Comparison study of finite element methods to deal with floating conductors in electric field

Weinong Fu, Siu Lau Ho, Shuangxia Niu, Jianguo Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


In transient magnetic field computation, it is highly desirable if the stray capacitances among all conductors can be computed and their effects addressed conveniently. Because of the existence of floating conductors, the general finite element (FE) solver of Poisson's equation, which is a commonly used magnetic field solver, cannot be used to extract the capacitance matrix directly. In this paper, methods to deal with floating conductors in the electrostatic field for field solution, and capacitance matrix extraction using finite element method (FEM) are compared; their merits and shortcomings are discussed. A method to compute the electric field and extract the capacitance matrix to include the effect of floating conductors inside the solution domain is put forward. The merit of the proposed algorithm is that the general FE solver can be used without the need for any special program modification. A FE formulation to automatically include the capacitances in transient magnetic field is presented. By using the proposed method, users only need to input the information as how the conductors are connected. All the stray capacitances among conductors are automatically included in the solution of transient magnetic field with the proposed algorithm.
Original languageEnglish
Article number6136576
Pages (from-to)351-354
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number2
Publication statusPublished - 1 Feb 2012


  • Capacitance
  • circuit parameter
  • electric field
  • finite-element method
  • floating conductor
  • magnetic field

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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