风机DTC系统自适应滑模速度和位置研究

Adaptive Sliding Mode Speed and Position Observation of Fans DTC System

针对传感器的存在会增加交流伺服系统的安装难度和故障率、降低系统的跟踪性能等问题,提出了一种自适应滑模速度和位置观测方法。该方法基于反电动势来实现伺服电机的转子位置和速度估计,以实现参数摄动和干扰的鲁棒性。控制策略上用sigmoid函数来代替sign函数中的开关函数,用李雅普诺夫稳定理论进行观测器的稳定性分析,并通过定子电子的自适应更新,提高了系统的稳态性能。最后,通过与传统滑模观测器进行对比,验证了本方法的有效性。

Focus on the problem that the existence of the sensor in the AC servo system will increase the installation difficulty and failure rate,and induce the tracking performance of the system,an adaptiving sliding mode speed and position observation method is proposed.Rotor speed and position estimation is achieved based on back electromotive force,in order to achieve the parameter perturbation and interference robustness.Low-pass filter and rotor position compensation are used in the traditional sliding mode observer reduce the buffeting phenomenon caused by switching function,while the introduction of low-pass filter will cause delay phenomenon.sigmoid function instead of sign function is used for the switching function,and the stator resistance is adaptive updated to improve the steady state performance of the system.The stability of the proposed observation scheme is analyzed according to Lyapunov stability theory.Finally,compared with the traditional sliding mode observer,the effectiveness of the proposed method is verified.