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Bucharest, Romania

Fodorean D.,Technical University of Cluj Napoca | Irimia C.,Siemens AG | Minciunescu P.,ICPE SA
Progress in Electromagnetics Research Symposium

The paper presents a study of a magnetic gear (MG) used for high speed applications (26000 r/min); its performances are numerically evaluated. Against common mechanical gears, for which the high trasmission ratio at high power is obtained only by linking several gears, the MG offers a better power density since just one unit can be used (even for high powers), and with acceptable levels of ripples in the torque wave. The paper investigates also the use of different magnet materials, other than the very expesive rear-earth ones, to evaluate the MG's performances. It is clear that the main loss source on a MG is the iron loss component, which is affecting directly its efficiency. Thus, the use a different core meterials will be considered for a final evaluation of the MG's operation to decide on the obtained performances: power density and efficiency. Source

Badea G.V.,ICPE SA
Green Energy and Technology

This introductory chapter will blend both legal and technical aspects of microgeneration systems in order to acquaint the readers with the concept and roles of microgeneration systems, the perception of the European Union and the ways of promotion and development through policies and legal instruments. These notions are fundamental for readers and practitioners in the field of microgeneration systems since a variety of factors work in close connection and have a profound influence on the development of microgeneration systems. This chapter will make short explanatory remarks about the evolution (1) of the European Union and the energy sector in Europe in the transition to decentralised energy production and extensive use of microgeneration systems. Afterwards, the challenges (2) confronting the European energy sector are presented in order to understand the way problems are tackled by the European Union through policies (3) and legal instruments (4) to comprehend the use, promotion and trend for development of microgeneration systems (5). © Springer-Verlag London 2015. Source

Stanculescu M.,Polytechnic University of Bucharest | Maricaru M.,Polytechnic University of Bucharest | Stefan-Minculete V.,Polytechnic University of Bucharest | Marinescu S.,ICPE SA | Hantila I.F.,Polytechnic University of Bucharest
Revue Roumaine des Sciences Techniques Serie Electrotechnique et Energetique

Time periodic EM fields in linear conducting media are usually determined by using time Fourier series of non-sinusoidal periodic waveforms. We present a method leading to a time periodic solution involving space eigenfunction expansion. For transient problems, the method leads to a very elegant form of the analytical solution. For time-periodic problems, if the space eigenfunctions can be easily determined, the method may be an interesting alternative to Fourier series decomposition, when the periodic excitation has a wide harmonic spectrum. The solution may be obtained as a product between a matrix depending only by the domain properties, and a matrix describing the coil current. These two approaches are complementary, the later one proving an accelerated convergence. An illustrative example concerning an aluminium cylindrical case for both sinusoidal and triangular waveform is included. Source

Onose B.-A.,ICPE SA
2016 11th International Conference on Ecological Vehicles and Renewable Energies, EVER 2016

This paper presents the objective of the Energy IN TIME (EiT) project of developing more advanced control method for existing non-residential buildings. This approach will be based on advanced building simulation models to reduce the energy consumption and energy bill. The project methodology will cover the most accurate and up to date international standards for energy efficiency. A simulation reference models will be developed with both forecasted and real time data type: external (climate, energy tariffs), internal data (status, equipment, occupancy) and user behavior data. A continuous commissioning strategy will be develop to better cope with the deviations between operational plans and real operation of the building, together with a fault detection and diagnostic system, designed for overall system robustness and evaluating faulty operation scenarios. The project goes beyond existing building control techniques by implementing a prediction system for indoor comfort conditions and used behavior performance to further improve energy efficiency and equipment lifetime. This approach will allow the reduction of system inefficiencies and therefore will contribute significantly to improve building end-user comfort. EiT will centralize the remote control of different buildings in an automatic process and validate the solution in four different locations in Europe, with different climate typologies. © 2016 IEEE. Source

Larin V.,MFTI Ltd | Panina L.V.,National University of Science and Technology "MISIS" | Patroi E.-A.,ICPE SA | Patroi D.,ICPE SA | And 2 more authors.
Physica Status Solidi (A) Applications and Materials Science

In this work, the directed crystallization of glass-coated magnetic microwires of Co-rich composition is realized with the aim to develop a novel technique for micro-magnet fabrication. The onset of the process is caused by local overheating above the primary crystallization temperature while the rest of the wire sample is at the temperature slightly below the crystallization temperature. This creates the conditions for spontaneous formation of microcrystallites at the wire edge and the movement of the crystal-amorphous interface along the wire. It was found that the directed crystallization is possible in a narrow temperature interval of 5-7near the crystallization temperature. The effect of the directed crystallization on the magnetic properties is evident from a giant increase in coercivity, up to 1000 times. The directed crystallization was also assisted by application of a magnetic field which resulted in greater increase in coercivity, up to 1500 times and the coercivity value reached 69400 A m-1. For comparison, at a standard crystallization the coercivity increases by 8-10 times being in the range of 2000-4000 A m-1. The developed micro-magnets can find a range of applications in miniature sensors, actuators, and manipulators. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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