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Webinar Recordings

Testing Interpole Polarity on a DC Machine

  • January 2025
  • Number of views: 318
Video

This video will walk you through how to check the relative polarity of DC machine interpoles and the armature and correct it if necessary using a simple interpole polarity test.

Interpoles and Compensating Windings in DC Machines – What Do They Do?

  • December 2023
  • Number of views: 3781
Article

Unlike their AC counterparts, DC machines do not have rotating magnetic fields. Rather, there are fixed magnetic field axes for the field (direct axis) and armature (quadrature axis). Even though the armature is rotating, the magnetic field axis in the armature is fixed thanks to commutation, which allows the direction of current in an armature conductor to change as it passes from the region under one main field pole to the next.

Interpolos y Devanados de Compensación - ¿Qué es lo que hacen?

  • December 2023
  • Number of views: 2299
Article

A diferencia de sus homólogos de CA, las máquinas de CC no tienen campos magnéticos rotativos. Más bien, existen ejes de campo magnético fijos para el campo (eje directo) y la armadura (eje en cuadratura). Aunque la armadura esté girando, el eje del campo magnético de la armadura está fijo gracias a la conmutación, lo que permite que la dirección de la corriente en un conductor de la armadura cambie a medida que pasa debajo de un polo de campo principal al siguiente.

How to Measure Magnet Wire

  • March 2023
  • Number of views: 3539
Video

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

Mitigating Risk with Insulation Systems

  • September 2021
  • Number of views: 12867
Article

Relevant standards including IEC 60085 and IEEE 1 have similar definitions for electrical insulating materials (EIM) and electrical insulation systems (EIS). As with any system, there is an interaction between the materials used, and the insulation system developers take great care to ensure that this interaction does not lead to undesirable outcomes.

Mitigando El Riesgo En Los Sistemas De Aislamiento

  • September 2021
  • Number of views: 11805
Article

Diferentes normas relevantes incluyendo la IEC 60085 y la IEEE 1 definen de forma similar los materiales electro aislantes (EIM) y los sistemas de aislamiento eléctrico (EIS). Como en cualquier sistema, existe una interacción entre los materiales usados y los diseñadores de los sistemas de aislamiento cuidan todos los detalles para evitar que esta interacción produzca resultados indeseados.

DC Machine Data Sheet

  • December 2020
  • Number of views: 14582
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: 11766
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: 17843
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: 12944
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.