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Articles in Industry Publications

What’s New in NEMA MG 00001-2024 Besides the Title

  • June 2025
  • Number of views: 62
Article

The 2024 NEMA MG 00001 standard introduces key updates, including new Design BE and CE motors with defined locked-rotor current limits, Class N insulation for high-temperature use, and revised stall time requirements. It adds Super Premium efficiency levels aligned with IEC IE4, adopts IEC voltage/frequency variation guidelines, and expands duty ratings for variable load/speed motors.

Novedades en la NEMA MG 00001-2024 Además del Título

  • June 2025
  • Number of views: 43
Article

La norma NEMA MG 00001 2024 introduce actualizaciones clave, incluyendo nuevos motores de Diseño BE y CE con límites de corriente de rotor bloqueado definidos, aislamiento Clase N para uso a alta temperatura y requisitos revisados ​​de tiempo de pérdida. Añade niveles de eficiencia Super Premium alineados con IEC IE4, adopta las directrices IEC sobre variación de voltaje/frecuencia y amplía las capacidades de servicio para motores de carga/velocidad variable.

Performing a Single-Phase Rotor Test on an Assembled Three-Phase Induction Motor

  • May 2025
  • Number of views: 804
Video

The video provides a comprehensive guide on performing a single-phase rotor test on a three-phase squirrel cage motor to check for open rotor bars.

Rewind Tips For 2300-Volt, Random-Wound Motors

  • May 2025
  • Number of views: 614
Article

From the manufacturer’s perspective, a random-wound, 2300-volt motor represents a substantial reduction in manufacturing cost. For the service center, the challenge is to successfully rewind them while providing a reliable repair. Here are some techniques which will enhance your success rate.

Consejos para rebobinar motores de alambre redondo de 2300 Voltios

  • May 2025
  • Number of views: 432
Article

Desde la perspectiva del fabricante, un motor de 2300 voltios con bobinado aleatorio representa una reducción sustancial en el costo de fabricación. Para el centro de servicio, el reto es rebobinarlos con éxito y ofrecer una reparación confiable. Aquí hay algunas técnicas que mejorarán su tasa de éxito.

Taking Three-Phase Winding Data

  • April 2025
  • Number of views: 760
FREE for Members of EASA
Webinar recording

This presentation stresses the importance of taking accurate winding data and explains and emphasizes the consequences of inaccurate data. One of the main benefits of this presentation is to improve ability to “get it right the first time” to avoid the added cost and time of another rewind to correct errors.

AC Motor Verification & Redesign with Motor Stats

  • March 2025
  • Number of views: 1770
FREE for Members of EASA
Webinar recording

This webinar goes through some data verification and redesign examples using the Motor Stats view within EASA’s AC Motor Verification & Redesign software to learn what it tells us and what it doesn’t tell us about our data.

IEC to NEMA Motor Ratings

  • February 2025
  • Number of views: 1670
Article

The information in this article provides comparisons of key characteristics of IEC and NEMA motors to aid in evaluating the potential simplicity or complexity of the IEC to NEMA design conversion.

The Unique AC Motors of Log Stackers: Beyond Design D

  • February 2025
  • Number of views: 914
Article

This article delves into the AC motors responsible for the tilt and lift functions of the log stackers. These motors possess distinct characteristics, including a high-resistance rotor.

Los exclusivos motores de CA de las apiladoras de troncos: más allá del diseño D

  • February 2025
  • Number of views: 909
Article

En este artículo, se profundizará en los motores de CA responsables de las funciones de inclinación y elevación de las apiladoras de troncos. Estos motores poseen características distintivas, incluido un rotor de alta resistencia.

Clasificaciones IEC a NEMA

  • February 2025
  • Number of views: 1116
Article

La información de este artículo proporciona comparaciones de las características clave de los motores IEC y NEMA para ayudar a evaluar la posible simplicidad o complejidad de la conversión de diseño IEC a NEMA.

Lubricating an Open Ball Bearing During Assembly of an Induction Motor

  • January 2025
  • Number of views: 4499
Video

This video shows the proper way to lubricate the deep-groove, open ball bearing before assembling a horizontal induction motor.

Using an Induction Heater to Install Interference-Fit Bearings

  • January 2025
  • Number of views: 3373
Video

This video demonstrates the correct way to use an induction bearing heater to install an interference fit ball bearing on a machine shaft.

Getting the Most From the Phase Balance Test

  • December 2024
  • Number of views: 2598
Article

The phase balance test is a simple yet effective method for diagnosing some problems with existing windings and for inspecting new windings before resin treatment. Including thermography enhances diagnostic capabilities, making it a valuable addition to the testing process.

Obteniendo lo Máximo de la Prueba de Equilibrio de Fases

  • December 2024
  • Number of views: 1823
Article

La prueba de equilibrio de fases es un método simple y efectivo para diagnosticar algunos problemas en los devanados existentes y para inspeccionar devanados nuevos antes del tratamiento final. Incluir termografía mejora el diagnóstico, lo que es una adición valiosa para el proceso de prueba.

Submersible Pump Stator Oil Guidelines

  • November 2024
  • Number of views: 1985
Article

In addition to seal oil, some submersibles have an oil filled stator cavity. The oil in the stator cavity very efficiently transfers heat from the stator winding and core, and especially from the rotor, to the pump casing where convection carries it to the pumpage in which the pump is submerged. While the specifications for seal oil are fairly flexible, stator cavity oil has more constraints.

Pautas Para el Aceite del Estator de las Bombas Sumergibles

  • November 2024
  • Number of views: 1319
Article

Además del aceite de sellado, algunas bombas sumergibles tienen una cavidad del estator llena de aceite. Este aceite transfiere de manera muy eficiente el calor desde el devanado y el núcleo del estator, y especialmente desde el rotor, hasta la carcasa de la bomba, donde la convección lo lleva al líquido de bombeo en el que está sumergida. Si bien las especificaciones para el aceite de sellado son bastante flexibles, el aceite de la cavidad del estator tiene más restricciones.

Identifying Unmarked Leads of Three-Phase Motors

  • October 2024
  • Number of views: 3006
FREE for Members of EASA
Webinar recording

This presentation reviews procedures that explain how to identify unmarked leads of three-phase motors with one or two windings.

Core Repair Tips To Reduce Core Loss

  • August 2024
  • Number of views: 2908
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.

La Importancia de la Prueba de Impedancia del Estator

  • July 2024
  • Number of views: 1989
FREE for Members of EASA
Webinar recording

Este webinario incluye procedimientos de prueba, resultados esperados y el uso de cámaras termográficas para determinar posibles problemas en las conexiones o en las soldaduras.

Rewind 2024

  • July 2024
  • Number of views: 4447
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: 2821
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: 5599
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.

Using EASA’s Motor Rewind Data – Version 4

  • June 2024
  • Number of views: 3920
FREE for Members of EASA
Webinar recording

Learn how to effectively use EASA's live, ever-expanding online database of more than 250,000 windings.

Inverter Duty Three-Phase Motor Windings

  • June 2024
  • Number of views: 3754
Article

With the advent of solid-state electronic variable frequency drives (VFDs) in the late 1980s, it was found that the windings of motors used on VFDs failed more frequently than when powered by a utility (sine wave) supply. By the turn of the century, motor manufacturers had gained a better understanding of how VFDs affected motor windings. This article describes the materials and methods associated with inverter duty windings.

Devanados para motores trifásicos Inverter Duty

  • June 2024
  • Number of views: 4475
Article

Con la llegada de los variadores de frecuencia electrónicos (VFD) de estado sólido a fines de la década de 1980, se descubrió que los bobinados de los motores que funcionaban con VFDs fallaban con más frecuencia que al estar alimentados con la energía convencional (onda sinusoidal). A principios de siglo, los fabricantes de motores habían comprendido mejor cómo los VFD afectaban los devanados del motor, y al igual que los proveedores de materiales electro, aislantes habían desarrollado materiales y métodos para mejorar la confiabilidad de los devanados de los motores alimentados con VFDs. En este artículo, describiremos los materiales y métodos asociados con los devanados inverter duty.

Circulating Currents: Causes and Solutions

  • May 2024
  • Number of views: 3764
Article

This article explains in layman’s terms what electromechanical professionals refer to as circulating currents, why they exist in three-phase electric motors and to offer practical solutions. 

Corrientes Circulantes: Causas y Soluciones

  • May 2024
  • Number of views: 3049
Article

Este artículo es explicar en términos sencillos a qué se refieren los profesionales de la electromecánica como corrientes circulantes, por qué existen en los motores eléctricos trifásicos y ofrecer soluciones prácticas.

Examining the Causes of High Motor Current

  • April 2024
  • Number of views: 3713
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.

Choosing the Right Insulation System for Medium Voltage Rewinds

  • April 2024
  • Number of views: 4087
Article

The insulation system chosen for any rewind should be suitable for the application, the voltage class, and the winding process capability of the service center. In most cases, adherence to “equal to or better than” selection is a good practice.