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Effects of Harmonics on Squirrel Cage Rotors

  • May 2023
  • Number of views: 1793
  • Article rating: 5.0

If you mention harmonics, engineers get excited while the eyes of non-engineers glaze over. The truth is that harmonics can be easily understood when explained in layman’s terms.

Efectos de los armónicos en los rotores de jaula de ardilla

  • May 2023
  • Number of views: 1278
  • Article rating: 5.0

Si mencionas la palabra armónicos, los ingenieros se emocionan mientras que los ojos de los que no lo son se nublan. La verdad es que los armónicos se pueden entender fácilmente cuando se explican en términos sencillos. 

Cool advice on hot motors

  • August 2015
  • Number of views: 11253
  • Article rating: No rating
Trade press article — Maintenance Technology

The effects of excessive temperature on motor performance are notorious. After moisture, they are the greatest contributor to bearing and winding failures. Understanding the source of increased temperature is key to correcting the problem and improving the reliability of your facility’s motor fleet.

Mitigating Harmonics and Detrimental Waveforms Caused by VFDs

  • June 2014
  • Number of views: 4386
  • Article rating: No rating
Convention presentation

This paper, originally presented at the 2014 EASA convention, deals with understanding IEEE Std 519 and various mitigation methods in order to meet those recommendations. It also reviews the types of filtering that is available to reduce the reflected waves, first turn insulation stress, and common mode voltages seen at the motor terminals.

Mitigating Harmonics and Detrimental Waveforms Caused by Active Front End and 6, 12, 18 Pulse Drives

  • July 2013
  • Number of views: 4188
  • Article rating: 1.7
Convention presentation

Whenever an application engineer is planning on installing adjustable speed drives for AC motors, line current harmonics and reflected waves are two factors that need to be addressed. This paper, presented at the 2013 EASA Convention, deals with understanding IEEE Std 519 and various mitigation methods in order to meet those recommendations. It also reviews the types of filtering that is available to reduce the reflected waves seen at the motor terminals.

Coil pitch and the search for the perfect sine wave

  • January 2004
  • Number of views: 3540
  • Article rating: No rating

This started as an article to explain those cases where a 2-pole winding concentric-to-lap conversion will not run. The cause has to do with the coil pitch selected and slot spatial harmonics. These harmonics have a harmful effect on motor performance. The key is avoiding certain coil pitches, and the "problem" 2-pole pitch depends on the number of slots and the coil pitch. To make the article more useful, it includes tables to identify "preferred" coil pitches for2-pole, 3-phase windings, as well as those that should be avoided.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

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.


ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This 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.



EASA Technical Manual

EASA Technical Manual cover

Revised September 2022
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.