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Abstract
| Stacks of high-temperature superconducting tape have proved to trap in laboratory conditions
levels of magnetic flux density one order of magnitude above actual state-of-the-art permanent
magnets. Their simple manufacturing, high mechanical properties and intrinsic resistance to
sudden quench greatly facilitate their utilization in industrial applications, amongst them, as a
source of magnetic flux density in the rotor of electrical machines. For this to happen, the
currents induced in the superconducting layers of the stack must not be disturbed during
operation. This work studies in experimental conditions the demagnetization of a stack rotating
in the airgap of an electrical motor under slot and winding-induced cross-field components,
whose values are estimated via conventional 2D finite element analysis. The results are
congruent with previous laboratory studies and show small long-term demagnetization rates that
may allow operation for time spans longer than initially established. |