Superconducting reluctance motors with YBCO bulk material

Oswald, B.; Krone, M.; Söll, M.; Strasser, T.; Oswald, Johannes von; Best, K.-J.; Gawalek, W.; Kovalev, L.K.

doi:10.1109/77.783515

Cited by 58 publications

(18 citation statements)

References 2 publications

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“…Especially, compact and highly efficient electric motors, magnetic levitation systems and flywheel energy storage systems are most promising applications [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of decay of trapped magnetic field in HTS bulk caused by application of AC magnetic field

Tsukamoto

Yamagishi

Ogawa

et al. 2005

Journal of Materials Processing Technology

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“…Especially, compact and highly efficient electric motors, magnetic levitation systems and flywheel energy storage systems are most promising applications [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of decay of trapped magnetic field in HTS bulk caused by application of AC magnetic field

Tsukamoto

Yamagishi

Ogawa

et al. 2005

Journal of Materials Processing Technology

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“…This fascinating magnetic levitation results from the interaction of the induced current inside the superconductor with the inhomogeneous magnetic field generated by the PM. Because of its possible industrial applications, such as noncontacted superconducting bearings, 1,2 gravimeters, 3 flywheel energy storage systems, 4 -9 magnetic levitation transport systems, 10 and motors, 11 the magnetic levitation between a PM and an HTS has been the subject of intensive studies for the last decade.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the hysteretic force between a superconductor and a magnet

Qin

Liu

et al. 2002

Phys. Rev. B

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The magnetic levitation forces exerted on a high-temperature superconducting ͑HTS͒ disk by a cylindrical permanent magnet ͑PM͒ are calculated from first principles for superconductors with finite thickness. The current j( ,z) and field B( ,z) profiles in the HTS in the nonuniform magnetic field generated by the PM are derived. The levitation force depends nonlinearly on the critical current density j c and on the thickness of the HTS. The flux creep is described by a current-voltage law E( j)ϭE c ( j/ j c ) n , from which we show that the levitation force depends on the speed at which the PM approaches or recedes from the HTS, which accounts for the experimentally observed force creep phenomenon. The stiffness of the system is derived by calculating minor force loops. The numerical results reproduce many of the features observed in experiments.

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“…During the last two decades many different reluctance rotor configurations have been considered in order to improve output power and efficiency of these type of motors [2][3][4]. Recently, a number of international research groups (Department of Engineering Science, Oxford University, UK; Cambridge University, UK; Moscow State Aviation Institute, Russia; Institut fuer Physikalische Hochtechnologie, Jena, Germany; Institute de Ciencia de Materials de Barcelona, Bellaterra, Spain; CTS-UNINOVA, Caparica, Portugal and also in USA and Japan), have explored the possibility of using high temperature superconducting (HTS) materials in the construction of hysteresis and reluctance electrical machines using bulk yttrium-bariumcopper oxide elements (known as YBCO) placed in the rotor.…”

Section: Introductionmentioning

confidence: 99%