According to recent study, the rare-earth permanent magnet synchronous machine (REPMSM) can save 10% electricity in comparison with the general motors, and the electricity saving rate of the special REPMSM is even up to 15%~ 20%, but the demagnetization fault is prone to occur due to the influence of temperature, armature reaction, vibration and other factors. The demagnetization of permanent magnet results in degradation of motor performance, increases the loss of the machine and even stalls. In this paper, the modeling and simulation of a adjust-speed REPMSM was performed on the basis of the finite element electromagnetic field analysis software Ansoft 13 to simulate the state of demagnetization fault, and study not only copper loss and iron loss of the motor, but also the relationship between demagnetization and loss. The analysis of REPMSM demagnetization fault is very important for taking measures to decrease the demagnetization.%研究表明,与一般电机相比,稀土永磁同步电动机的平均节电率可达10％以上,专用稀土永磁电动机的节电率高达15％～20％.但是,由于该类型电动机采用稀土永磁材料励磁,永磁材料的特性决定了永磁同步电动机在运行时容易受到温度、电枢反应、机械振动等因素影响产生失磁故障,使电机损耗增加、性能下降甚至停转.在此基于有限元电磁场分析软件Ansoft 13对调速永磁同步电动机进行建模仿真,模拟其发生失磁故障的状态,对失磁故障状态下电机的铜耗和铁耗进行定量分析,研究稀土永磁同步电动机失磁程度与电机损耗的动态关系.这些研究表明在电机设计和运行过程中采取措施降低其不可逆失磁是非常重要的.
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