A Comparative study on the performance of SSDR coreless AFPM generators with conventional and Halbach magnet arrays
Abstract
An axial flux permanent magnet (AFPM) generator is known to be a good candidate for both low and high-speed applications. In this paper, a comprehensive comparison of four coreless AFPM generators are presented with conventional and Halbach magnet arrangement combined with Iron and ironless rotor (epoxy). With the same coreless stator structure, four different AFPM generators with different rotor magnet arrangement and materials are compared in terms of voltage, current, power, machine weight and power density. The analytical design approach is first presented and is subsequently validated using ANSYS Maxwell electromagnetic finite element analysis (FEA) software. It is found that even though coreless AFPM machine with conventional magnet and iron rotor gives the overall best performance, fully coreless topology using Halbach array with epoxy rotor has comparable power density and can be desirable in low scale power applications
