考虑磁链饱和影响的无速度传感器交流电机控制算法研究

当交流电机气隙磁通发生饱和时,常规的自适应速度估算法无法避免由于电感量的非线性变化带来的影响。提出了一种新型的复合算法,不仅能对电机转速进行识别,而且还能对电感非线性变化进行估算。该算法由定子电压方程和转子磁链观测器的对磁链估算的差值构造而成。还介绍了对传统算法校正方法,以提高速度算法在磁链饱和下的估算精度。最后对本算法进行了仿真和实验研究。

Research on Speed Sensorless Control of Induction Motor Considering the Flux Linkage Saturation

When the air-gap flux of the induction motor is saturated,the conventional adaptive speed estimator cannot avoid the influence of the non-linear inductance variation.In this paper,we propose a novel speed estimator consists of an error between the flux derived the stator voltage equation and the flux estimated from the rotor flux observer.Introducing the correction term into the estimator increases the ability of the conventional speed estimator even though the flux is saturated.Simulation and experiments verify the validity of the proposed method.