Facebook Twitter LinkedIn YouTube Menu Search Arrow Right Arrow Left Arrow Down Arrow Up Home Arrow Next Arrow Previous RSS Icon Calendar Icon Warning Icon
NOTICE: Portions of the EASA website will be offline for a software upgrade from 7:30 - 10:30 am CDT on Thursday, Oct. 21.

Filter the results

  • Enter one or more words to find resources containing any of the words entered
  • Enter words or phrases between " " to find exact match

Resource categories

Resource Library

Controlling Stator Copper Losses in Formed Coil Rewinds

  • May 2020
  • Number of views: 4290
  • Article rating: No rating
FREE for Members of EASA
Webinar recording

This webinar recording looks at several aspects of winding design to prevent increased temperature rise and decreased efficiency.

Insulation Technology Improvements and the Repair Market

  • July 2019
  • Number of views: 1382
  • Article rating: No rating
Webinar recording

Most modern rotating electric machines operate on the same principles their predecessors have for 100+ years. However, improvements in materials technology over that time have allowed for increasingly greater power density in machine design.

Getting to know fractional-slot concentrated windings (FSCW)

  • March 2019
  • Number of views: 2629
  • Article rating: No rating

Fractional-slot concentrated windings (FSCW) have been used for decades, primarily in small machines. But continued technological advancement in power electronics along with the need for more efficient and power-dense machines is increasing use of FSCW in a variety of machine types and sizes.

Magnetic Wedges

  • February 2019
  • Number of views: 2402
  • Article rating: 5.0
Webinar recording

An increasing number of manufacturers are using magnetic wedges in their form-wound machines. When a winder fails to replace magnetic wedges in kind, the winding temperature rise can increase by 20°C, and the magnetizing current can increase by 20% or more.

AC Motor Verification and Redesign and Motor Rewind Data Version 4 programs work together to offer more capabilities

  • February 2019
  • Number of views: 2782
  • Article rating: No rating

The Version 4 software is a powerful set of tools for members to check the validity of winding data and to redesign windings from concentric-to-lap and for changes in motor performance. A key feature of this latest version of the program is the integration of the MotorDB with the ACRewind program. The availability of both program functions within a common user interface provides more than just convenience. The ability of the programs to share data resources creates new capabilities that the stand-alone version of the program could not.

Parallel circuits: More than meets the eye

  • December 2018
  • Number of views: 2421
  • Article rating: No rating

There are benefits and drawbacks to the use of multiple circuits in a 3-phase winding. Whether discussing a random winding or form coil winding, some of the considerations are shared. Topics covered include:

  • Increasing circuits, turns
  • Rotor pullover during starting
  • Increased risks
  • Factors beyond our control

DC motor applications: Types of fields and benefits of each

  • April 2018
  • Number of views: 1717
  • Article rating: 5.0

For the wide variety of DC motor applications, there are those where a straight shunt motor is preferred and others which seem to require the greater starting torque of a series field. Why are there different field designs and are they interchangeable? What about the nameplates marked “stab shunt” or “str shunt?” The purpose of this article is to clear up lingering confusion about the types of fields as well as the benefits of each.

Aplicaciones de motores de CC: Tipos de campos y beneficios de cada uno

  • April 2018
  • Number of views: 1263
  • Article rating: No rating

Para la amplia variedad de aplicaciones de motores de CC, existen aquellas en las que se prefiere un motor shunt directo (straight shunt) y otras que parece que necesitan el mayor torque de arranque de un campo serie. ¿Por qué existen diferentes diseños de campo y son intercambiables? ¿Qué sucede con las placas de datos marcadas como “stab shunt” o “str shunt?” El propósito de este artículo es aclarar la confusión permanente sobre los tipos de campos, como también los beneficios de cada uno.

End turn and connection spacing in large motors and generators

  • September 2015
  • Number of views: 2082
  • Article rating: No rating

This article looks at an issue encountered with new air-cooled machines rated at 13.8 kV that generated large quantities of ozone and had very high partial discharge levels. The basic problem with the windings in these machines was incorrect spacing of the end turns and the main leads. There was also a lack of space between the series and group connections in the windings. 

Distancias de las conexiones y las cabezas de bobinas en grandes motores y generadores

  • September 2015
  • Number of views: 1659
  • Article rating: No rating

Recientemente trabajé en una máquina nueva de 13.8 kV de tensión nominal, enfriada por aire,   que pro-ducía grandes cantidades de ozono y tenía grandes niveles de descargas parciales. El problema básico con  los bobinados de esta máquina era  el espacio incorrecto entre las cabezas de bobina y los cables  de salida prin-cipales. También había poco espacio entre las series y las conexiones entre los  grupos del bobinado.

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 May 2021
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.