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Eddy-Current Coupling and Brake Repair

  • August 2022
  • Number of views: 92
  • Article rating: No rating

Eddy-current couplings (coupling/clutch/brake), while slowly being replaced by variable-frequency drive (VFD) technology, are still in use and will require repairs. As these devices become less common, the expertise pool is also shrinking. On the positive side, their specialized nature ensures that those familiar with these units will be in demand for some time.

Reparación de Embragues y Frenos de Corrientes Parásitas

  • August 2022
  • Number of views: 87
  • Article rating: No rating

Los embragues de corrientes parásitas (acoplamiento/embrague/freno/clutch), aunque poco a poco están siendo reemplazados por la tecnología con variadores de frecuencia electrónicos (VFD) siguen en uso y requieren reparaciones. A medida que estos dispositivos se vuelven más raros, el grupo de expertos en ellos también se reduce, pero el lado positivo es que su naturaleza especializada asegura que quienes estén familiarizados con este tipo de equipos serán demandados durante algún tiempo.

Fundamentos de Reparación Mecánica de Motores Eléctricos

  • March 2022
  • Number of views: 9248
  • Article rating: 3.0

En toda reparación mecánica, la capacidad para desmontar, reparar y volver a montar el motor de forma apropiada sin dañar innecesariamente ninguna de sus piezas es fundamental.

Esta obra contiene muchas sugerencias sobre el manejo apropiado de las diferentes partes de un motor para minimizar los daños durante el proceso de reparación. Sin embargo, es imposible desarrollar un listado que las incluya todas.

En cambio, el principio básico de tomarse el tiempo para usar la herramienta adecuada y por lo general el procedimiento apropiado guiará a los técnicos por el camino correcto.

Eddy-Current Clutches and Fluid Couplings

  • November 2020
  • Number of views: 4829
  • Article rating: No rating
FREE for Members of EASA
Webinar recording

This webinar recording explains how each of these devices work, with repair tips and application information for each.

Limiting end float of a sleeve bearing machine

  • April 2019
  • Number of views: 6949
  • Article rating: No rating

There are applications where the end float inherent to a sleeve bearing machine is not desirable, and some means of limiting the axial movement is needed. This is usually accomplished by selecting an appropriate coupling and relying on the driven equipment to prevent axial movement of the motor shaft. 

The gear-hub style of coupling can be end-float limited by installing a “hockey-puck” spacer. The grid-style coupling can be limited by spacers inserted on both sides. 

Regardless of coupling style, unless the driven equipment has some internal means to limit end float, there are circumstances where some external means of preventing axial movement is needed.

Achieving proper alignment by detecting and correcting soft foot

  • May 2016
  • Number of views: 8316
  • Article rating: 5.0

Proper alignment of direct-coupled machinery is an essential element in reliability of a new or repaired machine (motor, pump, gear case, etc.). One common impediment to achieving proper alignment and smooth operation is a “soft foot” condition. This article looks at detecting soft foot, correcting soft foot and general recommendations for shims.

Logrando una alineación adecuada detectando y corrigiendo el pie suave

  • May 2016
  • Number of views: 9100
  • Article rating: No rating

Realizar una correcta alineación de las máquinas acopladas de forma directa es un elemento esencial para garantizar la confiabilidad de operación de una máquina nueva o reparada (motor, bomba, caja de engranajes, etc.). Uno de los impedimentos comunes para lograr una alineación adecuada y un correcto funcionamiento, es el denominado  "pie suave".

Fundamentals of Shaft Alignment

  • November 2012
  • Number of views: 4397
  • Article rating: 3.0
Webinar recording

This presentation explains the simple calculations that govern the alignment process.

Clearance and interference coupling fits: Tips on when to use and how to determine tolerances

  • July 2009
  • Number of views: 5533
  • Article rating: 4.0

Couplings for connecting shafts can be placed in two categories: keyed and keyless. Similarly, the fits of couplings to shafts can be categorized as clearance or interference. A keyless coupling arrangement will always have an interference fit, while a keyed arrangement may have either a clearance or an interference fit. This article will focus on determining when to use a clearance or an interference fit, and how to obtain the tolerances for the resulting fit.

Pitfalls of applying generally accepted coupling manufacturers' alignment tolerances

  • February 2005
  • Number of views: 4828
  • Article rating: No rating

Shaft couplings are devices that connect two rotating shafts together. They efficiently transfer motion and power from the drive unit to the driven unit without adversely impacting either piece of rotating equipment. Under ideal conditions, both shafts should function as a continuous unit. The design of a flexible coupling is to accommodate small amounts of shaft misalignment. Coupling manufacturers have designed their couplings to withstand the forces resulting from excessive shaft misalignment. Unfortunately, shaft alignment tolerances have sometimes been governed by the coupling manufacturers' design specifications.

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.