Search results for "Electronic engineering"

showing 10 items of 8802 documents

Measurements on partial discharge in on‐site operating power transformer: a case study

2018

This study presents the case study of a substation in-service power transformer referred to the on-site partial discharge (PD) detection and evaluation methods. An original methodology for simultaneous application of three methods is proposed: electrical, acoustic and ultra-high frequency. Transformer is powered by the power grid and no external generator is required according to the proposed methodology. Furthermore, several possibilities of applying these concurrent measurements and benefits of such solution in terms of result interpretation, interference resistance and on-site measurement applicability are indicated. The proposed methodology allows for a fast, accurate and secure PD diag…

010302 applied physicsComputer science020209 energyEnergy Engineering and Power TechnologyHigh voltage02 engineering and technologycomputer.software_genre01 natural sciencesExpert systemlaw.inventionUltra high frequencyControl and Systems Engineeringlaw0103 physical sciencesEvaluation methodsPartial discharge0202 electrical engineering electronic engineering information engineeringElectronic engineeringPower gridElectrical and Electronic EngineeringTransformerInterference resistancecomputerIET Generation, Transmission & Distribution
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FPGA based digital lock-in amplifier for fNIRS systems

2018

Lock-In Amplifiers (LIA) represent a powerful technique helping to improve signals detectability when low signal to noise ratios are experienced. Continuous Wave functional Near Infrared Spectroscopy (CW-fNIRS) systems for e-health applications usually suffer of poor detection due to the presence of strong attenuations of the optical recovering path and therefore small signals are severely dipped in a high noise floor. In this work a digital LIA system, implemented on a Zynq® Field Programmable Gate Array (FPGA), has been designed and tested to verify the quality of the developed solution, when applied in fNIRS systems. Experimental results have shown the goodness of the proposed solutions.

010302 applied physicsComputer scienceAmplifier0206 medical engineeringLock-in amplifierDigital lock-in amplifier02 engineering and technology020601 biomedical engineering01 natural sciencesNoise floorSettore ING-INF/01 - ElettronicaSilicon photomultiplier (SiPM)Quality (physics)0103 physical sciencesElectronic engineeringContinuous waveFunctional near-infrared spectroscopyField-programmable gate arrayFpgaFunctional near-infrared spectroscopy
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The filter and calibration wheel for the ATHENA wide field imager

2016

The planned filter and calibration wheel for the Wide Field Imager (WFI) instrument on Athena is presented. With four selectable positions it provides the necessary functions, in particular an UV/VIS blocking filter for the WFI detectors and a calibration source. Challenges for the filter wheel design are the large volume and mass of the subsystem, the implementation of a robust mechanism and the protection of the ultra-thin filter with an area of 160 mm square. This paper describes performed trade-offs based on simulation results and describes the baseline design in detail. Reliable solutions are envisaged for the conceptual design of the filter and calibration wheel. Four different varian…

010302 applied physicsComputer scienceDetectorFilter wheel mechanism FEM structural and acoustic analysis ATHENA WFIVolume (computing)Blocking (statistics)01 natural sciencesSquare (algebra)Settore FIS/05 - Astronomia E AstrofisicaPosition (vector)Filter (video)0103 physical sciencesElectronic engineeringCalibration010303 astronomy & astrophysicsSimulation
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Modeling Stator Winding Inter-Turn Short Circuit Faults in PMSMs including Cross Effects

2020

Author's accepted manuscript. © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. This paper presents a detailed analysis of stator winding inter-turn Short Circuit (ITSC) faults, taking the cross effects in the three phases of a permanent magnet synchronous motor (PMSM) into account by considering insulation degradation resistances. A PMSM with series coils in eac…

010302 applied physicsComputer sciencebusiness.industryStator020208 electrical & electronic engineering02 engineering and technologyStructural engineeringFault (power engineering)01 natural sciencesFinite element methodVDP::Teknologi: 500::Elektrotekniske fag: 540law.inventionInductancelawElectromagnetic coil0103 physical sciencesTurn (geometry)0202 electrical engineering electronic engineering information engineeringbusinessSynchronous motorShort circuit
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Custom measurement system for memristor characterisation

2021

Abstract A cheap, compact and customisable characterisation system for memristor devices, working between ± 10 V, is presented. SPICE (Simulation Program with Integrated Circuit Emphasis) simulations are performed to verify the circuit feasibility and a proper software is developed to drive the system. The potentiality of the realised system is tested by performing several electrical measurements on both Cu/HfO2/Pt memristors and two-terminals commercial devices.

010302 applied physicsComputer sciencebusiness.industrySystem of measurementSpiceEmphasis (telecommunications)02 engineering and technologyMemristorIntegrated circuit021001 nanoscience & nanotechnologyCondensed Matter PhysicsSettore ING-INF/01 - Elettronica01 natural sciencesElectronic Optical and Magnetic Materialslaw.inventionSoftwarelaw0103 physical sciencesMaterials ChemistryElectronic engineeringElectrical measurementsElectrical and Electronic EngineeringMemristor ReRAM electrical characterization system current compliance endurance retention0210 nano-technologybusinessSolid-State Electronics
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A General Mathematical Formulation for the Determination of Differential Leakage Factors in Electrical Machines with Symmetrical and Asymmetrical Ful…

2018

This paper presents a simple and general mathematical formulation for the determination of the differential leakage factor for both symmetrical and asymmetrical full and dead-coil windings of electrical machines. The method can be applied to all multiphase windings and considers Gorges polygons in conjunction with masses geometry in order to find an easy and affordable way to compute the differential leakage factor, avoiding the adoption of traditional methods that refer to the Ossanna's infinite series, which has to be obviously truncated under the bound of a predetermined accuracy. Moreover, the method described in this paper allows the easy determination of both the minimum and maximum v…

010302 applied physicsComputer scienceconcentrated winding020208 electrical & electronic engineering02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciTopology01 natural sciencesdifferential leakage factorIndustrial and Manufacturing EngineeringHarmonic analysismoment of inertiaControl and Systems EngineeringElectromagnetic coil0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringAsymmetrical windingdead-coil windingGörges polygonmultiphase windingsLeakage (electronics)
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Piecewise Affine (PWA) Modeling and Switched Damping Control of Two-Inertia Systems with Backlash

2018

Backlash degrades positioning accuracy and can induce mechanical wear and breakage by collisions. Therefore, a lot of studies have been conducted on backlash compensation. The simplest control method for the impact attenuation is torsional damping addition by feedback of torsional velocity. This paper reveals the advantages and disadvantages of the torsional damping addition. Based on the analyses, a novel switched damping control is proposed to realize the responses with smaller overshoot while attenuating the impact. The mechanical system and the proposed controller are described as piecewise affine systems for analyses. The performance of the proposed method is compared with a linear dam…

010302 applied physicsComputer sciencemedia_common.quotation_subjectAttenuation020208 electrical & electronic engineeringControl (management)02 engineering and technologyInertia01 natural sciencesCompensation (engineering)Mechanical systemControl theory0103 physical sciences0202 electrical engineering electronic engineering information engineeringOvershoot (signal)Backlashmedia_common
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Maximum Torque Per Ampere control algorithm for low saliency ratio interior permanent magnet synchronous motors

2017

This paper presents an investigation on the comparison between the Maximum Torque Per Ampere (MTPA) and the Field Orientation Control (FOC) algorithms for interior permanent magnet synchronous machines (IPMSMs). In particular, this study was carried out on a small-power IPMSM with low salience ratio. Both control algorithms have been implemented in the Matlab/Simulink environment, obtaining promising results.

010302 applied physicsControl algorithmMaximum torque per ampere control algorithmPermanent magnet synchronous motorComputer scienceRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringEnergy Engineering and Power Technology02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesField oriented control algorithmField orientationSalience (neuroscience)Control theoryMagnet0103 physical sciences0202 electrical engineering electronic engineering information engineeringInterior permanent magnet synchronous machineMATLABAmperecomputerMaximum torquecomputer.programming_language
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Pulsed Electro-Acoustic Method for specimens and cables employed in HVDC systems: Some feasibility considerations

2018

Recent experiments on the use of the PEA method for testing dielectric materials in specimens and comparison with a detailed model provide an insight of the phenomenon and suggest the need of adopting similar models also for cables. What is said is even more important considering the possible future adoption of the PEA methodology to test DC cables for Pre-Qualification and Type Tests. The use of an accurate model of the PEA cell used for testing specimens and related experiments prove that the thickness of the different parts composing the PEA setup is a basic element for providing accurate charge reading and interpretation of the phenomenon. Both simulation and experimental results, carri…

010302 applied physicsControl and OptimizationComputer science020209 energySample (material)Issues in PEA measurementMechanical engineeringEnergy Engineering and Power Technology02 engineering and technologyAcoustic wave01 natural sciencesSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/31 - ElettrotecnicaPulsed Electro-Acoustic methodComputer Networks and Communication0103 physical sciencesReflection phenomenon0202 electrical engineering electronic engineering information engineeringDC cableCharge accumulation
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Guest Editorial

2019

Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART²

010302 applied physicsControl and Systems Engineering0103 physical sciencesMaterials ChemistryCeramics and Composites02 engineering and technologyElectrical and Electronic Engineering021001 nanoscience & nanotechnology0210 nano-technologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsIntegrated Ferroelectrics
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