Comparison of A Multi-Stage Axial Flux Permanent Magnet Machine With Different Stator Core Materials

This paper proposes a multi-stage axial flux permanent magnet machine (MAFPMM) and the properties with different stator core materials are analyzed. The mentioned MAFPMM has three rotor-disks and two stator-disks. As a key part of the flux path, stator core of silicon steel sheet, soft magnetic composite (SMC) and amorphous magnetic metal (AMM) are studied by three dimensional (3-D) finite element method (FEM), respectively. The performances such as flux density distribution, no-load back-electromotive force (EMF), cogging torque, output torque, and core loss are analyzed. FEM results indicate that the three materials have almost equal influence on flux density distribution, no-load back-EMF, cogging torque, and output torque. But in terms of core loss, difference appears between silicon steel sheet, SMC and AMM. Considering the disadvantages in mechanical property of AMM and silicon steel sheet, a prototype is fabricated using SMC stator core. The FEM results are verified by the experimental results of the prototype.