Conveners
M3Or4P: Experiment and Modelling of Magnetization and AC Losses in Superconductors
- Mike Sumption (The Ohio State University)
- Naoyuki Amemiya (Kyoto University)
Electrification of transport is a growing trend. Traction transformers are critical components of Chinese high-speed-trains. Traditional oil-based single-phase 25 kV/1.9 kV traction transformers have a weight of 6 tones, the efficiency less than 94%, and fire risk. The use of HTS has been proposed for compact and light weight traction transformers for Chinese high-speed-trains. The...
The development of ultrahigh power density rotating machines is a research priority identified by electric aircraft programs worldwide, including ARPA-E, NASA, Airbus, and many others. The reduction of alternating current (AC) losses of all components in rotating machines is critical to reduce to manageable levels, and AC losses can be the dominant factor affecting the machine efficiency and...
It is well known that screening currents induced in REBCO coils are an annoying phenomenon. Due to the thin tape shape of REBCO coated conductors, the large amount of screening currents are induced, and unexpected magnetic fields are generated. It worsens the magnetic field quality of REBCO magnets by which homogeneous fields are required as applications of NMR and MRI. Recent years, it was...
AC losses in conductor-on-rounded-core (CORC) cables of the YBCO High-temperature Superconducting (HTS) tapes represent a significant challenge in HTS power applications. Two Finite Element Analysis (FEA) models were employed to understand the AC loss contributions and provide approaches for reducing AC losses in those cables. The FEA model based on T-A formula treated the cross-section of...
Rare-earth barium copper oxide (REBCO) coated conductor can be fabricated into Roebel cable for the realization of larger stored energy high field magnets. There are two factors, current sharing and ac losses, that are critical to the stability and quench protection of the high field magnets and cables. Those two factors are strongly dependent on inter-strand contact resistance (ICR) of the...
This study presents a finite element method (FEM) analysis of magnetization AC loss in REBCO coated conductor tape and helical wound tape conductors. AC loss is a significant factor that limits the practical application of superconducting cables and coils, and it is crucial to accurately predict and minimize the loss for the practical application of superconducting systems. The FEM analysis...
The magnetocaloric effect is a phenomenon where certain materials change temperature when exposed to a change in magnetic field. This adiabatic temperature change in temperature at or below a magnetocaloric material’s Curie point can be combined with heat transfer fluid flows to perform refrigeration cycles such as the Active Magnetic Regenerative Refrigeration cycle (AMRR). Detailed analysis...
