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Resource Library

Fitting Sleeve Bearings

  • August 2020
  • Number of views: 372
  • Article rating: No rating
Article

When sleeve bearings are rebabbitted or replaced, an important step during assembly is to check the contact between the sleeve bearing and the journal which rides in it. The use of self-aligning sleeve bearings (also called spherical or ball fit) renders this step almost unnecessary. Still, cylindrical sleeve bearings should be inspected to make sure the contact area is sufficient. This article is specific to checking and correcting the wear pattern when installing a new sleeve bearing in an electric motor.

Ajuste de Los Cojinetes de Deslizamiento

  • August 2020
  • Number of views: 339
  • Article rating: No rating
Article

Cuando se rebabitan o se reemplazan cojinetes de deslizamiento, un paso importante durante el montaje consiste en verificar el contacto entre el cojinete y el muñón del eje que monta sobre el. El uso de cojinetes de deslizamiento auto alineables (también denominados esféricos o de ajuste esférico) hace que este paso sea casi innecesario. Aun así, los cojinetes de deslizamiento cilíndricos se deben inspeccionar para verificar que haya suficiente área de contacto. Este es un artículo específico para verificar y corregir el patrón de desgaste al momento de instalar cojinetes nuevos en un motor eléctrico.

Vertical Motor Operation and Repair

  • June 2020
  • Number of views: 385
  • Article rating: No rating
FREE for Members of EASA
Convention presentation

Vertical motors differ from horizontal motors in numerous ways, yet some view them as “just a horizontal motor turned on end.” The obvious differences are the (usually) thrust bearings, with arrangements varying from single- to three-thrust bearings with different orientations suited for specific load, rpm and applications. Less obvious differences are in the ventilation arrangements, shaft stiffness, degrees of protection and runout tolerances. This recording will cover those topics.

Shaft and Bearing Currents

  • March 2020
  • Number of views: 2216
  • Article rating: 5.0
FREE for Members of EASA
Webinar recording

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.

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

  • February 2020
  • Number of views: 2040
  • Article rating: 5.0
Book

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.

Como ocurre el empuje hacia arriba en las bombas de turbina verticales y disposiciones para controlarlo

  • October 2019
  • Number of views: 899
  • Article rating: No rating
Article

Las bombas de turbina verticales (VTP) son accionadas por motores verticales provistos con grandes rodamientos de empuje que soportan el peso del rotor del motor, el rotor de la bomba y el empuje dinámico hacia abajo, producido por los impulsores cuando levantan el líquido. El peso del rotor del motor y del rotor de la bomba se determinan fácilmente a partir de datos de ingeniería simples. El cálculo del empuje producido por los impulsores cuando interactúan con el líquido en movimiento es mucho más difícil y no siempre el empuje es generado hacia abajo.

En este artículo revisemos brevemente cómo se produce el empuje hacia arriba en las bombas y las disposiciones en los motores VTP diseñados para controlarlo.

How up-thrust occurs and provisions to control it in vertical turbine pumps

  • October 2019
  • Number of views: 824
  • Article rating: No rating
Article

Vertical turbine pumps (VTP) are driven by vertical motors with large thrust bearings that support the weight of the motor rotor, the pump rotor and the dynamic down-thrust generated by the pump impellers as they lift the liquid. The weight of the motor rotor and pump rotor are easily determined from simple engineering data. The amount of thrust generated by the impellers as they interact with the moving liquid is much more complicated, and the thrust is not always generated in the downward direction. This article looks at how up-thrust occurs and the provisions to control it.

Root Cause Failure Analysis, 2nd Edition

  • September 2019
  • Number of views: 3668
  • Article rating: 5.0
Book

This book was developed to help electric motor technicians and engineers prevent repeated failures because the root cause of failure was never determined. By using a proven methodology combined with extensive lists of known causes of failures, one can identify the actual cause of failure without being an “industry expert.” In fact, when properly used, this material will polish one’s diagnostic skills that would qualify one as an industry expert.

Limiting end float of a sleeve bearing machine

  • April 2019
  • Number of views: 942
  • Article rating: No rating
Article

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.

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

  • February 2019
  • Number of views: 1029
  • Article rating: No rating
Book

Las versiones impresas, en CD-ROM 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.).

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides a great marketing tool for your service center! Use it to provide end users with information that will help them obtain 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

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EASA Technical Manual

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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.

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ANSI/EASA AR100-2020

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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.

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EASA AR200

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Guide for the Repair of Power and Distribution Transformers
This document establishes guidelines for each step of the repair of power transformers, describing record keeping, tests, analysis, and general guidelines for the repair of power transformers.

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