Contributions in the magnetic energy storage devices shielding and
energy confinement
Issue title: Proceedings of the twelfth International
Symposium on Interdisciplinary Electromagnetic, Mechanic and Biomedical
Problems, ISEM Bad Gastein
Affiliations: [a] The Open Polytechnic of New Zealand, 86 Wyndrum
Avenue, Lower Hutt, 6009, New Zealand | [b] Department of Electrical and Computer Engineering, The
University of Auckland, 38 Princess Street, Auckland, New Zealand | [c] Faculty of Engineering, Toyama University, Japan
Abstract: A magnetic energy storage system made in an ellipsoidal enclosure
and associated variable height superconductive coils is analysed and a
comparison with other systems possessing the same superconductive material
volume V_{s} and operating current I is
performed. Two sets of geometrical dimensions are proposed, one associated with
V_{s}=0.01 m^{3} and I=80 A and the other corresponding to V_{s} =
1.437 m^{3} and I=540 A. An efficiency
evaluation dependency W_{m}/V_{S}
−V_{Threshold}/V_{Overall},
taking into account the safety magnetic field threshold B_{Threshold}=0.5 mT distance, is introduced. The results show a
remarkable improvement achieved with the ellipsoidal structure in terms of
stored energy as well as better shielding in respect to the equivalent system
solenoid.
Keywords: Energy storage, ellipsoidal enclosure, variable height coils, ferromagnetic shielding
