NSK Bearings Save 11,500 euros A Year In Mro Activities
The replacement of ball bearings is part of typical maintenance schedules when it comes to electric motors.
However, when a German MRO (maintenance, repair and overhaul) provider was tasked recently with performing regular overhauls of electric drives for a prominent customer, a frequently recurring problem was noted: newly installed standard bearings would fail after three or four months.
Uncertain of the root cause, the MRO provider commissioned NSK to investigate the issue. As part of NSK’s AIP – Added Value Programme, a ball bearing expert scrutinised the bearing failures along with the conditions in which the electric motors were operating.
The AIP investigation revealed that premature failures were occurring due to the penetration of dirt, which in turn was contaminating the lubricant inside the standard ball bearings. As a result, NSK recommended switching to its sealed super precision ball bearings, a solution that proved so satisfactory that these bearings are now used for all electric drive overhauls.
NSK’s sealed super precision ball bearings excel in challenging environments thanks largely to non-contact seals that offer class-leading protection against contamination ingress, an effect that is achieved without any friction increase or motor speed reduction, and with no compromise to the specified energy efficiency of the drives.
For the customer of the MRO provider, the benefits have been extensive. In trials with 65 motors, the Service life or maintenance interval of the electric drives climbed from four to more than 12 months, simply due to the change of bearing. As a consequence, the annual service cost within a one-year period has fallen to zero, compared with
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