An effective method to reduce the computing time of nonlinear time-stepping finite-element magnetic field computation

Weinong Fu, Siu Lau Ho, H. L. Li, H. C. Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

25 Citations (Scopus)


Time-stepping finite-element methods have been widely used to compute the magnetic field of electrical machines. Because the reluctivities of magnetic materials are nonlinear, the finite-element equations have to be solved iteratively. In this paper, an effective method for reducing the computing time of the Newton-Raphson method coupled with the incomplete Cholesky-conjugate gradient algorithm for solving time-stepping finite-element problems is presented. The proposed method is based on a proper prediction of some predefined error tolerances in the iteration processes at each time-stepping finite-element computation. The computational analysis on an induction motor shows that the proposed strategy can reduce the nominal computing time by as much as 50%.
Original languageEnglish
Pages (from-to)441-444
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number2 I
Publication statusPublished - 1 Mar 2002


  • Computation time
  • Finite element
  • ICCG method
  • Newton-Raphson method
  • Nonlinear
  • Time stepping

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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