ELEKTRONIKA, ENERGETYKA, ELEKTROTECHNIKA ›
PRZEGLĄD ELEKTROTECHNICZNY ›
2007-11 |
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A multiobjective approach to the shape design of HTSC magnetic bearings
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Paolo DI BARBA  Ryszard PAŁKA
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The shape design of the excitation system of a high-temperature-superconductor (HTSC) magnetic bearing is revisited in terms of
multiobjective design. It is proven how the concept of non-dominated solution, helps the designer to represent the feasible region in the objective
space and identify its boundary. At the end of the proposed design procedure, a set of optimal geometries of the device - [...]
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Classification method for linear model of alternator
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Konrad SKOWRONEK Artur WOŹNIAK
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The paper presents an attempt to implement the classification method for linear diagnostic model of alternator. Method basis on the signal
feature extractions, with the use of frequency methods, with selection of the variables basis on Principal Component Analysis (PCA) and linear
discrimination analysis (LDA). The consideration has been carried out on the grounds of the faults of a bridge-recti[...]
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Computer vision in parallel computing
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Michał PODPORA
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Computer vision is known to be a CPU power consuming task. Real-time video capturing, filtering and converting take so much time that
creating a substantial artificial intelligence algorithm seems to be unrealisable. In this article author considers using a cluster in a computer vision
project, advantages and disadvantages of this solution. He explains some ideas about minimization of amount of [...]
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Concept of mapped Infinite Elements incorporated into Boundary Element Method
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Maciej PAŃCZYK Jan SIKORA
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Incorporation of Infinite Elements into Boundary Element Method (BEM) requires to introduce special mapping functions or combination of
standard shape function and decay functions for infinite region. The concept of mapped infinite elements usage and their implication for calculation
steps in BEM will be presented. Results will be illustrated by two-dimensional example. It is to clarify the appl[...]
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Conversion of Hammerstein models in electrical systems
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Piotr ŚWISZCZ Janusz WALCZAK
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A method of reduction and decomposition of complex models of nonlinear systems into simple form has been proposed in this article.
Properties of the Wiener and Hammerstein models have been used in described algorithms. This algorithm can be used for simplification and
significant reduction of the time of symbolic operations made by known calculation packages, e.g.: Mathematica and Matlab.
Stres[...]
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Coreless axial flux PM machine with two external rotors
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Piotr CIERZNIEWSKI
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The paper presents construction and principles of operation of coreless axial flux PM machine. In this construction new solution of stator
windings- mounting was used, that allowed to exploit active parts of machine more efficiently. There was also presented three dimensional model of
the machine and its parameters and characteristics obtained due to simulation. Results of this simulation [...]
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Diabetic supervision system
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Ryszard SIKORA Kamil ŚWIADEK Wojciech RUCIŃSKI
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Following article treat about creation of remote supervision system for diabetic. Main purpose of this system is to help to maintain the
proper insulin level. Remote supervision will be used to achieve regular medical control without hospital visiting. System will be prepared for
immediate implementation.
Streszczenie. Prezentowany artykuł opisuje tworzenie systemu zdalnego nadzoru nad chorymi [...]
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Disc-type permanent magnet electrical machines
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Anatolij AFONIN
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Various approaches to combined magnetic system designs with permanent magnet segments and ferromagnetic field concentrators have
been proposed and analyzed. It has been shown, that the application of combined magnetic systems allows increasing both the magnetic, and electrical
loads of electrical machines. This is the basis for development of unconventional electrical machines with increased pow[...]
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Fluxgate sensor based on a special ring core made of nanocrystalline metal ribbons
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Stanisław MOSKOWICZ
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In the paper the design and results of tests carried out on a fluxgate-based compensating sensor of magnetic field intensity built around a
ring core made of Finemet type ribbon are presented. The core is featured by radially and regularly arranged holes. Such a design makes it possible
to magnetize portions of the core by coiling magnetizing windings and creating a virtual gap.
Streszczenie. W[...]
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Graphical model editing for 3D electromagnetic devices
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Jarosław WENCEL Piotr KATARZYŃSKI Adam TURKOT
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The paper presents an application designed for rendering and editing discrete models for PROFI System. There are shortly described the
principles of modelling in the mentioned software system, as well as the requirements for creating a model representation. The authors proposed the
interface for the mentioned application that will combine different approaches to model edition. This paper is focu[...]
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Innovative magnetic systems of electrical machines
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Anatolij AFONIN
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Results of research on magnetic systems of electrical machines with outer, inner and double rotor are presented. The approaches to
combined magnetic system design with changing magnetization vectors of permanent magnets have been proposed. Magnetic systems allow
realizing the sinusoidal or trapezoidal waveform of the magnetic field distribution in the air gap of cylindrical type electrical machi[...]
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Interactive framework for modeling and analysis
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Peter FABO Andrea SIROKA Dusan MAGA Peter SIROKY
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In this paper the interactive simulator will be presented. The main emphasis is put on methods of simulation implemented into this
simulator platform. Three kinds of simulation methods will be described. The first method is discrete simulation in real time or virtual time, the second
is simulation controlled by events and the last is single-step and multi-step method.
Streszczenie. W artykule t[...]
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Magnetoelastic methods principle and practical applications
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Peter FABO Peter SIROKY
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The hysteresis loop is the basic characteristic of a ferromagnetic material. Further magnetic properties, such as the total and incremental
permeability in working point, can be deduced from the hysteresis loop. Some applications of magnetoelastic method will be presented too.
Streszczenie. Pętla histerezy jest podstawową charakterystyką materiału ferromagnetycznego. Pozostałe własności, takie j[...]
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Minimization of torque pulsation in slotted PM machines with magnetic wedges
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Marcin WARDACH
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The paper presents chosen results of magnetic circuit in electrical machines with permanent magnets simulating research. In this circuit
the magnetic wedges which close slots with windings have been provided. In analyzed structure of magnetic circuit first wedge's magnetic
permeability have been changed and then electromagnetic and cogging torque value have been examined. Because of that a[...]
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Optimization of electric field in contacts on example of making switch
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Stanisław KULAS Łukasz KOLIMAS
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The environment of insulating system in which making switch functions is air and atmospheric pressure. Air is applied as isolation and as
extinguisher. The object of theoretical analysis of the area of insulating contact system is to assess a diversity of electric field in contact gap. The aim
of theoretical analysis is to find in making switch, areas which have the biggest sensitivity to breakd[...]
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Probabilistic representations of active currents
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Dariusz GRABOWSKI Janusz WALCZAK
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An optimization method for active current determination in the case of systems with stochastic waveforms has been proposed in the paper.
The active current for an ideal and non-ideal source-load system in which current is a normal stochastic process has been calculated. The results
have been analyzed and their interpretation has been given. Theoretical considerations have been illustrated by an [...]
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Properties of different representations of electroretinograms
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Tomasz ROGALA Andrzej BRYKALSKI
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This paper discusses an application of classification algorithms for electroretinogram identification. These signals are 1-D electrical responses
of human retina for a light stimulus and are used in ophthalmology for diagnostic purposes. The authors studied the application of multilayer
perceptrons (MLP) for distinction between healthy and pathological recordings. Three different representations[...]
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Reduction of eddy current losses by 2D-segmentation
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Meinolf KLOCKE
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The paper discusses the influence of a combined longitudinal and transversal segmentation of magnetic cores on eddy current losses
based on an analytical solution of the underlying partial differential equation in the time-harmonic regime. Such a segmentation is often used for
permanent magnets in brushless synchronous machines in order to reduce losses generated by field harmonics of higher fre[...]
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The estimation time of life and time of health for Ni-MH accumulator
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Konrad SKOWRONEK Piotr SZYMKOWIAK
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In this paper a new method of estimating time of work for Ni-MH accumulator were proposed. In comparison with other solutions this
method works quite well without historic data of charge and discharge characteristics.
Streszczenie. W artykule zaproponowano nową metodę estymacji czasu pracy ogniwa typu Ni-MH. W porównaniu z innymi rozwiązaniami metoda
ta daje lepsze rezultaty przy braku danych h[...]
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The method for identification of fotocell in real time
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Konrad SKOWRONEK Grzegorz TRZMIEL
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This paper describes the adaptation of the modified method of opinion the residuums in identification of state the photovoltaic cell. It was
introduced the "window classifier" of conditions of work the tested the photovoltaic module as well as define the liminal coefficient of efficiency.
Comparison got residuum with acceptable coefficient allow on effective opinion of state photo-cell in [...]
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The position transducers with magnetic microsensors
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George CĂRUNTU Cornel PANAIT
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The present paper proposes an original solution to increase the efficiency of cardamic suspension which ensures the stabilization of
horizontal position for gyrocompass and radar antenna. Two platforms that can spin simultaneously, but independent of each other, driven by two
direct current reversible motors are used. The signals that determine the value of the engine supply voltage are given by[...]
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Time-scaling of SISO and MIMO discrete-time systems
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Bogdan GRZYWACZ
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The idea for time-scaling of output signals of linear and nonlinear SISO and MIMO discreet-time systems has been presented. It is shown,
that algorithms for SISO discrete-time systems can be useful for scaling of MIMO ones, if so-called V-model of MIMO system can be determined and
its SISO components can be scaled separately by equipping them with correctors processing the associated state varia[...]
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ZnO thin film deposition with pulsed magnetron sputtering
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Jan ZIAJA
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In this work, the pulse magnetron sputtering was applied to Zn-Bi-O thin films deposition. It was proved that the rate of metal target
sputtering with argon model plasma was highest when using DC-M bias, while reactive sputtering of metal or oxide targets was most effective in the
case of AC-M mode of biasing. The rates of material depositions were comparable or higher than those achievable with[...]
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