永磁同步电机定子齿磁通分析与偏心故障在线诊断

Tooth flux analysis and eccentricity fault diagnosis for permanent magnet synchronous motor

为提高电机和整个驱动系统的可靠性,建立偏心故障下定子齿磁通的数学模型.根据偏心时定子齿磁通的时间、空间分布特点,提出一种可以全面反映偏心故障及其各项参数的故障特征量.在实时测量定子齿磁通的基础上,提出故障特征量的具体算法以及偏心故障及其类型、方向、程度的诊断方法.仿真和实验结果表明:所提出的方法可以在电机全运行范围内准确、有效地诊断偏心故障;可以对永磁同步电机的偏心情况进行实时监测,有效减小故障带来的损失,提高电机及驱动系统可靠性.

In order to improve the reliability of the motor and the drive system,a mathematical model of stator tooth flux under eccentricity fault was established.Based on the space and time distribution of the tooth fluxes under eccentricity,a fault indicator was proposed which can comprehensively reflect the eccentricity fault and the corresponding parameters.On the basis of real⁃time tooth fluxes measuring,the extraction method of the fault indicator and the diagnosis method for the eccentricity fault and its type,orientation,and severity were proposed.Simulation and experimental results show that the proposed method can diagnose eccentricity fault accurately and effectively in the full range of operation.It can monitor eccentricity in real⁃time,effectively reduce the loss caused by the fault,and improve the reliability of permanent magnet synchronous motor and the drive system.