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Trade press article — Plant Services

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: 41038
  • Article rating:

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

READ THE FULL 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 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

Tags: Noise
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