General Analytical Modeling for Magnet Demagnetization in Surface Mounted Permanent Magnet Machines

Baocheng Guo, Yunkai Huang, Fei Peng, Jianning Dong

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
102 Downloads (Pure)


This paper proposes an analytical model for the prediction of airgap magnetic field distribution for axial flux permanent magnet (AFPM) machine with partial magnet demagnetization. The AFPM machine geometry is first converted to a polar representation. Consequently, the subdomain model based on current sheet technique is developed. Then current sheet representation of PM is derived to consider the partial demagnetization using superposition principle. The back electromagnetic forces and cogging torque are obtained accordingly based on Maxwell's equations. The results show that the results of proposed approach agrees with that of finite-element method. The model is further validated by experiments under both healthy and demagnetized conditions, which can validate the proposed approach. Main contribution of the work is to consider the partial irreversible demagnetization. Moreover, the proposed method is applicable for both AFPM and radial flux permanent magnet machine.

Original languageEnglish
Article number8482461
Pages (from-to)5830-5838
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number8
Publication statusPublished - 2019


  • Axial flux permanent magnet (AFPM) machine
  • current sheet model
  • demagnetization
  • magnetic field


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