Elimination of broken rotor bars false indications in induction machines

O. Guellout, A. Rezig, S. Touati and A. Djerdir

Mathematics and Computers in Simulation (MATCOM), 2020, vol. 167, issue C, 250-266

Abstract: This work illustrates a method to detect and separate the broken rotor bars (BRBs) from load torque oscillations (LTOs) in motor’s line current signature. The LTOs (due to mechanical load condition abnormalities, load fluctuations like speed reduction couplings or a defective transmission) can introduce similar symptoms as the rotor cage breaks do. The proposed policy is based on the set of two rotating coordinates (same and inverse angular velocity as the current’s fundamental frequency ω) for the stator current vector, and its decomposition into positive and negative components. The extracted components of the positive sequence allow to separate the similar effects produced by rotor defects and the oscillating load . The detection and separation process is performed through the demodulation of the amplitude modulating signal due to BRBs and the phase modulating signal due to LTOs. An experimental test bench has been conducted to validate the simulation results and demonstrate the effectiveness of the proposed approach.

Keywords: Load torque oscillations; Broken rotor bars; Fault detection/diagnosis; Condition monitoring; Induction machine (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:matcom:v:167:y:2020:i:c:p:250-266

DOI: 10.1016/j.matcom.2019.06.010

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