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In high power density superconducting motors, superconducting tapes areusually stacked and connected together at terminals to improve the currentcapacity. When a parallel sinusoidal magnetic field is applied on thispartially coupled stack, the coupling current is induced and causes additionalcoupling loss. Usually 3D modeling is needed to calculate the coupling loss butit takes too much computing resource and time. In this paper, a numerical 2Dmodeling by minimum electromagnetic entropy production (MEMEP) method isdeveloped to speed up the calculation. The presented MEMEP model shows goodaccuracy and the capability to take the realistic resistance between tapes intoaccount for coupling loss calculation with a high number of mesh element, whichagrees to measurements.Thanks to the model, a systemic study of coupling losson amplitude-dependence, frequency-dependence, resistance-dependence, andlength-dependence, is presented and discussed. The results reveal the featuresof coupling loss which is very helpful devices with multi-tape conductors, suchas the stator or rotor windings of motors.

Coupling loss at the end connections of REBCO stacks: 2D modelling and measurement