Modeling of stacked single-layer coils wound with Bi2223 tapes using a lumped constant circuit

Tetsuhiro OBANA, Nozomu NANATO

Stacked single-layer (SSL) coils wound with Bi2223 HTS tapes were modeled with a lumped circuit. Using
the model, we investigated the effect of the joint resistance at coil terminals on the generated voltage for the
SSL coils. The investigation shows that the joint resistance must be reduced as much as possible to restrain the
voltage occurred in the SSL coils and each joint resistance should be uniform to make the current distribution
uniform in the SSL coils. Additionally, we investigated the effect of inductance on the current distribution in the
SSL coils and the effect of the tape’s degradation on the coil performance. As a result, the current distribution of
the SSL coils can be uniform due to the joint resistance even though the SSL coils have different inductances in
each coil winding. Further, the current distribution and the voltage of the SSL coils are influenced by the tape’s
degradation.

Plasma and Fusion Research

accepted