A Method of Metal Interference Suppression by Circular Internal Flux for Rotating Wireless Power Supply System

Wireless power transfer (WPT) systems with rotating coupling mechanisms often use both radially and circumferentially located metals for encapsulation purposes. Under the influence of a magnetic field, an eddy current effect occurs which leads to changes in system parameters and efficiency. Temperature increases in metals due to eddy current losses can also impact system safety. This article proposes a new rotary coupling mechanism that utilizes the principle of internal circulation of magnetic flux path. A magnetic field distribution model that includes metal is created, and the strength of the eddy current effect is analyzed. To minimize the coupling between the coupling mechanism and the metal, the β -function is used to optimize the coil, and the optimal number of design turns N _e is selected. The simulation and experimental results indicate that the suppression method presented in this article can reduce parameters, such as self-inductance and mutual inductance by less than 3%, even in an environment that is significantly affected by iron. The system efficiency can be sustained at 81.72%. The proposed method's effectiveness was proven as the waveform experienced no significant distortion and the temperature rise of the metal was smaller when compared with the control group.