In order to improve the asynchronous motor speed sensorless vector control system of low speed performance and reduce the sensitivity of the change of motor parameters, and proposes an improved rotor flux estimation method, based on model reference adaptive (MRAS) observation speed. The simulation results show that the method of the parameters of the motor change good robustness, flux estimation precision, fast convergence rate, low speed stable performance. Based on the improvement of the flux observer as reference model can realize asynchronous motor speed sensorless vector control system of high performance operation.% 为了提高异步电机无速度传感器矢量控制系统的低速性能以及降低对电机参数变化的敏感性，提出了一种改进的转子磁链估算方法，基于模型参考自适应（MRAS）观测转速。仿真研究表明，该方法对电机参数变化的鲁棒性好，磁链观测精度高，收敛速度快，低速性能稳定。基于该改进的磁链观测器作为参考模型，可实现异步电机无速度传感器矢量控制系统的高性能运行。
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