Image credit to the researchers.
Khang Le, Daniel Monagle & Steven B. Leeb
DOI: 10.1109/ACCESS.2026.3678821
Abstract:
Current transformer magnetic energy harvesters (CTMEHs) enable self-powered sensing by converting magnetic energy from AC conductors into usable electrical power. The magnetic core is a critical component in these systems, as its material properties strongly influence harvesting performance. While prior studies have focused on modeling CTMEHs or optimizing performance for a single material, a comprehensive comparison across core materials has remained limited.
Here, we present a systematic evaluation of state-of-the-art magnetic core materials with high permeability and high saturation flux density across a range of transmission line currents and loading conditions. We find that materials with high effective initial permeability perform best in low-current regimes, whereas materials with high saturation flux density excel at higher current levels. Importantly, optimal CTMEH performance requires balancing both properties, as each governs efficiency under different operating conditions.
These results provide practical design guidance for selecting magnetic core materials in energy harvesting systems, advancing the development of robust, self-powered sensors for electrical infrastructure and distributed monitoring applications.