Open AccessInvestigation of irreversible demagnetisation in switched flux permanent magnet machines under short‐circuit conditions
Author(s) -
Li GuangJin,
Taras Petrica,
Zhu ZiQiang,
Ojeda Javier,
Gabsi Mohamed
Publication year - 2017
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2016.0189
Subject(s) - magnet , matlab , magnetic circuit , short circuit , magnetic flux , fault (geology) , current (fluid) , materials science , finite element method , mechanical engineering , electrical engineering , computer science , engineering , magnetic field , physics , voltage , structural engineering , geology , seismology , operating system , quantum mechanics
The irreversible magnet demagnetisation phenomena are investigated, under both healthy and short‐circuit conditions for a switched flux permanent magnet (SFPM) machine. The temperature effects on permanent magnet material are taken into account and the influence of short‐circuit current over demagnetisation is evaluated. To calculate the short‐circuit current (mainly inter‐turn short circuit), the MATLAB/Simulink model has been employed. The aforementioned short‐circuit current is then fed to the finite‐element model, so the demagnetisation analysis can be carried out. Various fault scenarios are investigated, including a high speed and high fault severity. It is found that the short‐circuit current has limited effect on the magnet demagnetisation due to particular features of the SFPM machines. The mechanism of demagnetisation has been revealed and found out to be mainly due to temperature rise and poor PM materials utilisation. Experiments have been carried out to validate the MATLAB/Simulink model for short‐circuit current predictions.