ANSI/EASA AR100 is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

Many service centers are unable to perform full-load testing of large DC machines. The good news is that there are specific tests that can be performed on a DC motor to verify the integrity of windings, the correct relative polarity of armature to interpoles, and proper running performance. This article explains specific tests that can help ensure a motor operates properly when the motor is installed. 

Does your electric motor service center have prescribed standard operating procedures? When we hire a new team member, we load them up with policy, safety and procedural manuals, often including resources like ANSI/ EASA Standard AR100-2020. Yet, many service center owners and managers have a disconnect when it comes to formal skill development programs.

The purpose of this article is to explain the basis and application of rules used to “estimate” fan performance for a fan installed in a duct system moving air when the speed of the fan is changed.

This presentation covers the important details for a properly converting a 3 phase winding from concentric to lap.

Identifying unmarked leads in three-phase motors is a common task for service center technicians. This article provides one way to assign lead numbers for a 12-lead machine with unmarked leads.

Have you ever been out at a restaurant or sports bar to meet up with some friends and colleagues to have an adult beverage or two when suddenly someone leans on the table ever so slightly and liquid spills everywhere? What just happened? The small space between the table leg and the floor has just created a big consequence. While it’s not too difficult to solve if you have some napkins and a few coasters, it does, however, illustrate the results of a soft foot and how a very small space can lead to a much larger consequence.

No matter where you operate in the world, the most common response to challenges seems to be drafting a new standard, guideline or regulatory framework. The outcome is often a quality system that grows into mountains of documents, procedures and processes—each one intended to ensure quality, but collectively threatening to overwhelm both workshops and engineers.

In the world of rotating machinery, terms like balance, clearance and alignment are second nature to engineers and technicians. But one concept often hides in plain sight—critical to performance, longevity and safety—magnetic center alignment.

This presentation focuses on the proper clearances, materials and installation process for centrifugal pump wear rings.