永磁同步电机矢量控制系统频域模型及其应用

Spectral-domain model of PMSM vector control system and its application

针对伺服系统频域分析中模型辨识建模方法过程繁琐且模型物理意义模糊的问题,以永磁同步电机双闭环矢量控制系统为例,给出其频域模型的理论建模方法。使用内模原理以及傅里叶级数研究电流环的等效模型,将逆变器与数字系统采样恢复延迟直接体现在模型中,经过与模型辨识法得出的频响特性以及典型I型系统模型的频响特性进行对比,验证了所得模型的正确性。依据所构建的模型对系统的带宽进行优化,系统带宽扩大至原先的2.5倍。验证结果表明所构建的频域模型与实际系统吻合,这对高性能伺服系统研究具有指导意义。

Aiming at the problem of cumbersome modeling process and fuzzy physical meaning of model identification in frequency domain analysis of servo system, a theoretical modelling approach to its frequency domain model was given, taking a double closed-loop vector control system for a permanent magnet synchronous motor as an example. The equivalent model of current loop was studied using internal mode principle and Fourier series, and the sampling recovery delay of inverter and digital system was directly reflected in the model construction. The correctness of the model was verified by comparing it with the identification model and the frequency response characteristics of a typical Type I system model. The bandwidth of the system was optimized based on the model, and the bandwidth of the system was increased to 2.5 times of the original. The validation results show that the frequency domain model fits the actual system, which is a guiding meaning for the study of high-performance servo systems.