异步电机转子磁场定向无速度传感器矢量控制方法

Study on rotor flux oriented speed sensorless vector control method of induction motor

为解决低速下无速度传感器矢量控制速度辨识效果差的缺点，基于一种电压直接控制的矢量控制结构，设计了一种无速度传感器的控制方案。该结构采用转子磁场定向，实现磁链与转矩的解耦控制，利用模型参考自适应方法的原理，对转矩的误差项采用此例积分自适应机制，获取速度信号，实现速度闭环控制。实验结果表明，该方法实用简单，在低速下可获得良好的性能。

Speed sensorless vector control is the key technique in high performance application. In order to improve the performance of speed estimator at low speed, a speed sensorless control method based on a novel vector control is proposed. Rotor flux orientation is adopted to realize flux and torque decoupling. Speed estimation is obtained according to the error information of torque through a proportional integration adaptive mechanism based on the theory of model reference adaptive control (MRAC). It is demonstrated that estimated speed can trace the real speed very quickly and good performance is attained in low speed range.