Forces in a 3D magnetic field of conducting current contours

The present paper deals with 3D magnetic field analysis of conducting current contours. The magnetic field and forces were calculated analytically and by FEM applying the Comsol Multiphysics package. Forces were calculated by the Maxwell stress tensor and by volume force density. Numerical results for real and ideal contours with the same linear dimensions are discussed. Comparison between analytical and numerical data shows satisfactory agreement

Study of Low Frequency Electric Field Treatment of Granular Materials

The aim of the work is precise investigation of low frequency electrical field treatment of natural granular materials (seeds and grains). The components of electric field strength, current density, power losses and mechanical force along the surface of the grain have been obtained and estimated. The theoretical approach is based on AC conduction theory. The local models of each elementary grain region accounted simultaneously for the dielectric system dispersion and conductive system contributions. The field distribution has been studied using the finite element method and QuickField 5.6 software package

Investigation of the Temperature Field Distribution in an EI Type Iron-Cored Coil Using 3D FEM Modeling at Different Load Conditions

In this present paper, results for the temperature distribution in electromagnetic construction in the form of coil coupled with EI-type ferromagnetic core are presented. This construction is typical for small electric transformers (AC operation mode) or chokes—DC or AC operation mode. Investigation has been provided using 3D finite element method computer modeling at various load conditions to simulate power dissipation both in the coil and the core volumes. The results obtained were used to calculate overall thermal resistances toward ambient free air and the thermal resistance between the coil and the core. These results show the important role the thermal resistance between the coil and the core may play for both steady-state and transient device operation

Theoretical Model of Electromagnetic Flowmeter, Verification and Sensitivity Increasing

The paper deals with the analytical correlation between the obtained polarization voltage and the dielectric fluid velocity through the circular cross section of the polarization transducer. The aim is verification of the analytical results by the comparison of the analytically calculated voltage between the electrodes and its numerically obtained value applying FEM (QuickField 5.6). As the result of the inverse problem solution (Response Surface Methodology, Design of Experiments and Flexible Tolerance Method) the optimal constructive parameters and the exciting magnetic field distribution are determined guarantying maximal outgoing signal and consequently increasing the device sensitivity

Modeling of electric and heat processes in spot resistance welding of cross-wire steel bars

The aim of this work is the modeling of coupled electric and heat processes in a system for spot resistance welding of cross-wire reinforced steel bars. The real system geometry, dependences of material properties on the temperature, and changes of contact resistance and released power during the welding process have been taken into account in the study