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The three original models prepared for modeling of transformers are presented taking into account criteria deduced from physical modeling of electromagnetic devices in comparison with much known growth law model The electromagnetic models, especially full model, may be applied for numerical calculation of the field during design procedure of transformers [3,4,5]).
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In the paper global modeling of complex systems is discussed. Complex systems consists of several sub-systems connected in series. To modeling the complex system a global model is created. Thus, the global model of the complex system consists of simple models, which are connected to the corresponding structure. In the process of modeling the complex system needs a global quality criterion. As the...
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Methods for obtaining maximally localised quantum states in semiconductor superlattice non-symmetrical structures applied to building quantum cascade lasers are presented in the paper. Numerical research has been based on the infinite superlattice model with Blochfunction and Wannier functions properties are widely used. A few ways to compute maximally localised quantum states are demonstrated, their...
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Issues related to parasitic effects in high power induction motors fed from the network are presented in the paper. We have described computational and measurement methods for investigating shaft voltages, bearing currents and axial fluxes. These effects rapidly lead to bearings failure. Results of our own FEM calculations and lab tests are presented. Specialised test stand with the motor rated at...
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This paper presents problems related to the design and the stability of adaptive proportional observer which is used for estimation of magnetic flux and motor speed in sensorless control systems of induction motor. The gain matrix of the observer was chosen by genetic algorithm and alternatively by pole placement method. It has been shown that adaptive proportional observer is stable if the motor...
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Among new areas of electronics the systems integrated with textile materials (textronics systems) grow particularly rapidly due to special properties like flexibility, low mass, and most of all, the possibility of integration with clothing, what guarantees their direct contact with the human body. Textronic systems can be developed by the intrinsic or external modifications of textiles and their composites...
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The article presents a real time simulation method for power converters. A discrete converter and controller model and development board with FPGA was used. For the purpose of this paper, discrete models of a buck converter, PI controller and PWM generator were designed. Real time simulation results, obtained with a programmable logic device were presented. The simulation takes into account reference...
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Fluorescent lamps are commonly used light sources Their light parameters are dependent, among other things, on the ambient conditions. Most of the research in this field is conducted by manufacturers and the results are either not published or presented selectively. The article presents the effect of ambient temperature upon luminous radiation of phosphors used for the production of low-pressure mercury...
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Three-phase current source rectifier (CSR) is becoming more popular in industry as front-end converter because its four-quadrant work and low electromagnetic interferences. However, it includes LC filter on the input side, which lowers efficiency and enhances distortions of grid currents. Impact of those disadvantages can be reduced by proper control algorithm. The purpose of this paper is to present...
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The presented paper describes the principles of cathodic protection (CP) of underground tanks using the sacrificial anode as well as method of calculation of the potential, current density and polarization distribution on all sides metallic tanks buried underground. Differential equations with boundary conditions are developed and next solved by FEM in 2D and 3D cases. The main goal of this publication...
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A novel approach to the voltage source inverters (VSI) construction is presented in the paper. The invented inverter structures allow to operate several DC/AC converters in parallel resulting in lower voltage distortions at extremely low switching frequency. The research presented in the paper describes such a parallel operation of the VSI's which is possible thanks to the use of coupled inductors...
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The paper presents current sampling frequency influence on the fuzzy corrector operation in case of 3P-3W voltage source converter. The current space vector trajectory corrected for different sampling frequency was investigated. A cases of a current trajectory deformation resulting from the asymmetry of load, non-sinusoidal modulating functions and changes in the value of the input voltage were taken...
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The paper discusses the method of solving the finite element (FE) equations that describe the magnetic field distribution for scalar and vector potential formulations. The 3D field problems have been analyzed. The nodal FEs for a scalar potential and the edge elements (EE) for a vector potential are considered. The FE equations have been described using the language of circuit theory. For selected...
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The preliminary laboratory experiments were carried out of impulse current distribution in a laboratory model of the lightning protection system. The tested system is a model in a scale of 1:5 based on the full size test house equipped with the lightning protection system and connected to a supplying electrical installation used for an open air experiments conducted for the few years. The simulated...
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In the paper, there is presented an analysis of the operation of an industrial plant medium voltage power network. The plant has several production halls with induction motors installed in them. Two generating units, with an asynchronous and a synchronous generator, are installed in this network. There was investigated the behavior of the generating units in the following transient states: step changes...
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The article presents the analysis results and the most important findings and conclusions concerning the usage of Bicpectrum Transform in the non-invasive diagnosis of induction motor, operating in a steady state. The authors evaluated the effectiveness of the bispectrum analysis application to assess the machine faults for selected signals: stator current, voltage proportional to the unipolar stream,...
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This paper presents test results related to the emission impact of illumination on selected elements of the façade of an architectural structure. The detailed tests were focused on the zone illumination of window recesses made using linear lighting fittings with LED light sources. The tests included the evaluation of the illumination fittings possibly causing light pollution in the environment outside...
