Potential for Torque Density Maximization of HTS Induction/Synchronous Motor by Use of Superconducting Reluctance Torque

Nishimura, Tatsuo; Nakamura, Taketsune; Li, Quan; Amemiya, Naoyuki; Itoh, Yoshitaka

doi:10.1109/tasc.2013.2283238

Cited by 17 publications

(9 citation statements)

References 6 publications

(10 reference statements)

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“…Even though HTS is more expensive than copper, it has already been used as coil material, e.g. for power generators of wind turbines [113], [114] and fault current limiters [115], [116]. But HTS is not as prevalent in WPT.…”

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confidence: 99%

A critical review on wireless charging for electric vehicles

Machura

2019

Renewable and Sustainable Energy Reviews

209

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Electric vehicles (EVs) have recently been significantly developed in terms of both performance and 10 drive range. There already are various models commercially available, and the number of EVs on road 11 increases rapidly. Although most existing EVs are charged by electric cables, companies like Tesla, 12 BMW and Nissan have started to develop wireless charged EVs that don't require bulky cables. 13 Rather than physical cable connection, the wireless (inductive) link effectively avoids sparking over 14 plugging/unplugging. Furthermore, wireless charging opens new possibilities for dynamic chargingcharging while driving. Once realised, EVs will no longer be limited by their electric drive range and the requirement for battery capacity will be greatly reduced. This has been prioritised and promoted worldwide, particularly in UK, Germany and Korea. This paper presents a thorough literature review on the wireless charging technology for EVs. The key technical components of wireless charging are summarised and compared, such as compensation topologies, coil design and communication. To enhance the charging power, an innovative approach towards the use of superconducting material in coil designs is investigated and their potential impact on wireless charging is discussed. In addition, health and safety concerns about wireless charging are addressed, as well as their relevant standards. Economically, the costs of a wide range of wireless charging systems has also been summarised and compared.

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confidence: 99%

A critical review on wireless charging for electric vehicles

Machura

2019

Renewable and Sustainable Energy Reviews

209

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“…Since it is more challenging to remove heat at a lower temperature, the required input power to the cooling system is significantly larger for 20 K as compared to 65 K [23]. In addition, operating at low temperatures such as 20 K or even 10 K requires a large number of cooling heads making these designs impractical [6]. To maintain a higher efficiency and a simplified cooling system, 65 K was chosen as the operating temperature, at the cost of increased superconducting tape requirements.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the air gap diameter of the machine increases with each additional module hence the power density is expected to increase significantly for this stacking method. The basic machine equation shown in (6) highlights that the power output is proportional to the air gap diameter squared.…”

Section: Fig 6 Reluctance Network For Axial Stackingmentioning

confidence: 99%

“…High temperature superconducting (HTS) tapes are used for the field winding, HTS tapes allow for a very high current density, which increases the magnetic loading of the generator and makes it very compact. HTS bulks can also be used to develop superconducting machines, but their size is very limited [6][7][8][9]. HTS tapes can be wound into fielding windings of flexible size for a wide range of required power levels.…”

Section: Introductionmentioning

confidence: 99%

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Modular and stackable power generators for efficient renewable power generation

Kails

Mueller

2019

IET Renewable Power Generation

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Stackable power generators enable very compact electric machines with high power density. How to identify an effective way of stacking is necessary and requires new knowledge for future guidance. In this paper, both possibilities of stacking modules concentrically and axially are explored and compared. An axial flux generator based on our existing double claw pole design is used as a case study. The claw pole generator, which is modular and stackable, significantly benefits on-site installation due to its flexible small modules that can be easily transported. This is particularly important to the installation of offshore wind turbines. Superconducting field windings are applied instead of copper in such power generators, which greatly increases their power density. In order to further increase their power density and reduce mass, we improved the modularity of 5 MW generators and stacked them in both ways. Results show that the power density versus mass as well as volume can be improved through stacking the modules both concentrically and axially, while the former approach is much more effective. Stacking two modules of 5 MW concentrically results in a 12.1 MW power generator with a more compact structure and higher power density than the original 10 MW generator. Poles 88 Stator coils per stator 66 Power output 10 MW Line voltage 3.3 kV Rotational speed 10 rpm Power density 54.28 W/kg Efficiency 94.50 %

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“…YNAMIC loss occurs when a superconductor carrying DC transport current is exposed to an external alternating magnetic field [1][2][3]. This is particularly important to HTS coated conductors, which have emerged as a promising option for the next generation power devices such as rotating machines [5][6][7] as well as associated flux pumps [8][9][10][11], fault current limiters [12][13][14] and power cables [15][16][17][18]. However, dynamic loss is difficult to predicate and estimate, since it only occurs under certain conditions that depend heavily on transport current and external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Dynamic Loss in HTS-Coated Conductors Under Perpendicular Magnetic Fields

Li¹,

Yao²,

Jiang³

et al. 2021

Preprint

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© 2017 IEEE. High-Tc superconducting (HTS)-coated conductors are a promising option for the next-generation power devices. However, their thin-film geometry incurs dynamic loss when exposed to a perpendicular external ac magnetic field, which is difficult to predicate and estimate. In this paper, we propose and verify a numerical simulation model to predict the dynamic loss in HTS-thin-coated conductors by taking into account their Jc-B dependence and I-V characteristics. The model has been tested on a SuperPower YBCO-coated conductor, and we observed a linear increase of dynamic loss along the increasing field amplitude after the threshold field. Our simulation results agree closely with experimental measurements as well as an analytical model. Furthermore, the model can predict the nonlinear increase of dynamic loss at high current, while the analytical model deviates from the measurement results and still shows a linear correlation between the dynamic loss and the external magnetic field. In addition, we have used this model to simulate the distributions of magnetic field and current density when dynamic loss occurs. Results clearly show the flux traversing the coated conductor, which causes dynamic loss. These distributions have also been used to analyze the change of dynamic loss when either the transport current or the magnetic field increase individually, while the other factor remains constant. The simulation analysis on dynamic loss is done for the first time in this paper, and our results clearly demonstrate how dynamic loss changes as well as its dependence on transport current and magnetic field. © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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Potential for Torque Density Maximization of HTS Induction/Synchronous Motor by Use of Superconducting Reluctance Torque

Cited by 17 publications

References 6 publications

A critical review on wireless charging for electric vehicles

A critical review on wireless charging for electric vehicles

Modular and stackable power generators for efficient renewable power generation

Numerical Modeling of Dynamic Loss in HTS-Coated Conductors Under Perpendicular Magnetic Fields

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