永磁同步电机转动惯量辨识方法研究

Study on Moment of Inertia Identification Method for Permanent Magnet Synchronous Motors

永磁同步电机结构简单、性能优越,在众多领域应用广泛。在伺服控制等高性能电机驱动领域,需对转动惯量进行精确的辨识。基于带遗忘因子的递推最小二乘法,给出了电机转动惯量辨识的实现流程,分析了注入的扰动波形及采样的随机噪声对转动惯量辨识的影响,对正弦波、三角波及方波三种典型扰动注入方式进行了比较与分析,通过对不同扰动波形下辨识效果的量化对比,认为方波注入方式具有更好的辨识效果和收敛速度,并在仿真平台对一台750 W/3000 r/min永磁同步电机进行了验证。

Permanent magnet synchronous motors(PMSM)have simple structure and superior performance,and are widely used in many fields.In the field of high-performance motor drives,such as servo control,it is necessary to accurately identify the moment of inertia.This study focused on analyzing influences of injected disturbance waveform and sampled random noise on the identification of moment of inertia using the identification method based on recursive least squares with forgetting factor.It carried out quantitative comparison on the identification utilities with three different typical perturbation injection methods,i.e.,triangle wave injection,sine wave injection,and square wave injection,and found that better identification utility and faster convergence can be achieved by the square wave injection.It also performed simulative verification on a 750 W/3000 r/min PMSM.