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Two Current-Based Methods for the Detection of Bearing and Impeller Faults in Variable Speed Pumps

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  • Vincent Becker

    (University of Applied Sciences Kaiserslautern, Schoenstraße 11, 67659 Kaiserslautern, Germany
    Technological Institute of Energy, Polytechnic University of Valencia (UPV), Camino de Vera s/n, 46022 Valencia, Spain)

  • Thilo Schwamm

    (University of Applied Sciences Kaiserslautern, Schoenstraße 11, 67659 Kaiserslautern, Germany)

  • Sven Urschel

    (University of Applied Sciences Kaiserslautern, Schoenstraße 11, 67659 Kaiserslautern, Germany)

  • Jose Alfonso Antonino-Daviu

    (Technological Institute of Energy, Polytechnic University of Valencia (UPV), Camino de Vera s/n, 46022 Valencia, Spain)

Abstract

The growing number of variable speed drives (VSDs) in industry has an impact on the future development of condition monitoring methods. In research, more and more attention is being paid to condition monitoring based on motor current evaluation. However, there are currently only a few contributions to current-based pump diagnosis. In this paper, two current-based methods for the detection of bearing defects, impeller clogging, and cracked impellers are presented. The first approach, load point-dependent fault indicator analysis (LoPoFIA), is an approach that was derived from motor current signature analysis (MCSA). Compared to MCSA, the novelty of LoPoFIA is that only amplitudes at typical fault frequencies in the current spectrum are considered as a function of the hydraulic load point. The second approach is advanced transient current signature analysis (ATCSA), which represents a time-frequency analysis of a current signal during start-up. According to the literature, ATCSA is mainly used for motor diagnosis. As a test item, a VSD-driven circulation pump was measured in a pump test bench. Compared to MCSA, both LoPoFIA and ATCSA showed improvements in terms of minimizing false alarms. However, LoPoFIA simplifies the separation of bearing defects and impeller defects, as impeller defects especially influence higher flow ranges. Compared to LoPoFIA, ATCSA represents a more efficient method in terms of minimizing measurement effort. In summary, both LoPoFIA and ATCSA provide important insights into the behavior of faulty pumps and can be advantageous compared to MCSA in terms of false alarms and fault separation.

Suggested Citation

  • Vincent Becker & Thilo Schwamm & Sven Urschel & Jose Alfonso Antonino-Daviu, 2021. "Two Current-Based Methods for the Detection of Bearing and Impeller Faults in Variable Speed Pumps," Energies, MDPI, vol. 14(15), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4514-:d:601881
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    References listed on IDEAS

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    1. de Almeida, Anibal T. & Fonseca, Paula & Falkner, Hugh & Bertoldi, Paolo, 2003. "Market transformation of energy-efficient motor technologies in the EU," Energy Policy, Elsevier, vol. 31(6), pages 563-575, May.
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    Cited by:

    1. Toomas Vaimann & Jose Alfonso Antonino-Daviu & Anton Rassõlkin, 2023. "Novel Approaches to Electrical Machine Fault Diagnosis," Energies, MDPI, vol. 16(15), pages 1-4, July.

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