EASA's DC Machine Data Sheet provides all the fields necessary on a simple one-page form to accurately record all the details about the machine being repaired.
Webinar recording bundle
A special discounted collection of 6 webinar recordings focusing on DC motor electrical procedures.
Just $30 for EASA members!
A convenient incoming inspection report for basic DC motor conditions and test values.
This inspection report helps record a DC motor's connection as it enters the service center. It is intended for use with 2-, 4- and 6-pole DC machines.
The Institute of Electrical and Electronics Engineers (IEEE) standard for insulation resistance testing of motor and generator windings that was published in 2002 has been revised. The 2013 edition was published in March 2014. This article examines the changes to the standard.
We know that excessive temperature and moisture are the largest contributors to bearing and winding failures. Understanding the source of the increased temperature will help us to correct the problem and improve the machine’s life expectancy.
A conversation with two EASA members led to a method for determining whether the interpoles are connected with the correct number of circuits. Not only is this method easy, it's a refinement of the interpole polarity test we routinely perform on every repaired DC machine.
Have you ever wondered about the purpose of the shims found under the interpoles in most DC machines? Those shims are used by the manufacturer to adjust the interpole strength. If they are lost, left out or mixed up, the result will be a DC motor or generator that arcs - especially when loaded.
Covers all necessary steps for layer-winding DC field coils, how to layer-wind a shunt field coil, how to reinsulate an interpole field coil, and how to install large field coils in the frame.