NMM – E2TES

02Feb 2023 by admin No Comments

Experimental Assessment of HTS Tapes on HTS-ISM (2023)

EC, NMM

Research topic: Electrical MachineSuperconductors Experimental Assessment of HTS Tapes on HTS-ISM (2023) Luís F. D. Bucho; Francisco Silva; João F. P. Fernandes, P. J. Costa Branco Work in progress Short Abstract: This preliminary work focuses on the application of HTS tapes on the rotor of induction machines (HTS-ISM). To evaluate the electromagnetic and mechanical performance of HTS tapes in this type of machines, a magnetic circuit prototype to mimic the operating conditions of the HTS-ISM is in development. AC loss measurements in 1G BSCCO and 2G YBCO have been done. For tapes characterization, a cost-effective setup was implemented to test each tape performance under self-field and applied magnetic field conditions. Special focus is given to the start-up and synchronous to slip mode transients (respectively, high frequency induced currents and losses behaviour). This…

21Jul 2022 by admin No Comments

Optimal Design of an Interior Permanent Magnet Synchronous Motor with Cobalt Iron Core (2021)

EC, NMM

Research topic: Electrical Machine DesignCobalt-Iron Optimal Design of an Interior Permanent Magnet Synchronous Motor with Cobalt Iron Core Pedro P. C. Bhagubai, Luís F. D. Bucho, João F. P. Fernandes and P. J. Costa BrancoJournal: Energies (2022)(Check this article) Short Abstract: The use of a cobalt-iron (VaCoFe) core is investigated as an alternative to silicon-iron (FeSi) in the design of interior permanent magnet synchronous motors (IPMSM). Considering VaCoFe and FeSi cores, a spoke-type IPMSM geometry is optimized for a torque range up to 40 N·m, providing a general comparative analysis between materials. This is done considering the application of a four-motor competition vehicle’s powertrain. VaCoFe allows an estimated increase of up to 64% in torque for the same efficiency level, or up to 5% in efficiency for the same torque. Additional…

01Mar 2022 by admin No Comments

Optimization of the Guiding Stability of a Horizontal Axis HTS ZFC Radial Levitation Bearing (2021)

NMM

Research topic: Superconductors Optimization of the Guiding Stability of a Horizontal Axis HTS ZFC Radial Levitation Bearing A. J. Arsénio, F. F. da Silva, João F. P. Fernandes, Paulo J. Costa BrancoJournal: Actuators(Check this article) Short Abstract: This document presents a study on the optimization of the 3D geometry of a horizontal axis radial levitation bearing with zero-field cooled (ZFC) high-temperature superconductor (HTS) bulks in the stator, and radially magnetized permanent magnet (PM) rings in the rotor. The optimization of component dimensions and spacing to minimize the volume or cost concerning only the maximization of the levitation force was previously studied. The guidance force and guiding stability depend on the spacing between PM rings in the rotor and between the rings of HTS bulks in the stator. This new optimization…

08Aug 2021 by admin No Comments

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…

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)

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…

30Jul 2021 by admin No Comments

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:…