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High-speed magnetic rotor

High-speed magnetic rotor with superconducting bearings has been designed as a prototype of a large scale application of HTSC with levitation and frictionless motion such as flywheels and has been tested up to 200 000 rpm [1,2]. The low energy consumption of the rotor enabled us to develop a new experimental technique to measure the energy loss in small samples in alternating magnetic field with 10-11 Watts accuracy [3].

By this method we investigate physical mechanisms for flux pinning and energy loss in bulk HTSC samples due to inter- and intragrain flux motion. In particulat we investigated magnetic flux dynamics in Y-123 and Bi-2223 granular samples and determined that flux motion there is described by intragranular thermally assisted flux flow with viscosity equal 8 105 kg/(m sec) [4,5].

We have also studied the frequency dependence of energy loss for rotors with non-ideal magnetic symmetry and found the optimization criterion for rotor designing. Low-power self-stabilizing magnetic rotors with HTS bearings have been designed on the basis of the obtained results [6].
  1. V. V. Nemoshkalenko, A. A. Kordyuk, V. F. Los, A. D. Morozovskii, B. G. Nikitin, V. A. Rafalovskii, 190 000 rpm low-power magnetic rotor with superconducting bearings - Phys. Metals 11 (no.9), 1113-1120 (1993).
  2. V. V. Nemoshkalenko, A. A. Kordyuk, B. G. Nikitin, V. A. Rafalovskii, High-speed magnetic rotor with superconducting bearings - Instruments and Experimental Techniques 34 (no.5, pt.2), 1203-1205 (1991).
  3. A. A. Kordyuk, V. V. Nemoshkalenko, High-speed magnetic rotor with HTS bearings for precision energy losses investigation - IEEE Trans. Appl. Supercond. 7 (no.2), 928-931 (1997).
  4. A. A. Kordyuk, V. V. Nemoshkalenko, A. I. Pluschay, R. V. Viznichenko, Vortex dynamics in bulk HTS with levitation techniques - NATO Sci. Ser. E: Applied Sciences 356, 583-597 (1999).
  5. A. A. Kordyuk and V. V. Nemoshkalenko, Study of the dynamics of vortex structures in bulk HTS with levitation techniques - J. Low Temp. Phys. 130, 207-235 (2003).
  6. A. A. Kordyuk, V. V. Nemoshkalenko, H. C. Freyhardt, Magnetic bearing with melt processed HTS - Adv. Cryo. Eng. 43 (part A), 727-732 (1998).


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