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EASA's private webinars

Displaying 1 - 10 of 40 private webinars available

Adjusting Brush Neutral

This session will demonstrate how to set brush neutral in DC machines. Several methods, with the benefits and drawbacks of each, will be explained. This webinar includes tips for permanent magnet and series-wound machines. Included will be tips on how to recognize problems and settings that affect brush neutral, and what to check if the neutral adjustment seems higher than usual.

Who should attend
This seminar will be most useful for service center and field technicians involved in the repair of DC machinery, service center managers, engineers, or anyone involved in DC motor or generator repair, as well as those who are simply looking to expand their understanding.
Topic(s): DC

Advanced DC Testing

This webinar will share tips that are not covered in "Fundamentals of DC: Operation and Repair Tips", such as:

  1. Tips for interpreting armature and interpole tests
  2. Finding that ground in the newly rewound armature
  3. Interpreting questionable drop test results

It will also cover final assembly tests including how to determine whether the cause of sparking is the interpoles or the armature.

Who should attend

This webinar is aimed at the experienced technician and supervisor.


Topic(s): DC

Balance Quality Requirements of Rigid Rotor—Applying ISO 1940/1

When is a machine rotor or armature balanced “good enough” and how does that relate to how smoothly the machine runs? How much a machine will vibrate (or how smoothly it will run) depends on quite a number of variables besides balance.

This webinar will provide valuable and practical information on this topic. Additionally, it will cover balance quality grades and how to determine if a rotor meets the appropriate grade as well as some of the factors that affect the final vibration level.


Topic(s): Balancing

Basics of Machinery Foundations and Bases

A faulty machine foundation or base can lead to excessive vibration and premature failure. This webinar will explain the fundamentals of machinery foundation construction and how to identify and trouble shoot machine base problems, including basic vibration techniques and ODS analysis.


Topic(s): AC, DC, Alignment, Mechanical, Vibration

Bearing Analysis and Failure Modes

This webinar will identify and define these failure modes:

  • True and false brinelling
  • Spalling
  • Fluting (bearing current)
  • Cage damage
  • Fretting
  • Loss of fits
  • Lubrication problems
  • Shields and seals
  • Skidding
  • Preload
  • Internal clearance
  • Load zone and ball track
  • Key indicators: temperature, noise, vibration

Topic(s): Bearings, Root cause failure analysis

Belt Loads

This session will address the impact of overhung loads on bearing life. Critical factors include belted horsepower, belt tension, sheave sizes and sheave location. The use of ball bearings versus roller bearings will be considered as well as the factors that affect that decision. Not all belted loads should be roller bearings! Methods to calculate the bearing load and maximize life of the bearings will be shown.

Who should attend

The webinar will be most useful for service center and field technicians, service center managers, and engineers with a need to understand how overhung loads can lead to catastrophic bearing failure.


Topic(s): Bearings, Mechanical

Concentric or Lap? Considerations for the 2-Pole Stator Rewind

Two-pole motors present special rewind issues, especially when converting them from concentric to lap windings. The pitch is especially important as certain coil pitches will cause harmonics that have a negative impact on performance. Optimum pitches are often very difficult to wind and shorter pitches result in sacrificed conductor area. This webinar will explore sample redesigns and present some guidelines to assist in deciding between the concentric and lap winding.

Who should attend
This webinar will be most useful for service center winders, engineers, supervisors and managers. The content will be beneficial for beginners through highly experienced persons.
Topic(s): AC, Repair tips/procedures, Theory & design

DC Theory

This webinar describes, in practical terms, how a DC motor works. Working with basic principles of attraction-repulsion and magnets, the operation of a DC machine is explained without mathematical formulas. Some of the principles to be explained include:

  • the role of interpoles
  • armature coil pitch
  • the interaction of fields and armatures to create rotational torque
  • interpole polarity
  • brush neutral
  • compound-wound fields
Who should attend

Those involved in electric motor repair, from entry level to 30+ years of experience, will benefit from attending this session. Hands-on technicians, supervisors and sales personnel, as well as those who use DC machines, will learn from this webinar.


Topic(s): DC

Dealing with Shaft and Bearing Currents

This session will address key issues related to shaft and bearing currents in electric motors and generators. Critical topics that will be covered include recognizing symptoms of shaft and bearing currents, and determining if damaging current levels are present. Also, possible causes of the damaging current, such as machine dissymmetry and operation on variable frequency drives (VFDs) will be dealt with. Methods of testing to confirm the presence of shaft or bearing currents will be described, as well as how to assess the magnitude of the damaging currents. Further, solutions to eliminate or control shaft and bearing currents, such as insulators, isolators, and ceramic bearings, will be offered.

Who should attend

This seminar will be most useful for service center and field technicians with at least 5 years experience, service center managers, engineers, or anyone with previous experience dealing with shaft and bearing current issues looking to expand their knowledge.


Topic(s): Bearings, Root cause failure analysis, Shafts

Drilling Down Into DC Design

This one-hour webinar will focus on:

  • How to use basic design rules to verify data for fields, interpoles and armatures
  • Verifying the correct armature coil pitch
  • Special cases where you can improve on the original armature design
  • What to do when the armature was received stripped, and the manufacturer no longer exists

Topic(s): DC, Theory & design

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