Volume 5, number 1, 2011: Print version and published papers:
ASPECTS REGARDING THE TENSIONS APPEARANCE IN ELECTRIC MACHINES SHAFT
Eleonora POP, Gherasim Solovestru DOMIDE, Olivian CHIVER, North University of Baia Mare, nora@ubm.ro
Keywords: machine, electric shaft, voltage, FEM
Abstract: The paper deals with the factors that give birth to tensions into the electrical machinery shaft. It will also highlight how each of these factors influences the induced voltage. For conducting the study we used an electromagnetic field calculation program based on the finite element method (FEM).
CONTRIBUTIONS TO THE STUDY OF THE DYNAMIC OPERATING REGIME OF AN ELECTROMAGNETIC VIBRATOR
Mircea HORGOȘ, Olivian CHIVER, Cristian BARZ, Technical University of Cluj-Napoca, North University Centre of Baia Mare, mircea.horgos@ubm.ro ; olivian.chiver@ubm.ro ; cristian.barz@ubm.ro
Keywords: electromagnet; force; polynomial interpolation
Abstract: This paper presents the results of the calculation of the maximum static force air gap dependence for a fixed magnetic circuit geometry, using the finite element method. This contributes to the writing of a dependency matrix of higher rank than that available in discrete simulation results, leading to the generation of analytic expressions of general nature and not subject to simplifying assumptions for the maximum static force of air gap variation.
PROGRAM FOR THREE-PHASE POWER TRANSFORMER DESIGN
Olivian CHIVER, Eleonora POP and Ionut BARSAN,North University of Baia Mare, Department of Electrical, Electronics and Computers Engineering, olivian.chiver@ubm.ro
Keywords: finite, elements, power, transformers, design
Abstract: This paper presents a program developed for designing three-phase power transformers used in power systems. The program was developed in Visual Basic because this programming language allows us to realize a friendly and suggestive interface with minimum effort. The second reason, which is the most important, is to use Visual Basic, because this language is recognized by the used finite elements analysis (FEA) software, MagNet produced by Infolytica. This software package is designed for calculation of the magnetic field of electromagnetic devices and machines. The 3D components of the numerical model are carried out using CATIA program, automatically, based on the calculated main geometric data.
Zoltan ERDEI, Paul BORLAN, North University of Baia Mare, Eaton Electroproduction Romania, zoltan.erdei@cunbm.utcluj.ro, borlan.paul@gmail.com
Keywords: control, fuzzy logic, fuzzy logic control
Abstract: In this paper the authors present the usefulness of fuzzy logic in controlling engineering processes or applications. Although fuzzy logic does not represent a novelty for the scientific and engineering field, it enjoys a great appreciation from those involved in the two domains. The fact that fuzzy logic uses sentences kindred with the natural language make it easier to comprehend that a complex mathematical model required by the classic control theory. In MatLab software there are dedicated toolboxes to this subject that make the design of a fuzzy controller a facile one. In the paper design methods of a fuzzy controller are being presented both in Simulink and MatLab.
A NEW FINITE ELEMENT METHOD DISCRETIZATION BASED ON DUAL FORMULATION OF MAGNETOSTATIC FIELD
Liviu NEAMT, Emil MICU, North University of Baia Mare, liviu.neamt@ubm.ro
Keywords: Finite Element Method, Meshing, Magnetostatic field
Abstract: The meshing techniques are very important for the economy and the precision of a Finite Eelment Method (FEM) analysis. The presented algorithm for the discretization of a magnetostatic plane parallel configuration is based on dual formulation of magnetostatic field and generates, in iterative steps, a final mesh which is very close to the magnetostatic spectrum, magnetic field lines and equipotentials lines for scalar magnetic potential.