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Avoiding Pitfalls in Three-phase Windings with Unequal (Odd) Grouping

  • February 2023
  • Number of views: 1069
  • Article rating: 5.0

This article uses examples to illustrate some of the pitfalls and subtle aspects regarding windings with unequal coil grouping.

Evitando Errores en Devanados Trifásicos con Grupos Desiguales

  • February 2023
  • Number of views: 786
  • Article rating: No rating
Este artículo usa ejemplos para ilustrar algunas de las trampas y aspectos sutiles con respecto a los devanados con agrupamiento desigual de bobinas.

Consider Winding Balance with Redesigns and Rewinds

  • December 2022
  • Number of views: 2287
  • Article rating: No rating

Most AC stator windings installed by EASA service centers are balanced, three-phase, two-layer, lap windings. But, what does it mean for such a winding to be balanced?

Using EASA Internal Connection Diagrams

  • May 2022
  • Number of views: 3242
  • Article rating: 3.8
FREE for Members of EASA
Webinar recording

EASA Internal Connection Diagrams for Three-Phase Electric Motors is available to members as a free PDF download and contains hundreds of connections, as well as templates for windings up to 30 poles. This webinar recording shows how to access it and provide examples of how to use it.

Concentric, Lap or Full Slot Lap: When Is a Shortcut Not a Shortcut?

  • March 2022
  • Number of views: 4842
  • Article rating: 5.0

While manufacturers use concentric windings due to their ability to wind the coils directly into a core, many repairers convert them to lap windings to take advantage of the superior MMF (magneto-motive force) curve. Although the former Tech Note 12 (see page 2-187 of the EASA Technical Manual), and the AC Motor Verification and Redesign Program, Version 4 allow us to convert a concentric winding to a comparable lap winding, there are still some winders using “shortcuts” they have learned over the years.

Concentrico, Excéntrico o Excéntrico a Ranura Llena: ¿Cuándo Un Atajo No Lo Es?

  • March 2022
  • Number of views: 3833
  • Article rating: No rating

Mientras los fabricantes usan devanados concéntricos por su capacidad para bobinarlos directamente dentro del núcleo, muchos reparadores los convierten en bobinados excéntricos para aprovechar su curva FMM (fuerza magnetomotriz) superior.

Cambios en el Bobinado: Como Afectan el Desempeño del Motor

  • June 2021
  • Number of views: 8895
  • Article rating: No rating
FREE for Members of EASA
Webinar recording

En este webinario explicaremos como los diferentes cambios efectuados en el bobinado impactan en el desempeño del motor. Si no es realizado de forma correcta, cualquier cambio en el bobinado podría llegar a tener consecuencias negativas.

Best AC Rewind Practices

  • February 2021
  • Number of views: 13338
  • Article rating: 4.0
FREE for Members of EASA
Webinar recording

This webinar recording shares some of the “best practice” rewind methods used by (and learned from) EASA service centers around the world: connection recognition, best insulating materials, wire choices and tips to save time and effort.

Circulating Currents in AC Stator Windings

  • August 2020
  • Number of views: 6653
  • Article rating: 5.0
FREE for Members of EASA
Webinar recording

This webinar recording discusses the equalized connections found in an increasing number of factory windings, explains why they are used, and addresses whether or not they are needed when converting a concentric winding to a lap winding. Alternatives, such as changing the number of circuits, or the special extra-long jumpers, are also compared.

Working with AC Windings

  • April 2020
  • Number of views: 10355
  • Article rating: 4.0
Webinar recording bundle

A special discounted collection of 12 webinar recordings focusing on AC motor windings.

Just $60 for EASA members!

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.