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Motor bearings: Electrical damage simplified

  • December 2017
  • Number of views: 6713
  • Article rating: 5.0

Joe Junion
L&S Electric,Inc.

Electrical bearing damage has become a very common issue in electric motors. This is not a new problem, but awareness has put the spotlight on this important reliability factor and industry has stepped up to deal with it.

Let’s keep it simple though. Voltage is induced on the rotating member of an electric motor. If the voltage level gets high enough, it will discharge across the thin lubrication film of a bearing and cause damage.

Topics covered in this article include:

  • Effects of arcing
  • Detecting shaft voltage
  • Preventing damage
  • Shaft grounding products
  • Identifying and assessing damage

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EASA/AEMT Rewind Study

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Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

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ANSI/EASA AR100-2020

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Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

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EASA Technical Manual

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Revised September 2022
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.

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