VFD - Motor Bearing Faliure

[Mike01]

Just curious to all of the motor drive members of the forum , in discussions around the ground bearing failure I have seen the ground brush “ring” and this was recently brought to my attention just curious if anyone has any experience with the manufacture and their products?

http://www.coolblue-mhw.com/

 

[Jraef]

Just curious to all of the motor drive members of the forum , in discussions around the ground bearing failure I have seen the ground brush “ring” and this was recently brought to my attention just curious if anyone has any experience with the manufacture and their products?

http://www.coolblue-mhw.com/

No experience with that mfr, but the concept of a ferrite core on the conductors as a way to reduce common mode noise is not new. Some drive mfrs even build them into the drives. The concept HELPS, but is not 100% effective in all circumstances.

They make a statement regarding the routine maintenance of grounding rings as being a big problem, but you have to understand that they are designed to last as long as the bearings, so you replace them together. That right there is a little disingenuous and the fact that they invented a terminology ("inductive absorbers"???) instead of just telling you it's a ferrite core makes me cringe. Smells of snake oil, even though I know the concept is valid to a certain extent.