Asymmetric Bar Winding for High-Speed Traction Electric Machines

Islam, Sariful; Husain, Iqbal; Ahmed, Adeeb; Sathyan, Anand

doi:10.1109/tte.2019.2962329

Cited by 54 publications

(28 citation statements)

References 26 publications

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“…7. This solution is already under investigation [45] and the relevant results in terms of loss reduction seem to be promising. 2) Parallel paths Another way to possibly reduce AC losses in hairpin windings is to consider parallel paths, as shown in Fig.…”

Section: ) Variable Cross Section Conductorsmentioning

confidence: 99%

“…Another method consists in reducing the dimension of each conductor and leave a free space near the slot opening [44]. A recent study has shown that it is possible to reduce the current density near the slot opening with an asymmetric bar layout, without increasing the manufacturing complexity [45].…”

Section: Ac Lossesmentioning

confidence: 99%

“…3D printing). Another way is to maintain the size of the conductors equal for two layers, as described in [45], with no added manufacturing complexity. In the case of parallel paths, it is important to notice that the number of welding spots increase.…”

Section: ) Impact On Manufacturing Processmentioning

confidence: 99%

See 2 more Smart Citations

Challenges and Future opportunities of Hairpin Technologies

Arzillo

Braglia

Nuzzo

et al. 2020

2020 IEEE 29th International Symposium on Industrial Electronics (ISIE)

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Hairpin windings are seeing an ever-increasing application and development in electrical machines designed for high power and torque densities. In fact, due to their inherently high fill factor, they are very attractive in applications, such as transportation, where these characteristics are considered main design objectives. On the other hand, high operating frequencies also contribute to improve power density of electrical machines. However, at high fundamental frequencies, hairpin windings are characterised by increased Joule losses due to skin and proximity effects. Hence, while these technologies are introducing new opportunities, a number of challenges still need to be addressed. These include manufacturing aspects, contacting processes, thermal management, etc. This paper presents an overview of the current state-of-the-art of hairpin technologies and propose possible future opportunities. The authors' perspective is then finally provided, showing how innovative winding patterns can potentially overcome the above mentioned challenges.

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Section: ) Variable Cross Section Conductorsmentioning

confidence: 99%

Section: Ac Lossesmentioning

confidence: 99%

See 1 more Smart Citation

Challenges and Future opportunities of Hairpin Technologies

Arzillo

Braglia

Nuzzo

et al. 2020

2020 IEEE 29th International Symposium on Industrial Electronics (ISIE)

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show abstract

“…Conventional hairpin windings do not perform well at high frequency, as proximity and skin effects contribute to increase the equivalent winding resistance (AC resistance) and thus power losses, preventing their use in such applications. However, innovative hairpin solutions, which minimize power losses at high frequency, have been proposed in [34] and [35], with promising results also for the aerospace sector.…”

Section: B Possible Solutionsmentioning

confidence: 99%

Partial Discharges in Electrical Machines for the More Electrical Aircraft. Part III: Preventing Partial Discharges

et al. 2021

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In this paper, the results obtained from lab tests on twisted pairs subjected to different voltage waveforms and atmospheric conditions are used to propose how to modify the IEC Std. 60034-18-41. The goal is to make the standard suitable for the More Electrical Aircraft (MEA). The results show that it is initially necessary to screen out materials through simple tests. The enhancement factors for temperature can be modified to consider reduced pressures and temperatures using a simple model. The aging enhancement factor can be reduced considering the reduced sensitivity of the partial discharge inception voltage (PDIV) at low pressures on the enamel thickness. Eventually, reference will be made to the drive discussed in Part I of this series to draw conclusions about the likelihood of partial discharge inception in a random wound stator and how to reduce it by modifying either the inverter or the stator insulation. Reference to a random wound motor is made throughout the paper.

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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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Asymmetric Bar Winding for High-Speed Traction Electric Machines

Cited by 54 publications

References 26 publications

Challenges and Future opportunities of Hairpin Technologies

Challenges and Future opportunities of Hairpin Technologies

Partial Discharges in Electrical Machines for the More Electrical Aircraft. Part III: Preventing Partial Discharges

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

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