08Aug 2021 by admin No Comments
Use of Bulk Superconductors in the Excitation System of Low-Speed Synchronous Generators (2021)

Use of Bulk Superconductors in the Excitation System of Low-Speed Synchronous Generators (2021)

EC, NMM
Research topic: SuperconductorsModelling 3D Equivalent Space-Varying Permeability Model of HTS Bulks for Computation of Electromagnetic Forces João Arnaud; João F. P. Fernandes, Paulo J. Costa BrancoJournal: IEEE Transactions on Applied Superconductivity (2021)(Check this article) Short Abstract: This work focuses on implementing HTS bulks in the excitation circuit of low-speed synchronous generators as permanent magnets. To reduce the maintenance costs and time required for the magnetization process, an in-loco remagnetization is used. The HTS bulks are magnetized in their position inside the machine's magnetic circuit. A pulse-field magnetization (PFM) technique is used, using the stator coils of a linear generator. The experimental procedure starts with the in-loco PFM to magnetize the HTS bulks and, by applying an oscillatory movement to the linear generator's moving part, measuring the magnetic flux density induced voltage is…
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08Aug 2021 by admin No Comments
Transient study of series-connected pumps working as turbines in off-grid systems (2021)

Transient study of series-connected pumps working as turbines in off-grid systems (2021)

EEf
Research topic: Pump as TurbinesSeries Transient study of series-connected pumps working as turbines in off-grid systems Margarida C. Pagaimo, João F. P. Fernandes, ModestoPérez-Sánchez, P. Amparo López-Jiménez, Helena M. Ramos, P. J. Costa Branco Energy Conversion and Management (2021) (Check article) Short Abstract: This paper contributes for a further study and application of off-grid PAT (pump-as-turbine) systems to be installed in water distribution systems, for both rural or remote areas. This paper assesses the reliability of associating multiple groups of PAT systems in series, each connected to a self-excited induction generator (SEIG). This is an important topic that could lead to more cost-effective solutions and allow the series association of different users. This work is a follow-up of an international collaboration between the University of Lisbon and Universitat Politecnica de…
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30Jul 2021 by admin No Comments
Cobalt Iron Core Impact on Optimal Design of an Interior Permanent Magnet Synchronous Motor for Competition Electric Vehicle (2020)

Cobalt Iron Core Impact on Optimal Design of an Interior Permanent Magnet Synchronous Motor for Competition Electric Vehicle (2020)

EC, NMM
Research topic: Cobalt IronModelling Cobalt Iron Core Impact on Optimal Design of an Interior Permanent Magnet Synchronous Motor for Competition Electric Vehicle Pedro P. C. Bhagubai; António C. Cardoso; João F. P. FernandesConference: Global Power, Energy and Communication Conference (GPECOM) (2020)(Check this article) Short Abstract: To analyze the impact of cobalt iron cores in the design of interior permanent magnet synchronous motors (IPSM) for competition electric vehicles, a spoke-type IPSM geometry is optimized considering FeSi and VaCoFe cores. It is shown that machines with VaCoFe core are a better alternative across both considered torque and efficiency ranges. VaCoFe can result in an estimated increase of up to 3% in efficiency for the same torque, or up to 70% torque increase for the same efficiency level. Additional content: Optimized variables Torque-efficiency curves for…
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30Jul 2021 by admin No Comments
3D Equivalent Space-Varying Permeability Model of HTS Bulks for Computation of Electromagnetic Forces (2021)

3D Equivalent Space-Varying Permeability Model of HTS Bulks for Computation of Electromagnetic Forces (2021)

NMM
Research topic: SuperconductorsModelling 3D Equivalent Space-Varying Permeability Model of HTS Bulks for Computation of Electromagnetic Forces Inés S. P. Peixoto; F. Ferreira da Silva; João F. P. Fernandes; P. J. da Costa Branco (copy-past the authors from IEEE site, it comes with links)Journal: IEEE Transactions on Applied Superconductivity (2021)(Check this article) Short Abstract: This paper proposes a novel methodology for calculating a space-varying permeability in HTS bulks, ensuring the same magnetic energy stored in E-J models at each infinitesimal volume, for the electromagnetic force calculation in HTS bulks.  The proposed method was validated using simulation and experimental tests based on YBCO/GdBCO permanent-magnet force interactions. These results show that, with a previous general study of the geometry to optimize, the equivalent model can be used for optimization purposes, greatly reducing the computational time. Additional content:…
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