Elimination of saturation effects in sensorless position controlled induction motors
Elimination of saturation effects in sensorless position controlled induction motors
复制标题
消除无传感器位置控制感应电机的饱和效应
DOI：
10.1109/tia.2004.824435
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
H. Pan
中科院分区：
文献类型：
--
作者：
J. Holtz;H. Pan
由于异步电动机定子绕组与转子离散线棒之间存在着可变的磁耦合，通过瞬时测量定子三相总漏感，可以获得准连续的转子位置信号。信号的采样与PWM过程的常规换向同步，从而使额外的高频载波注入过时。获得的位置信号具有高空间分辨率和高动态带宽。磁饱和也会影响总漏感，从而对位置识别构成干扰。本文详细分析了饱和效应，并提出了消除饱和效应对位置信号影响的方法。最后给出了在满载和高动态性能下的闭环无位置传感器位置控制的实验结果。
Owing to the variable magnetic coupling between the stator windings and the discrete rotor bars of an induction motor, a quasi-continuous rotor position signal can be acquired by instantaneous measurement of the total leakage inductance of the three stator phases. The signals are sampled in synchronism with the regular commutations of the PWM process, thus making the injection of additional high-frequency carriers obsolete. The acquired position signal exhibits high spatial resolution and high dynamic bandwidth. Magnetic saturation also influences upon the total leakage inductances and hence constitutes a disturbance for position identification. The paper presents a detailed analysis of the saturation effects and proposes methods to eliminate their undesired impact on the position signal. Experimental results of closed loop sensorless position control at full load and high dynamic performance are presented.