Numerical Investigation of High-Temperature Superconducting-Coated-Conductors Subjected to Rotating Magnetic Fields

Abstract

Over time, high-temperature superconductor (HTS)-coated conductors (CCs) have proven to be promising candidates for future high-efficiency and high-power density electrical machines. However, their commercialization is handicapped due to the AC dissipative loss that occurs upon exposure to external magnetic fields. In rotating electromagnetic devices, the external magnetic field is a combination of alternating and rotating magnetic fields. Most of the research is devoted to the effect of exposure of the superconductors to alternating magnetic fields only. This article presents an investigation to observe the behavior of HTSCCs under rotating magnetic fields, particularly the AC loss, using a finite-element-based homogeneous H-formulation technique. Our investigation shows that the AC loss could be considerably high when HTSCCs are exposed to rotating magnetic fields and, ultimately, could affect the cooling efficiency of future high-efficiency and high-power density electrical machines.

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

“…Additional results and the Furthermore, the loss variation is also shown in Figure 5, where the HTS sample is subjected to various rotating flux densities up to 90 mT. The loss is also compared with the numerical modeling methods described in [20][21][22]33,34]. H-formulation is a powerful tool based on the finite element modeling method.…”

“…There are some recent studies that focus on the numerical investigations of AC loss under rotating magnetic fields [20][21][22], where it is understood that the AC loss changes significantly under the exposure of rotating magnetic fields compared to one-dimensional magnetization. These numerical models are powerful tools to predict the performance of HTS material, but experimental techniques are also really important for the investigation of HTS' electromagnetic properties.…”

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

“…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.…”