How to extend the life of your motor bearings
What happened
A ProcessOnline technical piece explains that variable speed drives (VSDs) can introduce common-mode voltages that drive shaft currents and shorten motor bearing life. The article highlights shaft-grounding devices, insulated bearings and grounding isolators as practical mitigations and recommends fitting them before installation where possible. This is operationally real for LTSAs because it changes spare-part needs, retrofit scope and maintenance frequency—watch supplier quotes for how they price these mitigations
Why the category manager should care
Treat VSD-induced shaft currents as a contract and spare-parts issue: specify mitigations and who pays before work begins
Key facts
- Common-mode voltage from VSDs identified as a root cause of shaft currents
- Practical mitigations: shaft grounding devices, grounding bearing isolators, insulated bearings
- Recommendation to fit grounding before installation on critical motors