scholarly journals Analysis of magnetic fields of electrical devices based on their circuit models

2021 ◽  
Vol 11 (1) ◽  
pp. 7-11
Author(s):  
Vsevolod Horyachko ◽  
◽  
Orest Hamola ◽  
Taras Ryzhyi ◽  
◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Mathematical Models ◽  
Electric Machines ◽  
Physical Parameters ◽  
Design Features ◽  
Magnetic Systems ◽  
Magnetic Circuits ◽  
Electromagnetic Devices ◽  
Electrical Devices ◽  
Lumped Elements

he article deals with an analysis of magnetic fields of electric machines and electromagnetic devices on the basis of their circuit mathematical models. The magnetic systems of electrical devices in these models are presented in the form of planar nonlinear magnetic circuits with lumped elements. The parameters of these elements are determined on the basis of geometric dimensions taking into account the design features of the devices and the physical parameters of the environment.

A FINITE ELEMENT METHOD FOR MODELING OF ELECTROMAGNETIC PROBLEMS

2020 ◽  
pp. 25-31
Author(s):  
Vuong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Magnetic Flux Density ◽  
Analytic Method ◽  
Electrical System ◽  
Electromagnetic Problems ◽  
Magnetic Circuits ◽  
Electromagnetic Devices ◽  
Electrical Devices ◽  
Element Method

Electromagnetic devices are present everywhere in our daily life. In particular, they extremely play an important role  in the fields of the electrical system. Therefore, the modeling and analyzing the electromagetic problems become currently a matter of concern and topicality for researchers and designers of electrical devices. This paper introduces a finite element method to compute accurate distributions of leakage and fringing fluxes with air-gap variations, and eddy current losses of the magnetic circuits, that cannot generally be solved by a direct analytic method. The method is approached for the magnetic flux density formulation.

Forces Exerted on a Hovercraft by a Moving Pressure Distribution: Robustness of Mathematical Models

2006 ◽  
Vol 50 (01) ◽  
pp. 38-48 ◽  
Author(s):  
Gregory Zilman
Keyword(s):  
Free Surface ◽  
Mathematical Models ◽  
Pressure Distribution ◽  
Constant Pressure ◽  
Wave Resistance ◽  
Excess Pressure ◽  
Physical Parameters ◽  
Rectangular Region ◽  
Heavy Fluid ◽  
Side Force

The wave resistance, side force, and yawing moment acting on a hovercraft moving on the free surface of a heavy fluid is studied. The hovercraft is represented by a distributed excess pressure. Various types of pressure and bounding contours are considered. The sensitivity of the results to numerous uncertainties in the problem's physical parameters is investigated. It is found that constant pressure over a rectangular region moving with an angle of drift results in peculiar side force values. Several robust mathematical models of a moving hovercraft are proposed and analyzed.

Applied Power Electronics

2020 ◽  
pp. 362-407
Author(s):  
Carlo Joseph Makdisie ◽  
Marah Fadl Mariam
Keyword(s):  
Power Electronics ◽  
Speed Control ◽  
Dc Motor ◽  
Electric Machines ◽  
Control Methods ◽  
Power Losses ◽  
Electromagnetic Devices ◽  
Speed Regulation ◽  
Classical Control ◽  
Methods Of Control

Most of the electric machines had a conventional design for speed –control. Previously, the speed regulation of these motors was done via traditional or mechanical contacts, for example: inserting resistors to the armature circuit or controlling the excited circuit of DC motor, and other methods of control. These classical methods, however, lead to non-linearity in mechanical or electromechanical characteristics [ω= f(M) or ω= f(I)], which in turn lead to increased power losses as the result of the non-soft regulation of speed, as well as the great inertia of classical control methods that rely on mechanical and electromagnetic devices.

Numerical Study of Natural Convection in Vertical Cylindrical Annular Enclosure Filled with Cu-Water Nanofluid under Magnetic Fields

2019 ◽  
Vol 392 ◽  
pp. 123-137 ◽  
Author(s):  
Mohamed A. Medebber ◽  
Abderrahmane Aissa ◽  
Mohamed El Amine Slimani ◽  
Noureddine Retiel
Keyword(s):  
Natural Convection ◽  
Magnetic Fields ◽  
Volume Fraction ◽  
Numerical Study ◽  
Physical Parameters ◽  
Cold Temperatures ◽  
Simpler Algorithm ◽  
Wide Range ◽  
Nanoparticles Volume Fraction ◽  
Volume Method

The two dimensional study of natural convection in vertical cylindrical annular enclosure filled with Cu-water nanofluid under magnetic fields is numerically analyzed. The vertical walls are maintained at different uniform hot and cold temperatures, THand TC, respectively. The top and bottom walls of the enclosure are thermally insulated. The governing equations are solved numerically by using a finite volume method. The coupling between the continuity and momentum equations is effected using the SIMPLER algorithm. Numerical analysis has been carried out for a wide range of Rayleigh number (103≤Ra≤106), Hartmann number (1 ≤Ha≤100) and nanoparticles volume fraction (0 ≤φ≤0.08). The influence of theses physical parameters on the streamlines, isotherms and average Nusselt has been numerically investigated.

scholarly journals Design of X-Bandpass Waveguide Chebyshev Filter Based on CSRR Metamaterial for Telecommunication Systems

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 101 ◽  
Author(s):  
Mahmoud AbuHussain ◽  
Ugur C. Hasar
Keyword(s):  
Coupling Effect ◽  
Parallel Line ◽  
Split Ring Resonator ◽  
Center Frequency ◽  
Physical Parameters ◽  
Complementary Split Ring Resonator ◽  
Lumped Elements ◽  
Waveguide Filter ◽  
Chebyshev Filter ◽  
Fifth Order

This paper presents a new design of a fifth order bandpass waveguide filter with Chebyshev response which operates in the X-band at 10 GHz center frequency. By using a complementary split ring resonator (CSRR) upper and lower sections that are placed on the same transverse plane and are not on the same parallel line, CSRR sections are shifted from each other. A simple model of lumped elements RLC is introduced and calculated as well. The model of the proposed bandpass waveguide filter is synthesized and designed by using computer simulation technology (CST). Hereafter, by selecting proper physical parameters and optimizing the overall CSRR geometrical dimensions by taking into consideration the coupling effect between resonators, a shortened length of the overall filter, and a wider bandwidth over the conventional one are obtained. As a result, the proposed filter is compared with the conventional bandpass waveguide filter that is coupled by inductive irises with Chebyshev response, in addition to other studies that have used the metamaterial technique. The proposed filter reduces the overall physical length by 31 % and enhances the bandwidth up to 37.5 % .

On Magnetic Circuits in Dynamo and Magneto Electric Machines.—No. 2

1880 ◽  
Vol 9 (230supp) ◽  
pp. 3656-3657
Author(s):  
Lord Elphinstone ◽  
Charles W. Vincent ◽  
G. G. Strokes
Keyword(s):  
Electric Machines ◽  
Magnetic Circuits
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