The model coil with the racetrack geometry based on second generation
(2G) High Temperature Superconducting (HTS) tapes has been developed for
an electrical machine where a winding pack is a stack of 2G HTS tapes.
It is important to evaluate transport current AC losses and possible
methods to reduce them in a winding. In a device made of 2G HTS tapes,
the main the AC losses are the hysteresis ones. Only numerical
simulation permits to predict them in full. The FEM model for
calculation of the hysteresis losses developed before for 2G HTS power
cables was modified for a stack of the 2G HTS tapes in a coil. In this
paper the methods to increase a computational speed are presented.
Possible ways to reduce AC losses are discussed also. The details of the
model and comparisons of calculations with measurements of the AC loss