针对感应电机转子发生早期断条故障时,定子电流故障特征频率容易被基波频率淹没,导致电机转子断条故障发现不及时的问题,采用多回路方程建立感应电机发生转子断条故障的模型,推导了dq0坐标系下感应电机发生早期断条故障的模型。在该故障模型的基础上,利用参数辨识和滑窗技术得到电机等效参数变化曲线。该方法得到的电机等效参数曲线对转子早期断条故障具有明显的故障特征信号,通过辨识曲线特征可诊断电机转子断条故障,同时给出了转子发生不同程度故障时的差异指标。最后试验验证了该方法的可行性。

For the early broken rotor bars fault of induction motor, the fault characteristic frequency of the stator current was easily submerged by the fundamental frequency, so the broken rotor bars fault of motor could not be detected in time. Multiple coupled circuit equation was used to establish the model of the broken rotor bars fault occurring in induction motor, and the model of the early broken rotor bars fault of induction motor in dq0 coordinate system was derived. Based on the fault model, the variation curves of motor equivalent parameters were obtained by parameter identification and sliding window technology. These curves had obvious fault characteristic signals for the early broken rotor bars fault, and the characteristics of the curves could be used to diagnose the broken rotor bars fault. The different indexes of the rotor faults with different degrees were given. The experiment verified the feasibility of the proposed method.

TM 346