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1

Improved algorithm for periodic steady-state analysis in nonlinear electromagnetic devices

Sobczyk T. J., Radzik M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2019

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Vol. 67, nr 5

863--869

EN

This paper presents the improved methodology for the direct calculation of steady-state periodic solutions for electromagnetic devices, as described by nonlinear differential equations, in the time domain. A novel differential operator is developed for periodic functions and the iterative algorithm determining periodic steady-state solutions in a selected set of time instants is identified. Its application to steady-state analysis is verified by an elementary example. The modified algorithm reduces the complexity of steady-state analysis, particularly for electromagnetic devices described by high-dimensional nonlinear differential equations.

2

A novel adaptation approach for electromagnetic device optimization

Ouyang J., Lowther D.

Archives of Electrical Engineering

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2011

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Vol. 60, nr 4

473-483

EN

The ability of case-based reasoning systems to solve new problems mainly depends on their case adaptation knowledge and adaptation strategies. In order to carry out a successful case adaptation in our case-based reasoning system for a low frequency electromagnetic device design, we make use of semantic networks to organize related domain knowledge, and then construct a rule-based inference system which is based on the network. Furthermore, based on the inference system, a novel adaptation algorithm is proposed to derive a new device case from a real-world induction motor case-base with high dimensionality.

3

Modeling of Dynamic Regimes of Electromechanical Devices Using Semi-Field Methods

Maday V., Musykhina N.

Przegląd Elektrotechniczny

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2010

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R. 86, nr 1

98-99

EN

Complex mathematical model intended for calculation of transient processes and steady-state regimes based on combination of electromagnetic circuit’s theory and methods of electromagnetic field analysis is proposed. Proposed model makes it possible to estimate spatialtime distribution of magnetic field and magnetic induction vector.

PL

W artykule zaproponowano złożony model umożliwiający symulację stanów nieustalonych i ustalonych przez połączenie modeli obwodowych i polowych. Model umożliwia rozkład czasowy i przestrzenny pola magnetycznego.

4

Analysis of dynamics of a non-linear actuator model coupling a field -- circuit -- motion calculation with optimal control

Stępień S.

Journal of Applied Computer Science

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2009

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Vol. 17, nr 1

107-116

EN

Finite element - based simulation of the single – phase electromagnetic actuator control is presented including 3D electromagnetic field, circuit and movement model coupling to optimal control. The subject of this paper is to study an optimal control technique that minimises quadratic energy function in electric circuit. As a new contribution the algorithm based on Linear Quadratic Problem coupled with non-linear electromagnetic actuator model in closed – loop control system is proposed. The paper presents magnetic non-linearity impact on control and device dynamics.

5

Przetworniki elektromagnetyczne z cieczą magnetyczną

Szeląg W.

Zeszyty Naukowe Politechniki Poznańskiej. Elektryka

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2006

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Nr 51

65-84

PL

W artykule przedstawiono ciecze reologiczne o właściwościach sterowanych polem magnetycznym oraz wskazano ich zastosowania w przetwornikach elektromagnetycznych. Zaprezentowano przetworniki opracowane na Politechnice Poznańskiej. Do analizy stanów pracy przetworników z cieczą magnetyczna zaproponowano model polowy nieustalonych zjawisk sprzężonych: elektromagnetycznych, hydrodynamicznych, cieplnych oraz mechanicznych. Przedstawiono opracowany algorytm i program symulacji zjawisk sprzężonych w hamulcach magnetoreologicznych. Zaprezentowano wybrane wyniki symulacji i badań hamulca modelowego.

EN

The paper deals with magnetic fluids whose properties change in the presence of a magnetic field and shows how they can be applied in electromagnetic transducers. The electromagnetic brakes and dampers with magnetorheological fluid made in Poznań University of Technology has been shown. A field model of coupled electromagnetic, hydro-dynamic, thermodynamic and mechanical motion phenomena in brake with magnetic fluid is presented. The numerical implementation of the mathematical model is based on the finite element method and a step-by-step algorithm. Saturation, eddy currents, rotor movements, non-linear properties and the flow of the fluid have been taken into account. A computer program based on this algorithm was used to simulate the transients in a prototype of magnetorheological brake. The results of the calculations and measurements are presented.

6

Nagrzewanie indukcyjne i elektromagnetyczne oddziaływanie na ciekłe metale - nowoczesne urządzenia i technologie, kierunki badań naukowych

Sajdak Cz.

Śląskie Wiadomości Elektryczne

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2004

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Nr 5 (56)

11--19

PL

W procesach obróbki cieplnej, przeróbki plastycznej, topienia, zgrzewania, lutowania i rafinacji metali, a także przy produkcji monokryształów i nadprzewodników oraz w wielu innych technologiach powszechnie stosowane jest nagrzewanie indukcyjne. Urządzenia elektromagnetyczne do ciekłych metali, zwłaszcza mieszadła indukcyjne, stają się nieodzownymi elementami współczesnych linii technologicznych w przemyśle hutniczym. W artykule przedstawiono ważniejsze nowe zastosowania i konstrukcje pieców i nagrzewnic indukcyjnych oraz urządzeń elektromagnetycznych do ciekłych metali. Omówiono również podstawowe kierunki badań naukowych w obszarze prezentowanych urządzeń i technologii.

EN

Induction heating is commonly applied in the processes of heat treatment, plastic working, melting, welding, soldering and metal refining as well as when producing monocrystals, and superconductors, and many other technologies. Electromagnetic devices used for liquid metals, especially induction stirrers become indispensable elements of modern technologies in metallurgical industry. The paper presents some new applications and constructions of induction furnaces and heaters and electromagnetic devices used for liquid metals. Basic trends in the scientific research of presented devices and technologies are discussed.

7

2D numerical model of electromagnetic structures for educational purposes

Bugeza M., Fiser R.

Journal of Technical Physics

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2002

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Vol. 43, no 4

359-368

EN

The paper presents the development of a software package for static and time-variable magnetic field calculations in 2D electromagnetic structures for educational purposes. It has a simple and clear structure in order to assure students a simple tool for studying electromagnetic fields. It enables the step-by-step insight into the procedure of the pre-processor, structure of the solvers and representation of the results. The computational results are also compared with other FEM packages and have proved to be of a significant practical value in the post-graduate courses.