Reliable Detection of Rotor Faults Under the Influence of Low-Frequency Load Torque Oscillations for Applications With Speed Reduction Couplings


Low-frequency torque oscillations in the load will induce frequency components in the vicinity of that of rotor faults (RFs) ensuing in false alarms when applying motor current signature analysis (MCSA). False RF indications due to load oscillations (LO) are most typical in applications that use speed reduction couplings for prime torque, low-speed operation. Recently, ideas for separating RF and LO are proposed in the literature; however, the case where 2 parts overlap at the identical frequency has not been investigated. Many cases where RF- and LO-induced parts are identical are observed in the field by the authors with commercial MCSA equipment. It's shown during this paper that overlap between the 2 parts will manufacture a false positive or false negative indication as a result of they will add or cancel depending on the relative part between the parts. Various choices for reliable RF testing among existing test methods are evaluated and verified during this paper for cases where the two components overlap and produce false indications.

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