Measurement of Eddy Current Losses in Plane Conductors in a Time-Varying Magnetic Field

Nanocrystalline Flake Ribbon (NFR) is a magnetic material suitable for replacing conventional ferrite in core designs for wireless power transmission applications. How to measure the conductivity of NFR is an urgent problem. This paper proposes a method for measuring eddy current losses in conductive materials under uniform magnetic fields, providing a solid foundation for subsequent upcoming work on NFR conductivity measurement. A UU-shaped ferrite is used to generate a uniform time-varying magnetic field, an LCL resonant circuit is used to generate the excitation, and a partial cancellation method is used to measure the loss. The method is very accurate when the radius of the conductive material is small. As the radius of the conductive material increases, the method becomes less effective.