A5040179816- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Frequency Control in Power Systems
- Magnetic Properties and Applications
- Superconductivity in MgB2 and Alloys
- Electric Motor Design and Analysis
- Magnetic confinement fusion research
- Fuel Cells and Related Materials
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Electromagnetic Compatibility and Measurements
- Thermal properties of materials
- Advancements in Solid Oxide Fuel Cells
- Magnetic Bearings and Levitation Dynamics
- Wireless Power Transfer Systems
- Induction Heating and Inverter Technology
- Electrostatic Discharge in Electronics
- Particle accelerators and beam dynamics
University of Edinburgh
2024
Victoria University of Wellington
2020-2024
Shanghai University
2018
Abstract In many high-temperature superconducting applications, REBCO (Rare-earth barium copper oxide) coils carry DC currents under AC magnetic fields, such as the field winding of rotating machines, linear synchronous motors and electro-dynamic suspension system maglev. operating conditions, generate loss—total loss which includes magnetization due to shielding currents, dynamic arising from resistance caused by interaction fields. this work, total in a small double pancake coil (DPC)...
Superconducting machine designs have historically focused on an isolated, cryogenic rotor and conventional (copper) stator due to unacceptable levels of AC loss in a superconducting stator. Thus, reduction the armature windings is one key issues for achieving practical all-superconducting motors that could deliver unprecedented power density significantly reduce complexity. In this paper, 100 kW, 1500 rpm, all - HTS motor operating at 65 K designed simulations wound with different types...
High-temperature superconducting (HTS) technology provides an alternative approach to achieve compact transformers. Addressing AC loss in the HTS winding is crucial for transformer applications. Most numerical studies on transformers have neglected influence of iron cores. This work carries out study explore impact core windings a 3-phase 1 MVA coupled with it. simulations both and without are conducted by adopting three-dimensional (3D) T-A homogenization method. When incorporated,...
Abstract AC loss in high temperature superconducting (HTS) coils affects the performance of HTS devices. Using magnetic flux diverters (MFDs) is an effective way to reduce coils. In this paper, measurement and finite element method simulation results a REBCO coil assembly comprising four double pancake with two molypermalloy-powder MFDs are presented. Both experimental numerical show that can significantly while generating negligible themselves. Further, influence distance between on...
Achieving low AC-loss armature windings is a key challenge to enable all-HTS motors. Large induced in the HTS through interaction with rotating magnetic field generated by rotor. To reduce AC loss windings, it important minimize impact of field, especially component perpendicular broad face REBCO conductors. This work presents two different 1500 rpm, 50 kW motor designs iron pole shapes: one shoes on core for diverting flux around coil and without shoes. coated conductors are considered both...
Abstract The threshold magnetic field is a key parameter for evaluating the current decay caused by dynamic resistance in superconducting windings and magnets. For direct current-carrying slab under an AC parallel field, analytical theory clearly shows that there only one electric central line (ECL) across width at onset of resistance. However, fields strips coils have not been fully investigated. Based on one-ECL criterion, this paper first presents method numerically determining via...
Despite the fact that a radio frequency (RF) shielding box affects coil inductance used in matching network, RF engineers have measured open space on designing networks since it is difficult to precisely measure within box. In this work, we investigate influences of via 3D full electromagnetic wave simulation. Simulation results shows decreases from −6.0% −11.9% compared with its ideal depending positions Both inductive and capacitive coupling between surfaces contribute reduction...