A Flux Reversal Permanent Magnet Motor With Uneven Magnetomotive Force Shift

Flux reversal permanent magnet (FRPM) motors have been perceived as promising candidates for various applications, such as electric vehicles and aerospace. However, FRPM motors usually confront low torque density due to an inherent characteristic of low utilization of permanent magnets. In this article, an uneven magnetomotive force shift design is employed for an FRPM motor to emerge new working harmonics and improve the torque density. Based on the general field modulation theory, the principle is discussed. Moreover, by finite element analysis, the electromagnetic performance comparisons are made among the proposed motor and its two counterparts. The results reveal that the proposed motor exhibits the highest average torque and efficiency.