Characterization of High-Temperature Superconductor Bulks for Electrical Machine Application

Abstract

High-temperature superconducting (HTS) bulks can be used in electrical applications. Experimental characterization of large-size HTS bulks is a tricky issue. The relevant parameters for their application were directly measured in this study. This paper has three main aims. Firstly, features of YBaCuO bulks are presented. Secondly, an electrical motor application is developed using magnetic field shielding and trapping. Thirdly, the HTS bulks are characterized. Several classical methods were used, which are mainly magnetic methods only available for small samples. The complete penetration magnetic field and the critical current density were found to be the main parameters relevant for applications. An innovative entire HTS bulk characterization method is presented. This characterization method is useful for end users and engineers to better implement HTS bulks.

Numerical Modelling of the Dynamic Voltage in HTS Materials under the Action of DC Transport Currents and Different Oscillating Magnetic Fields

“…Later on, scientists defined the critical temperature (the transition temperature from superconducting state to normal state) as 30 K, to distinguish the low-temperature superconductor (LTS) and hightemperature superconductor (HTS) [2]. The practical superconductors for engineering can be made in the forms of bulks or wires (tapes) [3,4]. For commercial superconducting wires, based on different manufacture processes, there are two generations of superconductors: 1st generation (1G) superconducting wires use the powder-in-tube process, such as the superconducting wires use the coated conductor method to deposit the rare-earth-bariumcopper-oxide (REBa 2 Cu 3 O 7 , RE: rare earth [5]) on flexible metal tapes coated by multiple buffering layers [6].…”

Soft Superconductors: Materials and Applications

“…Thus, superconductivity is a phenomenon first understood, approaching close to 4 degrees Celsius of absolute temperature in Kelvin [16]. Twenty-two years after this work, German researchers Walther Meissner and Robert Ochsenfeld, while studying the behavior of matter at extremely cold temperatures, found that a superconducting material affects the magnetic field [17][18][19]. As in the working principle of the electric generator, a magnet moved in a conductor induces an electric current.…”

Review on the Use of Superconducting Bulks for Magnetic Screening in Electrical Machines for Aircraft Applications

“…The development of High-Temperature Superconductors (HTSs) such as the cuprate family with the REBaCuO superconductors (Rare Earth elements (RE)), the Iron-Based Superconductors (IBS) with the Pnitide and Chalcogen families and the MgB 2 compound allow a quick evolution of superconducting devices for many applications. Among them, lead by ecological, economical, and practical needs, the electrical machines associated with superconducting materials such as electromagnet [1], permanent magnets [2][3][4][5], or windings [6,7] look increasingly more attractive for future transports such as electrical ships [8], aircraft [9][10][11], and levitation trains [12] for the high specific power potential of HTS machines. Indeed, for the aviation sector in particular, the growing need for electrical power on board requires the development of electrical machines with a target power-to-weight ratio of 20 kW/kg for MW class machines [4,13,14].…”