New technique for the measurement of the intrinsic drag torques of high temperature superconductor bearings

Chew, A. D.; Chambers, A.; Troup, A. P.

doi:10.1016/0964-1807(95)00075-5

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…The low magnetic drag of an HTS bearing has suggested its use as a sensitive detector of gas pressure [141]. The possibility of using low-loss superconducting bearings in sensitive gyroscopes has long been recognized [4].…”

Section: Applicationsmentioning

confidence: 99%

“…A completely different phenomenon that also affects an HTS bearing is the need for a larger breakaway torque at startup than is required to keep the bearing rotating at constant speed [141]. This phenomenon, which is believed to be due to the azimuthal inhomogeneity of the PM, is analogous to the difference between static and dynamic friction in mechanical systems.…”

Section: Bearing Dynamicsmentioning

confidence: 99%

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Superconducting bearings

Hull

2000

Supercond. Sci. Technol.

469

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: Applicationsmentioning

confidence: 99%

Section: Bearing Dynamicsmentioning

confidence: 99%

Superconducting bearings

Hull

2000

Supercond. Sci. Technol.

469

203

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“…HTS bearings are characterized by very low drag torque. This, together with stiffness and damping against perturbations from equilibrium have led to investigations of their use in flywheel energy systems [2]- [6], a lunar telescope [7], sensitive gravimeters [8], and as a sensitive detector of gas pressure [9]. Here we present a design for a cosmic microwave background (CMB) radiation polarimeter that is based on levitating a rotating half wave plate by means of an HTS bearing.…”

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confidence: 99%

A cosmic microwave background radiation polarimeter using superconducting bearings

Hanany

Matsumura

Johnson

et al. 2003

IEEE Trans. Appl. Supercond.

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Abstract-Measurements of the polarization of the cosmic microwave background (CMB) radiation are expected to significantly increase our understanding of the early universe. We present a design for a CMB polarimeter in which a cryogenically cooled half wave plate rotates by means of a high-temperature superconducting (HTS) bearing. The design is optimized for implementation in MAXIPOL, a balloon-borne CMB polarimeter. A prototype bearing, consisting of commercially available ringshaped permanent magnet and an array of YBCO bulk HTS material, has been constructed. We measured the coefficient of friction as a function of several parameters including temperature between 15 and 80 K, rotation frequency between 0.3 and 3.5 Hz, levitation distance between 6 and 10 mm, and ambient pressure between 10 −7 and 1 torr. The low rotational drag of the HTS bearing allows rotations for long periods of time with minimal input power and negligible wear and tear thus making this technology suitable for a future satellite mission.

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Levitation Applications of High-Temperature Superconductors

Hull

2004

High Temperature Superconductivity 2

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New technique for the measurement of the intrinsic drag torques of high temperature superconductor bearings

Cited by 6 publications

References 14 publications

Superconducting bearings

Superconducting bearings

A cosmic microwave background radiation polarimeter using superconducting bearings

Levitation Applications of High-Temperature Superconductors

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