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Simulated Experiments for Teaching CAD Techniques Using Analytic and Finite Element Solutions of Electromagnetic Two-Dimensional Problems with Longitudinal Symmetry

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Journal of Electromagnetic Analysis and Applications 2019年第6期11卷 79-99页

作者： Antonio Flavio Licariao Nogueira Rodolfo Lauro Weinert leonardo jose amador salas maldonado Santa Catarina State University JoinvilleBrazil

The paper describes an approach to teaching low-frequency electromagnetic CAD techniques to undergraduate students pursuing a degree course in electrical engineering. The simulated experiments make use of a two-dimensional open-access software based on the finite-element method. At the laboratory meetings, the problems are initially solved analytically. Upon this, students learn how to create the numeric model and how to define the sequence of field problems that lead to the required solution. Simulation tasks based on a force-producing electromagnet are used to introduce numeric techniques to determine magnetic field distribution, evaluation of energy storage and generation of magnetic forces. The nature of the magnetic force generated in the air gaps of the C-core electromagnet is explained in detail. Magnetic forces are calculated by the classical and weighted versions of the method of Maxwell stress tensor. The paper provides all the basic elements required for further exploration of devices with longitudinal symmetry.

关键词： Actuators Electromagnetic Engineering Education Energy Storage Finite Element Method Magnetic Forces

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An Introductory Note on Finite Element Problems Based on the Eddy Current Testing Approach

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Journal of Electromagnetic Analysis and Applications 2021年第11期13卷 145-159页

作者： Antônio Flavio Licarião Nogueira Rodolfo Lauro Weinert leonardo José amador salas maldonado Department of Electric Engineering Santa Catarina State University Joinville Brazil

The paper addresses the first eddy current benchmark problem proposed by the World Federation of Nondestructive Evaluation Centers (WFNDEC). The problem simulates the eddy current response to the presence of an axisymmetric circumferential defect in an Inconel-600 tube. All simulations employ the axisymmetric code of the electromagnetic field simulator Finite Element Method Magnetics. For three different frequencies of excitation, it is explained how the displacement of the detecting coil inside the tube leads to a variation in the impedance of the eddy current coil. Variations of the resistive and inductive components of the impedance with distance from the defect region are used to build the impedance trajectory for each frequency of analysis.

关键词： Eddy Current Testing Finite Element Analysis Nondestructive Inspection Methods

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Finite Element CAD Experiments on the Effect of Magnetic Loss in Power Transformers with Laminated Cores

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Journal of Electromagnetic Analysis and Applications 2021年第1期13卷 1-19页

作者： Antônio Flavio Licarião Nogueira Rodolfo Lauro Weinert leonardo José amador salas maldonado Department of Electric Engineering Santa Catarina State University Joinville Santa Catarina Brazil

The paper describes a simulated experiment that focuses on the numeric computation of magnetic loss in the laminated core of a single-phase power transformer. The students’ laboratory work is part of the library of experiments of the Electrical Machines virtual laboratory and makes use of the two-dimensional open-access electromagnetic field analysis software Finite Element Method Magnetics. The idea of the simulated exercise is to demonstrate how the magnetic loss caused by time-varying excitations affects the magnetic permeability, μ, of the laminated core and the terminal quantities of the energizing winding. A parametric analysis employing different values for the electrical conductivity and maximum hysteresis-induced angle of the laminated material yields five different field problems with increasing magnetic loss. Electric circuits characterized by the (I-V) operating point and reflected impedance of the energizing winding provide the information required to compute the changes in real power ΔP, reactive power ΔQ and magnetically stored energy ΔWm between successive problems characterized by increasing magnetic loss. The concept of reflected impedance helps to explain the physical meaning of the changes in power dissipation and energy storage in the laminated core.

关键词： Eddy Currents Electromagnetic Engineering Education Finite Element Analysis Hysteresis Magnetic Loss Transformer Cores

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Finite Element CAD Experiments on the Effect of Magnetic Loss in Power Transformers with Laminated Cores

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Journal of Electromagnetic Analysis and Applications（电磁分析与应用期刊） 2021年第1期

作者： Antônio Flavio Licarião Nogueira Rodolfo Lauro Weinert leonardo José amador salas maldonado

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An Introductory Note on Finite Element Problems Based on the Eddy Current Testing Approach

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Journal of Electromagnetic Analysis and Applications（电磁分析与应用期刊） 2021年第11期

作者： Antônio Flavio Licarião Nogueira Rodolfo Lauro Weinert leonardo José amador salas maldonado

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Simulated Experiments for Teaching CAD Techniques Using Analytic and Finite Element Solutions of Electromagnetic Two-Dimensional Problems with Longitudinal Symmetry

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Journal of Electromagnetic Analysis and Applications（电磁分析与应用期刊） 2019年第6期

作者： Antônio Flavio Licarião Nogueira Rodolfo Lauro Weinert leonardo José amador salas maldonado

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