Superconducting magnetic bearings for a 2 MW/10 kW h class energy storage flywheel system

Abstract

Single-domain crack-free CeO2-doped YBCO monoliths synthesized in a conventional box furnace using a top-seeded-melt-growth process with an optimized time–temperature profile exhibit trapped magnetic fields of up to 1.4 T and self-field critical current densities at 77 K of up to 1.3 × 105 A cm−2. The observed magnetic properties of the samples correlate with the microstructure, which was studied using optical and scanning electron microscopy. With these high quality high temperature superconductor samples a superconducting magnetic bearing for a 2 MW/10 kW h class flywheel energy storage system was designed and has been tested in a model arrangement.

YBaCuO and REBaCuO HTS for Applications

“…To realize a frictionless bearing, the flywheel has to be operated in a vacuum container. Consequently, a typical kinetic energy storage system as, for example, realized by the German 10 kW‐class DYNASTORE system 11,32,33 is comprised of the following critical components (see Fig. 4).…”

“… DYNASTORE flywheel: cross‐section view of the bearing system with the actual dimensions of the magnetic circuit. 32,33 …”

Structure and dielectric properties of $$\hbox {Ba}_{2}\hbox {Cu}_{x}\hbox {Y}_{1-x} \hbox {TaO}_{6-y}$$ double perovskite

“…Systematic analysis of YBa 2 Cu 3 O 7− (Y123) superconductor shows that Ta 2 O 5 helps to achieve large-grains [1,2] for the magnetic levitation and magnets applications [3][4][5]. The grain growth is attributed to the decrease in the peritectic temperature transformation [2], and the homogeneous segregation of Ba 2 YTaO 6 (BYT) secondary phase in the Y123 superconducting matrix acts as vortex pinning centers, which are non-superconducting regions that confine the quantum magnetic flux, and consequently, optimizes the critical current density parameter [1,6].…”

Structure and dielectric properties of Ba$_2$Cu$_x$Y$_{1-x}$TaO$_{6-y}$ double perovskite

“…Systematic analysis of YBa 2 Cu 3 O 7−δ (Y123) superconductor shows that Ta 2 O 5 helps to achieve large-grains [1,2] for the magnetic levitation and magnets applications [3][4][5]. The grain growth is attributed to the decrease in the peritectic temperature transformation [2], and the homogeneous segregation of Ba 2 YTaO 6 (BYT) secondary phase in the Y123 superconducting matrix acts as vortex pinning centers, which are non-superconducting regions that confine the quantum magnetic flux, and consequently, optimizes the critical current density parameter [1,6].…”