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Webinar Recordings

Cleaning Commutator and Slip Ring Surfaces with a Brush

  • April 2025
  • Number of views: 122
Article

When there is a need for cleaning the contact surfaces of commutators and slip rings with brushes, emery cloth with aluminum oxide is NOT recommended, as conductive abrasive particles will cause arcing and damage to the surface. Many times, stone cleaning, garnet paper and machining are not a convenient, sufficient, or cost-effective option for machines as the priority is to keep the downtime to a minimum. This is when the carbon brush can be designed to clean up the contact surface.

Seating Carbon Brushes on a DC Machine

  • January 2025
  • Number of views: 1679
Video

This video shows the proper procedure for seating carbon brushes in a DC machine.

Testing Interpole Polarity on a DC Machine

  • January 2025
  • Number of views: 2167
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.

Brush Stagger to Optimize Brush Life Through Current Density

  • January 2025
  • Number of views: 1690
Article

When working with DC machines, it’s not uncommon to find a customer who runs different products requiring a range of armature current. Unlike other conductors, where lower current is a good thing, carbon brushes are designed for a narrow range of current density. A unique aspect of carbon brush life is that brushes operating at a much lower current density than they are designed for do not last nearly as long as expected.

Desalineamiento de escobillas para optimizar su Vida útil através de la Densidad de Corriente

  • January 2025
  • Number of views: 1091
Article

Al trabajar con máquinas de CC, no es raro encontrar un cliente que fabrica diferentes productos que requieren un rango de corriente de armadura. A diferencia de otros conductores, donde una corriente más baja es algo bueno, las escobillas de carbón están diseñadas con poco margen de densidad de corriente.

Procedures for Refinishing Commutators and Slip Rings in Place

  • September 2023
  • Number of views: 3279
Article

General guidance for performing brush seating or comutator reprofiling in the field.

Procedimientos para rectificar in situ colectores y anillos rozantes

  • September 2023
  • Number of views: 2694
Article

Orientación general para realizar el ajuste del asiento de las escobillas o del conmutador en el campo.

How to Set Brush Neutral on a DC Machine

  • March 2023
  • Number of views: 6594
Video

This video shows how to adjust the brush neutral position of a DC machine to prevent sparking at the brushes at full load.

Turn and Undercut of DC Commutators

  • August 2022
  • Number of views: 4133
FREE for Members of EASA
Webinar recording

This webinar discusses specific procedures to obtain the best possible results when machining & undercutting commutators for DC machines.

DC Machine Inspection Report

  • August 2016
  • Number of views: 18416
Form/Worksheet

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