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July 29, 2026MachinesOpen Access

Explainable Thermographic Fault Diagnosis of Three-Phase Induction Motors Using Transient Thermal Signatures: A Case Study

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Authors

MMMiguel MartínezJAJose A. Antonino‐DaviuLDLarisa Dunai

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Overview

Proof-of-concept case study examining thermal signatures to diagnose induction motor faults, suggesting improved diagnostics methods.

Key Points

  • The study aims to enhance fault diagnosis in three-phase induction motors using transient thermal signatures.
  • Analyzed two faults: cooling failure and 50% phase unbalance using infrared thermography.
  • Employed motor-specific regions of interest and transient thermal descriptors for evaluation.
  • Utilized the Cooling Failure Index (CFI) and Phase Unbalance Thermal Index (PUTI) for fault differentiation.
  • Cooling failure increased maximum radiometric temperature from 77.2 °C to 91.6 °C, with over 43,000 pixels above 80 °C.
  • Phase unbalance showed no hot area expansion above 80 °C in thermal video analysis.
  • The rule-based layer effectively discriminated between cooling failure and phase unbalance using CFI and PUTI.

Cite This Study

Martínez et al. (2026) studied this question.

synapsesocial.com/papers/6a69a26dc8da07d9defa5d99https://doi.org/10.3390/machines14080843
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