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Evaluation of the amplitudes of high-order fault related components in double bar faults

机译：双棒故障中高阶故障相关分量的振幅评估

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This paper addresses the problem of diagnosing cage motors with double bar breakages involving non-consecutive rotor bars. As it is stated in previous works, the conventional diagnosis approaches fail when diagnosing this fault for certain relative positions of the broken bars. This work is focused on the study of the high order harmonics of the airgap-field produced by the fau simple mathematical expressions are deduced which enable to evaluate the influence of the relative position of the broken bars on the amplitude of the fault related components (Left Sideband Harmonic and other high order fault components) of the stator current. These expressions demonstrate to be useful for confirming the diagnostic in uncertain cases; they are validated by finite element simulations and laboratory tests, using different diagnosis methodologies based both on steady-state and on transient analysis.
机译：本文解决了诊断具有非连续转子条的双条断裂的笼型电动机的问题。如先前的工作所述，当针对断条的某些相对位置诊断该故障时，常规的诊断方法会失败。这项工作的重点是研究由断层产生的气隙场的高次谐波。推导了简单的数学表达式，这些数学表达式能够评估断条的相对位置对定子电流的故障相关分量（左边带谐波和其他高阶故障分量）的幅度的影响。这些表达式证明可用于确定不确定情况下的诊断。通过基于稳态和瞬态分析的不同诊断方法，通过有限元模拟和实验室测试对它们进行了验证。

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