AUTHOR : Byeong-Hwa Lee, Jae-Woo Jung, Kyu-Seob Kim, Jung-Pyo Hong, Kyu-Sik Kim
ORGANIZATION : Compumag 2013
JOURNAL : Compumag 2013
YEAR : 2013.7
VOL :
ISSUE :
PAGE : ~
This paper presents the effective analysis method of irreversible demagnetization for line-start permanent magnet (LSPM) motor considering magnetic field produced by secondary conductor bars. The magnetic field by the secondary conductor bars opposes the variation of magnetic field by primary part, and this result in the reduced magnetic field acting on permanent magnet. By using Finite
Element Analysis (FEA) in transient magnetic field, currents in primary and secondary conductors are estimated and used for demagnetization analysis in magneto-static field. Therefore, closer condition to actual situation can be achieved. General demagnetization analysis using primary currents only and presented analysis methods are compared and verified by experiments. General demagnetization analysis leads to the over estimation of magnetic field acting on permanent magnet, and results in excessive permanent magnet usage.