135K critical hightemperature superconductor to have a greater operating margin of the coupling. For a high slip speed of 1500 rpm, we observed a peak torque of 167 Nm and stability of 115 Nm. By varying the thickness of the air gap or the PMs, we observed the increasing or decreasing of the torque. Due to the cryogenics systems, we also observed the reduction of the losses by the joule effect. The maximum error between the results of the torque obtained by simulation and the results calculated using the proposed model is 6.74%, which proves that both results are in good agreement.INDEX TERMS Hybrid superconducting magnetic coupling, magnetic equivalent circuit (MEC), split superconductor disk, torque.

show abstract

“…When they are processed in bar shapes, they also form the critical parts of fault current limiters and current leads (Chu et al, 1993;Coombs et al, 1998;Imagawa et al, 1997). When they are processed in bar shapes, they also form the critical parts of fault current limiters and current leads (Chu et al, 1993;Coombs et al, 1998;Imagawa et al, 1997).…”

Section: Processing Of Rebco By Melt Texturingmentioning

confidence: 99%

Superconductor Permanent Magnets for Advanced Propulsion Applications

Putman

Saláma

et al. 2005

AIP Conference Proceedings

View full text Add to dashboard Cite

Measuring the interaction force between a high temperature superconductor and a permanent magnet Am.Abstract. Improved trapped fields of 17 T at 29 K and 11.2 T at 47 K have been reported for the melt-textured YBCO superconductor material. Such high field strengths give the possibility for producing superconductor permanent magnets (SCPM) for plasma-related space propulsion applications, such as the anti-matter trap, magnetohydrodynamic (MHD) propulsion and electrical power generation, and others that are under development or being studied. The SCPM could be beneficial in reducing the weight-to-power ratio for the associated delivery and containment systems needed for plasma interactions that are inherently imbedded in many of these propulsion systems. In this paper, a review of the superconductor literature is presented, followed by uses of the SCPM in high-performance space propulsion applications.

show abstract

Applications of high temperature superconductors on levitation bearings and other levitation devices

Cited by 51 publications

References 3 publications

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Torque Characteristics Analysis of a Novel Hybrid Superconducting Magnetic Coupling With Axial-Flux Using a Magnetic Equivalent Circuit Model

Superconductor Permanent Magnets for Advanced Propulsion Applications

Contact Info

Product

Resources

About