Speaker
Description
Spiral copper-plated striated coated-conductor (SCSC) cables, in which copper-plated multifilament coated conductors are wound around a metal core with a circular cross-section, are characterized by both low ac losses and high robustness against thermal runaway or quench, as well as large current capacity and excellent mechanical flexibility. Taking advantage of these features, SCSC cables are expected to be applied to coil windings for rotating machines and magnets generating time-varying magnetic fields for accelerators and fusion reactors. To discuss the possibility of these applications, it is necessary to evaluate the ac losses and the accuracy of the generated magnetic fields of coils wound with SCSC cables by electromagnetic field analyses. However, there has not been sufficient study from a practical viewpoint on how to consider the influence of curved geometry and magnetization interaction of adjacent cables that should be considered in the electromagnetic field analysis for coils wound with SCSC cables.
We are working on analytical techniques for curved SCSC cables and for multiple SCSC cables in adjacent rows to develop an electromagnetic field analysis model of coil windings composed of SCSC cables. In conventional analysis models of curved spiral cables, the width of the coated conductors varies. However, considering that the ac losses and the magnetization strongly depend on the width of the coated conductors, and that the width of the coated conductors does not change when the actual spiral cable is bent, the above modeling is inappropriate, and then, we propose a new modeling method. In our analysis model of curved SCSC cables, the width of the coated conductors that consists of the SCSC cable does not change, and spacing between the coated conductors changes.
Using this analysis model, electromagnetic field analyses are performed for the case of curved SCSC cables lined up next to each other, simulating coil windings and carrying currents under external magnetic fields. We evaluate ac losses, magnetization of coated conductors, and generated magnetic fields under magnetic fields of various amplitudes and applied angles. In addition, methods for reducing the degree of freedom in the analyses of adjacent cables will be also discussed.
This work was supported by JST-ALCA-Next Program Grant Number JPMJAN24G1, Japan.
