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中文摘要：
针对一般速度自适应磁链观测器速度辨识方法在低速发电状态下的不稳定问题，提出了一种新的基于观测器的异步电机无速度传感器控制方法。应用鲁棒控制理论、利用Matlab的LMI工具箱求解2个双线性矩阵不等式（BMIs）得到观测器的增益矩阵，并结合Lyapunov稳定性理论推出速度自适应律。将该速度辨识方法应用到牵引电机直接转矩控制系统中，进行了Madab仿真和实验验证,仿真和实验结果表明该方法在全速度范围各种工况下都能稳定工作，准确辨识转速，克服了已有速度辨识方法在低速发电状态的不稳定问题。
英文摘要：
For instability problem in low speed generating mode of general speed identification method based on speed adaptive flux observer, this paper presents a new speed sensorless control method of asynchronous motor based on observer, it utilizes robust control theory and Matlab＇s LMI Toolbox to solve two bilinear matrix inequalities （BMIs） to get observer gain matrix, and then develops speed adaptive scheme considering Lyapunov stability theory. Apply this speed identification method into direct torque control system of traction motor, the simulation in Matlab and experimental results verify its stability and validity of speed identification in whole range of speed, solve the problem of instability of existed speed identification methods in low speed generating mode.
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