Electromagnetic Design of 13.2 MW Fully Superconducting Machine

Lin, Feng; Qu, Ronghai; Li, Dawei; Cheng, Yi; Sun, Jianbo

doi:10.1109/tasc.2018.2797944

Cited by 12 publications

(5 citation statements)

References 13 publications

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“…To make this clearer, the definition of the thermal energy, θ[eV] = k T, can be used in Equation (12) for K Saha , which is then used in Equation ( 21) to manifest the dependence of the electron number density (n e ) only on: (1) the absolute temperature (T[K]), (2) the number density of seed atoms before ionization (n ʹ s ), and (3) the ionization energy of the seed gas (ϵ i [eV]). This mathematical processing leads to a modified version of Equation ( 21), which is Equation (39).…”

Section: Indexmentioning

confidence: 99%

“…These endeavors proved that MHD power generation is viable, but also is economically non-competitive and technologically challenging. However, with advancements in related technologies, such as superconducting electromagnets [ [37] , [38] , [39] , [40] , [41] ], and the alignment of MHD power generation with the elevated-temperature oxygen-fired power plants coupled with carbon capture for the CO 2 -enriched combustion products [ [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] ], this concept was revisited recently with a potential for realization or at least conducting revised feasibility studies [ 55 , 56 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Estimated electric conductivities of thermal plasma for air-fuel combustion and oxy-fuel combustion with potassium or cesium seeding

Marzouk

2024

Heliyon

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Section: Indexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimated electric conductivities of thermal plasma for air-fuel combustion and oxy-fuel combustion with potassium or cesium seeding

Marzouk

2024

Heliyon

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“…Concerning AC loss, MgB 2 possesses the advantage of a round wire compared with a flat tape; thus, it has the potential to become a low AC loss superconductor operating below 30 K [28]. Given this fact, many fully superconducting machine designs have adopted MgB 2 coils as armature windings to avoid unbearable AC loss [29][30][31]. To maintain high electrical and magnetic loadings, while decreasing AC loss, multifilamentary HTS CCs have been implemented into electrical machines as an alternative [32].…”

Section: Superconducting Materials Applied To Electrical Machinesmentioning

confidence: 99%

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Zhang¹,

Wen²,

Grilli

et al. 2021

Energies

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Superconductor technology has recently attracted increasing attention in power-generation- and electrical-propulsion-related domains, as it provides a solution to the limited power density seen by the core component, electrical machines. Superconducting machines, characterized by both high power density and high efficiency, can effectively reduce the size and mass compared to conventional machine designs. This opens the way to large-scale purely electrical applications, e.g., all-electrical aircrafts. The alternating current (AC) loss of superconductors caused by time-varying transport currents or magnetic fields (or both) has impaired the efficiency and reliability of superconducting machines, bringing severe challenges to the cryogenic systems, too. Although much research has been conducted in terms of the qualitative and quantitative analysis of AC loss and its reduction methods, AC loss remains a crucial problem for the design of highly efficient superconducting machines, especially for those operating at high speeds for future aviation. Given that a critical review on the research advancement regarding the AC loss of superconductors has not been reported during the last dozen years, especially combined with electrical machines, this paper aims to clarify its research status and provide a useful reference for researchers working on superconducting machines. The adopted superconducting materials, analytical formulae, modelling methods, measurement approaches, as well as reduction techniques for AC loss of low-temperature superconductors (LTSs) and high-temperature superconductors (HTSs) in both low- and high-frequency fields have been systematically analyzed and summarized. Based on the authors’ previous research on the AC loss characteristics of HTS coated conductors (CCs), stacks, and coils at high frequencies, the challenges for the existing AC loss quantification methods have been elucidated, and multiple suggestions with respect to the AC loss reduction in superconducting machines have been put forward. This article systematically reviews the qualitative and quantitative analysis methods of AC loss as well as its reduction techniques in superconductors applied to electrical machines for the first time. It is believed to help deepen the understanding of AC loss and deliver a helpful guideline for the future development of superconducting machines and applied superconductivity.

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“…2 (b). When evaluating fully SC machine losses, the air-gap field is obtained from a detailed transient simulation, then analytical and FEA models are used on loss estimation [7], [27]- [31]. Carr's proposed ac loss models for stationary and uniform rotating fields to estimate losses in SC [12].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous Loss Integration Method to Estimate AC Losses in Superconductors With Spatial and Time Harmonics

Balachandran

Haran

2023

IEEE Trans. Appl. Supercond.

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Estimating AC loss is an essential step in designing fully superconducting (SC) machines, which typically involves using analytical and Finite Element Analysis (FEA) models. Established analytical models are available for stationary sinusoidal and uniform rotating fields. But, the fully SC armature winding experiences a non-uniform rotating magnetic field that can result in varying losses. In this paper, we propose extended analytical methods to estimate AC losses in non-uniform rotating magnetic fields. Our proposed methods can refine the AC loss estimation process and improve the subsequent cryogenic load design. The significant advantage of our proposed method is the ability to capture the impact of AC losses due to varying field magnitude within a single cycle. We estimate losses for various scenarios and compare them to FEA analysis results to verify the accuracy of our model. We then experimentally validate the FEA models used in the analysis for uniformly rotating fields, which establishes the feasibility of our proposed models.

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Electromagnetic Design of 13.2 MW Fully Superconducting Machine

Cited by 12 publications

References 13 publications

Estimated electric conductivities of thermal plasma for air-fuel combustion and oxy-fuel combustion with potassium or cesium seeding

Estimated electric conductivities of thermal plasma for air-fuel combustion and oxy-fuel combustion with potassium or cesium seeding

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

Instantaneous Loss Integration Method to Estimate AC Losses in Superconductors With Spatial and Time Harmonics

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