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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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

Electric Motor Noise: How to Identify the Cause and Implement a Solution

A methodical approach can narrow down which of the primary sources is to blame: magnetic, mechanical or windage noise

May 2021
Number of views: 25483
Article rating: 3.5

Tom Bishop, P.E.
EASA Senior Technical Support Specialist

Determining the source of noise in an electric motor is often more challenging than correcting it. A methodical investigative approach, however, can narrow the possibilities and make it easier to resolve the issue—with one caveat. If the noise is due to something in the motor design (e.g., a manufacturing defect or anomaly), a solution may be impossible or impractical. With that in mind, let’s review the primary sources of noise in electric motors—magnetic, mechanical, and windage—as well as their causes and ways to reduce or eliminate them.

Areas examined in this article include:

Magnetic noise
- Slip noise
- Skewing
- Unequal air gap
Mechanical noise
- Loose stator core
- Bearings
- Airborne noise
Windage noise

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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 7: Electrical Testing
Section 8: Bearings
Section 9: Lubrication
Section 10: Mechanical

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)

Section 2: Motor Enclosures
Section 3: Typical Motor Applications
Section 4: Safety & Handling Considerations
Section 5: Basic Motor Theory
Section 6: Motor Standards
Section 8: Squirrel Cage Rotors
Section 12: Test & Inspection Procedures
Section 13: Motor Alignment, Vibration & Noise
Section 15: Synchronous Machines

Principles of Medium & Large AC Motors (IEC Standards)

Section 2: Motor Enclosures
Section 3: Typical Motor Applications
Section 4: Safety & Handling Considerations
Section 5: Basic Motor Theory
Section 6: Motor Standards
Section 8: Squirrel Cage Rotors
Section 10: Bearings & Lubrication
Section 12: Test & Inspection Procedures
Section 13: Motor Alignment, Vibration & Noise
Section 15: Synchronous Machines

Root Cause Failure Analysis

Section 1: Root Cause Methodology
Section 2: Bearing Failures
Section 3: Stator Failures
Section 4: Shaft Failures
Section 5: Rotor Failures
Section 6: Mechanical Failures
Section 10: Case Studies

Fundamentals of DC Motors & Operation Tips

Section 6: Commutators
Section 8: Ventilation & Accessories
Section 9: Motor Assembly & Final Testing
Section 11: Failure Analysis

Mechanical Repair Fundamentals of Electric Motors

Section 2: Motor Applications & Enclosures
Section 7: Shafts
Section 8: Rotors
Section 9: Motor Assembly
Section 11: Motor Dynamics
Section 12: Vibration & Motor Geometry
Section 13: Shaft/Bearing Currents
Section 15: Failures in Mechanical Components
Section 16: Miscellaneous Repairs

Fundamentals of Pump Repair

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

Categories: AC motors, Stators/windings, Bearings, Miscellaneous, Troubleshooting & failure analysis, Articles in industry publications, Plant Services

Tags: Noise

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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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