Practical adaptation in bulk superconducting magnetic bearing applications

McMichael, C.K.; B., K.; Lamb, Mark; Lin, Ming‐Wei; Chow, L. E.; Meng, R. L.; Hor, P. H.; Chu, W. K.

doi:10.1063/1.107145

Cited by 42 publications

(11 citation statements)

References 11 publications

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“…Three of these augmentation methods are shown in figure 7. Figure 7(a) shows augmentation in the form of an Evershed-type design [61,112,113]. Here, the levitated rotor consists of a levitation PM, below which hangs a rigid rod with a smaller stabilizing PM on the bottom.…”

Section: Bearing Designsmentioning

confidence: 99%

“…The remainder of the weight is provided by the interaction between the stabilizing PM and the HTS; this interaction also supplies sufficient stiffness for vertical stability and some additional radial stability. Figure 7(b) shows augmentation in which a stator PM is placed below the HTS and acts in repulsion with the levitated PM [113]. Here, the PM/PM interaction is vertically stable but horizontally unstable.…”

Section: Bearing Designsmentioning

confidence: 99%

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Superconducting bearings

Hull

2000

Supercond. Sci. Technol.

466

203

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The physics and technology of superconducting bearings is reviewed. Particular attention is given to the use of high-temperature superconductors (HTSs) in rotating bearings. The basic phenomenology of levitational forces is presented, followed by a brief discussion of the theoretical models that can be used for conceptual understanding and calculations. The merits of various HTS bearing designs are presented, and the behaviour of HTS bearings in typical situations is discussed. The article concludes with a brief survey of various proposed applications for HTS bearings.

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Section: Bearing Designsmentioning

confidence: 99%

Section: Bearing Designsmentioning

confidence: 99%

Superconducting bearings

Hull

2000

Supercond. Sci. Technol.

466

203

View full text Add to dashboard Cite

show abstract

“…has significant potential for a number of high-field engineering applications such as fly-wheel energy storage, 1-3 magnetic bearings, [4][5][6][7][8][9] superconducting motors, and bulk magnets. has significant potential for a number of high-field engineering applications such as fly-wheel energy storage, 1-3 magnetic bearings, [4][5][6][7][8][9] superconducting motors, and bulk magnets.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of large Nd–Ba–Cu–O grains prepared under low oxygen pressure

Babu

Cardwell

et al. 2000

J. Mater. Res.

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A large, single-grain Nd-Ba-Cu-O (NdBCO) composite consisting of superconducting NdBa 2 Cu 3 O 7−␦ containing nonsuperconducting Nd 4 Ba 2 Cu 2 O 10 phase inclusions was fabricated up to 2 cm in diameter using a top-seeded melt-textured growth technique. A MgO single-crystal seed was used to provide a heterogeneous nucleation site at the center of a presintered pellet heated above its peritectic temperature and cooled continuously in a conventional tube furnace in reduced oxygen partial pressure. This process produces individual grains with the c axis oriented at ≈10°to the seed surface which, from vibrating-sample magnetization measurements, exhibit a pronounced peak effect in their magnetic moment over a wide temperature range (50-90 K) when the supercurrent flows in the a-b planes. A very high irreversibility field (>9 T at 77 K) is also observed in these grains for field applied both perpendicular and parallel to the crystallographic c axis which is significantly greater than that observed in good-quality melt-processed Y-Ba-Cu-O. These results underline the potential of NdBCO for high-field engineering applications.

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“…In this regards, superconducting bulks have been used extensively in practice as a replacement for rare-earth permanent magnet [3]. However, regardless of practical cHallenges due to mechanical instability in high field imposed by Lorentz forces and low current density comparable the size of a bulk [4], [5], the crossed magnetic field has a destructive effect on the magnetization of superconducting bulks [6]. On the other hand, applying AC magnetic field on superconducting bulks would redistribute the initial current distribution inside the superconductor which leads to reduction of the main initial trapped field.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Baghdadi

Fagnard

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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This paper investigates the practical effectiveness of employing superconducting stacked tapes to superconducting electric machinery. The use of superconducting bulks in various practical applications has been addressed extensively in the literature. However, in practice, dramatic demagnetization of magnetic moments would occur on superconducting bulks due to the crossed field effect. In our study, we employed the superconducting stacked tapes in a synchronous superconducting motor, which was designed and fabricated in our laboratory, aiming to lessen demagnetization due to crossed field effect in comparison with superconducting bulks. Applying the transverse AC field, the effects of frequency, amplitude, and number of cycles of the transverse magnetic field are discussed. Furthermore, a stack of 16 layers of superconducting tapes is modelled and the consequences of applying the crossed magnetic field on the sample are evaluated. The confrontation between experiments and simulation allows us to thoroughly understand the crossed field effects on stacked tapes. At the end, a preventive treatment, based on the shielding characteristic of superconductor and materials with high permeability, i.e. mu metal and metalic glass, is suggested. On the other hand, the shielding feature of aforementioned materials will hinder the penetration of magnetic field and, consequently, reduction of the demagnetization will be attained.

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Practical adaptation in bulk superconducting magnetic bearing applications

Abstract: Articles you may be interested inThe structure and spin dynamics of lanthanidebearing silicate glasses

Cited by 42 publications

References 11 publications

Superconducting bearings

Superconducting bearings

Fabrication and characterization of large Nd–Ba–Cu–O grains prepared under low oxygen pressure

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

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