Nonlinear convergence acceleration of magnetic field computation

Shuangxia Niu, Siu Lau Ho, Weinong Fu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)


Finite element method (FEM) has been widely used to analyze the performance of electric devices. Due to the nonlinear permeability of iron materials, Newton-Raphson (N-R) method is usually used in FEM for nonlinear iteration. To accelerate the nonlinear convergence, one effective technique to accelerate the nonlinear convergence is proposed. The basic idea is to use different relaxation factors in different material regions in electric devices. The difference between this proposed method and conventional method is that in conventional method only one relaxation factor is used for all material regions. With the proposed method the total computing time of iteration process of FEM can be reduced effectively. The proposed algorithm is tested on a magnetic field problem of a highly saturated transformer to showcase its effectiveness.
Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
ISBN (Electronic)9781479973224
Publication statusPublished - 1 Jan 2015
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: 11 May 201515 May 2015


Conference2015 IEEE International Magnetics Conference, INTERMAG 2015


  • Electric device
  • finite element method
  • magnetic field
  • nonlinear
  • relaxation factor
  • transformer

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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