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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.

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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

Pitfalls of applying generally accepted coupling manufacturers' alignment tolerances

  • February 2005
  • Number of views: 6857
  • Article rating: No rating

Ken Gralow
Gray Electric Co.
Schenectady, New York
Technical Education Committee Member

Shaft couplings are devices that connect two rotating shafts together. They efficiently transfer motion and power from the drive unit to the driven unit without adversely impacting either piece of rotating equipment. Under ideal conditions, both shafts should function as a continuous unit.

The design of a flexible coupling is to accommodate small amounts of shaft misalignment. Coupling manufacturers have designed their couplings to withstand the forces resulting from excessive shaft misalignment. Unfortunately, shaft alignment tolerances have sometimes been governed by the coupling manufacturers’design speecifications. These are maximum values that are dimensionally possible for a specific coupling. The coupling misalignment tolerances reported by coupling manufacturers apply ONLY to the coupling.

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EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 10: Mechanical

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 13: Motor Alignment, Vibration & Noise

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 13: Motor Alignment, Vibration & Noise

Mechanical Repair Fundamentals of Electric Motors
  • Section 5: Bearings
  • Section 12: Vibration & Motor Geometry

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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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