Design and Analysis of Less-Rare-Earth Double-Stator Modulated Machine Considering Multioperation Conditions

In this paper, a new less-rare-earth double-stator modulated machine is proposed, where two types of permanent magnets (PM) of rare-earth NdFeB-PM and nonrare-earth ferrite-PM are skillfully integrated into a stator-partitioned modulated machine. The operating principle of the proposed machine is introduced. Considering the multioperation conditions of traction motor for electric vehicle (EV), the new machine design dimension formulas are deduced. Then, the corresponding electromagnetic performances under different driving modes are also analyzed and simulated in details. Both theoretical analysis and the FEM results show that the proposed machine has advantages in multidriving modes, which may be an interesting candidate for EV driving application.