admin – 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…

17May 2022 by admin No Comments

5th Meeting of the Young Researchers of LAETA (2022)

Events

Event 5th Meeting of the Young Researchers of LAETA Previous Next On May 5-6, 2022, our young researchers participated in the 5th Meeting of Young Researchers of LAETA, presenting their research works: Andrés Zúñiga; António Costa; Eduardo Sarquis; Francisco Silva; Inês Peixoto; Pedro Bhagubai. Design of a Superconducting Machine with CORC Windings for Aircraft Propulsion The main topic of this presentation was the variables and design constraints pertaining to the propulsion system requirements that are needed to be addressed before assessing the design of a superconducting machine. A more extensive review is here. A multi-objective optimization is performed to analyze the best geometries for specific power and efficiency. Equivalent Models for CORC and Bulks are to be used for fast computation and enough accuracy. This models are tested for several…

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…

07Sep 2021 by admin No Comments

Why Can Simple Operation and Maintenance (O&M) Practices in Large-Scale Grid-Connected PV Power Plants Play a Key Role in Improving Its Energy Output? (2021)

EEf

Research topic: Photovoltaic SystemOperation&Maintenance Why Can Simple Operation and Maintenance (O&M) Practices in Large-Scale Grid-Connected PV Power Plants Play a Key Role in Improving Its Energy Output? Hamid Iftikhar, Eduardo A. Sarquis Filho, P. J. da Costa BrancoMDPI Energies (2021)(Check article) Short Abstract: In this paper, a comparative analysis is done using real field data and simulation to assess the PV power plant underperformance and indicates the most important predictive maintenances actions. Issues in the tracking systems, inverters and combiner boxes were reported. In addition, an analysis of the O&M power plant reports was performed and compared to the best global practices. In this case, the adoption of predictive maintenance and automated plant diagnosis at the strings level were recommended. Additional content:

07Sep 2021 by admin No Comments

A complete framework for the simulation of photovoltaic arrays under mismatch conditions (2021)

EEf

Research topic: Photovoltaic SystemModelling A complete framework for the simulation of photovoltaic arrays under mismatch conditions Eduardo A. Sarquis Filho, Carlos A. F. Fernandes, P. J. da Costa BrancoElsevier Solar Energy (2021)(Check article) Short Abstract: This paper introduces a complete a simulation framework capable of reproduce mismatch conditions at the cell level, including failures. The results were validated experimentally for mismatch conditions due to shading but also due to failures. The simulation framework is more suitable to emulate small arrays with few strings, being a helpful tool for the study of failure impacts on PV strings.

10Aug 2021 by admin No Comments

VIENA – Veículo Inteligente Elétrico de Navegação Autónoma

Project

Research topic: Electric Vehicles VIENA - Intelligent Electric Vehicle with Autonomous Driving (Veículo Inteligente Elétrico de Navegação Autónoma)Internal project of E2TES Objectives: To develop a learning platform for the DEEC students regarding vehicles with electric and autonomous capabilities; The entire project is aimed to be for students and developed and improved by students. All parts of the project are to be open and free, accessible to all students from around the world. https://www.youtube.com/watch?v=w1iibaJBaag Check more here! Works developed by this team: Autonomous drivingSpeed Control TestSteering Control Teshttps://www.youtube.com/watch?v=w1iibaJBaaghttps://youtu.be/304CCp7y9Lkhttps://youtu.be/KB9a7eYezl0Simulation Model (LINK)

10Aug 2021 by admin No Comments

REDAWN – Reducing Energy Dependency in Atlantic Area Water Networks, Program Interreg, EU (2016-2021)

Project

Research topic: Energy Recovery REDAWN – Reducing Energy Dependency in Atlantic Area Water Networks P.I.: prof. Helena Ramos (IST coordinator)Collaboration of Prof. Paulo Branco and Prof. João FernandesFunded by Interreg Program, EU Objectives: Completion of an energy recovery resource assessment in water networks in the Atlantic Area; Completion of an economic/environmental impact assessment of this technology on the region; Development of design guidelines and support tools for hydropower energy recovery in drinking water, waste-water, irrigation and process industry sectors; Development of policy and institutional support tools to increase the implementation of energy recovery projects; Quantification of the societal impacts of hydropower energy recovery in water networks, and; Widespread dissemination and promotion of energy efficiency in Atlantic Area water networks. Works developed by this team: Electric behavior of the Pump working…

10Aug 2021 by admin No Comments

YBCO Superconducting Blocks Inserted in Electromechanical Systems (2016-2019)

Project

Research topic: Superconductors YBCO Superconducting Blocks Inserted in Electromechanical Systems P.I.: Prof. Paulo José da Costa BrancoFunded by FCT: PTDC / EEI-EEL / 4693/2014. From April 22, 2016 to April 21, 2019. Funding of € 112,072.00. Objectives: This research project focused on the modelling and application of HTS bulk in electromechanical systems. The main task performed were:1) Formulation of a distributed parameter model of YBCO for simulation of electromagnetic and thermal properties. 2) Study of the in-loco pulsed magnetization process of the YBCO superconductor cooled to 77K: the number of pulses required for the magnetization of the material;3) Selection of optimized magnetic circuit topology for a low-speed generator; 4) Development and testing of a prototype of the low-speed generator. Developed works: In-loco HTS magnetization processZero-Field-Cooled Superconducting Levitation BearingHTS Electromagnetic and Thermal Modelling…