Modelling of Bearing Lubrication for Electric Vehicle Motor Bearing
Bearing failure in electric motors is increasingly attributed to complex electro-thermal interactions that accelerate surface damage and lubricant degradation. Electrical current discharge disrupts the lubricant’s rheological properties, diminishing film thickness and undermining protection in...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | en |
| Published: |
Penerbit UTM Press
2025
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/48690/1/1_241_%281-8%29.pdf http://ir.unimas.my/id/eprint/48690/ https://jtse.utm.my/index.php/jtse/article/view/241 https://doi.org/10.11113/jtse.v12.241 |
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| Summary: | Bearing failure in electric motors is increasingly
attributed to complex electro-thermal
interactions that accelerate surface damage
and lubricant degradation. Electrical current
discharge disrupts the lubricant’s rheological
properties, diminishing film thickness and
undermining protection in the
elastohydrodynamic lubrication regime. This
study presents a numerical model that
integrates EHL theory with heat generation
from shear and electrical sources while
capturing the influence of key operating
parameters such as shaft speed, bearing
resistivity, and temperature. The findings reveal
that current discharge markedly reduces
minimum film thickness and distorts pressure
distribution due to localised temperature rise
and viscosity breakdown. The model
demonstrates strong predictive capability by
capturing the coupled effects of entrainment,
rheological degradation, and electro-thermal
loading. These results underscore the sensitivity
of EHL film formation to electrical stress and
highlight potential failure thresholds under
realistic operating conditions. The insights
gained can inform the development of
advanced bearing systems with enhanced
thermal management, electrical insulation, and
lubricant formulation strategies, ultimately
improving the durability and reliability of
electric motor drivetrains. |
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