Search Coil-based Detection of Non-adjacent Rotor Bar Damage in Squirrel Cage Induction Motors

Yonghyun Park, Hanchun Choi, Sang Bin Lee, Konstantinos Gyftakis

Research output: Contribution to journalArticlepeer-review

Abstract

Detection of rotor cage faults in induction motors based on motor current signature analysis (MCSA) is being extensively applied in the field for preventing forced outage of the motor and industrial process. Although MCSA is very effective for detecting broken bars that are adjacent to each other, it can fail if the broken bars are nonadjacent, which is common for applications with frequent starts. If multiple broken bars are spread out at locations where the rotor “electrical” asymmetry is canceled, the presence of broken bars is difficult to detect with MCSA. A false indication can lead to a catastrophic-forced outage, but the only known means of detecting this type of fault in the field is through rotor visual inspection. In this article, the feasibility of detecting nonadjacent broken rotor bars from the rotor rotational frequency sideband components in the internal and external search coil measurements during steady state and motor starting is evaluated. Experimental testing on a 7.5-hp induction motor shows that nonadjacent broken bars can be reliably detected from the analysis of flux measurements for cases where MCSA and all other electrical tests fail.
Original languageEnglish
Pages (from-to)4748 - 4757
JournalIEEE Transactions on Industry Applications
Volume56
Issue number5
Early online date8 Jun 2020
DOIs
Publication statusE-pub ahead of print - 8 Jun 2020

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