for EASA members
A special discounted collection of 11 webinar recordings focusing on electromechanical theory and application.
Once purchased, all 11 recordings will be available on your "Downloadable products purchased" page in your online account.
Downloadable recordings in this bundle include:
Minimizing Calibration Costs
Presented February 2016
This presentation covers :
- Quantities/qualities of measuring and test equipment utilized in the industry
- How to locate/source qualified calibration suppliers
- Costs of internal / external calibration for some measuring and test equipment
Drilling Down Into DC Design
Presented May 2013
This presentation focuses 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
DC Theory and Design 101
Presented February 2017
This webinar covers:
- Attraction / repulsion explanation as magnets
- Ampere-turns of armature, fields, interpoles
- Determining the correct interpole circuits
- Evaluation of armature designs
- How to recognize opportunities for improvement
Target audience: Supervisors, winders and those desiring to learn more about DC machines.
DC Brush Neutral: What It Means and Interpreting Results
Presented April 2018
This presentation 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
Wire Size Changes 101: Tools and Methods for Avoiding Costly Mistakes with the Most Common Redesign
Presented June 2018
This webinar focuses on:
- Proper wire measurements
- Metric and AWG sizing
- Aluminum to copper
- Random to form wound and vice versa
- Stator windings, field windings, interpoles
- Using wire combination tables
- Using EASA’s AC Motor Verification & Redesign software
Target audience: This webinar will benefit service center technicians and supervisors.
Motor Winding Temperature and Detectors to Measure It
Presented October 2013
This presentation begins with an overview of ambient, winding temperature rise, and winding temperature. It also covers factors for motor temperature rise limits such as motor size (medium or large), insulation class rating, service factor and the enclosure. The final part of the presentation addresses detectors for measuring winding temperature, namely thermostats, resistance temperature detectors (RTDs), thermocouples and thermistors.
Target audience: This presentation is most useful for service center winders, engineers, supervisors and managers. The content will be beneficial for beginners through highly-experienced persons.
Winding & Bearing Sensing Devices
Presented May 2014
This presentation addresses the topic of a various temperature sensing devices including RTDs, thermostats, thermocouples and thermistors. The advantages of each and the proper application will be covered.
Target audience: This presentation will be most useful for service center sales personnel, engineers, supervisors and managers. The content will be beneficial for moderate through highly-experienced persons.
Insulation Material Properties & Testing: How the Insulation System Works
Presented April 2016
This webinar recording covers:
- Insulation system versus insulation materials
- Stresses imposed on insulation systems
- Insulation system components / functions
- Typical testing of system components / functions
Insulation Testing of Motors and Generators
Presented June 2017
This webinar covers:
- Types of tests: Insulation resistance, Polarization index, High potential, Surge, Partial discharge test
- Testing of machines: Motors (AC and DC), Generators (AC and DC)
Target audience: This webinar will be most useful for service center supervisors, electromechanical technicians, winders and field service personnel.
Handling Partial Discharge Issues
Presented January 2013
This presentation covers:
- An explanation of partial discharge
- Description of the damage mechanism
- PWM drive and partial discharge
- How to evaluate partial discharge
- Repair tips for dealing with partial discharge
Reclosure: How It Happens and What To Do About It
Presented February 2015
Reclosure occurs when power to a motor is briefly interrupted and restored before the magnetic field has fully collapsed in the motor’s winding. If this occurs while the applied power is out of phase with the collapsing field, significant damage can result. This webinar will address how this can happen and what measures can mitigate damage potential.
Topics covered include:
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- Reclosing a switch or breaker before the magnetic field collapses
- Utilities’ automatic reclosure
- Contactor “chatter”
- Determining the time constraint
- Remedies: Time delay; Zero crossing