U.S. MOTORS with AEGIS
110+ Years of Innovation
The United States Electrical Manufacturing Company began making electric...
Changing Standards: Shaft Grounding in IEEE-841 Motors & Hazardous Locations
Shaft grounding for VFD-fed electric motors has largely been disallowed in "Classified"...
Electrical Bearing Protection Q&A - Part 25
Q1. Are there any municipal/metro railways that use shaft grounding rings on their electric trains?
VFD Switching Frequency & Bearing Current
At almost every Q&A session we hold, the question comes up: "Does VFD switching frequency affect...
Electrical Bearing Protection Q&A - Part 24
Q1. Everyone agrees that the VFD is the cause of the common mode voltage that causes capacitive...
Circulating Motor Bearing Current
In this blog, we mainly talk about capacitive shaft voltage discharge. This is a problem in all...
Electrical Bearing Protection Q&A - Part 23
Q1. How you install grounding in concrete? I have a pump being retrofit with a new VFD.
Inductive Absorbers Cannot Substitute for Shaft Grounding
We got an email recently from an engineering consultant. He had recently specified a project...
Electrical Bearing Protection Q&A – Part 22
Q1. What are the pros and cons of shaft grounding rings compared with shaft grounding brushes?