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Rotational dynamics of passive high Tc superconducting bearings

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1 Author(s)
Weeks, David E. ; The Hebrew University of Jerusalem, Fritz Haber Molecular Dynamics Research Center, Jerusalem 91904, Israel

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The rotational dynamics of passive high Tc superconducting bearings are discussed. Rotor deceleration as a function of time is measured using a bare rotor, a rotor with paddles, and a rotor with a small magnetic chip used to induce magnetic asymmetry. All three cases are fit to within experimental error using solutions to a first order differential equation where the decelerating torque is given by a constant term described by the critical‐state Bean model, plus a term linear in the rotational frequency described by the Stokes ‘‘slow flow’’ approximation to the Navier–Stokes equations in the limit of small Reynolds number.

Published in:

Journal of Applied Physics  (Volume:70 ,  Issue: 3 )

Date of Publication:

Aug 1991

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