Bearing Current Problems

The vast majority of bearing failures in electric motors and electric motor-driven equipment are due to mechanical and thermal causes. However, currents that flow through induction motor bearings can also create premature bearing failure.

In across-the-line driven motors, current-related bearing failures can occur due to a flow of current internally generated in a motor. The increased use of variable speed drives (VSDs) in industrial and commercial electric motor applications is also a source of bearing current flow. It should be noted that inverter-induced bearing currents and premature bearing failures occur in a relatively small percentage of installations and applications. Nevertheless, it's best to be knowledgeable on the topic in the event you run across the problem one day.

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