无速度传感器异步电动机极低转速下的磁通位置观测

Rotor Flux Position Detection of a Speed Sensorless Induction Motor Drive at Very Low Speed

在分析了异步电动机在高频脉振信号注入下的电机模型的基础上 ,得到了异步电机同步参考坐标系下的阻抗不对称的特点。提出了磁通跟踪的方法 ,通过检测高频脉振信号注入时的响应电流 ,以便观测转子的磁通位置。实验结果表明 ,上述方法在异步电动机极低转速 (包括零速 )

This paper presents a novel method of estimating of rotor flux angle of an induction machine by injecting high frequency signal at very low speed range included zero. When the high frequency fluctuating signal is injected into the terminal of an induction machine, the difference of impedance between d-axis and q-axis of the synchronous rotating reference frame can be measured. So the rotor flux angle is tracked by tuning the space vector of high frequency signal. Experimental results are provided to verify that this algorithm is robust against parameters variation and load change.