Influence of Stator Core Materials on Electromagnetic Performance of YASA Type Axial Flux Permanent Magnet Machines

Stator core materials have important impacts on the electromagnetic performance of electric machines. In order to meet the different design requirements of machine, it is very important to understand these impacts in the initial design phase. In this paper, based on these four stator core materials of grain-oriented silicon steel (GO), non-oriented silicon steel (NO), soft magnetic composite (SMC) and amorphous alloy (AA), the air-gap magnetic density, no-load Back-EMF, output torque, torque ripple, inductance, core loss and efficiency of a Yolkless And Segmented Armature (YASA) type axial flux permanent magnet machine are analyzed by the finite element analysis (FEA), in order to provide a design reference for selecting the appropriate stator core materials. The results show that choosing GO as the stator core material can maximize the output torque, no-load back-EMF amplitude and inductance of the YASA machine, choosing SMC can minimize the no-load back-EMF harmonic distortion and torque ripple, and choosing AA can maximize the efficiency of YASA machine. It provides an initial design reference for YASA machine.