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Webinar Recordings

DC Machine Data Sheet

  • December 2020
  • Number of views: 1141
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: 685
Webinar recording bundle

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

Just $30 for EASA members!

DC Machine Inspection Report

  • August 2016
  • Number of views: 1636
Form/Worksheet

A convenient incoming inspection report for basic DC motor conditions and test values.

DC Machine As-Received Connection Form (2-, 4- and 6-Pole DC Machines)

  • August 2016
  • Number of views: 606
Form/Worksheet

This inspection report helps record a DC motor's connection as it enters the service center. It is intended for use with 2-, 4- and 6-pole DC machines.

What’s new in the IEEE 43 insulation resistance testing standard?

  • April 2016
  • Number of views: 3311
Article

The Institute of Electrical and Electronics Engineers (IEEE) standard for insulation resistance testing of motor and generator windings that was published in 2002 has been revised. The 2013 edition was published in March 2014. This article examines the changes to the standard.

¿Qué hay de nuevo en la norma para pruebas de resistencia de aislamiento IEEE 43?

  • April 2016
  • Number of views: 3929
Article

La norma para realizar las pruebas de resistencia de aislamiento en los devanados de motores y generadores del Instituto de Ingenieros Eléctricos y Electrónicos (IEEE), publicada en el 2002 ha sido revisada. La edición del 2013 fue publicada en Marzo del 2014. Este artículo examina los cambios al estándar.

Keeping it cool: A look at causes of motor overheating

  • March 2015
  • Number of views: 1117
Article

We know that excessive temperature and moisture are the largest contributors to bearing and winding failures. Understanding the source of the increased temperature will help us to correct the problem and improve the machine’s life expectancy.

Considerations when working with compound wound DC fields

  • December 2014
  • Number of views: 819
Article

Occasionally a customer wants a spare DC machine, and you find a replacement that is almost – but not quite – identical. Often, either the original or the spare is compound wound. The customer then asks: “What do the series fields do?” and “Can we just isolate the series leads?”  There are a couple of considerations, but the answer is that “it depends.”

DC shunt field rewinding wire size considerations

  • January 2014
  • Number of views: 916
Article

When rewinding the shunt fields of a DC machine, it is important to avoid making changes that could negatively impact performance. The recommended practice is to maintain the manufacturer’s winding configuration during the repair. That is, the field circuit connection, turns per coil, mean or average length of turn (MLT) and wire size should not be changed. However, service centers do sometimes encounter issues around wire size availability. The purpose of this article is to provide some guidance for making wire size substitutions when the original size is unavailable.

Aluminum-to-copper magnet wire winding conversions: Considerations for deciding whether wire area should be reduced

  • December 2011
  • Number of views: 2264
Article

Although aluminum magnet wire theoretically can be converted to copper magnet wire of about 5/8 of the original wire area, in some cases this is not advisable. In others, it may result in a change in the magnetic strength of a coil or winding. In this article we will address the most common aluminum-to-copper magnet wire conversions as well as how to deal with whether the wire area should be reduced. Topics discussed include:

  • AC motor windings
  • Shunt fields
  • Series fields and interpoles
  • Transformer windings