饱和凸极及绕组非对称性对高频信号注入法估计转子位置的影响

摘要

Besides the physical saliencies, there are additional saturation-induced saliencies in permanent magnet motor, which mainly affect the stator leakage inductance. In addition, the rotating magnetic field would become ellipse in shape due to the asymmetry of stator windings. The interaction of these two factors would enhance the negative-sequence current harmonics and bring some error to rotor position estimation. This paper discussed this issue from both hand of theory and experiment, and primitively demonstrated the reason the negative-sequence current harmonics occurred and its effects, and the measures to solve it are also presented.%永磁电机除了物理凸极,还存在由于磁路饱和所产生的饱和凸极,饱和凸极主要对定子漏电感产生影响;电机绕组在物理上也可能不对称,从而产生一个椭圆形的旋转磁场.这两种因素的互相作用,使得高频负序电流的谐波含量增加,给转子位置的估计带来误差.本文对这一问题进行了理论研究和实验验证.初步阐释了负序谐波电流产生的原因及造成的影响,并提出了相应的解决办法.