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Webinar recording bundle

Working with AC Windings

  • April 2020
  • Number of views: 12012
  • Article rating: 4.0
for EASA members


A special discounted collection of 12 webinar recordings focusing on AC motor windings.

Once purchased, all 12 recordings will be available on your "Downloadable products purchased" page in your online account.

Downloadable recordings in this bundle include:

The Basics: Taking Motor Data
Presented September 2016

This presentation covers:

  • Photo documentation
  • Paper documentation
  • Measurements
  • Winding data: turns, wire size, connection, core dimensions
  • Keeping cause of failure questions in mind

Taking Three-Phase Winding Data
Presented October 2012

This presentation stresses the importance of taking accurate winding data and explains and emphasizes the consequences of inaccurate data. Details are provided on how to take accurate electrical and mechanical data as well as how to verify the data is correct. It gives you and improved ability to "get it right the first time" so as to avoid the added cost and time of another rewind to correct errors.

The Basics: Motor Connections
Presented November 2016

This webinar covers:

  • Internal connections
  • Connections in the outlet box
  • Connections in the MCC Ladder diagrams

Tips and Techniques for Winders
Presented August 2015

This webinar covers:

  • Procedural tips for coil insertion
  • Creating slot room where there is none
  • Faster, easier separators
  • Lacing technique to prevent phase paper pull-out
  • Interspersed coil winding made simple
  • Better braze joints

Rewinding Tips for Premium Efficient Motors
Presented June 2016

This webinar recording covers: 

  • Importance of core loss testing
  • Methods to reduce core losses
  • Slot fill improvement without reducing copper

Windings & Connections
Presented December 2015

This webinar recording focuses on the internal connections of AC motors, including:

  • Wye or delta?
  • Parallel circuits
  • Dual voltage - delta connected, wye connected and wye/delta connected
  • Tri-voltage - 2D2Y1D and others

Concentric or Lap? Considerations for the 2-Pole Stator Rewind
Presented September 2014

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 presentation explores sample redesigns and present some guidelines to assist in deciding between the concentric and lap winding.

Target audience: 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.

Stator Rewinds: When Things Get Tight
Presented June 2015

When preparing to rewind random or form wound stators, sometimes there just doesn’t seem to be enough room in the stator slot for the desired conductor area and insulation quantities. Common scenarios encountered are redesigns from concentric to lap, changes to higher voltages or aggressive designs from the OEM.

This webinar will look at balancing stator copper losses against insulation reliability.

Ensuring Success With VPI
Presented June 2014

Global vacuum pressure impregnation is the most common insulation system processing method utilized for form wound stators today. A successful VPI depends on several variables including materials, methods and maintenance. This recording will provide information to assist the service center with ensuring success with form wound VPI projects.

Target audience: This recording will be most useful for service center winders, engineers, supervisors and managers. The content will be beneficial for beginners through highly-experienced persons.

Induction Motor Rotor Windings: Squirrel-Cage and Wonld Rotor Basics
Presented January 2018

This presentation covers the following topics:

  • Induction motor basics for operation
  • Squirrel-cage
    • Conductor material
    • Deep-bar effect
    • Multiple-cage windings
    • Phase resistance
    • IEC/NEMA design letters
    • Speed-torque characteristics
  • Wound-rotor
    • Winding construction
    • Wave-wound connections
    • Distribution factor and chord factor
    • Rotor phase voltage
    • Speed-torque characteristics

Target audience: This webinar will benefit service center technicians and supervisors. 

2-Speed, 2-Winding Pole Group Connections
Presented September 2018

The topics covered included in this webinar recording:

  • One circuit wye connection — Best, no parallel paths, turns per coil may prevent this
  • Delta or multiple parallel circuits—Produces closed circuits, Circulating currents
  • Open delta (4 wire connection)
  • Permissible connections—Skip pole, adjacent pole
  • Determined by speed combination

T​arget audience: This webinar recording will benefit service center technicians and supervisors.

Minimizing Risk With High-Voltage Rewinds
Presented February 2014

This webinar presents a product quality planning process for industrial motor stator windings rated above 4 kV. Emphasis is placed on analyzing gaps between these projects and lower voltage rewinds as they relate to:

  • Stator winding design
  • Insulation system validation
  • Process control

Target audience: This presentation is most useful for service center winders, engineers, supervisors and managers. The content targets beginners through highly experienced persons.



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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 May 2024
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.