Strain Characteristic of a Toroidal HTS-SMES Fabricated by YBCO Stacked-Tape Cables

In need of high current carrying capacity, tapes are usually assembled in a cable. There are several cable options and one of them is the YBCO stacked-tape cable. In this paper, four YBCO tapes were stacked and pancake coils were constructed, which are the components of a toroidal superconducting magnetic energy storage system. The stacked-tape cable could improve the operating current of the toroidal magnet, and, therefore, increase the stored energy. However, the stress experienced by the conductor will also be very high. In this paper, numerical simulation analyses of stress and strain combining electromagnetic fields and mechanical behaviors were performed to investigate the effect of the electromagnetic forces on the coil and the support structure.