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Webinar Recordings

Introducing IEEE 2455: DC Repair Standard

IEEE Recommended Practice for the Repair and Maintenance of Direct Current Electric Machines

  • September 2025
  • Number of views: 2
Article

There is now a much-needed DC repair standard, created through the participation of EASA members and industry motor users.

Presentando la IEEE 2455: DC Repair Standard

IEEE Recommended Practice for the Repair and Maintenance of Direct Current Electric Machines

  • September 2025
  • Number of views: 2
Article

Existe ahora una norma para las reparaciones de CC muy necesaria, creada gracias a la participación de miembros de EASA y usuarios de motores de la industria.

How to Measure Magnet Wire

  • March 2023
  • Number of views: 4853
Video

This video shows one step in collecting motor winding data: how to measure magnet wire.

Factors to Consider When Testing DC Armatures

  • May 2021
  • Number of views: 17399
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: 16657
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.

DC Machine Data Sheet

  • December 2020
  • Number of views: 16827
Form/Worksheet

EASA's DC Machine Data Sheet provides all the fields necessary on a simple one-page form to accurately record all the details about the machine being repaired.

DC Motor Electrical Procedures

  • April 2020
  • Number of views: 13429
Webinar recording bundle

A special discounted collection of 6 webinar recordings focusing on DC motor electrical procedures.

Just $30 for EASA members!

Applying balance tolerances to various machine rotors

  • August 2017
  • Number of views: 11481
Article

The ISO balancing specification for rigid rotors (ISO 1940-1) was innovative when it was introduced decades ago. It established Balance Quality Grades based on the theoretical velocity the mass center of gravity of a rotor would encounter in free space, spinning at the rotor’s normal operating speed. That’s a mouthful of technical jargon, but a practical understanding of the nature of unbalance forces is important in applying balance tolerances to various machine rotors. It is also helpful in understanding the impact of fundamental changes in the recent replacement standard, 21940-11: 2016.

Aplicando las tolerancias de balanceo en rotores de diversas máquinas

  • August 2017
  • Number of views: 14125
Article

La especificación ISO para balancear rotores rígidos (ISO 1940-1) fue innovadora cuando fue introducida hace varias décadas. Esta norma estableció los Grados de Calidad de Balanceo basada en la velocidad teórica que el centro de masa de un rotor se encontraría en espacio libre, girando a la velocidad de funcionamiento normal del rotor. Esta es terminología técnica difícil de expresar, pero un entendimiento práctico de la naturaleza de las fuerzas de desbalanceo es importante para aplicar las tolerancias de balanceo en rotores de diversas máquinas. Esto también ayuda a entender el impacto de los cambios fundamentales en la reciente norma de reemplazo: 21940-11: 2016.

Power supply considerations when building a large growler

  • July 2017
  • Number of views: 14848
Article

When considering building a large growler for testing armatures and rotors, the initial decision typically is to select a kVA rating. A primary reason for this is that the growler will need to be connected to a power supply of sufficient ampacity at the supply voltage. To help simplify a complex design process, four kVA ratings have been selected for this article.