Comparison of Losses in Small Star- and Delta-Connected Permanent Magnet Synchronous Machines

Decker, Simon; Rollbühler, Christoph; Brodatzki, Matthias; Rehm, Felix; Liske, Andreas; Hiller, Marc

doi:10.23919/epe21ecceeurope50061.2021.9570519

Cited by 1 publication

(1 citation statement)

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“…The delta connection, characterized by higher line currents yet lower line voltages, is preferred in high-voltage settings [8]. However, it has been experimentally verified that the third back-EMF harmonics lead to zero-sequence currents in the delta connection [9]. It was reported in [10] that the delta connection can result in about 5.8% larger copper loss than the star connection due to the zero-sequence currents.…”

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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Section: Introductionmentioning

confidence: 99%