Flux-switching permanent magnet (FSPM) motors have gained increasing attention in\nelectric vehicles (EVs) applications due to the advantages of high power density and high efficiency.\nHowever, the heat sources of both permanent magnet (PM) and armature winding are located on the\nlimited stator space in the FSPM motors, which may result in the PM overheating and irreversible\ndemagnetization caused by temperature rise, and it is often ignored in the conventional thermal\nanalysis. In this paper, a new electrical-thermal two-way coupling design method is proposed to\nanalyze the electromagnetic performances, where the change of PM material characteristics under\ndifferent temperatures is taken into consideration. First, the motor topology and design equations\nare introduced. Second, the demagnetization curves of PM materials under different temperatures\nare modeled due to PM materials are sensitive to the temperature. Based on the electrical-thermal\ntwo-way coupling method, the motor performances are evaluated in detail, such as the load PM\nflux linkage and output torque. The motor is then optimized, and the electromagnetic performances\nbetween initial and improved motors are compared. Finally, a prototype motor is manufactured,\nand the results are validated by experimental measurements.
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