Technical Transactions iss. 13. Electrical Engineering iss. 3-E

Technical Transactions iss. 13. Electrical Engineering iss. 3-E

Type: Collection of magazine numbers
Release date

Collection items (21)


The method selection of control system’s parametric optimization

Samotyy, Volodymyr, Pavelchak, Andrii, Dzelendzyak, Ulyana
Article
2016
In this article the methods’ review of a control system’s parametric optimization have been performed. According to the revealed analysis, the genetic algorithms have been chosen as the most appropriate tools for these tasks. Using genetic algorithms, the global optimum could be identified. To demonstrate it the system’s parametric optimization, which consists of controlled three phase half wave rectifier and DC motor with independent excitation has been executed, using a classic genetic algorithm.

Data center resource management for SaaS

Telenyk, Sergii, Bukasov, Maksym
Article
2016
The paper summarizes models and methods of data center resource management for SaaS. An approach for the allocation of computing resources for single-tenant SaaS was proposed. Different cases of this problem for excess and lack of computing resources were considered. Those problems belong to the classes of linear and nonlinear Boolean programming. In order to solve the mentioned problems, heuristic and genetic algorithms have been proposed. A comparison of their effectiveness was made.

Evolutionary optimization of DC motor control system

Samotyy, Volodymyr
Article
2016
The mathematical model of a DC motor control system’s dynamic work with series impulse was designed. Control is performed by thyristor’s ignition angle changing with doubling voltage. The parametric optimization was realized by genetic algorithm. The main genetic operators were crossover and mutation.

Conversion of fuzzy queries into standard SQL queries using Oracle 11G XE

Nowakowski, Grzegorz
Article
2016
This article presents various forms of fuzzy queries with a particular emphasis of two different approaches to the representation of fuzziness, a detailed analysis of these queries and their conversion into standard SQL queries using Oracle 11g XE. The actions discussed above point out to the methods of obtaining fuzzy information from the database that have been easy to implement. A qualitative and quantitative study about the use of fuzzy queries on relational databases has been included in this article, as well. This research takes into account the fact that obtaining this type of information is not supported by any commercial database management system.

Laboratory test of surface mounted permanent magnet brushless motor

Korkosz, Mariusz, Podskarbi, Grzegorz
Article
2016
In the paper, the results of laboratory tests of a surface mounted permanent magnet brushless motor were presented. Two power electronics systems, which are made as inverters for PMSM and BLDC motors, were used. The PMSM inverter supplies the motor with sinusoidal currents and the BLDC inverter supplies the motor with trapezoidal voltage. The motor characteristics and its waveforms were determined when the motor was supplied from the BLDC inverter and the PMSM inverter. A comparison of the influence of the motor supply method on its features and parameters was performed.

Preventing the formation of ice on the catenary lines

Hudym, Vasyl, Jagiełło, Adam, Prusak, Janusz, Chrabąszcz, Ireneusz, Trębacz, Paweł
Article
2016
Atmospheric icing on traction lines is very important problem because it causes difficulties of using electric vehicles by people and can result to breaking of traction lines. Heating the wire can preventing atmospheric icing.

Analysis of energy-saving structures of electric machines for domestic drive

Bogusz, Piotr, Korkosz, Mariusz, Prokop, Jan
Article
2016
In the paper, alternative technologies of electric machines for domestic appliances were discussed. Nowadays, domestic appliances are used on a mass scale. In most households, there are domestic appliances where electric machines are used. Commutator motors are generally used in domestic appliances due to low costs of production. This is one of their few advantages, whereas to their disadvantages can include low energy efficiency and durability, which is limited by the sliding contact of brush-commutator. In consequence, devices equipped with these motors have low efficiency of energy conversion and are very often unreliable. In recent years, the vacuum cleaner became the receiver of relatively high power from the mains. Therefore, vacuum cleaners were covered by EU regulations. An increase of the energy efficiency of domestic appliances where electric machines are used is possible, among others, by introducing energysaving technologies in electric machines. They are characterized not only by higher energy efficiency, but also by much longer failure-free operation of domestic appliance drive.

Mathematical model of the six electrode pulse current electric arc furnaces

Hudym, Vasyl I., Drozdowski, Piotr, Postoliuk, Andrzej, Mamcarz, Dominik
Article
2016
In the article based on the fundamental laws of physics and mathematics has been formulated mathematical model to analyze the electromagnetic waveforms in electrical power systems with non-linear loads, such as arc furnaces.

Analysis and simulation of advanced technological solutions in the field of power high-voltage direct current (HVDC) of modern aircraft in line with the trend of more electric aircraft (MEA)

Setlak, Lucjan, Ruda, Emil
Article
2016
The subject of the paper is to present innovative technological architecture of the power supply system EPS (Electric Power System) in the field of high voltage power HVDC (High Voltage Direct Current) by conducting a critical analysis of the literature as well as an analysis and simulation of its selected component in line with the trend of more electric aircraft MEA (More Electric Aircraft). The considered advanced technologies relate to the architecture of the power supply system HVDC in the high voltage 540V DC (±270 V DC) and 350 V DC, used for advanced aircraft in line with the trend of MEA/ AEA, in particular for military aircraft made by Lockheed Martin (F-22 Raptor, the JSF F-35). Based on the above, the simulation of sample components of the system architecture of high voltage power HVDC has been made, selected from the group of military aircraft in the area of more electric aircraft ’More Electric Aircraft’, which is mainly the domain of advanced military aircraft the JSF (Joint Strike Fighter) F-35 and F-22 Raptor. In the final part, the paper presents the main conclusions arising from the analysis and simulation of selected components of HVDC power system architecture in accordance with the concept of a more electric aircraft.

Influence of the magnetization direction on power losses in transformer steel sheets

Szczurek, Paweł, Mazgaj, Witold, Banach, Agnieszka
Article
2016
Calculation of power losses in transformer steel sheets is still a significant problem. In some places of cores of a three-phase transformer the flux density is not parallel to the rolling direction; it especially refers to the so-called T-points of the transformer cores. In these places magnetization curves differ from the curve measured for the rolling direction. The paper deals with hysteresis losses, eddy current and excess losses and their dependences on the direction of magnetization processes. Analysis is performed for several frequencies of the magnetization process. Measured power losses of the selected transformer steel sheets are compared with results obtained on the basis of the analytical formulas.