基于阶跃激励稳态响应的感应电机匝间短路故障诊断方法研究

Diagnosis of Stator Inter-turn Short-circuit Fault in the Induction Machine Based on the Steady-state Response of the Step Excitation

针对感应电机匝间短路故障,提出了一种基于阶跃激励稳态响应的故障诊断方法,并开展了理论与实验分析。首先,针对单相激励下电机不同绕组发生短路的情况,开展了对应电路网络的分析,推导了阶跃响应下电流的解析方程。其次,分析了故障对通路、支路电流阶跃稳态数值的影响,探究了特征矢量空间位置的移动规律。再次,提出了基于阶跃激励稳态响应的故障指标,并利用仿真数据开展了故障指标的数值计算。最后,搭建了实验平台,讨论了不同故障程度、外部干扰下的故障指标测试结果。研究表明,在调速感应电机静止的情况下,提出的方法能够实现定子状态的可靠、便捷诊断,降低了方法对硬件的需求,提高了实际应用价值。

A diagnosis method based on the steady-state response of step excitation was presented for the inter turn short-circuit(ITSC)fault in the induction machine.The theoretical and experimental analysis were carried out,simultaneously.First of all,the circuit network analysis was achieved for the single-phase excitation connection with ITSC in different windings,and the analytical expression of the step response current was derived.Secondly,the influence of the fault on the step steady-state value of the main-path and branch-path current was analyzed,and the discipline of the vector movement in feature space was explored.Moreover,the fault indicator based on the steady state response of step excitation was proposed,and the numerical calculation of the fault indicator was carried out using the simulation data.Finally,the experimental set-up was built to study the variation of fault indicator under different fault severity and external interference.The research shows that,within the time gap of the speed-controlled induction motor operation,a reliable and convenient diagnosis result can be achieved by the proposed method,reducing the hardware requirement and increasing the practical value.