Effect of the Coil Inner Diameter on the Power Transfer Efficiency of an Electromagnetic Halbach Array Wireless Power Transfer System

In this paper, the effect of the inner diameter of the coils on the power transfer efficiency (PTE) of the electromagnetic Halbach array (EHA) based wireless power transfer system has been examined. We have shown that the homogeneity of the magnetic field for the uniform power transfer over a given distance in the EHA is a function of the size of the inner diameter with respect to the outer length of the coil. Ansys Electronic Desktop simulation tool was used to carry out the analysis. It is found that a uniform power transfer can be achieved over long transfer distance using EHA whose coils have smaller inner lengths.