In U-I model, the measurement of stator current will influence the EMF, and finally the magnitude and phase of flux, resulting in the inaccurate orientation, bad performance and instability.

• U-I模型中，定子电流的检测精度势必影响到电机反电动势的计算，最后影响磁链的大小和相位，导致磁场定向不准确，系统性能不好，工作不稳定。