Loss calculation of bar-wound high-power-density PMSMs with massively parallel processing

Sano, Hiroyuki; Aasanuma, Tatsuya; Katagiri, Hirokatsu; Miwa, Masanori; Semba, Kazuki; Yamada, Takashi

doi:10.1109/iemdc.2017.8002252

Cited by 14 publications

(2 citation statements)

References 11 publications

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“…In [19] and [20], the end winding leakage inductances are investigated, while in [4] and [21] their cooling is analyzed through oil spray. To the authors' knowledge, only in [22] and [23] the total machine Joule losses are analyzed and the end windings AC losses are considered separately. The results indicate that for a few hundreds of Hertz the end winding losses are nearly DC only, while the frequency dependent effects can become much more relevant around the 1 kHz range.…”

Section: A Motivation and Aimmentioning

confidence: 99%

On the AC Losses in the End Conductors of Hairpin Windings

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et al. 2022

2022 International Conference on Electrical Machines (ICEM)

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In the last years, several resources have been employed to increase torque and power density values in electrical machines, especially in those intended for transport applications. In this context, the adoption of hairpin conductors is spreading thanks to their inherently high fill factor. Their main drawback is represented by their sensitivity to highfrequency phenomena, which can have a significant impact on the Joule losses and thus on the overall efficiency.While several researches have recently focused on ways to model and reduce such high-frequency losses in the slots, i.e. within the conductors' active sides, a few data are available on their impact in the end winding regions.This work provides an investigation on the AC losses occurring in the end conductors of a hairpin winding traction motor. The losses are determined through 3D finite element simulations for a wide frequency range, and compared against those occurring in the active part of the machine.

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Section: A Motivation and Aimmentioning

confidence: 99%

On the AC Losses in the End Conductors of Hairpin Windings

Pastura

Notari

Nuzzo

et al. 2022

2022 International Conference on Electrical Machines (ICEM)

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“…The hairpin winding can effectively improve the slot fill factor [5], [6]. But the hairpin winding has a large eddy current loss due to its large cross-sectional area [7][8][9][10]. The eddy current loss in the hairpin winding needs to be solved urgently.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Circulating Current Loss in the Formed Winding of Permanent Magnet Synchronous Motors

et al. 2021

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Permanent magnet synchronous motors with the formed winding can not only improve the slot fill factor and heat dissipation capacity but also effectively reduce the additional loss in the winding. Formed winding permanent magnet synchronous motors will become the future development tendency. Due to inherent features of the formed winding, the circulating current loss is a non-negligible issue. This paper proposes using the formed winding in permanent magnet synchronous motors and analyzes the circulating current loss in the formed winding. First, the finite element models of integer slot and fractional slot motors are established, and the magnetic field analysis are carried out. Then two commonly used methods of calculating circulating current loss are introduced in detail, and their calculation results are compared. Moreover, the high-precision field-circuit coupled finite element method is used to calculate the circulating current loss of integer and fractional motors. And circulating currents of the hairpin winding and the formed winding are compared. The analysis indicates that the circulating current in the formed winding cannot be ignored. Finally, comprehensive and in-depth research on the influencing factors of circulating current loss in the formed winding has been conducted. The results clarify that the number of parallel strands, the width of the slot opening, and the stator current have a considerable influence on the circulating current loss. INDEX TERMSCirculating current loss, field-circuit coupling, permanent magnet synchronous motors, slot-pole combination, the formed winding.

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