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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

Zoom logo

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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Article

Speed-torque characteristics of three-phase motors

  • December 2005
  • Number of views: 1513
  • Article rating:

Tom Bishop, P.E.
EASA Technical Support Specialist 

The speed-torque characteristics of three-phase motors are an important consideration when selecting a replace­ment. If an incorrect design type is chosen for the new motor, the motor may not start the load, or the motor may draw excessive starting current and consequently trip overload protective devices. When it comes to repair, at times a squirrel cage rotor is determined to have an open circuit and will need to be rebarred. 

It is the rotor bar and end ring material and physical shape that have the greatest effect on starting as well as running performance. Simply put, the rotor design determines motor Association) standards fall into four major categories, or design types. These are identified on the motor nameplate as design A, B, C and the less common D. There was a design E designation that NEMA withdrew a few years ago. What are the differ­ences between the design types? We will define the starting characteristics and examine these different designs. Note: IEC (International Electro-technical Commission) motors do not have design type designations. 

Available Downloads



ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 4: Testing

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines
  • Section 7: Electrical Testing

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 8: Squirrel Cage Rotors
  • Section 12: Test & Inspection Procedures

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 8: Squirrel Cage Rotors
  • Section 12: Test & Inspection Procedures

Tags: Motor design
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