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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

Principles of Medium & Large AC Motors, 1st Edition - IEC

  • February 2020
  • Number of views: 56591
  • Article rating: 4.3

This manual covers horizontal and vertical squirrel-cage induction motors in the 300 to 5,000 horsepower range, low- and medium-voltage. Most of the principles covered apply to other sizes as well. This manual focuses primarily on IEC motors and standards.

EASA Technical Manual

  • September 2022
  • Number of views: 29087
  • Article rating: .6
FREE for Members of EASA

Revised September 2022!
EASA's most comprehensive technical document is available FREE to EASA members. Download the complete manual or just the sections you're interested in.

How to properly operate a three-phase motor using single-phase power

  • October 2016
  • Number of views: 18825
  • Article rating: 3.6

There are several methods to operating a three-phase motor using single-phase power to make what would be an otherwise expensive and arduous process a little easier.

Principios de Motores C.A. Medianos y Grandes - NEMA

  • February 2019
  • Number of views: 16673
  • Article rating: 4.5

Las versiones impresas y en forma de descarga del valioso manual didáctico / recurso de EASA, “Principios de Motores C.A. Medianos y Grandes”, se  ahora disponibles en inglés y en español. El manual incluye gráficos e ilustraciones, fotografías y mucha información técnica sobre máquinas C.A., incluyendo como funcionan, información específica sobre los tipos de encerramientos, fabricación de componentes y aplicaciones.  Muchos de los principios incluidos en el libro aplican a todos los motores C.A., especialmente a aquellos accesorios que fueron asociados en el pasado con las máquinas más grandes (como encoders, RTDs, termostatos, calentadores de espacio, sensores de vibración, etc.).

Principles of Medium & Large AC Motors, 2nd Edition - NEMA

  • August 2015
  • Number of views: 16637
  • Article rating: 4.3

This manual, a companion to EASA's 2-day seminar of the same name, covers horizontal and vertical squirrel-cage induction motors in the 300 to 5,000 horsepower range, low- and medium-voltage. Most of the principles covered apply to other sizes as well. This manual focuses primarily on NEMA motors.

Shaft and Bearing Currents

  • March 2020
  • Number of views: 16196
  • Article rating: 5.0
FREE for Members of EASA

This webinar explains what shaft currents are, what causes them, and differentiate between the two common causes. It also discusses and compares methods to mitigate shaft currents and explains why the different causes of shaft currents require different solutions.

Use of variable frequency drives with wound rotor motors

  • October 2004
  • Number of views: 14413
  • Article rating: 3.8

The slip ring or wound rotor induction motor (WRIM) has been used in a variety of applications. Many of these applications use the WRIM's high starting torque capability while limiting current to start and run very high inertia loads such as hammer mills, rolling mills, centrifuges, and rotary kilns. Other applications utilize the variable speed capability of the WRIM. Probably the most common use of WRIMs for variable speed is in crane and hoist service. Other variable speed uses for the WRIM include wiredraw machines, fans, blowers, pumps and refrigeration compressors. Many of these applications, if designed today, would utilize a standard induction motor and variable frequency drive (VFD), particularly those where speed control is the desired end result. When older WRIMs or their controllers fail, the best solution often is to replace both motor and control. There are situations, however, where the best solution may be to replace the old controller with a VFD and continue to use the WRIM. As always, the more knowledge we have about the equipment we work on the better equipped we are to make good choices about repairing, replacing or upgrading this equipment for our customers. With this in mind, a review of how the WRIM and some of its control schemes work seems appropriate.

Inverter Duty Motor Rewinding

  • April 2021
  • Number of views: 14086
  • Article rating: 1.7
FREE for Members of EASA

This webinar recording reviews the failures associated with 3-phase motors on Variable Frequency Drives (VFDs) and how to rewind to limit future failures.

Considerations for using VFDs with standard motors

  • December 2016
  • Number of views: 11564
  • Article rating: No rating

There are a few areas of concern involving the misapplication variable frequency drives (VFDs) on a standard induction motor. This article looks at some of those.

Rewind 2021

Recordings and Handouts from the 2021 EASA Convention - Fort Worth, TX

  • June 2021
  • Number of views: 11297
  • Article rating: 5.0

Revisit EASA's 2021 Convention & Solutions Expo by buying access to recordings of the general sessions and education events streamed from EASA's website! These recordings provide just over 22 hours of training. Downloadable PDFs of slides and technical papers are included!

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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