Time-stepping finite element computation for dynamic demagnetization of permanent magnet motorr

Hui Juan Liu, Weinong Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In order to solve the problem that the irreversible demagnetization of permanent magnet (PM) materials may appear during the transient operation of PM motor, a time-stepping finite element method (FEM) for the transient operation simulation of PM motor was proposed through using the PM actual magnetization curves to establish the nonlinear demagnetization model. In the solving process for the magnetic field equation of PM motor, the Jacobian matrix expression applicable to any type and number of elements for the anisotropy material was given. In addition, the Newton-Rafferson formula expressed by space vector matrix and time-stepping finite element formula which could realize the nonlinear iteration computation were derived. The dynamic process of a PM motor when one phase was suddenly short-circuited was simulated with the proposed time-stepping FEM. The computational results correctly show the dynamic demagnetization process of PM materials.
Original languageEnglish
Pages (from-to)257-262
Number of pages6
JournalShenyang Gongye Daxue Xuebao/Journal of Shenyang University of Technology
Issue number3
Publication statusPublished - 1 May 2013


  • Dynamic demagnetization
  • Jacobian matrix
  • Newton-Raphson formula
  • Nonlinear demagnetization model
  • Nonlinear iteration
  • Permanent magnet motor
  • Time-stepping finite element method
  • Transient operation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Industrial and Manufacturing Engineering
  • Mechanical Engineering


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