Electromagnetic Behavior Simulation of REBCO Pancake Coils Considering REBCO Tape Rotation Under High Magnetic Field

Abstract

Since the screening current induced in rare earthbarium-copper-oxide (REBCO) magnet generates an irregular magnetic field, a few screening current simulation methods have been proposed. For an insert REBCO magnet generating ultrahigh magnetic field, a new screening current method has been proposed with consideration of the coil-deformation effect.In this paper, we have developed a new screening current method based on a partial element equivalent circuit (PEEC) model coupling with a two-dimensional stress finite element analysis to accurately the time-transient distribution of accurate screening current. In the presented method, the changes of self/mutual inductances are considered due to the coil deformation. As the simulation results, it was found that the coil deformation affected the screening current distribution. When considering the coil deformations, the screening current-induced fields to operating current are different for charging cycles. It is necessary to simulate the coil deformation to accurately estimate the screening current and the screening current-induced field.

Electromagnetic-mechanical coupling analysis of high-temperature superconducting racetrack coil

“…Li et al investigated the effect of separation on the contact resistance and field delay time of a no-insulation layer wound coil with the simplified electromagnetic-mechanical model [45]. Noguchi et al developed an extended partial element equivalent circuit model, which considers the changes of self/mutual inductances caused by the coil deformation, to simulate the screening current [46,47]. However, the above works mainly focus on the circular HTS coil.…”

Inductive Voltage of Insert HTS Coils Due to Coil Deformation for Ultra-High Magnetic Field Generation

“…We have previously developed the partial element equivalent circuit (PEEC) model to investigate screening current behaviors of REBCO pancake coils [21]. The model has been improved considering the effect of the coil configuration deformation [22]. Yet, the inductance change due to the deformation has been ignored mainly because it was expected to be negligible.…”