On the basis of initial assumptions, a mathematical model that describes electromechanical processes in a brushless DC electric motor with a salient-pole stator and is created.

Use of the terms "energy", "active power", "reactive power" for power supply systems with semiconductor converters and energy storage is substantiated. Techniques for calculating energy efficiency of these systems are presented.

A problem of inactive power compensation in a three-wire three-phase network under asymmetrical sinusoidal voltage is considered. An algorithm for calculating susceptance of a compensator for the total current component active power of which equals zero is introduced. Examples of calculation are given.

Multiphase windings are shown to form three types of homology. A bipolar winding homology formation algorithm is developed. Change in electromagnetic properties of the windings forming a homologous series proves to uniquely comply with the law of the winding series structure transformation. Through application of the compliance specified, an automated three-phase winding synthesis and harmonic analysis subsystem is designed.

The paper presents results of computer simulation and experimental study of magnetic induction distribution in a coaxial linear motor air gap throughout the length of the runner active part at different heights of the air gap between the runner and the inductor magnetic core for motors with axial and radial direction of the permanent magnets magnetization.

To improve the performance of primary data processing algorithms when determining frequency in problems of mathematical modeling and operation control of electrical systems, it is proposed to represent discrete instantaneous values of operating mode parameters by their generalized vectors.

For a spatial three-phase axial electromagnetic system with double-contour phase elements of the twisted butt-end magnetic core, analytical dependences for optimal geometrical relations determination over minimum active part weight and cost criteria are obtained, advantages of the core elements hexagonal cross-section configuration shown.

Analysis and research into properties and parameters of different-type laminated magnetic cores of three-phase power transformers are conducted. Most of new laminated magnetic core designs are found to have significant shortcomings resulted from design and technological features of their manufacturing. These shortcomings cause increase in ohmic loss in the magnetic core, which eliminates advantages of the new core configurations and makes them uncompetitive as compared with the classical laminated magnetic core design.

Calculations of electrical network currents can be performed with four law systems, namely, Kirchhoff laws, under current limitation via electrical parameters and constant or variable network topology; "alpha" and "beta" laws, under current limitation via network arms transmission capacity.

A brief scientific and historical essay on the history of designing rocket technology and exploring near and outer space around the Earth is given.

The analysis of the turbogenerators’ TВВ-1000-2Y3 failure has shown that the most vulnerable link in the stator is such of their elements as tightening prisms, the teeth of the end packet core, lead-out and connecting buses of the stator winding. The basic reason for the destruction of the elements mentioned is metal fatigue caused by excessive vibration under the influence of variable axial forces of electromagnetic origin. Preventing the destruction of the structural elements may be achieved by vibration monitoring and diagnostics.

The paper introduces a modified criterion of reduced costs that employs coefficients of operation significance and priority of ohmic loss accounting to allow matching maximum efficiency with minimum reduced costs. Impact of the inflation factor on the criterion of reduced costs is analyzed.

The analysis made has shown expediency of modernization rather than reconstruction of earth electrodes, after inspection of long operating substations grounding grids, via building a two-level structure. It will result in both technical and economic effects. The novelty of the results consists in studying, by means of a mathematical model, electrical characteristics of a two-level earth electrode versus the depth of surface soil drying or freezing.