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Induction Motor Rotor Windings: Squirrel-Cage and Wound Rotor Basics for the Technician

  • January 2018
  • Number of views: 55
  • Article rating: No rating
Webinar recording

This webinar 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

Stator Core Testing: Know What You Have Before You Wind It

  • April 2017
  • Number of views: 49
  • Article rating: No rating
Webinar recording

This webinar covers:

  • The importance of the stator core test 
  • Simple theory to share with technicians and customers 
  • Practical approach for testing small stators demonstrated 
  • Eliminating pen + paper; loop test calculations for any device 
  • Assessing the results

Common recommendations for stored motors

  • September 2013
  • Number of views: 45
  • Article rating: No rating
Article

When an electric motor is expected to be stored for an appreciable time before it is placed into service, certain steps should be taken to ensure that it will be suitable for operation when it is needed. The practical limitation we need to recognize is that much of what we do when putting a motor into long-term storage has to be undone when the same motor is moved into operation. This article addresses common recommendations for stored motors.

Benefits of the AC hi-pot for new form coil stator windings

  • August 2013
  • Number of views: 58
  • Article rating: No rating
Article

The October 2012 Currents article titled "How to properly test AC stator and wound rotor windings" provides a thorough explanation on the proper application of insulation resistance, winding resistance, surge testing and high potential testing for stators and wound rotors. The article emphasizes that NEMA MG 1-2011 specifies AC and DC high potential (hi-pot) test levels for new windings and does not recommend repeated application of the high potential test. This is reinforced in EASA's Recommended Practice for the Repair of Rotating Electrical Apparatus (ANSI/EASA AR100-2010) which calls for reduced voltage levels for repeated tests should they be required. This article is intended to provide additional information on the high potential test performed on new windings. Specifically, it addresses the advantages of AC high potential testing for new, form coil stator windings. Topics discussed include: A real-world example Destructive test? Sizing the AC test set Example calculation Bibliographic references to additional reference materials

Cold stripping procedures for form coil machines

  • April 2009
  • Number of views: 53
  • Article rating: No rating
Article

There are times when a winding cannot be processed through the burnout oven, so it must be removed "cold." The bond strength of most resins is approximately 8-10 psi (55-70 kPa), which means that a fairly large coil might have nearly 3,000 pounds (1350 kg) of bonding force with the slot. In those cases, there are some useful tips that can be used to reduce the difficulty in removing the coils. Many of the techniques in this article can be adapted for open-slot, wound rotors and armatures.

Form coil rewind tips for motors 6 kV and above

  • February 2006
  • Number of views: 61
  • Article rating: No rating
Article

When rewinding motors rated 6 kV and above, there are certain steps beyond the normal rewind procedures used for 2.3 kV/4 kV machines. Whether a machine is to be VPI processed makes a difference in how the winding should be treated.

Two variations of form-wound coils

  • July 2001
  • Number of views: 51
  • Article rating: No rating
Article

It is very important to take accurate data when you rewind a form-wound motor or generator, especially if the coils will be made by an outside coil manufacturer. There are a couple of variations to the standard coil design that are not common, but that you may come across from time to time.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides a great marketing tool for your service center! Use it to provide end users with information that will help them obtain 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

LEARN MORE AND DOWNLOAD MÁS INFORMACIÓN Y DESCARGAR

READ MORE ABOUT THE FEATURES AND BENEFITS

EASA Technical Manual

EASA Technical Manual cover

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.

VIEW & DOWNLOAD

ANSI/EASA AR100-2015

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.

DOWNLOAD - ENGLISH

DESCARGAR - ESPAÑOL

EASA AR200

EASA AR200: Guide for the Repair of Power and Distribution Transformers cover

Guide for the Repair of Power and Distribution Transformers
This document establishes guidelines for each step of the repair of power transformers, describing record keeping, tests, analysis, and general guidelines for the repair of power transformers.

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