Geometric Formulation of Edge and Nodal Finite Element Equations in Electromagnetics

Finite element equations for electromagnetic fields are examined, in particular nodal elements using scalar potential formulation and edge elements for vector potential formulation. It is shown how the equations usually obtained via variational approach may be more conveniently derived using integral methods employing a geometrical description of the interpolating functions of edge and facet elements. Moreover, the resultant equations describe the equivalent multi-branch circuit models

On the equivalence of finite difference and edge element formulations in magnetic field analysis using vector potential

Numerical three-dimensional formulations using vector potential A are examined for magnetic fields, with emphasis on the finite-difference (FDM) and edge-element (EEM) methods. It is shown that for hexahedral elements the FDM equations may be presented in the form similar to the FEM equations, providing the products of the nodal potentials and distances between the nodes are used as unknowns in FDM, instead of the usual nodal potentials

2D versus 3D electromagnetic field modelling in electromechanical energy converters

The paper provides comparative analysis between 2D and 3D numerical modelling of electromechanical devices by considering typical errors arising when 2D models are assumed to model 3D fields. It is argued that modelling simplifications need to be applied with great care as associated errors are not always predictable. In hierarchical design both types of models are desirable hence balancing accuracy and computational effort is an increasingly important issue

Strategies for two-dimensional and three-dimensional field computation in the design of permanent magnet motors

This study discusses strategies for the design of permanent magnet motors (PMMs) exploiting two-dimensional (2D) and 3D field models. Five most common methodologies are compared and errors arising from 2D classical models considered. Examples comparing 2D and 3D results are presented and discussed for two selected types of motors. An approach has been put forward which allows the accuracy of classical 2D models to be improved by introducing correction coefficients arising from preliminary 3D simulations. A possibility of employing quasi-3D models has also been explored for the design and analysis of PMMs with the stator and rotor lamination packets of different lengths. Comparative analysis of results has been provided arising from the 2D and 3D models for a classical and a double rotor PMM

Strategies for two‐dimensional and three‐dimensional field computation in the design of permanent magnet motors

This study discusses strategies for the design of permanent magnet motors (PMMs) exploiting two-dimensional (2D) and 3D field models. Five most common methodologies are compared and errors arising from 2D classical models considered. Examples comparing 2D and 3D results are presented and discussed for two selected types of motors. An approach has been put forward which allows the accuracy of classical 2D models to be improved by introducing correction coefficients arising from preliminary 3D simulations. A possibility of employing quasi-3D models has also been explored for the design and analysis of PMMs with the stator and rotor lamination packets of different lengths. Comparative analysis of results has been provided arising from the 2D and 3D models for a classical and a double rotor PMM

Melatonin as an effective pharmacocorrector of alimentary obesity resulting from a long-term excessive intake of palm oil

In the modern world, the problem of alimentary obesity is becoming one of the global problems affecting all countries. Desynchronosis of bodily rhythms is another possible cause of development of alimentary obesity and metabolic syndrome. Thus, the purpose of this research was to study the influence of melatonin on the dynamics of body weight in rat

DIGITAL TRANSFORMATION OF HOUSING AND COMMUNAL HOUSEHOLD IN RUSSIA

The transition of the Russian economy to the electronic exchange of data in the sphere of housing and communal household is described. The influence of the system of public administration, namely the program «Digital Economy of the Russian Federation». This program has been designed to introduce electronic data interchange for the sphere of housing and communal household since the automation of data collection of utility meters and utility payments is able not only to save considerable amounts of budget, but also to provide reliable impartial accounting of consumption of communal resources. The development of the life of the population has been predicted with the continuing urbanization of society. The strengths and weaknesses of urban infrastructure development are revealed. The aspects of introduction of the digital management model are presented as the only affordable and economically justified way of building the housing and communal household in the future

PROBLEMS OF FINANCING INNOVATIVE ACTIVITY IN RUSSIA AT THE PRESENT STAGE

Innovations are an integral part of the economic development not only of individual enterprises, but also of the country as a whole. In this regard, it is important to allocate properly financial resources aimed at maintaining and developing innovative activities. Searching and selection of methods for financing innovations should be carried out taking into account external and internal factors, the neglect of which leads to a lack of financial resources and freezing projects at the initial stages for individual companies and technological, raw or financial dependence on foreign investors for the country

The effect of derivatives of tetrahydropyrido[2,1-b][1,3,5] thiadiazine on hematologic indices of rats with subacute parotitis

Objective: to study the indices characterizing the red and white hematopoiesis in a clinical blood examination in animals with a simulated inflammation process against a background of pharmacocorrection with original thiadiazine derivative