一种无测速定子磁链观测器的研究

Study of a Stator Flux Observer without Encoder

磁链观测在磁场定向控制方法中有着举足轻重的作用，直接转矩控制依赖定子磁链的观测，由于U－I观测模型不需要测速器，相对于I－ω是有优势的。在使用U－I模型时只受定子电阻Rs一个量影响，尤其是在低速时Rs的偏差起很大的作用。本文讨论了近期提出的一种定子磁链辨识方法，完善了它的理论基础，将它和其他几种方法作了比较，并做了一些仿真工作说明了分析的正确性。

The flux observer plays an important role in field oriented control. The direct torque control method is dependent of stator flux. U-I stator flux observer model have advantage against I-ω model since the former one don’t require encoder. Re sistance of stator R s affects the U-I obs erver’s result, especially in low speed. Thus the on-line tuning of R s is of great value. This paper discusses a method pub lished in these years, perfects its theory foundation and does some comparison w ith other adaptive methods. Some simulations are done to prove the analysis.