  In high power density superconducting motors, superconducting tapes are
usually stacked and connected together at terminals to improve the current
capacity. When a parallel sinusoidal magnetic field is applied on this
partially coupled stack, the coupling current is induced and causes additional
coupling loss. Usually 3D modeling is needed to calculate the coupling loss but
it takes too much computing resource and time. In this paper, a numerical 2D
modeling by minimum electromagnetic entropy production (MEMEP) method is
developed to speed up the calculation. The presented MEMEP model shows good
accuracy and the capability to take the realistic resistance between tapes into
account for coupling loss calculation with a high number of mesh element, which
agrees to measurements.Thanks to the model, a systemic study of coupling loss
on amplitude-dependence, frequency-dependence, resistance-dependence, and
length-dependence, is presented and discussed. The results reveal the features
of coupling loss which is very helpful devices with multi-tape conductors, such
as the stator or rotor windings of motors.
