Title :
Variations of force-balanced coils for SMES
Author :
Nomura, S. ; Shimada, R. ; Suzuki, C. ; Tsuji-Iio, S. ; Tsutsui, H. ; Watanabe, N.
Author_Institution :
Res. Lab. for Nucl. Reactors, Tokyo Inst. of Technol., Japan
fDate :
3/1/2002 12:00:00 AM
Abstract :
Strong electromagnetic force caused by high magnetic fields and coil current is a serious problem in superconducting magnetic energy storage (SMES) systems. In facing this problem, we proposed the concept of the force-balanced coil (FBC) which is a helically wound toroidal coil applied to SMES. This paper shows the variations of the helical windings in order to reduce structure requirements. We discuss the relationship between the shape of SMES coils and the structure requirements based on the virial theorem. From this result, the FBC can minimize the working stresses by selecting the optimal number of poloidal turns.
Keywords :
electromagnetic forces; superconducting coils; superconducting magnet energy storage; 50 MWh; SMES systems; coil current; electromagnetic force; force-balanced coil variations; high magnetic fields; poloidal turns; superconducting magnetic energy storage; Electromagnetic forces; Energy storage; Machine windings; Samarium; Shape; Superconducting coils; Superconducting magnetic energy storage; Tensile stress; Toroidal magnetic fields; Wounds;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2002.1018520
