Frequently Asked Questions & Answers
Insulated Bearings
Question: What is the purpose of bearing insulation?
Answer: Bearing insulation is required to prevent circulating rotor currents which can damage bearings. U.S. Electrical Motors’ practice is to insulate the non-drive end shaft bearing journal with a ceramic (aluminum oxide) coating. Insulated sleeve bearings are purchased with the outer diameter insulated by the bearing manufacturer. Insulated bearings are provided as standard on the following TITAN products:
- All 6-pole motors
- Vertical motors 5800 frame and larger
- Horizontal motors 6800 frame and larger
- Motors for inverter duty applications
- Sleeve bearing motors
- Or Any product by customer request - TITAN or NEMA size
(at additional cost to customer).
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