Design improvement of flux switching permanent magnet using combined local and global method

Abstract

Recently, outer-rotor electric machine become a research attention to be applied for in-wheel motor either in electric or hybrid electric vehicles (EVs). Among the competitor for in-wheel machines, the permanent magnet synchronous machine (PMSMs) with an outer-rotor have been used widely due to their high performances in terms of torque ad power. However, there is drawback cause by demagnetization and mechanical damage of the rotor magnets in extreme driving conditions. Therefore, the initial design of improvement the 12S-14P outer-rotor flux switching permanent magnet machine (ORFSPMM) for in-wheel machine is proposed and analyze to solve the problem. Then, the design has been optimized using combination of local and global optimization methods in order to enhance the design to reach the maximum performances. Finally, the torque performance for optimized 12S-14P ORFSPM has been improved 64.4% higher than initial performance.