Title :
Design considerations for force-balanced coil applied to SMES
Author :
Nomura, Shinichi ; Ajiki, Dabide ; Suzuki, Chisato ; Watanabe, Naruaki ; Koizumi, Etsuko ; Tsutsui, Hiroaki ; Tsuji-Iio, Shunji ; Shimada, Ryuichi
Author_Institution :
Res. Lab. for Nucl. Reactors, Tokyo Inst. of Technol., Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
Strong electromagnetic force caused by high magnetic field and large coil current is a serious problem in superconducting magnetic energy storage (SMES) systems. In facing this problem, we propose the concept of force-balanced coil (FBC) which is a helical-winding toroidal coil and can reduce the centering force of toroidal field coil (TFC). The helical-winding of the FBC is modulated in order to reduce the torsional force. This paper describes the cost-related parameters of the FBC in terms of the dimension of the coil, the ampere-meters of superconductors and the surface area of the coil compared with the TFC and the solenoid. Moreover, we discuss the structure requirements by the virial theorem and improve the concept of FBC in terms of the further optimization of SMES through the structural analysis
Keywords :
electromagnetic forces; superconducting coils; superconducting magnet energy storage; SMES; electromagnetic force; force-balanced coil; helical-winding toroidal coil; high magnetic field; large coil current; solenoid; structural analysis; superconducting magnetic energy storage; toroidal field coil centering force; torsional force reduction; virial theorem; Conductors; Electromagnetic forces; Energy storage; Machine windings; Magnetic analysis; Samarium; Solenoids; Superconducting coils; Superconducting magnetic energy storage; Toroidal magnetic fields;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
