Proposal of a Fully Superconducting Motor for Liquid Hydrogen Pump With MgB<formula formulatype="inline"><tex Notation="TeX">$_{2}$</tex> </formula> Wire

Abstract

Abstract-The outline design of a fully superconducting motor for liquid hydrogen pump with a magnesium-diboride (MgB2) superconducting wire is carried out to present various advantages arising from its prospective performances. The squirrel-cage rotor winding composed of superconducting loops with the MgB2 wire enables us to operate the motor not only in a slip mode but also in a synchronous rotation mode, and consequently the rotor winding loss can be suppressed drastically. Furthermore, it would be expected that the stator winding loss becomes smaller by using the MgB2 wire compared with familiar normal metals as typified by a copper. The time evolution of magnetic field distribution around the stator winding is obtained by means of a finite element analysis in order to estimate the AC loss and the primary circuit resistance.

Optimization of the fabrication process for high trapped field MgB2 bulks

“…Since the discovery of superconductivity in MgB 2 at 39 K [1] an enormous effort has been devoted to processing, characterization, and application of MgB 2 material [2,3]. The superconducting transition temperature of MgB 2 is significantly lower than in YBa 2 Cu 3-O y ''Y-123''.…”

Flux Pinning and Superconducting Properties of Bulk MgB2 with MgB4 Addition

“…Superconducting MgB 2 bulks can be produced by a cheap, scalable synthesis via solid-state sintering process. [1,2] Another advantage of this material is that the high critical current density is not hindered by weak-link grain boundaries as in cupratebased superconductors. Large-size products of various intricate shapes (discs, pellets, rings, etc.)…”

Production and Characterization of Bulk MgB2Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

“…Since 2001, the discovery of superconductivity in MgB2 material has led to notable progress concerning especially the understanding of the origin of the large Tc, processing, characterization, and industrial applications [1][2][3]. The intermetallic material is more attractive for the next generation of superconducting applications because of the lack of weak-links at the grain boundaries and a high critical transition temperature of 39 K as compared to the conventional NbTi.…”

“…The intermetallic material is more attractive for the next generation of superconducting applications because of the lack of weak-links at the grain boundaries and a high critical transition temperature of 39 K as compared to the conventional NbTi. The superconducting transition temperature of MgB2 is significantly lower than that of YBa2Cu3Oy "Y-123", instead, MgB2 benefits of a high critical current density (Jc) in the polycrystalline state, which makes these materials promising candidates for several industrial applications including the next generation of super-magnets for medical devices, electrical power system, transportation and powerful super-magnets operating at around 20 K [3][4][5][6][7][8][9]. For superconducting super-magnet applications, it is required to produce good quality, low cost MgB2 material with high Jc and an acceptable mechanical performance.…”