异步起动永磁同步电动机起动过程中永磁体平均工作点的解析计算

摘要

When finite element method (FEM) is adopted to study the variation of magnets' operating point in line-start permanent magnet synchronous motor (LSPMSM) during the starting process,the computation is time consuming.Thus FEM is not suitable for the fast calculation at the motor design stage.To solve this problem,the analytical model to calculate the variation of magnets' average operating point during the starting process of LSPMSM was established by combining the dynamic mathematical model and magnetic circuit model of LSPMSM.The variations of magnets' average operating point during the starting process of three prototype motors were calculated by the above analytical model.And magnets' average operating point when the severest demagnetization field during the starting process occurs as well as magnets' average operating point when the motor operates stably were obtained.Accuracy of the analytical calculation model was validated by comparing with the result of FEM.Thus,the established analytical model can benefit fast design of LSPMSM.%针对采用时步有限元法研究异步起动永磁同步电动机起动过程中永磁体工作点的变化时存在计算时间长、不适合电机设计阶段的快速计算的问题,通过将异步起动永磁同步电动机的动态数学模型和磁路计算模型结合,建立了异步起动永磁同步电动机起动过程中永磁体平均工作点的解析计算模型.利用该解析计算模型计算了3台样机起动过程中永磁体平均工作点的变化,分别得到了电机起动过程中最大退磁磁场出现时的永磁体平均工作点和电机稳定运行时的永磁体平均工作点.通过与有限元法的计算结果作比较,验证了该解析计算模型的准确性,可为该类电机的快速设计提供参考.