Hydrocarbon Processing Copying and distributing are prohibited without permission of the publisher

Prevent electric erosion in variable-frequency drive bearings

08.01.2010  |  Bloch, H. P.,  Hydrocarbon Processing Staff, 

Here are the reasons and remedial actions

Keywords: [maintenance and reliability] [electric motors] [bearings]

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.

To continue reading please, log in to hydrocarbonprocessing.com.

Subscribe now for premium access and unlimited access to the site, including archived articles and the process handbooks.  Start a free trial to gain access to articles from the current issue of Hydrocarbon Processing. 

Already have an account?


Subscribe today and gain unlimited and immediate access to the site. Plus, you'll receive the next 12 issues of the magazine in your choice of print or digital format. Start your subscription today.

Free trial

Start a free trial and gain immediate access to the current issue of the magazine plus additional, select content.

30 Day Trial

Related articles


Sign-up for the Free Daily HP Enewsletter!

Boxscore Database

A searchable database of project activity in the global hydrocarbon processing industry


Is 2016 the peak for US gasoline demand?




View previous results

Popular Searches

Please read our Term and Conditions and Privacy Policy before using the site. All material subject to strictly enforced copyright laws.
© 2016 Hydrocarbon Processing. © 2016 Gulf Publishing Company.