Abstract
A description of the conceptual design for the magnet structure of a large superconducting magnetic energy storage (SMES) device is presented. This work is part of a program to select the best design for a 21-MWh unit. The coil structure is a four-layer solenoid design with a mean radius of 219 ft and carries a current of 50000 A. The structure design selected and the tradeoffs among different geometries are described. The results of a parametric finite-element and closed-form stress analysis are given in order to compare different rippled coil geometries in terms of structure stresses and cyclic conductor strain. The effects of ripple radius and strut spacing are given for the cooldown, normal operation, and quench conditions.
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