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How to extend the life of your motor bearings
Signal strongSource-grounded
What happened
A technical how‑to explains that variable‑speed drives create common‑mode voltages and shaft currents that accelerate bearing wear and recommends shaft grounding, insulated bearings and grounding isolation as mitigations. The author notes larger motors usually require an insulated bearing on the non‑grounded end and that preinstalling grounding devices can be cheaper than repeated replacements. Watch whether suppliers begin offering integrated motor packages that bundle these mitigations and limit spare interchangeability
Why the category manager should care
Treat grounding and insulated bearings as contract-level deliverables to avoid recurring reactive spend and supplier lock‑in
Key facts
- Discussion of VSD common‑mode voltage as the failure mechanism
- Guidance to fit insulated bearing on the opposite end for larger motors
- Table comparing shaft‑grounding methods and trade‑offs