2015/06/02 by Hyung-Kyu Kim, Dong-Hyeok Kang, Jin Hur · 29 citations
Engineering · Materials Science · Mathematics · #Computer science #Control theory (sociology) #Counter-electromotive force #Demagnetizing field #Direct torque control #Electric Motor Design and Analysis #Electromotive force #Fault (geology) #Flux linkage #Harmonic analysis #Harmonics #Induction motor #Machine Fault Diagnosis Techniques #Magnet #Magnetic Properties and Applications #Magnetic field #Magnetic flux #Magnetization #Mathematical analysis #Mathematics #Mechanics #Nuclear magnetic resonance #Physics #Voltage #Waveform
paper · doi:10.1109/tmag.2015.2439716
published in IEEE Transactions on Magnetics 51(11), 1-4 (IEEE Magnetics Society)
openalex publication_date 2015/06/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
This paper proposes a detection technique for irreversible demagnetization using the harmonics characteristics of the back electromotive force (BEMF) in brushless dc motors (BLDCMs). We analyze the harmonics characteristics of the BEMF that are obtained for fault types encountered by interior permanent magnet (PM)-type BLDCMs according to the magnetization pattern of irreversible demagnetization. An irreversible demagnetized PM is represented as an equivalent magnetizing distribution by applying space harmonics analysis using both the finite element method and the space harmonics method. Furthermore, we analyze flux linkage and BEMF waveforms for different demagnetization ratios.