Search results for "control."

showing 10 items of 13063 documents

Determination of differential leakage factors in electrical machines with non-symmetrical full and dead-coil windings

2017

In this paper Gorges polygons are used in conjunction with masses geometry to find an easy and affordable way to compute the differential leakage factor of non symmetrical full and dead coil winding. By following the traditional way, the use of the Ossanna's infinite series which has to be obviously truncated under the bound of a predetermined accuracy is mandatory. In the presented method no infinite series is instead required. An example is then shown and discussed to demonstrate practically the effectiveness of the proposed method.

010302 applied physicsConcentrated windingSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesDifferential leakage factorwindingsmoment of inertiaControl theoryElectromagnetic coil0103 physical sciencesunsymmetrical windingGörges polygonLeakage (electronics)Mathematics
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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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Experimental Equipment for Studying the Residual Stresses Developed During High Temperature Reactions by X-Ray Diffraction

1996

This paper describes a device dedicated to studyng, by X-ray diffraction the residual stresses developed on surface samples as a function of temperature and atmosphere conditions. The setup consists of : a.) an horizontal axis goniometer which allows the programmed positionning of the sealed X-ray source and of the linear detector. b.) a high temperature controlled atmosphere chamber Particular attention has been paid to the thermal stability up to 1200°C and the accurate position on the sample.

010302 applied physicsDiffractionControlled atmosphereChemistrybusiness.industryDetectorGeneral Physics and Astronomy02 engineering and technology021001 nanoscience & nanotechnology01 natural sciencesAtmosphereOpticsResidual stressGoniometer[PHYS.HIST]Physics [physics]/Physics archives0103 physical sciencesX-ray crystallographyThermal stability0210 nano-technologybusiness
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Effect of Cu doping on Ba0.95Pb0.05TiO3 electrical properties studied by means of electrical impedance spectroscopy

2019

The ceramics of 0.95BaTiO3–0.05PbTiO3+Xwt.%CuO (X = 0.05, 0.1, 1, 3) were prepared by a solid phase reaction. The structural and morphology studies were carried out by means of X-ray diffraction te...

010302 applied physicsDiffractionPhase reactionMaterials scienceMorphology (linguistics)Analytical chemistry02 engineering and technology021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesElectronic Optical and Magnetic MaterialsControl and Systems EngineeringCu dopingvisual_art0103 physical sciencesMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic Engineering0210 nano-technologyElectrical impedance spectroscopyIntegrated Ferroelectrics
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Investigation and reduction of losses on inverter-fed induction motors

2017

An electric motor is more effective and flexible when supplied by a frequency converter. The frequency converter not only produces the fundamental voltage but also a set of higher harmonics which cause additional losses in the motor. Losses in the frequency converter are normally neglected in the drive dimensioning due to insufficient data available from manufacturers. Motor's losses can be reduced by increasing the switching frequency of frequency converters. An increase of the switching frequency may result in higher losses in the frequency converter. This work investigates analytically and experimentally the dependence of the losses of modern motor and frequency converter on a switching …

010302 applied physicsElectric motorEngineeringbusiness.industry020208 electrical & electronic engineering02 engineering and technologyConverters01 natural sciencesPower (physics)Power ratingControl theoryHarmonics0103 physical sciences0202 electrical engineering electronic engineering information engineeringInverterbusinessInduction motorVoltage2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)
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Identification of induction motor thermal model for improved drivetrain design

2016

Selection of components of electric drivetrains is not only based on evaluating their ability to perform according to mechanical specifications, but — what is equally important — on assessing their thermal protection limits. These are typically affected by electrical and thermal properties of motors and drives. Although rated parameters (such as power, torque, speed, etc.) are easily accessible in catalogs of equipment producers, more specific properties like mass / length of copper winding, heat dissipation factor, rotor / stator dimensions etc. are not available to customers. Therefore, effective selection of drivetrain components is limited due to the lack of sufficient data and the need…

010302 applied physicsEngineeringStatorRotor (electric)business.industry020208 electrical & electronic engineeringDrivetrainControl engineering02 engineering and technology01 natural sciencesAutomotive engineeringlaw.inventionMotor driveDuty cyclelaw0103 physical sciences0202 electrical engineering electronic engineering information engineeringTorqueDesign processbusinessInduction motor2016 XXII International Conference on Electrical Machines (ICEM)
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A Magnetohydrodynamic Auxiliary Propulsion system for docking assistance of autonomous vehicle

2016

In this article we present an approach to the description of Magnetohydrodynamic Auxiliary Propulsion system for docking assistance of autonomous vehicle. Preliminarily, an analytical model which includes an electromagnetic model and a thermal model is presented. Successively, in order to move beyond the analytical model, a 3-D MHD modeling tool and a Runge Kutta method based solver are presented and they are used to investigate an alternative MHD solutions. Some numerical analysis are given

010302 applied physicsEngineeringbusiness.industryNumerical analysis05 social sciencesControl engineeringOcean EngineeringSolverPropulsionSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciOceanography01 natural sciencesRunge–Kutta methodsMagnetohydrodinamic Propulsion SystemSettore ING-INF/04 - AutomaticaPhysics::Space Physics0502 economics and business0103 physical sciencesMagnetohydrodynamic driveElectromagnetic modelMagnetohydrodynamicsThermal modelbusinessInstrumentation050203 business & management
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Sensorless control of induction motors using an extended Kalman filter and linear quadratic tracking

2017

Induction motors are the most commonly used prime-movers in industrial applications. Many induction motors supplied by frequency converters are coupled with a physical angular rotor position/velocity sensor which makes the drive complex and require maintenance. This paper presents a sensorless control structure to avoid using a physical angular rotor position/velocity sensor. The proposed method estimates and control the angular rotor velocity using optimal control theory. The optimal controller used in this paper is based on linear quadratic tracking and the states of the machine are estimated using an extended Kalman filter. Both the controller and the estimator utilize the same internal …

010302 applied physicsEngineeringbusiness.industryRotor (electric)Control engineering02 engineering and technologyConvertersOptimal control01 natural scienceslaw.inventionExtended Kalman filterControl theoryPosition (vector)law0103 physical sciences0202 electrical engineering electronic engineering information engineeringTorque020201 artificial intelligence & image processingbusinessInduction motor2017 20th International Conference on Electrical Machines and Systems (ICEMS)
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