AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core

Wu, Yue; Fang, Jin; Amemiya, Naoyuki; Badcock, Rodney A.; Long, N.J.; Jiang, Zhenan

doi:10.1109/tasc.2023.3246944

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…of different DPCs used in this work, along with the distances (d) [34]. Each DPC has the same turn number to ensure they generate a consistent magnetic field at the same current.…”

Section: Table 4 Lists the Inner Diameter (D 1 ) And Outer Diameter (...mentioning

confidence: 99%

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AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core Using Flux Diverters

Fang

Amemiya

et al. 2023

IEEE Access

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Iron cores are widely employed in high temperature superconducting (HTS) power devices to enhance the magnetic field and improve the power density. In spite of these benefits, the presence of iron cores leads to a substantial increase in AC loss within HTS coil windings. Therefore, it is necessary to estimate the AC loss of HTS coil windings coupled with iron cores to propose methods for loss reduction. An effective way to reduce AC loss is to apply flux diverters (FDs) near the HTS coil windings. In this work, the 3D T -A homogenization method is used to calculate AC losses of the 1DPC (double pancake coil)-, 2DPC-, 4DPC-, and 8DPC assemblies at different currents with four ferromagnetic combinations: with an iron core (IC), with an iron core and FDs (IC_FDs), with an air core (AirC), and with air core and FDs (AirC_FDs). To weaken the impact of the iron core, the enlarged distance between the iron core and coil assemblies is considered to investigate AC loss dependence on this distance. In addition, the influence of the positions of FDs on AC loss reduction is also analyzed. The simulation results demonstrate that FDs can reduce the AC loss in coil assemblies, even when the iron core is present, owing to the reduction of the perpendicular magnetic field component in the end discs. For the 4DPC and 8DPC assemblies with IC, increasing the distance while using FDs, or decreasing the vertical gap between the coil assemblies and FDs, are effective in reducing AC loss.INDEX TERMS AC loss, superconducting coils, iron core, flux diverters, finite element method (FEM), 3D T-A homogenization method.YUE WU received the B.Eng. degree in electrical engineering and automation from the

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“…of different DPCs used in this work, along with the distances (d) [34]. Each DPC has the same turn number to ensure they generate a consistent magnetic field at the same current.…”

Section: Table 4 Lists the Inner Diameter (D 1 ) And Outer Diameter (...mentioning

confidence: 99%

“…In addition, the most straightforward way to obtain AC loss reduction in HTS coil windings coupled with an iron core is to weaken the influence of the iron core [34]. As presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core Using Flux Diverters

Fang

Amemiya

et al. 2023

IEEE Access

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Electromagnetic design for high power density of fully superconducting synchronous motor with through-shaft type field coil for electric aircraft

Uriu,

Iwakuma,

Miyazaki

et al. 2024

J. Phys.: Conf. Ser.

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The global demand for aircraft is currently increasing, paralleled by a growing emphasis on decarbonization through the replacement of fossil fuel engines with electric propulsion. In response to this trend, we have developed a superconducting motor distinguished by its high efficiency, output, and low weight. Our focus centers on two critical aspects. Firstly, we addressed the issue of the field coil’s shape. The widely used REBCO wire in high-temperature superconductivity is tape-shaped, making a racetrack coil the most straightforward method for winding the wire. However, this configuration necessitates dividing the motor shaft as it comes in contact with the field coil, raising concerns about the mechanical durability of motors. To overcome this challenge, we introduce a saddle-type coil and design a coil shape that achieves a single continuous through-axis. Utilizing the Frenet-Serre formula, we created a 3D model of the coil’s end without applying load to the wire. This method, previously employed in accelerators, enhances durability, potentially leading to increased output due to higher rotation speeds and reduces weight through part savings. Secondly, introducing a saddle coil presents challenges in forming an ideal magnetic field distribution. In a rotating-field-type motor using an iron core, the winding can be directly wound around it, resulting in multiple coils forming similar magnetic fields that can be superimposed to create one large magnetic pole. However, with a saddle coil, coils are arranged along the circumference, and the magnetic field distribution and an anticipated decrease in output. To address this, we aimed to optimize the magnetic field distribution and increase output through a parameter survey. Specifically, we conducted an analysis under fixed armature conditions (current, number of turns, and shape) in three cases. In Case1, with a fixed total number of turns for the field coil, we compared magnetic field distributions and output by varying the number and arrangement of coils. In Case2, building on the findings of Case1, we aimed to enhance output by fixing the coil arrangement and increasing the number of turns. Finally, in Case 3, we examined the change in motor size with fixed coil parameters while altering the coil arrangement and pitch.

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AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core

Cited by 2 publications

References 22 publications

AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core Using Flux Diverters

AC Loss Reduction in HTS Coil Windings Coupled With an Iron Core Using Flux Diverters

Electromagnetic design for high power density of fully superconducting synchronous motor with through-shaft type field coil for electric aircraft

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