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Trade press article — Maintenance Technology

Cool advice on hot motors

  • August 2015
  • Number of views: 12117
  • Article rating: No rating

By Jim Bryan
EASA Technical Support Specialist (retired)

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.

Topics in this article cover:

  • Overload and service factor
  • Ventilation
  • Voltage variation
  • Electrical steel
  • Current density
  • Circulating currents
  • Harmonics

READ THE ARTICLE



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 3: DC Machines

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards
  • Section 12: Test & Inspection Procedures

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 5: Basic Motor Theory
  • Section 6: Motor Standards
  • Section 12: Test & Inspection Procedures

Root Cause Failure Analysis
  • Section 3: Stator Failures
  • Section 7: DC Motor Failures
  • Section 8: Synchronous Machine Failures

Fundamentals of DC Motors & Operation Tips
  • Section 8: Ventilation & Accessories
  • Section 10: On-Site Troubleshooting

Related articles

Tags: Motor load Ventilation Cooling Circulating currents Harmonics Voltage variation
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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.

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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

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ANSI/EASA AR100-2020

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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.

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EASA Technical Manual

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Revised May 2024
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.

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