Application of high temperature superconductors on levitation bearings, torque transmissions and vibration dampers

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

doi:10.1109/77.233726

Cited by 17 publications

(3 citation statements)

References 7 publications

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“…After the relative velocities have disappeared at a small separation distance, the vehicles would experience an attractive force if their distances tended to separate. Hysteresis is also important in the potential use of HTS as torque couplers and vibration dampers [165]. Apparently, the first successful vacuum tunnelling experiment, which eventually led to the development of the scanning tunnelling microscope, was made possible by suppression of vibrations with the use of a superconducting bearing [166].…”

Section: Applicationsmentioning

confidence: 99%

Superconducting bearings

Hull

2000

Supercond. Sci. Technol.

466

224

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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%

Superconducting bearings

Hull

2000

Supercond. Sci. Technol.

466

224

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“…The use of HTS materials in magnetic coupling offers the possibility of transmitting high torque through a large air-gap [14][15] while vibrations due to the space harmonics are practically suppressed.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and test of an axial-field HTS rotating machine with integrated magnetic coupling

Dolisy

Mezani

Lubin

et al. 2017

Supercond. Sci. Technol.

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High Temperature Superconducting (HTS) electrical machines have high torque density with a very high efficiency. Torque tubes are usually used to transmit the torque from the cold to the warm environment which results in thermal losses and mechanical problems. To overcome these difficulties, we propose to transmit the torque of the HTS machine through an integrated HTS magnetic coupling. A prototype has been constructed and tested showing the effectiveness of the proposed solution. The machine and the coupling share the same HTS rotor while the torque produced by the machine is transmitted to the load via a permanent magnets rotor. This solution allows the reduction of the thermal losses and a natural protection against overload during fault. The electromagnetic design is carried out using 3D finite elements. The HTS material electrical behavior is described using a power law so it was possible to determine the operating current of the HTS coils of the device. Many test results such as curves of the HTS coils, static torques, back-EMF and on-load characteristics are presented and checked by the FE computations.

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“…Hysteresis is also important in the use of high-temperature superconductors as torque couplers 67 and vibration dampers. 68 Apparently, the first successful vacuum-tunneling experiment, which eventually led to the development of the scanning tunneling microscope, was made possible by using a superconducting bearing to suppress vibrations. 69 …”

Section: Applicationsmentioning

confidence: 99%