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Resource Library

Controlling Stator Copper Losses in Formed Coil Rewinds

  • May 2020
  • Number of views: 4289
  • 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.

Motor bearings: Electrical damage simplified

  • December 2017
  • Number of views: 2494
  • Article rating: 5.0

Electrical bearing damage has become a very common issue in electric motors. This is not a new problem, but awareness has put the spotlight on this important reliability factor and industry has stepped up to deal with it.

Electrical machine enclosures: Degree of protection (IP) codes

  • December 2017
  • Number of views: 3998
  • Article rating: 4.0

The International Electrotechnical Commission (IEC) standard 60529 “Degrees of protection provided by enclosures (IP code)” addresses the degrees of protection for electrical machines (motors and generators). The “IP” acronym means “International Protection,” but is sometimes referred to as “Ingress Protection.” The IP code is commonly displayed on metric machine nameplates, which are manufactured to IEC standards.

The NEMA MG1 Motors and Generators standards have adopted the IEC standards for the IP designations. Although not prevalent on NEMA machine nameplates, the inclusion of the IP marking is becoming more common. The purpose of this article is to describe the IP code designations and provide examples of the IP codes for common electrical machine enclosures.

Encerramientos de las máquinas eléctricas: Grados de protección (Códigos IP)

  • December 2017
  • Number of views: 4038
  • Article rating: No rating

La norma 60529 de la International Electrotechnical Commission (IEC): “Degrees of protection provided by enclosures (IP code)” trata los grados de protección de las máquinas eléctricas (motores y generadores). La sigla “IP” significa “Protección Internacional” pero a veces se le conoce como “Protección contra Ingreso”. El código IP se muestra comúnmente en las placas de datos de las máquinas métricas, que son fabricadas con normas IEC. 

Las normas NEMA MG1 Motors and Generators han adoptado las normas IEC para las designaciones IP. Aunque no prevalecen en las placas de datos de las máquinas NEMA, la inclusión del marcado IP se está volviendo más común. El propósito de este artículo es describir las designaciones IP y proporcionar ejemplos de los códigos IP para los encerramientos de las máquinas eléctricas más comunes.

Air gap — What is it and why is it important?

  • November 2017
  • Number of views: 1680
  • Article rating: No rating

Air gap is the physical gap between a rotor and stator core in an AC machine, or between the armature and fields / interpoles in a DC machine. The role of the air gap is not as simple as it appears.

Topics discussed in this article include:

  • Important principles (magnetic force and the amount of current to drive flux through air)
  • Air gap in AC machines
  • Air gap in DC machines

Consideraciones sobre la fuente de alimentación al construir un gran growler

  • July 2017
  • Number of views: 1783
  • Article rating: No rating

Cuando se considera la construcción de un gran growler para probar rotores y armaduras, la decisión inicial típica es seleccionar la potencia en kVA. La razón principal para esto es que el growler necesitará ser conectado a una fuente de alimentación que tenga suficiente amperaje. Para ayudar a simplificar el complejo proceso de diseño, en este artículo hemos seleccionado cinco potencias expresadas en kVA.

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.