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Technical Notes

Acoustic Noise
Audible or acoustic sound is defined as the frequency spectrum that is audible to the human ear.

A frequency converter or a drive uses frequencies in the audible spectrum to control the motor.

As the motor converts these electrical signals to mechanical motion, the conversion replicates the process, which occurs in loud speakers. Fortunately, a motor acts as a very poor loud speaker, but a substantial part of the electrical signals are still converted into audible noise.

The most sensitive area of frequencies to the human ear is typical around 4 kHz and sound or noise in that range will often be regarded as the most annoying.

Sound or noise is for the most part transmitted through the air, but can under certain circumstances also be transmitted through mechanical constructions, such as duct fixtures, duct walls or building construction elements. 

For further information please contact your local Danfoss Company