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Articles in Industry Publications

Optimizing Asset Performance: The Critical Role of Electrical Signature Analysis in Asset Health Assessment for Electric Motor Systems

  • October 2024
  • Number of views: 115
Article

Pumps, compressors, fans and other types of mechanical movement are crucial to our industrial activities. Consequently, the health of these motors directly influences the operational reliability and longevity of the broader industrial ecosystem. Acknowledging this underscores the necessity for performing online health assessments of electric motors.

Optimización del rendimiento de los activos

El papel fundamental del análisis de la firma eléctrica (ESA) en la evaluación del estado de los activos de los sistemas de motores eléctricos

  • October 2024
  • Number of views: 121
Article

Las bombas, compresores, ventiladores y otros tipos de movimientos mecánicos son cruciales para nuestras actividades industriales. En consecuencia, la salud de estos motores influye directamente en la confiabilidad operativa y la longevidad del ecosistema industrial más amplio. Reconocer esto resalta la necesidad de evaluar la salud de los motores eléctricos en operación. 

Core Repair Tips To Reduce Core Loss

  • August 2024
  • Number of views: 1100
FREE for Members of EASA
Webinar recording

When a core loss test reveals localized hot spots, or visual inspection identifies physical damage, the ability to repair the damage in a cost-effective manner means the difference between repair or replacement.

Rewind 2024

  • July 2024
  • Number of views: 2759
Convention presentation

Revisit EASA's 2024 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 32 hours of training. Downloadable PDFs of slides and technical papers are included!

Cómo efectuar una "prueba de impacto" para resonancia

  • July 2024
  • Number of views: 1738
Article

Cuando la resonancia causa una vibración excesiva, es importante identificar la frecuencia natural y la forma modal de la vibración. Una simple prueba de impacto (bump test), realizada a máquina parada, es un buen primer paso para identificar la frecuencia natural.

How to Conduct a “Bump Test” for Resonance

  • July 2024
  • Number of views: 2229
Article

When resonance does cause excessive vibration, it is important to identify the natural frequency and the mode shape of the vibration. A simple bump test, conducted with the machine not running, is a good first step in identifying the natural frequency.

Examining the Causes of High Motor Current

  • April 2024
  • Number of views: 2317
FREE for Members of EASA
Webinar recording

Are you encountering high no-load current or high current with load? This presentation will look into the causes and cures.

Performing an Insulation Resistance Test

  • March 2023
  • Number of views: 7493
Video

This video explains how to check the ground insulation of an AC motor winding using the insulation resistance (IR) test.

Improve Customer Satisfaction: Follow Electric Motor Storage Procedures

  • January 2023
  • Number of views: 2518
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: 5385
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.

Open Stator Impedance Testing

  • November 2022
  • Number of views: 4294
FREE for Members of EASA
Webinar recording

The open stator impedance test (a.k.a, ball test or dummy rotor test) is used by many service centers as a quality control check before winding treatment and/or a troubleshooting test. This webinar recording reviews test procedures, expected outcomes and incorporating thermal camera imaging.

EASA Technical Manual

  • September 2022
  • Number of views: 28643
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.

Consider Rated Voltage and Frequency When Testing

  • July 2022
  • Number of views: 3884
Article

When possible, it is good practice to perform an uncoupled, no-load run on an induction motor as an incoming diagnostic test. A no-load run should also be performed after assembly, and ANSI/EASA AR100-2020 states that “no-load running tests should be made at rated voltage and rated frequency.” In this article, we’ll discuss some of the reasons why this is important and some things to consider when you cannot meet both requirements.

Cuando Haga Pruebas Considere la Tensión y Frecuencia Nominales

  • July 2022
  • Number of views: 4015
Article

Como forma de diagnóstico y cuando sea posible, una buena práctica consiste en probar en vacío un motor de inducción que entra al centro de servicios. Esta misma prueba también se debe efectuar después del ensamblaje y la norma ANSI/ EASA AR100-2020 establece que "las pruebas en vacío se deben realizar a la tensión y frecuencia nominales". En este artículo, discutiremos algunas de las razones por las que esto es importante y algunos factores a considerar cuando no se puede cumplir con ambos requisitos.

Working with Segmented Stator Cores

  • February 2022
  • Number of views: 8659
Article

Induction motor stator cores can be manufactured using single-piece laminations, however, for larger stators, or when minimizing scrap material, the stator laminations are segmented. While most service center repairs of machines with segmented stator laminations require no special attention, this article reviews a few scenarios that are important to be mindful of.

Trabajando con Estatores con Núcleos Segmentados

  • February 2022
  • Number of views: 6278
Article
Los núcleos de los motores de inducción se pueden fabricar con laminaciones de una sola pieza, sin embargo, para estatores muy grandes o cuando se minimiza el material de desecho, las laminaciones del estator son segmentadas.  Aunque la mayoría de las reparaciones en el centro de servicio de  las máquinas con estatores con laminaciones segmentadas no requieren atención especial, este artículo analiza algunos escenarios que es importante tener en cuenta.

High Potential Testing Motor Windings with Very Low Frequency

  • October 2021
  • Number of views: 10755
Article

High potential (hipot) testing procedures for motor and generator windings are usually performed with 50/60 Hz AC or DC as the power source. Hipot testing is a critical step in validating the quality of new windings. AC and DC hipot tests are also useful to understand the condition of aged insulation for machines in service. The disadvantage of the AC test at power frequency is when the size of the test set and/or complexity of the setup becomes problematic in motor repair and in the field. And the DC test stresses the end turns more. The very low frequency (VLF) test set has been successfully used to bridge the test gap between AC and DC hipot tests.

Prueba de Alto Potencial en Devanados Usando muy Baja Frecuencia

  • October 2021
  • Number of views: 6620
Article
 Los procedimientos de prueba de alto potencial (hipot) para devanados de motores y generadores generalmente se realizan con 50/60 Hz CA o CC como fuente de alimentación. La prueba de Hipot es un paso crítico para validar la calidad de los devanados nuevos. Las pruebas hipot de CA y CC también son útiles para comprender el estado del aislamiento envejecido de las máquinas en servicio. La desventaja de la prueba de CA a frecuencia industrial es cuando el tamaño del equipo de prueba y / o la complejidad de la configuración se vuelven problemáticos en la reparación del motor y en el campo. Y la prueba de CC enfatiza más los giros finales. El equipo de prueba de muy baja frecuencia (VLF) se ha utilizado con éxito para cerrar la brecha de prueba entre las pruebas hipot de CA y CC.

Rewind 2021

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

  • June 2021
  • Number of views: 11126
Convention presentation

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!

BUY A COPY

Considerations for Inrush vs. Locked Rotor Amps

  • June 2021
  • Number of views: 14682
Article

When an AC motor is initially energized at rated voltage (and frequency), the current drawn is many times rated current until the motor attains full operating speed. Consequences of starting current include short time overheating of stator windings and rotors, undesirable operation of overload protective devices and a sag in the supply voltage.

Consideraciones para los Amperios Inrush vs Rotor Bloqueado

  • June 2021
  • Number of views: 29639
Article

Cuando se energiza inicialmente un motor de CA a su voltaje nominal (y frecuencia), el motor toma varias veces la corriente nominal hasta que alcanza toda la velocidad de operación. Las consecuencias de la corriente de arranque incluyen: Breve sobrecalentamiento de los bobinados del estator y del rotor, disparos no deseados de los dispositivos de protección y caídas de voltaje en el suministro eléctrico.

Factors to Consider When Testing DC Armatures

  • May 2021
  • Number of views: 14572
Article

There are a lot of factors to take into consider when interpreting the bar-bar test or surge test. This articles reviews those factors.

Factores a Considerar al Probar Armaduras de CC

  • May 2021
  • Number of views: 13792
Article
Hay muchos factores a tener en cuenta al interpretar la prueba de barra-barra o la prueba de sobretensión. Este artículo revisa esos factores.

US Department of Energy Issues Final Rule for Testing Small Electric Motors

  • February 2021
  • Number of views: 9936
Article

The US Department of Energy (DOE) has issued rulemaking on test procedures for small electric motors for more than a decade. The present “final rule,” effective February 3, 2021, is the culmination of those efforts.

Rewind Study 2020: The Results Are In

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors

  • December 2020
  • Number of views: 11615
FREE for Members of EASA
Webinar recording

This webinar covers the results and the technical details of the recently completed follow-up to the 2003 EASA/AEMT Rewind Study.

ANSI/EASA Standard AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus

  • September 2020
  • Number of views: 70702
Booklet

ANSI/EASA AR100 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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Can Premium Efficient Motors Be Rewound without Degrading Efficiency?

  • June 2020
  • Number of views: 8020
FREE for Members of EASA
Convention presentation

In 2003, EASA and AEMT (Association of Electrical and Mechanical Trades in the UK) issued a report that proved rewinding motors in accordance with prescribed good practices would maintain efficiency and reliability. But in recent years, claims abounded that premium efficient motors could not be rewound without degrading efficiency. This recording discusses the latest EASA/AEMT research that included independent, third-party testing.

Controlling Stator Copper Losses in Formed Coil Rewinds

  • May 2020
  • Number of views: 11315
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.

How to Test and Assess Stator Core Condition Using a Loop Test

  • April 2020
  • Number of views: 19662
FREE for Members of EASA
Webinar recording

Is the motor drawing high no-load amps and winding data are correct? Are you experiencing unusual heating of the stator under load? Those common questions can be answered by checking the stator core condition.

Cómo Probar y Evaluar la Condición del Núcleo de un Estator con la Prueba de Lazo (“Toroide” o Loop Test)

En Español

  • April 2020
  • Number of views: 15259
FREE for Members of EASA
Webinar recording

¿El motor consume mucha corriente en vacío, aunque los datos del bobinado son correctos? ¿El motor se calienta con carga de forma inusual? Estas son preguntas comunes que pueden ser resueltas verificando la condición del núcleo del estator. En este webinario discutiremos cómo realizar la prueba de lazo en el núcleo de un estator y cómo analizar los resultados obtenidos, proporcionando información sobre los equipos utilizados, consejos para reparar el núcleo del estator y otras pruebas alternativas.