UAB CRAFT Bearings (LTU) supplies traction motor components for European intercity trains and suburban EMUs. Standard bearings failed early from electrolytic corrosion.
Variable shaft voltage during acceleration and braking forms conductive loops, while persistent tunnel humidity accelerates corrosion failure.
Provide alumina coated insulated bearings that cut off the shaft current circuit, resist damp tunnels, and extend full vehicle maintenance cycles.
Stray shaft current creates conductive loops; sparks damage grease, rolling elements and raceways.
Tunnel humidity penetrates micro-pores, lowering insulation resistance and creating leakage risk.
Frequent start-stop generates sharp pulses that coatings must survive without cracking.
High-purity alumina layer controlled at 70-160um, withstanding 1000V arcing and 3000V DC.
A sealed top layer blocks water vapor penetration and prevents insulation attenuation.
100Moh minimum at 500V DC and 50Moh at 1000V DC, stable in damp tunnel service.
Impulse voltage and humidity profiling, salt-spray and HV bench tests, on-line trial, then mass production.
Shaft-current corrosion faults were fully eliminated, the bearing overhaul cycle reached 6 years, and all batches passed mandatory EU rail electrical safety certification.
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