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Considerations for random to form winding conversions

  • December 2019
  • Number of views: 749
  • Article rating: No rating
Article

With a steady increase in random wound AC motor sizes and the obvious superiority of the form coil winding, one area where we can help improve customers' motor reliability is by redesigning those large random wound motors to accept form coils. Most repairers would agree that machines rated larger than 600 hp (450 kW) should be designed as form coil machines. Likewise, those rated over 2 kV will be much more reliable as form coil machines.

No one wants to rewind a motor using 60 #14 AWG (62- 1.6 mm) wires in hand. With an abundance of niche suppliers of stator laminations, the cost and practicality of converting a random wound motor to form coil are available to nearly all service centers. Replacement laminations can be punched, laser-cut or water-cut, and supplied with very reasonable delivery times.

Conexiones Externas en los Motores Eléctricos Trifásicos

En Español

  • November 2019
  • Number of views: 1622
  • Article rating: 5.0
Webinar recording

La conexión incorrecta de los motores eléctricos es una causa frecuente de fallo y es más común de lo que parece. La falta de información y la mala interpretación de los datos de placa son algunas de sus causas. En este webinario se explican los diferentes tipos de conexiones para los motores eléctricos trifásicos de una o varias velocidades con al menos 6 cables de salida y se comparan las equivalencias NEMA e IEC para el marcado de cables. La información proporcionada también será de gran utilidad para evitar el conexionado incorrecto en los diferentes voltajes. También incluye las conexiones por devanado partido (Part Winding) y como interpretar la información de la conexión de la placa de datos.

Almacenamiento a largo plazo: Algunos puntos a tener en cuenta

  • February 2019
  • Number of views: 541
  • Article rating: No rating
Article

Es bien conocido por aquellos que trabajan con el almacenamiento de motores eléctricos que las filosofías y procedimientos de mantenimiento varían. La revisión minuciosa de la información de EASA y siete fabricantes de motores diferentes sobre el almacenamiento de motores reveló algunas diferencias y similitudes interesantes en la información disponible en cada una de las fuentes consultadas.

Varias fuentes comparten elementos comunes como el ambiente, la protección contra humedad, el mantenimiento de los rodamientos y la resistencia de aislamiento. Aquí, la finalidad de nuestro debate es describir algunas de las diferencias y ojalá dar a conocer algunos puntos a tener en cuenta cuando se crea un procedimiento de almacenamiento a largo plazo para los usuarios finales.

Los programas AC Motor Verification and Redesign y Motor Rewind Data Version 4 trabajan en conjunto para ofrecer más funciones

  • February 2019
  • Number of views: 626
  • Article rating: 1.0
Article

Las nuevas funciones del programa AC Motor Verification and Redesign – Version 4 (ACRewind) de EASA mejoran la capacidad de los miembros de EASA para enviar datos originales de forma electrónica e incluirlos en la base de datos Motor Rewind Data – Version 4 (MotorDB).

AC Motor Verification and Redesign and Motor Rewind Data Version 4 programs work together to offer more capabilities

  • February 2019
  • Number of views: 669
  • Article rating: No rating
Article

The Version 4 software is a powerful set of tools for members to check the validity of winding data and to redesign windings from concentric-to-lap and for changes in motor performance. A key feature of this latest version of the program is the integration of the MotorDB with the ACRewind program. The availability of both program functions within a common user interface provides more than just convenience. The ability of the programs to share data resources creates new capabilities that the stand-alone version of the program could not.

Parallel circuits: More than meets the eye

  • December 2018
  • Number of views: 826
  • Article rating: No rating
Article

There are benefits and drawbacks to the use of multiple circuits in a 3-phase winding. Whether discussing a random winding or form coil winding, some of the considerations are shared. Topics covered include:

  • Increasing circuits, turns
  • Rotor pullover during starting
  • Increased risks
  • Factors beyond our control

Working with odd-turn (unequal-turn) windings

  • July 2018
  • Number of views: 922
  • Article rating: No rating
Article

Manufacturers almost always utilize machine-inserted concentric windings for random-wound, three-phase stators when their processes can facilitate it due to lower manufacturing costs. Many service centers can produce concentric windings too, but the most common practice is to utilize the two-layer lap winding. For form-wound stators, the two-layer lap winding is almost always used by manufacturers and service centers alike. The purpose of this article is to provide some tips for working with odd-turn (unequal-turn) windings, or two-layer windings where the total number of turns per slot is an odd number (e.g., 3,5,7,9…n). In such cases, the top and bottom coil sides must have a different number of turns.

How To Wind Three-Phase Stators (Version 2)

Self-paced, interactive training for stators 600 volts or less

  • February 2017
  • Number of views: 694
  • Article rating: No rating
Software

This EASA software is a valuable interactive training tool ideal for training your novice(s) ... and even experienced winders will learn from it. The CD teaches how to wind in a richly detailed, step-by-step approach which includes narrative, animations and video clips, with tests to assess student comprehension. 

Methods for three-phase winding data verification

  • February 2017
  • Number of views: 652
  • Article rating: 3.0
Article

One of the main objectives in rewinding is to maintain the original performance characteristics of the machine. Our focus with this article will be on three-phase motor stator windings. If it is known that the winding in the motor was original and there is certainty that the as-found data is correct, the original winding can be duplicated with confidence by using the as-found data. However, in some cases there is uncertainty that the as-found winding had original factory data. In those cases, extra steps need to be taken as described here. 

Métodos para verificar los datos de un bobinado trifásico

  • February 2017
  • Number of views: 371
  • Article rating: No rating
Article

Uno de los principales objetivos del rebobinado es poder conservar las características de funcionamiento originales de la máquina. Nuestro artículo estará enfocado en los bobinados de los estatores de motores trifásicos. Si se sabe que el devanado del motor era original y estamos seguros que los datos que hemos tomado son correctos, el bobinado original se puede duplicar con confianza utilizando estos datos. Sin embargo, en ciertas ocasiones, no existe la certeza que los datos que hemos tomado correspondan al bobinado original de fábrica. En estos casos, es necesario tomar medidas adicionales como las aquí descritas. 

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
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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 AR100-2015

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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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