Monarchist
Diamond
- Joined
- Oct 2, 2012
- Location
- Sol, Terra
The subject comes up now and then that VFD"s can - not always DO - damage the bearings in a motor.
Too often we argue over it when we need not, and vaguely point to photos of the evidence online "somewhere" to support the observation.
Here is something more specific that is easier to find. May even be worth making it a "sticky" so we do not need to discuss it again, and again, every few months, forever:
Shaft Grounding - Helwig Carbon
Note the damaged bearing in the photo. There is a link covering Electrostatic discharge management in general - VFD not necessarily involved, nor even a motor. Also a "white paper" for download.
CAVEAT: Helwig Carbon is primarily a manufacturer of BRUSHES for motors. That implies DC motors, at least "mostly".
They, of course, have competition, both as to brushes in general and use of brushes in the protective devices shown on the cited page.
OTOH, they have spawned a line of business with multiple volume-produced product-offerings to address a problem.
Such a problem must then actually exist, out there in the wild, even if - as said - "not always".
FWIW - Helwig or any other maker - brushes are not the only solution, either.
Too often we argue over it when we need not, and vaguely point to photos of the evidence online "somewhere" to support the observation.
Here is something more specific that is easier to find. May even be worth making it a "sticky" so we do not need to discuss it again, and again, every few months, forever:
Shaft Grounding - Helwig Carbon
Note the damaged bearing in the photo. There is a link covering Electrostatic discharge management in general - VFD not necessarily involved, nor even a motor. Also a "white paper" for download.
CAVEAT: Helwig Carbon is primarily a manufacturer of BRUSHES for motors. That implies DC motors, at least "mostly".
They, of course, have competition, both as to brushes in general and use of brushes in the protective devices shown on the cited page.
OTOH, they have spawned a line of business with multiple volume-produced product-offerings to address a problem.
Such a problem must then actually exist, out there in the wild, even if - as said - "not always".
FWIW - Helwig or any other maker - brushes are not the only solution, either.