Eddy current loss analysis of non-contact magnetic device with permanent magnets based on analytical field calculations

This paper reports on the analysis of eddy current loss of an MC that uses a Halbach array PM on the basis of an analytical method. Halbach arrays and MC structure are shown. On the basis of the magnetic vector potential and two-dimensional(2-D) polar-coordinate system, the magnetic field solutions of the Halbach magnetized PM is obtained. In addition, using the derived magnetic field solution, analytical solutions for the eddy current density are obtained. Subsequently, the analytical solutions for eddy current loss derived using the equivalent electrical resistance calculated from the magnet volume and conductivity. A 2-D finite element analysis is employed to confirm the validity of the analytical results of the eddy current density and eddy current loss. Finally, this study investigates the influence of number of Halbach segments on the eddy current loss induced on the MC. More detailed analysis results and discussions will be presented in the final paper.