摘要
在无速度传感器交流伺服系统中,估计转速受电机定子电阻不确定性影响较大,本文针对该问题进行了研究,提出了改进的MRAS方法.利用永磁同步电机的电流模型作为可调模型,设计了MRAS的自适应律,在传统方法的基础上加入了对定子电阻的估计,并利用控制方法的特点对估计算法进行了简化.最后,在Matlab/Simulink环境下对改进方案进行了仿真研究,结果表明该算法使得转速的估计对电阻的不确定性有较强的鲁棒性,并且使电机能够在较宽的速度范围内正常运行.
For the inaccurate speed estimation in speed sensorless servo system which is caused by the uncertainty of the stator resistance, an improved model reference adaptive system （MRAS） method is proposed in this paper. In this method, the current model of PMSM is regarded as adjustable model. Moreover MRAS＇ adaptive laws which add resistance estimation are designed. And then a simplified model is achieved according to the control strategy. Finally the simulation model is built under the Matlab/Simulink. The result shows that the speed estimation with resistance estimation has strong robustness in the effect of the uncertainty of the stator resistance in a wide range of speeds.
出处
《计算机系统应用》
2013年第7期156-160,共5页
Computer Systems & Applications
