EVALUATION OF THE METHODS OF FINITE-ELEMENTS AND FINITE-DIFFERENCES IN THE SOLUTION OF NON-LINEAR ELECTROMAGNETIC-FIELDS IN ELECTRICAL MACHINES

被引:19
作者
DEMERDASH, NA
NEHL, TW
机构
[1] Department of Electrical Engineering, Virginia Polytechnic Institute and State University, Blacksburg
来源
IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS | 1979年 / 98卷 / 01期
关键词
D O I
10.1109/TPAS.1979.319516
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, an evaluation of the methods of finite elements and finite differences, as applied to nonlinear magnetic field problems in electrical machines, is presented. The evaluation covers the aspects of effectiveness, numerical accuracy, modeling implementation considerations as well as computer storage and execution time requirements of the two methods. The evaluation includes static as well as sinusoidally time varying fields. The method of finite elements is found to be superior in improved accuracy, computer time and storage requirements, as well as programming implementation aspects. A crucial finding of this investigation is that results derived from the finite element analysis tend to converge asymptotically to corresponding experimental test data, as the discretization mesh fineness is increased. This is not the case for finite differences, where the results strongly indicate that there are lower bounds beyond which inherent numerical error cannot be decreased by an increase in the degree of fineness of the corresponding discretization mesh. Details of the analysis, on which these findings stand, are presented here. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.
引用
收藏
页码:74 / 87
页数:14
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