for EASA members
A special discounted collection of 6 webinar recordings focusing on DC motor electrical procedures.
Once purchased, all 6 recordings will be available on your "Downloadable products purchased" page in your online account.
Downloadable recordings in this bundle include:
The Basics: Understanding DC Motor Tests
Presented October 2016
- Ampere turns of the armature, field and interpole data
- Determining the best armature coil pitch
- Verifying interpole circuits
- Importance of brush angle
- Equalizers and armature windings
Adjusting Brush Neutral
Presented June 2011
The webinar covers:
- How to set brush neutral in DC machines.
- Several methods of setting brush neutral along with the benefits and drawbacks of each.
- Tips for permanent magnet and series-would machines.
- Tips on how to recognize problems and settings that affect brush neutral, and what to check if the neutral adjustment seems higher than usual.
Target audience: This presentation is 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.
Carbon Brushes, Current Density and Performance
Presented June 2019
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.
This presentation covers:
- Importance of brush grade
- Effect of humidity and load (current)
- Best practice method for removing brushes to improve performance
- Brush pressure & spring tension by application
- Supplemental cooling of slip ring / brush enclosures
Target audience: This presentation will benefit service center technicians and supervisors.
Drop Testing of Fields and Synchronous Poles: Tips to Interpretation
Presented November 2011
This presentation covers:
- The basics of drop testing, as well as offers tips for interpreting the results.
- Both the AC and DC drop test are described as well as the advantages and drawbacks for each.
- For those cases where the drop test results are out of tolerance, this material will guide the technician in determining the reasons for the variation-how to recognize the difference between shorted coils and differences in iron, airgap or other influences.
- Rewind and assembly tips will also be discussed, where they influence the results of the drop test.
Target audience: This presentation is most useful for service center and field technicians with at least 5 years experience, service center managers, engineers, or anyone involved in DC motor or generator repair, as well as those who are simply looking to expand their knowledge.
Final Testing of DC Machines
Presented September 2011
To assure a quality repair, there specific tests (such as neutral-setting and interpole-armature polarity) that should routinely be performed on every DC machine. When done correctly, the simple procedures presented will prevent scenarios such as that late night phone call from an irate customer whose DC machine is "arcing like a fireworks show."
Target audience: Technicians with at least a moderate lever of experience in DC machine repair will benefit from this session.
Advanced DC Testing
Presented April 2012
This presentation shares tips that are not covered in “Fundamentals of DC: Operation and Repair Tips,” such as:
- Tips for interpreting armature and interpole tests
- Finding that ground in the newly rewound armature
- Interpreting questionable drop test results
It also covers final assembly tests including how to determine whether the cause of sparking is the interpoles or the armature.
Target audience: This presentation is aimed at the experienced technician and supervisor.
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