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Trapped‐flux spin‐down torques on a spherical superconducting gyroscope
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16.The London moment is essentially fixed in space, since the largest of the anticipated relativistic effects will change the orientation of the spin axis by only 7 seconds of are per year, and if the design goals are met, error torques will change the orientation of the spin axis by no more than 0.001 are second per year. However, a slow roll of the satellite about the optical axis of its telescope with a period of about 5 h is planned, so that the location of the electrodes relative to the spin axis will change at the roll frequency Since the electrodes can be treated as stationary for the loss calculation; the average of precessional torques due to trapped flux will be reduced by a factor sinζ, where ζ is the angle between the spin axis of the gyroscope and the roll axis of the spacecraft.
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24.The cross section of the rotor will intercept about in this field; since each flux line must pass through the surface of the rotor twice.
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