Gergely Kovács

35572083200

Publications - 10

Transformer model identification by artap: A benchmark problem

Miklós Kuczmann Gergely Kovács Attila Szöcs

Publication Name: Periodica Polytechnica Electrical Engineering and Computer Science

Publication Date: 2021-04-27

Volume: 65

Issue: 2

Page Range: 123-130

Description:

The paper presents how Artap can be used for determining the equivalent circuit parameters of a one phase transformer as a benchmark problem. The following unknown parameters of the equivalent circuit are identified: primary resistance and primary leakage reactance, secondary resistance and secondary leakage reactance, finally magnetizing resistance, and magnetizing reactance. The known quantities from measurement are the primary voltage, primary current, power factor, secondary voltage, and the load resistance. Algorithms implemented in Artap are used for determining the transformer parameters and the results are compared with the analytical solution.

Open Access: Yes

DOI: 10.3311/PPee.17606

Measuring and the hysteresis characteristics of permanent magnet

Miklós Kuczmann Gergely Kovács

Publication Name: Physica B Condensed Matter

Publication Date: 2018-11-15

Volume: 549

Issue: Unknown

Page Range: 62-68

Description:

Knowledge of the hysteresis characteristics of permanent magnets is one of the focal point of electric motor design. Permanent magnets are widely used in PMSM (Permanent Magnet Synchronous Motor) and BLDC (Brushless DC) motors that can be found in electric vehicles. The paper deals with the implementation of a permanent magnet measurement set-up as well as the finite element simulation of the developed arrangement. The purpose of this work is to realize an accurate model of permanent magnet obtained by measurement parameters.

Open Access: Yes

DOI: 10.1016/j.physb.2017.09.090

Improvement and application of the viscous-type frequency-dependent preisach model

Miklós Kuczmann Gergely Kovács

Publication Name: IEEE Transactions on Magnetics

Publication Date: 2014-01-01

Volume: 50

Issue: 2

Page Range: 385-388

Description:

Iron parts of electrical machines are made of nonoriented isotropic ferromagnetic materials. The finite element method (FEM) is usually applied in the numerical field analysis and design of this equipment. The scalar Preisach hysteresis model has been implemented for the simulation of static and dynamic magnetic effects inside the ferromagnetic parts of motors. The dynamic model is an extension of the static one; an extra magnetic field intensity term is added to the output of the static inverse model. This is a viscosity-type dynamic model. The fixed point method with stable scheme has been realized to take frequency-dependent anomalous losses into account in FEM. This scheme can be used efficiently in the frame of any potential formulations of Maxwell's equations. The comparison between measured and simulated data using a toroidal core shows a good agreement. A modified nonlinear version of T.E.A.M. Problem No. 30.a is also shown to test the hysteresis model in the FEM procedure. © 1965-2012 IEEE.

Open Access: Yes

DOI: 10.1109/TMAG.2013.2283398

Application of PETSC and other useful packages in finite element simulation

Miklós Kuczmann Dániel Marcsa Gergely Kovács György Tomozi Péter Prukner Gergely Friedl Tamás Budai Tamás Unger

Publication Name: Pollack Periodica

Publication Date: 2013-08-01

Volume: 8

Issue: 2

Page Range: 141-148

Description:

In the frame of the project TÁMOP 4.2.2.A, at the Széchenyi István University, the goal is to work out a new finite element package for the simulation and optimization of permanent magnet synchronous motors. These motors are then used to drive new electric cars. The aim of the two dimensional package is the fast numerical modeling of these electric devices by the use of free tools presented in the paper. Of course, the software is aimed to use it in the simulation of other devices, and three dimensional problems, as well.

Open Access: Yes

DOI: 10.1556/Pollack.8.2013.2.15

Comparison of the different design software tools for the brushless DC motor designing

Miklós Kuczmann Gergely Kovács

Publication Name: Pollack Periodica

Publication Date: 2013-04-01

Volume: 8

Issue: 1

Page Range: 179-188

Description:

The paper presents simulation results of a two-dimensional permanent magnet synchronous motor, which were calculated by the help of the Infolytica MotorSolve and of the COMSOL Multiphysics, as well. The simulation results were compared with each other focusing on the torque, the magnetic flux density and the magnetic potential of the permanent magnet synchronous motor.

Open Access: Yes

DOI: 10.1556/Pollack.8.2013.1.16

Solution of the TEAM workshop problem No. 7 by the finite element method

Miklós Kuczmann Gergely Kovács

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2011-01-01

Volume: 87

Issue: 3

Page Range: 99-102

Description:

This paper presents some potential formulations which can be derived from the "quasi-static" Maxwell's equations. The simulation results of the potential formulations are compared with each others focusing their CPU times and their accuracy - and with the measurement results, as well. The model -which was simulated - the TEAM workshop problem No. 7. The magnetic flux density and the eddy current were shown by the results of the simulation.

Open Access: Yes

DOI: DOI not available

Simulation and measurement of magnetic based nondestructive tester

Miklós Kuczmann Gergely Kovács

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2009-12-01

Volume: 85

Issue: 12

Page Range: 76-79

Description:

The paper presents the analysis of a nondestructive testing equipment under investigation. There are three main parts of the research as well as this paper. The first part shows the present state of the developed nondestructive tester based on the Magnetic Flux Leakage (MFL) method, the second part reviews the simulation and the results, which have been made with the principle of the Finite Element method (FEM). The last part presents the measurement results, which have been performed with the nondestructive tester. In this paper the simulation results with the measurement results have been compared.

Open Access: Yes

DOI: DOI not available

Simulation of a developed magnetic flux leakage method

Miklós Kuczmann Gergely Kovács

Publication Name: Pollack Periodica

Publication Date: 2009-08-01

Volume: 4

Issue: 2

Page Range: 45-56

Description:

The paper presents the analysis of nondestructive testing equipment under investigation. There are two main parts of the research as well as this paper. The first part shows the present state of the developed nondestructive tester based on the Magnetic Flux Leakage method, the other part reviews the simulation and the results, which have been made with the principle of the Finite Element Method. The aim now is to define the order of magnitude of the magnetic flux density in the positions of the sensor.

Open Access: Yes

DOI: 10.1556/Pollack.4.2009.2.5

Nonlinear Simulation of a Magnetic Flux Leakage Measurement System

Miklós Kuczmann Gergely Kovács

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2008-12-01

Volume: 84

Issue: 12

Page Range: 184-187

Description:

The paper presents the building up of a computer controlled measurement system based on National Instruments Data Acquisition card and National Instruments LabVIEW software package. The aim of this research is to detect surface cracks on steels by applying a Magnetic Flux Leakage (MFL) testing method. First, a finite element based procedure has been implemented to analyze the arrangement. One important question is the position of the sensors. Now, eddy currents have been neglected, but the nonlinear characteristics of specimen have been taken into account.

Open Access: Yes

DOI: DOI not available

Nonlinear finite element simulation for magnetic flux leakage tester

Miklós Kuczmann Gergely Kovács

Publication Name: Pollack Periodica

Publication Date: 2008-04-01

Volume: 3

Issue: 1

Page Range: 81-90

Description:

The paper reports about the building up a computer controlled measurement system based on National Instruments Data Acquisition card and National Instruments LabVIEW software package. The aim of this research is to detect manufactured surface cracks on steels by applying a magnetic flux leakage testing method. First of all, a finite element method based on the procedure to analyze the behavior has been implemented of the measurement system under construction. One important question is the position of the sensors or of the detecting coils. The finite element procedure contains a two dimensional arrangement. First, eddy currents have been neglected, but the nonlinear characteristic of the specimen has been taken into account by a single valued function. In this paper, the developed measurement system, which is partially ready to work, and the nonlinear finite element procedures are presented as well. © 2008 Akadémiai Kiadó.

Open Access: Yes

DOI: 10.1556/Pollack.3.2008.1.7