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How to schedule

To schedule private education for your group, contact:

Dale Shuter, CMP
Meetings & Expositions Manager
+1 314 993 2220, ext. 3335
dshuter@easa.com

1 hour of training

$300 for EASA Chapters/Regions
$400 for member companies
$800 for non-members

How a webinar works

All EASA private webinars are live events in which the audio and video are streamed to your computer over the Internet. Prior to the program, you will receive a web link to join the meeting. 

The presentation portion of the webinar will last about 45 minutes, followed by about 15 minutes of questions and answers.

Requirements

  • Internet connection
  • Computer with audio input (microphone) and audio output (speakers) appropriate for your size group
  • TV or projector/screen

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The Zoom webinar service EASA uses will ask to install a small plugin. Your computer must be configured to allow this in order to have full functionality. Please check with your IT department or company's security policy prior to scheduling a private webinar.

Private Webinars

EASA's private webinars are an inexpensive way to bring an EASA engineer into your service center, place of business or group meeting without incurring travel expenses or lost production time.

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Convention presentation

AC Motor Redesign

  • June 2012
  • Number of views: 3106
  • Article rating:

Chuck Yung
EASA Senior Technical Support Specialist

Redesigning electric motors has become commonplace for motor repair service centers. By changing one or more motor characteristics, service centers often can adapt motors to meet new requirements faster and more economically than they can obtain new ones.

This paper explains how to make any changes in the ratings of AC electric motors that are possible within design limitations. Examples of each redesign are included as a guide for making your own redesigns. Besides mathematical formulas, this section provides guidelines on the limitations for each type of redesign. These guidelines will also help you determine whether a desired new rating is possible before you strip a motor.

In most service centers, there are rules regarding what winding changes can be made, who can make them, and who must approve them. Make sure that redesigns are not made without going through the proper channels.

This paper gives a brief review of AC motor theory and operation that includes flux pattern, types of losses, NEMA design designations and test procedures. It also covers:

  • Design considerations for slip-ring and synchronous motors
  • Requirements for reduced starting voltage
  • Formulas for redesigning polyphase and single-phase AC equipment.

Available Downloads



ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 3: Rewinding

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 5: Basic Motor Theory

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 5: Basic Motor Theory

Tags: Motor design
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