A5078839265- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Metallic Glasses and Amorphous Alloys
- Superconductivity in MgB2 and Alloys
- Theoretical and Computational Physics
- Magnetic and transport properties of perovskites and related materials
- Frequency Control in Power Systems
- Magnetic properties of thin films
- Magnetic Properties and Applications
University of Lisbon
2016-2021
Instituto Politécnico de Lisboa
2016-2020
In this article, a multiobjective optimization is done to minimize the cost and volume of horizontal axis high-temperature superconductors (HTS) levitation bearing. The using 3-D finite-element analysis (FEA) an equivalent magnetic permeability model for HTS bulks depending on applied field. use rather than magnetization Kim's required perform process in feasible time. computation time FEA with 43.6 h 2.2 min. described calibrated experimental results from previously developed D5 bearing...
This paper studies the high-temperature superconductor (HTS) YBCO and GdBCO bulks pulse-field magnetization (PFM) in loco, that is, when inserted an electric machine's magnetic circuit. The PFM typically uses cryogenic hall sensors to monitor process. However, install excitation circuit of electrical machine may increase air gap cost. To surpass that, this presents indirect technique capable monitoring process through applied pulse voltage associated current transient waveform. Last,...
This paper introduces a preliminary analysis concerning the use of YBCO bulk magnets when operating in magnetic environment low-speed synchronous generators. A coupled electrothermal Comsol model YBCOs is first developed, tested, and experimentally verified. Joule losses HTS magnet are then studied under ac homogeneous standing field wave with frequencies amplitude ranges that usually found on those The capability maintaining its magnetization level subjected to conditions was also analyzed...
This work focuses on implementing HTS bulks in the excitation circuit of low-speed synchronous generators as permanent magnets. In addition to implementation study, it is also addressed remagnetize electric generators. To reduce maintenance costs and time required for magnetization process, an in-loco remagnetization used. The are magnetized their position inside machine's magnetic circuit. A pulse-field (PFM) technique used, using stator coils a linear generator. YBCO GdBCO samples tested....