EC – 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

Experimental Assessment of Cryogenic Cooling Impact on Induction Motors (2022)

EC

Research topic: Electrical MachineCryogenic Experimental Assessment of Cryogenic Cooling Impact on Induction Motors Luís F. D. Bucho; João F. P. Fernandes; Marco Biasion; Silvio Vaschetto; Andrea Cavagnino;Journal: IEEE Transactions on Energy Conversion (2022)(Check this article) Short Abstract: In this work, an experimental assessment of the influence of cryogenic cooling in a conventional induction motor is presented. The performance of a fractional kilowatt induction motor is evaluated when submerged in liquid nitrogen. Using the single-phase equivalent electric circuit, the influence of the temperature and skin-effect is analyzed in the variation of the machine’s parameters, under ambient and cryogenic conditions. Also, the variation of the iron core and mechanical losses are evaluated. An analytical methodology is proposed to estimate the change of motor performance under cryogenic conditions. The experimental tests in cryogenic conditions show the…

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…

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…