Design Study of 10 MW REBCO Fully Superconducting Synchronous Generator for Electric Aircraft

Komiya, Masataka; Aikawa, Takuya; Sasa, Hiromasa; Miura, Shun; Iwakuma, Masataka; Yonetani, Takashi; Sasayama, Teruyoshi; Tomioka, Akihiro; Konno, Masayuki; Izumi, Teruo

doi:10.1109/tasc.2019.2906655

“…( 9) is postponed to the steady-state condition is reached. An existing superconductor model from [22]- [24] is used as a reference geometry for this paper. The width and height are increased to be more manageable and achieve a higher critical current as shown in Fig.…”

Section: Superconducting Coilmentioning

confidence: 99%

Comparison of AC-Superconducting Multi-Phase Symmetric-Winding Topologies for Wind Power Generators with Passive PM Rotors

Tome¹,

Nilssen²,

Nøland³

2021

Preprint

0

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In this paper, an AC superconducting multi-phase symmetric-winding machine is designed for a wind power generator to improve its performance and reduce losses, where four handpicked topological designs were explored and compared. In particular, it is found that using high-phase order of unique phasors further improves the performance. The iron losses are reduced, and the rippling behaviour is reduced due to the smoother airgap magnetic flux density. Furthermore, a higher LCM is achieved due to a better slot-pole combination for fractional slot concentrated windings without having space sub-harmonics. Nonetheless, it is shown that creating a smooth air gap magnetic flux density does not improve the AC hysteretic superconducting losses; thus, further analysis with another approach must be done. Moreover, it is found that the Meisner effect is present in the machine and is inversely proportional to the AC hysteretic superconducting losses. Finally, it shows that a 13-phase AC-superconducting machine can achieve a theoretical limit approaching 101.7017 Nm/kg for the torque-to-weight (TTW) ratio, outperforming a classic winding layouts.

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“…Here, the COP is set to 0.06 at 65 K according to [23]. 1 The weight density of the REBCO superconducting tape is 8.19 g/cm 3 according to [22]. 2 The neodymium magnet density is set to 7.4 g/cm 3 .…”

Section: E Efficiency and Torque Densitymentioning

confidence: 99%

Comparison of AC-Superconducting Multi-Phase Symmetric-Winding Topologies for Wind Power Generators with Passive PM Rotors

Tome¹,

Nilssen²,

Nøland³

2021

Preprint

0

View full text Add to dashboard Cite

In this paper, an AC superconducting multi-phase symmetric-winding machine is designed for a wind power generator to improve its performance and reduce losses, where four handpicked topological designs were explored and compared. In particular, it is found that using high-phase order of unique phasors further improves the performance. The iron losses are reduced, and the rippling behaviour is reduced due to the smoother airgap magnetic flux density. Furthermore, a higher LCM is achieved due to a better slot-pole combination for fractional slot concentrated windings without having space sub-harmonics. Nonetheless, it is shown that creating a smooth air gap magnetic flux density does not improve the AC hysteretic superconducting losses; thus, further analysis with another approach must be done. Moreover, it is found that the Meisner effect is present in the machine and is inversely proportional to the AC hysteretic superconducting losses. Finally, it shows that a 13-phase AC-superconducting machine can achieve a theoretical limit approaching 101.7017 Nm/kg for the torque-to-weight (TTW) ratio, outperforming a classic winding layouts.

show abstract

“…system is one of the promising solutions [4][5] and many research groups are investigating the electric aircraft with superconducting rotating machines [6][7][8][9][10]. However, the conventional rotating machines composed of iron cores and copper windings are too heavy to satisfy the stringent weight requirement of aircraft applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of 1 kW-class Prototype REBCO Fully Superconducting Synchronous Motor Cooled by Subcooled Liquid Nitrogen for E-Aircraft

Sasa

¹

,

Iwakuma

²

,

Yoshida

³

et al. 2021

IEEE Trans. Appl. Supercond.

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For the development of electric propulsion aircrafts with light weight, low emission and high efficiency, MW-class fully superconducting synchronous machines operating at liquid nitrogen temperature were conceptually designed with REBa2Cu3O7-δ (REBCO) superconducting tapes in our previous studies. To verify the actualization of the structure and cooling method, a 1 kW-class prototype fully superconducting synchronous motor was designed and constructed in this study. The fixed armature was cooled with subcooled liquid nitrogen at 65 K. The rotor was cooled with helium gas. The pole number was two for the future high speed operation. The applicability of the complicated casing structure with three chambers into fully superconducting motor was also investigated from the viewpoint of thermal insulation. The operations as a motor up to 500 rpm and a generator demonstrated that the designed structure and cooling method were reasonable and effective for cooling the fixed armature and rotating field windings.

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Design Study of 10 MW REBCO Fully Superconducting Synchronous Generator for Electric Aircraft

Cited by 41 publications

References 11 publications

Comparison of AC-Superconducting Multi-Phase Symmetric-Winding Topologies for Wind Power Generators with Passive PM Rotors

Comparison of AC-Superconducting Multi-Phase Symmetric-Winding Topologies for Wind Power Generators with Passive PM Rotors

Comparison of AC-Superconducting Multi-Phase Symmetric-Winding Topologies for Wind Power Generators with Passive PM Rotors

Experimental Evaluation of 1 kW-class Prototype REBCO Fully Superconducting Synchronous Motor Cooled by Subcooled Liquid Nitrogen for E-Aircraft

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