三相电动机的动态特性分析

Analysis on Dynamic Characteristics of Three-Phase Motors

为精确计算三相电动机起动时的机械特性曲线及达到稳定转速时的时间,以ABC坐标系为基础,建立了电动机的动态数学方程组。拟合给出的负载信息并考虑起动过程中转子各参数的变化,解析计算了电动机的动态特性曲线及起动时间。计算结果表明,动态特性曲线比稳态特性曲线更贴合电动机起动时的实际现象,为电动机的选型与设计提供了准确的参考依据。

In order to accurately calculate the mechanical characteristic curve and the time of reaching stable rotating speed of three-phase motor during starting,the dynamic mathematical equation set of the motor is established based on the ABC coordinate system.Combining with the given load information and considering the change of various rotor parameters during starting,the dynamic characteristic curve and starting time of the motor are analyzed and calculated.The calculation results show that dynamic characteristic curve more accurately tallies with the actual starting situation of the motor than that of steady characteristic curve.It can provide accurate reference basis for selection type and design of the motor.