Presentation Information
[WBP2-19]Simulation of magnetization loss in no-insulation coils under high AC magnetic fields at various operating temperatures
*Qingjiao Liu1,2, Ben George Koshy1, Yueming Sun1, Junci Cao2, Zhenan Jiang1 (1. Robinson Research Institute, Victoria University of Wellington (New Zealand), 2. School of Electrical Engineering, Beijing Jiaotong University (China))
Keywords:
Magnetization loss,No-insulation coils,Anisotropic resistivity models,H-formulation
Purpose: This study aims to investigate the magnetization loss characteristics of no-insulation (NI) coils under high external AC magnetic fields(up to 1 T) and low temperature conditions(down to 40 K), addressing the gap in existing studies have focused on the magnetization loss of NI coils under low external AC magnetic fields (up to 100 mT) and at the liquid nitrogen temperature (77 K).
Method: In this work, the magnetization loss of NI coils is numerically investigated using 2D and 3D anisotropic resistivity models based on the H-formulation in COMSOL Multiphysics. The investigation considers a wide range of operating conditions, including external AC magnetic fields up to 1 T, temperatures down to 40 K, frequencies from 0.07 to 200 Hz, different coil turn numbers, and various magnetic field angles.
Results: The simulations show that, under high AC magnetic fields, the magnetization loss increases as temperature decreases. Regarding coil turn numbers, at low AC magnetic fields, coils with more turns exhibit lower magnetization loss, while the losses converge at high fields. These behaviors are observed in both parallel and perpendicular AC magnetic fields.
Consideration: Under parallel magnetic fields, the NI coils behave like a bulk superconductor due to coil-level shielding effect, highlighting the influence of coil geometry and field orientation on loss characteristics.
Conclusion: The findings provide insight into the magnetization loss characteristics of NI coils under high AC magnetic fields and low temperatures, offering guidance for their application in systems such as maglev linear propulsion and superconducting energy storage.
Method: In this work, the magnetization loss of NI coils is numerically investigated using 2D and 3D anisotropic resistivity models based on the H-formulation in COMSOL Multiphysics. The investigation considers a wide range of operating conditions, including external AC magnetic fields up to 1 T, temperatures down to 40 K, frequencies from 0.07 to 200 Hz, different coil turn numbers, and various magnetic field angles.
Results: The simulations show that, under high AC magnetic fields, the magnetization loss increases as temperature decreases. Regarding coil turn numbers, at low AC magnetic fields, coils with more turns exhibit lower magnetization loss, while the losses converge at high fields. These behaviors are observed in both parallel and perpendicular AC magnetic fields.
Consideration: Under parallel magnetic fields, the NI coils behave like a bulk superconductor due to coil-level shielding effect, highlighting the influence of coil geometry and field orientation on loss characteristics.
Conclusion: The findings provide insight into the magnetization loss characteristics of NI coils under high AC magnetic fields and low temperatures, offering guidance for their application in systems such as maglev linear propulsion and superconducting energy storage.