Our material R&D team just finished preprint of the research paper “The Effect of Hydrostatic Stress on Magnetic Properties of Mn-Zn Power Ferrites at Varying Excitation Levels”. The paper clearly shows that core loss increases significantly when the magnetic material is subjected to high pressure as a magneto-mechanical effect.
This observed phenomenon has significant implications, especially in applications like Wireless Power Transfer (WPT), where the transmitter coil is embedded into a road or floor. The difference in performance can be quite substantial when comparing the coil’s efficiency before and after the embedment. To achieve optimal efficiency and performance in WPT, additional precautions and design considerations must be taken into account when enclosing the transmitter coil that is being embedded into a load-bearing surface such as a road or a floor. The understanding of this effect will help mitigate the adverse effects of pressure on the system.
In a recent article “Composite magnetic materials development for application in inroad charging systems” researchers from the University of Auckland, leading in WPT research, noted: „Although ferrite is good for guiding magnetic fields, it is very brittle and a large solid block of ferrite would not survive within a road’s structure “.
The detailed testing method and results are shown in the preprint of research paper below.