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Articoli di riviste sul tema "Electromagnetic losses"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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1

Gurova, Elena G. "Eddy Current Impact Estimation in Designing Vibroisolator with 3D Electromagnetic Stiffness Compensator". Applied Mechanics and Materials 792 (settembre 2015): 519–23. http://dx.doi.org/10.4028/www.scientific.net/amm.792.519.

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In this research the method of the calculation of the power losses in DC electromagnet through eddy currents, which are analog of the viscous friction, is presented. The influence of these currents on the operation of the vibroisolator with the electromagnetic stiffness compensator is estimated. The losses of the power on eddy currents are less than 1 per cent of the electromagnet power itself and the compensator totally. The example of the calculation of the losses for eddy currents in steel conductor is also shown.

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2

Matzui, Ludmila, Ludmila Vovchenko, Yuriy Prylutskyy, Igor Korotash, Volodymyr Matzui, Peter Eklund, Uwe Ritter e Peter Scharff. "Electromagnetic losses in carbon–epoxy composites". Materials Science and Engineering: C 27, n. 5-8 (settembre 2007): 1007–9. http://dx.doi.org/10.1016/j.msec.2006.06.017.

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3

Tsukerman, Igor. "Computational Electromagnetics: A Miscellany". J 4, n. 4 (15 dicembre 2021): 881–96. http://dx.doi.org/10.3390/j4040060.

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The paper presents a miscellany of unorthodox and, in some cases, paradoxical or controversial items related to computational and applied electromagnetics. The topics include a definition of the magnetic source field via a line integral, losses in electric power transmission vs. losses in photonics, homogenization of periodic electromagnetic structures, spurious modes, models of plasmonic media, and more. It is hoped that this assortment of subjects will be of interest to a broad audience of scientists and engineers.

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4

Deng, Xiong Fang, Ji Bo Hou, Lian Cheng e Ru Na Tian. "Research on Mechanism of Overland Flow Losses of Direct-Current Conduction Electromagnetic Pump for Casting". Applied Mechanics and Materials 401-403 (settembre 2013): 250–53. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.250.

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Compared with other factors, overland flow losses have stronger influence on the efficiency of direct-current conduction electromagnetic pump for casting. Mercury-media simulation of direct-current conduction electromagnetic pump is used. The mechanism of overland flow losses by changing the structure of liquid inlet was studied and got effective method of inhibiting overland flow losses. It can provide theoretical support for improving the efficiency of direct-current conduction electromagnetic pump.

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5

MATSUSHITA, Teruo. "Electromagnetic phenomena and hysteresis losses in superconductors." TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 24, n. 2 (1989): 83–92. http://dx.doi.org/10.2221/jcsj.24.83.

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6

Dupré, L., M. De Wulf, D. Makaveev, V. Permiakov, A. Pulnikov e J. Melkebeek. "Modelling of electromagnetic losses in asynchronous machines". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 22, n. 4 (dicembre 2003): 1051–65. http://dx.doi.org/10.1108/03321640310482995.

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7

Matsushita, T. "Electromagnetic phenomena and hysteresis losses in superconductors". Cryogenics 30, n. 4 (aprile 1990): 314–23. http://dx.doi.org/10.1016/0011-2275(90)90309-z.

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8

Hong, Kyung-Pyo, e Ju Lee. "Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump". Energies 17, n. 8 (16 aprile 2024): 1898. http://dx.doi.org/10.3390/en17081898.

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This paper presents a design study focusing on the thermal safety of an induction motor integrated with a pump unit, which operates submerged in liquefied natural gas (LNG) in the LNG tanks of LNG carrier ships ranging from 150 K to 200 K cubic meters (CBM). In this study, we carried out the electromagnetic design of the induction motor and verified the thermal safety against a temperature increase due to losses during the motor operation through thermal fluid analysis, taking into account the discharge flow of the emergency pump and the air gap of the motor. In the electromagnetic design, the resistivity of the stator winding copper conductors and the rotor aluminum bars, which act as important design constants for the rated operating and starting characteristics of the induction motor in cryogenic temperature environments, reflects the characteristic of linearly changing with the temperature. In cryogenic environments, the reduction in the resistance of the rotor bars of the induction motor leads to a decrease in the starting torque characteristics. Therefore, the shape optimization design of the rotor bar was performed to improve the starting torque characteristics, and 2D electromagnetic analysis was performed on the magnetic flux density distribution and magnetic saturation using Ansys Electromagnetics 16.0. After the electromagnetic design, a 3D thermal flow analysis was conducted using Ansys Fluent 17.0, considering the stator iron losses, rotor bar losses, stator and rotor iron losses, and stray load losses as heat sources. The flow analysis aimed to analytically verify the thermal safety concerning the vaporization of the LNG flowing through the emergency pump’s discharge flow path and the motor’s internal air gap. The motor was manufactured, and the rated and starting operating characteristics of the motor were measured under LN2 submerged conditions according to the IEEE 112 F1 method, to validate whether the performance characteristics met the specifications’ requirements. Subsequently, the thermal safety of the motor was finally verified through a temperature increase test under LNG submerged conditions after assembling it with the emergency pump.

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9

Nikitenko, Anatolii, Mykola Kostin, Tetiana Mishchenko e Oksana Hoholyuk. "Electrodynamics of Power Losses in the Devices of Inter-Substation Zones of AC Electric Traction Systems". Energies 15, n. 13 (22 giugno 2022): 4552. http://dx.doi.org/10.3390/en15134552.

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This article presents a new method for the estimation of active power losses based on a “field” approach, i.e., on the theory of the electromagnetic field and the theory of propagation of electromagnetic waves in a dielectric medium. Electromagnetic waves are assumed to transmit energy from the traction substation to electric rolling stock through the airspace of the inter-substation zone (i.e., not through the wires of the traction network) and meet electrically conductive surfaces on their way. The waves are partially reflected from the surfaces and partially penetrate them, thus creating thermal losses, the determination of which is the main task of this article. The analytical expressions for specific losses of active power are obtained by solving the system of Maxwell’s equations. Calculations of specific power losses in the catenary, rails, roofs, and bottoms of carriages and electric locomotives are performed. Power losses in carriages and electric locomotives are found to be at least 7%. A comparative assessment of the magnitude of total power losses of different types obtained by the “field” and “circuit” approaches is provided, which has established that “conditional” losses correspond to losses in rails, train carriages, and electric locomotives.

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10

Ren, X., R. Corcolle e L. Daniel. "Losses Approximation for Soft Magnetic Composites Based on a Homogenized Equivalent Conductivity". Advanced Electromagnetics 5, n. 2 (28 settembre 2016): 59. http://dx.doi.org/10.7716/aem.v5i2.391.

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Soft magnetic composites (SMC) are a promising alternative to laminated steel in many Electrical Engineering applications. This is largely owing to their low level of eddy current losses. The electromagnetic behavior of SMC in electromagnetic devices cannot be easily predicted using standard numerical techniques such as the finite element method, mostly due to the computational cost required to model the material microstructure. Another difficulty lies in the high property contrast between the matrix and the inclusions. In this paper we propose a homogenization strategy to define the equivalent electromagnetic properties of SMC. For components made of SMC, the equivalent conductivity and permeability can be determined. These equivalent properties can be used to calculate eddy current losses or introduced into structural analysis tools to design electromagnetic devices.

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11

Tounsi, Souhir. "Losses modelling of the electromagnetic and IGBTs converters". International Journal of Electric and Hybrid Vehicles 5, n. 1 (2013): 54. http://dx.doi.org/10.1504/ijehv.2013.053468.

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12

Refai, T. F., e A. G. Saif. "Electromagnetic Fields and Power Losses for Superconducting Slabs". physica status solidi (b) 166, n. 1 (1 luglio 1991): 201–7. http://dx.doi.org/10.1002/pssb.2221660122.

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13

SIMANJUNTAK, HERBERT P., e ANTO SULAKSONO. "ENERGY LOSSES OF SOLAR NEUTRINOS". Modern Physics Letters A 09, n. 24 (10 agosto 1994): 2179–88. http://dx.doi.org/10.1142/s0217732394002033.

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The energy losses of solar neutrinos are calculated for weak and electromagnetic interactions with electrons. The effects of neutrino mass and oscillations are included in the calculations and we use the full energy dependence of the stopping power of matter for the total losses of energy. The full energy dependence shows that the energy losses are too small to explain the solar neutrino problem even with the use of Majorana neutrinos or interactions with protons.

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14

Azmaiparashvili, Zaal, Nona Otkhozoria, Irakli Stepnadze e Tengiz Toriashvili. "Measurement of Resonant Frequency of Radio Frequency Converter under Conditions of Significant Electromagnetic Losses". International Journal on Applied Physics and Engineering 3 (23 luglio 2024): 22–27. http://dx.doi.org/10.37394/232030.2024.3.4.

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The measurement of resonant frequency in radio wave converter under conditions of high electromagnetic losses presents a formidable challenge. This frequency serves as a crucial parameter directly linked to non-electronic quantities, such as spatial separation thresholds or substance consumption levels. Consequently, accurate measurement of these non-electric variables necessitates precise determination of the transmitter's resonant frequency. However, when electromagnetic losses escalate due to control environment properties, achieving such precision becomes daunting. Common methodologies often hinge on assessing resonant frequency via the transmitter's amplitude-frequency characteristic. However, conventional approaches, typically reliant on electron beam tubes with intricate control mechanisms, falter in accuracy amidst substantial electromagnetic transmission losses. This inadequacy undermines the efficacy of current devices. This paper introduces an unconventional method for resonance frequency measurement and underscores the benefits of the device developed through this novel approach compared to existing ones. The proposed method ensures sustained high measurement accuracy even in the face of significant transmitter electromagnetic losses. Central to this method is the measurement of frequencies ω₁ and ω₂ proximate to the resonant circuit's extreme value at points characterized by identical transmission coefficients. Resonant frequency is then determined as the half-sum of these frequencies during symmetrical frequency modulation. This innovative approach promises to overcome the limitations of traditional resonance frequency measurement methods, offering enhanced precision and reliability in challenging electromagnetic environments.

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15

Craven, R. M., I. R. Smith e B. M. Novac. "Electromagnetic Radiation from a Tesla Transformer". Applied Physics Research 9, n. 2 (17 marzo 2017): 53. http://dx.doi.org/10.5539/apr.v9n2p53.

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In addition to the resistive and dielectric losses that inevitably occur near the secondary winding of a Tesla transformer, electromagnetic radiation into the far field also contributes to the overall power losses and thereby reduces both the effective quality factor (Q) and the power transfer efficiency of this winding. A short study of these effects for a laboratory scale transformer has shown that, in addition to its Q-factor being considerably reduced, the secondary winding is an extremely inefficient radiator of electromagnetic energy.

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16

Patecki, Andrzej, Sławomir Stępień e Grzegorz Szymański. "Power losses analysis in the windings of electromagnetic gear". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 23, n. 3 (settembre 2004): 748–57. http://dx.doi.org/10.1108/03321640410540683.

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17

Ko, Kyoung-Jin, Seok-Myeong Jang e Jang-Young Choi. "Performance Evaluation of Small-Scaled Wind Power Generator with Outer Permanent Magnet Rotor considering Electromagnetic Losses (2) - Electromagnetic Losses and Performance Analysis -". Transactions of The Korean Institute of Electrical Engineers 60, n. 1 (1 gennaio 2011): 50–62. http://dx.doi.org/10.5370/kiee.2011.60.1.050.

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18

Kotsur, M. І., Yu S. Bezverkhnia, D. S. Yarymbash e І. М. Kotsur. "Peculiarities of overhead crane movement mechanism operation when powered by a basbar's trolley at action of higher current harmonics". Electrical Engineering and Power Engineering, n. 2 (30 giugno 2022): 18–29. http://dx.doi.org/10.15588/1607-6761-2022-2-2.

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Purpose. Analysis and research of interconnected electromagnetic processes between electric drives of overhead crane moving mechanism and trolleys under conditions of higher current harmonics, taking into account design features, nonlinearity of magnetic and electrophysical properties of materials, proximity effects, surface and external surface effects. Methodology. The research was carried out using methods of electromagnetic field theory, electrical circuit theory, mathematical physics, solving a system of first order differential equations, interpolation, approximation and regression analysis. Findings. A simulating model of interrelated electromagnetic processes between electric drives of an overhead crane mechanism and current-conducting elements of the power supply system of an overhead crane has been developed. Investigations of electromagnetic processes between the electric drives of the overhead crane mechanisms and the trolleys have been carried out. The laws of voltage losses in the busbar's trolleys from the torque of the asynchronous electric drive have been established. This allowed to determine the maximum permissible distance of overhead crane movement to the feeding point of the busbar's trolley section, at which trouble-free operation is ensured as well as to determine the number of feeding points of the busbar's trolley sections and the distance between them. This will ensure the same level of voltage losses and active losses in the trolleys at the fundamental harmonic, and taking into account the higher harmonics of the load current. Originality. .A simulating model of interrelated electromagnetic processes between electric drives of an overhead crane mechanism and current-conducting elements of the power supply system of an overhead crane has been developed. which allows to use integrated parameters of busbar trolleys according to field calculation taking into account skin effect, the shape and location of tires (trolleys) in the busbar, the distances between them and the number of phases of the busbar, depending on the peculiarities of the modes of operation of the electric drive and the distance of the bridge crane to the power point of busbar trolley sections Practical value. Based on the theoretical research, recommendations to reduce voltage losses and active losses in the trolley from the action of higher harmonic loads to the level of voltage losses and active losses at the fundamental harmonic current have been developed.

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19

Um, Dae Yong, e Gwan Soo Park. "Comparison of Electromagnetic Characteristics of Single-Phase Induction Motor between Balanced and Unbalanced Operation under Different Loads". Energies 14, n. 4 (9 febbraio 2021): 919. http://dx.doi.org/10.3390/en14040919.

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This paper varies load conditions in a single-phase induction motor and deals with consequent effects on the electromagnetic characteristics in terms of a balanced and unbalanced operation. Based on a balanced-load condition, the magnetic field, electromagnetic losses, magnetic torque are quantified by the time-stepping finite element method at six different loads. The spatial distribution of the air-gap magnetic field are investigated to characterize the existence between the load variation and unbalanced operation. The components of electromagnetic losses are analyzed in terms of main parameters degrading the operating efficiency according to the load variation. The result can show the importance of building the magnetic balance for a high performance, and the design guideline for SPIMs running at multiple operating points is discussed.

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20

Ashraf Balametov, Ashraf Balametov, e Tarana Isaeva Tarana Isaeva. "SOFTWARE FOR MONITORING AC CORONA EFFECTS OF OVERHEAD LINES". PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 20, n. 09 (14 settembre 2022): 04–14. http://dx.doi.org/10.36962/pahtei20092022-04.

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The issues of environmental impact of high-voltage transmission lines are becoming relevant in connection with the development of electrical networks of high voltage 110, 220, 330 kV, extra-high voltage (EHV) 500-750 kV and ultra-high voltage 1150 kV. The harmful effect of electric and magnetic fields on living organisms and, first of all, on humans, manifests itself only at very high voltages in the wires of the overhead line (OH) phases, and is dangerous when working under voltage. The direct influence of the electromagnetic field of lines on a person is associated with an effect on the cardiovascular, central nervous systems and other organs. The harmful effects of a person's stay in a strong electric field depend on the strength of the field and on the duration of its exposure. Software has been developed for modeling electromagnetic compatibility, characteristics of power losses to the corona from the voltage impact on the environment. The results of simulation of corona losses are presented on the example of a 500 kV overhead line, electric field voltage and active energy losses due to radio interference. Keywords: environmental impact, overhead power lines, electric field strength, corona losses, radio interference, acoustic noise, electromagnetic compatibility

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21

Cheng, Hsien-Chie, Yan-Cheng Liu, Wen-You Jhu, Po-Kai Chiu, Tao-Chih Chang e Kuo-Ning Chiang. "Power Loss and Electrothermal Characterization of Hybrid Power Integrated Modules for Industrial Servo Motor Drives". Energies 17, n. 23 (30 novembre 2024): 6036. https://doi.org/10.3390/en17236036.

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This study aims to facilitate the assessment of the electromagnetic-electrical-thermal coupled response of a developed 30 kHz/12 kW silicon carbide (SiC)/silicon (Si) hybrid power-integrated module (hPIM) during load operation. To achieve this goal, an efficient electromagnetic-circuit-thermal coupling (ECTC) analysis methodology is introduced. This ECTC methodology incorporates a fully integrated electromagnetic-circuit coupling (EMCC) analysis model for parasitic extraction in order to addressing their effects on power losses, and a simplified electrothermal coupling (SETC) analysis model for temperature evaluation in order to consider the coupling influence of the instantaneous junction temperature on instantaneous power losses. The SETC model couples a simple lookup table that maps the power loss (P) in terms of the temperature (T) constructed using the developed EMCC model, and an equivalent Foster thermal network model established through three-dimensional (3D) computational fluid dynamics (CFD) thermal flow analysis. This PT lookup table, replacing the tedious and time-consuming EMCC simulation, is responsible for fast estimation of temperature-dependent power losses. The proposed analysis models, namely the CFD, EMCC, and SETC analysis models, are validated through thermal experiments and detailed modeling. Finally, the influence of various operation conditions on the power losses of the hPIM during the power conversion operation is explored through parametric analysis.

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Vatamanu, D., e S. Miclaus. "Magnetite Particle Presence in the Human Brain: A Computational Dosimetric Study to Emphasize the Need of a Complete Assessment of the Electromagnetic Power Deposition at 3.5 GHz". Engineering, Technology & Applied Science Research 11, n. 5 (12 ottobre 2021): 7720–29. http://dx.doi.org/10.48084/etasr.4466.

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The growing evidence of increased magnetite nanoparticles (both endo- and exo-genic) in the human brain raises the importance of assessing the entire power deposition when electromagnetic waves at GHz frequencies propagate in such tissues. This frequency range corresponds to many popular portable communication devices that emit radiation close to a human's head. At these frequencies, the current dosimetric numerical codes can not accurately compute the magnetic losses part. This is due to the lack of an implemented computational algorithm based on solving the coupled Maxwell and Landau-Lifshitz-Gilbert equations, in the case of magneto-dielectrics, considering eddy currents losses and specific properties of magnetic sub-millimetric particles. This paper focuses on analyzing the limits and the inconsistencies when using commercial dosimetric numerical software to analyze the total absorbed power in brain models having ferrimagnetic content and being exposed to 3.5GHz electromagnetic waves. Magnetic losses computed using Polder’s permeability tensor as constitutive relation lead to unreliable results. However, using such software can provide a preliminary view of the electromagnetic impact of ultra- and super-high frequencies on magnetic-dielectric tissues.

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23

Kostin, Mykola. "Electrodynamics of electric power transmission and losses in devices of electric transport systems". MATEC Web of Conferences 180 (2018): 01003. http://dx.doi.org/10.1051/matecconf/201818001003.

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For the first time, the “field” approach for explaining the processes of transmission and generation of electric power losses in devices of electric transport systems is described and theoretically substantiated on the basis of the theory of electromagnetic field. The results of the solution of the system of electromagnetic field equations show that it is energetically appropriate to design low-floor types of electric rolling stock. A qualitative view of electric power flows arriving through the air of the feeder zone from the traction substation and entering to the electric rolling stock through the roof and the front part of its body is presented. It is established that the main flow of energy enters through the roof porcelain insulator. At the same time, the electromagnetic waves partly penetrate into the metal surfaces of roof and frontal part of the body, and partially they are reflected from them creating losses of active power. The results of calculations of these losses, power factor and reactive power factor of the electric locomotive roof are shown. The relation between the standing waves, formed in the feeder zone, and the reactive power consumed by the electric rolling stock is established.

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Song, Zhan Hai, Yi Fang Wang, Shuai Mou, Zhe Wu, Yin Hui Zhu, Bing Fu Xiang e Ce Zhou. "Stray Losses Study for a Power Transformer Based on 3D FEM". Applied Mechanics and Materials 130-134 (ottobre 2011): 3374–76. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3374.

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Base on three dimension (3D) finite element method (FEM), a electromagnetic model for a power distribution transformer is established. The core loss, stray losses in structural components are simulated, the effects of magnetic shunts on tank losses are studied, then compared with experiments. The core loss, the decrease of stray losses when using magnetic shunts are in accordance with experiments. Studies indicate that tank loss is the most impartment part of stray losses in this model, magnetic shunts are effective in reducing stray losses.

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Sergeant, Peter, e Selim Koroglu. "ELECTROMAGNETIC LOSSES IN MAGNETIC SHIELDS FOR BURIED HIGH VOLTAGE CABLES". Progress In Electromagnetics Research 115 (2011): 441–60. http://dx.doi.org/10.2528/pier11022206.

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Fisanov, V. V. "Normal Waves in an Electromagnetic Metachiral Isotropic Medium with Losses". Russian Physics Journal 63, n. 9 (gennaio 2021): 1490–96. http://dx.doi.org/10.1007/s11182-021-02196-7.

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Fisanov, V. V. "Normal waves in the electromagnetic metachiral isotropic medium with losses". Izvestiya vysshikh uchebnykh zavedenii. Fizika, n. 9 (2020): 38–43. http://dx.doi.org/10.17223/00213411/63/9/38.

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Plane electromagnetic waves in an isotropic absorbing chiral medium (chiral metamaterial) are considered. A system of constitutive Drude - Born - Fedorov relations with complex values of the dielectric permittivity, magnetic permeability, and the chirality parameter is used. A distinction is made between forward and backward normal waves by introducing a special parameter - the wave type identifier. Analytical expressions for real and imaginary parts of wave numbers of homogeneous normal waves are presented.

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Gupta, Namit. "Fault detection using electromagnetic time reversal: The problem of losses". Asian Journal of Multidimensional Research 10, n. 10 (2021): 898–903. http://dx.doi.org/10.5958/2278-4853.2021.00954.x.

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Neyman, L. A., V. Yu Neyman e V. A. Elanakova. "Dynamic model of the electromagnetic oscillating system with energy losses". Journal of Physics: Conference Series 1333 (ottobre 2019): 052022. http://dx.doi.org/10.1088/1742-6596/1333/5/052022.

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Wenbin Ma, Zhilong Hou, Zhiyong Liu, Feipeng Ning, Guoqing Zhang e Zian Zhu. "AC Losses Analysis and Experiments of Superconducting Electromagnetic Iron Separator". IEEE Transactions on Applied Superconductivity 22, n. 3 (giugno 2012): 9002304. http://dx.doi.org/10.1109/tasc.2011.2178110.

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Guan, P. F., X. F. Zhang e J. J. Guo. "Assembled Fe3O4 nanoparticles on graphene for enhanced electromagnetic wave losses". Applied Physics Letters 101, n. 15 (8 ottobre 2012): 153108. http://dx.doi.org/10.1063/1.4758931.

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Ossart, F., L. Hirsinger e R. Billardon. "Computation of electromagnetic losses including stress dependence of magnetic hysteresis". Journal of Magnetism and Magnetic Materials 196-197 (maggio 1999): 924–26. http://dx.doi.org/10.1016/s0304-8853(98)00990-1.

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Gies, Soeren, e A. Erman Tekkaya. "Analytical prediction of Joule heat losses in electromagnetic forming coils". Journal of Materials Processing Technology 246 (agosto 2017): 102–15. http://dx.doi.org/10.1016/j.jmatprotec.2017.03.008.

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Niewierowicz, Tadeusz, Leszek Kawecki e Ewa Napieralska. "Determination of Electromagnetic Losses in Electric Motors Applying Neural Networks". IEEE Latin America Transactions 9, n. 5 (settembre 2011): 747–52. http://dx.doi.org/10.1109/tla.2011.6030985.

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Dupré, L. R., R. Van Keer e J. A. A. Melkebeek. "On a mathematical model for electromagnetic losses in electric machinery". Mathematical Modelling of Systems 1, n. 1 (gennaio 1995): 63–74. http://dx.doi.org/10.1080/13873959508837007.

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Mayergoyz, I., e C. Serpico. "Nonlinear diffusion of electromagnetic fields and excess eddy current losses". Journal of Applied Physics 85, n. 8 (15 aprile 1999): 4910–12. http://dx.doi.org/10.1063/1.369139.

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Soskic, Zlatan, Jelena Tomić, Nebojša Bogojević e Snežana Ćirić Kostić. "Influence of Heavy Data Transmission Losses on Spectra of Signals". Applied Mechanics and Materials 430 (settembre 2013): 125–34. http://dx.doi.org/10.4028/www.scientific.net/amm.430.125.

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Measurements of machine vibrations are often influenced by heavy data losses during wireless transmission of signals, which arise because of electromagnetic interference of electric motors. In this paper, authors present an analytic calculation of distortions introduced in spectra of harmonic signals by heavy data transmission losses, which are characterized by the loss ratio and frequency of losses. The results may be used to reduce errors that arise during spectral analysis of signals in conditions of heavy spectral losses.

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Cui, Hong, e You Qing Gao. "Research on the Influence of Harmonics on High-Speed Permanent Magnet Motor". Advanced Materials Research 690-693 (maggio 2013): 3275–78. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.3275.

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The influence of current harmonics on high-speed permanent magnet motor is analyzed in this paper. The several aspects influence of current harmonics are analyzed in detail such as on the stator core losses, copper losses, as well as additional losses, the rotor losses, the electromagnetic torque etc. The necessity of suppressing current harmonics for high-speed motor stable and reliable running and the key issues of high-speed motor control system stable operation is stated.

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Yan, Wei-Mon, Hsu-Yang Teng, Chun-Han Li e Mohammad Ghalambaz. "Electromagnetic field analysis and cooling system design for high power switched reluctance motor". International Journal of Numerical Methods for Heat & Fluid Flow 29, n. 5 (7 maggio 2019): 1756–85. http://dx.doi.org/10.1108/hff-08-2018-0450.

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Purpose The electromagnetic field and cooling system of a high power switched reluctance motor (SRM) are studied numerically. The geometry of the motor and its main components are established using a computer-aided design software in the actual size. This study aims to evaluate the resulting thermal losses using the electromagnetic analysis of the motor. Design/methodology/approach In the electromagnetic analysis, the Joule’s loss in the copper wires of the coil windings and the iron losses (the eddy currents loss and the hysteresis loss) are considered. The flow and heat transfer model for the thermal analysis of the motor including the conduction in solid parts and convection in the fluid part is introduced. The magnetic losses are imported into the thermal analysis model in the form of internal heat generation in motor components. Several cooling system approaches were introduced, such as natural convection cooling, natural convection cooling with various types of fins over the motor casing, forced conviction air-cooled cooling system using a mounted fan, casing surface with and without heat sinks, liquid-cooled cooling system using the water in a channel shell and a hybrid air-cooled and liquid-cooled cooling system. Findings The results of the electromagnetics analysis show that the low rotational speed of the motor induces higher currents in coil windings, which in turn, it causes higher copper losses in SRM coil windings. For higher rotational speed of SRM, the core loss is higher than the copper loss is in SRM due to the higher frequency. An air-cooled cooling system is used for cooling of SRM. The results reveal when the rotational speed is at 4,000 rpm, the coil loss would be at the maximum value. Therefore, the coil temperature is about 197.9°C, which is higher than the tolerated standard temperature insulation material. Hence, the air-cooled system cannot reduce the temperature to the safe temperature limitation of the motor and guarantee the safe operation of SRM. Thus, a hybrid system of both air-cooled and liquid-cooled cooling system with mounting fins at the outer surface of the casing is proposed. The hybrid system with the liquid flow of Re = 1,500 provides a cooling power capable of safe operation of the motor at 117.2°C, which is adequate for standard insulation material grade E. Originality/value The electromagnetic field and cooling system of a high power SRM in the presence of a mounted fan at the rear of the motor are analyzed. The thermal analysis is performed for both of the air-cooled and liquid-cooled cooling systems to meet the cooling demands of the motor for the first time.

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Lu, Ping, Wei He, Li Feng Ma e Ruo Yan Han. "Lightning Electromagnetic Field within the Building". Advanced Materials Research 971-973 (giugno 2014): 1025–28. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1025.

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Because of the fast development of high buildings and large mansions and the increasing applications of electronic information technology, all kinds of advanced electronic equipments are installed in buildings. These equipments have qualities of low insulation, weak endurance of overvoltage and overcurrent and sensitivity for EMC disturb. Then more and more serious hazards and indirect economic losses are arising from lightning disturbance. Therefore, in order to cut down such big losses it is really necessary to conduct the research of stroke-incidence rules and take effective measures to protect buildings against lightning. Theories and practice show that the lightning protection is a systematic engineering. The exterior protection and interior protection should be constituted as an integer. This paper mainly studies the telecommunication equipments in the building disturbed and harmed by the lightning electromagnetic field. To protect this injure effectively we must find out the distributions of the lightning electromagnetic field in the building. Three cases of the lightning electromagnetic field distributions in the building have been discussed in the paper.

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Tao, Dajun, Kai Liang Zhou, Fei Lv, Qingpeng Dou, Jianxiao Wu, Yutian Sun e Jibin Zou. "Magnetic Field Characteristics and Stator Core Losses of High-Speed Permanent Magnet Synchronous Motors". Energies 13, n. 3 (22 gennaio 2020): 535. http://dx.doi.org/10.3390/en13030535.

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This study focuses on the core losses in the stator region of high-speed permanent magnet synchronous motors, magnetic field characteristics in the load region, and variations in iron losses caused by changes in these areas. A two-pole 120 kW high-speed permanent magnet synchronous motor is used as the object of study, and a two-dimensional transient electromagnetic field-variable load circuit combined calculation model is established. Based on electromagnetic field theory, the electromagnetic field of the high-speed permanent magnet synchronous motor under multi-load conditions is calculated using the time-stepping finite element method. The magnetic field distribution of the high-speed permanent magnet synchronous motor under a multi-load condition is obtained, and the variations in iron core losses in different parts of the motor under multi-load conditions are further analyzed. The calculation results show that most of the stator iron core losses are dissipated in the stator yoke. The stator yoke iron loss under the no-load condition exceeds 70% of the total stator iron core loss. The stator yoke iron loss under rated operation conditions exceeds 50% of the total stator iron core loss. The stator loss under rated load operation conditions is higher than that under no-load operation. These observations are sufficient to demonstrate that the running status of high-speed motors is closely related to the stator iron losses, which have significance in determining the reasonable yoke structure of high-speed and high-power motors and the cooling methods of motor stators.

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42

Chiarello, Eduardo, e Juliana Almansa Malagoli. "Optimal Coil Design of an Electromagnetic Actuator Using Particle Swarm Optimization". Journal Européen des Systèmes Automatisés 53, n. 6 (23 dicembre 2020): 755–61. http://dx.doi.org/10.18280/jesa.530601.

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This paper aims to reduce the heating of the electromagnetic actuators of a magnetic bearing. The electrical current of the coils was above normal, so the need for a new coil design to reduce heating due to high currents. In this scenario, the proposed methodology allows minimizing copper losses using Particle Swarm Optimization, so that the best result of the design parameters will be used in the construction of the new coil for the actuator. For the development of this work, it was decided to use a computational tool for public use, FEMM (Finite Element Method Magnetics) to simulate the electromagnetic device. In the simulations, the densities of magnetic fluxes in the core and in the air gap are shown, as well as the energies, electromagnetic forces and losses in the copper of the electromagnetic actuator winding. Finally, an optimal model of the actuator is obtained through the use of optimization techniques. Therefore, the results obtained demonstrate that the proposed methodology is configured as an interesting strategy for the purpose of this work.

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Boumous, Samira, Nacereddine Guettaf, Amina Hamel, Ilham Lariche e Hamou Nouri. "Effect on Human Body of the Magnetic Field Induced by the High Voltage Transmission Line". European Journal of Electrical Engineering 23, n. 2 (23 aprile 2021): 149–55. http://dx.doi.org/10.18280/ejee.230209.

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The quality of electrical energy and the fight against energy losses are a crucial issue for electricity companies. The use of high voltage lines can limit energy losses for the transmission of electricity over long distances. But this solution has the disadvantage of the propagation of the electromagnetic wave which has a great influence on human health. The work presented in this study mainly deals with modelling problems that may be encountered by the community working in the field of low frequency electromagnetic fields. In order to model a power line, we are based on geometric data as well as phase and earth conductor data.

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Bukhanko, A. F. "Effects of losses on the transmission and reflection of electromagnetic waves at the interface of metamaterial with zero real part of permittivity". Low Temperature Physics 49, n. 10 (1 ottobre 2023): 1170–77. http://dx.doi.org/10.1063/10.0020871.

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Electromagnetic wave refraction and reflection at the interface between vacuum and lossy metamaterial with zero real part of permittivity are analytically described by macroscopic classical electrodynamics. The analytical model is based on exact solutions of electromagnetic boundary problems. We have good reason to believe that in lossy metamaterial with zero real part of permittivity, the values of the magnetic field and energy flow are nonzero due to the crucial role of losses in epsilon-near-zero metamaterials. It is shown that the significant transmission of waves occurs for almost all incident angles. Moreover, the transmission coefficient increases with increasing loss for TE and TM wave polarizations. Numerical results are presented to show that the optical characteristics of waves at the interface of the metamaterial are highly sensitive to the losses and polarization of waves. The effect of the losses is most pronounced for transverse electric waves. The main contribution of this article is the characterization of the role of losses in the optical properties of epsilon-near-zero metamaterials that differs from some analogs known in the literature.

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Bogachkov, I. V. "Researches of the electrodynamic characteristics of oily substances in the microwave range". T-Comm 18, n. 7 (2024): 64–70. https://doi.org/10.36724/2072-8735-2024-18-7-64-70.

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Results of researches of the electromagnetic properties of oil substances in the microwave frequency band are presented in this work. Possibilities of using microwave heating in oil industry and pumping of oil products are considered. The possibility of using microwave heating to solve a number of problems of oil production and pumping oil through pipelines is being researched. Using waves in the microwave range allows in many cases to concentrate the heat release in the most viscous paraffin and bitumen components, which as a result reduces the viscosity of these components. To determine optimal wave frequencies and powers used for heating, it is necessary to know the electromagnetic characteristics of oil-containing mixtures. Experimental researches consisted in measuring the attenuation of electromagnetic waves passing through a "clean" section of the waveguide and through the same section of the waveguide after passing petroleum products of various compositions through it. The additional attenuation of oil pollutions in the frequency band 9-11 GHz does not exceed 0.27 dB/m. To determine the electromagnetic properties of oil-containing materials in the microwave band, experimental researches were conducted on the coaxial segment, which is filled with the researching substance. Losses in conductors are dominated by losses in contact connections. The wave penetration depth in the substance decreases with an increase in frequency, which must be taken into account in the heating technology. Parameters of researching substances were calculated, and their frequency dependences are presented. The losses in oil deposits significantly exceed losses in pure oil, therefore these deposits will heat up more, than pure oil. This effect can be used to reduce the viscosity of oil both in oil pipelines during oil transportation and in the production of high viscosity oil. It is possible to determine the required heating power and time to use microwave heating technology for the oil industry.

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Aziz, R., G. J. Atkinson e S. Salimin. "Thermal Modelling for Permanent Magnet Synchronous Machine (PMSM)". International Journal of Power Electronics and Drive Systems (IJPEDS) 8, n. 4 (1 dicembre 2017): 1903. http://dx.doi.org/10.11591/ijpeds.v8.i4.pp1903-1912.

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<span>It is important to predict the temperature in some of the essential parts in machine design to prevent the machine from any damage. Most researchers usually not given much attention on thermal analysis during machine design as much as the electromagnet design. Therefore, in this study, two types of thermal modelling were proposed to predict the temperature of a permanent magnet synchronous machine (PMSM). Infolytica ThermNet software has been used since the software is related to Infolytica Magnet and the losses obtained from the electromagnetic field analysis are used as the heat source in the thermal analysis. Comparison has been done between the predicted temperature from lumped parameter model and finite element analysis. The results also will be validated by using experimental setup. Since Infolytica Magnet has been used to analyse the electromagnetic output therefore finite element analysis model is the better choice.</span>

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Wang, Haicheng, Zhiran Yan, Jing An, Jun He, Yanglong Hou, Hongying Yu, Ning Ma, Guanghua Yu e Dongbai Sun. "Iron cobalt/polypyrrole nanoplates with tunable broadband electromagnetic wave absorption". RSC Advances 6, n. 95 (2016): 92152–58. http://dx.doi.org/10.1039/c6ra16003d.

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48

Plait, Antony, e Frédéric Dubas. "Volumic Eddy-Current Losses in Conductive Massive Parts with Experimental Validations". Energies 15, n. 24 (12 dicembre 2022): 9413. http://dx.doi.org/10.3390/en15249413.

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In this paper, the analytical determination of volumic eddy-current losses in rectangular-shaped conductive massive parts is presented with experimental validations. Eddy currents, as well as the resulting volumic losses, are generated by a sinusoidal spatially uniform applied magnetic field. A U-shaped electromagnetic device with a flat mobile armature (or adjustable air gap) is used to measure the eddy-current losses. The experimental device, its instrumentation, and the conductive massive parts are presented in detail in the paper. Thereafter, the magnetic field distribution applied on the conductive massive parts, which is the mean input data for the eddy-current loss model, is studied. A two-dimensional (2D) numerical model, under the FEMM software, for the magnetic field calculation was also developed. A comparative analysis between the experimental measurements and the numerical results allowed the distribution of the applied magnetic field to be accurately validated. In the final phase, the objective was to estimate the volumic eddy-current losses in rectangular-shaped aluminium conductive massive parts generated by the variation of this applied magnetic field. An analytical model, based on the Maxwell–Fourier method, for the accurate prediction of eddy-current losses has also been developed. An electromagnet with and without the conductive massive parts is characterized in terms of power consumption. By using the power conservation method (i.e., Boucherot’s theorem), the eddy-current losses could be quantified experimentally. The influence of segmentation is also studied. The analytical results are compared to the experimental test results.

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Goryslavets, Yu M., O. I. Gluhenky e V. I. Zalozny. "MODELING OF ELECTROMAGNETIC PROCESSES IN INDUCTION CHANNEL FURNACES TAKING INTO ACCOUNT METAL FRAMES". Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2023, n. 64 (8 maggio 2022): 64–69. http://dx.doi.org/10.15407/publishing2023.64.064.

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On the basis of the formulated mathematical model for the study of electromagnetic processes in a two-phase (two-inductor) induction channel furnace, electrical losses in the metal frameworks of the furnace were calculated for vari-ous options for their sectioning. The influence of the phase angle between the voltages feeding the inductors of the fur-nace on the distribution of specific and integral losses in the frames is determined. Practical recommendations for re-ducing these losses in order to increase the efficiency of melting furnaces are presented. Ref. 5, fig. 5.

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Hayakawa, Masashi, e Hiroyuki Yamauchi. "Unusual Animal Behavior as a Possible Candidate of Earthquake Prediction". Applied Sciences 14, n. 10 (20 maggio 2024): 4317. http://dx.doi.org/10.3390/app14104317.

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Short-term (with a lead time of about one week) earthquake (EQ) prediction is one of the most challenging subjects in geoscience and applied science; however, it is highly required by society because it is of essential importance in mitigating the human and economic losses associated with EQs. Electromagnetic precursors have recently been agreed to be the most powerful candidate for short-term prediction, because a lot of evidence has been accumulated on the presence of electromagnetic precursors (not only from the lithosphere, but also from the atmosphere and ionosphere) prior to EQs during the last three decades. On the other hand, unusual animal behavior associated with EQs, which is the main topic of this review, has been investigated as a macroscopic phenomenon for many years, with a much longer history than the study of seismo-electromagnetics. So, in this paper, we first summarize the previous research work on this general unusual animal behavior with reference to its relationship with EQs, and then we pay the greatest attention to our own previous work on dairy cows’ milk yield changes. We recommend this unusual animal behavior as an additional potential tool for short-term EQ prediction, which may be a supplement to the above seismo-electromagnetic effects. Finally, we will present our latest case study (as an example) on unusual changes of cows’ milk yields for a particular recent Tokyo EQ on 7 October 2021, and further propose that electromagnetic effects might be a possible sensory mechanism of unusual animal behavior, suggesting a close link between electromagnetic effects and unusual animal behavior.

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