ANSI/EASA AR100-2020 cover

ANSI/EASA Standard AR100-2020
ANSI/EASA AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus is a must-have guide to the repair of rotating electrical machines. It establishes recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

Questions?

For information about ANSI/EASA AR100 or questions about the work on this standard, contact:

Mike Howell, PE
EASA Technical Support Specialist
+1 314 993 2220
mhowell@easa.com

ANSI Accredited Standards Developer Information

Considerations for using VFDs with standard motors

There are areas of concern when trying to control both speed and cost

June 2019
Number of views: 9175
Article rating: .0

Mike Howell
EASA Technical Support Specialist

End users desiring speed and/or torque control often buy variable-frequency drives (VFDs) to modify existing applications where a standard induction motor is in place. Frequently, they try to control costs by using that existing standard induction motor. Before taking that path, however, it is best to consider a few areas of concern with the approach.

Topics covered in this article include:

Speed-torque characteristics
Shaft currents
Installation

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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 5: Electronics
Section 8: Bearings

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)

Section 4: Safety & Handling Considerations
Section 7: Stators
Section 10: Bearings & Lubrication

Principles of Medium & Large AC Motors (IEC Standards)

Section 4: Safety & Handling Considerations
Section 7: Stators
Section 10: Bearings & Lubrication

Root Cause Failure Analysis

Section 2: Bearing Failures
Section 3: Stator Failures

Mechanical Repair Fundamentals of Electric Motors

Section 2: Motor Applications & Enclosures
Section 5: Bearings
Section 13: Shaft/Bearing Currents

Fundamentals of Pump Repair

Section 2: General Pump Repair Procedures
Section 8: Pump Reliability

Categories: Articles in industry publications, Plant Engineering

Tags: Variable frequency drives

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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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EASA Good Practice Guide

Good Practice Guide to Maintain Motor Efficiency
Based on the 2019 and 2003 Rewind Studies of premium efficiency, energy efficient, IE2 (formerly EF1) and IE3 motors

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