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中文摘要：
速度辨识是无速度传感器直接转矩控制的核心问题。提出了一种利用电机状态方程和转矩方程直接推导出的新型速度自适应辨识方法,与以往的利用观测器稳定性理论推导出的速度辨识方法相比,能大大降低了转矩脉动对速度辨识的影响,提高了辨识精度与观测器的稳定性。此外,利用Lyapunov稳定性理论,构造新的Lyapunov函数,从理论上严格证明磁链观测器在全速范围内的稳定性,尤其是保证系统在低速度范围内的稳定运行。研究结果表明：基于电机转矩方程推导出的速度辨识方法具有很高的辨识精度且系统在全速范围内都可以获得良好的动静态性能。
英文摘要：
The speed identification is the core question of the speed-sensorless direct torque controlled induction motor.A novel adaptive speed identification method was proposed based on torque equation and state equation.Compared with the former one deduced by the observer stability theory,it can decrease torque ripple＇s influence to the speed identification greatly and so that it improves the identification accuracy and the stability of speed observer.Otherwise,by using Lyapunov theorem and setting new Lyapunov function,it strictly proves the stability of flux observer in theory.The result shows that the speed is estimated very precisely and the system is capable of working from very low speed to high speed and exhibits good dynamic and steady-state performance.
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