AC Loss Estimation of HTS Armature Windings for Electric Machines

Zhang, Min; Chudý, Michal; Wang, Wei; Chen, Yiran; Huang, Zhen; Zhong, Zhaoyang; Yuan, Weijia; Kvitkovič, J.; Pamidi, Sastry; Coombs, Tim

doi:10.1109/tasc.2013.2239341

Cited by 27 publications

(33 citation statements)

References 14 publications

(16 reference statements)

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“…F. Grilli et al [11], Z. Hong et al [12], E. Pardo et al [13], Souc et al [14] and M. Zhang et al [15] have promoted the numerical scheme for AC loss calculation to more efficient levels. M. Zhang et al has used an experimentally verified H-Formulation to study air cored and distributed windings in motors [16]. However, the transport AC loss of multi-filament YBCO coils have not been discussed clearly in both experiment and simulation parts.…”

Section: Introductionmentioning

confidence: 99%

AC Loss Comparison Between Multifilament and Nonstriated YBCO Coils Designed for HTS Propulsion Motors

Xing

Patel

Sun

et al. 2017

IEEE Trans. Appl. Supercond.

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In this paper, the properties of current capacity and AC transport loss of striated HTS coil is compared with ordinary HTS coil by using both experimental and simulation methods. The measurements were carried out by transporting a sinusoidal varying current at 77K, with an amplitude range of 10-50A in frequency from 70Hz up to 300Hz. Measurement facilities and methods are explained in more detail in the paper. The critical current of the 4mm width multi-filament coil made with 4 filaments at a spacing 0.03mm was found to be lower than that of the non-striated coil. The frequency dependent characteristics agreed well in both experimental and simulated results. Reducing AC loss of HTS is one enabling factor for widespread adoption of the technology and therefore understanding its characteristics is important and discussed in this paper. Future plans based on this preliminary work is the testing of multi-filament tapes in an axial flux motor field environment. 

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Section: Introductionmentioning

confidence: 99%

AC Loss Comparison Between Multifilament and Nonstriated YBCO Coils Designed for HTS Propulsion Motors

Xing

Patel

Sun

et al. 2017

IEEE Trans. Appl. Supercond.

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“…To validate the performance of the HTS coil with the heatshrink tube insulation, we compare the transport loss of it with the transport loss of a HTS racetrack coil with Kapton insulation [12]. The two coils have the same geometry.…”

Section: Discussionmentioning

confidence: 99%

AC Loss Measurements for 2G HTS Racetrack Coils With Heat-Shrink Tube Insulation

Zhang

Wang

Huang

et al. 2014

IEEE Trans. Appl. Supercond.

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A heat-shrink tube insulation for second-generation high-temperature superconducting (2G HTS) coils is studied experimentally in this paper. The insulation can be used to prevent the delamination of 2G HTS due to epoxy impregnation. According to the experiment results, the insulated coil shows no degradation before and after the epoxy impregnation. To validate the performance of 2G HTS coils with the heat-shrink insulation, we measured the transport loss, magnetization loss and total loss of a 2G HTS coil. The study demonstrates the feasibility of the heat-shrink tube insulation method for electrical applications.

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“…In order to simplify the geometry, the racetrack pancake coil is modelled in 2D infinitely long model [12], [19] and the end effect of the two half circles are neglected as illustrated in Fig. 1.…”

Section: D Modelsmentioning

confidence: 99%

Comparison of 2D simulation models to estimate the critical current of a coated superconducting coil

Liu

Grilli

et al. 2018

Supercond. Sci. Technol.

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Superconductors have been being applied to a variety of large-scale power applications, including magnets, electric machines, and fault current limiters, because they can enable a compact, lightweight and high efficiency design. In applications such those mentioned above, superconducting coils are always a key component. For example, in a superconducting electric machine, the superconducting coils are used to generate the main flux density in the air gap, which is significantly important for the energy conversion. It is the performance of the superconducting coils that plays an essential role in determining the performance of the device. However, the performance of a superconducting coil is limited by its critical current, which is determined by temperature and the magnitude and orientation of the magnetic field inside the superconductors. Hence, in-depth investigations to estimate the critical current of the superconducting coils are necessary before manufacturing. Available transient simulation models to estimate the critical current are through the H-and T-A formulations of Maxwell's equations. Both methods consider the same current ramp-up process occurring in experiments. Besides these transient models, static simulations can also be used: a modified load-line method and the so-called P-model, which is based on the asymptotic limit of Faraday's equation when time approaches infinity. To find the best way to calculate the critical current, the four methods are used to estimate the critical current of a double pancake superconducting coils and results are compared with experiments. As a conclusion, T-A formulation, P-model, and the modified load-line methods are recommended for estimating the critical current of the superconducting coils.

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AC Loss Estimation of HTS Armature Windings for Electric Machines

Cited by 27 publications

References 14 publications

AC Loss Comparison Between Multifilament and Nonstriated YBCO Coils Designed for HTS Propulsion Motors

AC Loss Comparison Between Multifilament and Nonstriated YBCO Coils Designed for HTS Propulsion Motors

AC Loss Measurements for 2G HTS Racetrack Coils With Heat-Shrink Tube Insulation

Comparison of 2D simulation models to estimate the critical current of a coated superconducting coil

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