How to extend the life of your motor bearings
What happened
ABB explains that variable‑speed drives improve efficiency but produce common‑mode voltage that induces shaft currents and shortens motor bearing life. The article recommends adding shaft grounding devices (or buying motors with them preinstalled) and using an insulated bearing on the opposite end for larger motors. Operationally, missing mitigation means repeat maintenance and higher downtime; watch whether suppliers start offering preinstalled grounding as standard or keep it optional
Why the category manager should care
Treat bearing‑current mitigation as a mandatory technical and commercial requirement because the failure mode directly drives repeat maintenance and downtime
Key facts
- Recommendation to add shaft grounding devices pre‑installation
- Insulated bearing advised on motors larger than 75 kW
- Link made between VSD common‑mode voltage and bearing wear