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ANSI/EASA AR100-2020 cover

ANSI/EASA Standard AR100-2020
ANSI/EASA AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus is a must-have guide to the repair of rotating electrical machines. It establishes recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

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Questions?

For information about ANSI/EASA AR100 or questions about the work on this standard, contact:

Mike Howell, PE
EASA Technical Support Specialist
+1 314 993 2220
mhowell@easa.com

ANSI Accredited Standards Developer Information

Testing Interpole Polarity on a DC Machine

  • January 2025
  • Number of views: 2217
  • Article rating: No rating

This video will walk you through how to check the relative polarity of DC machine interpoles and the armature and correct it if necessary using a simple interpole polarity test.

It's important to perform this test after any DC machine repairs or routine maintenance activities where the brush lead to the brush holders might accidentally be switched. If undetected, this will cause severe brush sparking or even flashover as the motor is loaded.

Some topics covered include:

  • How to verify whether or not the intpole polarity is correct
  • How to diagnose and remedy Interpol polarity problems, including misconnected or incorrectly sequenced inner poles
  • How to check for too many or too few interpol circuits

The video also has bonus tips about equalizing jumpers.



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EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

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EASA Good Practice Guide

Good Practice Guide to Maintain Motor Efficiency
Based on the 2019 and 2003 Rewind Studies of premium efficiency, energy efficient, IE2 (formerly EF1) and IE3 motors

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