起动条件对永磁电动机退磁状况的影响

Effect of starting conditions on demagnetization of permanent magnet motors

本文研究了一台W型钕铁硼永磁体自起动永磁同步电动机在起动过程中的退磁情况,分析了同一永磁体不同点的退磁状况,以及施加不同负载与不同电压时对永磁体的退磁的影响,并得出永磁体边角处更易退磁、低压起动及重载起动时永磁体退磁风险较大3个主要结论。就降低电动机退磁风险提出了一种解决方案,对实际运行中分析永磁体性能和改进电动机设计具有重要意义。

In this paper,the demagnetization of a line-start permanent magnet synchronous motor with W-type NdFeB permanent magnet is studied during start process.The demagnetization status of different points of the same permanent magnet is analyzed.In addition,the influence of demagnetization on permanent magnets under different loads and different voltages are also analyzed.The paper shows that corners of permanent magnets are easier to demagnetize and the risk of permanent magnet demagnetization is greater under low voltage start and heavy load start.The method to reduce the risk of motor demagnetization is proposed in this paper,which provides guidance for analysis of permanent magnet performance and improvement motor design in actual operation.