The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 Intl Aegean Conference on Electrical Machines and Power Electronics (ACEMP)
The objective of this paper is to present an algorithm for processing infrared images and accomplishing automatic detection and path tracking of moving subjects with fever. The detection is based on two main features: the distinction between the geometry of a human face and other objects in the field of view of the camera and the temperature of the radiating object. These features are used for tracking...
The paper addresses the problem of image processing techniques used for conservation-restoration works from the Cultural Heritage. It compares the results of image processing obtained by using the histogram equalize and Retinex algorithms, by means of two metrics proposed by the International Commission of Illumination. The paper intends to stress some differences that exist between the uses of images...
The Bluetooth Low Energy technology has become more and more popular among wearable devices due to its low price and reduced power consumption. However, the development industry has oriented itself among mobile platforms neglecting the standard operating systems and providing only a limited set of integration possibilities most often using a smart-phone, restricting in this way the utility of such...
Predictive maintenance is a promising approach but upgrading existing machinery is expensive and difficult, thus replacing the machines is economically not worthwhile. A simple solution to upgrade existing machinery is required. With the proposed age estimation of electronic devices a first step towards such a system is taken. A test setup for accelerated aging of switched mode power supplies as well...
FPGAs are continuously increasing in both chip size and operating frequency. Dynamic reconfiguration is easier and more stable with current generation of hardware and software tools. These characteristics have made them more accessible to generic acceleration tasks instead of specialized functions. As a consequence, FPGAs are being deployed in more computing clusters than in the past. This leads to...
The microelectronic industry is driven by the continuous demand for processing capabilities and performance. As such, most processing is performed nowadays in a digital fashion. Analog however is not to be neglected. A key feature in modern mixed-signal processing is wide-range tuning of the analog processing sections. One step forward is the implementation of digitally programmable analog. The aim...
This treatise deals with Transistor Clamped Five Level Inverter using Non-Inverting Double Reference Single Carrier PWM (NIDRSC PWM) Technique. Conventional or two level inverter have drawbacks like: i) Requirement of fast switching devices, ii) Very high dv/dt, iii) High Electromagnetic Interferences (EMI), iv) Bulky filters, v) Faster heating of switches, and vi) Not suitable for high voltage applications...
The paper presents a microgrid structure, based on wind and photovoltaic (PV) renewable energies inputs, implemented in a dedicated configurable microgrid laboratory. The wind turbine is realized through a Hardware-in-the-Loop (HIL) emulator. PV energy can be taken from a set of panels or from a programmable DC source, which can implement the I–V characteristics of the real system. The microgrid configuration,...
In this article, the impact of different wind blade technologies on the levelized cost of energy of an offshore wind turbine is investigated. Blade technologies differ in material and fabrication processes, and this results in variations of the blade mass and cost. According to the blade technology, the blade mass can be characterized by an analytical function of the blade length. Results show a clear...
In this paper, an optimization of fuzzy logic controller (FLC) based maximum power point tracking (MPPT) using genetic algorithm (GA) is performed. The optimization process is performed by tuning the FLC's data base (DB) represented by parameters of membership functions (MFs) used. The tuning process is based on an objective function that is defined in terms of the statistic quantity named integral...
The main purpose of this paper is to perform a vibro-acoustic analysis in order to predict acoustic response by Computer-Aided Engineering (CAE) models related to a single phase permanent split capacitor motor noise. The radial magnetic force between stator and rotor is a main excitation source to create deformations of the stator housing, causing vibrations and acoustic noise. These forces are determined...
A new step-down dc-dc converter with one active switch and two diodes is presented. DC analysis is performed and static characteristics are derived, and then device stresses are evaluated and compared to other buck topologies. Design equations are provided, a prototype is simulated and finally experimentally tested. The measurements proved the feasibility of the proposed circuit. This novel converter...
Due to the high efficiency at the rated point and at partial load, the interest in synchronous reluctance machines grows steadily. A particular difficulty is the design of the flux barriers in the rotor. A simple approach to determine the shape of these barriers is to replicate the magnetic field lines in an isotropic rotor. For this purpose, a magnetostatic model is created and calculated analytically...
Large electrical machine has been extensively used in power plants and industries. The overhaul for large electrical machine is a costly process; also, unexpected stoppage of product line in factories due to fault leads to huge economical loss. Different methods have been so far proposed for fault diagnosis of large electrical machines. This paper provides comprehensive review of prevalent faults...
The paper analyses the performances of a three-phase synchronous generator with an inset neodymium-iron-boron permanent magnet rotor. This rotor structure produces an inverse saliency effect meaning the quadrature-axis reactance is greater than the direct-axis reactance. As a result of this effect, the generator presents itself a voltage compensation capability for maintaining almost constant output...
In this study, speedsensorless IM drive based on unscented Kalman filter (UKF) with the online estimations of stator stationary axis components of stator currents, rotor fluxes, rotor mechanical speed, load torque including the friction term, and stator resistance is designed. Therefore, the proposed speed-sensorless IM drive is robust to load torque and stator resistance changes. Different challenging...
This paper relates to the detection of the short-circuit faults in the stator winding of induction motors. Amplitudes of harmonics of the stator currents and of the magnetic field outside the motor are evaluated through the finite element analyses of the 3D electromagnetic field in time domain. In the perspective of early faults detection, the evolution of short-circuit faults based on changing of...
The energy losses depend on the mechanical stresses, induced in the cutting process. It is well known, that the electrical machine manufacturers want to minimize these effects and they choose to use high quality non-oriented electrical steel. The magnetic cores of the electrical machine are made, using mechanical cutting technology, because this method is simple, fast and cheap and the final cost...
Precise simulation of permanent magnet synchronous motors (PMSM) is the most important part in many cases particularly in their fault diagnosis and optimal control. This paper introduces different simulation methods of PMSM where finite elements method (FEM) is chosen as computation tools. The logic and problem solving is investigated and positive and negative points are described. Then, the trend...
Energy in the world is one of the priority issues and energy demand is rapidly increasing depending on the growing population and industry. The usable energy sources in the world are to be insufficient to meet the energy need. Therefore, the efficient and economical usage of energy sources is getting great importance. In a survey conducted among electric consuming machines, the electrical machines...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.