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Learning from experience: Tips for repairing a "purpose-built" motor

  • December 2018
  • Number of views: 724
  • Article rating: No rating
Article

I suspect that just about everyone in our industry at one time or another has had the joy of repairing a “purpose-built” motor. This kind of motor is built for a specific purpose and has characteristics that may allow it to operate under non-standard conditions. Due to the limited information that some of them display on the nameplate, the repair of these motors can be somewhat of a challenge. Sometimes these motors possess differences such as the color of paint, the shaft size, the bearing size, or type. It can be the operating temperature and at times it can be the motor in its entirety. Following are a few useful tips we use when repairing a motor with so many question marks.

Motor maintenance trends: 6 factors to evaluate

Recent EASA research studies provide new insights on repair vs. replace to help motors reliably drive machinery, pumps, conveyors, and other vital industrial equipment

  • June 2018
  • Number of views: 984
  • Article rating: No rating
Trade press article — Plant Engineering

When faced with an ailing or failed motor, plant operators typically consider whether to repair or replace it. According to a 2014 study conducted by Plant Engineering magazine for the Electrical Apparatus and Service Association (EASA), just more than one-half of plants have a policy of automatically replacing failed electric motors below a certain horsepower rating. While that horsepower rating varied depending upon the plant’s installed motor population, the average rating was 30 hp.

While such policies address a portion of the motors used at most plants, they do not cover what occurs with those motors. That question was addressed in a more recent research project commissioned by EASA that focused on the disposition of electric motors considered for repair.

Marketing ANSI/EASA AR100 = TRUST

  • May 2016
  • Number of views: 267
  • Article rating: No rating
Article

Before getting underway with this marketing discussion, you may be asking: Why should I even care about the Recommended Practice for the Repair of Rotating Electrical Apparatus (ANSI/ EASA AR100-2015)? Actually, that’s a good question! This article will tell you why you should care.

How to ensure effective motor repair and rewind

Speak the same language as your service center when it comes to setting performance expectations

  • May 2016
  • Number of views: 687
  • Article rating: No rating
Trade press article — Plant Services

Electric motor efficiency can be maintained during repair and rewind by following defined good practices. This article builds on a previous discussion of PM and PdM for three-phase squirrel-cage motors ("PM and PdM for electric motors") by outlining some of the expectations and good practices for repairs of these types of motors.

ANSI/EASA AR100: What's in the new 2015 edition?

  • November 2015
  • Number of views: 734
  • Article rating: No rating
Article

EASA’s Recommended Practice for the Repair of Rotating Electrical Apparatus, designated as ANSI/EASA AR100, was first approved as an American National standard in 1998. Since then, it has been revised and approved four more times: 2001, 2006, 2010 and 2015. This article discribes the most recent changes.

¿Qué es lo nuevo en la edición 2015 de la Norma ANSI/EASA AR 100?

  • November 2015
  • Number of views: 762
  • Article rating: No rating
Article

La Práctica Recomendada para la Reparación de Máquinas Eléctricas Rotativas de EASA, denominada ANSI/EASA AR100, fue aprobada por primera vez como norma nacional estadounidense en 1998. A partir de esta fecha, ha sido revisada y aprobada en cuatro ocasiones más: 2001, 2006, 2010 y ahora en 2015. Una descripción resumida del proceso de revisión y aprobación de la AR100 es la siguiente: El Comité de Servicios Técnicos de EASA (TSC) revisa la Práctica Recomendada y propone cambios; a continuación un grupo de estudio aprueba y realiza comentarios a las propuestas realizadas por el TSC. El grupo de estudio está conformado por representantes de centros de servicio, del gobierno, de laboratorios de prueba, usuarios finales y por aquellos que tengan un interés general en el tema. Por requisito de ANSI, en el grupo de estudio debe existir una participación balanceada (equitativa) de los representantes de cada sector. Después que el grupo de estudio y el TSC alcanzan un acuerdo unánime, el documento revisado se envía a la junta directiva de EASA para su aprobación. Una vez aprobado por la junta, se solicita a ANSI que apruebe la revisión como Norma Nacional Estadounidense. El proceso completo debe realizarse dentro de los cinco años siguientes a la revisión anterior. La edición 2015 de la AR100, contiene cerca de 100 revisiones de la versión previa. En www.easa.com se encuentra disponible una versión PDF de la AR100, que incluye los cambios resaltados. Este artículo se centrará en explicar los cambios más significativos, en orden de apartado y de aclarar algunas de las razones para realizarlos. Así mismo, también explica los efectos causados por estos cambios en el Programa de Certificación de EASA. 1.12 Autorización para la Entrega (nuevo apartado): Se agregó una recomendación que indica que debe haber una autorización para poder hacer la entrega de una máquina una vez esta se ha reparado, ej. “Conforme para entregar u OK final.” Se considera como buena práctica, que exista alguien que certifique la reparación “con una firma”, indicando que la máquina ya se encuentra reparada y puede regresar a las instalaciones del cliente. La Lista de Verificación del Programa de Certificación de EASA ya incluye este paso como requisito. 2.6 Balanceo o Equilibrado: El nivel de calidad del balanceo o equilibrado dinámico de las máquinas que funcionan a más de 2500 rpm cambió a G1.0; las máquinas que giran por debajo de las 2500 rpm conservan el grado de calidad G2.5. Este cambio refleja la tendencia en la industria, tanto en los centros de servicio como en los usuarios finales, de realizar balanceos o equilibrados dinámicos más precisos, de las partes rotativas que giran a las velocidades más altas. Este cambio afectará a los centros de servicio que ya han sido certificados por EASA y a aquellos que estén considerando certificarse. Efectivo a partir de Agosto de 2016, el nivel de equilibrado G1.0 para máquinas que funcionan a más de 2500 rpm, formará parte de los requisitos del Programa de Certificación de EASA. 2.7 Anillos Rozantes: Se ha agregado una tolerancia específica para el acabado superficial de los anillos rozantes. Esta medida se encuentra entre 40 y 60 micro-pulgadas (1.02 a 1.52 micrones). La directriz previa era algo subjetiva, refiriéndose a que el acabado de la superficie de los anillos rozantes debía ser suave y pulido. 2.8.1 Mecanizado (de colectores): Se ha añadido una tolerancia específica para el acabado de las superficies de los colectores. Esta medida se encuentra entre 40 y 60 micro-pulgadas (1.02 a 1.52 micrones). Al igual que en los anillos rozantes, la directriz anterior era un tant

Mechanical repairs play a key role in motor repair and reliability

EASA AR100 details steps to take to clean, repair, and test equipment

  • November 2015
  • Number of views: 589
  • Article rating: No rating
Trade press article — Plant Engineering

In a previous article in Plant Engineering ("A systematic approach to AC motor repair," Plant Engineering, April 2015), EASA highlighted the good practices for electrical repair found in ANSI/EASA Standard AR100 Recommended Practice for the Repair of Rotating Electrical Apparatus, and the significant impact they can have on motor efficiency and reliability. But that was only part of the story, because mechanical repairs—and even documentation, cleaning, and inspection—can also markedly affect motor reliability and efficiency.

ANSI/EASA Standard AR100-2015: Recommended Practice for the Repair of Rotating Electrical Apparatus

  • August 2015
  • Number of views: 4629
  • Article rating: 4.3
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.

The importance of stator core loss testing before and after burn-off process

  • June 2014
  • Number of views: 1080
  • Article rating: 2.0
Article

By this time we should all know that stator core loss testing is a required part of a quality rewind. A core loss test before and after burn-off is specified in the EASA Recommended Practice for the Repair of Rotating Electrical Apparatus (ANSI/EASA AR100) and The Effect of Repair/Rewinding on Motor Efficiency; EASA/AEMT Rewind Study and Good Practice Guide to Maintain Motor Efficiency.

Topics covered in this article include:

  • Lessons learned
  • Rebates add incentive
  • Learning from other members
  • Determining if the core is usable
  • Accurate iron measurements

Enhance Your Market Position Using EASA's Recommended Practices

  • March 2013
  • Number of views: 170
  • Article rating: No rating
Webinar recording

Do customers and prospects view your company as just another EASA repair facility? Not sure? The most successful EASA members have learned to position their businesses in a way that is not like all others.

How do they achieve this uniqueness? It’s not through fancy marketing, websites or slick-talking salespeople. Rather, it is a business strategy that provides superior service by demonstrating adherence to EASA’s recommended practices. Note: This is not a technical session. It is a strategic marketing session that illustrates how your company can enhance customer value.

Some of the EASA standards addressed include:

  • ANSI/EASA AR100-2010: Recommended Practice for the Repair of Rotating Electrical Apparatus
  • Root Cause Failure Analysis
  • The Effect of Repair/Rewinding on Motor Efficiency: EASA/AEMT Rewind Study and Good Practice Guide to Maintain Efficiency

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

EASA Technical Manual cover

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 AR100-2015

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.

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DESCARGAR - ESPAÑOL

EASA AR200

EASA AR200: Guide for the Repair of Power and Distribution Transformers cover

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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