Journal articles: 'Field circuit coupling'

1

Xu, Zhenfa, Fanyu Kong, Kun Zhang, Yinfeng Wang, Jiaqiong Wang, and Ning Qiu. "Internal Flow Field and Loss Analysis of a Magnetic Drive Pump’s Cooling Circuit." Energies 16, no. 2 (January 11, 2023): 840. http://dx.doi.org/10.3390/en16020840.

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The cooling circuit is an important component of the magnetic drive pump because it prevents demagnetization of the permanent magnet and damage to the containment shell owing to a high temperature increase. In this paper, the flow field and losses of the cooling circuit of the magnetic pump are discussed and experimentally verified based on numerical simulation methods. Five different lengths of magnetic couplings were designed, and the flow field distribution, cooling flow rate, and loss variation laws of the cooling circuit were analyzed. The results show that the pump flow rate and magnetic coupling length have a minimal effect on the velocity distribution in the cooling circuit. When the magnet length increases from 30 mm to 55 mm, the temperature rise of the cooling circuit and the pressure drop at the gap increase by 23.1% and 25.3%, respectively. When the length of the magnetic coupling remains constant, the cooling flow rate of the cooling circuit falls with an increasing pump flow rate, and it reduces by 8.4% when the pump flow rate increases from 0.7 Q to 1.3 Q. The water friction loss and eddy current loss of the cooling circuit increase with an increase in the magnetic coupling length, while the cooling flow rate decreases. When the magnet length increases from 30 mm to 55 mm, the eddy current losses in the coupling circuit and the water friction losses in the cooling circuit increase by 45% and 35%, respectively, while the cooling flow rate decreases by 13%.

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BARAIA-ETXABURU ZUBIAURRE, IGOR, and David Garrido Diez. "BASICS OF INDUCTIVE COUPLING AND ROLE OF DECOUPLING CAPACITORS." DYNA 97, no. 6 (November 1, 2022): 579–83. http://dx.doi.org/10.6036/10456.

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Electromagnetic coupling is the mechanism by which one circuit induces noise or interference in another adjacent circuit. This coupling mechanism generates Electromagnetic Interferences that degrade or even interrupt the operation of adjacent circuits. However, it is often rare in the academic and professional fields of power electronics to have sufficient knowledge to identify and address this problem. Therefore, intuition plays an important role in anticipating and dealing with this problem. This article describes the basic principles of this coupling mechanism and proposes simple solutions to this electromagnetic interference problem. These solutions must be applied right from the design phase of any electronic equipment. The problem described and its solutions are experimentally validated in a simple test circuit. This article is mainly oriented to the academic and professional field of power electronics and aims to describe in a simple and experimental way the problems associated with inductive coupling.

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Wang, Wei Xin, and Wei Zhang. "Analyse the Field-Circuit Coupling Model of the Switching Converters." Applied Mechanics and Materials 336-338 (July 2013): 556–60. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.556.

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Based on the finite element methods of ANSYS software, field-circuit coupling methods are generally used in modeling and analsysing switch converter circuit of Simple step-up Boost circuit. Compare the Simulation results with ANSYS and MATLAB/simulink circumstances, Field-circuit coupling model is correct, through real calculation was tested and verified. Combination with authors preceding paper, there are indications that ANSYS software applies to electromagnetic field analyse electronic device and circuit. Above research works make a foundation for further studying electromagnetic field analyse problem working personnel and scientific research personnel are of application worthiness.

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Chen, Chung-Cheng, Jian Ke, and Yen-Ting Chen. "New Method of State-Space Formulation for Degenerate Circuit and Coupling Circuit." Mathematical Problems in Engineering 2019 (June 17, 2019): 1–13. http://dx.doi.org/10.1155/2019/1394725.

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The state-space formulation overcomes many limitations of traditional differential equation approach and is utilized as alternative to many traditional approaches in the modern electrical field. This paper proposes a new method of finding the state equation for degenerate circuit and coupling circuit that have not been systematically solved now. This paper also introduces some sound improvements to solve complicated dependent-source circuits. Four comparative examples are demonstrated to show the significant merits that our method owns over the traditional approaches.

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Liang, Zhen Guang, and Ming Yuan Yang. "The Coupling of Electrostatic Discharge to Electronic Equipment." Advanced Materials Research 732-733 (August 2013): 1179–83. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1179.

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Electrostatic Discharge (ESD) is a serious threat to electronic equipment. It can couple into equipment and disturb or even damage internal circuit. In the paper, the coupling of ESD to electronic equipment is presented. It includes the coupling of ESD to EUT and that to PCB. In the coupling of ESD to EUT, there gives five conduction interferences and shows that it’s important to obstruct ESD current and lead its route bypassing sensitive circuit. There also presents the coupling of ESD radiated field to EUT and PCB. It shows unintentional antenna structures and parasitic parameter circuits play important role in ESD interference. They need to be removed and restrained.

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Melgoza, E., R. Escarela-Perez, and M. A. Arjona. "Field-circuit coupling using existing network transients codes." IEEE Transactions on Magnetics 42, no. 4 (April 2006): 1055–58. http://dx.doi.org/10.1109/tmag.2006.871924.

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7

De Gersem, H., R. Mertens, U. Pahner, R. Belmans, and K. Hameyer. "A topological method used for field-circuit coupling." IEEE Transactions on Magnetics 34, no. 5 (1998): 3190–93. http://dx.doi.org/10.1109/20.717748.

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8

Hamed, M. "Coupling Between Separate Phases of Coaxial Double Circuit Transmission Lines." Active and Passive Electronic Components 13, no. 2 (1988): 85–111. http://dx.doi.org/10.1155/1988/24292.

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The paper studies the so-called coaxial overhead transmission lines. The concentric phases are considered. The mathematical analysis for voltage and current is presented. The telegraphic equations of the double circuit power lines with the mutual effect between circuits are introduced. The condition for single circuit transmission line is checked. The mutual effect between both circuits is studied on the basis of the ratio between the two currents of both circuits. The appeared phase shift between the two vectors of currents is inserted in the investigation. The magnetic field intensity at an external point of a line is mathematically expressed. Its value is approximated for the purpose of zero mutual inductance between phases of the same circuit. The mutual inductance between the two nearest groups of phases due to the linkage flux for the studied line is formulated. Its dependency on the distance from the phases as well as on the ratio of currents of both circuits is analysed. Then, the effect of phase shift on the mutual inductance is investigated. An idea for the control of the ratio between currents of both circuits of a line is presented.

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WESSEL-BERG, TORE. "SELF-CONSISTENT FIELD THEORY OF GENERAL PERIODIC CIRCUITS FOR TRAVELING WAVE TUBES." International Journal of High Speed Electronics and Systems 04, no. 04 (December 1993): 365–407. http://dx.doi.org/10.1142/s0129156493000170.

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A general method for exact analysis of cylindrical periodic circuits for traveling wave tubes without initial assumptions of field or current distributions is described. The procedure is based on transforming the stationary periodic circuit to Fourier space, in the same manner as one does the ordinary RF fields. By this approach the circuit is represented in Fourier space by an infinite number of harmonic circuit components. The interaction, or coupling, between the field harmonics and the stationary circuit harmonics is conceptually a convolution process. The mathematical description of this process involves the intermediary of a convoluting circuit matrix formed from the harmonics of the stationary metallic circuit. For any circuit this matrix is Hermitian and therefore guaranteed a full set of orthogonal eigenvectors and corresponding real eigenvalues. This complete set of vectors serves as a basis for expansions of the RF electric and magnetic harmonic fields. Due to the general nature of the metallic circuit, with surface areas that are partly metallic and partly open, the eigenvectors separate into two distinct sets, one set having eigenvalues equal or close to unity, and the other set eigenvalues equal or close to zero. The first set is associated directly with the metallic parts of the circuit and describes localized surface modes, including surface currents on the two circuit boundaries. The second set, which essentially is a nullset, does not "see" the metallic parts of the circuit, and describes the fields in the open areas of the circuit. Similar expansions are made in the dielectric rod support system exterior to the circuit itself. The paper provides a systematic and general analysis of the entire periodic configuration, based on a conversion of the field equations to a set of first order differential equations in the tangential components of the RF electric and magnetic field harmonics. In all regions the solutions are expressed in terms of transmission matrices which combine through simple boundary conditions to form an overall homogeneous set of equations. Its numerical solution provides all relevant data for the entire periodic configuration, comprising the finite thickness circuit itself, the dielectric support rods, and the enclosing metallic shield. The paper provides explicit formulae for numerical calculations of circuit characteristics, such as omega-beta diagram, interaction impedance, loss due to finite circuit conductivity, and detailed field and current distributions. Throughout the paper emphasis is placed on generality, so that the results are applicable to any kind of periodic cylindrical circuits. Application of the theory to a tape helix circuit is discussed briefly.

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10

Jia, Huili, Jiaqiang Yang, Rongfeng Deng, and Yan Wang. "Loss Investigation for Multiphase Induction Machine under Open-Circuit Fault Using Field–Circuit Coupling Finite Element Method." Energies 14, no. 18 (September 9, 2021): 5686. http://dx.doi.org/10.3390/en14185686.

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This paper focuses on the loss estimation for the multiphase induction machine (IM) operating under fault-tolerant conditions through the field–circuit coupling finite element method (FEM). Both one-phase and two-phase open-circuit faults of a seven-phase IM are researched, and different spatial positions of the fault phases are taken into consideration. The magnitudes and phase angles of the residual phase’s current are deduced based on the principle of equal magnitude of the residual phase currents and unchanged fundamental magnetic motive force (MMF). The magnetic fields’ coupling between the fundamental and harmonic planes is analyzed. Then, the time-stepping electromagnetic fields calculation of the seven-phase IM are carried out under the commercial software Simplorer–Maxwell environment. The transient and steady performance for both the health and fault conditions are obtained based on the rotor field-oriented control (RFOC) strategy. The Joule loss and iron loss are calculated for the torque step and slope responses. The seven-phase motor driving platform is established to verify the numerical calculation results. The proposed method is effective for predicting the loss and designing a reasonable operating range for multiphase IM operating under fault-tolerant conditions considering the thermal balance.

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Chen, Feng, Qingquan Gan, and Boyi Yu. "Development of the Electromagnetic Calculation Software Package for a Synchronous Motor Based on the Field-Circuit Combination Algorithm." Wireless Communications and Mobile Computing 2021 (August 9, 2021): 1–6. http://dx.doi.org/10.1155/2021/5120174.

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Nowadays, domestic motor manufacturers often use high-speed circuit and magnetic circuit parameters in engine models. In addition, the calculation accuracy is low and cannot fully meet the requirements of a modern engine design. The field-circuit combination algorithm is based on electric field analysis, which avoids many rough assumptions and empirical formulas; its calculations are more accurate and reliable than traditional algorithms. It is used to analyze and calculate the steady-state operating conditions and characteristics of motors, which can effectively improve the design level of China’s boss synchronous motors. This article mainly introduces software algorithms and auxiliary FDTD methods. In this article, we use the field-circuit coupling algorithm to develop an electromagnetic calculation software package for synchronous motors and establish a mathematical model for the potential field-circuit coupling algorithm. We use the cassette electromagnetic calculation program to solve the model, evaluate the synchronous motor, and use historical data to modify the model and improve the accuracy of the development-state evaluation of the electromagnetic calculation software package for the synchronous motor based on the motor electromagnetic circuit coupling algorithm. The experimental results of this article show that the field circuit combination algorithm increases the development of the electromagnetic calculation software package for synchronous motors by 55% and reduces the false alarm rate and false alarm rate. Finally, by comparing the phases of traditional algorithms, we analyzed the excitation circuit combination algorithm to calculate the parameters and performance of the synchronous motor.

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12

Chen, Jing, Keqi Zhang, Zhenguang Liang, Zongzhan Du, and Hengxu Zhang. "Digital twin-oriented multi-physics field simulation analysis of high-voltage SF₆ circuit breakers." Journal of Physics: Conference Series 2409, no. 1 (December 1, 2022): 012020. http://dx.doi.org/10.1088/1742-6596/2409/1/012020.

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Abstract Circuit breakers are important components for removing short circuits in power systems and ensuring safe operation. The operation of circuit breakers may not be predicted and thus cause accidents, so there is an urgent need to innovate means to assess the operation status of power equipment and monitor the operation status of power grids in full real time, to improve the monitoring capability of major key equipment, and to study key technologies for the digital twin of circuit breakers to support the safe and stable operation of transmission networks and the digital transformation of energy systems. This paper establishes the multi-physics field coupling calculation model of the circuit breaker opening process, completes the simulation calculation of the circuit breaker opening process, gets the distribution and change trend of parameters such as electric field, pressure, temperature, density, and airflow speed inside the interrupting chamber, and analyzes the flow characteristics inside the interrupting chamber in different opening processes. We select the characteristic parameters and provide data support for the establishment of fault diagnosis based on the digital twin of the circuit breaker.

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Zhou, Quan, Xiaobing Zou, and Xinxin Wang. "Field-Circuit Coupling Simulation of Petawatt-Class Z-Pinch Accelerator." IEEE Transactions on Plasma Science 47, no. 6 (June 2019): 2916–21. http://dx.doi.org/10.1109/tps.2019.2914178.

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14

Gausling, Kai, and Andreas Bartel. "Coupling Interfaces and Their Impact in Field/Circuit Co-Simulation." IEEE Transactions on Magnetics 52, no. 3 (March 2016): 1–4. http://dx.doi.org/10.1109/tmag.2015.2471181.

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15

Strauss, G., and W. S. Menzel. "Millimeter-wave monolithic integrated circuit interconnects using electromagnetic field coupling." IEEE Transactions on Components, Packaging, and Manufacturing Technology: Part B 19, no. 2 (May 1996): 278–82. http://dx.doi.org/10.1109/96.496029.

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16

Sun, Ke, Jianwen Shi, Wei Cui, and Guoying Meng. "Theoretical Computational Model for Cylindrical Permanent Magnet Coupling." Electronics 10, no. 16 (August 21, 2021): 2026. http://dx.doi.org/10.3390/electronics10162026.

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Permanent magnet coupling is extensively studied owing to its economic efficiency and stability. In this study, a computational model for cylindrical permanent magnet coupling (CPMC) was designed using the magnetic field division method to divide an air gap magnetic field. An equivalent magnetic circuit model was also designed based on the equivalent magnetic circuit method. The novelty of this study is that both the skin effect and the working point of the permanent magnet are taken into consideration to obtain the magnetic circuit and induce eddy current characteristics of permanent magnet coupling. Furthermore, a computational model was obtained for the transmission torque of the CPMC based on the principles of Faraday’s and Ampere’s laws. Additionally, the accuracy of the model was verified using a finite element simulation model and a test bench.

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Knight-Percival, Alexander, Christopher Johnson, Benjamin Richards, Scott Palmer, and Nicholas Bowring. "Mapping of the electromagnetic environment on the railway: Condition monitoring of signalling assets." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 234, no. 3 (October 9, 2018): 246–56. http://dx.doi.org/10.1177/0954409718802998.

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Conventional track circuit condition monitoring systems are fixed at the wayside, with each installation reporting on a single track circuit. In this work, we present a custom-built, sensitive, magnetic field detection system, which can be fitted to the underside of a rail vehicle. With this system installed, some characteristics of an operating track circuit can be monitored from the vehicle whilst it is in motion. By using appropriate analysis techniques, it is possible to identify the signatures of equipment relating to audio frequency track circuits, the topic of this work. Analysing the signatures of track circuit equipment demonstrated that there were clear differences between track circuit assets. By building on other research into the behaviours of failing track circuits, and continuing to conduct this research, the authors believe that it is possible, and beneficial, to perform condition monitoring of track circuits from low-cost equipment mounted on the train. Coupling this with advanced analysis techniques will allow predictive maintenance of track circuits with very little capital outlay.

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18

Ikeda, Hikaru, and Yasushi Itoh. "A 2.4 GHz-Band 250 W, 60% Feedback-Type GaN-HFET Oscillator Using Imbalanced Coupling Resonator for Use in the Microwave Oven." Applied Sciences 9, no. 14 (July 19, 2019): 2887. http://dx.doi.org/10.3390/app9142887.

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Circuit design techniques for enhancing an efficiency of the high power feedback-type GaN-HFET (Gallium Nitride Heterojunction Field Effect Transistor) oscillator for use in the microwave oven are shown in this paper, focusing primarily on the harmonic terminations for high efficiency of power amplifiers, the coupling factor to feedback circuits and the insertion phase adjustment of feedback loops. With the use of these circuit design techniques, an output power of 263 W and an efficiency of 61.3% have been successfully achieved at 2.44 GHz.

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Feng, Yanming, Zhiguo Li, Qiang Zhao, Pingping Chen, and Jiqing Wang. "Evaluation of Fano resonance and phase analysis of plasma induced transparency in photonic nanostructure based on equivalent circuit analysis." Journal of Optics 24, no. 3 (February 4, 2022): 035001. http://dx.doi.org/10.1088/2040-8986/ac4b88.

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Abstract Fano resonance and plasma induced transparency (PIT) have been widely observed in various plasmonic nanostructures. Fano resonance takes place in weak coupling regime where coupling constant between two electromagnetic modes is lower than damping constant of system. Hence, extracting coupling and damping coefficients from resonance spectrum is the key to distinguish between Fano resonance and other resonances. In this paper, we propose a simple and realizable coupled LC circuit to analyze Fano resonance and PIT. Weak and strong coupling regime are distinguished by comparing coupling constant with damping constant. Meanwhile, we gain deep insight into Fano resonance and PIT in circuit by analyzing circuit phase and understand their connection with resonance in photonic structure. Furthermore, we extend the equivalent circuit model to the field involved short-range plasmon polarization or multi-orders dark modes. Since there are no specific parameters associated with photonic nanostructure, the proposed equivalent circuit can be used in most plasmonic resonance system as an universal model.

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Zhang, Zhigang, Dongxue Zhao, Huiyong He, Lijun Tang, and Qian He. "Analysis of Noise-Detection Characteristics of Electric Field Coupling in Quartz Flexible Accelerometer." Micromachines 14, no. 3 (February 25, 2023): 535. http://dx.doi.org/10.3390/mi14030535.

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The internal electric field coupling noise of a quartz flexible accelerometer (QFA) restricts the improvement of the measurement accuracy of the accelerometer. In this paper, the internal electric field coupling mechanism of a QFA is studied, an electric field coupling detection noise model of the accelerometer is established, the distributed capacitance among the components of the QFA is simulated, the structure of the detection noise transfer system of different carrier modulation differential capacitance detection circuits is analyzed, and the influence of each transfer chain on the detection noise is discussed. The simulation results of electric field coupling detection noise show that the average value of detection noise can reach 41.7 μg, which is close to the effective resolution of the QFA, 50 μg. This confirms that electric field coupling detection noise is a non-negligible factor affecting the measurement accuracy of the accelerometer. A method of adding a high-pass filter to the front of the phase-shifting circuit is presented to suppress the noise of electric field coupling detection. This method attenuates the average value of the detected noise by about 78 dB, and reduces the average value of the detected noise to less than 0.1 μg, which provides a new approach and direction for effectively breaking through the performance of the QFA.

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Huang, Shize, Fan Zhang, Yue Liu, and Qiyi Guo. "A dynamic simulation of the circuit breaking electromagnetic system with a drive circuit." Advances in Mechanical Engineering 11, no. 3 (March 2019): 168781401982856. http://dx.doi.org/10.1177/1687814019828564.

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A circuit breaking electromagnetic system is the actuator and digital controller for a switching device. Its performance can significantly affect operations of the switching device. We propose a dynamic simulation method coupling the electric field and the magnetic field for the circuit breaking electromagnetic system and its drive circuit. The method combines both statistic and dynamic analyses, and differential equations. Finally, we utilize the flux transformer as an example to validate this method and reveal the dynamic characteristics of the drive transformer by changing the parameters of the drive circuit.

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Hao, FangZhou, Haiyan Wen, Hongshan Zhao, and Zili Li. "Electromagnetic vibration analysis method of short circuit in transformer winding based on field circuit coupling." Journal of Physics: Conference Series 1311 (September 2019): 012022. http://dx.doi.org/10.1088/1742-6596/1311/1/012022.

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Yang, Yang, Zhao-Dong Xu, Ying-Qing Guo, Yan-Wei Xu, and Jie Zhang. "Internal magnetic field tests and magnetic field coupling model of a three-coil magnetorheological damper." Journal of Intelligent Material Systems and Structures 31, no. 19 (July 27, 2020): 2179–95. http://dx.doi.org/10.1177/1045389x20943948.

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Magnetorheological damper is a typical semi-active control device. Its output damping force varies with the internal magnetic field, which is a key factor affecting the dynamic performance of the magnetorheological dampers. Existing studies about the magnetic field of magnetorheological dampers are limited to theoretical analysis; thus, this study aims to experimentally explore the complicated magnetic field distribution inside the magnetorheological dampers with multiple coils. First, the magnetic circuit of a three-coil magnetorheological damper was theoretically analyzed and designed, and the finite element model of the three-coil magnetorheological damper was set up to calculate the magnetic induction intensities of the damping gaps in different currents and numbers of coil turns. A three-coil magnetorheological damper embedded with a Hall sensor was then manufactured based on the theoretical and finite element analysis, and internal magnetic field tests under different conditions were carried out to obtain the actual magnetic induction intensities. At last, the magnetic field coupling model of the three-coil magnetorheological damper was proposed by introducing a coupling coefficient to describe the complex magnetic field distribution due to the strong coupling effect of the three coils, and the results calculated by the proposed model agreed well with the finite element analysis and magnetic field test data. The proposed model lays a foundation for the optimal design of the magnetic circuit and the mathematical model of multi-coil magnetorheological dampers.

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Choudhury, Sayantan, Rakshit Mandish Gharat, Saptarshi Mandal, and Nilesh Pandey. "Circuit Complexity in Interacting Quenched Quantum Field Theory." Symmetry 15, no. 3 (March 5, 2023): 655. http://dx.doi.org/10.3390/sym15030655.

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In this work, we explore the effects of quantum quenching on the circuit complexity of quenched quantum field theory with weakly coupled quartic interactions. We use the invariant operator method under a perturbative framework to compute the ground state of this system. We give the analytical expressions for specific reference and target states using the ground state of the system. Using a particular cost functional, we show the analytical computation of circuit complexity for the quenched and interacting field theory. Furthermore, we give a numerical estimate of circuit complexity with respect to the quench rate, δt, for two coupled oscillators. The parametric variation in the unambiguous contribution of the circuit complexity for an arbitrary number of oscillators has been studied with respect to the dimensionless parameter (t/δt). We comment on the variation in the circuit complexity for different values of coupling strength, different numbers of oscillators and even in different dimensions.

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Liu, Wei Fang, Wei Dong Zhang, Xiang Cui, Guang Pei An, Qian Wan, and Zhi Xia Wang. "The Study of Radiation Coupling Characteristics of Monitoring Circuit Board Excited by Electromagnetic Field." Applied Mechanics and Materials 437 (October 2013): 544–47. http://dx.doi.org/10.4028/www.scientific.net/amm.437.544.

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HVDC has been rapid development in recent years, but the problems of the electromagnetic compatibility of converter valve control circuit are becoming more and more prominent. In order to study the PCB anti-harassment problem, we study radiation coupling mechanism of monitoring circuit board. In order to simplify the model, firstly we study microstrip line using transmission line method, and then create a physical model of monitoring circuit board. Through simulation, we can acquire the induced voltage of the chip pins as well as the distribution of electromagnetic field around.

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JI, Y. H., and Y. M. LIU. "STUDY ON QUANTUM CORRELATIONS FOR CIRCUIT QED STATES." International Journal of Modern Physics B 27, no. 13 (May 15, 2013): 1350056. http://dx.doi.org/10.1142/s0217979213500562.

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We investigate the dynamic evolution behaviors of entanglement and geometric quantum discord of coupled superconducting qubits in circuit QED system. We carefully analyze the effect of cavity field quantum state on the quantum entanglement and quantum correlations dynamic behaviors of coupling superconducting qubits. The results show that when the cavity field is in coherent state, with the average photon number increasing, the quantum discord death (including entanglement death) would become more difficult to appear, that is to say prolonging the survival time of quantum correlations will be a benefit for keeping the quantum correlations. When the cavity field is in squeezed state, the squeezed amplitude parameters are all too big or too small to keep the system quantum correlations. However, the further study results show that with the initial relative phase of coupling superconducting increasing, qubits can also keep the quantum correlations.

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Zhang, Yan Li, Ning Zhang, Ya Hua Kang, Xiu Ke Yan, and De Xin Xie. "Magnetic Field Analysis of a Complex Construction Transformer Using Direct Field-Circuit Coupling Method." Advanced Materials Research 614-615 (December 2012): 1230–33. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1230.

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This paper deals with the main magnetic field distribution for a three-phase five-column disintegration transformer with the iron core disassembled into several parts owing to limited transport condition. The finite element method is employed to solve such a special configuration transformer, in which the direct field-circuit coupling formulation is derived and programmed by APDL programming language. The calculation results, such as the magnetic field distribution in transformer core, the exciting current magnitude and no-load loss are investigated. The optimum size of air gap between each separated iron core limbs is discussed.

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Wang, Shuhong, Dongsheng Yuan, An Wang, Kecheng Liu, Hailin Li, and Shuang Wang. "Circuit-Field Coupling and Magnetic-Thermal Coupling Analysis of RRF Converter Designed With Magnetic Integration." IEEE Transactions on Magnetics 55, no. 5 (May 2019): 1–8. http://dx.doi.org/10.1109/tmag.2019.2904572.

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Gad, Emad. "Circuit-Based Analysis of Electromagnetic Field Coupling With Nonuniform Transmission Lines." IEEE Transactions on Electromagnetic Compatibility 50, no. 1 (2008): 149–65. http://dx.doi.org/10.1109/temc.2007.911939.

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Herold, Thomas, Enno Lange, and Kay Hameyer. "System Simulation of a PMSM Servo Drive Using Field-Circuit Coupling." IEEE Transactions on Magnetics 47, no. 5 (May 2011): 938–41. http://dx.doi.org/10.1109/tmag.2010.2090866.

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Nur Hazwani Hussin, Muhammad Mokhzaini Azizan, Azuwa Ali, Norhidayu Rameli, Nur Hazirah Zaini, and Shahnurriman Abdul Rahman. "Comparison Techniques for Optimization Switching Frequency In Energy Encryption Of Wireless Power Transfer System." Journal of Advanced Research in Applied Sciences and Engineering Technology 26, no. 2 (April 10, 2022): 24–28. http://dx.doi.org/10.37934/araset.26.2.2428.

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This paper reviews the techniques for optimization switching frequency used in Wireless power transfer (WPT). WPT is one of the most useful ways to transfer power. Based on distances power transfer, the WPT system can be divided into three categories, namely, near, medium, and far fields. Inductive coupling and capacitive coupling contactless techniques are used in the near-field WPT. Magnetic resonant coupling technique is used in the medium-field WPT. Electromagnetic radiation is used in the far-field WPT. From the comparison in this paper, a model and design algorithm to optimize switching frequency for energy encryption of medium field wireless power transfer system are purposed. The maximum value of the performance are suitable to compute the optimal circuit parameter by algorithm itself.

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Глотова, Т. С., А. С. Иваницкий, and В. В. Глотов. "EQUIVALENT DIPOLE MODEL FOR ESTIMATING THE NEAR FIELD OF RES STRUCTURES." ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, no. 5() (November 18, 2020): 102–6. http://dx.doi.org/10.36622/vstu.2020.16.5.015.

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Электромагнитная совместимость интегральных микросхем становится все более важным аспектом в разработке высокоскоростных печатных плат. Международные стандарты были установлены для количественной и качественной оценки характеристик интегральных микросхем, а также помехоустойчивости с использованием различных методов измерения. Для решения задач, связанных с прогнозированием электромагнитных помех между интегральными микросхемами и печатными платами, необходимы модели интегральных микросхем как на внутриаппаратурном уровне, так и внутрисистемном. Такие модели могут быть получены из моделирования при наличии достаточной информации об интегральной микросхеме. Однако в большинстве практических случаев подробная информация об интегральных микросхемах может быть недоступна разработчикам радиоэлектронного оборудования. Предлагается улучшенная модель дипольного момента для анализа характеристик связи ближнего и дальнего электромагнитного поля от интегральной микросхемы, полученная на основе сканирования ближнего поля. Представлен массив электрических и магнитных дипольных моментов, используемых для воспроизведения распределений поля в плоскости сканирования над интегральной микросхемой. Полученные дипольные моменты могут использоваться в качестве источников излучений для интегральной микросхемы. Усовершенствованная модель дипольного момента особенно полезна для решения проблем радиочастотных помех, когда необходимо точно проанализировать шумовую связь в ближнем поле Electromagnetic compatibility of integrated circuits is becoming an increasingly important aspect in the design of high-speed printed circuit boards. International standards have been established to quantitatively and qualitatively assess the performance of integrated circuits as well as noise immunity using a variety of measurement methods. To solve problems associated with predicting electromagnetic interference between integrated microcircuits and printed circuit boards, models of integrated microcircuits are needed both at the in-hardware and in-system levels. Such models can be obtained from simulations if there is sufficient information about the integrated circuit. However, in most practical cases, detailed information on integrated circuits may not be available to avionics designers. An improved model of the dipole moment is proposed for analyzing the characteristics of the coupling of the near and far electromagnetic fields from an integrated circuit, obtained on the basis of scanning the near field. An array of electric and magnetic dipole moments is presented, used to reproduce the field distributions in the scanning plane above an integrated microcircuit. The obtained dipole moments can be used as sources of radiation for an integrated circuit. The advanced dipole moment model is especially useful for solving RFI problems when it is necessary to accurately analyze noise communications in the near field

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33

Lin. "Analysis of a DC Converter with Low Primary Current Loss and Balance Voltage and Current." Electronics 8, no. 4 (April 17, 2019): 439. http://dx.doi.org/10.3390/electronics8040439.

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A dc/dc pulse width modulation (PWM) circuit was investigated to realize the functions of reduced primary current loss and balanced voltage and current distribution. In the presented dc/dc converter, two full bridge pulse width modulation circuits were used with the series/parallel connection on the high-voltage/low-voltage side. The flying capacitor was adopted on the input side to achieve voltage balance on input split capacitors. The magnetic coupling element was employed to achieve current sharing between two parallel circuits. A capacitor-diode passive circuit was adopted to lessen the primary current at the commutated interval. The phase-shifted duty cycle control approach was employed to regulate load voltage and implement soft switching characteristics of power metal-oxide-semiconductor field-effect transistors (MOSFETs). Finally, the experimental results using a 1.68 kW prototype converter were obtained to confirm the performance and feasibility of the studied circuit topology.

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Zhou, Shuanghong, Yuanlin Yao, Yuting Zhang, and Bin Ge. "Electromagnetic Particle Algorithm for Beam–Wave Interaction in Traveling Wave Tube of Symmetry." Symmetry 14, no. 10 (October 12, 2022): 2119. http://dx.doi.org/10.3390/sym14102119.

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In many fields, such as space astrophysics, plasma and vacuum electronics, there are many nonlinear strong coupling physical problems. In order to solve the problem of electron beam–wave interaction in cylindrical Traveling wave tube (TWT) with symmetrical structure, a multi particle simulation algorithm for beam circuit is designed. The algorithm allows aperiodic time input, nonuniform linearity and large space diagnosis for different particles. In this algorithm, the field of coupled slow-wave transmission line is simulated by finite difference method. Assuming that there is strong coupling between the beam and the circuit, the space center equation of transmission along the line is obtained, and the space charge field is modeled considering the space charge effect, which can easily be ignored. The Particle In Cell (PIC) method of frog leaping step scheme is adopted to evaluate the electric field of each particle center, determine the circuit and space charge field, and design the termination part to compensate for the loss in order to avoid self-excited agitation. Finally, a simple numerical simulation is carried out for the electromagnetic problem and the accuracy of the code is checked against the electromagnetic simulator CHPIC. Therefore, the algorithm can be used to solve the problem of beam–wave interactions in a fixed structure (cylindrical) in multiple fields and can accurately record the data in the process.

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Wang, Chunni, Zhao Yao, Wenkang Xu, and Guodong Ren. "Phase synchronization between nonlinear circuits by capturing electromagnetic field energy." Modern Physics Letters B 34, no. 29 (July 14, 2020): 2050323. http://dx.doi.org/10.1142/s0217984920503236.

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Smart nonlinear circuits can be tamed to reproduce the main dynamical properties in neural activities and thus neural circuits are built to estimate the occurrence of multiple modes in electric activities. In the presence of electromagnetic radiation, the cardiac tissue, brain and neural circuits are influenced because field energy is injected and captured when induction field and current are generated in the media and system. In this paper, an isolated Chua circuit is exposed to external electromagnetic field and energy capturing is estimated for nonlinear analysis from physical viewpoint. Furthermore, two Chua circuits without direct variable coupling are exposed to the same electromagnetic field for energy capturing. Periodical and noise-like radiations are imposed on the Chua circuits which can capture the magnetic field energy via the induction coil. It is found that the two Chua circuits (periodical or chaotic) can reach phase synchronization and phase lock in the presence of periodical radiation. On the other hand, noise-like radiation can realize complete synchronization between two chaotic Chua circuits while phase lock occurs between two Chua circuits in periodical oscillation. It gives some important clues to control the collective behaviors of neural activities under external field.

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Kotzev, Miroslav, Xiaotang Bi, Matthias Kreitlow, and Frank Gronwald. "Equivalent circuit simulation of HPEM-induced transient responses at nonlinear loads." Advances in Radio Science 15 (September 21, 2017): 175–80. http://dx.doi.org/10.5194/ars-15-175-2017.

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Abstract. In this paper the equivalent circuit modeling of a nonlinearly loaded loop antenna and its transient responses to HPEM field excitations are investigated. For the circuit modeling the general strategy to characterize the nonlinearly loaded antenna by a linear and a nonlinear circuit part is pursued. The linear circuit part can be determined by standard methods of antenna theory and numerical field computation. The modeling of the nonlinear circuit part requires realistic circuit models of the nonlinear loads that are given by Schottky diodes. Combining both parts, appropriate circuit models are obtained and analyzed by means of a standard SPICE circuit simulator. It is the main result that in this way full-wave simulation results can be reproduced. Furthermore it is clearly seen that the equivalent circuit modeling offers considerable advantages with respect to computation speed and also leads to improved physical insights regarding the coupling between HPEM field excitation and nonlinearly loaded loop antenna.

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Zhang, Chenhao, Yiming Zhang, Xuhong Wang, and Hongyan Meng. "Study of Nonlinear Excitation Circuits for Fluxgate Magnetometer." Sensors 23, no. 5 (February 27, 2023): 2618. http://dx.doi.org/10.3390/s23052618.

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This paper presents the common methods and corresponding drawbacks concerning nonlinear analysis of fluxgate excitation circuits and emphasizes the importance of nonlinear analysis for these circuits. With regard to the nonlinearity of the excitation circuit, this paper proposes the use of the core-measured hysteresis curve for mathematical analysis and the use of a nonlinear model that considers the coupling effect of the core and winding and influence of the historical magnetic field on the core for simulation analysis. The feasibility of mathematical calculations and simulation for the nonlinear study of fluxgate excitation circuit is verified via experiments. The results demonstrate that, in this regard, the simulation is four times better than a mathematical calculation. The simulation and experimental results of the excitation current and voltage waveforms under different excitation circuit parameters and structures are essentially consistent, with a difference in current of no more than 1 mA, thereby verifying the effectiveness of the nonlinear excitation analysis method.

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Kurz, S. "Some remarks about flux linkage and inductance." Advances in Radio Science 2 (May 27, 2005): 39–44. http://dx.doi.org/10.5194/ars-2-39-2004.

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Abstract. In the area of computational electromagnetics there is an increasing demand for various coupled simulations. One example is the coupling between field and circuit simulation for the description of electromagnetic devices. In the context of such couplings, theoretical questions arise as well. How can a field device be represented as an equivalent multiport circuit element? What is meant by flux linkage if the considered conductors are not filamentary? What is meant by inductance if the magnetic media exhibit nonlinear behaviour? These questions and their answers are not new. However, according to the author’s view, these issues are not sufficiently addressed in the usual textbooks. The aim of the paper is therefore to (hopefully) answer the questions concisely and correctly. The modern language of differential forms will be employed for this purpose.

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Lin, Haidan, and Yiran Shen. "A VO2 Neuristor Based on Microstrip Line Coupling." Micromachines 14, no. 2 (January 28, 2023): 337. http://dx.doi.org/10.3390/mi14020337.

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The neuromorphic network based on artificial neurons and synapses can solve computational difficulties, and its energy efficiency is incomparable to the traditional von Neumann architecture. As a new type of circuit component, nonvolatile memristors are very similar to biological synapses in structure and function. Only one memristor can simulate the function of a synapse. Therefore, memristors provide a new way to build hardware-based artificial neural networks. To build such an artificial neural network, in addition to the artificial synapses, artificial neurons are also needed to realize the distribution of information and the adjustment of synaptic weights. As the VO2 volatile local active memristor is complementary to nonvolatile memristors, it can be used to simulate the function of neurons. However, determining how to better realize the function of neurons with simple circuits is one of the current key problems to be solved in this field. This paper considers the influence of distribution parameters on circuit performance under the action of high-frequency and high-speed signals. Two Mott VO2 memristor units are connected and coupled with microstrip lines to simulate the Hodgkin–Huxley neuron model. It is found that the proposed memristor neuron based on microstrip lines shows the characteristics of neuron action potential: amplification and threshold.

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Zeng, Lin Suo, and Li Zhu Sun. "Analysis of Electromagnetic Field and Temperature Field of Low Speed High Torque Permanent Magnet Motor under Locked-Rotor Operation." Advanced Materials Research 383-390 (November 2011): 2963–67. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2963.

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Low speed high torque direct drive motor has been widely applied in various industries. However, operation faults occur frequently due to the complex working conditions of the motor, especially the locked-rotor fault. Therefore, it is necessary to do deeply research in this case of the electromagnetic field and the temperature field distribution of the motor. Taking a 5kW, 10-pole tangential type Low speed high torque permanent magnet (PM) motor for example, based on field-circuit coupled finite element method, 2-D motor field, circuit and motion coupling is achieved. On this basis, the temperature field of the motor is analyzed. Finally the results which are consistent with the actual project are obtained.

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Deng, Jiang Hua, Yi Ming Zheng, Chao Tang, and Yan Ran Zhan. "Analysis of Charge Circuit and Discharge Circuit in Electromagnetic Riveting." Applied Mechanics and Materials 241-244 (December 2012): 606–9. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.606.

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The analysis of charge circuit and discharge circuit is a key part in the theoretical study of electromagnetic riveting electromagnetic field. Numerical simulation was used to establish the charge circuit model and the discharge circuit model which was an electric circuit-magnetic circuit coupling process by ANSYS. The simulation of charge circuit shows that the development of the charge current over time is an exponential descending change and that of the charge voltage over time is an exponential ascending change. And, the simulation of discharge circuit indicates that the driver is mainly subjected to axial magnetic force, whose distribution is non-uniform along the radial direction of driver, and the maximum value of axial magnetic force locates in about half of the driver radius.

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Smith, Robert G. "Simulation of an anatomically defined local circuit: The cone-horizontal cell network in cat retina." Visual Neuroscience 12, no. 3 (May 1995): 545–61. http://dx.doi.org/10.1017/s0952523800008440.

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AbstractThe outer plexiform layer of the retina contains a neural circuit in which cone synaptic terminals are electrically coupled and release glutamate onto wide-field and narrow-field horizontal cells. These are also electrically coupled and feed back through a GABAergic synapse to cones. In cat this circuit's structure is known in some detail, and much of the chemical architecture and neural responses are also known, yet there has been no attempt to synthesize this knowledge. We constructed a large-scale compartmental model (up to 50,000 compartments) to incorporate the known anatomical and biophysical facts. The goal was to discover how the various circuit components interact to form the cone receptive field, and thereby what possible function is implied. The simulation reproduced many features known from intracellular recordings: (1) linear response of cone and horizontal cell to intensity, (2) some aspects of temporal responses of cone and horizontal cell, (3) broad receptive field of the wide-field horizontal cell, and (4) center-surround cone receptive field (derived from a “deconvolution model"). With the network calibrated in this manner, we determined which of its features are necessary to give the cone receptive field a Gaussian center-surround shape. A Gaussian-like center that matches the center derived from the ganglion cell requires both optical blur and cone coupling: blur alone is too narrow, coupling alone gives an exponential shape without a central dome-shaped peak. A Gaussian-like surround requires both types of horizontal cell: the narrow-field type for the deep, proximal region and the wide-field type for the shallow, distal region. These results suggest that the function of the cone-horizontal cell circuit is to reduce the influence of noise by spatio-temporally filtering the cone signal before it passes through the first chemical synapse on the pathway to the brain.

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Zhang, Ying, Xuhui Wen, Wenchao Li, Jialin Wei, Xiaofeng Zhang, and Youlong Wang. "Analytical study on discharge process of multiphase air-core pulsed alternators." Engineering Research Express 3, no. 4 (December 1, 2021): 045060. http://dx.doi.org/10.1088/2631-8695/ac41b3.

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Abstract This paper has investigated the discharge process of a four-phase air-core pulsed alternator. A mathematical model of the short-circuit current, relating to firing angles of discharge thyristors and taking the current coupling and field current attenuation into account, is established. Compared with the conventional trial-and-error method and existing phase peak current model, the proposed model has considered the attenuation trend of the field current in the discharge process and derived the intuitive expression of the resultant short-circuit current. Firstly, the state equation model of a four-phase air-core pulsed alternator is established. Meanwhile, the simulation comparison indicates that the results of the state equation model are close to the finite-element model. Then, the segmented formula of resultant short-circuit current is derived based on the voltage equations of the armature winding circuits and the approximate attenuation coefficient of the field current. Finally, the segmented formula is verified with the finite-element method, and some preliminary experiments for field windings are carried out. The results show that this method can well describe the decay trend of field current and discharge current. It is helpful for selecting firing angles to generate the desired current amplitude and waveform in the future.

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Zerrouk, Ilham, Mohamed Amellal, Amine Amharech, Mohamed Ramdani, and Hassane Kabbaj. "Theoretical and experimental analysis of electromagnetic coupling into microwave circuit." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 1 (February 1, 2019): 181. http://dx.doi.org/10.11591/ijece.v9i1.pp181-189.

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<span lang="EN-US">In this paper, our work is devoted to a time domain analysis of field-to-line coupling model. The latter is designed with a uniform microstrip multiconductor transmission line (MTL), connected with a mixed load which can be linear as a resistance, nonlinear like a diode or complex nonlinear as a Metal Semiconductor Field-Effect Transistor (MESFET). The finite difference time-domain technique (FDTD) is used to compute the expression of voltage and current at the line. The primary advantage of this method over many existing methods is that nonlinear terminations may be readily incorporated into the algorithm and the analysis. The numerical predictions using the proposed method show a good agreement with the GHz Transverse Electro Magnetic (GTEM) measurement.</span>

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Labiedh, Walid, Bessem Zitouna, Mohamed Tlig, and Jaleleddine Slama. "Analysis and Modeling of Film Capacitor Radiation Generic Radiating Model for the Rectangular Capacitors." Applied Computational Electromagnetics Society 36, no. 4 (May 10, 2021): 425–34. http://dx.doi.org/10.47037/2020.aces.j.360408.

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Capacitors are sources of EM field emissions whose characterization is crucial for electronic circuits EMC. This paper presents the modeling of equivalent radiating sources of rectangular film capacitors. It presents and analyses the magnetic near field measured above plastic and polyester capacitors. The measurements are then used by the inverse method to create a radiating source model for the capacitor. The results show a good agreement between the measured cartography and the one obtained when using radiating sources model. Finally, a generic radiating model is proposed for various types of rectangular film capacitors. The generic model is validated using the measurements on a rectangular capacitor. The suggested radiating model accelerates solving the inverse method. It can be used by circuit designers to optimize the placement of capacitors on the printed circuit board to reduce their coupling with other components of the studied system.

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Wang, Ji, Qiang Liu, Yu Jun Liu, Bing Shi, Ye Dong Bao, and Li Jun Zhang. "The Design and Simulation of Circuit for Electromagnetic Force Assisted Line Heating Device." Advanced Materials Research 652-654 (January 2013): 2010–18. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.2010.

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In the process of line heating, a pulsed electromagnetic force is added to steel plates as an approximately consecutive constrained force of certain frequency. It improves the condition of steel plates heated at high temperatures and the efficiency of steel deformation and be conducive to the control of process and the improvement for the accuracy of deformation. According to the actual needs of electromagnetic force assisted line heating process, the design ideas of circuit for the electromagnetic force assisted line heating device (EFALHD) and functions of the branch circuits are introduced. The distribution of the electromagnetic force and parameters’ influence rules are analyzed by building magnetic field and circuit coupling model in ANSYS. By adding thermal analysis on the electromagnetic field analysis, a new method of line heating finite element analysis is established to support the parameter determinations of EFALHD.

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Li, Yong Gang, and Bing Han. "Magnetic Field Finite Element Analysis of Generator with Rotor Inter-Turn Short-Circuit Fault." Applied Mechanics and Materials 707 (December 2014): 343–47. http://dx.doi.org/10.4028/www.scientific.net/amm.707.343.

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Rotor inter-turn short-circuit is a common fault in generator and it is a research hotspot to identify the fault at its early stage. Considering the disadvantage of circuit analytical method, this paper establishes a 2D transient finite element electromagnetic-circuit coupling model, and calculates the magnetic field at normal and fault situations through the powerful post-processing function of ANSOFT, then magnetic flux density cloud pictures and air-gap magnetic flux density curves of different operating conditions are got. Using MATLAB to analyze and deal with the air-gap flux density cures, we can get the differences of faults in different levels and different positions, which provide a basis for further study of rotor inter-turn short-circuit fault.

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POROD, WOLFGANG, GYÖRGY CSABA, and ÁRPÁD CSURGAY. "THE ROLE OF FIELD COUPLING IN NANO-SCALE CELLULAR NONLINEAR NETWORKS." International Journal of Neural Systems 13, no. 06 (December 2003): 387–95. http://dx.doi.org/10.1142/s0129065703001728.

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We review some of our previous work on field-coupling in nano-scale cellular arrays. Electronic devices based on metallic and magnetic nanoscale dots and molecular structures have been suggested, however, no technologically viable architecture for nanoelectronic circuit integration has emerged so far. A natural architecture on the nanoscale appears to be near-neighbor cellular networking, and we explore promising alternative ways of integrating nanodevices by direct physical field coupling, i.e. either by Coulomb or by magnetic interactions. We review new architectures for such field-coupled nanocircuits.

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Dongliang Sun and Qunhua Dong. "Cable Steady-State Ampacity Correction Method based on Multi Physical Field Coupling Algorithm." Electrotehnica, Electronica, Automatica 70, no. 2 (May 15, 2022): 19–27. http://dx.doi.org/10.46904/eea.22.70.2.1108003.

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The difference between the single air laying ampacity test value of medium voltage power cable and the system ampacity of three-phase laying and operation is a common problem in the industry. Based on the TICW-2012 standard, the single cable ampacity of medium voltage single core power cable is tested, and the COMSOL basic simulation model is debugged with the measured ampacity value. On the premise of correct single cable basic simulation model, the system ampacity under three-phase operation under different working conditions is calculated, including triangular laying, plane laying, single circuit and double circuit laying, The difference and correction coefficient between the test current carrying capacity and the of single air laying of medium voltage single core power cable are further analysed. Finally, the analytical formula is derived through the cable ampacity equivalent thermal circuit diagram, and the cable samples are theoretically analysed and calculated. According to the ampacity calculation results of single loop triangular laying and plane laying, the correctness of the simulation results is verified. This study provides a reference basis for the current carrying capacity test and correction of medium voltage power cable in the future, and also provides an effective method for the actual operation state analysis of medium voltage power cable.

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Rahim, Arbab, Carlo Ragusa, and Omar Khan. "Computation of Two-Port Parameters in Magnonic Devices Through Circuit-Field Coupling." IEEE Transactions on Magnetics 53, no. 4 (April 2017): 1–4. http://dx.doi.org/10.1109/tmag.2016.2627498.

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Journal articles on the topic 'Field circuit coupling'

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