Abstract: Reliability requirement of CRH5 electric multiple unit is more and more high with its wide application, and fault detection for induction motor is critical as the motor is important part of traction system. Firstly, taking the operating condition of induction motor into consideration, an unknown input observer design method is proposed, which has good robustness for the load disturbance. Meanwhile, the resistance of rotor is varied because of special environment so the system matrix is uncertain, the designed observer must be sensitive to faults and robust to the load disturbance as well as the uncertainty so that it can decrease the missing false rate and the false alarm rate; Finally, the designed unknown input observer is applied to the actuator fault detection of the traction motor, and the effectiveness of the proposed method is proved.

Key words: Traction motor, unknown input observer, load disturbance, parameter uncertainty, robust fault detection

摘要： CRH5型动车组的广泛应用使得其可靠性要求越来越高，而异步牵引电机作为牵引系统的重要部分，对其进行实时监测尤为关键。首先，结合CRH5异步牵引电机的工作状态，提出一种未知输入观测器，该观测器对负载扰动具有鲁棒性，同时考虑到牵引电机的工作环境，灰尘和温度都会使得电机转子电阻阻值改变，导致电机系统矩阵具有参数不确定性，于是考虑到实际应用，设计的观测器必须只对故障敏感，对负载扰动和参数不确定项具有鲁棒性，从而减少漏报率和误报率；最后将设计的未知输入观测器应用于牵引电机的执行器故障检测，仿真结果证明了该方法的有效性。

关键词: 牵引电机, 未知输入观测器, 负载扰动, 参数不确定, 鲁棒故障检测