多相永磁同步电机磁场解析建模与容错性能分析

Magnetic Field Analytical Modeling and Fault Tolerance Analysis of Multiphase Permanent Magnet Synchronous Motor

为了快速、准确计算多相永磁同步电机(PMSM)在一相或多相绕组故障发生时的容错运行能力,基于傅里叶级数分析方法,在二维极坐标系下建立了多相内转子表贴式永磁同步电机(SPMSM)绕组缺相不对称运行下的空载、负载磁场解析计算模型,并对气隙磁密、空载反电动势(EMF)以及电磁输出转矩等性能参数进行准确计算。设计制作一台44极48槽12相船舶用内转子SPMSM,并通过有限元分析和试验测试对磁场解析模型的准确性进行了验证。在此基础上,为了提高多相电机的容错能力,以最小等值相电流为优化目标,建立了多相电机驱动系统一相绕组开路故障容错控制策略,并以电磁输出转矩、转矩脉动等性能参数为考核指标,对12相SPMSM的容错性能进行了深入分析,进一步提高电机驱动系统的可靠性。

In order to quickly and accurately calculate fault tolerant operation capability of multiphase permanent magnet synchronous motor(PMSM) at asymmetrical fault condition, an analytical model of no-load and on-load magnetic field of multiphase inner rotor surface permanent magnet synchronous motor(SPMSM) under asymmetrical fault condition is proposed by the Fourier series analysis method in the two-dimensional polar coordinate system. The performances such as air gap magnetic density, no-load back electromotive force(EMF) and electromagnetic output torque are calculated accurately. A 12-phase inner rotor SPMSM with 44-poles and 48-slots for ship is designed and manufactured, and the accuracy of proposed model is validated by finite element analysis and test. On this basis, in order to improve the fault tolerance ability of multiphase PMSM, a fault tolerant control strategy for open circuit fault of one phase winding of multiphase motor drive system is established with minimum-phase current as the optimization goal. Taking the performances such as electromagnetic output torque and torque ripple as evaluation indexes, the fault tolerant performance of 12-phase SPMSM is analyzed to further improve the reliability of motor drive system.