Experimental investigation of the relationship between magnetic properties of permanent magnet against temperature and pressure coupling environment

Xiao, Lijun; Yu, Guodong; Zou, Jibin; Xu, Yongxiang; Zheng, Boyuan; Liu, Chengsi

doi:10.1109/icems.2019.8922146

Cited by 1 publication

(1 citation statement)

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“…Demagnetization can reduce the average torque and exacerbate torque ripple [20][21][22], which has great influence on machine reliabilities. It usually results from short-circuit faults under high PM temperature [21,23,24]. Short circuits are one of the most critical faults in SPM machines.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Short Circuits and Demagnetization in Delta, Star, and Hybrid Winding Connections for Surface-Mounted Permanent Magnet Machines

Chen,

Du,

Zhan

et al. 2024

Machines

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This article comprehensively compares the short circuits and irreversible demagnetization in star, delta, and hybrid winding connections for surface-mounted permanent magnet (SPM) machines, including the three-phase short circuit (3PSC) and two-phase short circuit (2PSC). The analytical and finite element (FE) methods are adopted. It is found that when 3PSC or 2PSC happens, the peak current is the largest in the hybrid connection, which further results in the severest demagnetization. In addition, the delta connection always results in a larger 2PSC peak current than the star connection. Under relatively low permanent magnet (PM) temperature, the delta connection leads to more severe demagnetization than the star connection. However, when PM temperature increases, the opposite condition can occur. As for 3PSC, whether the peak current of the delta connection exceeds that of the star connection is determined by the phase of the third back-EMF harmonic. The delta connection shows higher 3PSC peak current when the third harmonic is in phase with the fundamental back EMF, and conversely, the star connection shows higher peak current. The comparison of demagnetization also heavily depends on PM temperature. Finally, the experiments are conducted to verify the theoretical analysis.

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