Analytical Model for the Magnetic Field Distribution in a Flux Modulation Superconducting Machine

Colle, Alexandre; Lubin, Thierry; Ayat, Sabrina; Gosselin, Olivier; Lévêque, Jean

doi:10.1109/tmag.2019.2935696

Cited by 17 publications

(13 citation statements)

References 26 publications

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“…Start with a given cooling temperature, the geometric variables, seen in Table 1, are randomly generated by the GA. The dimensions of the coil and the cooling temperature will size the Jc and thus the torque, the joule and iron losses as well as the mechanical stresses on the coil are obtained by a semi-analytical model [17]. The rest of the parameters are used for the thermal and mass calculation of the machine.…”

Section: Optimization Of the Superconducting Systemmentioning

confidence: 99%

Design of a superconducting machine and its cooling system for an aeronautics application

Colle

Lubin

Lévêque

2021

Eur. Phys. J. Appl. Phys.

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The transition to electric propulsion aircraft requires electrical motors or generators with high power density. The “zero resistivity” of the superconducting materials could be used in electrical machines to produce high magnetic fields and reduce the use of heavy components such as the ferromagnetic parts. The discovery and recent developments in High Temperature Superconductors (HTS) technology make the superconducting machine a serious candidate in the future of aircraft. The design of a superconducting machine is strongly dependent on its electromagnetic and thermal behavior. In this paper, the design of a 50 kW superconducting aircraft generator is presented. The mass of the cryogenic cooling system is included into the design in order to optimize the entire superconducting system. The study shows that the optimal temperature which conduct to the lighter superconducting system depends on the power of the superconducting machine.

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Section: Optimization Of the Superconducting Systemmentioning

confidence: 99%

Design of a superconducting machine and its cooling system for an aeronautics application

Colle

Lubin

Lévêque

2021

Eur. Phys. J. Appl. Phys.

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“…Indeed, producing higher magnetic fields means a bigger and so heavier superconducting coil as it is presented in Figure 7. It represents the magnetic field produced by an HTS REBaCuO coil in a flux modulation machine function of the HTS tapes mass required in a coil of 352 mm in diameter and 107 mm in length designed using a 2D asymmetric model presented in [22]. Note that generating a large magnetic field requires a heavier coil, as the critical current density of the HTS tapes decreases with the magnetic field.…”

Section: Critical Current Density and Magnetic Shielding Propertiesmentioning

confidence: 99%

“…Several topologies of HTS synchronous machines are considered promising such as rotor-wound machines [15,16]; superconducting "permanent magnet" machines, made from HTS bulks [17] or HTS stacks of tapes [18]; and flux modulation machines [19][20][21][22][23]. The last topology, as illustrated in Figure 1 in its axial flux version, is composed by a static solenoid coil made of superconducting tapes which produce a DC magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Review on the Use of Superconducting Bulks for Magnetic Screening in Electrical Machines for Aircraft Applications

et al. 2021

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High-Temperature Superconductors (HTS) considerably accelerate the development of superconducting machines for electrical engineering applications such as fully electrical aircraft. This present contribution is an overview of different superconducting materials that can be used as magnetic screens for the inductor of high specific power electrical machines. The impact of the material properties, such as the critical temperature (Tc) and the critical current density (Jc), on the machine performances is evaluated. In addition, the relevance to flux modulation machines of different HTS bulk synthesis methods are addressed.

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“…Izumi et al have developed an axial-gap-type synchronous machine utilizing GdBCO bulks as field poles, which is meant for low-speed ship propulsion [49]. Bulk superconductors can also serve as lightweight and compact magnetic shields in electrical machines, as reported by Leveque et al [50]. However, a pivotal disadvantage of bulk superconductors lies in their thermal instability at low temperatures, making it hard to exploit the high critical current under 30 K [51].…”

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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Analytical Model for the Magnetic Field Distribution in a Flux Modulation Superconducting Machine

Cited by 17 publications

References 26 publications

Design of a superconducting machine and its cooling system for an aeronautics application

Design of a superconducting machine and its cooling system for an aeronautics application

Review on the Use of Superconducting Bulks for Magnetic Screening in Electrical Machines for Aircraft Applications

Alternating Current Loss of Superconductors Applied to Superconducting Electrical Machines

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