Tom Bishop, P.E.
EASA Technical Support Specialist

Determining the source of noise in a motor is often much more challenging than correcting it. However, a methodical approach to investigating the noise can narrow down the possible causes and therefore make it easier to resolve the noise issue. There is a caveat. If the cause of the noise is due to something in the motor design, that is, a manufacturing defect or anomaly, a solution may not be possible or practical.

There are three primary sources of noise in a motor: magnetic, mechanical and windage. We will discuss the causes and characteristics of each and provide guidance in dealing with reducing or eliminating the noise associated with them.

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