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Study on electromagnetic characteristics of cylindrical hole defect in variable parameter traction motor shaft based
Mengmeng Song1, Tingting Zhu1,2, Shungen Xiao1
1Ningde Normal University, School of Information Engineering, Ningde, People's Republic of China.
Plos One
|February 17, 2026
Summary
This study uses eddy current testing to detect corrosion defects in motor shafts. Horizontal magnetic field intensity quantifies defect size, while amplitude variations assess depth, ensuring equipment safety.
Area of Science:
- Materials Science
- Mechanical Engineering
- Electromagnetism
Background:
- Locomotive traction motor shaft integrity is critical for operational reliability and safety.
- Cylindrical hole defects, such as corrosion, pose a significant risk to these components.
- Non-destructive testing methods are essential for early defect detection.
Purpose of the Study:
- To investigate the influence of variable-parameter cylindrical hole defects on the electromagnetic properties of traction motor shafts.
- To develop and analyze a simulation model for detecting corrosion defects using eddy current testing.
- To establish a method for quantitative and qualitative assessment of shaft defects.
Main Methods:
- Utilized COMSOL software to create an equivalent model of a variable-parameter defect detection system.
- Performed simulation analysis based on eddy current testing theory.
- Analyzed magnetic field distribution by studying horizontal and vertical magnetic induction intensities (HMII, VMII) and their phases (PHMII, PVMII).
Main Results:
- Horizontal magnetic induction intensity (HMII) and its phase show a strong correlation with defect geometry, enabling quantitative assessment of defect bottom diameter.
- Amplitude variations in HMII and VMII can qualitatively identify defects and estimate their relative depth.
- Vertical magnetic induction intensity phase (PVMII) was found to be insensitive to defect geometric parameters.
Conclusions:
- Eddy current testing, particularly analysis of HMII, provides a viable method for quantitative defect size assessment in motor shafts.
- Amplitude variations offer a qualitative approach to defect presence and depth evaluation.
- The developed simulation model aids in understanding and diagnosing corrosion defects in rotating shafts.
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