Plenary Lecture

Simulation of Electromagnetic Devices using
Coupled Models

Assoc. Prof. Ion Carstea
University Of Craiova, Romania
incrst@yahoo.com

Abstract: This work presents numerical algorithms for simulation of distributed-parameter systems with direct applications in electrical engineering. The algorithms are developed in the context of the finite element method.
Many works in the professional literature present coupled models for the electromagnetic devices and this work is toward this direction with emphasis on the development of efficient algorithms in numerical computation of the coupled models.
The work is structured in two sections:
• One is dedicated to coupled electrical and thermal fields
• Another section is for numerical simulation of coupled magneto-thermal fields
Many areas of electrical engineering require the solution of problem in which the electromagnetic field equations are coupled to other partial differential equations, such as those describing thermal, fluid flow or stress behaviour. These phenomena are described by equations that are coupled.
The power losses in the electromagnetic devices are transformed in the heat. The heat generated in different parts of the electromagnetic devices is the effect of the electromagnetic field. In our work, we present the coupling between the two fields – electromagnetic and thermal. This is a natural phenomenon and only in a simplified approach the field analysis can be treated as independent problem.
In several cases, it is possible a decoupling and a cascade solution of the coupled equations. One approach is to solve each field equation separately, recouping then the set in some way.
Another attractive and efficient approach of solving coupled differential equations is to consider the set as a single system. In this way a single linear algebraic system for the whole set of differential equations is obtained after discretization, and is solved to a single step. If one or more equations are nonlinear, nonlinear iterations of the whole system are required.

Brief Biography of the Speaker:
The speaker is an Assoc. Professor at the Computer Engineering and Communications Department, Faculty of Automatics, Computers and Electronics, University of Craiova, Romania.
He has a BSc and MSc in Automatics from the University of Craiova, Romania. He has a Ph.D. in Automatics from the University of Ploiesti, Romania. Also, he has a BSc and MSc in Mathematics from the Natural Sciences Faculty, University of Craiova, Romania.
He was director of the research projects supported by international grants at University of Houston (USA)- 6 months (Fulbright Fellowship), at the University of Coimbra, Portugal – 9 months (NATO grant), at the Polytechnics of Milano, Italy- 4 months (a CNR-NATO grant). In 2004 he was invited at the Mathematics Department, University of Trento, Italy, for 2 months.
Ion Carstea has published 10 books in the area of programming languages, advanced computers and CAD of the electromagnetic devices. He is the author of more than 100 papers in revues, scientific journals and international conference proceedings. He is a reviewer for several WSEAS International Conferences and was a member in many international scientific committees. Recently, he is an invited author of a book of the finite element method.
His research interests include parallel algorithms for numerical simulation of the distributed-parameter systems, software products for coupled and inverse problems in engineering, domain decomposition method in the context of the finite element method.