Numerical Investigation of AC Loss in HTS Bulks Subjected to Rotating Magnetic Fields

et al. 2022

Energies

Self Cite

High-temperature superconducting materials have shown great potential for the design of large-scale industry applications. However, they are complicated under AC conditions, resulting in penalties such as power loss or AC loss. This loss has to be considered in order to design reliable and efficient superconducting devices. Furthermore, when superconductors are used in rotating machines, they may be exposed to rotating magnetic fields, which is critical for the design of such machines. Existing AC loss measuring techniques are limited to measuring under one-dimensional AC magnetic fields or transport currents. Therefore, it is essential to develop and investigate robust experimental techniques to investigate the loss mechanism in HTS machines. In this paper, a new and novel experimental technique has been presented to measure AC loss in rotating magnetic field conditions. The loss under rotating magnetic fields is measured and compared by numerical modeling methods, and the results show a strong correlation with the numerical modeling and show the effectiveness of the experimental setup.

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Setup for Measurement of AC Loss in HTS under Rotating Magnetic Field

et al. 2022

Energies

Self Cite

“…It should be noted that the loss distribution is captured at the same geometrical orientation to understand the pattern of distribution upon magnetizing in different axes. A detailed analysis of AC loss under various amplitudes and orientations of rotating magnetic fields is presented in [23].…”

Section: Ac Loss Distributionmentioning

confidence: 99%

Three-Dimensional Numerical Characterization of High-Temperature Superconductor Bulks Subjected to Rotating Magnetic Fields

et al. 2022

Energies

High-temperature superconductor (HTS) bulks have shown very promising potential for industrial applications due to the ability to trap much higher magnetic fields compared to traditional permanent magnets. In rotating electrical machines, the magnetic field is a combination of alternating and rotating fields. On the contrary, all studies on electromagnetic characterization of HTS presented in the literature so far have only focused on alternating AC magnetic fields and alternating AC loss due to the unavailability of robust experimental techniques and analytical models. This paper presents a numerical investigation on the characterization of HTS bulks subjected to rotating magnetic fields showing AC loss, current density distribution in three-dimensional axes, and trapped field analysis. A three-dimensional numerical model has been developed using H-formulation based on finite element analysis. An HTS cubic sample is magnetized and demagnetized with two-dimensional magnetic flux density vectors rotating in circular orientation around the XOY, XOZ, and YOZ planes.

“…The electromagnetic characteristics of HTS materials in rotating magnetic fields need to be investigated in order to fully comprehend electromagnetic characteristics for the effective design of HTS rotating machines. Recent works by the authors [ 12 , 13 , 14 ] concentrate on numerical analyses of AC loss due to rotating magnetic fields, where it was discovered that such AC loss differs dramatically from one-dimensional magnetization when exposed to rotating magnetic fields. Although these numerical models are effective in determining how the HTS material will behave, experimental methods are equally crucial for examining the HTS electromagnetic characteristics.…”

Section: Introductionmentioning

confidence: 99%

AC Loss in High-Temperature Superconducting Bulks Subjected to Alternating and Rotating Magnetic Fields

et al. 2023

Materials

Self Cite

High-temperature superconductor (HTS) bulks have demonstrated extremely intriguing potential for industrial and commercial applications due to their capability to trap significantly larger magnetic fields than conventional permanent magnets. The magnetic field in electrical rotating machines is a combination of alternating and rotational fields. In contrast, all previous research on the characterization of electromagnetic properties of HTS have solely engrossed on the alternating AC magnetic fields and the associated AC loss. This research paper gives a thorough examination of the AC loss measurement under various conditions. The obtained results are compared to the finite element-based H-formulation. The AC loss is measured at various amplitudes of circular flux density patterns and compared with the AC loss under one-dimensional alternating flux density. The loss variation has also been studied at other frequencies. The findings in this research paper provide more insights into material characterization, which will be useful in the design of future large-scale HTS applications.