Analysis of Two-Dimensional and Three-Dimensional Simulation of the Disc Eddy Current Braking Device

2012 ◽  
Vol 516-517 ◽  
pp. 553-557
Author(s):  
Zhi Ding Ying ◽  
Yu Long Fang ◽  
Xin Fu Xu ◽  
Wei Sun ◽  
Yang Chu
Keyword(s):  
Mathematical Model ◽  
Electromagnetic Field ◽  
Field Distribution ◽  
Eddy Current ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Electromagnetic Field Distribution ◽  
Braking Torque ◽  
Dimensional Simulation

To analyze the variation of electromagnetic field distribution, a mathematical model of the eddy current brake (ECB) is established and the two-dimensional simulation and three-dimensional simulation are comparatively analyzed. Then the curves of the braking torque of the ECB at different speeds are obtained by the simulations. The characteristics of two-dimensional and three-dimensional simulation of the electromagnetic field of the ECB are summarized by contrasted comparative curves between simulation date and test date. The analysis is helpful to optimizing the application of electromagnetism by using software.

Electromagnetic fields and thrust-ripples calculation for segmented-secondary linear flux-switching motors

2019 ◽  
Vol 38 (1) ◽  
pp. 95-118
Author(s):  
Monir Sadat Hosseini ◽  
Hamid Javadi ◽  
Sadegh Vaez-Zadeh
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Fields ◽  
Field Distribution ◽  
Low Cost ◽  
Transportation Systems ◽  
Analytical Models ◽  
Force Density ◽  
Two Dimensional ◽  
Content Type ◽  
Electromagnetic Field Distribution

Purpose This paper aims to investigate analytical electromagnetic fields and thrust ripples representation of linear flux-switching motors with simple modulated secondary referred as segmented secondary linear flux-switching motor (SSLFSM). Design/methodology/approach SSLFSMs are applicable to transportation systems like Maglev due to their simple and consequently low-cost secondary structures and high force density. However, they have high thrust ripples that deteriorate a smooth motion in rail transportation systems. Therefore, derivation of accurate analytical models for thrust ripples minimization of the motor is essential, which is absent in the literature. In this paper, a two-dimensional analytical model is developed for this motor. The model is based on transfer relations and Fourier theory used for solving a two-dimensional boundary value problem. Certain model regions are determined by considering actual machine structure and observing specific rules. Analytical solution of Maxwell and Poison equations are then obtained in the regions. Finding Using the presented modeling method, the airgap electromagnetic field distribution and developed thrust of the motor are calculated for different positions of the motor as well as its thrust ripples. They are verified by the results obtained from finite element method. Also, the analytical results are compared with the presented experimental results. Originality/value This paper has analytically presented the airgap electromagnetic field distribution, thrust and thrust ripples of the SSLFSMs. This modeling is essential in thrust ripples minimization of the motor.

scholarly journals Features of field modeling of electromagnetic processes of trolley busbar

2021 ◽  
pp. 46-60
Author(s):  
М.І. Kotsur ◽  
D.S. Yarymbash ◽  
Yu.S. Bezverkhnya ◽  
T.Yu. Divchuk
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Field Distribution ◽  
Spatial Model ◽  
High Accuracy ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Electromagnetic Field Distribution ◽  
Electromagnetic Processes ◽  
Two Dimensional Model

Purpose. Research and analysis trolley busbar’s parameters in condition of higher current harmonic actions, with taking into account the structural features of nonlinearity of magnetic and electrical properties of materials, proximity effects, surface and external surface effects. Methodology. The researches were carried out using the electromagnetic field theory methods, the electrical circuit theory, mathematical physics, finite elements, interpolation, approximation and regression analysis. Findings. The mathematical spatial model of electromagnetic processes in a steel trolley busbar in time statement of a problem of distribution of an electromagnetic field is developed. The dependences of the distribution of equipotential lines of the resulting z-component of the magnetic potential vector along the busbar, as well as the distribution of the resulting normal component of magnetic induction and magnetic field strength in the transverse (XY) cross section at non-sinusoidal current in busbar trolleys is obtained. Along the length of the busbar, in their cross section, the magnetic field tends to a plane-parallel shape it is proved. The error of the modulus of the vector magnetic potential along the length of the busbar does not exceed 0.9-1.2%. To reduce the dimension of the problem, computational resources and calculation time, a two-dimensional plane-parallel mathematical model in the frequency setting of the electromagnetic field distribution is proposed. To take into account the nonlinear magnetic properties of steel trolleys, to determine the effective magnetization curve for the nonlinear two-dimensional problem of the electromagnetic field of the busbar it is proposed. The verification results, according to the calculated voltage drop, confirm the high accuracy of the calculation and the reliability of the obtained results (error does not exceed 1.88% ÷ 2.06%) of the two-dimensional model in the frequency setting relative to the spatial model in the problem of time-dependent electrical -magnetic field is obtained. Originality. A mathematical two-dimensional model of electromagnetic processes in the frequency formulation of the problem of electromagnetic field distribution in a trolley busbar is proposed, which takes into account design features, nonlinearity of magnetic and electrophysical properties of materials, proximity effects, surface and external surface effects, influence of harmonic current components power transmission, which allows with high accuracy and efficiency of numerical implementation to determine the parameters of the bus trolls for the corresponding values of the amplitudes and frequencies of the frequencies harmonics of the current. Practical value. Verification of the calculated voltage drop confirms the high accuracy of the calculation and the reliability of the results (error does not exceed 1.88% ÷ 2.06%) of the two-dimensional model in the frequency reference relative to the spatial model in the problem of time-dependent electromagnetic field distribution is performed.

SNOM INVESTIGATION OF THE ELECTROMAGNETIC FIELD INTENSITY AND POLARIZATION DISTRIBUTION IN THE VICINITY OF NANOSTRUCTURES

2004 ◽  
Vol 03 (01n02) ◽  
pp. 105-113 ◽  
Author(s):  
M. V. BASHEVOY ◽  
A. A. EZHOV ◽  
S. A. MAGNITSKII ◽  
D. A. MUZYCHENKO ◽  
V. I. PANOV ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Field Distribution ◽  
Near Field ◽  
Qualitative Difference ◽  
Fdtd Method ◽  
Three Dimensional ◽  
Polarization Distribution ◽  
Electromagnetic Field Distribution ◽  
Surface Steps ◽  
Gap Control

The experimental and calculated results of the investigation of electromagnetic field distribution including its polarization characteristics in the vicinity of the nanostructures are presented. The experimental investigation was realized by aperture type scanning near field optical microscopes (SNOMs) which operated in collection mode. Normal resolution which allows us to image down to 0.3 nm height surface steps was demonstrated for the shear force probe to surface gap control system of the SNOM. Theoretical computation of the electromagnetic field distribution was realized by finite-difference time-domain (FDTD) method. The experimental three-dimensional maps of intensity and polarization distribution as a result of light diffraction at nanoaperture in the metal screen, dielectric and metallized nanocylinders were obtained. The qualitative difference between the orthogonal polarized component distributions near nanoaperture was experimentally shown. The electromagnetic field concentration in the proximity of the dielectric nanocylinders was observed. This observation gives a good fit with the results of FDTD computations. A spiral type electromagnetic field distribution pattern was experimentally observed in the proximity of metallized nanocylinders, which is unexpected from both experimental and theoretical points of view.

scholarly journals High temperature machines: topologies and preliminary design

Open Physics ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 657-669 ◽  
Author(s):  
Marcin Lefik ◽  
Krzysztof Komeza ◽  
Ewa Napieralska Juszczak ◽  
Daniel Roger ◽  
Piotr Napieralski ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
High Temperature ◽  
Field Distribution ◽  
Three Dimensional ◽  
Preliminary Design ◽  
Electromagnetic Field Distribution ◽  
The Impact ◽  
Three Dimensional Simulations

Abstract The paper presents the design of a machine that can work at high temperature. The impact of various topologies and materials on electromagnetic field distribution and losses was analyzed. Two and three-dimensional simulations were carried out. The results obtained were discussed.

scholarly journals The Mathematical Model of Coupling Calculation the Electromagnetic Field and Heats of End Zone Powerful Turbogenerator

2019 ◽  
Vol 62 (1) ◽  
pp. 37-46 ◽  
Author(s):  
O. H. Kensytskyi ◽  
D. I. Hvalin ◽  
K. O. Kobzar
Keyword(s):  
Mathematical Model ◽  
Electromagnetic Field ◽  
Reactive Power ◽  
Three Dimensional ◽  
Central Zone ◽  
Shielding Effect ◽  
Design Stage ◽  
Maximum Temperature ◽  
Two Dimensional ◽  
Stator Core

A quasi-three-dimensional field mathematical model of the electromagnetic field and heat transfer processes in end zone of a powerful turbogenerator has been developed. A model is the intermediate version between two-dimensional and three-dimensional solutions and is based on the numeral calculations in transversal and longitudinal sections of turbogenerator, interconnected by a complex of boundary conditions. On the first stage, a two-dimensional field model of the electromagnetic field in transversal section of central zone of a turbogenerator is considered. Then, taking into account the field distribution in central part, the magnetic field in longitudinal section is simulated. In response to the symmetry of the machine along axial and radial directions, the calculation area of end zone is considered as a half of the rotor section along its axis and the section of the stator core tooth in the tangential direction (circumferentially). Having taken the distribution of electromagnetic parameters obtained in the load mode of the machine as the initial data, the thermal losses in the elements and nodes of the end zone are determined. As a result of solving the joint problem of calculating the electromagnetic field and heat exchange processes, the distribution of heating has been obtained not only on the surface, but also inside the structural parts of the end zone. In particular, it has been found that the maximum temperature of 97.3 °C takes place in the tooth area of the end package of the stator core. This is explained by the combined effect of the main radial field, the axial leakage flux of the frontal portions of the stator and rotor windings, as well as by the “buckling” of a portion of the main flux out of the air gap. In addition, the pressure plate shielding effect is the cause of local field concentration in the toothed zone of the end package. The presented model makes it possible as early as at the design stage to evaluate the efficiency of design solutions for the formation of the end zone of the turbogenerator stator for different load modes of the machine, including the modes of consumption of reactive power.

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