永磁同步电动机系统模型辨识

System Model Identification of Permanent Magnet Synchronous Motor

永磁同步电动机是一个强耦合非线性系统,难以建立准确模型,而机理建模存在一定的舍入误差。针对这一问题,在id=0控制策略实现状态方程解耦的基础上,运用多正弦方法辨识出系统轴输入电压与输出转速的线性传递函数,通过对比线性传递函数与实际系统信号的幅频特性和相频特性曲线表明,在低频段辨识出的线性传递函数模型可以很好的描述实际系统行为。

Because of coupling and nonlinear in permanent magnet synchronous motor, it is difficult to establish accu- rate model and modeling by knowing mechanism result in rounding errors. The control strategy ia = 0 was used in this paper to deeouple the system state equation and the identification method of multi-sinusoidal was used to indentify the transfer function of AC permanent magnet synchronous motor between q axis input voltage and output speed. By comparing the am- plitude frequency characteristics and phase frequency characteristic curve of the signal of the linear transfer function and practical system, it is clear that identify the linear transfer function model can well described the actual system behavior at low frequency.