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Cool facts about cooling electric motors

Improvements in applications that fall outside the normal operating conditions

  • November 2015
  • Number of views: 109
  • Article rating: No rating
Trade press article — IEEE Industry Applications

The evolution of electric motor design as it pertains to cooling methods provides insights about better ways to cool machines in service. The array of methods engineers have devised to solve the same problems are fascinating yet reassuring because many things remain unchanged even after a century of progress. This article discusses how motors are cooled and how heat dissipation can be improved for applications that fall outside the normal operating conditions defined by the National Electrical Manufacturers Association (NEMA) Standard MG 1.

Service factor: What is it and what does it do?

  • August 2015
  • Number of views: 127
  • Article rating: No rating
Article

There are many misconceptions about Service Factor (SF) in the industry. Some feel it is meant for temporary excursions into overload conditions; others consider it to be an allowance for permanent overload. The truth is that it is neither. 

Cool advice on hot motors

  • August 2015
  • Number of views: 119
  • Article rating: No rating
Trade press article — Maintenance Technology

The effects of excessive temperature on motor performance are notorious. After moisture, they are the greatest contributor to bearing and winding failures. Understanding the source of increased temperature is key to correcting the problem and improving the reliability of your facility’s motor fleet.

Motor Winding Temperature and Detectors to Measure It

  • October 2013
  • Number of views: 63
  • Article rating: No rating
Webinar recording
  • This presentation begins with an overview of ambient, winding temperature rise, and winding temperature.
  • It also covers factors for motor temperature rise limits such as motor size (medium or large), insulation class rating, service factor and the enclosure.
  • The final part of the presentation addresses detectors for measuring winding temperature, namely thermostats, resistance temperature detectors (RTDs), thermocouples and thermistors.

How to Balance Overhung Fans

  • October 2011
  • Number of views: 119
  • Article rating: No rating
Webinar recording
  • Often an overhung fan is balanced in a single plane, only to find that the vibration has shifted to the outboard bearing.
  • Attempts to use standard two-plane techniques may result in calculated correction weights that are very large and produce poor results.
  • There are more effective ways to approach this common problem.
  • This presentation shows a methodical approach and techniques for tackling this difficult balancing problem.
  • This presentation is intended for field service balancing technicians, supervisors and managers.

Cool facts about cooling electric motors

Whether old or new design, lowering temperatures based on same principles

  • July 2011
  • Number of views: 85
  • Article rating: No rating
Article

Whether an old or new design, lowering temperatures is based on the same principles. I've often commented on how fortunate we are to work on such a variety of electric motor designs. One day, you are working on a new design some designer has recently created, and the next day you are repairing a motor that could be in a museum. It's fascinating to see the different ways engineers have devised to do the same thing, and yet reassuring to see how many things remain unchanged even after a century of electric motors. One aspect of electric motors that could be placed in both categories is the way an electric motor is cooled. This article takes a look at how motors are cooled and how we can improve cooling for some of the special applications we encounter.

Fan law knowledge can help performance

  • October 2002
  • Number of views: 70
  • Article rating: No rating
Article

Most of us involved in the repair of electrical equipment have a good understanding of how an electric motor works — especially the stator and rotor. But the fan can appear deceptively simple. Fans are pretty interesting, once we learn a few "affinity laws" — rules that also apply to blowers and impellers. This article will review some basic facts about fans that explain how small changes to a fan can make a BIG difference.

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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