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Detection of Induction Motor Coupling Unbalance through the Analysis of Electrical Quantities under Starting and at Steady-state

It has been recently proven that the combined analysis of motor currents and stray fluxes may bring very useful information to discern between certain failures such as eccentricities and misalignments or load-related problems. This can open a broad range of investigations to analyze in detail how different mechanical failures can be detected and discriminated through the simultaneous analysis of both quantities. This work studies the effect of unbalanced coupling problems on the stator current signals and on the stray flux signals captured both under the motor starting and at steady-state. The results reveal that this fault yields increments in the amplitudes of fault related harmonics in current signals, while the effects on stray-flux fault-related components are much lower. Moreover, the results also show that specific components in the current spectrum can be used as effective means to discriminate between coupling unbalance and other mechanical faults, such as misalignment.