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Using Carbon Brush Face as an Effective Diagnostic Tool

  • October 2022
  • Number of views: 1063
  • Article rating: 5.0

The worn carbon brush face indicates the operating conditions. Therefore, it can be utilized by brush experts as a highly effective diagnostic tool for troubleshooting and determination of root causes. If these warning signs shown at the brush face can be identified and proactively addressed in a timely manner, then major unexpected expensive catastrophic failures like flashover or repair of the contact surface can be avoided.

Usando las Caras de las Escobillas como Herramienta de Diagnóstico Efectiva

  • October 2022
  • Number of views: 912
  • Article rating: No rating

DC Motor Electrical Procedures

  • April 2020
  • Number of views: 8554
  • Article rating: 3.0
Webinar recording bundle

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

Just $30 for EASA members!

Carbon Brushes, Current Density and Performance

  • June 2019
  • Number of views: 6051
  • Article rating: No rating
Webinar recording

The lowly brush is underrated and misunderstood. The brush grade, brush pressure and spring tension, as well as the effect of load and humidity are each important to brush performance in DC machines, wound rotor motors, and synchronous machines.

DC Brush Neutral: What It Means and Interpreting Results

  • April 2018
  • Number of views: 5466
  • Article rating: No rating
Webinar recording

This webinar covers:

  • How much voltage output is too much?
  • What can cause higher than desired output voltage?
  • Brush spacing, brush seating, field or interpole spacing & polarity
  • Interpole circuits

DC Machine Inspection Report

  • August 2016
  • Number of views: 12622
  • Article rating: 4.6

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

Carbon Brushes and Commutation: A Practical Approach to Failure Analysis

  • June 2013
  • Number of views: 5153
  • Article rating: 5.0
Convention presentation

Ever run across brush arcing or vexing commutation issues? This paper, presented at the 2013 EASA Convention, provides a approach to analyzing brush and commutation problems and failures.

Flashover: Causes and cures for damage to brushholders, commutators

  • April 2013
  • Number of views: 19353
  • Article rating: 3.6

There are times when a DC motor or generator experiences a catastrophic failure and the customer wants to know why it happened. One type of failure that seems to stimulate lively conversation is when the failure involves dramatic damage to the brushholders and commutator. The term "flashover" describes the appearance of the failure; the very name conveys an accurate mental image of the failure. The questions that arise next are predictable: "What caused this?" and "What can be done to prevent a recurrence?" Or, if the motor was recently repaired: "What did you do to my motor to cause this?!" The purpose of this article is to help you answer those questions.

Adjusting Brush Neutral

  • June 2011
  • Number of views: 4353
  • Article rating: 3.0
Webinar recording

This presentation demonstrates how to set brush neutral in DC machines, describing several methods along with the benefits and drawbacks of each.

A case of uneven brush wear

  • October 1998
  • Number of views: 7960
  • Article rating: 4.0

The brushes on a 4-pole, 700 hp DC motor were not wearing at the same rate. In this case, rapid brush wear occurred on two adjacent brush rows - one positive and one negative polarity. The other brushes had minimal wear. Electrical tests found no winding faults, and the air supply was clean. Most of us suspect low current-density when rapid brush wear occurs. A lightly loaded DC motor can "dust" a set of brushes in short order. Changing the brush grade (or removing some of the brushes) will usually solve the problem.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.


ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.



EASA Technical Manual

EASA Technical Manual cover

Revised September 2022
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.