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Resource Library

Webinar recording bundle

AC Electric Motor Design

  • April 2020
  • Number of views: 6457
  • Article rating: 4.0
for EASA members


A special discounted collection of 6 webinar recordings focusing on AC electric motor design.

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: AC Motor Design
Presented July 2016

This webinar recording covers: 

  • Various types of AC motors and bases for operation
  • Squirrel cage induction motor rotor design / construction
  • Squirrel cage induction motor stator design / construction

How Winding Changes Affect Motor Performance
Presented January 2019

This webinar recording focuses on the effect of three-phase stator winding changes on efficiency and reliability.

Specific changes addressed will include:

  • Connection
  • Circuits
  • Turns
  • Span/pitch
  • Grouping sequence
  • Concentric to lap, and vice versa
  • Wire area per turn and per slot

Target audience: Service center technicians and supervisors.

Motor Starting Capabilities and Considerations
Presented March 2014

This webinar addresses the topic of a three phase squirrel cage motor’s ability to successfully accelerate a driven load. Although a motor can drive a running load, that is not assurance that it has the capability to accelerate the load up to rated speed. The difference between success and failure is determined by some complex conditions. For example, the motor torque during starting is not constant, and unless the load is a pure inertia load (very rare), it does not have a constant speed-torque relationship. Key considerations addressed include acceleration time, acceleration torque, motor heating, stator and rotor limits, and torque variables.

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.

AC Motor Redesign: Speed Changes
Presented January 2015

This presentation focuses on AC motor redesigns involving speed changes. Service centers encounter scenarios such as the procurement of a single-speed motor that must be redesigned for two speeds or redesign of an existing two-speed motor for use on an adjustable-speed drive.

Topics covered include:

  • Single-speed, one-winding to two-speed, one-winding
  • Single-speed, one-winding to two-speed, two-winding
  • Two-speed, two-winding to single-speed, one-winding
  • Two-speed, one-winding to single-speed, one-winding

The redesign examples are performed using EASA’s AC Motor Verification & Redesign program, including use of the integrated motor winding database for locating comparative data. Examples will include other changes such as voltage, frequency and horsepower.

Magnetic Wedges
Presented January 2019

An increasing number of manufacturers are using magnetic wedges in their form-wound machines. When a winder fails to replace magnetic wedges in kind, the winding temperature rise can increase by 20°C, and the magnetizing current can increase by 20% or more.

This recording explains why they are used, provides a balanced review of the benefits and negative issues associated with their use, and explains how to avoid the problems.

  • Why some manufacturers use magnetic wedges
  • Benefits of magnetic wedges
  • Downside of magnetic wedges
  • Fitting and installation to prevent them from falling out in service

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

Speed/Torque Curves
Presented March 2017

This recording covers:

  • Starting torque
  • Breakdown torque
  • Full load torque
  • Speed current curve
  • Load torque curve
  • Impact of reduced voltage start (autotransformer, PWS, wye-delta)
  • Slot combination problems (noise, torque cusp, cogging)

It is very important to understand speed/torque curves and how they impact motor operation.

Target audience: Engineers, mechanics, winders and sales persons with fundamental knowledge of motor operation. 



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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 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.