Prevent electric erosion in variable-frequency drive bearings
Here are the reasons and remedial actions
The problem of electric current passing through electrical
machine rolling bearings and causing damage in the inner and
outer ring ball or roller and raceway contact areas has been
known for decades. In addition to the bearing element damage,
it was also understood that the lubricant structure might
change under the influence of a passing current. Both AC and DC
motors potentially suffer from the electric-current passage
phenomenon. However, since the 1990s, increasing use of
variable-frequency drives (VFDs) has had a measurable effect on
the number of motor bearing failures. This article examines the
reasons and recommends remedial action to be considered.
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