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Articles in Industry Publications

Measuring a Bearing Journal

  • March 2023
  • Number of views: 3859
Video

This video explains how to measure the diameter of a bearing journal accurately to within five hundred-thousandths of an inch or one-thousandth of a millimeter.

Improve Customer Satisfaction: Follow Electric Motor Storage Procedures

  • January 2023
  • Number of views: 1850
Article

One of the more mundane things we as repairers must be concerned with is motor storage. For many of us, storing large motors for major customers is its own profit center. For all of us, being aware of how our customers store the motors we repair and send to them is critical to customer satisfaction. A poorly stored motor is likely to suffer winding or bearing failure, and we don’t want unrealistic warranty claims over something outside our control.

Mejore la Satisfacción del Cliente: Siga los Procedimientos de Almacenamiento de Motores Eléctricos

  • January 2023
  • Number of views: 4667
Article

Una de las cosas más mundanas de las que debemos preocuparnos como reparadores es el almacenamiento de los motores y para muchos, almacenar motores grandes para clientes importantes representa ganancias. Para todos nosotros, ser conscientes de cómo nuestros clientes almacenan los motores que les reparamos es crítico desde el punto de vista de la satisfacción del cliente. Es probable que un motor mal almacenado sufra fallos en el devanado o en los rodamientos, y no queremos reclamos por garantía poco realistas sobre algo que está fuera de nuestro control.

EASA Technical Manual

  • September 2022
  • Number of views: 26761
FREE for Members of EASA
Book

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.

Shaft Straightening Methods

  • September 2022
  • Number of views: 2056
FREE for Members of EASA
Webinar recording

There are heat methods and press methods for straightening shafts. This webinar reviews those methods, their pros and cons, and when one method or another may be applicable.

New ANSI/ASA Shaft Alignment Standard Adopted

  • May 2022
  • Number of views: 5968
Trade press article — Pumps & Systems

The procedure for aligning two rotating machines requires measuring their relative shaft positions and adjusting one or both machines. Until recently, though, how closely the shafts need to be aligned was an open question. That changed with the publication of American National Standards Institute/Acoustical Society of America (ANSI/ASA) standard 2.75-17.

Guía de Buenas Prácticas Para Conservar la Eficiencia del Motor

Basada en los Estudios de Rebobinado de motores de eficiencia premium, energético eficientes, IE2 (antigua EF1) e IE3 realizados en 2019 y en el 2003

  • April 2022
  • Number of views: 6519
Booklet
Dirigida principalmente al personal del centro de servicio, la guía, que ahora es un documento independiente y no forma parte del informe completo del estudio de rebobinado de EASA/AEMT, describe los métodos de reparación de buenas prácticas utilizados para lograr los resultados proporcionados en ambos estudios. Contiene consejos de reparación, terminología relevante del motor e información sobre fuentes de pérdidas en motores de inducción que afectan la eficiencia.

Fundamentos de Reparación Mecánica de Motores Eléctricos

  • March 2022
  • Number of views: 14632
Book

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.

Mechanical Reference Handbook

  • June 2021
  • Number of views: 4863
Handbook

This 94-page handbook (3.5" x 6", 9cm x 15cm) contains carefully selected materials designed to assist repair firms in their everyday work. Just as important, your customers and potential customers can use this pocket handbook as a handy reference for mechanical data for motors and driven equipment.

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

  • January 2021
  • Number of views: 17787
Booklet

Intended primarily for service center personnel, the guide which is now an independent document and not part of the complete EASA/AEMT rewind study report, outlines the good practice repair methods used to achieve the results given in both studies. It contains repair tips, relevant motor terminology, and information about sources of losses in induction motors that affect efficiency.

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Vibration and Alignment

  • April 2020
  • Number of views: 13175
Webinar recording bundle

A special discounted collection of 9 webinar recordings focusing on a wide variety of vibration, balancing and alignment topics.

Just $45 for EASA members!

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Shaft and Bearing Currents

  • March 2020
  • Number of views: 14574
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: 53255
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.

Root Cause Failure Analysis, 2nd Edition

  • September 2019
  • Number of views: 30710
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.

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

  • February 2019
  • Number of views: 15374
Book

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.).

Vertical Turbine Pump Shaft & Bearing Types, Fits and Clearance

  • November 2018
  • Number of views: 11005
Webinar recording

This presentation covers:

  • Shaft material and specs
  • Shaft coupling types
  • Machining for shafts
  • Bronze, plastic, graphite and cutlass bearing options
  • Bearing clearance concerns and reference data 
  • Bearing housing fits
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Converting motors from horizontal to vertical mount

  • September 2018
  • Number of views: 14382
Article

Occasionally an end user wants to take a motor designed for horizontal mounting and use it in a vertical position. In this article, we will address some of the key mechanical factors that should be considered when applying a horizontal ball bearing motor in a vertical mounting position.

Convirtiendo motores de montaje horizontal a vertical

  • September 2018
  • Number of views: 11216
Article

De vez en cuando un usuario final quiere utilizar un motor diseñado para montaje horizontal en posición vertical. En este artículo, trataremos algunos factores mecánicos clave que deben ser considerados cuando se utiliza un motor horizontal con rodamientos de bolas en una aplicación en la que trabaja en montaje vertical. La Figura 1 ilustra un motor horizontal en posición vertical con el eje hacia abajo.

Los factores clave incluyen:

  • Capacidad de carga axial del rodamiento que soporta el peso del rotor.
  • Peso del rotor
  • Peso de los elementos acoplados al eje de salida
  • Empuje axial de los equipos de impulsión acoplados directamente
  • Trayectorias de lubricación de los rodamientos
  • Retención del lubricante de los rodamientos
  • Orientación del eje: Hacia abajo o hacia arriba
  • Protección contra ingreso
  • Fijación axial del rodamiento de empuje

Electrical Engineering Pocket Handbook

  • August 2018
  • Number of views: 12893
Handbook

Filled with practical information, this 118-page handbook (3.5" x 6", 9cm x 15cm) makes a great “give-away” item for your customers and potential customers! Buy this great resource as is OR imprint your company logo and information on the cover to turn it into a great marketing piece for your salespeople!

ANSI's New Shaft Alignment Standard

  • July 2018
  • Number of views: 6664
Webinar recording

This presentation introduces you to ANSI's new shaft alignment standard.

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Two case history examples point to need for caution with metal spray

  • June 2018
  • Number of views: 7226
Article

Two case histories point out the need for caution when working with metal sprayed shafts:

  • Example 1: When measuring the bearing fit shaft size, the micrometer didn’t feel right; mushy, not solid, although the journal was very close to the specified size. After using two micrometers to experiment with one of these frosted fits, it was discovered that the measurement on one micrometer changed when tightening down the other micrometer and vice versa.
  • Example 2: The bearing journals on a large armature began to fail while the armature was coming up to speed in balance stand.

Dos ejemplos de casos que indican la necesidad de tener cuidado con el metalizado

  • June 2018
  • Number of views: 2353
Article

En mi centro de servicio hemos visto problemas en ejes previamente reparados que fueron metalizados. En estos casos recibimos motores para revisión. Después de la inspección y de medir los ajustes de los rodamientos en el eje, encontramos algo que simplemente no se “sentía” bien. Podríamos decir por la apariencia que los ejes habían sido reparados antes de la revisión actual.

Vertical Turbine Pump Shaft Journal Bearing Material, Types and Clearances

  • December 2017
  • Number of views: 4333
Webinar recording

The rules of thumb often applied to journal bearings in horizontal machines don’t apply to vertical machines. Vertical turbine pumps are a common example.

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Making vertical turbine pump shaft adjustments

  • December 2015
  • Number of views: 5541
Article

It is common for vertical turbine pumps (VTP) to be designed with multiple mixed flow impellers (sometimes 12 or more) and for the pump rotor to be supported by the vertical pump motor. Vertical pump motors can be solid shaft or hollow shaft. In either case, there is an adjustment that lifts the pump rotor so it is supported by the motor shaft. This adjustment is obviously critical to the proper operation of the pump and motor and can have a significant effect on the motor load (current). Presented here are some of the main concerns for setting this pump lift adjustment.

Realizando los ajustes en la elevación del eje de una bomba de turbina vertical

  • December 2015
  • Number of views: 6198
Article

Es común que las bombas de turbina vertical (VTP) se encuentren diseñadas con varios impulsores de flujo mixto (algunas veces 12 o más) y que los rotores de las bombas estén soportados por los motores verticales. Los motores de las bombas verticales pueden ser de eje macizo o hueco. Los motores de eje macizo tienen una cuña o chaveta anular (en forma de anillo) en el eje, para asegurar un acoplamiento sólido que soporta el rotor de la bomba. Los motores de eje hueco soportan y accionan el rotor de la bomba desde la parte superior, mediante un cabezal de eje que está asegurado al eje lineal intermedio (line shaft) a través del eje hueco del motor. En cualquiera de los casos, existe un ajuste que eleva el rotor de la bomba para que quede soportado por el eje del motor. Obviamente este ajuste es crítico para el funcionamiento adecuado de la bomba y el motor y puede llegar a tener un efecto significativo en la carga del motor (consumo de corriente en amperios). En este artículo se presentan algunos puntos importantes para ajustar la elevación del eje de la bomba. 

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

  • August 2015
  • Number of views: 13778
Book

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.

V-belt drives: Common problems and their solutions

  • June 2015
  • Number of views: 12332
Article

Two common scenarios that service centers deal with regarding belt drive applications are failure of a motor drive end ball bearing or breakage of the shaft at the drive end bearing shoulder. The cause of these failures often is over-tensioning of the v-belts. However, there are many other faults or undesirable practices that can lead to premature bearing failure, belt wear and sheave wear.  Due to practical space limitations, this article isn't exhaustive in its coverage but deals with common scenarios other than motor bearing failure and shaft breakage.

Identifying and getting to root cause of shaft currents

  • February 2015
  • Number of views: 4744
Article

Shaft currents have always been a concern for large motors due to magnetic asymmetries within the motor. Manufacturers strive to keep these to a minimum.  With the widespread use of Variable Frequency Drives (VFDs), shaft current issues have become a concern in all sizes of motors. If these currents are discharged through the bearings, electrical discharge machining (EDM) occurs. Proper installation of VFDs can play a large part in mitigating issues with shaft currents. 

External mechanical tolerances for electric motors and generators

  • August 2014
  • Number of views: 6561
Article

Service centers routinely check the shaft extension runout of motors and generators. When there are issues associated with them, or when applicable, the coplanarity of the mounting feet and the amount of end foat of horizontal sleeve bearing motors and generators are checked.

Failure Analysis of Shafts and Fasteners

  • June 2014
  • Number of views: 6600
Convention presentation

This technical paper, presented at the 2014 EASA Convention, will help you understand how and why shafts and fasteners fail.